use super::*;
use crate::core::db::{create_connection, run_migrations};
use crate::gitlab::transformers::NormalizedNote;
use std::path::Path;

#[test]
fn result_default_has_zero_counts() {
    let result = IngestDiscussionsResult::default();
    assert_eq!(result.discussions_fetched, 0);
    assert_eq!(result.discussions_upserted, 0);
    assert_eq!(result.notes_upserted, 0);
}

fn setup() -> Connection {
    let conn = create_connection(Path::new(":memory:")).unwrap();
    run_migrations(&conn).unwrap();

    conn.execute(
        "INSERT INTO projects (gitlab_project_id, path_with_namespace, web_url) \
         VALUES (1, 'group/repo', 'https://gitlab.com/group/repo')",
        [],
    )
    .unwrap();

    conn.execute(
        "INSERT INTO issues (gitlab_id, iid, project_id, title, state, author_username, created_at, updated_at, last_seen_at) \
         VALUES (100, 1, 1, 'Test Issue', 'opened', 'testuser', 1000, 2000, 3000)",
        [],
    )
    .unwrap();

    conn.execute(
        "INSERT INTO discussions (gitlab_discussion_id, project_id, issue_id, noteable_type, individual_note, last_seen_at, resolvable, resolved) \
         VALUES ('disc-1', 1, 1, 'Issue', 0, 3000, 0, 0)",
        [],
    )
    .unwrap();

    conn
}

fn get_discussion_id(conn: &Connection) -> i64 {
    conn.query_row(
        "SELECT id FROM discussions ORDER BY id LIMIT 1",
        [],
        |row| row.get(0),
    )
    .unwrap()
}

#[allow(clippy::too_many_arguments)]
fn make_note(
    gitlab_id: i64,
    project_id: i64,
    body: &str,
    note_type: Option<&str>,
    created_at: i64,
    updated_at: i64,
    resolved: bool,
    resolved_by: Option<&str>,
) -> NormalizedNote {
    NormalizedNote {
        gitlab_id,
        project_id,
        note_type: note_type.map(String::from),
        is_system: false,
        author_id: None,
        author_username: "testuser".to_string(),
        body: body.to_string(),
        created_at,
        updated_at,
        last_seen_at: updated_at,
        position: 0,
        resolvable: false,
        resolved,
        resolved_by: resolved_by.map(String::from),
        resolved_at: None,
        position_old_path: None,
        position_new_path: None,
        position_old_line: None,
        position_new_line: None,
        position_type: None,
        position_line_range_start: None,
        position_line_range_end: None,
        position_base_sha: None,
        position_start_sha: None,
        position_head_sha: None,
    }
}

#[test]
fn test_issue_note_upsert_stable_id() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);
    let last_seen_at = 5000;

    let note1 = make_note(1001, 1, "First note", None, 1000, 2000, false, None);
    let note2 = make_note(1002, 1, "Second note", None, 1000, 2000, false, None);

    let out1 = upsert_note_for_issue(&conn, disc_id, &note1, last_seen_at, None).unwrap();
    let out2 = upsert_note_for_issue(&conn, disc_id, &note2, last_seen_at, None).unwrap();
    let id1 = out1.local_note_id;
    let id2 = out2.local_note_id;

    // Re-sync same gitlab_ids
    let out1b = upsert_note_for_issue(&conn, disc_id, &note1, last_seen_at + 1, None).unwrap();
    let out2b = upsert_note_for_issue(&conn, disc_id, &note2, last_seen_at + 1, None).unwrap();

    assert_eq!(id1, out1b.local_note_id);
    assert_eq!(id2, out2b.local_note_id);
}

#[test]
fn test_issue_note_upsert_detects_body_change() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    let note = make_note(2001, 1, "Original body", None, 1000, 2000, false, None);
    upsert_note_for_issue(&conn, disc_id, &note, 5000, None).unwrap();

    let mut changed = make_note(2001, 1, "Updated body", None, 1000, 3000, false, None);
    changed.updated_at = 3000;
    let outcome = upsert_note_for_issue(&conn, disc_id, &changed, 5001, None).unwrap();
    assert!(outcome.changed_semantics);
}

