<?php
$rootPath = dirname(dirname(dirname(__DIR__)));
require_once($rootPath . "/src/config/env.php");
require_once($rootPath . "/src/config/connection.php");
require_once($rootPath . "/src/config/functions.php");
session_start();

if (!isset($_SESSION['user_id'])) {
    die("Login required");
}

$title = $_POST['title'];
$category = $_POST['category'];
$description = $_POST['description'];
$content = $_POST['content'];
$user_id = $_SESSION['user_id'];
$date = date('Y-m-d');
$article_id = $_POST['article_id'] ?? null;
$image = null;

// Handle cover image upload if provided
if (isset($_FILES['cover_image']) && $_FILES['cover_image']['error'] === UPLOAD_ERR_OK) {
    // For new blogs, we'll use the blog_id after insert, for now use temp folder
    // Update: For editing, use article_id; for new blogs, we'll need to handle this after insert
    $folder_id = $article_id ?? 'temp_' . uniqid();
    $upload_dir = $rootPath . '/uploads/blogs/' . $folder_id . '/';
    
    // Create directory if it doesn't exist
    if (!file_exists($upload_dir)) {
        mkdir($upload_dir, 0777, true);
    }
    
    // Validate and process the file
    $file_result = validateFileUpload($_FILES['cover_image'], 'profile_picture');
    if ($file_result !== false) {
        // Use fixed filename "cover" to avoid duplicates
        $extension = $file_result['extension'];
        $filename = "cover." . $extension;
        
        // Delete old cover if it exists with different extension
        array_map('unlink', glob($upload_dir . "cover.*"));
        
        $upload_path = $upload_dir . $filename;
        
        if (move_uploaded_file($_FILES['cover_image']['tmp_name'], $upload_path)) {
            // Store relative path for database
            $image = '/uploads/blogs/' . $folder_id . '/' . $filename;
        }
    }
}

// If updating an existing blog, get the existing image if no new one was uploaded
if ($article_id && !$image) {
    $check_stmt = $conn->prepare("SELECT image FROM blogs WHERE blog_id = ?");
    $check_stmt->bind_param("i", $article_id);
    $check_stmt->execute();
    $result = $check_stmt->get_result();
    if ($result->num_rows > 0) {
        $row = $result->fetch_assoc();
        $image = $row['image'];
    }
    $check_stmt->close();
}

// Check if this is an update or insert
if ($article_id) {
    // Update existing blog
    $stmt = $conn->prepare("UPDATE blogs SET title = ?, content = ?, description = ?, category = ?" . ($image ? ", image = ?" : "") . " WHERE blog_id = ?");
    if ($image) {
        $stmt->bind_param("sssssi", $title, $content, $description, $category, $image, $article_id);
    } else {
        $stmt->bind_param("ssssi", $title, $content, $description, $category, $article_id);
    }
} else {
    // Insert new blog
    $stmt = $conn->prepare("INSERT INTO blogs (author, title, content, description, category, date, image) VALUES (?, ?, ?, ?, ?, ?, ?)");
    $stmt->bind_param("issssss", $user_id, $title, $content, $description, $category, $date, $image);
}

$stmt->execute();
$stmt->close();

header("Location: blog.php");