"""
run_migrations.py — fleettickets · apply SQL migrations in order.

Applies migrations/*.sql (lexical order) against DATABASE_URL, tracking applied
files in tickets.schema_migrations. Migrations are idempotent, so re-running is
safe. Run: `python run_migrations.py`.
"""

from __future__ import annotations

import glob
import os

import psycopg2

MIG_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "migrations")


def main() -> None:
    dsn = os.environ.get("DATABASE_URL")
    if not dsn:
        raise SystemExit("DATABASE_URL is not set")
    conn = psycopg2.connect(dsn)
    conn.autocommit = False
    try:
        with conn.cursor() as cur:
            cur.execute("CREATE SCHEMA IF NOT EXISTS tickets")
            cur.execute(
                "CREATE TABLE IF NOT EXISTS tickets.schema_migrations "
                "(filename text PRIMARY KEY, applied_at timestamptz NOT NULL DEFAULT now())"
            )
            conn.commit()
            cur.execute("SELECT filename FROM tickets.schema_migrations")
            applied = {r[0] for r in cur.fetchall()}

            for path in sorted(glob.glob(os.path.join(MIG_DIR, "*.sql"))):
                fn = os.path.basename(path)
                if fn in applied:
                    print(f"  skip   {fn}")
                    continue
                print(f"  apply  {fn}")
                with open(path, encoding="utf-8") as f:
                    cur.execute(f.read())
                cur.execute(
                    "INSERT INTO tickets.schema_migrations (filename) VALUES (%s) "
                    "ON CONFLICT DO NOTHING",
                    (fn,),
                )
                conn.commit()
        print("migrations up to date.")
    finally:
        conn.close()


if __name__ == "__main__":
    main()