package shop

import (
	"context"
	"fmt"

	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/internal/store"
	"github.com/break/junhong_cmp_fiber/internal/store/postgres"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
	"github.com/break/junhong_cmp_fiber/pkg/middleware"
	"golang.org/x/crypto/bcrypt"
	"gorm.io/gorm"
)

type Service struct {
	shopStore    *postgres.ShopStore
	accountStore *postgres.AccountStore
}

func New(shopStore *postgres.ShopStore, accountStore *postgres.AccountStore) *Service {
	return &Service{
		shopStore:    shopStore,
		accountStore: accountStore,
	}
}

func (s *Service) Create(ctx context.Context, req *model.CreateShopRequest) (*model.ShopResponse, error) {
	currentUserID := middleware.GetUserIDFromContext(ctx)
	if currentUserID == 0 {
		return nil, errors.New(errors.CodeUnauthorized, "未授权访问")
	}

	existing, err := s.shopStore.GetByCode(ctx, req.ShopCode)
	if err == nil && existing != nil {
		return nil, errors.New(errors.CodeShopCodeExists, "店铺编号已存在")
	}

	level := 1
	if req.ParentID != nil {
		parent, err := s.shopStore.GetByID(ctx, *req.ParentID)
		if err != nil {
			return nil, errors.New(errors.CodeInvalidParentID, "上级店铺不存在或无效")
		}
		level = parent.Level + 1
		if level > constants.ShopMaxLevel {
			return nil, errors.New(errors.CodeShopLevelExceeded, "店铺层级不能超过 7 级")
		}
	}

	existingAccount, err := s.accountStore.GetByUsername(ctx, req.InitUsername)
	if err == nil && existingAccount != nil {
		return nil, errors.New(errors.CodeUsernameExists, "初始账号用户名已存在")
	}

	existingAccount, err = s.accountStore.GetByPhone(ctx, req.InitPhone)
	if err == nil && existingAccount != nil {
		return nil, errors.New(errors.CodePhoneExists, "初始账号手机号已存在")
	}

	shop := &model.Shop{
		ShopName:     req.ShopName,
		ShopCode:     req.ShopCode,
		ParentID:     req.ParentID,
		Level:        level,
		ContactName:  req.ContactName,
		ContactPhone: req.ContactPhone,
		Province:     req.Province,
		City:         req.City,
		District:     req.District,
		Address:      req.Address,
		Status:       constants.ShopStatusEnabled,
	}
	shop.Creator = currentUserID
	shop.Updater = currentUserID

	if err := s.shopStore.Create(ctx, shop); err != nil {
		return nil, fmt.Errorf("创建店铺失败: %w", err)
	}

	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(req.InitPassword), bcrypt.DefaultCost)
	if err != nil {
		return nil, fmt.Errorf("密码哈希失败: %w", err)
	}

	account := &model.Account{
		Username: req.InitUsername,
		Phone:    req.InitPhone,
		Password: string(hashedPassword),
		UserType: constants.UserTypeAgent,
		ShopID:   &shop.ID,
		Status:   constants.StatusEnabled,
	}
	account.Creator = currentUserID
	account.Updater = currentUserID

	if err := s.accountStore.Create(ctx, account); err != nil {
		return nil, fmt.Errorf("创建初始账号失败: %w", err)
	}

	return &model.ShopResponse{
		ID:           shop.ID,
		ShopName:     shop.ShopName,
		ShopCode:     shop.ShopCode,
		ParentID:     shop.ParentID,
		Level:        shop.Level,
		ContactName:  shop.ContactName,
		ContactPhone: shop.ContactPhone,
		Province:     shop.Province,
		City:         shop.City,
		District:     shop.District,
		Address:      shop.Address,
		Status:       shop.Status,
		CreatedAt:    shop.CreatedAt.Format("2006-01-02 15:04:05"),
		UpdatedAt:    shop.UpdatedAt.Format("2006-01-02 15:04:05"),
	}, nil
}

func (s *Service) Update(ctx context.Context, id uint, req *model.UpdateShopRequest) (*model.ShopResponse, error) {
	currentUserID := middleware.GetUserIDFromContext(ctx)
	if currentUserID == 0 {
		return nil, errors.New(errors.CodeUnauthorized, "未授权访问")
	}

	shop, err := s.shopStore.GetByID(ctx, id)
	if err != nil {
		return nil, errors.New(errors.CodeShopNotFound, "店铺不存在")
	}

	shop.ShopName = req.ShopName
	shop.ContactName = req.ContactName
	shop.ContactPhone = req.ContactPhone
	shop.Province = req.Province
	shop.City = req.City
	shop.District = req.District
	shop.Address = req.Address
	shop.Status = req.Status
	shop.Updater = currentUserID

	if err := s.shopStore.Update(ctx, shop); err != nil {
		return nil, err
	}

	return &model.ShopResponse{
		ID:           shop.ID,
		ShopName:     shop.ShopName,
		ShopCode:     shop.ShopCode,
		ParentID:     shop.ParentID,
		Level:        shop.Level,
		ContactName:  shop.ContactName,
		ContactPhone: shop.ContactPhone,
		Province:     shop.Province,
		City:         shop.City,
		District:     shop.District,
		Address:      shop.Address,
		Status:       shop.Status,
		CreatedAt:    shop.CreatedAt.Format("2006-01-02 15:04:05"),
		UpdatedAt:    shop.UpdatedAt.Format("2006-01-02 15:04:05"),
	}, nil
}

