package logic

import (
	"context"
	"fmt"
	"path/filepath"
	"time"

	"git.cialloo.com/CiallooWeb/Blog/app/internal/svc"
	"git.cialloo.com/CiallooWeb/Blog/app/internal/types"

	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/google/uuid"
	"github.com/zeromicro/go-zero/core/logx"
)

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

// Get presigned URL for file upload
func NewUploadPresignedURLLogic(ctx context.Context, svcCtx *svc.ServiceContext) *UploadPresignedURLLogic {
	return &UploadPresignedURLLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *UploadPresignedURLLogic) UploadPresignedURL(req *types.UploadPresignedURLReq) (resp *types.UploadPresignedURLResp, err error) {
	// Generate unique file key
	ext := filepath.Ext(req.FileName)
	fileKey := fmt.Sprintf("uploads/%s%s", uuid.New().String(), ext)

	// Calculate expiration time
	expiration := time.Duration(l.svcCtx.Config.S3.PresignedURLExpiration) * time.Second
	expireAt := time.Now().Add(expiration)

	// Create presigned client
	presignClient := s3.NewPresignClient(l.svcCtx.S3Client)

	// Generate presigned PUT URL
	putObjectInput := &s3.PutObjectInput{
		Bucket: &l.svcCtx.Config.S3.Bucket,
		Key:    &fileKey,
	}

	presignedReq, err := presignClient.PresignPutObject(l.ctx, putObjectInput, func(opts *s3.PresignOptions) {
		opts.Expires = expiration
	})
	if err != nil {
		l.Errorf("Failed to generate presigned URL: %v", err)
		return nil, err
	}

	// Insert record into tmpfiles table
	query := `INSERT INTO tmpfiles (file_name, key, presigned_url, expiration) VALUES ($1, $2, $3, $4)`
	_, err = l.svcCtx.DB.ExecContext(l.ctx, query, req.FileName, fileKey, presignedReq.URL, expireAt)
	if err != nil {
		l.Errorf("Failed to insert tmpfile record: %v", err)
		return nil, err
	}

	return &types.UploadPresignedURLResp{
		Url:      presignedReq.URL,
		FileKey:  fileKey,
		ExpireAt: expireAt.Unix(),
	}, nil
}