use rusqlite::Connection;

use super::errors::DatabaseError;

const CURRENT_SCHEMA_VERSION: i32 = 1;

pub fn create_tables(conn: &Connection) -> Result<(), DatabaseError> {
    conn.execute_batch(
        "
        CREATE TABLE IF NOT EXISTS schema_version (
            version INTEGER NOT NULL
        );

        CREATE TABLE IF NOT EXISTS projects (
            id          TEXT PRIMARY KEY,
            name        TEXT NOT NULL,
            created_at  TEXT NOT NULL,
            updated_at  TEXT NOT NULL,
            settings    TEXT,
            status      TEXT NOT NULL DEFAULT 'active'
        );

        CREATE TABLE IF NOT EXISTS media_files (
            id          TEXT PRIMARY KEY,
            project_id  TEXT NOT NULL REFERENCES projects(id),
            file_path   TEXT NOT NULL,
            file_hash   TEXT,
            duration_ms INTEGER,
            sample_rate INTEGER,
            channels    INTEGER,
            format      TEXT,
            file_size   INTEGER,
            created_at  TEXT NOT NULL
        );

        CREATE TABLE IF NOT EXISTS speakers (
            id           TEXT PRIMARY KEY,
            project_id   TEXT NOT NULL REFERENCES projects(id),
            label        TEXT NOT NULL,
            display_name TEXT,
            color        TEXT,
            metadata     TEXT
        );

        CREATE TABLE IF NOT EXISTS segments (
            id            TEXT PRIMARY KEY,
            project_id    TEXT NOT NULL REFERENCES projects(id),
            media_file_id TEXT NOT NULL REFERENCES media_files(id),
            speaker_id    TEXT REFERENCES speakers(id),
            start_ms      INTEGER NOT NULL,
            end_ms        INTEGER NOT NULL,
            text          TEXT NOT NULL,
            original_text TEXT,
            confidence    REAL,
            is_edited     INTEGER NOT NULL DEFAULT 0,
            edited_at     TEXT,
            segment_index INTEGER NOT NULL
        );

        CREATE TABLE IF NOT EXISTS words (
            id         TEXT PRIMARY KEY,
            segment_id TEXT NOT NULL REFERENCES segments(id),
            word       TEXT NOT NULL,
            start_ms   INTEGER NOT NULL,
            end_ms     INTEGER NOT NULL,
            confidence REAL,
            word_index INTEGER NOT NULL
        );

        CREATE TABLE IF NOT EXISTS ai_outputs (
            id          TEXT PRIMARY KEY,
            project_id  TEXT NOT NULL REFERENCES projects(id),
            output_type TEXT NOT NULL,
            prompt      TEXT,
            content     TEXT NOT NULL,
            provider    TEXT,
            created_at  TEXT NOT NULL,
            metadata    TEXT
        );

        CREATE TABLE IF NOT EXISTS annotations (
            id         TEXT PRIMARY KEY,
            project_id TEXT NOT NULL REFERENCES projects(id),
            start_ms   INTEGER NOT NULL,
            end_ms     INTEGER,
            text       TEXT NOT NULL,
            type       TEXT NOT NULL DEFAULT 'bookmark'
        );

        CREATE INDEX IF NOT EXISTS idx_segments_project ON segments(project_id, segment_index);
        CREATE INDEX IF NOT EXISTS idx_segments_time ON segments(media_file_id, start_ms);
        CREATE INDEX IF NOT EXISTS idx_words_segment ON words(segment_id, word_index);
        CREATE INDEX IF NOT EXISTS idx_words_time ON words(start_ms, end_ms);
        CREATE INDEX IF NOT EXISTS idx_ai_outputs_project ON ai_outputs(project_id, output_type);
        ",
    )?;

    // Initialize schema version if empty
    let count: i32 = conn.query_row(
        "SELECT COUNT(*) FROM schema_version",
        [],
        |row| row.get(0),
    )?;
    if count == 0 {
        conn.execute(
            "INSERT INTO schema_version (version) VALUES (?1)",
            [CURRENT_SCHEMA_VERSION],
        )?;
    }

    Ok(())
}

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

    #[test]
    fn test_create_tables_idempotent() {
        let conn = Connection::open_in_memory().unwrap();
        conn.pragma_update(None, "foreign_keys", "ON").unwrap();
        create_tables(&conn).unwrap();
        // Running again should be fine (IF NOT EXISTS)
        create_tables(&conn).unwrap();
    }

    #[test]
    fn test_schema_version() {
        let conn = Connection::open_in_memory().unwrap();
        create_tables(&conn).unwrap();
        let version: i32 = conn
            .query_row("SELECT version FROM schema_version", [], |row| row.get(0))
            .unwrap();
        assert_eq!(version, CURRENT_SCHEMA_VERSION);
    }
}