package handler

import (
	"bytes"
	"fmt"
	"image/gif"
	"image/jpeg"
	"image/png"
	"io"
	"math/rand"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"

	"soul-api/internal/database"
	"soul-api/internal/model"
)

const (
	uploadDirContent    = "uploads"
	maxImageBytes       = 5 * 1024 * 1024  // 5MB
	maxVideoBytes       = 100 * 1024 * 1024 // 100MB
	defaultImageQuality = 85
)

var (
	allowedImageTypes = map[string]bool{
		"image/jpeg": true, "image/png": true, "image/gif": true, "image/webp": true,
	}
	allowedVideoTypes = map[string]bool{
		"video/mp4": true, "video/quicktime": true, "video/webm": true, "video/x-msvideo": true,
	}
)

// UploadImagePost POST /api/miniprogram/upload/image 小程序-图片上传（支持压缩），优先 OSS
// 表单：file（必填）, folder（可选，默认 images）, quality（可选 1-100，默认 85）
func UploadImagePost(c *gin.Context) {
	file, err := c.FormFile("file")
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "请选择要上传的图片"})
		return
	}
	if file.Size > maxImageBytes {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "图片大小不能超过 5MB"})
		return
	}
	ct := file.Header.Get("Content-Type")
	if !allowedImageTypes[ct] && !strings.HasPrefix(ct, "image/") {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "仅支持 jpg/png/gif/webp 格式"})
		return
	}
	quality := defaultImageQuality
	if q := c.PostForm("quality"); q != "" {
		if qn, e := strconv.Atoi(q); e == nil && qn >= 1 && qn <= 100 {
			quality = qn
		}
	}
	folder := c.PostForm("folder")
	if folder == "" {
		folder = "images"
	}
	ext := filepath.Ext(file.Filename)
	if ext == "" {
		ext = ".jpg"
	}
	name := fmt.Sprintf("%d_%s%s", time.Now().UnixNano(), randomStrContent(6), ext)

	src, err := file.Open()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "error": "打开文件失败"})
		return
	}
	defer src.Close()
	data, err := io.ReadAll(src)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "error": "读取文件失败"})
		return
	}

	// JPEG 压缩
	var finalData []byte
	finalCt := ct
	if strings.Contains(ct, "jpeg") || strings.Contains(ct, "jpg") {
		if img, err := jpeg.Decode(bytes.NewReader(data)); err == nil {
			var buf bytes.Buffer
			if err := jpeg.Encode(&buf, img, &jpeg.Options{Quality: quality}); err == nil {
				finalData = buf.Bytes()
			}
		}
	} else if strings.Contains(ct, "png") {
		if img, err := png.Decode(bytes.NewReader(data)); err == nil {
			var buf bytes.Buffer
			if err := png.Encode(&buf, img); err == nil {
				finalData = buf.Bytes()
			}
		}
	} else if strings.Contains(ct, "gif") {
		if img, err := gif.Decode(bytes.NewReader(data)); err == nil {
			var buf bytes.Buffer
			if err := gif.Encode(&buf, img, nil); err == nil {
				finalData = buf.Bytes()
			}
		}
	}
	if finalData == nil {
		finalData = data
	}

	// 优先 OSS 上传
	if ossURL, err := ossUploadBytes(finalData, folder, name, finalCt); err == nil {
		c.JSON(http.StatusOK, gin.H{
			"success": true, "url": ossURL,
			"data": gin.H{"url": ossURL, "fileName": name, "size": int64(len(finalData)), "type": ct, "quality": quality, "storage": "oss"},
		})
		return
	}

	// 回退本地存储
	dir := filepath.Join(uploadDirContent, folder)
	_ = os.MkdirAll(dir, 0755)
	dst := filepath.Join(dir, name)
	if err := os.WriteFile(dst, finalData, 0644); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "error": "保存失败"})
		return
	}
	url := "/" + filepath.ToSlash(filepath.Join(uploadDirContent, folder, name))
	c.JSON(http.StatusOK, gin.H{"success": true, "url": url, "data": gin.H{"url": url, "fileName": name, "size": int64(len(finalData)), "type": ct, "quality": quality, "storage": "local"}})
}