// Disable 禁用店铺
func (s *Service) Disable(ctx context.Context, id uint) error {
	// 获取当前用户 ID
	currentUserID := middleware.GetUserIDFromContext(ctx)
	if currentUserID == 0 {
		return errors.New(errors.CodeUnauthorized, "未授权访问")
	}

	// 查询店铺
	shop, err := s.shopStore.GetByID(ctx, id)
	if err != nil {
		return errors.New(errors.CodeShopNotFound, "店铺不存在")
	}

	// 更新状态
	shop.Status = constants.StatusDisabled
	shop.Updater = currentUserID

	return s.shopStore.Update(ctx, shop)
}

// Enable 启用店铺
func (s *Service) Enable(ctx context.Context, id uint) error {
	// 获取当前用户 ID
	currentUserID := middleware.GetUserIDFromContext(ctx)
	if currentUserID == 0 {
		return errors.New(errors.CodeUnauthorized, "未授权访问")
	}

	// 查询店铺
	shop, err := s.shopStore.GetByID(ctx, id)
	if err != nil {
		return errors.New(errors.CodeShopNotFound, "店铺不存在")
	}

	// 更新状态
	shop.Status = constants.StatusEnabled
	shop.Updater = currentUserID

	return s.shopStore.Update(ctx, shop)
}

// GetByID 获取店铺详情
func (s *Service) GetByID(ctx context.Context, id uint) (*model.Shop, error) {
	shop, err := s.shopStore.GetByID(ctx, id)
	if err != nil {
		return nil, errors.New(errors.CodeShopNotFound, "店铺不存在")
	}
	return shop, nil
}

func (s *Service) ListShopResponses(ctx context.Context, req *model.ShopListRequest) ([]*model.ShopResponse, int64, error) {
	opts := &store.QueryOptions{
		Page:     req.Page,
		PageSize: req.PageSize,
		OrderBy:  "created_at DESC",
	}
	if opts.Page == 0 {
		opts.Page = 1
	}
	if opts.PageSize == 0 {
		opts.PageSize = constants.DefaultPageSize
	}

	filters := make(map[string]interface{})
	if req.ShopName != "" {
		filters["shop_name"] = req.ShopName
	}
	if req.ShopCode != "" {
		filters["shop_code"] = req.ShopCode
	}
	if req.ParentID != nil {
		filters["parent_id"] = *req.ParentID
	}
	if req.Level != nil {
		filters["level"] = *req.Level
	}
	if req.Status != nil {
		filters["status"] = *req.Status
	}

	shops, total, err := s.shopStore.List(ctx, opts, filters)
	if err != nil {
		return nil, 0, fmt.Errorf("查询店铺列表失败: %w", err)
	}

	responses := make([]*model.ShopResponse, 0, len(shops))
	for _, shop := range shops {
		responses = append(responses, &model.ShopResponse{
			ID:           shop.ID,
			ShopName:     shop.ShopName,
			ShopCode:     shop.ShopCode,
			ParentID:     shop.ParentID,
			Level:        shop.Level,
			ContactName:  shop.ContactName,
			ContactPhone: shop.ContactPhone,
			Province:     shop.Province,
			City:         shop.City,
			District:     shop.District,
			Address:      shop.Address,
			Status:       shop.Status,
			CreatedAt:    shop.CreatedAt.Format("2006-01-02 15:04:05"),
			UpdatedAt:    shop.UpdatedAt.Format("2006-01-02 15:04:05"),
		})
	}

	return responses, total, nil
}

func (s *Service) List(ctx context.Context, opts *store.QueryOptions, filters map[string]interface{}) ([]*model.Shop, int64, error) {
	return s.shopStore.List(ctx, opts, filters)
}

func (s *Service) Delete(ctx context.Context, id uint) error {
	currentUserID := middleware.GetUserIDFromContext(ctx)
	if currentUserID == 0 {
		return errors.New(errors.CodeUnauthorized, "未授权访问")
	}

	shop, err := s.shopStore.GetByID(ctx, id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return errors.New(errors.CodeShopNotFound, "店铺不存在")
		}
		return fmt.Errorf("获取店铺失败: %w", err)
	}

	accounts, err := s.accountStore.GetByShopID(ctx, shop.ID)
	if err != nil {
		return fmt.Errorf("查询店铺账号失败: %w", err)
	}

	if len(accounts) > 0 {
		accountIDs := make([]uint, 0, len(accounts))
		for _, account := range accounts {
			accountIDs = append(accountIDs, account.ID)
		}
		if err := s.accountStore.BulkUpdateStatus(ctx, accountIDs, constants.StatusDisabled, currentUserID); err != nil {
			return fmt.Errorf("禁用店铺账号失败: %w", err)
		}
	}

	if err := s.shopStore.Delete(ctx, id); err != nil {
		return fmt.Errorf("删除店铺失败: %w", err)
	}

	return nil
}

// GetSubordinateShopIDs 获取下级店铺 ID 列表（包含自己）
func (s *Service) GetSubordinateShopIDs(ctx context.Context, shopID uint) ([]uint, error) {
	return s.shopStore.GetSubordinateShopIDs(ctx, shopID)
}