import uuid

from fastapi import Depends

from common.database.db_session_manager import DB_SESSION_MNG
from common.database.model.models import quotation_settings
from common.enums import DBWRType, ErrorType
from crud.quotation_setting_crud import IQuotationSettingCRUD, QuotationSettingCRUD
from router.v1.quotation_setting.protocol import (
    QuotationSettingData,
    Req_CreateQuotationSetting,
    Req_UpdateQuotationSetting,
    Res_DeleteQuotationSetting,
    Res_QuotationSetting,
    Res_QuotationSettingList,
)


class QuotationSettingService:
    """견적 설정 비즈니스 로직. user_id 로 소유권을 확인한다(유저별 설정)."""

    def __init__(self, qs_crud: IQuotationSettingCRUD = Depends(QuotationSettingCRUD)):
        self.qs_crud = qs_crud

    async def _fetch_owned(self, user_uuid: uuid.UUID, qt_setting_id: uuid.UUID):
        """설정 조회 + 소유권 확인. (ErrorType, setting|None) 반환."""
        err_type, setting = await DB_SESSION_MNG.execute_lambda(
            quotation_settings.DBType(),
            DBWRType.DB_READ.value,
            lambda s: self.qs_crud.get_by_id(s, qt_setting_id),
        )
        if err_type != ErrorType.SUCCESS or setting is None:
            return ErrorType.QUOTATION_SETTING_NOT_FOUND, None
        if setting.user_id != user_uuid:
            return ErrorType.QUOTATION_SETTING_NOT_FOUND, None
        return ErrorType.SUCCESS, setting

    async def list_settings(self, user_id: str) -> Res_QuotationSettingList:
        res = Res_QuotationSettingList()
        user_uuid = uuid.UUID(user_id)

        err_type, rows, total = await DB_SESSION_MNG.execute_lambda(
            quotation_settings.DBType(),
            DBWRType.DB_READ.value,
            lambda s: self.qs_crud.list_by_user(s, user_uuid),
        )
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res
        res.settings = [QuotationSettingData.model_validate(r) for r in rows]
        res.total = total
        return res

    async def get_setting(self, user_id: str, qt_setting_id: str) -> Res_QuotationSetting:
        res = Res_QuotationSetting()
        err_type, setting = await self._fetch_owned(uuid.UUID(user_id), uuid.UUID(qt_setting_id))
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res
        res.setting = QuotationSettingData.model_validate(setting)
        return res

    async def create_setting(self, user_id: str, req: Req_CreateQuotationSetting) -> Res_QuotationSetting:
        res = Res_QuotationSetting()
        setting = quotation_settings(
            user_id=uuid.UUID(user_id),
            target_margin_rate=req.target_margin_rate,
            card_count=req.card_count,
            done_ceiling_rate=req.done_ceiling_rate,
        )
        err_type = await DB_SESSION_MNG.execute_lambda_run(
            [quotation_settings.DBType()],
            [lambda s: self.qs_crud.add_setting(s, setting)],
        )
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res
        # 서버 기본값(created_at/updated_at)은 insert 후 객체에 실리지 않으므로 재조회한다.
        return await self.get_setting(user_id, str(setting.qt_setting_id))

    async def update_setting(self, user_id: str, qt_setting_id: str, req: Req_UpdateQuotationSetting) -> Res_QuotationSetting:
        res = Res_QuotationSetting()
        user_uuid = uuid.UUID(user_id)
        setting_uuid = uuid.UUID(qt_setting_id)
        data = req.model_dump(exclude_unset=True)

        # 소유권 확인
        err_type, _ = await self._fetch_owned(user_uuid, setting_uuid)
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res

        err_type = await DB_SESSION_MNG.execute_lambda_run(
            [quotation_settings.DBType()],
            [lambda s: self.qs_crud.update_setting(s, setting_uuid, data)],
        )
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res

        # 갱신 후 재조회
        return await self.get_setting(user_id, qt_setting_id)

    async def delete_setting(self, user_id: str, qt_setting_id: str) -> Res_DeleteQuotationSetting:
        res = Res_DeleteQuotationSetting()
        user_uuid = uuid.UUID(user_id)
        setting_uuid = uuid.UUID(qt_setting_id)

        err_type, _ = await self._fetch_owned(user_uuid, setting_uuid)
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
            return res

        err_type = await DB_SESSION_MNG.execute_lambda_run(
            [quotation_settings.DBType()],
            [lambda s: self.qs_crud.soft_delete(s, setting_uuid)],
        )
        if err_type != ErrorType.SUCCESS:
            res.result.SetResult(err_type)
        return res