package enterprise

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 {
	db              *gorm.DB
	enterpriseStore *postgres.EnterpriseStore
	shopStore       *postgres.ShopStore
	accountStore    *postgres.AccountStore
}

func New(db *gorm.DB, enterpriseStore *postgres.EnterpriseStore, shopStore *postgres.ShopStore, accountStore *postgres.AccountStore) *Service {
	return &Service{
		db:              db,
		enterpriseStore: enterpriseStore,
		shopStore:       shopStore,
		accountStore:    accountStore,
	}
}

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

	if req.EnterpriseCode != "" {
		existing, _ := s.enterpriseStore.GetByCode(ctx, req.EnterpriseCode)
		if existing != nil {
			return nil, errors.New(errors.CodeEnterpriseCodeExists, "企业编号已存在")
		}
	}

	existingAccount, _ := s.accountStore.GetByPhone(ctx, req.LoginPhone)
	if existingAccount != nil {
		return nil, errors.New(errors.CodePhoneExists, "手机号已被使用")
	}

	if req.OwnerShopID != nil {
		_, err := s.shopStore.GetByID(ctx, *req.OwnerShopID)
		if err != nil {
			return nil, errors.New(errors.CodeShopNotFound, "归属店铺不存在或无效")
		}
	}

	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(req.Password), bcrypt.DefaultCost)
	if err != nil {
		return nil, fmt.Errorf("密码加密失败: %w", err)
	}

	var enterprise *model.Enterprise
	var account *model.Account

	err = s.db.Transaction(func(tx *gorm.DB) error {
		enterprise = &model.Enterprise{
			EnterpriseName:  req.EnterpriseName,
			EnterpriseCode:  req.EnterpriseCode,
			OwnerShopID:     req.OwnerShopID,
			LegalPerson:     req.LegalPerson,
			ContactName:     req.ContactName,
			ContactPhone:    req.ContactPhone,
			BusinessLicense: req.BusinessLicense,
			Province:        req.Province,
			City:            req.City,
			District:        req.District,
			Address:         req.Address,
			Status:          constants.StatusEnabled,
		}
		enterprise.Creator = currentUserID
		enterprise.Updater = currentUserID

		if err := tx.WithContext(ctx).Create(enterprise).Error; err != nil {
			return fmt.Errorf("创建企业失败: %w", err)
		}

		account = &model.Account{
			Username:     req.EnterpriseName,
			Phone:        req.LoginPhone,
			Password:     string(hashedPassword),
			UserType:     constants.UserTypeEnterprise,
			EnterpriseID: &enterprise.ID,
			Status:       constants.StatusEnabled,
		}
		account.Creator = currentUserID
		account.Updater = currentUserID

		if err := tx.WithContext(ctx).Create(account).Error; err != nil {
			return fmt.Errorf("创建企业账号失败: %w", err)
		}

		return nil
	})

	if err != nil {
		return nil, err
	}

	ownerShopName := ""
	if enterprise.OwnerShopID != nil {
		if shop, err := s.shopStore.GetByID(ctx, *enterprise.OwnerShopID); err == nil {
			ownerShopName = shop.ShopName
		}
	}

	return &model.CreateEnterpriseResp{
		Enterprise: model.EnterpriseItem{
			ID:              enterprise.ID,
			EnterpriseName:  enterprise.EnterpriseName,
			EnterpriseCode:  enterprise.EnterpriseCode,
			OwnerShopID:     enterprise.OwnerShopID,
			OwnerShopName:   ownerShopName,
			LegalPerson:     enterprise.LegalPerson,
			ContactName:     enterprise.ContactName,
			ContactPhone:    enterprise.ContactPhone,
			LoginPhone:      req.LoginPhone,
			BusinessLicense: enterprise.BusinessLicense,
			Province:        enterprise.Province,
			City:            enterprise.City,
			District:        enterprise.District,
			Address:         enterprise.Address,
			Status:          enterprise.Status,
			StatusName:      getStatusName(enterprise.Status),
			CreatedAt:       enterprise.CreatedAt.Format("2006-01-02 15:04:05"),
		},
		AccountID: account.ID,
	}, nil
}

// Update 更新企业信息
func (s *Service) Update(ctx context.Context, id uint, req *model.UpdateEnterpriseRequest) (*model.Enterprise, error) {
	// 获取当前用户 ID
	currentUserID := middleware.GetUserIDFromContext(ctx)
	if currentUserID == 0 {
		return nil, errors.New(errors.CodeUnauthorized, "未授权访问")
	}

	// 查询企业
	enterprise, err := s.enterpriseStore.GetByID(ctx, id)
	if err != nil {
		return nil, errors.New(errors.CodeEnterpriseNotFound, "企业不存在")
	}

	// 检查企业编号唯一性（如果修改了编号）
	if req.EnterpriseCode != nil && *req.EnterpriseCode != enterprise.EnterpriseCode {
		existing, err := s.enterpriseStore.GetByCode(ctx, *req.EnterpriseCode)
		if err == nil && existing != nil && existing.ID != id {
			return nil, errors.New(errors.CodeEnterpriseCodeExists, "企业编号已存在")
		}
		enterprise.EnterpriseCode = *req.EnterpriseCode
	}