#[test]
fn test_issue_note_upsert_unchanged_returns_false() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    let note = make_note(3001, 1, "Same body", None, 1000, 2000, false, None);
    upsert_note_for_issue(&conn, disc_id, &note, 5000, None).unwrap();

    // Re-sync identical note
    let outcome = upsert_note_for_issue(&conn, disc_id, &note, 5001, None).unwrap();
    assert!(!outcome.changed_semantics);
}

#[test]
fn test_issue_note_upsert_updated_at_only_does_not_mark_semantic_change() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    let note = make_note(4001, 1, "Body stays", None, 1000, 2000, false, None);
    upsert_note_for_issue(&conn, disc_id, &note, 5000, None).unwrap();

    // Only change updated_at (non-semantic field)
    let mut same = make_note(4001, 1, "Body stays", None, 1000, 9999, false, None);
    same.updated_at = 9999;
    let outcome = upsert_note_for_issue(&conn, disc_id, &same, 5001, None).unwrap();
    assert!(!outcome.changed_semantics);
}

#[test]
fn test_issue_note_sweep_removes_stale() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    let note1 = make_note(5001, 1, "Keep me", None, 1000, 2000, false, None);
    let note2 = make_note(5002, 1, "Stale me", None, 1000, 2000, false, None);

    upsert_note_for_issue(&conn, disc_id, &note1, 5000, None).unwrap();
    upsert_note_for_issue(&conn, disc_id, &note2, 5000, None).unwrap();

    // Re-sync only note1 with newer timestamp
    upsert_note_for_issue(&conn, disc_id, &note1, 6000, None).unwrap();

    // Sweep should remove note2 (last_seen_at=5000 < 6000)
    let swept = sweep_stale_issue_notes(&conn, disc_id, 6000).unwrap();
    assert_eq!(swept, 1);

    let count: i64 = conn
        .query_row(
            "SELECT COUNT(*) FROM notes WHERE discussion_id = ?",
            [disc_id],
            |row| row.get(0),
        )
        .unwrap();
    assert_eq!(count, 1);
}

#[test]
fn test_issue_note_upsert_returns_local_id() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    let note = make_note(6001, 1, "Check my ID", None, 1000, 2000, false, None);
    let outcome = upsert_note_for_issue(&conn, disc_id, &note, 5000, None).unwrap();

    // Verify the local_note_id matches what's in the DB
    let db_id: i64 = conn
        .query_row(
            "SELECT id FROM notes WHERE gitlab_id = ?",
            [6001_i64],
            |row| row.get(0),
        )
        .unwrap();
    assert_eq!(outcome.local_note_id, db_id);
}

#[test]
fn test_issue_note_upsert_captures_author_id() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    let mut note = make_note(7001, 1, "With author", None, 1000, 2000, false, None);
    note.author_id = Some(12345);

    upsert_note_for_issue(&conn, disc_id, &note, 5000, None).unwrap();

    let stored: Option<i64> = conn
        .query_row(
            "SELECT author_id FROM notes WHERE gitlab_id = ?",
            [7001_i64],
            |row| row.get(0),
        )
        .unwrap();
    assert_eq!(stored, Some(12345));
}

#[test]
fn test_note_upsert_author_id_nullable() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    let note = make_note(7002, 1, "No author id", None, 1000, 2000, false, None);
    // author_id defaults to None in make_note

    upsert_note_for_issue(&conn, disc_id, &note, 5000, None).unwrap();

    let stored: Option<i64> = conn
        .query_row(
            "SELECT author_id FROM notes WHERE gitlab_id = ?",
            [7002_i64],
            |row| row.get(0),
        )
        .unwrap();
    assert_eq!(stored, None);
}

#[test]
fn test_note_author_id_survives_username_change() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    let mut note = make_note(7003, 1, "Original body", None, 1000, 2000, false, None);
    note.author_id = Some(99999);
    note.author_username = "oldname".to_string();

    upsert_note_for_issue(&conn, disc_id, &note, 5000, None).unwrap();

    // Re-sync with changed username, changed body, same author_id
    let mut updated = make_note(7003, 1, "Updated body", None, 1000, 3000, false, None);
    updated.author_id = Some(99999);
    updated.author_username = "newname".to_string();

    upsert_note_for_issue(&conn, disc_id, &updated, 5001, None).unwrap();

