const LIVE_PROJECTION_COLUMNS = {
    logical_channel_id: 'TEXT',
    grouping_fingerprint: 'TEXT',
    grouping_input_hash: 'TEXT',
    quality_label: 'TEXT',
    quality_rank: 'INTEGER',
    variant_rank: 'INTEGER',
    language_code: 'TEXT',
    language_confidence: 'REAL',
    language_scores: 'JSON',
    language_evidence: 'JSON',
    language_detector: 'TEXT',
    language_input_hash: 'TEXT'
};

const CATALOG_PROJECTION_STATE_COLUMNS = {
    phase: "TEXT NOT NULL DEFAULT 'idle'",
    processed_count: 'INTEGER NOT NULL DEFAULT 0',
    total_count: 'INTEGER NOT NULL DEFAULT 0',
    laya_processed_count: 'INTEGER NOT NULL DEFAULT 0',
    laya_total_count: 'INTEGER NOT NULL DEFAULT 0'
};

const LIVE_PROJECTION_SCHEMA_SQL = `
    CREATE INDEX IF NOT EXISTS idx_items_logical_channel ON playlist_items(logical_channel_id);
    CREATE INDEX IF NOT EXISTS idx_items_grouping_fingerprint ON playlist_items(grouping_fingerprint);

    CREATE TABLE IF NOT EXISTS logical_channels (
        id TEXT PRIMARY KEY,
        fingerprint TEXT NOT NULL UNIQUE,
        display_name TEXT NOT NULL,
        preferred_variant_id TEXT,
        variant_count INTEGER NOT NULL DEFAULT 0,
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL
    );
    CREATE INDEX IF NOT EXISTS idx_logical_channels_fingerprint ON logical_channels(fingerprint);

    CREATE TABLE IF NOT EXISTS iptv_org_channels (
        id TEXT PRIMARY KEY,
        name TEXT NOT NULL,
        normalized_name TEXT NOT NULL,
        alt_names JSON NOT NULL DEFAULT '[]',
        country TEXT,
        languages JSON NOT NULL DEFAULT '[]',
        data JSON,
        updated_at INTEGER NOT NULL
    );
    CREATE INDEX IF NOT EXISTS idx_iptv_org_channels_name ON iptv_org_channels(normalized_name);

    CREATE TABLE IF NOT EXISTS iptv_org_cache_state (
        resource TEXT PRIMARY KEY,
        refreshed_at INTEGER NOT NULL,
        item_count INTEGER NOT NULL DEFAULT 0
    );

    CREATE TABLE IF NOT EXISTS live_epg_matches (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        logical_channel_id TEXT NOT NULL,
        language_code TEXT NOT NULL,
        source_id INTEGER,
        channel_id TEXT,
        match_confidence REAL NOT NULL DEFAULT 0,
        data JSON,
        updated_at INTEGER NOT NULL,
        UNIQUE (logical_channel_id, language_code)
    );
    CREATE INDEX IF NOT EXISTS idx_live_epg_matches_channel
        ON live_epg_matches(logical_channel_id, language_code);

    CREATE TABLE IF NOT EXISTS catalog_projection_state (
        projection TEXT PRIMARY KEY,
        status TEXT NOT NULL,
        started_at INTEGER,
        completed_at INTEGER,
        input_hash TEXT,
        projected_count INTEGER NOT NULL DEFAULT 0,
        phase TEXT NOT NULL DEFAULT 'idle',
        processed_count INTEGER NOT NULL DEFAULT 0,
        total_count INTEGER NOT NULL DEFAULT 0,
        laya_processed_count INTEGER NOT NULL DEFAULT 0,
        laya_total_count INTEGER NOT NULL DEFAULT 0,
        error TEXT
    );
`;

function ensureColumns(database, table, columns) {
    const existing = new Set(database.prepare(`PRAGMA table_info(${table})`).all().map(column => column.name));
    for (const [name, definition] of Object.entries(columns)) {
        if (!existing.has(name)) database.exec(`ALTER TABLE ${table} ADD COLUMN ${name} ${definition}`);
    }
}

module.exports = {
    CATALOG_PROJECTION_STATE_COLUMNS,
    ensureColumns,
    LIVE_PROJECTION_COLUMNS,
    LIVE_PROJECTION_SCHEMA_SQL
};