//! Gitlore CLI entry point.

use clap::Parser;
use console::style;
use dialoguer::{Confirm, Input};
use serde::Serialize;
use tracing_subscriber::EnvFilter;
use tracing_subscriber::layer::SubscriberExt;
use tracing_subscriber::util::SubscriberInitExt;

use lore::Config;
use lore::cli::commands::{
    IngestDisplay, InitInputs, InitOptions, InitResult, ListFilters, MrListFilters,
    SearchCliFilters, SyncOptions, open_issue_in_browser, open_mr_in_browser, print_count,
    print_count_json, print_doctor_results, print_embed, print_embed_json, print_event_count,
    print_event_count_json, print_generate_docs, print_generate_docs_json, print_ingest_summary,
    print_ingest_summary_json, print_list_issues, print_list_issues_json, print_list_mrs,
    print_list_mrs_json, print_search_results, print_search_results_json, print_show_issue,
    print_show_issue_json, print_show_mr, print_show_mr_json, print_stats, print_stats_json,
    print_sync, print_sync_json, print_sync_status, print_sync_status_json, run_auth_test,
    run_count, run_count_events, run_doctor, run_embed, run_generate_docs, run_ingest, run_init,
    run_list_issues, run_list_mrs, run_search, run_show_issue, run_show_mr, run_stats, run_sync,
    run_sync_status,
};
use lore::cli::{
    Cli, Commands, CountArgs, EmbedArgs, GenerateDocsArgs, IngestArgs, IssuesArgs, MrsArgs,
    SearchArgs, StatsArgs, SyncArgs,
};
use lore::core::db::{
    LATEST_SCHEMA_VERSION, create_connection, get_schema_version, run_migrations,
};
use lore::core::error::{LoreError, RobotErrorOutput};
use lore::core::paths::get_config_path;
use lore::core::paths::get_db_path;

#[tokio::main]
async fn main() {
    // Reset SIGPIPE to default behavior so piping (e.g. `lore issues | head`) doesn't panic
    #[cfg(unix)]
    unsafe {
        libc::signal(libc::SIGPIPE, libc::SIG_DFL);
    }

    // Initialize logging with progress-bar-aware writer.
    // SuspendingWriter suspends the shared MultiProgress before each log line,
    // preventing log output from interleaving with progress bar animations.
    tracing_subscriber::registry()
        .with(
            tracing_subscriber::fmt::layer()
                .with_target(false)
                .with_writer(lore::cli::progress::SuspendingWriter),
        )
        .with(
            EnvFilter::from_default_env()
                .add_directive("lore=info".parse().unwrap())
                .add_directive("warn".parse().unwrap()),
        )
        .init();

    let cli = Cli::parse();
    let robot_mode = cli.is_robot_mode();

    // Apply color settings (console crate handles NO_COLOR/CLICOLOR natively in "auto" mode)
    match cli.color.as_str() {
        "never" => console::set_colors_enabled(false),
        "always" => console::set_colors_enabled(true),
        "auto" => {} // console crate handles this natively
        _ => unreachable!(),
    }

    let quiet = cli.quiet;

    let result = match cli.command {
        Commands::Issues(args) => handle_issues(cli.config.as_deref(), args, robot_mode),
        Commands::Mrs(args) => handle_mrs(cli.config.as_deref(), args, robot_mode),
        Commands::Search(args) => handle_search(cli.config.as_deref(), args, robot_mode).await,
        Commands::Stats(args) => handle_stats(cli.config.as_deref(), args, robot_mode).await,
        Commands::Embed(args) => handle_embed(cli.config.as_deref(), args, robot_mode).await,
        Commands::Sync(args) => handle_sync_cmd(cli.config.as_deref(), args, robot_mode).await,
        Commands::Ingest(args) => {
            handle_ingest(cli.config.as_deref(), args, robot_mode, quiet).await
        }
        Commands::Count(args) => handle_count(cli.config.as_deref(), args, robot_mode).await,
        Commands::Status => handle_sync_status_cmd(cli.config.as_deref(), robot_mode).await,
        Commands::Auth => handle_auth_test(cli.config.as_deref(), robot_mode).await,
        Commands::Doctor => handle_doctor(cli.config.as_deref(), robot_mode).await,
        Commands::Version => handle_version(robot_mode),
        Commands::Completions { shell } => handle_completions(&shell),
        Commands::Init {
            force,
            non_interactive,
            gitlab_url,
            token_env_var,
            projects,
        } => {
            handle_init(
                cli.config.as_deref(),
                force,
                non_interactive,
                robot_mode,
                gitlab_url,
                token_env_var,
                projects,
            )
            .await
        }
        Commands::GenerateDocs(args) => {
            handle_generate_docs(cli.config.as_deref(), args, robot_mode).await
        }
        Commands::Backup => handle_backup(robot_mode),
        Commands::Reset { yes: _ } => handle_reset(robot_mode),
        Commands::Migrate => handle_migrate(cli.config.as_deref(), robot_mode).await,
        Commands::Health => handle_health(cli.config.as_deref(), robot_mode).await,
        Commands::RobotDocs => handle_robot_docs(robot_mode),

