// Updated admin_post.go with better image handling

package handlers

import (
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"github.com/patel-mann/poll-system/app/internal/models"
	"github.com/patel-mann/poll-system/app/internal/utils"
)

func PostsHandler(w http.ResponseWriter, r *http.Request) {
	userID := r.Context().Value("user_id").(int)
	role := r.Context().Value("user_role").(int)

	if r.Method == http.MethodPost {
		// Parse multipart form
		err := r.ParseMultipartForm(10 << 20) // 10MB max
		if err != nil {
			fmt.Printf("Error parsing form: %v\n", err)
			http.Error(w, "Invalid form", http.StatusBadRequest)
			return
		}

		content := r.FormValue("content")
		if strings.TrimSpace(content) == "" {
			http.Error(w, "Content cannot be empty", http.StatusBadRequest)
			return
		}

		var imagePath string
		file, handler, err := r.FormFile("image")
		if err == nil && file != nil {
			defer file.Close()

			// Validate file type
			allowedTypes := map[string]bool{
				".jpg":  true,
				".jpeg": true,
				".png":  true,
				".gif":  true,
				".webp": true,
			}

			ext := strings.ToLower(filepath.Ext(handler.Filename))
			if !allowedTypes[ext] {
				http.Error(w, "Invalid file type. Only images allowed.", http.StatusBadRequest)
				return
			}

			// Ensure uploads folder exists
			uploadDir := "uploads"
			if err := os.MkdirAll(uploadDir, 0755); err != nil {
				fmt.Printf("Error creating upload directory: %v\n", err)
				http.Error(w, "Unable to create upload directory", http.StatusInternalServerError)
				return
			}

			// Create unique filename
			filename := fmt.Sprintf("%d_%d%s", userID, time.Now().UnixNano(), ext)
			savePath := filepath.Join(uploadDir, filename)

			out, err := os.Create(savePath)
			if err != nil {
				fmt.Printf("Error creating file: %v\n", err)
				http.Error(w, "Unable to save file", http.StatusInternalServerError)
				return
			}
			defer out.Close()

			_, err = io.Copy(out, file)
			if err != nil {
				fmt.Printf("Error copying file: %v\n", err)
				http.Error(w, "Failed to save file", http.StatusInternalServerError)
				return
			}

			// Save path relative to the static route
			imagePath = "/uploads/" + filename
			fmt.Printf("Image saved at: %s\n", imagePath)
		} else if err != http.ErrMissingFile {
			fmt.Printf("Error getting file: %v\n", err)
		}

		// Insert post
		_, err = models.DB.Exec(`INSERT INTO post (author_id, content, image_url) VALUES ($1, $2, $3)`,
			userID, content, imagePath)
		if err != nil {
			fmt.Printf("Database error: %v\n", err)
			http.Error(w, "Failed to create post", http.StatusInternalServerError)
			return
		}

		fmt.Printf("Post created successfully with image: %s\n", imagePath)
		http.Redirect(w, r, "/posts", http.StatusSeeOther)
		return
	}

	// GET request: fetch posts
	rows, err := models.DB.Query(`
		SELECT p.post_id, p.author_id, u.first_name || ' ' || u.last_name AS author_name,
		       p.content, COALESCE(p.image_url, '') as image_url, p.created_at
		FROM post p
		JOIN users u ON p.author_id = u.user_id
		ORDER BY p.created_at DESC
	`)
	if err != nil {
		fmt.Printf("Database query error: %v\n", err)
		http.Error(w, "Failed to fetch posts", http.StatusInternalServerError)
		return
	}
	defer rows.Close()

	var posts []models.Post
	for rows.Next() {
		var p models.Post
		err := rows.Scan(&p.PostID, &p.AuthorID, &p.AuthorName, &p.Content, &p.ImageURL, &p.CreatedAt)
		if err != nil {
			fmt.Printf("Row scan error: %v\n", err)
			continue
		}
		posts = append(posts, p)
	}

	// Add cache busting parameter to image URLs
	for i := range posts {
		if posts[i].ImageURL != "" {
			posts[i].ImageURL += "?t=" + strconv.FormatInt(time.Now().UnixNano(), 10)
			fmt.Printf("Post %d image URL: %s\n", posts[i].PostID, posts[i].ImageURL)
		}
	}

	// Get navigation flags
	showAdminNav, showVolunteerNav := getNavFlags(role)

	fmt.Printf("Rendering %d posts\n", len(posts))
	
	utils.Render(w, "posts.html", map[string]interface{}{
		"Title":             "Posts",
		"IsAuthenticated":   true,
		"ShowAdminNav":      showAdminNav,
		"ShowVolunteerNav":  showVolunteerNav,
		"Posts":             posts,
		"ActiveSection":     "posts",
	})
}

// Helper function (add this to your main.go if not already there)
func getNavFlags(role int) (bool, bool) {
	showAdminNav := role == 1     // Admin role
	showVolunteerNav := role == 3 // Volunteer role
	return showAdminNav, showVolunteerNav
}