"""Database migration runner using asyncpg.

Applies all SQL migration files from infra/migrations/ in sorted order.
Each file is split on semicolons and executed statement-by-statement.
Idempotent — migrations use IF NOT EXISTS / CREATE OR REPLACE patterns.

Usage:
    python -m services.shared.migrate
"""
import asyncio
import glob
import logging
import os
import sys

import asyncpg

logger = logging.getLogger("migrate")


async def run_migrations() -> None:
    host = os.getenv("POSTGRES_HOST", "localhost")
    port = int(os.getenv("POSTGRES_PORT", "5432"))
    user = os.getenv("POSTGRES_USER", "stonks")
    password = os.getenv("POSTGRES_PASSWORD", "")
    database = os.getenv("POSTGRES_DB", "stonks")

    migrations_dir = os.path.join(
        os.path.dirname(__file__), "..", "..", "infra", "migrations"
    )
    migrations_dir = os.path.normpath(migrations_dir)

    if not os.path.isdir(migrations_dir):
        logger.error("Migrations directory not found: %s", migrations_dir)
        sys.exit(1)

    files = sorted(glob.glob(os.path.join(migrations_dir, "*.sql")))
    if not files:
        logger.warning("No migration files found in %s", migrations_dir)
        return

    logger.info("Connecting to %s@%s:%d/%s", user, host, port, database)
    conn = await asyncpg.connect(
        host=host, port=port, user=user, password=password, database=database
    )

    try:
        for path in files:
            name = os.path.basename(path)
            with open(path) as f:
                sql = f.read()
            # Split on semicolons and execute each statement individually.
            # asyncpg.execute() doesn't support multi-statement strings.
            statements = [s.strip() for s in sql.split(";") if s.strip()]
            try:
                for stmt in statements:
                    await conn.execute(stmt)
                logger.info("  ✓ %s (%d statements)", name, len(statements))
            except Exception as exc:
                logger.warning("  ⚠ %s: %s", name, exc)
    finally:
        await conn.close()

    logger.info("Migrations complete (%d files)", len(files))


def main() -> None:
    logging.basicConfig(
        level=logging.INFO,
        format="%(asctime)s %(name)s %(message)s",
        datefmt="%H:%M:%S",
    )
    asyncio.run(run_migrations())


if __name__ == "__main__":
    main()