        // --- Backward-compat: deprecated aliases ---
        Commands::List {
            entity,
            limit,
            project,
            state,
            author,
            assignee,
            label,
            milestone,
            since,
            due_before,
            has_due_date,
            sort,
            order,
            open,
            draft,
            no_draft,
            reviewer,
            target_branch,
            source_branch,
        } => {
            if !robot_mode {
                eprintln!(
                    "{}",
                    style("warning: 'lore list' is deprecated, use 'lore issues' or 'lore mrs'")
                        .yellow()
                );
            }
            handle_list_compat(
                cli.config.as_deref(),
                &entity,
                limit,
                project.as_deref(),
                state.as_deref(),
                author.as_deref(),
                assignee.as_deref(),
                label.as_deref(),
                milestone.as_deref(),
                since.as_deref(),
                due_before.as_deref(),
                has_due_date,
                &sort,
                &order,
                open,
                robot_mode,
                draft,
                no_draft,
                reviewer.as_deref(),
                target_branch.as_deref(),
                source_branch.as_deref(),
            )
            .await
        }
        Commands::Show {
            entity,
            iid,
            project,
        } => {
            if !robot_mode {
                eprintln!(
                    "{}",
                    style(format!(
                        "warning: 'lore show' is deprecated, use 'lore {}s {}'",
                        entity, iid
                    ))
                    .yellow()
                );
            }
            handle_show_compat(
                cli.config.as_deref(),
                &entity,
                iid,
                project.as_deref(),
                robot_mode,
            )
            .await
        }
        Commands::AuthTest => {
            if !robot_mode {
                eprintln!(
                    "{}",
                    style("warning: 'lore auth-test' is deprecated, use 'lore auth'").yellow()
                );
            }
            handle_auth_test(cli.config.as_deref(), robot_mode).await
        }
        Commands::SyncStatus => {
            if !robot_mode {
                eprintln!(
                    "{}",
                    style("warning: 'lore sync-status' is deprecated, use 'lore status'").yellow()
                );
            }
            handle_sync_status_cmd(cli.config.as_deref(), robot_mode).await
        }
    };

    if let Err(e) = result {
        handle_error(e, robot_mode);
    }
}

/// Fallback error output for non-LoreError errors in robot mode.
#[derive(Serialize)]
struct FallbackErrorOutput {
    error: FallbackError,
}

#[derive(Serialize)]
struct FallbackError {
    code: String,
    message: String,
}

fn handle_error(e: Box<dyn std::error::Error>, robot_mode: bool) -> ! {
    // Try to downcast to LoreError for structured output
    if let Some(gi_error) = e.downcast_ref::<LoreError>() {
        if robot_mode {
            let output = RobotErrorOutput::from(gi_error);
            // Use serde_json for safe serialization; fallback constructs JSON safely
            eprintln!(
                "{}",
                serde_json::to_string(&output).unwrap_or_else(|_| {
                    // Fallback uses serde to ensure proper escaping
                    let fallback = FallbackErrorOutput {
                        error: FallbackError {
                            code: "INTERNAL_ERROR".to_string(),
                            message: gi_error.to_string(),
                        },
                    };
                    serde_json::to_string(&fallback)
                        .unwrap_or_else(|_| r#"{"error":{"code":"INTERNAL_ERROR","message":"Serialization failed"}}"#.to_string())
                })
            );
            std::process::exit(gi_error.exit_code());
        } else {
            eprintln!("{} {}", style("Error:").red(), gi_error);
            if let Some(suggestion) = gi_error.suggestion() {
                eprintln!("{} {}", style("Hint:").yellow(), suggestion);
            }
            std::process::exit(gi_error.exit_code());
        }
    }

    // Fallback for non-LoreError errors - use serde for proper JSON escaping
    if robot_mode {
        let output = FallbackErrorOutput {
            error: FallbackError {
                code: "INTERNAL_ERROR".to_string(),
                message: e.to_string(),
            },
        };
        eprintln!(
            "{}",
            serde_json::to_string(&output).unwrap_or_else(|_| {
                r#"{"error":{"code":"INTERNAL_ERROR","message":"Serialization failed"}}"#
                    .to_string()
            })
        );
    } else {
        eprintln!("{} {}", style("Error:").red(), e);
    }
    std::process::exit(1);
}

// ============================================================================
// Primary command handlers
// ============================================================================

fn handle_issues(
    config_override: Option<&str>,
    args: IssuesArgs,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;
    let asc = args.asc && !args.no_asc;
    let has_due = args.has_due && !args.no_has_due;
    let open = args.open && !args.no_open;
    let order = if asc { "asc" } else { "desc" };

    if let Some(iid) = args.iid {
        // Show mode
        let result = run_show_issue(&config, iid, args.project.as_deref())?;
        if robot_mode {
            print_show_issue_json(&result);
        } else {
            print_show_issue(&result);
        }
    } else {
        // List mode
        let filters = ListFilters {
            limit: args.limit,
            project: args.project.as_deref(),
            state: args.state.as_deref(),
            author: args.author.as_deref(),
            assignee: args.assignee.as_deref(),
            labels: args.label.as_deref(),
            milestone: args.milestone.as_deref(),
            since: args.since.as_deref(),
            due_before: args.due_before.as_deref(),
            has_due_date: has_due,
            sort: &args.sort,
            order,
        };

        let result = run_list_issues(&config, filters)?;

        if open {
            open_issue_in_browser(&result);
        } else if robot_mode {
            print_list_issues_json(&result);
        } else {
            print_list_issues(&result);
        }
    }

