package product

import (
	"context"
	"fmt"
	"io"
	"mime/multipart"
	"path/filepath"
	"strings"

	"tyapi-server/internal/domains/product/entities"
	"tyapi-server/internal/domains/product/repositories"

	"github.com/shopspring/decimal"
)

// UIComponentApplicationService UI组件应用服务接口
type UIComponentApplicationService interface {
	// 基本CRUD操作
	CreateUIComponent(ctx context.Context, req CreateUIComponentRequest) (entities.UIComponent, error)
	CreateUIComponentWithFile(ctx context.Context, req CreateUIComponentRequest, file *multipart.FileHeader) (entities.UIComponent, error)
	CreateUIComponentWithFiles(ctx context.Context, req CreateUIComponentRequest, files []*multipart.FileHeader) (entities.UIComponent, error)
	CreateUIComponentWithFilesAndPaths(ctx context.Context, req CreateUIComponentRequest, files []*multipart.FileHeader, paths []string) (entities.UIComponent, error)
	GetUIComponentByID(ctx context.Context, id string) (*entities.UIComponent, error)
	GetUIComponentByCode(ctx context.Context, code string) (*entities.UIComponent, error)
	UpdateUIComponent(ctx context.Context, req UpdateUIComponentRequest) error
	DeleteUIComponent(ctx context.Context, id string) error
	ListUIComponents(ctx context.Context, req ListUIComponentsRequest) (ListUIComponentsResponse, error)

	// 文件操作
	UploadUIComponentFile(ctx context.Context, id string, file *multipart.FileHeader) (string, error)
	UploadAndExtractUIComponentFile(ctx context.Context, id string, file *multipart.FileHeader) error
	DownloadUIComponentFile(ctx context.Context, id string) (string, error)
	GetUIComponentFolderContent(ctx context.Context, id string) ([]FileInfo, error)
	DeleteUIComponentFolder(ctx context.Context, id string) error

	// 产品关联操作
	AssociateUIComponentToProduct(ctx context.Context, req AssociateUIComponentRequest) error
	GetProductUIComponents(ctx context.Context, productID string) ([]entities.ProductUIComponent, error)
	RemoveUIComponentFromProduct(ctx context.Context, productID, componentID string) error
}

// CreateUIComponentRequest 创建UI组件请求
type CreateUIComponentRequest struct {
	ComponentCode string `json:"component_code" binding:"required"`
	ComponentName string `json:"component_name" binding:"required"`
	Description   string `json:"description"`
	Version       string `json:"version"`
	IsActive      bool   `json:"is_active"`
	SortOrder     int    `json:"sort_order"`
}

// UpdateUIComponentRequest 更新UI组件请求
type UpdateUIComponentRequest struct {
	ID            string `json:"id" binding:"required"`
	ComponentCode string `json:"component_code"`
	ComponentName string `json:"component_name"`
	Description   string `json:"description"`
	Version       string `json:"version"`
	IsActive      *bool  `json:"is_active"`
	SortOrder     *int   `json:"sort_order"`
}

// ListUIComponentsRequest 获取UI组件列表请求
type ListUIComponentsRequest struct {
	Page      int    `form:"page,default=1"`
	PageSize  int    `form:"page_size,default=10"`
	Keyword   string `form:"keyword"`
	IsActive  *bool  `form:"is_active"`
	SortBy    string `form:"sort_by,default=sort_order"`
	SortOrder string `form:"sort_order,default=asc"`
}

// ListUIComponentsResponse 获取UI组件列表响应
type ListUIComponentsResponse struct {
	Components []entities.UIComponent `json:"components"`
	Total      int64                  `json:"total"`
	Page       int                    `json:"page"`
	PageSize   int                    `json:"page_size"`
}

// AssociateUIComponentRequest 关联UI组件到产品请求
type AssociateUIComponentRequest struct {
	ProductID     string  `json:"product_id" binding:"required"`
	UIComponentID string  `json:"ui_component_id" binding:"required"`
	Price         float64 `json:"price" binding:"required,min=0"`
	IsEnabled     bool    `json:"is_enabled"`
}

