<?php
/**
 * Q&A 리스트 컨트롤러
 * - 스킨: /kngil/skin/qa_list.skin.php
 */

ini_set('display_errors', 1);
error_reporting(E_ALL);

if (session_status() === PHP_SESSION_NONE) {
    session_start();
}

require_once $_SERVER['DOCUMENT_ROOT'].'/kngil/bbs/db_conn.php';

/* =========================
   1. 입력값 정리
========================= */
$page      = max(1, (int)($_GET['page'] ?? 1));
$pageSize  = 10;
$offset    = ($page - 1) * $pageSize;

$search = trim($_GET['q'] ?? '');
$cats   = $_GET['cat'] ?? [];        // 배열
$writer = $_GET['writer'] ?? '';     // me
$status = $_GET['status'] ?? 'all';  // 상태

$isLogin = !empty($_SESSION['login']);
$loginUserId = $_SESSION['login']['user_id'] ?? null;

/* =========================
   2. WHERE 조건 구성
========================= */
$where  = [];
$params = [];

/* 카테고리 */
if (!empty($cats) && !in_array('all', $cats, true)) {
    $catKeys = [];
    foreach ($cats as $i => $cat) {
        $key = ":cat{$i}";
        $catKeys[] = $key;
        $params[$key] = $cat;
    }
    $where[] = "p.category IN (" . implode(',', $catKeys) . ")";
}

/* 내가 작성한 글 */
if ($writer === 'me' && $loginUserId) {
    $where[] = "p.user_id = :me";
    $params[':me'] = $loginUserId;
}

/* 상태 */
if ($status !== 'all') {
    $where[] = "p.stat_bc = :status";
    $params[':status'] = $status;
}

/* 검색 (제목 + 내용) */
if ($search !== '') {
    $where[] = "(p.title ILIKE :q OR p.content ILIKE :q)";
    $params[':q'] = "%{$search}%";
}

$whereSql = $where ? 'WHERE ' . implode(' AND ', $where) : '';

/* =========================
   3. 전체 건수
========================= */
$countSql = "
    SELECT COUNT(*)
    FROM kngil.qa_posts p
    {$whereSql}
";
$stmt = $pdo->prepare($countSql);
$stmt->execute($params);
$totalCount = (int)$stmt->fetchColumn();

/* =========================
   4. 리스트 조회
========================= */
$listSql = "
    SELECT
    p.post_id,
    p.category,
    p.title,
    p.user_nm,
    p.co_nm,
    p.dept_nm,
    p.stat_bc AS status,
    p.is_secret,
    p.cdt_dt AS created_at,

    -- 댓글 수
    (
        SELECT COUNT(*)
        FROM kngil.qa_comments c
        WHERE c.post_id = p.post_id
    ) AS comment_count,

    -- 첨부파일 수
    (
        SELECT COUNT(*)
        FROM kngil.qa_attachments a
        WHERE a.post_id = p.post_id
    ) AS file_count

    FROM kngil.qa_posts p
    {$whereSql}
    ORDER BY
        (p.category = 'notice') DESC,
        p.post_id DESC
    LIMIT :limit OFFSET :offset
";

$stmt = $pdo->prepare($listSql);

/* 바인딩 */
foreach ($params as $k => $v) {
    $stmt->bindValue($k, $v);
}
$stmt->bindValue(':limit',  $pageSize, PDO::PARAM_INT);
$stmt->bindValue(':offset', $offset,   PDO::PARAM_INT);

$stmt->execute();
$posts = $stmt->fetchAll(PDO::FETCH_ASSOC);

/* =========================
   5. 표시용 가공
========================= */
foreach ($posts as &$row) {
    // 회사 표시
    $row['display_company'] = $row['co_nm'] ?? '';

    // 작성자 표시
    $row['display_name'] = $row['user_nm'] ?? $row['user_id'];

    // 날짜 포맷
    $row['created_at'] = substr($row['created_at'], 0, 10);
}
unset($row);

/* =========================
   6. 페이징 계산
========================= */
$totalPages = (int)ceil($totalCount / $pageSize);

/* =========================
   7. 스킨 렌더링
========================= */
include $_SERVER['DOCUMENT_ROOT'].'/kngil/skin/qa_list.skin.php';