    Ok(())
}

fn handle_mrs(
    config_override: Option<&str>,
    args: MrsArgs,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;
    let asc = args.asc && !args.no_asc;
    let open = args.open && !args.no_open;
    let order = if asc { "asc" } else { "desc" };

    if let Some(iid) = args.iid {
        // Show mode
        let result = run_show_mr(&config, iid, args.project.as_deref())?;
        if robot_mode {
            print_show_mr_json(&result);
        } else {
            print_show_mr(&result);
        }
    } else {
        // List mode
        let filters = MrListFilters {
            limit: args.limit,
            project: args.project.as_deref(),
            state: args.state.as_deref(),
            author: args.author.as_deref(),
            assignee: args.assignee.as_deref(),
            reviewer: args.reviewer.as_deref(),
            labels: args.label.as_deref(),
            since: args.since.as_deref(),
            draft: args.draft,
            no_draft: args.no_draft,
            target_branch: args.target.as_deref(),
            source_branch: args.source.as_deref(),
            sort: &args.sort,
            order,
        };

        let result = run_list_mrs(&config, filters)?;

        if open {
            open_mr_in_browser(&result);
        } else if robot_mode {
            print_list_mrs_json(&result);
        } else {
            print_list_mrs(&result);
        }
    }

    Ok(())
}

async fn handle_ingest(
    config_override: Option<&str>,
    args: IngestArgs,
    robot_mode: bool,
    quiet: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;
    let display = if robot_mode || quiet {
        IngestDisplay::silent()
    } else {
        IngestDisplay::interactive()
    };

    let force = args.force && !args.no_force;
    let full = args.full && !args.no_full;

    match args.entity.as_deref() {
        Some(resource_type) => {
            // Single entity ingest
            let result = run_ingest(
                &config,
                resource_type,
                args.project.as_deref(),
                force,
                full,
                display,
            )
            .await?;

            if robot_mode {
                print_ingest_summary_json(&result);
            } else {
                print_ingest_summary(&result);
            }
        }
        None => {
            // Ingest everything: issues then MRs
            if !robot_mode && !quiet {
                println!(
                    "{}",
                    style("Ingesting all content (issues + merge requests)...").blue()
                );
                println!();
            }

            let issues_result = run_ingest(
                &config,
                "issues",
                args.project.as_deref(),
                force,
                full,
                display,
            )
            .await?;

            let mrs_result = run_ingest(
                &config,
                "mrs",
                args.project.as_deref(),
                force,
                full,
                display,
            )
            .await?;

            if robot_mode {
                print_combined_ingest_json(&issues_result, &mrs_result);
            } else {
                print_ingest_summary(&issues_result);
                print_ingest_summary(&mrs_result);
            }
        }
    }

    Ok(())
}

/// JSON output for combined ingest (issues + mrs).
#[derive(Serialize)]
struct CombinedIngestOutput {
    ok: bool,
    data: CombinedIngestData,
}

#[derive(Serialize)]
struct CombinedIngestData {
    resource_type: String,
    issues: CombinedIngestEntityStats,
    merge_requests: CombinedIngestEntityStats,
}

#[derive(Serialize)]
struct CombinedIngestEntityStats {
    projects_synced: usize,
    fetched: usize,
    upserted: usize,
    labels_created: usize,
    discussions_fetched: usize,
    notes_upserted: usize,
}

fn print_combined_ingest_json(
    issues: &lore::cli::commands::ingest::IngestResult,
    mrs: &lore::cli::commands::ingest::IngestResult,
) {
    let output = CombinedIngestOutput {
        ok: true,
        data: CombinedIngestData {
            resource_type: "all".to_string(),
            issues: CombinedIngestEntityStats {
                projects_synced: issues.projects_synced,
                fetched: issues.issues_fetched,
                upserted: issues.issues_upserted,
                labels_created: issues.labels_created,
                discussions_fetched: issues.discussions_fetched,
                notes_upserted: issues.notes_upserted,
            },
            merge_requests: CombinedIngestEntityStats {
                projects_synced: mrs.projects_synced,
                fetched: mrs.mrs_fetched,
                upserted: mrs.mrs_upserted,
                labels_created: mrs.labels_created,
                discussions_fetched: mrs.discussions_fetched,
                notes_upserted: mrs.notes_upserted,
            },
        },
    };

    println!("{}", serde_json::to_string(&output).unwrap());
}

async fn handle_count(
    config_override: Option<&str>,
    args: CountArgs,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;

    if args.entity == "events" {
        let counts = run_count_events(&config)?;
        if robot_mode {
            print_event_count_json(&counts);
        } else {
            print_event_count(&counts);
        }
        return Ok(());
    }

    let result = run_count(&config, &args.entity, args.for_entity.as_deref())?;
    if robot_mode {
        print_count_json(&result);
    } else {
        print_count(&result);
    }
    Ok(())
}

async fn handle_sync_status_cmd(
    config_override: Option<&str>,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;

    let result = run_sync_status(&config)?;
    if robot_mode {
        print_sync_status_json(&result);
    } else {
        print_sync_status(&result);
    }
    Ok(())
}

