// Code scaffolded by goctl. Safe to edit.
// goctl 1.9.2

package file

import (
	"context"
	"fmt"
	"net/http"
	"path/filepath"
	"strings"
	"time"

	"github.com/google/uuid"
	"github.com/youruser/base/internal/svc"
	"github.com/youruser/base/internal/types"
	"github.com/youruser/base/model"

	"github.com/zeromicro/go-zero/core/logx"
)

type UploadFileLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

// 上传文件
func NewUploadFileLogic(ctx context.Context, svcCtx *svc.ServiceContext) *UploadFileLogic {
	return &UploadFileLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *UploadFileLogic) UploadFile(r *http.Request) (resp *types.FileInfo, err error) {
	// Get userId from context
	userId, _ := l.ctx.Value("userId").(int64)
	if userId == 0 {
		if num, ok := l.ctx.Value("userId").(interface{ Int64() (int64, error) }); ok {
			userId, _ = num.Int64()
		}
	}
	if userId == 0 {
		return nil, fmt.Errorf("unauthorized")
	}

	// Get file from multipart form
	formFile, header, err := r.FormFile("file")
	if err != nil {
		return nil, fmt.Errorf("failed to get upload file: %v", err)
	}
	defer formFile.Close()

	// Get optional form values
	category := r.FormValue("category")
	if category == "" {
		category = "default"
	}
	isPublicStr := r.FormValue("isPublic")
	isPublic := isPublicStr == "true" || isPublicStr == "1"

	// Get file metadata
	fileName := header.Filename
	fileSize := header.Size
	mimeType := header.Header.Get("Content-Type")
	if mimeType == "" {
		mimeType = "application/octet-stream"
	}

	// Generate storage key: {category}/{YYYY-MM}/{uuid}{ext}
	ext := filepath.Ext(fileName)
	now := time.Now()
	key := fmt.Sprintf("%s/%s/%s%s", category, now.Format("2006-01"), uuid.New().String(), ext)

	// Upload to storage
	if err := l.svcCtx.Storage.Upload(l.ctx, key, formFile, fileSize, mimeType); err != nil {
		return nil, fmt.Errorf("failed to upload file: %v", err)
	}

	// Insert file record
	fileRecord := &model.File{
		Name:        fileName,
		Key:         key,
		Size:        fileSize,
		MimeType:    mimeType,
		Category:    category,
		IsPublic:    isPublic,
		UserId:      userId,
		StorageType: l.svcCtx.Config.Storage.Type,
		Status:      1,
	}

	fileId, err := model.FileInsert(l.ctx, l.svcCtx.DB, fileRecord)
	if err != nil {
		// Cleanup uploaded file on DB failure
		if delErr := l.svcCtx.Storage.Delete(l.ctx, key); delErr != nil {
			l.Errorf("failed to cleanup file after DB error: %v", delErr)
		}
		return nil, fmt.Errorf("failed to save file record: %v", err)
	}

	// Build URL
	url, err := l.buildFileURL(fileId, key)
	if err != nil {
		return nil, fmt.Errorf("failed to get file URL: %v", err)
	}

	resp = &types.FileInfo{
		Id:          fileId,
		Name:        fileName,
		Key:         key,
		Size:        fileSize,
		MimeType:    mimeType,
		Category:    category,
		IsPublic:    isPublic,
		UserId:      userId,
		StorageType: l.svcCtx.Config.Storage.Type,
		Url:         url,
		CreatedAt:   fileRecord.CreatedAt.Format("2006-01-02 15:04:05"),
		UpdatedAt:   fileRecord.UpdatedAt.Format("2006-01-02 15:04:05"),
	}

	return resp, nil
}

// buildFileURL generates the appropriate URL for the file
func (l *UploadFileLogic) buildFileURL(fileId int64, key string) (string, error) {
	rawURL, err := l.svcCtx.Storage.GetURL(l.ctx, key)
	if err != nil {
		return "", err
	}

	// For local storage, return API endpoint URL
	if strings.HasPrefix(rawURL, "local://") {
		return fmt.Sprintf("/api/v1/file/%d/url", fileId), nil
	}

	// For OSS/MinIO, return signed URL directly
	return rawURL, nil
}