//! List command - display issues/MRs from local database.

use comfy_table::{Attribute, Cell, Color, ContentArrangement, Table};
use rusqlite::Connection;
use serde::Serialize;

use crate::Config;
use crate::core::db::create_connection;
use crate::core::error::Result;
use crate::core::paths::get_db_path;
use crate::core::time::{ms_to_iso, now_ms, parse_since};

/// Issue row for display.
#[derive(Debug, Serialize)]
pub struct IssueListRow {
    pub iid: i64,
    pub title: String,
    pub state: String,
    pub author_username: String,
    pub created_at: i64,
    pub updated_at: i64,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub web_url: Option<String>,
    pub project_path: String,
    pub labels: Vec<String>,
    pub assignees: Vec<String>,
    pub discussion_count: i64,
    pub unresolved_count: i64,
}

/// Serializable version for JSON output.
#[derive(Serialize)]
pub struct IssueListRowJson {
    pub iid: i64,
    pub title: String,
    pub state: String,
    pub author_username: String,
    pub labels: Vec<String>,
    pub assignees: Vec<String>,
    pub discussion_count: i64,
    pub unresolved_count: i64,
    pub created_at_iso: String,
    pub updated_at_iso: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub web_url: Option<String>,
    pub project_path: String,
}

impl From<&IssueListRow> for IssueListRowJson {
    fn from(row: &IssueListRow) -> Self {
        Self {
            iid: row.iid,
            title: row.title.clone(),
            state: row.state.clone(),
            author_username: row.author_username.clone(),
            labels: row.labels.clone(),
            assignees: row.assignees.clone(),
            discussion_count: row.discussion_count,
            unresolved_count: row.unresolved_count,
            created_at_iso: ms_to_iso(row.created_at),
            updated_at_iso: ms_to_iso(row.updated_at),
            web_url: row.web_url.clone(),
            project_path: row.project_path.clone(),
        }
    }
}

/// Result of list query.
#[derive(Serialize)]
pub struct ListResult {
    pub issues: Vec<IssueListRow>,
    pub total_count: usize,
}

/// JSON output structure.
#[derive(Serialize)]
pub struct ListResultJson {
    pub issues: Vec<IssueListRowJson>,
    pub total_count: usize,
    pub showing: usize,
}

impl From<&ListResult> for ListResultJson {
    fn from(result: &ListResult) -> Self {
        Self {
            issues: result.issues.iter().map(IssueListRowJson::from).collect(),
            total_count: result.total_count,
            showing: result.issues.len(),
        }
    }
}

/// MR row for display.
#[derive(Debug, Serialize)]
pub struct MrListRow {
    pub iid: i64,
    pub title: String,
    pub state: String,
    pub draft: bool,
    pub author_username: String,
    pub source_branch: String,
    pub target_branch: String,
    pub created_at: i64,
    pub updated_at: i64,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub web_url: Option<String>,
    pub project_path: String,
    pub labels: Vec<String>,
    pub assignees: Vec<String>,
    pub reviewers: Vec<String>,
    pub discussion_count: i64,
    pub unresolved_count: i64,
}

/// Serializable version for JSON output.
#[derive(Serialize)]
pub struct MrListRowJson {
    pub iid: i64,
    pub title: String,
    pub state: String,
    pub draft: bool,
    pub author_username: String,
    pub source_branch: String,
    pub target_branch: String,
    pub labels: Vec<String>,
    pub assignees: Vec<String>,
    pub reviewers: Vec<String>,
    pub discussion_count: i64,
    pub unresolved_count: i64,
    pub created_at_iso: String,
    pub updated_at_iso: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub web_url: Option<String>,
    pub project_path: String,
}

impl From<&MrListRow> for MrListRowJson {
    fn from(row: &MrListRow) -> Self {
        Self {
            iid: row.iid,
            title: row.title.clone(),
            state: row.state.clone(),
            draft: row.draft,
            author_username: row.author_username.clone(),
            source_branch: row.source_branch.clone(),
            target_branch: row.target_branch.clone(),
            labels: row.labels.clone(),
            assignees: row.assignees.clone(),
            reviewers: row.reviewers.clone(),
            discussion_count: row.discussion_count,
            unresolved_count: row.unresolved_count,
            created_at_iso: ms_to_iso(row.created_at),
            updated_at_iso: ms_to_iso(row.updated_at),
            web_url: row.web_url.clone(),
            project_path: row.project_path.clone(),
        }
    }
}