/// JSON output for init command.
#[derive(Serialize)]
struct InitOutput {
    ok: bool,
    data: InitOutputData,
}

#[derive(Serialize)]
struct InitOutputData {
    config_path: String,
    data_dir: String,
    user: InitOutputUser,
    projects: Vec<InitOutputProject>,
}

#[derive(Serialize)]
struct InitOutputUser {
    username: String,
    name: String,
}

#[derive(Serialize)]
struct InitOutputProject {
    path: String,
    name: String,
}

fn print_init_json(result: &InitResult) {
    let output = InitOutput {
        ok: true,
        data: InitOutputData {
            config_path: result.config_path.clone(),
            data_dir: result.data_dir.clone(),
            user: InitOutputUser {
                username: result.user.username.clone(),
                name: result.user.name.clone(),
            },
            projects: result
                .projects
                .iter()
                .map(|p| InitOutputProject {
                    path: p.path.clone(),
                    name: p.name.clone(),
                })
                .collect(),
        },
    };
    println!("{}", serde_json::to_string(&output).unwrap());
}

async fn handle_init(
    config_override: Option<&str>,
    force: bool,
    non_interactive: bool,
    robot_mode: bool,
    gitlab_url_flag: Option<String>,
    token_env_var_flag: Option<String>,
    projects_flag: Option<String>,
) -> Result<(), Box<dyn std::error::Error>> {
    // Robot mode: require all inputs via flags, skip interactive prompts
    if robot_mode {
        let missing: Vec<&str> = [
            gitlab_url_flag.is_none().then_some("--gitlab-url"),
            token_env_var_flag.is_none().then_some("--token-env-var"),
            projects_flag.is_none().then_some("--projects"),
        ]
        .into_iter()
        .flatten()
        .collect();

        if !missing.is_empty() {
            let output = RobotErrorWithSuggestion {
                error: RobotErrorSuggestionData {
                    code: "MISSING_FLAGS".to_string(),
                    message: format!("Robot mode requires flags: {}", missing.join(", ")),
                    suggestion: "lore --robot init --gitlab-url https://gitlab.com --token-env-var GITLAB_TOKEN --projects group/project".to_string(),
                },
            };
            eprintln!("{}", serde_json::to_string(&output)?);
            std::process::exit(2);
        }

        let project_paths: Vec<String> = projects_flag
            .unwrap()
            .split(',')
            .map(|p| p.trim().to_string())
            .filter(|p| !p.is_empty())
            .collect();

        let result = run_init(
            InitInputs {
                gitlab_url: gitlab_url_flag.unwrap(),
                token_env_var: token_env_var_flag.unwrap(),
                project_paths,
            },
            InitOptions {
                config_path: config_override.map(String::from),
                force: true,
                non_interactive: true,
            },
        )
        .await?;

        print_init_json(&result);
        return Ok(());
    }

    // Human mode: interactive prompts
    let config_path = get_config_path(config_override);
    let mut confirmed_overwrite = force;

    if config_path.exists() && !force {
        if non_interactive {
            eprintln!(
                "{}",
                style(format!(
                    "Config file exists at {}. Use --force to overwrite.",
                    config_path.display()
                ))
                .red()
            );
            std::process::exit(2);
        }

        let confirm = Confirm::new()
            .with_prompt(format!(
                "Config file exists at {}. Overwrite?",
                config_path.display()
            ))
            .default(false)
            .interact()?;

        if !confirm {
            println!("{}", style("Cancelled.").yellow());
            std::process::exit(2);
        }
        confirmed_overwrite = true;
    }

    let gitlab_url: String = if let Some(url) = gitlab_url_flag {
        url
    } else {
        Input::new()
            .with_prompt("GitLab URL")
            .default("https://gitlab.com".to_string())
            .validate_with(|input: &String| -> Result<(), &str> {
                if url::Url::parse(input).is_ok() {
                    Ok(())
                } else {
                    Err("Please enter a valid URL")
                }
            })
            .interact_text()?
    };

    let token_env_var: String = if let Some(var) = token_env_var_flag {
        var
    } else {
        Input::new()
            .with_prompt("Token environment variable name")
            .default("GITLAB_TOKEN".to_string())
            .interact_text()?
    };

    let project_paths: Vec<String> = if let Some(projects) = projects_flag {
        projects
            .split(',')
            .map(|p| p.trim().to_string())
            .filter(|p| !p.is_empty())
            .collect()
    } else {
        let project_paths_input: String = Input::new()
            .with_prompt("Project paths (comma-separated, e.g., group/project)")
            .validate_with(|input: &String| -> Result<(), &str> {
                if input.trim().is_empty() {
                    Err("Please enter at least one project path")
                } else {
                    Ok(())
                }
            })
            .interact_text()?;

        project_paths_input
            .split(',')
            .map(|p| p.trim().to_string())
            .filter(|p| !p.is_empty())
            .collect()
    };

    println!("{}", style("\nValidating configuration...").blue());

    let result = run_init(
        InitInputs {
            gitlab_url,
            token_env_var,
            project_paths,
        },
        InitOptions {
            config_path: config_override.map(String::from),
            force: confirmed_overwrite,
            non_interactive,
        },
    )
    .await?;

    println!(
        "{}",
        style(format!(
            "\n✓ Authenticated as @{} ({})",
            result.user.username, result.user.name
        ))
        .green()
    );

    for project in &result.projects {
        println!(
            "{}",
            style(format!("✓ {} ({})", project.path, project.name)).green()
        );
    }

    println!(
        "{}",
        style(format!("\n✓ Config written to {}", result.config_path)).green()
    );
    println!(
        "{}",
        style(format!("✓ Database initialized at {}", result.data_dir)).green()
    );
    println!(
        "{}",
        style("\nSetup complete! Run 'lore doctor' to verify.").blue()
    );

