"""
tests/test_backup.py
---------------------
Tests for db.database backup_db() and restore_db().
"""

import os
import pytest
from db.database import backup_db, restore_db, DB_PATH, get_connection
from db.models import insert_draw, get_draws_with_game, get_game_by_name


# ── backup_db ─────────────────────────────────────────────────────────────────

def test_backup_creates_file(tmp_db, tmp_path):
    dest = backup_db(dest_dir=str(tmp_path))
    assert os.path.isfile(dest)


def test_backup_filename_contains_timestamp(tmp_db, tmp_path):
    dest = backup_db(dest_dir=str(tmp_path))
    basename = os.path.basename(dest)
    assert basename.startswith("lottosight_backup_")
    assert basename.endswith(".db")


def test_backup_returns_path_string(tmp_db, tmp_path):
    result = backup_db(dest_dir=str(tmp_path))
    assert isinstance(result, str)
    assert len(result) > 0


def test_backup_file_is_valid_sqlite(tmp_db, tmp_path):
    dest = backup_db(dest_dir=str(tmp_path))
    import sqlite3
    conn = sqlite3.connect(dest)
    cursor = conn.cursor()
    cursor.execute("SELECT name FROM sqlite_master WHERE type='table'")
    tables = {r[0] for r in cursor.fetchall()}
    conn.close()
    assert "games" in tables
    assert "draws" in tables


def test_backup_preserves_draw_data(tmp_db, tmp_path):
    game = get_game_by_name("Powerball")
    insert_draw(game["id"], "2024-06-01", [5, 14, 22, 36, 69], bonus=7)
    dest = backup_db(dest_dir=str(tmp_path))
    import sqlite3
    conn = sqlite3.connect(dest)
    conn.row_factory = sqlite3.Row
    cursor = conn.cursor()
    cursor.execute("SELECT numbers FROM draws WHERE draw_date='2024-06-01'")
    row = cursor.fetchone()
    conn.close()
    assert row is not None
    assert "5" in row["numbers"]


def test_backup_creates_dest_dir_if_missing(tmp_db, tmp_path):
    nested = str(tmp_path / "a" / "b" / "c")
    dest = backup_db(dest_dir=nested)
    assert os.path.isfile(dest)


def test_backup_default_dest_dir(tmp_db, monkeypatch, tmp_path):
    from core.paths import user_data_dir as _udd
    monkeypatch.setattr("db.database.user_data_dir", lambda: str(tmp_path))
    dest = backup_db()   # no dest_dir — should use exports/ sub-dir
    assert os.path.isfile(dest)
    assert "exports" in dest


# ── restore_db ────────────────────────────────────────────────────────────────

def test_restore_missing_file_raises(tmp_db):
    with pytest.raises(FileNotFoundError):
        restore_db("/nonexistent/backup.db")


def test_restore_replaces_live_db(tmp_db, tmp_path):
    game = get_game_by_name("Powerball")
    insert_draw(game["id"], "2024-07-04", [3, 17, 28, 45, 62], bonus=12)
    backup_path = backup_db(dest_dir=str(tmp_path))

    # Delete the draw from the live DB
    conn = get_connection()
    conn.execute("DELETE FROM draws WHERE draw_date='2024-07-04'")
    conn.commit()
    conn.close()

    draws_before = get_draws_with_game(game_id=game["id"])
    assert not any(d["draw_date"] == "2024-07-04" for d in draws_before)

    restore_db(backup_path)

    draws_after = get_draws_with_game(game_id=game["id"])
    assert any(d["draw_date"] == "2024-07-04" for d in draws_after)


def test_restore_returns_none(tmp_db, tmp_path):
    backup_path = backup_db(dest_dir=str(tmp_path))
    result = restore_db(backup_path)
    assert result is None