// UIComponentApplicationServiceImpl UI组件应用服务实现
type UIComponentApplicationServiceImpl struct {
	uiComponentRepo        repositories.UIComponentRepository
	productUIComponentRepo repositories.ProductUIComponentRepository
	fileStorageService     FileStorageService
	fileService            UIComponentFileService
}

// FileStorageService 文件存储服务接口
type FileStorageService interface {
	StoreFile(ctx context.Context, file io.Reader, filename string) (string, error)
	GetFileURL(ctx context.Context, filePath string) (string, error)
	DeleteFile(ctx context.Context, filePath string) error
}

// NewUIComponentApplicationService 创建UI组件应用服务
func NewUIComponentApplicationService(
	uiComponentRepo repositories.UIComponentRepository,
	productUIComponentRepo repositories.ProductUIComponentRepository,
	fileStorageService FileStorageService,
	fileService UIComponentFileService,
) UIComponentApplicationService {
	return &UIComponentApplicationServiceImpl{
		uiComponentRepo:        uiComponentRepo,
		productUIComponentRepo: productUIComponentRepo,
		fileStorageService:     fileStorageService,
		fileService:            fileService,
	}
}

// CreateUIComponent 创建UI组件
func (s *UIComponentApplicationServiceImpl) CreateUIComponent(ctx context.Context, req CreateUIComponentRequest) (entities.UIComponent, error) {
	// 检查编码是否已存在
	existing, _ := s.uiComponentRepo.GetByCode(ctx, req.ComponentCode)
	if existing != nil {
		return entities.UIComponent{}, ErrComponentCodeAlreadyExists
	}

	component := entities.UIComponent{
		ComponentCode: req.ComponentCode,
		ComponentName: req.ComponentName,
		Description:   req.Description,
		Version:       req.Version,
		IsActive:      req.IsActive,
		SortOrder:     req.SortOrder,
	}

	return s.uiComponentRepo.Create(ctx, component)
}

// CreateUIComponentWithFile 创建UI组件并上传文件
func (s *UIComponentApplicationServiceImpl) CreateUIComponentWithFile(ctx context.Context, req CreateUIComponentRequest, file *multipart.FileHeader) (entities.UIComponent, error) {
	// 检查编码是否已存在
	existing, _ := s.uiComponentRepo.GetByCode(ctx, req.ComponentCode)
	if existing != nil {
		return entities.UIComponent{}, ErrComponentCodeAlreadyExists
	}

	// 创建组件
	component := entities.UIComponent{
		ComponentCode: req.ComponentCode,
		ComponentName: req.ComponentName,
		Description:   req.Description,
		Version:       req.Version,
		IsActive:      req.IsActive,
		SortOrder:     req.SortOrder,
	}

	createdComponent, err := s.uiComponentRepo.Create(ctx, component)
	if err != nil {
		return entities.UIComponent{}, err
	}

	// 如果有文件，则上传并处理文件
	if file != nil {
		// 打开上传的文件
		src, err := file.Open()
		if err != nil {
			// 删除已创建的组件记录
			_ = s.uiComponentRepo.Delete(ctx, createdComponent.ID)
			return entities.UIComponent{}, fmt.Errorf("打开上传文件失败: %w", err)
		}
		defer src.Close()

		// 上传并解压文件
		if err := s.fileService.UploadAndExtract(ctx, createdComponent.ID, createdComponent.ComponentCode, src, file.Filename); err != nil {
			// 删除已创建的组件记录
			_ = s.uiComponentRepo.Delete(ctx, createdComponent.ID)
			return entities.UIComponent{}, err
		}

		// 获取文件类型
		fileType := strings.ToLower(filepath.Ext(file.Filename))

		// 更新组件信息
		folderPath := "resources/Pure Component/src/ui"
		createdComponent.FolderPath = &folderPath
		createdComponent.FileType = &fileType

		// 仅对ZIP文件设置已解压标记
		if fileType == ".zip" {
			createdComponent.IsExtracted = true
		}