/// Result of MR list query.
#[derive(Serialize)]
pub struct MrListResult {
    pub mrs: Vec<MrListRow>,
    pub total_count: usize,
}

/// JSON output structure for MRs.
#[derive(Serialize)]
pub struct MrListResultJson {
    pub mrs: Vec<MrListRowJson>,
    pub total_count: usize,
    pub showing: usize,
}

impl From<&MrListResult> for MrListResultJson {
    fn from(result: &MrListResult) -> Self {
        Self {
            mrs: result.mrs.iter().map(MrListRowJson::from).collect(),
            total_count: result.total_count,
            showing: result.mrs.len(),
        }
    }
}

/// Filter options for issue list query.
pub struct ListFilters<'a> {
    pub limit: usize,
    pub project: Option<&'a str>,
    pub state: Option<&'a str>,
    pub author: Option<&'a str>,
    pub assignee: Option<&'a str>,
    pub labels: Option<&'a [String]>,
    pub milestone: Option<&'a str>,
    pub since: Option<&'a str>,
    pub due_before: Option<&'a str>,
    pub has_due_date: bool,
    pub sort: &'a str,
    pub order: &'a str,
}

/// Filter options for MR list query.
pub struct MrListFilters<'a> {
    pub limit: usize,
    pub project: Option<&'a str>,
    pub state: Option<&'a str>,
    pub author: Option<&'a str>,
    pub assignee: Option<&'a str>,
    pub reviewer: Option<&'a str>,
    pub labels: Option<&'a [String]>,
    pub since: Option<&'a str>,
    pub draft: bool,
    pub no_draft: bool,
    pub target_branch: Option<&'a str>,
    pub source_branch: Option<&'a str>,
    pub sort: &'a str,
    pub order: &'a str,
}

/// Run the list issues command.
pub fn run_list_issues(config: &Config, filters: ListFilters) -> Result<ListResult> {
    let db_path = get_db_path(config.storage.db_path.as_deref());
    let conn = create_connection(&db_path)?;

    let result = query_issues(&conn, &filters)?;
    Ok(result)
}

/// Query issues from database with enriched data.
fn query_issues(conn: &Connection, filters: &ListFilters) -> Result<ListResult> {
    // Build WHERE clause
    let mut where_clauses = Vec::new();
    let mut params: Vec<Box<dyn rusqlite::ToSql>> = Vec::new();

    if let Some(project) = filters.project {
        // Exact match or suffix match after '/' to avoid partial matches
        // e.g. "foo" matches "group/foo" but NOT "group/foobar"
        where_clauses.push("(p.path_with_namespace = ? OR p.path_with_namespace LIKE ?)");
        params.push(Box::new(project.to_string()));
        params.push(Box::new(format!("%/{project}")));
    }

    if let Some(state) = filters.state
        && state != "all"
    {
        where_clauses.push("i.state = ?");
        params.push(Box::new(state.to_string()));
    }

    // Handle author filter (strip leading @ if present)
    if let Some(author) = filters.author {
        let username = author.strip_prefix('@').unwrap_or(author);
        where_clauses.push("i.author_username = ?");
        params.push(Box::new(username.to_string()));
    }

    // Handle assignee filter (strip leading @ if present)
    if let Some(assignee) = filters.assignee {
        let username = assignee.strip_prefix('@').unwrap_or(assignee);
        where_clauses.push(
            "EXISTS (SELECT 1 FROM issue_assignees ia
             WHERE ia.issue_id = i.id AND ia.username = ?)",
        );
        params.push(Box::new(username.to_string()));
    }

    // Handle since filter
    if let Some(since_str) = filters.since
        && let Some(cutoff_ms) = parse_since(since_str)
    {
        where_clauses.push("i.updated_at >= ?");
        params.push(Box::new(cutoff_ms));
    }

    // Handle label filters (AND logic - all labels must be present)
    if let Some(labels) = filters.labels {
        for label in labels {
            where_clauses.push(
                "EXISTS (SELECT 1 FROM issue_labels il
                 JOIN labels l ON il.label_id = l.id
                 WHERE il.issue_id = i.id AND l.name = ?)",
            );
            params.push(Box::new(label.clone()));
        }
    }

