<?php
/**
 * bbs/legal_learning_data.php — 법정교육 페이지 데이터
 *
 * 제공 변수:
 *   $userName        - 사용자 이름
 *   $userRank        - 직위/직급
 *   $dDay            - D-day 숫자
 *   $deadlineStr     - 마감일 문자열 (n월 j일)
 *   $chapters        - 챕터 배열 (id, code, name, lessons[])
 *   $chaptersJson    - $chapters JSON 문자열 (window.learningChapterData)
 *   $configJson      - window.learningConfigData 형식 JSON
 *   $progressRate    - 전체 진도율 (0~100 정수)
 */


require_once __DIR__ . '/db_conn.php';
require_once __DIR__ . '/api/common.php';
$pdo = db_conn();

// ── 1. 로그인 유저 ID (로그인 세션 변수 사용) ────────────────────────────
$sessionUser = api_get_session_user();
if (!$sessionUser || empty($sessionUser['member_id'])) {
    // 로그인 세션이 없으면 접근 불가 또는 리다이렉트 처리 (여기선 예시로 403)
    http_response_code(403);
    exit('로그인 세션이 필요합니다.');
}
$memberId = $sessionUser['member_id'];
$sysCompCode = $sessionUser['sys_comp_code'];

// ── 2. 유저 정보 ─────────────────────────────────────────────────────────
$stmtUser = $pdo->prepare("
    SELECT name, rank_name, sys_comp_code
    FROM   edu_users
    WHERE  member_id = ?
      AND  sys_comp_code = ?
    LIMIT  1
");
$stmtUser->execute([$memberId, $sysCompCode]);
$userRow  = $stmtUser->fetch();
$userName = $userRow['name']      ?? '사용자';
$userRank = $userRow['rank_name'] ?? '';

// ── 3. 법정교육 카테고리/챕터 고정 매핑 (관리자 코드관리 기준) ───────────────
$fixedLegalNameMap = [
    'C01' => '개인정보보호',
    'C02' => '직장내 괴롭힘 예방',
    'C03' => '장애인 인식 개선',
    'C04' => '성희롱 예방 교육',
    'C05' => '퇴직금 교육',
    // 'C06' => '산업안전보건',
];

$normalizeLegalGroupCode = static function ($value) {
    $code = strtoupper(trim((string)$value));
    if (preg_match('/^CA200(C\d{2})$/', $code, $m)) {
        return $m[1];
    }
    if (preg_match('/^C\d{2}$/', $code)) {
        return $code;
    }
    return '';
};

$legalCodes = array_keys($fixedLegalNameMap);
$legalRawCodes = [];
foreach ($legalCodes as $code) {
    $legalRawCodes[] = $code;
    $legalRawCodes[] = 'CA200' . $code;
}
$legalRawCodes = array_values(array_unique($legalRawCodes));

// 카테고리명 조회 (edu_codes 테이블)
$phCodes = implode(',', array_fill(0, count($legalRawCodes), '?'));
$stmtCodes = $pdo->prepare("
    SELECT base_code, code_name
    FROM   edu_codes
    WHERE  base_code IN ($phCodes)
    ORDER  BY base_code
");
$stmtCodes->execute($legalRawCodes);
$codeNameMap = [];
foreach ($stmtCodes->fetchAll() as $row) {
    $codeNameMap[$row['base_code']] = $row['code_name'];
}

// ── 4. 콘텐츠 + 시청 이력 조회 ───────────────────────────────────────────
$stmtContents = $pdo->prepare("
    SELECT
        c.content_id,
        c.title,
        c.content_url,
        c.description,
        c.category_group,
        c.end_date,
        c.sort_order,
        COALESCE(lh.content_tm, 0) AS content_tm,
        COALESCE(lh.watch_tm, 0)   AS watch_tm,
        COALESCE(lh.all_tm, 0)     AS all_tm,
        lh.completed_at
    FROM   edu_contents c
    LEFT JOIN edu_learning_histories lh
           ON  lh.content_id = c.content_id
           AND lh.member_id  = ?
                     AND lh.sys_comp_code = ?
    WHERE  c.is_active = 1
      AND  c.category_code = 'CA10003'
      AND  c.category_group IN ($phCodes)
    ORDER  BY c.category_group, c.sort_order ASC, c.content_id ASC
");
$stmtContents->execute(array_merge([$memberId, $sysCompCode], $legalRawCodes));
$rows = $stmtContents->fetchAll();

// ── 5. 디버그 정보 준비 ──────────────────────────────────────────────
$debugData = [
    'WHERE_category_code' => 'CA10003',
    'WHERE_category_group_IN' => $legalRawCodes,
    'rows_count' => count($rows),
    'chapter_configs' => [],
];
foreach ($legalCodes as $code) {
    $debugData['chapter_configs'][$code] = [
        'normalize_from' => [$code, 'CA200' . $code],
    ];
}

