"""Database migrations — schema versioning."""

SCHEMA_VERSION = 1

MIGRATIONS = {
    1: """
    CREATE TABLE IF NOT EXISTS users (
        id TEXT PRIMARY KEY,
        username TEXT UNIQUE NOT NULL,
        display_name TEXT,
        email TEXT,
        avatar_url TEXT,
        preferences TEXT DEFAULT '{}',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    );

    CREATE TABLE IF NOT EXISTS conversations (
        id TEXT PRIMARY KEY,
        user_id TEXT,
        title TEXT DEFAULT 'New Chat',
        folder_id TEXT,
        personality_id TEXT DEFAULT 'synapse',
        mode TEXT DEFAULT 'agent',
        is_pinned INTEGER DEFAULT 0,
        is_bookmarked INTEGER DEFAULT 0,
        summary TEXT,
        metadata TEXT DEFAULT '{}',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
    );

    CREATE TABLE IF NOT EXISTS messages (
        id TEXT PRIMARY KEY,
        conversation_id TEXT NOT NULL,
        role TEXT NOT NULL CHECK(role IN ('user','assistant','system','tool')),
        content TEXT NOT NULL,
        reasoning TEXT,
        tool_calls TEXT,
        tool_results TEXT,
        model TEXT,
        tokens_used INTEGER DEFAULT 0,
        metadata TEXT DEFAULT '{}',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (conversation_id) REFERENCES conversations(id) ON DELETE CASCADE
    );

    CREATE TABLE IF NOT EXISTS folders (
        id TEXT PRIMARY KEY,
        user_id TEXT,
        name TEXT NOT NULL,
        parent_id TEXT,
        color TEXT DEFAULT '#6366f1',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
    );

    CREATE TABLE IF NOT EXISTS memories (
        id TEXT PRIMARY KEY,
        user_id TEXT,
        conversation_id TEXT,
        content TEXT NOT NULL,
        memory_type TEXT DEFAULT 'long_term',
        importance REAL DEFAULT 0.5,
        embedding BLOB,
        is_pinned INTEGER DEFAULT 0,
        tags TEXT DEFAULT '[]',
        metadata TEXT DEFAULT '{}',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        accessed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
    );

    CREATE TABLE IF NOT EXISTS user_facts (
        id TEXT PRIMARY KEY,
        user_id TEXT NOT NULL,
        fact TEXT NOT NULL,
        category TEXT DEFAULT 'general',
        confidence REAL DEFAULT 1.0,
        source TEXT,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
    );

    CREATE TABLE IF NOT EXISTS personalities (
        id TEXT PRIMARY KEY,
        name TEXT NOT NULL,
        system_prompt TEXT NOT NULL,
        description TEXT,
        mood TEXT DEFAULT 'neutral',
        humor_level REAL DEFAULT 0.5,
        creativity_level REAL DEFAULT 0.7,
        is_default INTEGER DEFAULT 0,
        avatar_url TEXT,
        metadata TEXT DEFAULT '{}',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    );

    CREATE TABLE IF NOT EXISTS chat_history (
        id TEXT PRIMARY KEY,
        user_id TEXT,
        conversation_id TEXT NOT NULL,
        action TEXT NOT NULL,
        old_value TEXT,
        new_value TEXT,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (conversation_id) REFERENCES conversations(id) ON DELETE CASCADE
    );

    CREATE TABLE IF NOT EXISTS plugins (
        id TEXT PRIMARY KEY,
        name TEXT NOT NULL UNIQUE,
        description TEXT,
        version TEXT DEFAULT '1.0.0',
        author TEXT,
        enabled INTEGER DEFAULT 1,
        config TEXT DEFAULT '{}',
        tools TEXT DEFAULT '[]',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    );

    CREATE TABLE IF NOT EXISTS generated_files (
        id TEXT PRIMARY KEY,
        user_id TEXT,
        file_type TEXT NOT NULL,
        file_path TEXT NOT NULL,
        original_prompt TEXT,
        metadata TEXT DEFAULT '{}',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
    );

    CREATE TABLE IF NOT EXISTS sessions (
        id TEXT PRIMARY KEY,
        user_id TEXT,
        token TEXT UNIQUE NOT NULL,
        ip_address TEXT,
        user_agent TEXT,
        expires_at TIMESTAMP,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
    );

    CREATE TABLE IF NOT EXISTS settings (
        user_id TEXT,
        key TEXT NOT NULL,
        value TEXT,
        PRIMARY KEY (user_id, key),
        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
    );

    CREATE TABLE IF NOT EXISTS migrations (
        version INTEGER PRIMARY KEY,
        applied_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    );

    CREATE INDEX IF NOT EXISTS idx_messages_conversation ON messages(conversation_id);
    CREATE INDEX IF NOT EXISTS idx_messages_role ON messages(role);
    CREATE INDEX IF NOT EXISTS idx_conversations_user ON conversations(user_id);
    CREATE INDEX IF NOT EXISTS idx_memories_user ON memories(user_id);
    CREATE INDEX IF NOT EXISTS idx_memories_type ON memories(memory_type);
    CREATE INDEX IF NOT EXISTS idx_generated_files_user ON generated_files(user_id);
    CREATE INDEX IF NOT EXISTS idx_chat_history_conversation ON chat_history(conversation_id);
    """,
}


async def run_migrations(db):
    await db.execute("""
        CREATE TABLE IF NOT EXISTS migrations (
            version INTEGER PRIMARY KEY,
            applied_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )
    """)
    await db.commit()
    cursor = await db.execute(
        "SELECT version FROM migrations ORDER BY version DESC LIMIT 1"
    )
    row = await cursor.fetchone()
    current_version = row[0] if row else 0

    for version, sql in sorted(MIGRATIONS.items()):
        if version > current_version:
            await db.executescript(sql)
            await db.execute(
                "INSERT INTO migrations (version) VALUES (?)", (version,)
            )
            await db.commit()