package packagepkg

import (
	"context"
	"fmt"
	"time"

	"gorm.io/gorm"

	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/internal/model/dto"
	"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"
)

type Service struct {
	packageStore       *postgres.PackageStore
	packageSeriesStore *postgres.PackageSeriesStore
}

func New(packageStore *postgres.PackageStore, packageSeriesStore *postgres.PackageSeriesStore) *Service {
	return &Service{
		packageStore:       packageStore,
		packageSeriesStore: packageSeriesStore,
	}
}

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

	existing, _ := s.packageStore.GetByCode(ctx, req.PackageCode)
	if existing != nil {
		return nil, errors.New(errors.CodeConflict, "套餐编码已存在")
	}

	if req.SeriesID != nil && *req.SeriesID > 0 {
		_, err := s.packageSeriesStore.GetByID(ctx, *req.SeriesID)
		if err != nil {
			if err == gorm.ErrRecordNotFound {
				return nil, errors.New(errors.CodeNotFound, "套餐系列不存在")
			}
			return nil, fmt.Errorf("获取套餐系列失败: %w", err)
		}
	}

	pkg := &model.Package{
		PackageCode:    req.PackageCode,
		PackageName:    req.PackageName,
		PackageType:    req.PackageType,
		DurationMonths: req.DurationMonths,
		Price:          req.Price,
		Status:         constants.StatusEnabled,
		ShelfStatus:    2,
	}
	if req.SeriesID != nil {
		pkg.SeriesID = *req.SeriesID
	}
	if req.DataType != nil {
		pkg.DataType = *req.DataType
	}
	if req.RealDataMB != nil {
		pkg.RealDataMB = *req.RealDataMB
	}
	if req.VirtualDataMB != nil {
		pkg.VirtualDataMB = *req.VirtualDataMB
	}
	if req.DataAmountMB != nil {
		pkg.DataAmountMB = *req.DataAmountMB
	}
	if req.SuggestedCostPrice != nil {
		pkg.SuggestedCostPrice = *req.SuggestedCostPrice
	}
	if req.SuggestedRetailPrice != nil {
		pkg.SuggestedRetailPrice = *req.SuggestedRetailPrice
	}
	pkg.Creator = currentUserID

	if err := s.packageStore.Create(ctx, pkg); err != nil {
		return nil, fmt.Errorf("创建套餐失败: %w", err)
	}

	return s.toResponse(pkg), nil
}

func (s *Service) Get(ctx context.Context, id uint) (*dto.PackageResponse, error) {
	pkg, err := s.packageStore.GetByID(ctx, id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, errors.New(errors.CodeNotFound, "套餐不存在")
		}
		return nil, fmt.Errorf("获取套餐失败: %w", err)
	}
	return s.toResponse(pkg), nil
}

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

	pkg, err := s.packageStore.GetByID(ctx, id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, errors.New(errors.CodeNotFound, "套餐不存在")
		}
		return nil, fmt.Errorf("获取套餐失败: %w", err)
	}

	if req.SeriesID != nil && *req.SeriesID > 0 {
		_, err := s.packageSeriesStore.GetByID(ctx, *req.SeriesID)
		if err != nil {
			if err == gorm.ErrRecordNotFound {
				return nil, errors.New(errors.CodeNotFound, "套餐系列不存在")
			}
			return nil, fmt.Errorf("获取套餐系列失败: %w", err)
		}
		pkg.SeriesID = *req.SeriesID
	}

	if req.PackageName != nil {
		pkg.PackageName = *req.PackageName
	}
	if req.PackageType != nil {
		pkg.PackageType = *req.PackageType
	}
	if req.DurationMonths != nil {
		pkg.DurationMonths = *req.DurationMonths
	}
	if req.DataType != nil {
		pkg.DataType = *req.DataType
	}
	if req.RealDataMB != nil {
		pkg.RealDataMB = *req.RealDataMB
	}
	if req.VirtualDataMB != nil {
		pkg.VirtualDataMB = *req.VirtualDataMB
	}
	if req.DataAmountMB != nil {
		pkg.DataAmountMB = *req.DataAmountMB
	}
	if req.Price != nil {
		pkg.Price = *req.Price
	}
	if req.SuggestedCostPrice != nil {
		pkg.SuggestedCostPrice = *req.SuggestedCostPrice
	}
	if req.SuggestedRetailPrice != nil {
		pkg.SuggestedRetailPrice = *req.SuggestedRetailPrice
	}
	pkg.Updater = currentUserID

