<?php
session_start();
header('Content-Type: application/json');

if (empty($_SESSION['login'])) {
    echo json_encode(['status'=>'error','message'=>'로그인 필요']);
    exit;
}

require_once __DIR__.'/db_conn.php';

$postId  = (int)($_POST['postId'] ?? 0);
$content = trim($_POST['comment'] ?? '');

if ($postId < 1 || ($content === '' && empty($_FILES['images']))) {
    echo json_encode(['status'=>'error','message'=>'내용 없음']);
    exit;
}

$user = $_SESSION['login'];

try {
    $pdo->beginTransaction();

    /* =========================
       1) 댓글 INSERT
    ========================= */
    $stmt = $pdo->prepare("
        INSERT INTO kngil.qa_comments
            (post_id, commenter, user_nm, content, cdt_dt)
        VALUES
            (:post_id, :commenter, :user_nm, :content, NOW())
        RETURNING comment_id
    ");
    $stmt->execute([
        ':post_id'   => $postId,
        ':commenter' => $user['user_id'],
        ':user_nm'   => $user['user_nm'],
        ':content'   => $content
    ]);

    $commentId = $stmt->fetchColumn();

    /* =========================
       2) 이미지 업로드
    ========================= */
    $images = [];

    if (!empty($_FILES['images']['name'][0])) {

        $uploadDir = $_SERVER['DOCUMENT_ROOT'].'/kngil/uploads/comment/';
        if (!is_dir($uploadDir)) {
            mkdir($uploadDir, 0777, true);
        }

        foreach ($_FILES['images']['name'] as $i => $name) {

            if ($_FILES['images']['error'][$i] !== UPLOAD_ERR_OK) continue;

            $tmp  = $_FILES['images']['tmp_name'][$i];
            $size = $_FILES['images']['size'][$i];
            $ext  = strtolower(pathinfo($name, PATHINFO_EXTENSION));

            $save = time().'_'.bin2hex(random_bytes(4)).'.'.$ext;
            $fullPath = $uploadDir.$save;
            move_uploaded_file($tmp, $fullPath);

            $path = '/kngil/uploads/comment/'.$save;

            // 🔥 DB 구조에 맞게 INSERT
            $pdo->prepare("
                INSERT INTO kngil.qa_comment_images
                    (comment_id, file_name, file_path, thumb_path, file_size, uploaded_at)
                VALUES
                    (:comment_id, :file_name, :file_path, :thumb_path, :file_size, NOW())
            ")->execute([
                ':comment_id' => $commentId,
                ':file_name'  => $name,
                ':file_path'  => $path,
                ':thumb_path' => $path, // 지금은 동일 (추후 썸네일 분리 가능)
                ':file_size'  => $size
            ]);

            $images[] = [
                'thumb' => $path,
                'full'  => $path,
                'name'  => $name
            ];
        }
    }

    $pdo->commit();

    echo json_encode([
        'status'        => 'ok',
        'comment_id'    => $commentId,
        'comment_text'  => $content,
        'user_name'     => $user['user_nm'],
        'login_id'      => $user['user_id'],
        'created_at'    => date('Y-m-d H:i'),
        'images'        => $images
    ]);

} catch (Exception $e) {
    $pdo->rollBack();
    echo json_encode([
        'status'  => 'error',
        'message' => $e->getMessage()
    ]);
}