// UploadVideoPost POST /api/miniprogram/upload/video 小程序-视频上传，优先 OSS
// 表单：file（必填）, folder（可选，默认 videos）
func UploadVideoPost(c *gin.Context) {
	file, err := c.FormFile("file")
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "请选择要上传的视频"})
		return
	}
	if file.Size > maxVideoBytes {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "视频大小不能超过 100MB"})
		return
	}
	ct := file.Header.Get("Content-Type")
	if !allowedVideoTypes[ct] && !strings.HasPrefix(ct, "video/") {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "error": "仅支持 mp4/mov/avi 等视频格式"})
		return
	}
	folder := c.PostForm("folder")
	if folder == "" {
		folder = "videos"
	}
	ext := filepath.Ext(file.Filename)
	if ext == "" {
		ext = ".mp4"
	}
	name := fmt.Sprintf("%d_%s%s", time.Now().UnixNano(), randomStrContent(8), ext)

	// 优先 OSS 上传
	if ossCfg := getOssConfig(); ossCfg != nil {
		src, err := file.Open()
		if err == nil {
			defer src.Close()
			if ossURL, err := ossUploadFile(src, folder, name); err == nil {
				c.JSON(http.StatusOK, gin.H{
					"success": true, "url": ossURL,
					"data": gin.H{"url": ossURL, "fileName": name, "size": file.Size, "type": ct, "folder": folder, "storage": "oss"},
				})
				return
			}
		}
	}

	// 回退本地存储
	dir := filepath.Join(uploadDirContent, folder)
	_ = os.MkdirAll(dir, 0755)
	dst := filepath.Join(dir, name)
	if err := c.SaveUploadedFile(file, dst); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "error": "保存失败"})
		return
	}
	url := "/" + filepath.ToSlash(filepath.Join(uploadDirContent, folder, name))
	c.JSON(http.StatusOK, gin.H{
		"success": true, "url": url,
		"data": gin.H{"url": url, "fileName": name, "size": file.Size, "type": ct, "folder": folder, "storage": "local"},
	})
}

// AdminContentUpload POST /api/admin/content/upload 管理端-内容上传（通过 API 写入内容管理，不直接操作数据库）
// 需 AdminAuth。Body: { "action": "import", "data": [ { "id","title","content","price","isFree","partId","partTitle","chapterId","chapterTitle" } ] }
func AdminContentUpload(c *gin.Context) {
	var body struct {
		Action string        `json:"action"`
		Data   []importItem  `json:"data"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "请求体无效"})
		return
	}
	if body.Action != "import" {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "action 须为 import"})
		return
	}
	if len(body.Data) == 0 {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "data 不能为空"})
		return
	}
	db := database.DB()
	imported, failed := 0, 0
	for _, item := range body.Data {
		if item.ID == "" || item.Title == "" {
			failed++
			continue
		}
		price := 1.0
		if item.Price != nil {
			price = *item.Price
		}
		isFree := false
		if item.IsFree != nil {
			isFree = *item.IsFree
		}
		wordCount := len(item.Content)
		status := "published"
		editionStandard, editionPremium := true, false
		ch := model.Chapter{
			ID:              item.ID,
			PartID:          strPtrContent(item.PartID, "part-1"),
			PartTitle:       strPtrContent(item.PartTitle, "未分类"),
			ChapterID:       strPtrContent(item.ChapterID, "chapter-1"),
			ChapterTitle:    strPtrContent(item.ChapterTitle, "未分类"),
			SectionTitle:    item.Title,
			Content:         item.Content,
			WordCount:       &wordCount,
			IsFree:          &isFree,
			Price:           &price,
			Status:          &status,
			EditionStandard: &editionStandard,
			EditionPremium:  &editionPremium,
		}
		err := db.Where("id = ?", item.ID).First(&model.Chapter{}).Error
		if err == gorm.ErrRecordNotFound {
			err = db.Create(&ch).Error
		} else if err == nil {
			err = db.Model(&model.Chapter{}).Where("id = ?", item.ID).Updates(map[string]interface{}{
				"section_title": ch.SectionTitle,
				"content":       ch.Content,
				"word_count":   ch.WordCount,
				"is_free":      ch.IsFree,
				"price":        ch.Price,
			}).Error
		}
		if err != nil {
			failed++
			continue
		}
		imported++
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "message": "导入完成", "imported": imported, "failed": failed})
}

func randomStrContent(n int) string {
	const letters = "abcdefghijklmnopqrstuvwxyz0123456789"
	b := make([]byte, n)
	for i := range b {
		b[i] = letters[rand.Intn(len(letters))]
	}
	return string(b)
}

func strPtrContent(s *string, def string) string {
	if s != nil && *s != "" {
		return *s
	}
	return def
}