#!/usr/bin/env python3

from __future__ import annotations

import argparse
import sqlite3
import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

from base_datos import iniciar_historial_usuario
from config import HISTORY_DB_PATH


def _obtener_tablas(conn: sqlite3.Connection) -> list[str]:
    rows = conn.execute(
        "SELECT name FROM sqlite_master WHERE type = 'table' AND name NOT LIKE 'sqlite_%' ORDER BY name"
    ).fetchall()
    return [str(r[0]) for r in rows]


def limpiar_datos(db_path: Path) -> dict[str, int]:
    if not db_path.exists():
        iniciar_historial_usuario()

    deleted_by_table: dict[str, int] = {}
    with sqlite3.connect(db_path) as conn:
        conn.execute("PRAGMA foreign_keys = OFF")
        tables = _obtener_tablas(conn)

        for table_name in tables:
            cur = conn.execute(f"DELETE FROM {table_name}")
            deleted_by_table[table_name] = int(cur.rowcount or 0)

        all_tables = {r[0] for r in conn.execute("SELECT name FROM sqlite_master WHERE type='table'").fetchall()}
        if "sqlite_sequence" in all_tables:
            conn.execute("DELETE FROM sqlite_sequence")

        conn.commit()

    return deleted_by_table


def main() -> int:
    parser = argparse.ArgumentParser(description="Elimina todos los datos de la BDM (SQLite) del proyecto.")
    parser.add_argument(
        "--db-path",
        type=Path,
        default=HISTORY_DB_PATH,
        help=f"Ruta de la base de datos (por defecto: {HISTORY_DB_PATH})",
    )
    args = parser.parse_args()

    db_path = args.db_path.resolve()
    deleted_by_table = limpiar_datos(db_path)

    total = sum(deleted_by_table.values())
    print(f"BD limpiada: {db_path}")
    for table_name, count in deleted_by_table.items():
        print(f"  {table_name}: {count} filas eliminadas")
    print(f"Total eliminado: {total} filas")

    iniciar_historial_usuario()
    print("Esquema verificado (tablas e índices recreados si faltaban).")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())