<?php
declare(strict_types=1);

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

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

edu_start_session();

$memberId    = edu_current_member_id();
$sysCompCode = (string)($_SESSION['sys_comp_code'] ?? '');

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

try {
    $pdo = db_conn();
    $pdo->exec("SET NAMES 'utf8mb4'");

    // edu_user_keywords 테이블 없으면 생성 (권한 없으면 무시)
    try {
        $pdo->exec("
            CREATE TABLE IF NOT EXISTS edu_user_keywords (
                member_id     VARCHAR(20) NOT NULL,
                sys_comp_code VARCHAR(20) NOT NULL DEFAULT '',
                keyword_code  VARCHAR(20) NOT NULL,
                sort_order    INT         NOT NULL DEFAULT 0,
                PRIMARY KEY (member_id, sys_comp_code, keyword_code)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
        ");
    } catch (Throwable $__ce) { error_log('[user_keywords] CREATE: ' . $__ce->getMessage()); }

    if ($sysCompCode === '') {
        $st = $pdo->prepare('SELECT sys_comp_code FROM edu_users WHERE member_id = ? ORDER BY sys_comp_code LIMIT 1');
        $st->execute([$memberId]);
        $sysCompCode = (string)($st->fetchColumn() ?: '');
    }

    $method = $_SERVER['REQUEST_METHOD'] ?? 'GET';

    // ── POST: 사용자 키워드 저장 ──────────────────────────
    if ($method === 'POST') {
        $input  = json_decode(file_get_contents('php://input'), true) ?? [];
        $rawKws = array_slice(
            array_values(array_filter(array_map('trim', $input['keywords'] ?? []))),
            0, 3
        );

        // 한글 키워드명 → KW 코드 변환
        $nameToKw = [];
        $codeRows = $pdo->query("SELECT base_code, code_name FROM edu_codes WHERE group_code = 'KW100'")->fetchAll(PDO::FETCH_ASSOC);
        foreach ($codeRows as $cr) {
            $nameToKw[$cr['code_name']] = $cr['base_code'];
        }

    // 기존 삭제 후 재삽입
        try {
            $delStmt = $pdo->prepare('DELETE FROM edu_user_keywords WHERE member_id = ? AND sys_comp_code = ?');
            $delStmt->execute([$memberId, $sysCompCode]);
            error_log('[user_keywords] DELETE completed');
        } catch (Throwable $__de) {
            error_log('[user_keywords] DELETE failed: ' . $__de->getMessage());
        }

        $insertCnt = 0;
        try {
            $stmtIns = $pdo->prepare(
                'INSERT INTO edu_user_keywords (member_id, sys_comp_code, keyword_code) VALUES (?, ?, ?)'
            );
            foreach ($rawKws as $i => $kw) {
                $code = $nameToKw[$kw] ?? null;
                if ($code) {
                    $stmtIns->execute([$memberId, $sysCompCode, $code]);
                    $insertCnt++;
                    error_log('[user_keywords] INSERT: keyword=' . $kw . ' -> code=' . $code);
                }
            }
            error_log('[user_keywords] total INSERT: ' . $insertCnt);
        } catch (Throwable $__ie) {
            error_log('[user_keywords] INSERT failed: ' . $__ie->getMessage());
            echo json_encode(['success' => false, 'error' => 'insert_failed: ' . $__ie->getMessage()], JSON_UNESCAPED_UNICODE);
            exit;
        }

        echo json_encode(['success' => true, 'inserted' => $insertCnt], JSON_UNESCAPED_UNICODE);
        exit;
    }

    // ── GET: 사용자 키워드 조회 ── (sys_comp_code 조건 제거, member_id만으로 조회)
    $stmt = $pdo->prepare("
        SELECT uk.keyword_code, ec.code_name AS keyword_name
        FROM   edu_user_keywords uk
        JOIN   edu_codes ec ON ec.base_code = uk.keyword_code
        WHERE  uk.member_id = ?
        ORDER  BY uk.keyword_code
        LIMIT  3
    ");
    $stmt->execute([$memberId]);
    $keywords = $stmt->fetchAll(PDO::FETCH_ASSOC);

    echo json_encode(['success' => true, 'keywords' => $keywords], JSON_UNESCAPED_UNICODE);

} catch (Throwable $e) {
    error_log('[user_keywords] ' . $e->getMessage());
    echo json_encode(['success' => false, 'error' => 'server_error'], JSON_UNESCAPED_UNICODE);
}