    Ok(())
}

/// JSON output for auth-test command.
#[derive(Serialize)]
struct AuthTestOutput {
    ok: bool,
    data: AuthTestData,
}

#[derive(Serialize)]
struct AuthTestData {
    authenticated: bool,
    username: String,
    name: String,
    gitlab_url: String,
}

async fn handle_auth_test(
    config_override: Option<&str>,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    match run_auth_test(config_override).await {
        Ok(result) => {
            if robot_mode {
                let output = AuthTestOutput {
                    ok: true,
                    data: AuthTestData {
                        authenticated: true,
                        username: result.username.clone(),
                        name: result.name.clone(),
                        gitlab_url: result.base_url.clone(),
                    },
                };
                println!("{}", serde_json::to_string(&output)?);
            } else {
                println!("Authenticated as @{} ({})", result.username, result.name);
                println!("GitLab: {}", result.base_url);
            }
            Ok(())
        }
        Err(e) => {
            if robot_mode {
                let output = FallbackErrorOutput {
                    error: FallbackError {
                        code: "AUTH_FAILED".to_string(),
                        message: e.to_string(),
                    },
                };
                eprintln!("{}", serde_json::to_string(&output)?);
            } else {
                eprintln!("{}", style(format!("Error: {e}")).red());
            }
            std::process::exit(5); // AUTH_FAILED exit code
        }
    }
}

async fn handle_doctor(
    config_override: Option<&str>,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let result = run_doctor(config_override).await;

    if robot_mode {
        println!("{}", serde_json::to_string_pretty(&result)?);
    } else {
        print_doctor_results(&result);
    }

    if !result.success {
        std::process::exit(1);
    }

    Ok(())
}

/// JSON output for version command.
#[derive(Serialize)]
struct VersionOutput {
    ok: bool,
    data: VersionData,
}

#[derive(Serialize)]
struct VersionData {
    version: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    git_hash: Option<String>,
}

fn handle_version(robot_mode: bool) -> Result<(), Box<dyn std::error::Error>> {
    let version = env!("CARGO_PKG_VERSION").to_string();
    let git_hash = env!("GIT_HASH").to_string();
    if robot_mode {
        let output = VersionOutput {
            ok: true,
            data: VersionData {
                version,
                git_hash: if git_hash.is_empty() {
                    None
                } else {
                    Some(git_hash)
                },
            },
        };
        println!("{}", serde_json::to_string(&output)?);
    } else if git_hash.is_empty() {
        println!("lore version {}", version);
    } else {
        println!("lore version {} ({})", version, git_hash);
    }
    Ok(())
}

fn handle_completions(shell: &str) -> Result<(), Box<dyn std::error::Error>> {
    use clap::CommandFactory;
    use clap_complete::{Shell, generate};

    let shell = match shell {
        "bash" => Shell::Bash,
        "zsh" => Shell::Zsh,
        "fish" => Shell::Fish,
        "powershell" => Shell::PowerShell,
        _ => unreachable!(),
    };

    let mut cmd = Cli::command();
    generate(shell, &mut cmd, "lore", &mut std::io::stdout());
    Ok(())
}

fn handle_backup(robot_mode: bool) -> Result<(), Box<dyn std::error::Error>> {
    if robot_mode {
        let output = RobotErrorWithSuggestion {
            error: RobotErrorSuggestionData {
                code: "NOT_IMPLEMENTED".to_string(),
                message: "The 'backup' command is not yet implemented.".to_string(),
                suggestion: "Use manual database backup: cp ~/.local/share/lore/lore.db ~/.local/share/lore/lore.db.bak".to_string(),
            },
        };
        eprintln!("{}", serde_json::to_string(&output)?);
    } else {
        eprintln!(
            "{} The 'backup' command is not yet implemented.",
            style("Error:").red()
        );
    }
    std::process::exit(1);
}

fn handle_reset(robot_mode: bool) -> Result<(), Box<dyn std::error::Error>> {
    if robot_mode {
        let output = RobotErrorWithSuggestion {
            error: RobotErrorSuggestionData {
                code: "NOT_IMPLEMENTED".to_string(),
                message: "The 'reset' command is not yet implemented.".to_string(),
                suggestion: "Manually delete the database: rm ~/.local/share/lore/lore.db"
                    .to_string(),
            },
        };
        eprintln!("{}", serde_json::to_string(&output)?);
    } else {
        eprintln!(
            "{} The 'reset' command is not yet implemented.",
            style("Error:").red()
        );
    }
    std::process::exit(1);
}

/// JSON output for migrate command.
#[derive(Serialize)]
struct MigrateOutput {
    ok: bool,
    data: MigrateData,
}

#[derive(Serialize)]
struct MigrateData {
    before_version: i32,
    after_version: i32,
    migrated: bool,
}

