package tencentoss

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"io/fs"
	"mime/multipart"
	"net/http"
	"net/url"
	"os"
	"path"

	"management/internal/config"
	fileutil "management/internal/pkg/file"

	"github.com/h2non/filetype"
	"github.com/tencentyun/cos-go-sdk-v5"
)

var engine *cos.Client

func Init() error {
	u, err := url.Parse(fmt.Sprintf("https://%s.cos.%s.myqcloud.com", config.File.TencentUpload.Bucket, config.File.TencentUpload.Region))
	if err != nil {
		return err
	}

	b := &cos.BaseURL{BucketURL: u}
	engine = cos.NewClient(b, &http.Client{
		Transport: &cos.AuthorizationTransport{
			// 通过环境变量获取密钥
			// 环境变量 SECRETID 表示用户的 SecretId，登录访问管理控制台查看密钥，https://console.cloud.tencent.com/cam/capi
			SecretID: config.File.TencentUpload.AccessKeyID, // 用户的 SecretId，建议使用子账号密钥，授权遵循最小权限指引，降低使用风险。子账号密钥获取可参见 https://cloud.tencent.com/document/product/598/37140
			// 环境变量 SECRETKEY 表示用户的 SecretKey，登录访问管理控制台查看密钥，https://console.cloud.tencent.com/cam/capi
			SecretKey: config.File.TencentUpload.AccessKeySecret, // 用户的 SecretKey，建议使用子账号密钥，授权遵循最小权限指引，降低使用风险。子账号密钥获取可参见 https://cloud.tencent.com/document/product/598/37140
		},
	})

	return nil
}

func UploadFile(ctx context.Context, file *multipart.FileHeader, t fileutil.FileType) (string, error) {
	if file.Size > config.File.TencentUpload.AllowFileMaxSize {
		return "", errors.New("failed to receive file too large")
	}

	fileOpen, err := file.Open()
	if err != nil {
		return "", errors.New("failed to file open")
	}
	defer func(fileOpen multipart.File) {
		_ = fileOpen.Close()
	}(fileOpen)

	fileBytes, err := io.ReadAll(fileOpen)
	if err != nil {
		return "", errors.New("failed to read file")
	}

	if t == fileutil.IMG {
		// 判断是不是图片
		if !filetype.IsImage(fileBytes) {
			return "", fileutil.ErrUnsupported
		}
	}

	kind, err := filetype.Match(fileBytes)
	if err != nil || kind == filetype.Unknown {
		return "", errors.New("failed to get file type")
	}

	filename := fileutil.GenFilename(kind.Extension)
	imgPath := path.Join(fileutil.GetPath(), filename)
	_, err = engine.Object.Put(ctx, imgPath, bytes.NewReader(fileBytes), nil)
	if err != nil {
		return "", err
	}

	return imgPath, nil
}

func UploadFileOther(ctx context.Context, p string, t fileutil.FileType) (string, error) {
	file, err := os.Open(p)
	if err != nil {
		return "", err
	}
	defer func(file *os.File) {
		_ = file.Close()
	}(file)

	fileBytes, err := io.ReadAll(file)
	if err != nil {
		return "", errors.New("failed to read file")
	}

	if t == fileutil.IMG {
		// 判断是不是图片
		if !filetype.IsImage(fileBytes) {
			return "", fileutil.ErrUnsupported
		}
	}

	kind, err := filetype.Match(fileBytes)
	if err != nil || kind == filetype.Unknown {
		return "", errors.New("failed to get file type")
	}

	filename := fileutil.GenFilename(kind.Extension)
	imgPath := path.Join(fileutil.GetPath(), filename)
	_, err = engine.Object.Put(ctx, imgPath, bytes.NewReader(fileBytes), nil)
	if err != nil {
		return "", err
	}

	return imgPath, nil
}

func UploadFileByFS(ctx context.Context, file fs.File, t fileutil.FileType) (string, error) {
	fileBytes, err := io.ReadAll(file)
	if err != nil {
		return "", errors.New("failed to read file")
	}

	if t == fileutil.IMG {
		// 判断是不是图片
		if !filetype.IsImage(fileBytes) {
			return "", fileutil.ErrUnsupported
		}
	}

	kind, err := filetype.Match(fileBytes)
	if err != nil || kind == filetype.Unknown {
		return "", errors.New("failed to get file type")
	}

	filename := fileutil.GenFilename(kind.Extension)
	imgPath := path.Join(fileutil.GetPath(), filename)
	_, err = engine.Object.Put(ctx, imgPath, bytes.NewReader(fileBytes), nil)
	if err != nil {
		return "", err
	}

	return imgPath, nil
}

func DownloadFile(ctx context.Context, name string) ([]byte, error) {
	resp, err := engine.Object.Get(ctx, name, nil)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	bs, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	return bs, nil
}