    // Handle milestone filter
    if let Some(milestone) = filters.milestone {
        where_clauses.push("i.milestone_title = ?");
        params.push(Box::new(milestone.to_string()));
    }

    // Handle due_before filter
    if let Some(due_before) = filters.due_before {
        where_clauses.push("i.due_date IS NOT NULL AND i.due_date <= ?");
        params.push(Box::new(due_before.to_string()));
    }

    // Handle has_due_date filter
    if filters.has_due_date {
        where_clauses.push("i.due_date IS NOT NULL");
    }

    let where_sql = if where_clauses.is_empty() {
        String::new()
    } else {
        format!("WHERE {}", where_clauses.join(" AND "))
    };

    // Get total count
    let count_sql = format!(
        "SELECT COUNT(*) FROM issues i
         JOIN projects p ON i.project_id = p.id
         {where_sql}"
    );

    let param_refs: Vec<&dyn rusqlite::ToSql> = params.iter().map(|p| p.as_ref()).collect();
    let total_count: i64 = conn.query_row(&count_sql, param_refs.as_slice(), |row| row.get(0))?;
    let total_count = total_count as usize;

    // Build ORDER BY
    let sort_column = match filters.sort {
        "created" => "i.created_at",
        "iid" => "i.iid",
        _ => "i.updated_at", // default
    };
    let order = if filters.order == "asc" {
        "ASC"
    } else {
        "DESC"
    };

    // Get issues with enriched data
    let query_sql = format!(
        "SELECT
            i.iid,
            i.title,
            i.state,
            i.author_username,
            i.created_at,
            i.updated_at,
            i.web_url,
            p.path_with_namespace,
            (SELECT GROUP_CONCAT(l.name, X'1F')
             FROM issue_labels il
             JOIN labels l ON il.label_id = l.id
             WHERE il.issue_id = i.id) AS labels_csv,
            (SELECT GROUP_CONCAT(ia.username, X'1F')
             FROM issue_assignees ia
             WHERE ia.issue_id = i.id) AS assignees_csv,
            COALESCE(d.total, 0) AS discussion_count,
            COALESCE(d.unresolved, 0) AS unresolved_count
         FROM issues i
         JOIN projects p ON i.project_id = p.id
         LEFT JOIN (
             SELECT issue_id,
                    COUNT(*) as total,
                    SUM(CASE WHEN resolvable = 1 AND resolved = 0 THEN 1 ELSE 0 END) as unresolved
             FROM discussions
             WHERE issue_id IS NOT NULL
             GROUP BY issue_id
         ) d ON d.issue_id = i.id
         {where_sql}
         ORDER BY {sort_column} {order}
         LIMIT ?"
    );

    params.push(Box::new(filters.limit as i64));
    let param_refs: Vec<&dyn rusqlite::ToSql> = params.iter().map(|p| p.as_ref()).collect();

    let mut stmt = conn.prepare(&query_sql)?;
    let issues: Vec<IssueListRow> = stmt
        .query_map(param_refs.as_slice(), |row| {
            let labels_csv: Option<String> = row.get(8)?;
            let labels = labels_csv
                .map(|s| s.split('\x1F').map(String::from).collect())
                .unwrap_or_default();

            let assignees_csv: Option<String> = row.get(9)?;
            let assignees = assignees_csv
                .map(|s| s.split('\x1F').map(String::from).collect())
                .unwrap_or_default();

            Ok(IssueListRow {
                iid: row.get(0)?,
                title: row.get(1)?,
                state: row.get(2)?,
                author_username: row.get(3)?,
                created_at: row.get(4)?,
                updated_at: row.get(5)?,
                web_url: row.get(6)?,
                project_path: row.get(7)?,
                labels,
                assignees,
                discussion_count: row.get(10)?,
                unresolved_count: row.get(11)?,
            })
        })?
        .collect::<std::result::Result<Vec<_>, _>>()?;