	if err := s.packageStore.Update(ctx, pkg); err != nil {
		return nil, fmt.Errorf("更新套餐失败: %w", err)
	}

	return s.toResponse(pkg), nil
}

func (s *Service) Delete(ctx context.Context, id uint) error {
	_, err := s.packageStore.GetByID(ctx, id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return errors.New(errors.CodeNotFound, "套餐不存在")
		}
		return fmt.Errorf("获取套餐失败: %w", err)
	}

	if err := s.packageStore.Delete(ctx, id); err != nil {
		return fmt.Errorf("删除套餐失败: %w", err)
	}

	return nil
}

func (s *Service) List(ctx context.Context, req *dto.PackageListRequest) ([]*dto.PackageResponse, int64, error) {
	opts := &store.QueryOptions{
		Page:     req.Page,
		PageSize: req.PageSize,
		OrderBy:  "id DESC",
	}
	if opts.Page == 0 {
		opts.Page = 1
	}
	if opts.PageSize == 0 {
		opts.PageSize = constants.DefaultPageSize
	}

	filters := make(map[string]interface{})
	if req.PackageName != nil {
		filters["package_name"] = *req.PackageName
	}
	if req.SeriesID != nil {
		filters["series_id"] = *req.SeriesID
	}
	if req.Status != nil {
		filters["status"] = *req.Status
	}
	if req.ShelfStatus != nil {
		filters["shelf_status"] = *req.ShelfStatus
	}
	if req.PackageType != nil {
		filters["package_type"] = *req.PackageType
	}

	packages, total, err := s.packageStore.List(ctx, opts, filters)
	if err != nil {
		return nil, 0, fmt.Errorf("查询套餐列表失败: %w", err)
	}

	responses := make([]*dto.PackageResponse, len(packages))
	for i, pkg := range packages {
		responses[i] = s.toResponse(pkg)
	}

	return responses, total, 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")
	}

	pkg, err := s.packageStore.GetByID(ctx, id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return errors.New(errors.CodeNotFound, "套餐不存在")
		}
		return fmt.Errorf("获取套餐失败: %w", err)
	}

	pkg.Status = status
	pkg.Updater = currentUserID

	if status == constants.StatusDisabled {
		pkg.ShelfStatus = 2
	}

	if err := s.packageStore.Update(ctx, pkg); err != nil {
		return fmt.Errorf("更新套餐状态失败: %w", err)
	}

	return nil
}

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

	pkg, err := s.packageStore.GetByID(ctx, id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return errors.New(errors.CodeNotFound, "套餐不存在")
		}
		return fmt.Errorf("获取套餐失败: %w", err)
	}

	if shelfStatus == 1 && pkg.Status == constants.StatusDisabled {
		return errors.New(errors.CodeInvalidStatus, "禁用的套餐不能上架，请先启用")
	}

	pkg.ShelfStatus = shelfStatus
	pkg.Updater = currentUserID

	if err := s.packageStore.Update(ctx, pkg); err != nil {
		return fmt.Errorf("更新套餐上架状态失败: %w", err)
	}

	return nil
}

func (s *Service) toResponse(pkg *model.Package) *dto.PackageResponse {
	var seriesID *uint
	if pkg.SeriesID > 0 {
		seriesID = &pkg.SeriesID
	}
	return &dto.PackageResponse{
		ID:                   pkg.ID,
		PackageCode:          pkg.PackageCode,
		PackageName:          pkg.PackageName,
		SeriesID:             seriesID,
		PackageType:          pkg.PackageType,
		DurationMonths:       pkg.DurationMonths,
		DataType:             pkg.DataType,
		RealDataMB:           pkg.RealDataMB,
		VirtualDataMB:        pkg.VirtualDataMB,
		DataAmountMB:         pkg.DataAmountMB,
		Price:                pkg.Price,
		SuggestedCostPrice:   pkg.SuggestedCostPrice,
		SuggestedRetailPrice: pkg.SuggestedRetailPrice,
		Status:               pkg.Status,
		ShelfStatus:          pkg.ShelfStatus,
		CreatedAt:            pkg.CreatedAt.Format(time.RFC3339),
		UpdatedAt:            pkg.UpdatedAt.Format(time.RFC3339),
	}
}