		// 更新组件信息
		err = s.uiComponentRepo.Update(ctx, createdComponent)
		if err != nil {
			// 尝试删除已创建的组件记录
			_ = s.uiComponentRepo.Delete(ctx, createdComponent.ID)
			return entities.UIComponent{}, err
		}

		return createdComponent, nil
	}

	return createdComponent, nil
}

// CreateUIComponentWithFiles 创建UI组件并上传多个文件
func (s *UIComponentApplicationServiceImpl) CreateUIComponentWithFiles(ctx context.Context, req CreateUIComponentRequest, files []*multipart.FileHeader) (entities.UIComponent, error) {
	// 检查编码是否已存在
	existing, _ := s.uiComponentRepo.GetByCode(ctx, req.ComponentCode)
	if existing != nil {
		return entities.UIComponent{}, ErrComponentCodeAlreadyExists
	}

	// 创建组件
	component := entities.UIComponent{
		ComponentCode: req.ComponentCode,
		ComponentName: req.ComponentName,
		Description:   req.Description,
		Version:       req.Version,
		IsActive:      req.IsActive,
		SortOrder:     req.SortOrder,
	}

	createdComponent, err := s.uiComponentRepo.Create(ctx, component)
	if err != nil {
		return entities.UIComponent{}, err
	}

	// 如果有文件，则上传并处理文件
	if len(files) > 0 {
		// 处理每个文件
		var extractedFiles []string
		for _, fileHeader := range files {
			// 打开上传的文件
			src, err := fileHeader.Open()
			if err != nil {
				// 删除已创建的组件记录
				_ = s.uiComponentRepo.Delete(ctx, createdComponent.ID)
				return entities.UIComponent{}, fmt.Errorf("打开上传文件失败: %w", err)
			}

			// 上传并解压文件
			if err := s.fileService.UploadAndExtract(ctx, createdComponent.ID, createdComponent.ComponentCode, src, fileHeader.Filename); err != nil {
				src.Close()
				// 删除已创建的组件记录
				_ = s.uiComponentRepo.Delete(ctx, createdComponent.ID)
				return entities.UIComponent{}, err
			}
			src.Close()

			// 记录已处理的文件，用于日志
			extractedFiles = append(extractedFiles, fileHeader.Filename)
		}

		// 更新组件信息
		folderPath := "resources/Pure Component/src/ui"
		createdComponent.FolderPath = &folderPath

		// 检查是否有ZIP文件
		hasZipFile := false
		for _, fileHeader := range files {
			if strings.HasSuffix(strings.ToLower(fileHeader.Filename), ".zip") {
				hasZipFile = true
				break
			}
		}

		// 如果有ZIP文件，则标记为已解压
		if hasZipFile {
			createdComponent.IsExtracted = true
		}

		// 更新组件信息
		err = s.uiComponentRepo.Update(ctx, createdComponent)
		if err != nil {
			// 尝试删除已创建的组件记录
			_ = s.uiComponentRepo.Delete(ctx, createdComponent.ID)
			return entities.UIComponent{}, err
		}
	}

	return createdComponent, nil
}

// CreateUIComponentWithFilesAndPaths 创建UI组件并上传带路径的文件
func (s *UIComponentApplicationServiceImpl) CreateUIComponentWithFilesAndPaths(ctx context.Context, req CreateUIComponentRequest, files []*multipart.FileHeader, paths []string) (entities.UIComponent, error) {
	// 检查编码是否已存在
	existing, _ := s.uiComponentRepo.GetByCode(ctx, req.ComponentCode)
	if existing != nil {
		return entities.UIComponent{}, ErrComponentCodeAlreadyExists
	}

	// 创建组件
	component := entities.UIComponent{
		ComponentCode: req.ComponentCode,
		ComponentName: req.ComponentName,
		Description:   req.Description,
		Version:       req.Version,
		IsActive:      req.IsActive,
		SortOrder:     req.SortOrder,
	}

	createdComponent, err := s.uiComponentRepo.Create(ctx, component)
	if err != nil {
		return entities.UIComponent{}, err
	}

