const apiFetch = async (url, options = {}) => {
  const opts = {
    headers: { 'Content-Type': 'application/json' },
    ...options,
  };
  if (opts.body && typeof opts.body !== 'string') {
    opts.body = JSON.stringify(opts.body);
  }
  const res = await fetch(url, opts);
  if (!res.ok) {
    throw new Error(`API error: ${res.status}`);
  }
  return res.json();
};

const showToast = (message, type = 'success') => {
  const container = document.querySelector('.toast-container');
  if (!container) return;
  const toast = document.createElement('div');
  toast.className = `toast align-items-center text-bg-${type} border-0 show`;
  toast.setAttribute('role', 'alert');
  toast.innerHTML = `
    <div class="d-flex">
      <div class="toast-body">${message}</div>
      <button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast"></button>
    </div>`;
  container.appendChild(toast);
  setTimeout(() => toast.remove(), 3200);
};

const initAdmin = () => {
    const navLinks = document.querySelectorAll('[data-section-link]');
    const sections = document.querySelectorAll('[data-section]');

    navLinks.forEach(link => {
        link.addEventListener('click', (e) => {
            e.preventDefault();
            const target = link.dataset.sectionLink;
            navLinks.forEach(l => l.classList.remove('active'));
            link.classList.add('active');
            sections.forEach(s => s.classList.add('d-none'));
            document.querySelector(`[data-section="${target}"]`).classList.remove('d-none');
            
            if (target === 'dashboard') loadDashboard();
            if (target === 'contacts') loadAdminContacts();
            if (target === 'messages') loadAdminMessages();
            if (target === 'auto') loadAutoReplies();
            if (target === 'settings') loadSettings();
        });
    });

    // Forms
    document.querySelector('[data-send-form]')?.addEventListener('submit', async (e) => {
        e.preventDefault();
        const data = Object.fromEntries(new FormData(e.target));
        try {
            await apiFetch('/api/messages.php', { method: 'POST', body: { contact_phone: data.phone, body: data.body, direction: 'out' } });
            showToast('发送成功');
            e.target.reset();
        } catch (e) { showToast('发送失败', 'danger'); }
    });

    document.querySelector('[data-reply-form]')?.addEventListener('submit', async (e) => {
        e.preventDefault();
        const data = Object.fromEntries(new FormData(e.target));
        try {
            await apiFetch('/api/auto_reply.php', { method: 'POST', body: data });
            showToast('已添加规则');
            e.target.reset();
            loadAutoReplies();
        } catch (e) { showToast('添加失败', 'danger'); }
    });

    document.querySelector('[data-settings-form]')?.addEventListener('submit', async (e) => {
        e.preventDefault();
        const data = Object.fromEntries(new FormData(e.target));
        try {
            await apiFetch('/api/settings.php', { method: 'POST', body: data });
            showToast('配置已保存');
        } catch (e) { showToast('保存失败', 'danger'); }
    });

    const loadDashboard = async () => {
        try {
            const data = await apiFetch('/api/stats.php');
            document.querySelector('[data-stat="sent"]').textContent = data.sent || 0;
            document.querySelector('[data-stat="received"]').textContent = data.received || 0;
            document.querySelector('[data-stat="active"]').textContent = data.active || 0;
        } catch (e) { console.error(e); }
    };

    const loadAdminContacts = async () => {
        const data = await apiFetch('/api/contacts.php');
        const list = document.querySelector('[data-admin-contacts]');
        list.innerHTML = (data.contacts || []).map(c => `
            <tr>
                <td>${c.phone}</td>
                <td>${c.tags || '-'}</td>
                <td><span class="badge ${c.status === 'blocked' ? 'bg-danger' : 'bg-success'}">${c.status}</span></td>
                <td>
                    <button class="btn btn-sm btn-outline-primary" onclick="toggleBlock('${c.id}', '${c.status}')">切换拉黑</button>
                    <button class="btn btn-sm btn-outline-danger" onclick="deleteContact('${c.id}')">删除</button>
                </td>
            </tr>
        `).join('');
    };
    
    window.toggleBlock = async (id, currentStatus) => {
        const newStatus = currentStatus === 'blocked' ? 'normal' : 'blocked';
        await apiFetch(`/api/contacts.php?action=update&id=${id}`, { method: 'POST', body: { status: newStatus } });
        loadAdminContacts();
    };
    
    window.deleteContact = async (id) => {
        if (!confirm('确定删除？')) return;
        await apiFetch(`/api/contacts.php?action=delete&id=${id}`, { method: 'POST' });
        loadAdminContacts();
    };

    const loadAdminMessages = async () => {
        const data = await apiFetch('/api/messages.php');
        const list = document.querySelector('[data-admin-messages]');
        list.innerHTML = (data.messages || []).map(m => `
            <tr>
                <td>${m.phone}</td>
                <td>${m.direction}</td>
                <td>${m.body}</td>
                <td>${m.created_at}</td>
            </tr>
        `).join('');
    };
    
    const loadAutoReplies = async () => {
        const data = await apiFetch('/api/auto_reply.php');
        const list = document.querySelector('[data-reply-list]');
        list.innerHTML = (data.rules || []).map(r => `
            <li class="list-group-item d-flex justify-content-between">
                <div><b>${r.keyword}</b>: ${r.reply}</div>
                <button class="btn btn-sm btn-danger" onclick="deleteRule('${r.id}')">删除</button>
            </li>
        `).join('');
    };

    window.deleteRule = async (id) => {
        await apiFetch(`/api/auto_reply.php?action=delete&id=${id}`, { method: 'POST' });
        loadAutoReplies();
    };

    const loadSettings = async () => {
        const data = await apiFetch('/api/settings.php');
        if (!data) return;
        const form = document.querySelector('[data-settings-form]');
        form.sid.value = data.sid || '';
        form.token.value = data.token || '';
        form.from.value = data.from || '';
        form.webhook.value = data.webhook || '';
    };

    loadDashboard();
};

document.addEventListener('DOMContentLoaded', () => {
  if (document.body.dataset.page === 'admin') initAdmin();
});