    Ok(ListResult {
        issues,
        total_count,
    })
}

/// Run the list MRs command.
pub fn run_list_mrs(config: &Config, filters: MrListFilters) -> Result<MrListResult> {
    let db_path = get_db_path(config.storage.db_path.as_deref());
    let conn = create_connection(&db_path)?;

    let result = query_mrs(&conn, &filters)?;
    Ok(result)
}

/// Query MRs from database with enriched data.
fn query_mrs(conn: &Connection, filters: &MrListFilters) -> Result<MrListResult> {
    // Build WHERE clause
    let mut where_clauses = Vec::new();
    let mut params: Vec<Box<dyn rusqlite::ToSql>> = Vec::new();

    if let Some(project) = filters.project {
        // Exact match or suffix match after '/' to avoid partial matches
        // e.g. "foo" matches "group/foo" but NOT "group/foobar"
        where_clauses.push("(p.path_with_namespace = ? OR p.path_with_namespace LIKE ?)");
        params.push(Box::new(project.to_string()));
        params.push(Box::new(format!("%/{project}")));
    }

    if let Some(state) = filters.state
        && state != "all"
    {
        where_clauses.push("m.state = ?");
        params.push(Box::new(state.to_string()));
    }

    // Handle author filter (strip leading @ if present)
    if let Some(author) = filters.author {
        let username = author.strip_prefix('@').unwrap_or(author);
        where_clauses.push("m.author_username = ?");
        params.push(Box::new(username.to_string()));
    }

    // Handle assignee filter (strip leading @ if present)
    if let Some(assignee) = filters.assignee {
        let username = assignee.strip_prefix('@').unwrap_or(assignee);
        where_clauses.push(
            "EXISTS (SELECT 1 FROM mr_assignees ma
             WHERE ma.merge_request_id = m.id AND ma.username = ?)",
        );
        params.push(Box::new(username.to_string()));
    }

    // Handle reviewer filter (strip leading @ if present)
    if let Some(reviewer) = filters.reviewer {
        let username = reviewer.strip_prefix('@').unwrap_or(reviewer);
        where_clauses.push(
            "EXISTS (SELECT 1 FROM mr_reviewers mr
             WHERE mr.merge_request_id = m.id AND mr.username = ?)",
        );
        params.push(Box::new(username.to_string()));
    }

    // Handle since filter
    if let Some(since_str) = filters.since
        && let Some(cutoff_ms) = parse_since(since_str)
    {
        where_clauses.push("m.updated_at >= ?");
        params.push(Box::new(cutoff_ms));
    }

    // Handle label filters (AND logic - all labels must be present)
    if let Some(labels) = filters.labels {
        for label in labels {
            where_clauses.push(
                "EXISTS (SELECT 1 FROM mr_labels ml
                 JOIN labels l ON ml.label_id = l.id
                 WHERE ml.merge_request_id = m.id AND l.name = ?)",
            );
            params.push(Box::new(label.clone()));
        }
    }

    // Handle draft filter
    if filters.draft {
        where_clauses.push("m.draft = 1");
    } else if filters.no_draft {
        where_clauses.push("m.draft = 0");
    }

    // Handle target branch filter
    if let Some(target_branch) = filters.target_branch {
        where_clauses.push("m.target_branch = ?");
        params.push(Box::new(target_branch.to_string()));
    }

    // Handle source branch filter
    if let Some(source_branch) = filters.source_branch {
        where_clauses.push("m.source_branch = ?");
        params.push(Box::new(source_branch.to_string()));
    }

    let where_sql = if where_clauses.is_empty() {
        String::new()
    } else {
        format!("WHERE {}", where_clauses.join(" AND "))
    };

    // Get total count
    let count_sql = format!(
        "SELECT COUNT(*) FROM merge_requests m
         JOIN projects p ON m.project_id = p.id
         {where_sql}"
    );

    let param_refs: Vec<&dyn rusqlite::ToSql> = params.iter().map(|p| p.as_ref()).collect();
    let total_count: i64 = conn.query_row(&count_sql, param_refs.as_slice(), |row| row.get(0))?;
    let total_count = total_count as usize;

    // Build ORDER BY
    let sort_column = match filters.sort {
        "created" => "m.created_at",
        "iid" => "m.iid",
        _ => "m.updated_at", // default
    };
    let order = if filters.order == "asc" {
        "ASC"
    } else {
        "DESC"
    };