	// 如果有文件，则上传并处理文件
	if len(files) > 0 {
		// 打开所有文件
		var readers []io.Reader
		var filenames []string
		var filePaths []string

		for i, fileHeader := range files {
			// 打开上传的文件
			src, err := fileHeader.Open()
			if err != nil {
				// 关闭已打开的文件
				for _, r := range readers {
					if closer, ok := r.(io.Closer); ok {
						closer.Close()
					}
				}
				// 删除已创建的组件记录
				_ = s.uiComponentRepo.Delete(ctx, createdComponent.ID)
				return entities.UIComponent{}, fmt.Errorf("打开上传文件失败: %w", err)
			}

			readers = append(readers, src)
			filenames = append(filenames, fileHeader.Filename)

			// 确定文件路径
			var path string
			if i < len(paths) && paths[i] != "" {
				path = paths[i]
			} else {
				path = fileHeader.Filename
			}
			filePaths = append(filePaths, path)
		}

		// 使用新的批量上传方法
		if err := s.fileService.UploadMultipleFiles(ctx, createdComponent.ID, createdComponent.ComponentCode, readers, filenames, filePaths); err != nil {
			// 关闭已打开的文件
			for _, r := range readers {
				if closer, ok := r.(io.Closer); ok {
					closer.Close()
				}
			}
			// 删除已创建的组件记录
			_ = s.uiComponentRepo.Delete(ctx, createdComponent.ID)
			return entities.UIComponent{}, err
		}

		// 关闭所有文件
		for _, r := range readers {
			if closer, ok := r.(io.Closer); ok {
				closer.Close()
			}
		}

		// 更新组件信息
		folderPath := "resources/Pure Component/src/ui"
		createdComponent.FolderPath = &folderPath

		// 检查是否有ZIP文件
		hasZipFile := false
		for _, fileHeader := range files {
			if strings.HasSuffix(strings.ToLower(fileHeader.Filename), ".zip") {
				hasZipFile = true
				break
			}
		}

		// 如果有ZIP文件，则标记为已解压
		if hasZipFile {
			createdComponent.IsExtracted = true
		}

		// 更新组件信息
		err = s.uiComponentRepo.Update(ctx, createdComponent)
		if err != nil {
			// 尝试删除已创建的组件记录
			_ = s.uiComponentRepo.Delete(ctx, createdComponent.ID)
			return entities.UIComponent{}, err
		}
	}

	return createdComponent, nil
}

// GetUIComponentByID 根据ID获取UI组件
func (s *UIComponentApplicationServiceImpl) GetUIComponentByID(ctx context.Context, id string) (*entities.UIComponent, error) {
	return s.uiComponentRepo.GetByID(ctx, id)
}

// GetUIComponentByCode 根据编码获取UI组件
func (s *UIComponentApplicationServiceImpl) GetUIComponentByCode(ctx context.Context, code string) (*entities.UIComponent, error) {
	return s.uiComponentRepo.GetByCode(ctx, code)
}

// UpdateUIComponent 更新UI组件
func (s *UIComponentApplicationServiceImpl) UpdateUIComponent(ctx context.Context, req UpdateUIComponentRequest) error {
	component, err := s.uiComponentRepo.GetByID(ctx, req.ID)
	if err != nil {
		return err
	}
	if component == nil {
		return ErrComponentNotFound
	}