/// JSON error output with suggestion field.
#[derive(Serialize)]
struct RobotErrorWithSuggestion {
    error: RobotErrorSuggestionData,
}

#[derive(Serialize)]
struct RobotErrorSuggestionData {
    code: String,
    message: String,
    suggestion: String,
}

async fn handle_migrate(
    config_override: Option<&str>,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;
    let db_path = get_db_path(config.storage.db_path.as_deref());

    if !db_path.exists() {
        if robot_mode {
            let output = RobotErrorWithSuggestion {
                error: RobotErrorSuggestionData {
                    code: "DB_ERROR".to_string(),
                    message: format!("Database not found at {}", db_path.display()),
                    suggestion: "Run 'lore init' first".to_string(),
                },
            };
            eprintln!("{}", serde_json::to_string(&output)?);
        } else {
            eprintln!(
                "{}",
                style(format!("Database not found at {}", db_path.display())).red()
            );
            eprintln!(
                "{}",
                style("Run 'lore init' first to create the database.").yellow()
            );
        }
        std::process::exit(10); // DB_ERROR exit code
    }

    let conn = create_connection(&db_path)?;
    let before_version = get_schema_version(&conn);

    if !robot_mode {
        println!(
            "{}",
            style(format!("Current schema version: {}", before_version)).blue()
        );
    }

    run_migrations(&conn)?;

    let after_version = get_schema_version(&conn);

    if robot_mode {
        let output = MigrateOutput {
            ok: true,
            data: MigrateData {
                before_version,
                after_version,
                migrated: after_version > before_version,
            },
        };
        println!("{}", serde_json::to_string(&output)?);
    } else if after_version > before_version {
        println!(
            "{}",
            style(format!(
                "Migrations applied: {} -> {}",
                before_version, after_version
            ))
            .green()
        );
    } else {
        println!("{}", style("Database is already up to date.").green());
    }

    Ok(())
}

async fn handle_stats(
    config_override: Option<&str>,
    args: StatsArgs,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;
    // Auto-enable --check when --repair is used
    let check = (args.check && !args.no_check) || args.repair;
    let result = run_stats(&config, check, args.repair)?;
    if robot_mode {
        print_stats_json(&result);
    } else {
        print_stats(&result);
    }
    Ok(())
}

async fn handle_search(
    config_override: Option<&str>,
    args: SearchArgs,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;
    let explain = args.explain && !args.no_explain;

    let fts_mode = match args.fts_mode.as_str() {
        "raw" => lore::search::FtsQueryMode::Raw,
        _ => lore::search::FtsQueryMode::Safe,
    };

    let cli_filters = SearchCliFilters {
        source_type: args.source_type,
        author: args.author,
        project: args.project,
        labels: args.label,
        path: args.path,
        after: args.after,
        updated_after: args.updated_after,
        limit: args.limit,
    };

    let start = std::time::Instant::now();
    let response = run_search(&config, &args.query, cli_filters, fts_mode, explain)?;
    let elapsed_ms = start.elapsed().as_millis() as u64;

    if robot_mode {
        print_search_results_json(&response, elapsed_ms);
    } else {
        print_search_results(&response);
    }
    Ok(())
}

async fn handle_generate_docs(
    config_override: Option<&str>,
    args: GenerateDocsArgs,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;

    let result = run_generate_docs(&config, args.full, args.project.as_deref())?;
    if robot_mode {
        print_generate_docs_json(&result);
    } else {
        print_generate_docs(&result);
    }
    Ok(())
}

async fn handle_embed(
    config_override: Option<&str>,
    args: EmbedArgs,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;
    let full = args.full && !args.no_full;
    let retry_failed = args.retry_failed && !args.no_retry_failed;
    let result = run_embed(&config, full, retry_failed).await?;
    if robot_mode {
        print_embed_json(&result);
    } else {
        print_embed(&result);
    }
    Ok(())
}

async fn handle_sync_cmd(
    config_override: Option<&str>,
    args: SyncArgs,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let mut config = Config::load(config_override)?;
    if args.no_events {
        config.sync.fetch_resource_events = false;
    }
    let options = SyncOptions {
        full: args.full && !args.no_full,
        force: args.force && !args.no_force,
        no_embed: args.no_embed,
        no_docs: args.no_docs,
        no_events: args.no_events,
        robot_mode,
    };

    let start = std::time::Instant::now();
    let result = run_sync(&config, options).await?;
    let elapsed = start.elapsed();

    if robot_mode {
        print_sync_json(&result, elapsed.as_millis() as u64);
    } else {
        print_sync(&result, elapsed);
    }
    Ok(())
}

// ============================================================================
// Health + Robot-docs handlers
// ============================================================================

/// JSON output for health command.
#[derive(Serialize)]
struct HealthOutput {
    ok: bool,
    data: HealthData,
}