    // Get MRs with enriched data
    let query_sql = format!(
        "SELECT
            m.iid,
            m.title,
            m.state,
            m.draft,
            m.author_username,
            m.source_branch,
            m.target_branch,
            m.created_at,
            m.updated_at,
            m.web_url,
            p.path_with_namespace,
            (SELECT GROUP_CONCAT(l.name, X'1F')
             FROM mr_labels ml
             JOIN labels l ON ml.label_id = l.id
             WHERE ml.merge_request_id = m.id) AS labels_csv,
            (SELECT GROUP_CONCAT(ma.username, X'1F')
             FROM mr_assignees ma
             WHERE ma.merge_request_id = m.id) AS assignees_csv,
            (SELECT GROUP_CONCAT(mr.username, X'1F')
             FROM mr_reviewers mr
             WHERE mr.merge_request_id = m.id) AS reviewers_csv,
            COALESCE(d.total, 0) AS discussion_count,
            COALESCE(d.unresolved, 0) AS unresolved_count
         FROM merge_requests m
         JOIN projects p ON m.project_id = p.id
         LEFT JOIN (
             SELECT merge_request_id,
                    COUNT(*) as total,
                    SUM(CASE WHEN resolvable = 1 AND resolved = 0 THEN 1 ELSE 0 END) as unresolved
             FROM discussions
             WHERE merge_request_id IS NOT NULL
             GROUP BY merge_request_id
         ) d ON d.merge_request_id = m.id
         {where_sql}
         ORDER BY {sort_column} {order}
         LIMIT ?"
    );

    params.push(Box::new(filters.limit as i64));
    let param_refs: Vec<&dyn rusqlite::ToSql> = params.iter().map(|p| p.as_ref()).collect();

    let mut stmt = conn.prepare(&query_sql)?;
    let mrs: Vec<MrListRow> = stmt
        .query_map(param_refs.as_slice(), |row| {
            let labels_csv: Option<String> = row.get(11)?;
            let labels = labels_csv
                .map(|s| s.split('\x1F').map(String::from).collect())
                .unwrap_or_default();

            let assignees_csv: Option<String> = row.get(12)?;
            let assignees = assignees_csv
                .map(|s| s.split('\x1F').map(String::from).collect())
                .unwrap_or_default();

            let reviewers_csv: Option<String> = row.get(13)?;
            let reviewers = reviewers_csv
                .map(|s| s.split('\x1F').map(String::from).collect())
                .unwrap_or_default();

            let draft_int: i64 = row.get(3)?;

            Ok(MrListRow {
                iid: row.get(0)?,
                title: row.get(1)?,
                state: row.get(2)?,
                draft: draft_int == 1,
                author_username: row.get(4)?,
                source_branch: row.get(5)?,
                target_branch: row.get(6)?,
                created_at: row.get(7)?,
                updated_at: row.get(8)?,
                web_url: row.get(9)?,
                project_path: row.get(10)?,
                labels,
                assignees,
                reviewers,
                discussion_count: row.get(14)?,
                unresolved_count: row.get(15)?,
            })
        })?
        .collect::<std::result::Result<Vec<_>, _>>()?;

    Ok(MrListResult { mrs, total_count })
}

/// Format relative time from ms epoch.
fn format_relative_time(ms_epoch: i64) -> String {
    let now = now_ms();
    let diff = now - ms_epoch;

    if diff < 0 {
        return "in the future".to_string();
    }

    match diff {
        d if d < 60_000 => "just now".to_string(),
        d if d < 3_600_000 => format!("{} min ago", d / 60_000),
        d if d < 86_400_000 => format!("{} hours ago", d / 3_600_000),
        d if d < 604_800_000 => format!("{} days ago", d / 86_400_000),
        d if d < 2_592_000_000 => format!("{} weeks ago", d / 604_800_000),
        _ => format!("{} months ago", diff / 2_592_000_000),
    }
}

/// Truncate string to max width with ellipsis.
fn truncate_with_ellipsis(s: &str, max_width: usize) -> String {
    if s.chars().count() <= max_width {
        s.to_string()
    } else {
        let truncated: String = s.chars().take(max_width.saturating_sub(3)).collect();
        format!("{truncated}...")
    }
}

/// Format labels for display: [bug, urgent +2]
fn format_labels(labels: &[String], max_shown: usize) -> String {
    if labels.is_empty() {
        return String::new();
    }

    let shown: Vec<&str> = labels.iter().take(max_shown).map(|s| s.as_str()).collect();
    let overflow = labels.len().saturating_sub(max_shown);

    if overflow > 0 {
        format!("[{} +{}]", shown.join(", "), overflow)
    } else {
        format!("[{}]", shown.join(", "))
    }
}