	// 如果更新编码，检查是否与其他组件冲突
	if req.ComponentCode != "" && req.ComponentCode != component.ComponentCode {
		existing, _ := s.uiComponentRepo.GetByCode(ctx, req.ComponentCode)
		if existing != nil && existing.ID != req.ID {
			return ErrComponentCodeAlreadyExists
		}
		component.ComponentCode = req.ComponentCode
	}

	if req.ComponentName != "" {
		component.ComponentName = req.ComponentName
	}
	if req.Description != "" {
		component.Description = req.Description
	}
	if req.Version != "" {
		component.Version = req.Version
	}
	if req.IsActive != nil {
		component.IsActive = *req.IsActive
	}
	if req.SortOrder != nil {
		component.SortOrder = *req.SortOrder
	}

	return s.uiComponentRepo.Update(ctx, *component)
}

// DeleteUIComponent 删除UI组件
func (s *UIComponentApplicationServiceImpl) DeleteUIComponent(ctx context.Context, id string) error {
	component, err := s.uiComponentRepo.GetByID(ctx, id)
	if err != nil {
		return err
	}
	if component == nil {
		return ErrComponentNotFound
	}

	// 删除关联的文件
	if component.FilePath != nil {
		_ = s.fileStorageService.DeleteFile(ctx, *component.FilePath)
	}

	return s.uiComponentRepo.Delete(ctx, id)
}

// ListUIComponents 获取UI组件列表
func (s *UIComponentApplicationServiceImpl) ListUIComponents(ctx context.Context, req ListUIComponentsRequest) (ListUIComponentsResponse, error) {
	filters := make(map[string]interface{})

	if req.Keyword != "" {
		filters["keyword"] = req.Keyword
	}
	if req.IsActive != nil {
		filters["is_active"] = *req.IsActive
	}
	filters["page"] = req.Page
	filters["page_size"] = req.PageSize
	filters["sort_by"] = req.SortBy
	filters["sort_order"] = req.SortOrder

	components, total, err := s.uiComponentRepo.List(ctx, filters)
	if err != nil {
		return ListUIComponentsResponse{}, err
	}

	return ListUIComponentsResponse{
		Components: components,
		Total:      total,
		Page:       req.Page,
		PageSize:   req.PageSize,
	}, nil
}

// UploadUIComponentFile 上传UI组件文件
func (s *UIComponentApplicationServiceImpl) UploadUIComponentFile(ctx context.Context, id string, file *multipart.FileHeader) (string, error) {
	component, err := s.uiComponentRepo.GetByID(ctx, id)
	if err != nil {
		return "", err
	}
	if component == nil {
		return "", ErrComponentNotFound
	}

	// 检查文件大小（100MB）
	if file.Size > 100*1024*1024 {
		return "", ErrInvalidFileType // 复用此错误表示文件太大
	}

	// 打开上传的文件
	src, err := file.Open()
	if err != nil {
		return "", err
	}
	defer src.Close()

	// 生成文件路径
	filePath := filepath.Join("ui-components", id+"_"+file.Filename)

	// 存储文件
	storedPath, err := s.fileStorageService.StoreFile(ctx, src, filePath)
	if err != nil {
		return "", err
	}

	// 删除旧文件
	if component.FilePath != nil {
		_ = s.fileStorageService.DeleteFile(ctx, *component.FilePath)
	}

	// 获取文件类型
	fileType := strings.ToLower(filepath.Ext(file.Filename))

	// 更新组件信息
	component.FilePath = &storedPath
	component.FileSize = &file.Size
	component.FileType = &fileType
	if err := s.uiComponentRepo.Update(ctx, *component); err != nil {
		// 如果更新失败，尝试删除已上传的文件
		_ = s.fileStorageService.DeleteFile(ctx, storedPath)
		return "", err
	}

	return storedPath, nil
}

// DownloadUIComponentFile 下载UI组件文件
func (s *UIComponentApplicationServiceImpl) DownloadUIComponentFile(ctx context.Context, id string) (string, error) {
	component, err := s.uiComponentRepo.GetByID(ctx, id)
	if err != nil {
		return "", err
	}
	if component == nil {
		return "", ErrComponentNotFound
	}

	if component.FilePath == nil {
		return "", ErrComponentFileNotFound
	}

	return s.fileStorageService.GetFileURL(ctx, *component.FilePath)
}

// AssociateUIComponentToProduct 关联UI组件到产品
func (s *UIComponentApplicationServiceImpl) AssociateUIComponentToProduct(ctx context.Context, req AssociateUIComponentRequest) error {
	// 检查组件是否存在
	component, err := s.uiComponentRepo.GetByID(ctx, req.UIComponentID)
	if err != nil {
		return err
	}
	if component == nil {
		return ErrComponentNotFound
	}