// ── 6. 챕터별 그룹화 ─────────────────────────────────────────────────────
$chapterMap = [];
foreach ($legalCodes as $idx => $code) {
    $chapterMap[$code] = [
        'id'        => $idx + 1,
        'code'      => $code,
        'name'      => $fixedLegalNameMap[$code] ?? ($codeNameMap[$code] ?? $code),
        'lessons'      => [],
        'completed'    => true,   // 아래에서 미완료 레슨 있으면 false
        'min_end_date' => null,
    ];
}

foreach ($rows as $row) {
    $code = $normalizeLegalGroupCode($row['category_group'] ?? '');
    if ($code === '' || !isset($chapterMap[$code])) { continue; }

    $contentTm = (int)$row['content_tm'];
    $watchTm   = (int)$row['watch_tm'];
    $allTm     = (int)$row['all_tm'];
    $completedAt = $row['completed_at'];
    $hasHistory = ($contentTm > 0 || $watchTm > 0 || !empty($completedAt));
    $completed = (!empty($completedAt));
    $status = !$hasHistory ? 'not-started' : ($completed ? 'completed' : 'in-progress');
    $lessonEndDate = !empty($row['end_date']) ? substr($row['end_date'], 0, 10) : null;
    $chapterMap[$code]['lessons'][] = [
        'content_id'  => $row['content_id'],
        'title'       => $row['title'],
        'url'         => $row['content_url'],
        'description' => $row['description'] ?? '',
        'content_tm'  => $contentTm,
        'watch_tm'    => $watchTm,
        'all_tm'      => $allTm,
        'completed'   => $completed,
        'status'      => $status,
        'end_date'    => $lessonEndDate,
        'sort_order'  => (int)($row['sort_order'] ?? 0),
    ];
    if ($lessonEndDate !== null) {
        if ($chapterMap[$code]['min_end_date'] === null || $lessonEndDate < $chapterMap[$code]['min_end_date']) {
            $chapterMap[$code]['min_end_date'] = $lessonEndDate;
        }
    }
    if (!$completed) {
        $chapterMap[$code]['completed'] = false;
    }
}

// 영상이 없는 챕터는 미완료 처리
foreach ($chapterMap as &$ch) {
    if (empty($ch['lessons'])) {
        $ch['completed'] = false;
    }
}
unset($ch);

$chapters = array_values($chapterMap);

// lessons를 sort_order 기준으로 재정렬 (동률 시 content_id ASC)
foreach ($chapters as &$ch) {
    usort($ch['lessons'], static function ($a, $b) {
        $diff = ($a['sort_order'] ?? 0) <=> ($b['sort_order'] ?? 0);
        return $diff !== 0 ? $diff : ($a['content_id'] <=> $b['content_id']);
    });
}
unset($ch);

// ── 6. 전체 진도율 계산 ──────────────────────────────────────────────────
$totalLessons     = 0;
$completedLessons = 0;
foreach ($chapters as $ch) {
    foreach ($ch['lessons'] as $lesson) {
        $totalLessons++;
        if ($lesson['completed']) { $completedLessons++; }
    }
}
$progressRate = $totalLessons > 0
    ? (int)round($completedLessons / $totalLessons * 100)
    : 0;

// ── 7. D-day 계산 (edu_contents.end_date 최솟값 기준, 없으면 당해 12월 31일) ──
$minEndDate = null;
foreach ($chapters as $ch) {
    if (!empty($ch['min_end_date'])) {
        if ($minEndDate === null || $ch['min_end_date'] < $minEndDate) {
            $minEndDate = $ch['min_end_date'];
        }
    }
}
$deadline    = $minEndDate
    ? new DateTime($minEndDate)
    : new DateTime(date('Y') . '-12-31');
$today       = new DateTime(date('Y-m-d'));
$diff        = $today->diff($deadline);
$dDay        = ($today <= $deadline) ? (int)$diff->days : 0;
$deadlineStr = $deadline->format('n월 j일');

// ── 8. JS 주입용 JSON 생성 ────────────────────────────────────────────────
$chaptersJson = json_encode($chapters, JSON_UNESCAPED_UNICODE);

// window.learningConfigData 형식: { chapterId: { completed, lessons:[{completed}] } }
$configData = [];
foreach ($chapters as $ch) {
    $chapterConfig = [
        'completed' => $ch['completed'],
        'lessons'   => array_map(
            fn($l) => ['completed' => $l['completed']],
            $ch['lessons']
        ),
    ];

    // 프론트 코드 호환을 위해 code/id 키 모두 제공
    $configData[$ch['code']] = $chapterConfig;
    $configData[(string)$ch['id']] = $chapterConfig;
}
$configJson = json_encode($configData, JSON_UNESCAPED_UNICODE);