    // author_id must survive the re-sync intact
    let stored_id: Option<i64> = conn
        .query_row(
            "SELECT author_id FROM notes WHERE gitlab_id = ?",
            [7003_i64],
            |row| row.get(0),
        )
        .unwrap();
    assert_eq!(stored_id, Some(99999));
}

fn insert_note_document(conn: &Connection, note_local_id: i64) {
    conn.execute(
        "INSERT INTO documents (source_type, source_id, project_id, content_text, content_hash) \
         VALUES ('note', ?1, 1, 'note content', 'hash123')",
        [note_local_id],
    )
    .unwrap();
}

fn insert_note_dirty_source(conn: &Connection, note_local_id: i64) {
    conn.execute(
        "INSERT INTO dirty_sources (source_type, source_id, queued_at) \
         VALUES ('note', ?1, 1000)",
        [note_local_id],
    )
    .unwrap();
}

fn count_note_documents(conn: &Connection, note_local_id: i64) -> i64 {
    conn.query_row(
        "SELECT COUNT(*) FROM documents WHERE source_type = 'note' AND source_id = ?",
        [note_local_id],
        |row| row.get(0),
    )
    .unwrap()
}

fn count_note_dirty_sources(conn: &Connection, note_local_id: i64) -> i64 {
    conn.query_row(
        "SELECT COUNT(*) FROM dirty_sources WHERE source_type = 'note' AND source_id = ?",
        [note_local_id],
        |row| row.get(0),
    )
    .unwrap()
}

#[test]
fn test_issue_note_sweep_deletes_note_documents_immediately() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    // Insert 3 notes
    let note1 = make_note(9001, 1, "Keep me", None, 1000, 2000, false, None);
    let note2 = make_note(9002, 1, "Keep me too", None, 1000, 2000, false, None);
    let note3 = make_note(9003, 1, "Stale me", None, 1000, 2000, false, None);

    let out1 = upsert_note_for_issue(&conn, disc_id, &note1, 5000, None).unwrap();
    let out2 = upsert_note_for_issue(&conn, disc_id, &note2, 5000, None).unwrap();
    let out3 = upsert_note_for_issue(&conn, disc_id, &note3, 5000, None).unwrap();

    // Add documents for all 3
    insert_note_document(&conn, out1.local_note_id);
    insert_note_document(&conn, out2.local_note_id);
    insert_note_document(&conn, out3.local_note_id);

    // Add dirty_sources for note3
    insert_note_dirty_source(&conn, out3.local_note_id);

    // Re-sync only notes 1 and 2 with newer timestamp
    upsert_note_for_issue(&conn, disc_id, &note1, 6000, None).unwrap();
    upsert_note_for_issue(&conn, disc_id, &note2, 6000, None).unwrap();

    // Sweep should remove note3 and its document + dirty_source
    sweep_stale_issue_notes(&conn, disc_id, 6000).unwrap();

    // Stale note's document should be gone
    assert_eq!(count_note_documents(&conn, out3.local_note_id), 0);
    assert_eq!(count_note_dirty_sources(&conn, out3.local_note_id), 0);

    // Kept notes' documents should survive
    assert_eq!(count_note_documents(&conn, out1.local_note_id), 1);
    assert_eq!(count_note_documents(&conn, out2.local_note_id), 1);
}

#[test]
fn test_sweep_deletion_handles_note_without_document() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    let note = make_note(9004, 1, "No doc", None, 1000, 2000, false, None);
    upsert_note_for_issue(&conn, disc_id, &note, 5000, None).unwrap();

    // Don't insert any document -- sweep should still work without error
    let swept = sweep_stale_issue_notes(&conn, disc_id, 6000).unwrap();
    assert_eq!(swept, 1);
}

#[test]
fn test_set_based_deletion_atomicity() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    // Insert a stale note with both document and dirty_source
    let note = make_note(9005, 1, "Stale with deps", None, 1000, 2000, false, None);
    let out = upsert_note_for_issue(&conn, disc_id, &note, 5000, None).unwrap();
    insert_note_document(&conn, out.local_note_id);
    insert_note_dirty_source(&conn, out.local_note_id);

    // Verify they exist before sweep
    assert_eq!(count_note_documents(&conn, out.local_note_id), 1);
    assert_eq!(count_note_dirty_sources(&conn, out.local_note_id), 1);

