from src.application.abstractions import IUnitOfWork
from src.application.contracts import IHashService, ILogger, ICache
from src.application.domain.exceptions import ApplicationException
from src.infrastructure.database.decorators import transactional


class ChangePasswordCompleteCommand:
    def __init__(
        self,
        unit_of_work: IUnitOfWork,
        hash_service: IHashService,
        cache: ICache,
        logger: ILogger,
    ):
        self._unit_of_work = unit_of_work
        self._hash_service = hash_service
        self._cache = cache
        self._logger = logger

    @transactional
    async def __call__(
        self,
        *,
        user_id: str,
        code: str,
        new_password: str,
        confirm_password: str,
    ) -> bool:
        code = (code or '').strip()

        USER_PREFIX = 'change_password:user:'
        CODE_PREFIX = 'change_password:code:'

        user_key = f'{USER_PREFIX}{user_id}'
        code_key = f'{CODE_PREFIX}{code}'

        if new_password != confirm_password:
            self._logger.info(f'Change password failed: passwords do not match (user_id={user_id})')
            raise ApplicationException(400, 'Passwords do not match')

        cached_user_id = await self._cache.get(code_key)
        if not cached_user_id:
            self._logger.info(f'Change password failed: code not found (user_id={user_id})')
            raise ApplicationException(400, 'Invalid or expired code')

        if cached_user_id != user_id:
            self._logger.info(f'Change password failed: code-user mismatch (user_id={user_id})')
            raise ApplicationException(400, 'Invalid or expired code')

        code_hash = await self._cache.get(user_key)
        if not code_hash:
            self._logger.info(f'Change password failed: user key missing (user_id={user_id})')
            raise ApplicationException(400, 'Invalid or expired code')

        ok = await self._hash_service.verify(hashed_value=code_hash, plain_value=code)
        if not ok:
            self._logger.info(f'Change password failed: code hash mismatch (user_id={user_id})')
            raise ApplicationException(400, 'Invalid or expired code')

        current_password_hash = await self._unit_of_work.user_repository.get_password_hash(user_id=user_id)

        is_same = await self._hash_service.verify(hashed_value=current_password_hash, plain_value=new_password)
        if is_same:
            self._logger.info(f'Change password failed: new password same as current (user_id={user_id})')
            raise ApplicationException(400, 'New password must differ from the current one')

        new_password_hash = await self._hash_service.hash(new_password)
        user = await self._unit_of_work.user_repository.set_password(
            user_id=user_id,
            password_hash=new_password_hash,
        )
        await self._cache.set_user(user_id, user)

        try:
            await self._cache.delete(code_key)
            await self._cache.delete(user_key)
        except Exception as e:
            self._logger.warning(f'Change password cleanup failed (user_id={user_id}): {e}')

        self._logger.info(f'Password changed for user_id={user_id}')
        return True