package proxy

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"mime"
	"mime/multipart"
	"net/http"
	"net/textproto"
	"path/filepath"
	"strconv"
	"strings"
	"time"
	"videoweb/pub/common/log"
	"videoweb/pub/pubdef"
)

const mediaAutopublishImagePath = "/media/web/autopublish/image"

type mediaImageUploadResp struct {
	Code int `json:"code"`
	Data struct {
		Id           string `json:"id"`
		SourceNameFs string `json:"sourceNameFs"`
	} `json:"data"`
	Msg string `json:"msg"`
}

// UploadAutopublishImage 按 App /api/app/upload/image 同样方式上传到 media
// POST {media}/media/web/autopublish/image，表单字段 file + appId，不加盖水印。
func UploadAutopublishImage(fileName string, data []byte) (string, error) {
	if len(data) == 0 {
		return "", fmt.Errorf("图片内容为空")
	}
	fileName = sanitizeAutopublishFileName(fileName)

	var buf bytes.Buffer
	mw := multipart.NewWriter(&buf)
	if err := mw.WriteField("appId", strconv.Itoa(pubdef.AppId)); err != nil {
		return "", err
	}
	if err := writeAutopublishImageFile(mw, fileName, data); err != nil {
		return "", err
	}
	if err := mw.Close(); err != nil {
		return "", err
	}

	base := strings.TrimRight(DomainAddressRepair("", BucketVideoAddressV2), "/")
	if base == "" || (!strings.HasPrefix(base, "http://") && !strings.HasPrefix(base, "https://")) {
		return "", fmt.Errorf("media地址未配置")
	}
	url := base + mediaAutopublishImagePath
	req, err := http.NewRequest(http.MethodPost, url, &buf)
	if err != nil {
		return "", err
	}
	req.Header.Set("Content-Type", mw.FormDataContentType())

	cli := &http.Client{Timeout: 60 * time.Second}
	resp, err := cli.Do(req)
	if err != nil {
		log.Error("上传media图片失败", log.Any("url", url), log.E(err))
		return "", err
	}
	defer resp.Body.Close()
	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	if resp.StatusCode != http.StatusOK {
		return "", fmt.Errorf("media上传图片失败，状态码 %d，响应 %s", resp.StatusCode, trimRespBody(body))
	}

	var result mediaImageUploadResp
	if err = json.Unmarshal(body, &result); err != nil {
		return "", fmt.Errorf("解析media上传图片响应失败: %w，响应 %s", err, trimRespBody(body))
	}
	if result.Code != Success {
		msg := strings.TrimSpace(result.Msg)
		if msg == "" {
			msg = "unknown"
		}
		return "", fmt.Errorf("media上传图片失败: %s，响应 %s", msg, trimRespBody(body))
	}
	pathStr := strings.TrimSpace(result.Data.SourceNameFs)
	if pathStr == "" {
		return "", fmt.Errorf("media上传图片返回空路径")
	}
	return pathStr, nil
}

func writeAutopublishImageFile(mw *multipart.Writer, fileName string, data []byte) error {
	h := make(textproto.MIMEHeader)
	contentType := mime.TypeByExtension(strings.ToLower(filepath.Ext(fileName)))
	if contentType == "" {
		contentType = "image/jpeg"
	}
	h.Set("Content-Disposition", fmt.Sprintf(`form-data; name="file"; filename="%s"`, fileName))
	h.Set("Content-Type", contentType)
	part, err := mw.CreatePart(h)
	if err != nil {
		return err
	}
	_, err = part.Write(data)
	return err
}

func sanitizeAutopublishFileName(fileName string) string {
	fileName = filepath.Base(strings.TrimSpace(fileName))
	fileName = strings.ReplaceAll(fileName, `"`, "")
	if fileName == "" || fileName == "." || !strings.Contains(fileName, ".") {
		return "playlet_cover.jpg"
	}
	for _, r := range fileName {
		if r > 127 || r < 32 || r == '/' || r == '\\' {
			return "playlet_cover.jpg"
		}
	}
	return fileName
}

func trimRespBody(body []byte) string {
	s := strings.TrimSpace(string(body))
	if len(s) > 300 {
		return s[:300]
	}
	return s
}