#[derive(Serialize)]
struct HealthData {
    healthy: bool,
    config_found: bool,
    db_found: bool,
    schema_current: bool,
    schema_version: i32,
}

async fn handle_health(
    config_override: Option<&str>,
    robot_mode: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config_path = get_config_path(config_override);
    let config_found = config_path.exists();

    let (db_found, schema_version, schema_current) = if config_found {
        match Config::load(config_override) {
            Ok(config) => {
                let db_path = get_db_path(config.storage.db_path.as_deref());
                if db_path.exists() {
                    match create_connection(&db_path) {
                        Ok(conn) => {
                            let version = get_schema_version(&conn);
                            (true, version, version >= LATEST_SCHEMA_VERSION)
                        }
                        Err(_) => (true, 0, false),
                    }
                } else {
                    (false, 0, false)
                }
            }
            Err(_) => (false, 0, false),
        }
    } else {
        (false, 0, false)
    };

    let healthy = config_found && db_found && schema_current;

    if robot_mode {
        let output = HealthOutput {
            ok: true,
            data: HealthData {
                healthy,
                config_found,
                db_found,
                schema_current,
                schema_version,
            },
        };
        println!("{}", serde_json::to_string(&output)?);
    } else {
        let status = |ok: bool| {
            if ok {
                style("pass").green()
            } else {
                style("FAIL").red()
            }
        };
        println!(
            "Config:  {} ({})",
            status(config_found),
            config_path.display()
        );
        println!("DB:      {}", status(db_found));
        println!("Schema:  {} (v{})", status(schema_current), schema_version);
        println!();
        if healthy {
            println!("{}", style("Healthy").green().bold());
        } else {
            println!(
                "{}",
                style("Unhealthy - run 'lore doctor' for details")
                    .red()
                    .bold()
            );
        }
    }

    if !healthy {
        std::process::exit(1);
    }

    Ok(())
}

/// JSON output for robot-docs command.
#[derive(Serialize)]
struct RobotDocsOutput {
    ok: bool,
    data: RobotDocsData,
}

#[derive(Serialize)]
struct RobotDocsData {
    name: String,
    version: String,
    description: String,
    activation: RobotDocsActivation,
    commands: serde_json::Value,
    exit_codes: serde_json::Value,
    error_format: String,
    workflows: serde_json::Value,
}

#[derive(Serialize)]
struct RobotDocsActivation {
    flags: Vec<String>,
    env: String,
    auto: String,
}

fn handle_robot_docs(robot_mode: bool) -> Result<(), Box<dyn std::error::Error>> {
    let version = env!("CARGO_PKG_VERSION").to_string();

    let commands = serde_json::json!({
        "init": {
            "description": "Initialize configuration and database",
            "flags": ["--force", "--non-interactive", "--gitlab-url <URL>", "--token-env-var <VAR>", "--projects <paths>"],
            "robot_flags": ["--gitlab-url", "--token-env-var", "--projects"],
            "example": "lore --robot init --gitlab-url https://gitlab.com --token-env-var GITLAB_TOKEN --projects group/project"
        },
        "health": {
            "description": "Quick pre-flight check: config, database, schema version",
            "flags": [],
            "example": "lore --robot health"
        },
        "auth": {
            "description": "Verify GitLab authentication",
            "flags": [],
            "example": "lore --robot auth"
        },
        "doctor": {
            "description": "Full environment health check (config, auth, DB, Ollama)",
            "flags": [],
            "example": "lore --robot doctor"
        },
        "ingest": {
            "description": "Sync data from GitLab",
            "flags": ["--project <path>", "--force", "--full", "<entity: issues|mrs>"],
            "example": "lore --robot ingest issues --project group/repo"
        },
        "sync": {
            "description": "Full sync pipeline: ingest -> generate-docs -> embed",
            "flags": ["--full", "--force", "--no-embed", "--no-docs"],
            "example": "lore --robot sync"
        },
        "issues": {
            "description": "List or show issues",
            "flags": ["<IID>", "--limit", "--state", "--project", "--author", "--assignee", "--label", "--milestone", "--since", "--due-before", "--has-due", "--sort", "--asc"],
            "example": "lore --robot issues --state opened --limit 10"
        },
        "mrs": {
            "description": "List or show merge requests",
            "flags": ["<IID>", "--limit", "--state", "--project", "--author", "--assignee", "--reviewer", "--label", "--since", "--draft", "--no-draft", "--target", "--source", "--sort", "--asc"],
            "example": "lore --robot mrs --state opened"
        },
        "search": {
            "description": "Search indexed documents (lexical, hybrid, semantic)",
            "flags": ["<QUERY>", "--mode", "--type", "--author", "--project", "--label", "--path", "--after", "--updated-after", "--limit", "--explain", "--fts-mode"],
            "example": "lore --robot search 'authentication bug' --mode hybrid --limit 10"
        },
        "count": {
            "description": "Count entities in local database",
            "flags": ["<entity: issues|mrs|discussions|notes>", "--for <issue|mr>"],
            "example": "lore --robot count issues"
        },
        "stats": {
            "description": "Show document and index statistics",
            "flags": ["--check", "--repair"],
            "example": "lore --robot stats"
        },
        "status": {
            "description": "Show sync state (cursors, last sync times)",
            "flags": [],
            "example": "lore --robot status"
        },
        "generate-docs": {
            "description": "Generate searchable documents from ingested data",
            "flags": ["--full", "--project <path>"],
            "example": "lore --robot generate-docs --full"
        },
        "embed": {
            "description": "Generate vector embeddings for documents via Ollama",
            "flags": ["--full", "--retry-failed"],
            "example": "lore --robot embed"
        },
        "migrate": {
            "description": "Run pending database migrations",
            "flags": [],
            "example": "lore --robot migrate"
        },
        "version": {
            "description": "Show version information",
            "flags": [],
            "example": "lore --robot version"
        },
        "robot-docs": {
            "description": "This command (agent self-discovery manifest)",
            "flags": [],
            "example": "lore robot-docs"
        }
    });

