package controllers

import (
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"lv8girl/internal/middleware"
	"lv8girl/internal/services"
)

type DiscussionController struct {
	discussionSvc *services.DiscussionService
}

func NewDiscussionController() *DiscussionController {
	return &DiscussionController{
		discussionSvc: services.NewDiscussionService(),
	}
}

func (c *DiscussionController) ShowNewPost(ctx *gin.Context) {
	userID, username, userRole, _ := middleware.GetCurrentUser(ctx)
	ctx.HTML(http.StatusOK, "post_discussion.html", gin.H{
		"IsLoggedIn": true,
		"UserID":     userID,
		"Username":   username,
		"UserRole":   userRole,
		"Error":      "",
		"Success":    "",
	})
}

func (c *DiscussionController) CreatePost(ctx *gin.Context) {
	userID, username, userRole, _ := middleware.GetCurrentUser(ctx)

	title := strings.TrimSpace(ctx.PostForm("title"))
	content := strings.TrimSpace(ctx.PostForm("content"))

	if title == "" || content == "" {
		ctx.HTML(http.StatusOK, "post_discussion.html", gin.H{
			"IsLoggedIn": true,
			"UserID":     userID,
			"Username":   username,
			"UserRole":   userRole,
			"Error":      "标题和内容不能为空",
			"Success":    "",
		})
		return
	}

	var imagePath string
	file, err := ctx.FormFile("image")
	if err == nil {
		if file.Size > 2*1024*1024 {
			ctx.HTML(http.StatusOK, "post_discussion.html", gin.H{
				"IsLoggedIn": true,
				"UserID":     userID,
				"Username":   username,
				"UserRole":   userRole,
				"Error":      "图片大小不能超过2MB",
				"Success":    "",
			})
			return
		}

		ext := strings.ToLower(filepath.Ext(file.Filename))
		filename := "post_" + time.Now().Format("20060102150405") + "_" + randomString(8) + ext
		uploadDir := "uploads/posts"

		if _, err := os.Stat(uploadDir); os.IsNotExist(err) {
			os.MkdirAll(uploadDir, 0755)
		}

		imagePath = filepath.Join(uploadDir, filename)
		if err := ctx.SaveUploadedFile(file, imagePath); err != nil {
			ctx.HTML(http.StatusOK, "post_discussion.html", gin.H{
				"IsLoggedIn": true,
				"UserID":     userID,
				"Username":   username,
				"UserRole":   userRole,
				"Error":      "图片保存失败",
				"Success":    "",
			})
			return
		}
	}

	if err := c.discussionSvc.CreatePost(userID, title, content, imagePath); err != nil {
		ctx.HTML(http.StatusOK, "post_discussion.html", gin.H{
			"IsLoggedIn": true,
			"UserID":     userID,
			"Username":   username,
			"UserRole":   userRole,
			"Error":      "发帖失败，请稍后重试",
			"Success":    "",
		})
		return
	}

	ctx.HTML(http.StatusOK, "post_discussion.html", gin.H{
		"IsLoggedIn": true,
		"UserID":     userID,
		"Username":   username,
		"UserRole":   userRole,
		"Error":      "",
		"Success":    "帖子已提交，等待管理员审核。",
	})
}

func randomString(n int) string {
	const letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
	b := make([]byte, n)
	for i := range b {
		b[i] = letters[time.Now().UnixNano()%int64(len(letters))]
	}
	return string(b)
}