/// Format assignees for display: @user1, @user2 +1
fn format_assignees(assignees: &[String]) -> String {
    if assignees.is_empty() {
        return "-".to_string();
    }

    let max_shown = 2;
    let shown: Vec<String> = assignees
        .iter()
        .take(max_shown)
        .map(|s| format!("@{}", truncate_with_ellipsis(s, 10)))
        .collect();
    let overflow = assignees.len().saturating_sub(max_shown);

    if overflow > 0 {
        format!("{} +{}", shown.join(", "), overflow)
    } else {
        shown.join(", ")
    }
}

/// Format discussion count: "3/1!" (3 total, 1 unresolved)
fn format_discussions(total: i64, unresolved: i64) -> String {
    if total == 0 {
        return String::new();
    }

    if unresolved > 0 {
        format!("{total}/{unresolved}!")
    } else {
        format!("{total}")
    }
}

/// Format branch info: target <- source
fn format_branches(target: &str, source: &str, max_width: usize) -> String {
    let full = format!("{} <- {}", target, source);
    truncate_with_ellipsis(&full, max_width)
}

/// Print issues list as a formatted table.
pub fn print_list_issues(result: &ListResult) {
    if result.issues.is_empty() {
        println!("No issues found.");
        return;
    }

    println!(
        "Issues (showing {} of {})\n",
        result.issues.len(),
        result.total_count
    );

    let mut table = Table::new();
    table
        .set_content_arrangement(ContentArrangement::Dynamic)
        .set_header(vec![
            Cell::new("IID").add_attribute(Attribute::Bold),
            Cell::new("Title").add_attribute(Attribute::Bold),
            Cell::new("State").add_attribute(Attribute::Bold),
            Cell::new("Assignee").add_attribute(Attribute::Bold),
            Cell::new("Labels").add_attribute(Attribute::Bold),
            Cell::new("Disc").add_attribute(Attribute::Bold),
            Cell::new("Updated").add_attribute(Attribute::Bold),
        ]);

    for issue in &result.issues {
        let title = truncate_with_ellipsis(&issue.title, 45);
        let relative_time = format_relative_time(issue.updated_at);
        let labels = format_labels(&issue.labels, 2);
        let assignee = format_assignees(&issue.assignees);
        let discussions = format_discussions(issue.discussion_count, issue.unresolved_count);

        let state_cell = if issue.state == "opened" {
            Cell::new(&issue.state).fg(Color::Green)
        } else {
            Cell::new(&issue.state).fg(Color::DarkGrey)
        };

        table.add_row(vec![
            Cell::new(format!("#{}", issue.iid)).fg(Color::Cyan),
            Cell::new(title),
            state_cell,
            Cell::new(assignee).fg(Color::Magenta),
            Cell::new(labels).fg(Color::Yellow),
            Cell::new(discussions),
            Cell::new(relative_time).fg(Color::DarkGrey),
        ]);
    }

    println!("{table}");
}

/// Print issues list as JSON.
pub fn print_list_issues_json(result: &ListResult) {
    let json_result = ListResultJson::from(result);
    match serde_json::to_string_pretty(&json_result) {
        Ok(json) => println!("{json}"),
        Err(e) => eprintln!("Error serializing to JSON: {e}"),
    }
}

/// Open issue in browser. Returns the URL that was opened.
pub fn open_issue_in_browser(result: &ListResult) -> Option<String> {
    let first_issue = result.issues.first()?;
    let url = first_issue.web_url.as_ref()?;

    match open::that(url) {
        Ok(()) => {
            println!("Opened: {url}");
            Some(url.clone())
        }
        Err(e) => {
            eprintln!("Failed to open browser: {e}");
            None
        }
    }
}

/// Print MRs list as a formatted table.
pub fn print_list_mrs(result: &MrListResult) {
    if result.mrs.is_empty() {
        println!("No merge requests found.");
        return;
    }

    println!(
        "Merge Requests (showing {} of {})\n",
        result.mrs.len(),
        result.total_count
    );

    let mut table = Table::new();
    table
        .set_content_arrangement(ContentArrangement::Dynamic)
        .set_header(vec![
            Cell::new("IID").add_attribute(Attribute::Bold),
            Cell::new("Title").add_attribute(Attribute::Bold),
            Cell::new("State").add_attribute(Attribute::Bold),
            Cell::new("Author").add_attribute(Attribute::Bold),
            Cell::new("Branches").add_attribute(Attribute::Bold),
            Cell::new("Disc").add_attribute(Attribute::Bold),
            Cell::new("Updated").add_attribute(Attribute::Bold),
        ]);