	// 更新字段
	if req.EnterpriseName != nil {
		enterprise.EnterpriseName = *req.EnterpriseName
	}
	if req.LegalPerson != nil {
		enterprise.LegalPerson = *req.LegalPerson
	}
	if req.ContactName != nil {
		enterprise.ContactName = *req.ContactName
	}
	if req.ContactPhone != nil {
		enterprise.ContactPhone = *req.ContactPhone
	}
	if req.BusinessLicense != nil {
		enterprise.BusinessLicense = *req.BusinessLicense
	}
	if req.Province != nil {
		enterprise.Province = *req.Province
	}
	if req.City != nil {
		enterprise.City = *req.City
	}
	if req.District != nil {
		enterprise.District = *req.District
	}
	if req.Address != nil {
		enterprise.Address = *req.Address
	}

	enterprise.Updater = currentUserID

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

	return enterprise, nil
}

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

	enterprise, err := s.enterpriseStore.GetByID(ctx, id)
	if err != nil {
		return errors.New(errors.CodeEnterpriseNotFound, "企业不存在")
	}

	return s.db.Transaction(func(tx *gorm.DB) error {
		enterprise.Status = status
		enterprise.Updater = currentUserID
		if err := tx.WithContext(ctx).Save(enterprise).Error; err != nil {
			return fmt.Errorf("更新企业状态失败: %w", err)
		}

		if err := tx.WithContext(ctx).Model(&model.Account{}).
			Where("enterprise_id = ?", id).
			Updates(map[string]interface{}{
				"status":  status,
				"updater": currentUserID,
			}).Error; err != nil {
			return fmt.Errorf("同步更新企业账号状态失败: %w", err)
		}

		return nil
	})
}

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

	_, err := s.enterpriseStore.GetByID(ctx, id)
	if err != nil {
		return errors.New(errors.CodeEnterpriseNotFound, "企业不存在")
	}

	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
	if err != nil {
		return fmt.Errorf("密码加密失败: %w", err)
	}

	return s.db.WithContext(ctx).Model(&model.Account{}).
		Where("enterprise_id = ?", id).
		Updates(map[string]interface{}{
			"password": string(hashedPassword),
			"updater":  currentUserID,
		}).Error
}

func (s *Service) GetByID(ctx context.Context, id uint) (*model.Enterprise, error) {
	enterprise, err := s.enterpriseStore.GetByID(ctx, id)
	if err != nil {
		return nil, errors.New(errors.CodeEnterpriseNotFound, "企业不存在")
	}
	return enterprise, nil
}

func (s *Service) List(ctx context.Context, req *model.EnterpriseListReq) (*model.EnterprisePageResult, error) {
	opts := &store.QueryOptions{
		Page:     req.Page,
		PageSize: req.PageSize,
	}
	if opts.Page == 0 {
		opts.Page = 1
	}
	if opts.PageSize == 0 {
		opts.PageSize = constants.DefaultPageSize
	}

	filters := make(map[string]interface{})
	if req.EnterpriseName != "" {
		filters["enterprise_name"] = req.EnterpriseName
	}
	if req.ContactPhone != "" {
		filters["contact_phone"] = req.ContactPhone
	}
	if req.OwnerShopID != nil {
		filters["owner_shop_id"] = *req.OwnerShopID
	}
	if req.Status != nil {
		filters["status"] = *req.Status
	}

	enterprises, total, err := s.enterpriseStore.List(ctx, opts, filters)
	if err != nil {
		return nil, fmt.Errorf("查询企业列表失败: %w", err)
	}

	enterpriseIDs := make([]uint, 0, len(enterprises))
	shopIDs := make([]uint, 0)
	for _, e := range enterprises {
		enterpriseIDs = append(enterpriseIDs, e.ID)
		if e.OwnerShopID != nil {
			shopIDs = append(shopIDs, *e.OwnerShopID)
		}
	}

	accountMap := make(map[uint]string)
	if len(enterpriseIDs) > 0 {
		var accounts []model.Account
		s.db.WithContext(ctx).Where("enterprise_id IN ?", enterpriseIDs).Find(&accounts)
		for _, acc := range accounts {
			if acc.EnterpriseID != nil {
				accountMap[*acc.EnterpriseID] = acc.Phone
			}
		}
	}

	shopMap := make(map[uint]string)
	if len(shopIDs) > 0 {
		var shops []model.Shop
		s.db.WithContext(ctx).Where("id IN ?", shopIDs).Find(&shops)
		for _, shop := range shops {
			shopMap[shop.ID] = shop.ShopName
		}
	}

	items := make([]model.EnterpriseItem, 0, len(enterprises))
	for _, e := range enterprises {
		ownerShopName := ""
		if e.OwnerShopID != nil {
			ownerShopName = shopMap[*e.OwnerShopID]
		}
		items = append(items, model.EnterpriseItem{
			ID:              e.ID,
			EnterpriseName:  e.EnterpriseName,
			EnterpriseCode:  e.EnterpriseCode,
			OwnerShopID:     e.OwnerShopID,
			OwnerShopName:   ownerShopName,
			LegalPerson:     e.LegalPerson,
			ContactName:     e.ContactName,
			ContactPhone:    e.ContactPhone,
			LoginPhone:      accountMap[e.ID],
			BusinessLicense: e.BusinessLicense,
			Province:        e.Province,
			City:            e.City,
			District:        e.District,
			Address:         e.Address,
			Status:          e.Status,
			StatusName:      getStatusName(e.Status),
			CreatedAt:       e.CreatedAt.Format("2006-01-02 15:04:05"),
		})
	}

	return &model.EnterprisePageResult{
		Items: items,
		Total: total,
		Page:  opts.Page,
		Size:  opts.PageSize,
	}, nil
}

func getStatusName(status int) string {
	if status == constants.StatusEnabled {
		return "启用"
	}
	return "禁用"
}