import asyncio
import json
import os
import zipfile
from pathlib import Path
from types import SimpleNamespace
from unittest.mock import AsyncMock

from bot.services.backup_worker import BACKUP_FILENAME_PREFIX, BackupWorker
from bot.services.settings_override_service import refresh_overrides_from_db
from config.settings import Settings


class _FakeBot:
    def __init__(self):
        self.send_document = AsyncMock()
        self.send_message = AsyncMock()


class _FakePgDumpBackupWorker(BackupWorker):
    def _run_pg_dump(self, dump_path: Path) -> None:
        dump_path.write_bytes(b"fake custom pg dump")


class _FakeSession:
    async def __aenter__(self):
        return self

    async def __aexit__(self, exc_type, exc, tb):
        return False


class _FakeSessionFactory:
    def __call__(self):
        return _FakeSession()


def _settings(tmp_path: Path, compose_dir: Path, **overrides) -> Settings:
    values = {
        "BOT_TOKEN": "token",
        "POSTGRES_USER": "app_user",
        "POSTGRES_PASSWORD": "app_password",
        "POSTGRES_DB": "shop",
        "BACKUP_DIR": str(tmp_path / "backups"),
        "BACKUP_COMPOSE_SOURCE_DIR": str(compose_dir),
        "BACKUP_CHAT_ID": 123,
        "BACKUP_LOCAL_RETENTION": 1,
        "_env_file": None,
    }
    values.update(overrides)
    return Settings(**values)


def test_backup_worker_creates_archive_with_db_dump_and_compose_snapshot(tmp_path):
    compose_dir = tmp_path / "compose"
    compose_dir.mkdir()
    (compose_dir / "docker-compose.yml").write_text("services: {}\n", encoding="utf-8")
    (compose_dir / ".env").write_text("POSTGRES_PASSWORD=secret\n", encoding="utf-8")
    (compose_dir / "Caddyfile").write_text("example.com\n", encoding="utf-8")
    (compose_dir / "node_modules").mkdir()
    (compose_dir / "node_modules" / "ignored.txt").write_text("ignored", encoding="utf-8")

    settings = _settings(tmp_path, compose_dir)
    backup_dir = Path(settings.BACKUP_DIR)
    backup_dir.mkdir(parents=True)
    old_archive = backup_dir / f"{BACKUP_FILENAME_PREFIX}old.zip"
    old_archive.write_text("old", encoding="utf-8")
    os.utime(old_archive, (1, 1))

    bot = _FakeBot()
    worker = _FakePgDumpBackupWorker(settings, bot)

    result = asyncio.run(worker.create_and_send_backup())

    assert result.archive_path.is_file()
    assert result.db_dump_included is True
    assert result.compose_files_count == 3
    assert not old_archive.exists()
    bot.send_document.assert_awaited_once()
    send_kwargs = bot.send_document.await_args.kwargs
    assert send_kwargs["chat_id"] == 123
    assert "Database dump: yes" in send_kwargs["caption"]

    with zipfile.ZipFile(result.archive_path) as archive:
        names = set(archive.namelist())
        manifest = json.loads(archive.read("manifest.json").decode("utf-8"))

    assert "database/shop.dump" in names
    assert "compose/docker-compose.yml" in names
    assert "compose/.env" in names
    assert "compose/Caddyfile" in names
    assert all("node_modules" not in name for name in names)
    assert manifest["postgres"]["database"] == "shop"
    assert manifest["compose"]["files_count"] == 3


def test_backup_worker_falls_back_to_log_chat_and_thread(tmp_path):
    compose_dir = tmp_path / "compose"
    compose_dir.mkdir()
    settings = _settings(
        tmp_path,
        compose_dir,
        BACKUP_CHAT_ID="",
        BACKUP_THREAD_ID="",
        LOG_CHAT_ID=-100123,
        LOG_THREAD_ID=77,
        BACKUP_POSTGRES_DUMP_ENABLED=False,
        BACKUP_COMPOSE_ENABLED=False,
    )
    bot = _FakeBot()
    worker = _FakePgDumpBackupWorker(settings, bot)

    result = asyncio.run(worker.create_and_send_backup())

    assert result.db_dump_included is False
    bot.send_document.assert_awaited_once()
    send_kwargs = bot.send_document.await_args.kwargs
    assert send_kwargs["chat_id"] == -100123
    assert send_kwargs["message_thread_id"] == 77


def test_backup_worker_can_create_manual_backup(tmp_path):
    compose_dir = tmp_path / "compose"
    compose_dir.mkdir()
    settings = _settings(
        tmp_path,
        compose_dir,
        BACKUP_POSTGRES_DUMP_ENABLED=True,
        BACKUP_COMPOSE_ENABLED=False,
    )
    bot = _FakeBot()
    worker = _FakePgDumpBackupWorker(settings, bot)

    result = asyncio.run(worker.create_backup(backup_type="manual"))

    assert result.archive_path.is_file()
    assert result.to_payload()["archive_name"] == result.archive_path.name
    with zipfile.ZipFile(result.archive_path) as archive:
        manifest = json.loads(archive.read("manifest.json").decode("utf-8"))
    assert manifest["type"] == "manual"
    assert "archive" in manifest


def test_backup_worker_allocates_unique_archive_path(tmp_path):
    settings = _settings(tmp_path, tmp_path / "compose")
    worker = _FakePgDumpBackupWorker(settings, _FakeBot())
    archive_path = tmp_path / "remnawave-minishop-backup-20260527-120000+0300.zip"
    archive_path.write_text("existing", encoding="utf-8")

    unique_path = worker._unique_archive_path(archive_path)

    assert unique_path.name == "remnawave-minishop-backup-20260527-120000+0300-2.zip"


def test_backup_worker_does_not_fail_when_compose_source_is_not_mounted(tmp_path):
    missing_compose_dir = tmp_path / "missing-compose"
    settings = _settings(
        tmp_path,
        missing_compose_dir,
        BACKUP_POSTGRES_DUMP_ENABLED=True,
        BACKUP_COMPOSE_ENABLED=True,
    )
    bot = _FakeBot()
    worker = _FakePgDumpBackupWorker(settings, bot)

    result = asyncio.run(worker.create_and_send_backup())

    assert result.archive_path.is_file()
    assert result.db_dump_included is True
    assert result.compose_files_count == 0
    assert any("Compose source directory is unavailable" in item for item in result.warnings)
    with zipfile.ZipFile(result.archive_path) as archive:
        names = set(archive.namelist())
    assert "database/shop.dump" in names


def test_backup_settings_refresh_restores_env_default_when_override_is_deleted(monkeypatch):
    from bot.services import settings_override_service

    settings = SimpleNamespace(BACKUP_ENABLED=True)
    monkeypatch.setattr(
        settings_override_service.app_settings_dal,
        "get_all_overrides",
        AsyncMock(return_value={}),
    )
    monkeypatch.setattr(
        settings_override_service,
        "Settings",
        lambda: SimpleNamespace(BACKUP_ENABLED=False),
    )

    applied = asyncio.run(
        refresh_overrides_from_db(
            settings,
            _FakeSessionFactory(),
            keys={"BACKUP_ENABLED"},
        )
    )

    assert applied == 0
    assert settings.BACKUP_ENABLED is False