    for mr in &result.mrs {
        // Add [DRAFT] prefix for draft MRs
        let title = if mr.draft {
            format!("[DRAFT] {}", truncate_with_ellipsis(&mr.title, 38))
        } else {
            truncate_with_ellipsis(&mr.title, 45)
        };

        let relative_time = format_relative_time(mr.updated_at);
        let branches = format_branches(&mr.target_branch, &mr.source_branch, 25);
        let discussions = format_discussions(mr.discussion_count, mr.unresolved_count);

        let state_cell = match mr.state.as_str() {
            "opened" => Cell::new(&mr.state).fg(Color::Green),
            "merged" => Cell::new(&mr.state).fg(Color::Magenta),
            "closed" => Cell::new(&mr.state).fg(Color::Red),
            "locked" => Cell::new(&mr.state).fg(Color::Yellow),
            _ => Cell::new(&mr.state).fg(Color::DarkGrey),
        };

        table.add_row(vec![
            Cell::new(format!("!{}", mr.iid)).fg(Color::Cyan),
            Cell::new(title),
            state_cell,
            Cell::new(format!(
                "@{}",
                truncate_with_ellipsis(&mr.author_username, 12)
            ))
            .fg(Color::Magenta),
            Cell::new(branches).fg(Color::Blue),
            Cell::new(discussions),
            Cell::new(relative_time).fg(Color::DarkGrey),
        ]);
    }

    println!("{table}");
}

/// Print MRs list as JSON.
pub fn print_list_mrs_json(result: &MrListResult) {
    let json_result = MrListResultJson::from(result);
    match serde_json::to_string_pretty(&json_result) {
        Ok(json) => println!("{json}"),
        Err(e) => eprintln!("Error serializing to JSON: {e}"),
    }
}

/// Open MR in browser. Returns the URL that was opened.
pub fn open_mr_in_browser(result: &MrListResult) -> Option<String> {
    let first_mr = result.mrs.first()?;
    let url = first_mr.web_url.as_ref()?;

    match open::that(url) {
        Ok(()) => {
            println!("Opened: {url}");
            Some(url.clone())
        }
        Err(e) => {
            eprintln!("Failed to open browser: {e}");
            None
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn truncate_leaves_short_strings_alone() {
        assert_eq!(truncate_with_ellipsis("short", 10), "short");
    }

    #[test]
    fn truncate_adds_ellipsis_to_long_strings() {
        assert_eq!(
            truncate_with_ellipsis("this is a very long title", 15),
            "this is a ve..."
        );
    }

    #[test]
    fn truncate_handles_exact_length() {
        assert_eq!(truncate_with_ellipsis("exactly10!", 10), "exactly10!");
    }

    #[test]
    fn relative_time_formats_correctly() {
        let now = now_ms();

        assert_eq!(format_relative_time(now - 30_000), "just now"); // 30s ago
        assert_eq!(format_relative_time(now - 120_000), "2 min ago"); // 2 min ago
        assert_eq!(format_relative_time(now - 7_200_000), "2 hours ago"); // 2 hours ago
        assert_eq!(format_relative_time(now - 172_800_000), "2 days ago"); // 2 days ago
    }

    #[test]
    fn format_labels_empty() {
        assert_eq!(format_labels(&[], 2), "");
    }

    #[test]
    fn format_labels_single() {
        assert_eq!(format_labels(&["bug".to_string()], 2), "[bug]");
    }

    #[test]
    fn format_labels_multiple() {
        let labels = vec!["bug".to_string(), "urgent".to_string()];
        assert_eq!(format_labels(&labels, 2), "[bug, urgent]");
    }

    #[test]
    fn format_labels_overflow() {
        let labels = vec![
            "bug".to_string(),
            "urgent".to_string(),
            "wip".to_string(),
            "blocked".to_string(),
        ];
        assert_eq!(format_labels(&labels, 2), "[bug, urgent +2]");
    }

    #[test]
    fn format_discussions_empty() {
        assert_eq!(format_discussions(0, 0), "");
    }

    #[test]
    fn format_discussions_no_unresolved() {
        assert_eq!(format_discussions(5, 0), "5");
    }

    #[test]
    fn format_discussions_with_unresolved() {
        assert_eq!(format_discussions(5, 2), "5/2!");
    }
}