	// 创建关联
	relation := entities.ProductUIComponent{
		ProductID:     req.ProductID,
		UIComponentID: req.UIComponentID,
		Price:         decimal.NewFromFloat(req.Price),
		IsEnabled:     req.IsEnabled,
	}

	_, err = s.productUIComponentRepo.Create(ctx, relation)
	return err
}

// GetProductUIComponents 获取产品的UI组件列表
func (s *UIComponentApplicationServiceImpl) GetProductUIComponents(ctx context.Context, productID string) ([]entities.ProductUIComponent, error) {
	return s.productUIComponentRepo.GetByProductID(ctx, productID)
}

// RemoveUIComponentFromProduct 从产品中移除UI组件
func (s *UIComponentApplicationServiceImpl) RemoveUIComponentFromProduct(ctx context.Context, productID, componentID string) error {
	// 查找关联记录
	relations, err := s.productUIComponentRepo.GetByProductID(ctx, productID)
	if err != nil {
		return err
	}

	// 找到要删除的关联记录
	var relationID string
	for _, relation := range relations {
		if relation.UIComponentID == componentID {
			relationID = relation.ID
			break
		}
	}

	if relationID == "" {
		return ErrProductComponentRelationNotFound
	}

	return s.productUIComponentRepo.Delete(ctx, relationID)
}

// UploadAndExtractUIComponentFile 上传并解压UI组件文件
func (s *UIComponentApplicationServiceImpl) UploadAndExtractUIComponentFile(ctx context.Context, id string, file *multipart.FileHeader) error {
	// 获取组件信息
	component, err := s.uiComponentRepo.GetByID(ctx, id)
	if err != nil {
		return err
	}
	if component == nil {
		return ErrComponentNotFound
	}

	// 打开上传的文件
	src, err := file.Open()
	if err != nil {
		return fmt.Errorf("打开上传文件失败: %w", err)
	}
	defer src.Close()

	// 上传并解压文件
	if err := s.fileService.UploadAndExtract(ctx, id, component.ComponentCode, src, file.Filename); err != nil {
		return err
	}

	// 获取文件类型
	fileType := strings.ToLower(filepath.Ext(file.Filename))

	// 更新组件信息
	folderPath := "resources/Pure Component/src/ui"
	component.FolderPath = &folderPath
	component.FileType = &fileType

	// 仅对ZIP文件设置已解压标记
	if fileType == ".zip" {
		component.IsExtracted = true
	}

	return s.uiComponentRepo.Update(ctx, *component)
}

// GetUIComponentFolderContent 获取UI组件文件夹内容
func (s *UIComponentApplicationServiceImpl) GetUIComponentFolderContent(ctx context.Context, id string) ([]FileInfo, error) {
	// 获取组件信息
	component, err := s.uiComponentRepo.GetByID(ctx, id)
	if err != nil {
		return nil, err
	}
	if component == nil {
		return nil, ErrComponentNotFound
	}

	// 如果没有文件夹路径，返回空
	if component.FolderPath == nil {
		return []FileInfo{}, nil
	}

	// 获取文件夹内容
	return s.fileService.GetFolderContent(*component.FolderPath)
}

// DeleteUIComponentFolder 删除UI组件文件夹
func (s *UIComponentApplicationServiceImpl) DeleteUIComponentFolder(ctx context.Context, id string) error {
	// 获取组件信息
	component, err := s.uiComponentRepo.GetByID(ctx, id)
	if err != nil {
		return err
	}
	if component == nil {
		return ErrComponentNotFound
	}

	// 注意：我们不再删除整个UI目录，因为所有组件共享同一个目录
	// 这里只更新组件信息，标记为未上传状态
	// 更新组件信息
	component.FolderPath = nil
	component.IsExtracted = false
	return s.uiComponentRepo.Update(ctx, *component)
}