package handler

import (
	"fmt"
	"image"
	_ "image/jpeg"
	_ "image/png"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"strings"

	"github.com/disintegration/imaging"
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"gorm.io/gorm"

	"github.com/wangjia/jiu/backend/config"
	"github.com/wangjia/jiu/backend/internal/middleware"
	"github.com/wangjia/jiu/backend/internal/model"
)

type FeedbackHandler struct{ db *gorm.DB }

func NewFeedbackHandler(db *gorm.DB) *FeedbackHandler {
	return &FeedbackHandler{db: db}
}

type submitFeedbackRequest struct {
	Type       string   `json:"type" binding:"required,oneof=bug suggestion"`
	Content    string   `json:"content"`
	Images     []string `json:"images"`
	AppVersion string   `json:"app_version"`
	Platform   string   `json:"platform"`
}

// Submit POST /api/v1/feedback （需登录）
func (h *FeedbackHandler) Submit(c *gin.Context) {
	shopID := middleware.GetShopID(c)
	userID := middleware.GetUserID(c)
	role := c.GetString(middleware.CtxRole)

	var req submitFeedbackRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if strings.TrimSpace(req.Content) == "" && len(req.Images) == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "请填写反馈内容或添加图片"})
		return
	}
	if len(req.Images) > 9 {
		req.Images = req.Images[:9]
	}

	// 去规范化：从 JWT 身份补全 username / shop_code，便于后台查看
	var username string
	var u model.User
	if err := h.db.Select("username").First(&u, userID).Error; err == nil {
		username = u.Username
	}
	var shopCode string
	var shop model.Shop
	if err := h.db.Select("code").First(&shop, shopID).Error; err == nil {
		shopCode = shop.Code
	}

	fb := model.Feedback{
		ShopID:     shopID,
		ShopCode:   shopCode,
		UserID:     userID,
		Username:   username,
		Role:       role,
		Type:       req.Type,
		Content:    strings.TrimSpace(req.Content),
		Images:     req.Images,
		AppVersion: req.AppVersion,
		Platform:   req.Platform,
		ClientIP:   c.ClientIP(),
		Status:     "new",
	}
	if err := h.db.Create(&fb).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "submit failed"})
		return
	}
	c.JSON(http.StatusCreated, gin.H{"id": fb.ID})
}

// UploadImage POST /api/v1/feedback/images （需登录）
func (h *FeedbackHandler) UploadImage(c *gin.Context) {
	shopID := middleware.GetShopID(c)

	// 限制 5MB
	if err := c.Request.ParseMultipartForm(5 << 20); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "文件超过 5MB 限制"})
		return
	}
	file, _, err := c.Request.FormFile("file")
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "请上传文件（field: file）"})
		return
	}
	defer file.Close()

	img, _, err := image.Decode(file)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "仅支持 JPEG/PNG 图片"})
		return
	}
	resized := imaging.Fit(img, 1600, 1600, imaging.Lanczos)

	filename := uuid.New().String() + ".jpg"
	subdir := fmt.Sprintf("%s/feedback/%d", config.C.Storage.UploadDir, shopID)
	if err := os.MkdirAll(subdir, 0755); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "存储目录创建失败"})
		return
	}
	fullPath := filepath.Join(subdir, filename)
	if err := imaging.Save(resized, fullPath, imaging.JPEGQuality(85)); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "图片保存失败"})
		return
	}

	relURL := fmt.Sprintf("/images/feedback/%d/%s", shopID, filename)
	c.JSON(http.StatusCreated, gin.H{"url": relURL})
}

// List GET /api/v1/admin/feedback （仅超级管理员）
func (h *FeedbackHandler) List(c *gin.Context) {
	var q struct {
		Type     string `form:"type"`
		Status   string `form:"status"`
		ShopID   uint64 `form:"shop_id"`
		Page     int    `form:"page,default=1"`
		PageSize int    `form:"page_size,default=50"`
	}
	if err := c.ShouldBindQuery(&q); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if q.PageSize <= 0 || q.PageSize > 200 {
		q.PageSize = 50
	}
	if q.Page <= 0 {
		q.Page = 1
	}

	db := h.db.Model(&model.Feedback{})
	if q.Type != "" {
		db = db.Where("type = ?", q.Type)
	}
	if q.Status != "" {
		db = db.Where("status = ?", q.Status)
	}
	if q.ShopID != 0 {
		db = db.Where("shop_id = ?", q.ShopID)
	}

	var total int64
	db.Count(&total)

	var list []model.Feedback
	db.Order("id DESC").Offset((q.Page - 1) * q.PageSize).Limit(q.PageSize).Find(&list)

	c.JSON(http.StatusOK, gin.H{
		"data":      list,
		"total":     total,
		"page":      q.Page,
		"page_size": q.PageSize,
	})
}

// UpdateStatus PATCH /api/v1/admin/feedback/:id （仅超级管理员）
func (h *FeedbackHandler) UpdateStatus(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}
	var req struct {
		Status string `json:"status" binding:"required,oneof=new handled"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	res := h.db.Model(&model.Feedback{}).Where("id = ?", id).Update("status", req.Status)
	if res.Error != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": res.Error.Error()})
		return
	}
	if res.RowsAffected == 0 {
		c.JSON(http.StatusNotFound, gin.H{"error": "not found"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "updated"})
}