<?php
declare(strict_types=1);

header('Content-Type: application/json; charset=utf-8');

require_once dirname(__DIR__) . '/db_conn.php';

if (session_status() !== PHP_SESSION_ACTIVE) {
	session_start();
}

$memberId = (string)($_SESSION['member_id'] ?? '');

if ($memberId === '') {
	http_response_code(401);
	echo json_encode(['success' => false, 'message' => 'not_logged_in'], JSON_UNESCAPED_UNICODE);
	exit;
}

$contentId = trim((string)($_GET['content_id'] ?? ''));
if ($contentId === '') {
	http_response_code(400);
	echo json_encode(['success' => false, 'message' => 'content_id_required'], JSON_UNESCAPED_UNICODE);
	exit;
}

try {
	$pdo = db_conn();

	$stmtCategory = $pdo->prepare('SELECT category_code FROM edu_contents WHERE content_id = ? LIMIT 1');
	$stmtCategory->execute([$contentId]);
	$categoryCode = strtoupper((string)($stmtCategory->fetchColumn() ?: ''));

	// ── 마이클래스(CA10001): edu_learning_histories.comment 에서 본인 소감 조회 ──
	if ($categoryCode === 'CA10001') {
		$sqlLh = 'SELECT lh.member_id, COALESCE(u.name, lh.member_id) AS member_name,
				         lh.comment, lh.last_viewed_at
				  FROM edu_learning_histories lh
				  LEFT JOIN edu_users u ON u.member_id = lh.member_id AND u.sys_comp_code = lh.sys_comp_code
				  WHERE lh.content_id = ? AND lh.member_id = ?';
		$paramsLh = [$contentId, $memberId];

		$sysCompCode = (string)($_SESSION['sys_comp_code'] ?? '');
		if ($sysCompCode !== '') {
			$sqlLh .= ' AND lh.sys_comp_code = ?';
			$paramsLh[] = $sysCompCode;
		}

		$sqlLh .= ' ORDER BY lh.last_viewed_at DESC LIMIT 1';
		$stmtLh = $pdo->prepare($sqlLh);
		$stmtLh->execute($paramsLh);
		$row = $stmtLh->fetch(PDO::FETCH_ASSOC);

		$data = [];
		if ($row && $row['comment'] !== null && trim((string)$row['comment']) !== '') {
			$authorId = (string)($row['member_id'] ?? '');
			$profileFilePath = __DIR__ . '/../../img/profile/' . $authorId . '_' . $sysCompCode . '.png';
			$profileImageUrl = file_exists($profileFilePath)
				? '/img/profile/' . $authorId . '_' . $sysCompCode . '.png'
				: '/img/ico/ico_user.svg';
			$data[] = [
				'id'            => $contentId,
				'member_id'     => $authorId,
				'member_name'   => (string)($row['member_name'] ?? $authorId),
				'comment'       => (string)$row['comment'],
				'created_at'    => (string)($row['last_viewed_at'] ?? ''),
				'updated_at'    => (string)($row['last_viewed_at'] ?? ''),
				'is_author'     => true,
				'profile_image' => $profileImageUrl,
			];
		}

		echo json_encode([
			'success'  => true,
			'category' => $categoryCode,
			'data'     => $data,
		], JSON_UNESCAPED_UNICODE);
		exit;
	}

	// ── 기타 카테고리: 기존 edu_comments 테이블 조회 ──
	$sysCompCode = (string)($_SESSION['sys_comp_code'] ?? '');
	$params = [$contentId];
	$sql = 'SELECT c.id, c.member_id, c.sys_comp_code, COALESCE(u.name, c.member_id) AS member_name, c.comment, c.created_at, c.updated_at
			FROM edu_comments c
			LEFT JOIN edu_users u ON u.member_id = c.member_id AND u.sys_comp_code = c.sys_comp_code
			WHERE c.content_id = ?';

	$sql .= ' ORDER BY c.id DESC';

	$stmt = $pdo->prepare($sql);
	$stmt->execute($params);
	$rows = $stmt->fetchAll(PDO::FETCH_ASSOC) ?: [];

	$data = array_map(static function (array $row) use ($memberId, $sysCompCode): array {
		$authorId = (string)($row['member_id'] ?? '');
		$rowSysCompCode = (string)($row['sys_comp_code'] ?? '');
		$profileFilePath = __DIR__ . '/../../img/profile/' . $authorId . '_' . $rowSysCompCode . '.png';
		$profileImageUrl = file_exists($profileFilePath)
			? '/img/profile/' . $authorId . '_' . $rowSysCompCode . '.png'
			: '/img/ico/ico_user.svg';
		return [
			'id'            => (int)($row['id'] ?? 0),
			'member_id'     => $authorId,
			'member_name'   => (string)($row['member_name'] ?? $authorId),
			'comment'       => (string)($row['comment'] ?? ''),
			'created_at'    => (string)($row['created_at'] ?? ''),
			'updated_at'    => (string)($row['updated_at'] ?? ''),
			'is_author'     => ($authorId === $memberId && $rowSysCompCode === $sysCompCode),
			'profile_image' => $profileImageUrl,
		];
	}, $rows);

	echo json_encode([
		'success' => true,
		'category' => $categoryCode,
		'data' => $data,
	], JSON_UNESCAPED_UNICODE);
} catch (Throwable $e) {
	error_log('[get_comments] ' . $e->getMessage());
	http_response_code(500);
	echo json_encode(['success' => false, 'message' => 'server_error'], JSON_UNESCAPED_UNICODE);
}