    let exit_codes = serde_json::json!({
        "0": "Success",
        "1": "Internal error / health check failed / not implemented",
        "2": "Usage error (invalid flags or arguments)",
        "3": "Config invalid",
        "4": "Token not set",
        "5": "GitLab auth failed",
        "6": "Resource not found",
        "7": "Rate limited",
        "8": "Network error",
        "9": "Database locked",
        "10": "Database error",
        "11": "Migration failed",
        "12": "I/O error",
        "13": "Transform error",
        "14": "Ollama unavailable",
        "15": "Ollama model not found",
        "16": "Embedding failed",
        "17": "Not found",
        "18": "Ambiguous match",
        "20": "Config not found"
    });

    let workflows = serde_json::json!({
        "first_setup": [
            "lore --robot init --gitlab-url https://gitlab.com --token-env-var GITLAB_TOKEN --projects group/project",
            "lore --robot doctor",
            "lore --robot sync"
        ],
        "daily_sync": [
            "lore --robot sync"
        ],
        "search": [
            "lore --robot search 'query' --mode hybrid"
        ],
        "pre_flight": [
            "lore --robot health"
        ]
    });

    let output = RobotDocsOutput {
        ok: true,
        data: RobotDocsData {
            name: "lore".to_string(),
            version,
            description: "Local GitLab data management with semantic search".to_string(),
            activation: RobotDocsActivation {
                flags: vec!["--robot".to_string(), "-J".to_string(), "--json".to_string()],
                env: "LORE_ROBOT=1".to_string(),
                auto: "Non-TTY stdout".to_string(),
            },
            commands,
            exit_codes,
            error_format: "stderr JSON: {\"error\":{\"code\":\"...\",\"message\":\"...\",\"suggestion\":\"...\"}}".to_string(),
            workflows,
        },
    };

    if robot_mode {
        println!("{}", serde_json::to_string(&output)?);
    } else {
        println!("{}", serde_json::to_string_pretty(&output)?);
    }

    Ok(())
}

// ============================================================================
// Backward-compat handlers (deprecated, delegate to new handlers)
// ============================================================================

#[allow(clippy::too_many_arguments)]
async fn handle_list_compat(
    config_override: Option<&str>,
    entity: &str,
    limit: usize,
    project_filter: Option<&str>,
    state_filter: Option<&str>,
    author_filter: Option<&str>,
    assignee_filter: Option<&str>,
    label_filter: Option<&[String]>,
    milestone_filter: Option<&str>,
    since_filter: Option<&str>,
    due_before_filter: Option<&str>,
    has_due_date: bool,
    sort: &str,
    order: &str,
    open_browser: bool,
    json_output: bool,
    draft: bool,
    no_draft: bool,
    reviewer_filter: Option<&str>,
    target_branch_filter: Option<&str>,
    source_branch_filter: Option<&str>,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;

    match entity {
        "issues" => {
            let filters = ListFilters {
                limit,
                project: project_filter,
                state: state_filter,
                author: author_filter,
                assignee: assignee_filter,
                labels: label_filter,
                milestone: milestone_filter,
                since: since_filter,
                due_before: due_before_filter,
                has_due_date,
                sort,
                order,
            };

            let result = run_list_issues(&config, filters)?;

            if open_browser {
                open_issue_in_browser(&result);
            } else if json_output {
                print_list_issues_json(&result);
            } else {
                print_list_issues(&result);
            }

            Ok(())
        }
        "mrs" => {
            let filters = MrListFilters {
                limit,
                project: project_filter,
                state: state_filter,
                author: author_filter,
                assignee: assignee_filter,
                reviewer: reviewer_filter,
                labels: label_filter,
                since: since_filter,
                draft,
                no_draft,
                target_branch: target_branch_filter,
                source_branch: source_branch_filter,
                sort,
                order,
            };

            let result = run_list_mrs(&config, filters)?;

            if open_browser {
                open_mr_in_browser(&result);
            } else if json_output {
                print_list_mrs_json(&result);
            } else {
                print_list_mrs(&result);
            }

            Ok(())
        }
        _ => {
            eprintln!("{}", style(format!("Unknown entity: {entity}")).red());
            std::process::exit(1);
        }
    }
}

async fn handle_show_compat(
    config_override: Option<&str>,
    entity: &str,
    iid: i64,
    project_filter: Option<&str>,
    json: bool,
) -> Result<(), Box<dyn std::error::Error>> {
    let config = Config::load(config_override)?;

    match entity {
        "issue" => {
            let result = run_show_issue(&config, iid, project_filter)?;
            if json {
                print_show_issue_json(&result);
            } else {
                print_show_issue(&result);
            }
            Ok(())
        }
        "mr" => {
            let result = run_show_mr(&config, iid, project_filter)?;
            if json {
                print_show_mr_json(&result);
            } else {
                print_show_mr(&result);
            }
            Ok(())
        }
        _ => {
            eprintln!("{}", style(format!("Unknown entity: {entity}")).red());
            std::process::exit(1);
        }
    }
}