/* ===== 알림 수신자 관리 ===== */
let nrLoaded = false;
let nrData = {};       // { type: { label, recipients: [...] } }
let nrTypes = {};      // { type: label }
let nrCategories = {}; // { category: { label, icon, types: [...] } }
let nrAllUsers = [];   // 사용자 목록 (수신자 추가용)

async function loadNotificationRecipientsTab() {
    if (nrLoaded) return;
    try {
        const [typesRes, allRes, usersRes] = await Promise.all([
            api('/notification-recipients/types'),
            api('/notification-recipients'),
            api('/users?status=active')
        ]);
        nrTypes = typesRes.data?.types || typesRes.data || {};
        nrCategories = typesRes.data?.categories || {};
        nrData = allRes.data || {};
        nrAllUsers = (usersRes.data || usersRes || []).filter(u => u.status !== 'inactive');
        nrLoaded = true;
        renderNrTab();
    } catch (e) {
        document.getElementById('nrContent').innerHTML =
            `<p class="text-red-500 text-center py-8">데이터 로드 실패: ${escapeHtml(e.message)}</p>`;
    }
}

function renderNrTab() {
    const container = document.getElementById('nrContent');
    if (!Object.keys(nrTypes).length) {
        container.innerHTML = '<p class="text-gray-400 text-center py-8">등록된 알림 유형이 없습니다.</p>';
        return;
    }

    let html = '';
    const categoryKeys = Object.keys(nrCategories);

    if (categoryKeys.length > 0) {
        // 카테고리별 그룹 렌더링
        for (const [catKey, cat] of Object.entries(nrCategories)) {
            html += `
            <div class="mb-6">
                <h2 class="text-base font-bold text-gray-700 mb-3 flex items-center gap-2">
                    <i class="fas ${cat.icon} text-slate-500"></i>${escapeHtml(cat.label)}
                </h2>
                <div class="pl-4 space-y-3">`;

            for (const type of cat.types) {
                const label = nrTypes[type];
                if (!label) continue;
                const recipients = nrData[type]?.recipients || [];
                html += renderNrTypeCard(type, label, recipients);
            }

            html += `
                </div>
            </div>`;
        }
    } else {
        // 폴백: 카테고리 없이 flat 리스트
        for (const [type, label] of Object.entries(nrTypes)) {
            const recipients = nrData[type]?.recipients || [];
            html += renderNrTypeCard(type, label, recipients);
        }
    }

    container.innerHTML = html;
}

function renderNrTypeCard(type, label, recipients) {
    return `
    <div class="bg-white rounded-xl shadow-sm p-5 mb-3">
        <div class="flex items-center justify-between mb-3">
            <h3 class="text-sm font-semibold text-gray-800">
                <i class="fas ${nrTypeIcon(type)} text-slate-500 mr-2"></i>${escapeHtml(label)}
                <span class="ml-2 text-xs font-normal text-gray-400">${recipients.length}명</span>
            </h3>
            <button onclick="openNrAddModal('${type}')" class="px-3 py-1 bg-slate-700 text-white rounded-lg text-xs hover:bg-slate-800">
                <i class="fas fa-plus mr-1"></i>추가
            </button>
        </div>
        <div class="flex flex-wrap gap-2" id="nrList-${type}">
            ${recipients.length === 0
                ? '<span class="text-gray-400 text-sm">수신자 없음</span>'
                : recipients.map(r => `
                    <span class="inline-flex items-center gap-1.5 px-3 py-1.5 bg-gray-100 rounded-full text-sm">
                        <span class="w-6 h-6 bg-slate-600 text-white rounded-full flex items-center justify-center text-xs font-bold">${escapeHtml((r.user_name || r.username || '?')[0])}</span>
                        ${escapeHtml(r.user_name || r.username)}
                        <button onclick="removeNrRecipient('${type}', ${r.user_id})" class="text-gray-400 hover:text-red-500 ml-1" title="제거">
                            <i class="fas fa-times text-xs"></i>
                        </button>
                    </span>
                `).join('')
            }
        </div>
    </div>`;
}

function nrTypeIcon(type) {
    const icons = {
        repair: 'fa-wrench',
        safety: 'fa-shield-alt',
        nonconformity: 'fa-exclamation-triangle',
        partner_work: 'fa-hard-hat',
        day_labor: 'fa-user-clock',
        system: 'fa-server'
    };
    return icons[type] || 'fa-bell';
}

/* ===== 수신자 추가 모달 ===== */
let nrAddType = '';

function openNrAddModal(type) {
    nrAddType = type;
    const label = nrTypes[type] || type;
    document.getElementById('nrAddModalTitle').textContent = `${label} 수신자 추가`;

    const currentIds = (nrData[type]?.recipients || []).map(r => r.user_id);
    const available = nrAllUsers.filter(u => !currentIds.includes(u.user_id));

    const listEl = document.getElementById('nrAddUserList');
    if (available.length === 0) {
        listEl.innerHTML = '<p class="text-gray-400 text-sm text-center py-4">추가 가능한 사용자가 없습니다.</p>';
    } else {
        listEl.innerHTML = available.map(u => `
            <label class="flex items-center gap-2 px-3 py-2 rounded-lg hover:bg-gray-50 cursor-pointer">
                <input type="checkbox" value="${u.user_id}" class="nrAddCheck rounded">
                <span class="text-sm">${escapeHtml(u.name || u.username)}</span>
                <span class="text-xs text-gray-400">${escapeHtml(u.username)}</span>
            </label>
        `).join('');
    }

    document.getElementById('nrAddModal').classList.remove('hidden');
}

function closeNrAddModal() {
    document.getElementById('nrAddModal').classList.add('hidden');
}

async function submitNrAdd() {
    const checked = [...document.querySelectorAll('.nrAddCheck:checked')].map(c => Number(c.value));
    if (checked.length === 0) { showToast('사용자를 선택해주세요.', 'error'); return; }

    try {
        for (const userId of checked) {
            await api('/notification-recipients', {
                method: 'POST',
                body: JSON.stringify({ notification_type: nrAddType, user_id: userId })
            });
        }
        showToast(`${checked.length}명 수신자 추가 완료`);
        closeNrAddModal();
        nrLoaded = false;
        await loadNotificationRecipientsTab();
    } catch (e) {
        showToast('수신자 추가 실패: ' + e.message, 'error');
    }
}

async function removeNrRecipient(type, userId) {
    if (!confirm('이 수신자를 제거하시겠습니까?')) return;
    try {
        await api(`/notification-recipients/${type}/${userId}`, { method: 'DELETE' });
        showToast('수신자 제거 완료');
        nrLoaded = false;
        await loadNotificationRecipientsTab();
    } catch (e) {
        showToast('수신자 제거 실패: ' + e.message, 'error');
    }
}