    // The sweep function already runs inside a transaction (called from
    // ingest_discussions_for_issue's tx). Simulate by wrapping in a transaction.
    let tx = conn.unchecked_transaction().unwrap();
    sweep_stale_issue_notes(&tx, disc_id, 6000).unwrap();
    tx.commit().unwrap();

    // All three DELETEs must have happened
    assert_eq!(count_note_documents(&conn, out.local_note_id), 0);
    assert_eq!(count_note_dirty_sources(&conn, out.local_note_id), 0);

    let note_count: i64 = conn
        .query_row(
            "SELECT COUNT(*) FROM notes WHERE gitlab_id = ?",
            [9005_i64],
            |row| row.get(0),
        )
        .unwrap();
    assert_eq!(note_count, 0);
}

fn count_dirty_notes(conn: &Connection) -> i64 {
    conn.query_row(
        "SELECT COUNT(*) FROM dirty_sources WHERE source_type = 'note'",
        [],
        |row| row.get(0),
    )
    .unwrap()
}

#[test]
fn test_parent_title_change_marks_notes_dirty() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    // Insert two user notes and one system note
    let note1 = make_note(10001, 1, "User note 1", None, 1000, 2000, false, None);
    let note2 = make_note(10002, 1, "User note 2", None, 1000, 2000, false, None);
    let mut sys_note = make_note(10003, 1, "System note", None, 1000, 2000, false, None);
    sys_note.is_system = true;

    let out1 = upsert_note_for_issue(&conn, disc_id, &note1, 5000, None).unwrap();
    let out2 = upsert_note_for_issue(&conn, disc_id, &note2, 5000, None).unwrap();
    upsert_note_for_issue(&conn, disc_id, &sys_note, 5000, None).unwrap();

    // Clear any dirty_sources from individual note upserts
    conn.execute("DELETE FROM dirty_sources WHERE source_type = 'note'", [])
        .unwrap();
    assert_eq!(count_dirty_notes(&conn), 0);

    // Simulate parent title change triggering discussion re-ingest:
    // update the issue title, then run the propagation SQL
    conn.execute("UPDATE issues SET title = 'Changed Title' WHERE id = 1", [])
        .unwrap();

    // Run the propagation query (same as in ingestion code)
    conn.execute(
        "INSERT INTO dirty_sources (source_type, source_id, queued_at)
         SELECT 'note', n.id, ?1
         FROM notes n
         WHERE n.discussion_id = ?2 AND n.is_system = 0
         ON CONFLICT(source_type, source_id) DO UPDATE SET queued_at = excluded.queued_at, attempt_count = 0",
        params![now_ms(), disc_id],
    )
    .unwrap();

    // Both user notes should be dirty, system note should not
    assert_eq!(count_dirty_notes(&conn), 2);
    assert_eq!(count_note_dirty_sources(&conn, out1.local_note_id), 1);
    assert_eq!(count_note_dirty_sources(&conn, out2.local_note_id), 1);
}

#[test]
fn test_parent_label_change_marks_notes_dirty() {
    let conn = setup();
    let disc_id = get_discussion_id(&conn);

    // Insert one user note
    let note = make_note(11001, 1, "User note", None, 1000, 2000, false, None);
    let out = upsert_note_for_issue(&conn, disc_id, &note, 5000, None).unwrap();

    // Clear dirty_sources
    conn.execute("DELETE FROM dirty_sources WHERE source_type = 'note'", [])
        .unwrap();

    // Simulate label change on parent issue (labels are part of issue metadata)
    conn.execute("UPDATE issues SET updated_at = 9999 WHERE id = 1", [])
        .unwrap();

    // Run propagation query
    conn.execute(
        "INSERT INTO dirty_sources (source_type, source_id, queued_at)
         SELECT 'note', n.id, ?1
         FROM notes n
         WHERE n.discussion_id = ?2 AND n.is_system = 0
         ON CONFLICT(source_type, source_id) DO UPDATE SET queued_at = excluded.queued_at, attempt_count = 0",
        params![now_ms(), disc_id],
    )
    .unwrap();

    assert_eq!(count_dirty_notes(&conn), 1);
    assert_eq!(count_note_dirty_sources(&conn, out.local_note_id), 1);
}
