// Prompt Generator — 全局 JS 模块

const API = {
    async request(method, path, body) {
        const opts = {
            method,
            headers: { 'Content-Type': 'application/json' },
            credentials: 'same-origin',
        };
        if (body !== undefined) {
            opts.body = JSON.stringify(body);
        }
        const resp = await fetch(path, opts);
        const data = await resp.json();
        if (resp.status === 401) {
            Auth.showLoginModal();
            throw new Error('未登录');
        }
        if (data.code !== 0) {
            throw new Error(data.message || '请求失败');
        }
        return data.data;
    },
    get(path) { return this.request('GET', path); },
    post(path, body) { return this.request('POST', path, body); },
    put(path, body) { return this.request('PUT', path, body); },
    del(path) { return this.request('DELETE', path); },
};

// 认证模块
const Auth = {
    modal: null,

    showLoginModal() {
        if (this.modal) return;
        const overlay = document.createElement('div');
        overlay.className = 'modal-overlay';
        overlay.innerHTML = `
            <div class="modal">
                <div class="modal-title">🔐 输入访问密码</div>
                <input type="password" class="input mb-3" id="login-password" placeholder="请输入密码" autofocus>
                <div id="login-error" class="text-sm mb-3" style="color:var(--danger-color);display:none"></div>
                <button class="btn btn-primary w-full" id="login-btn">登录</button>
            </div>
        `;
        document.body.appendChild(overlay);
        this.modal = overlay;

        const input = overlay.querySelector('#login-password');
        const btn = overlay.querySelector('#login-btn');
        const err = overlay.querySelector('#login-error');

        const doLogin = async () => {
            try {
                btn.disabled = true;
                btn.textContent = '登录中...';
                await API.post('/api/auth/login', { password: input.value });
                overlay.remove();
                this.modal = null;
                Toast.success('登录成功');
                // Reload page data
                if (typeof onLogin === 'function') onLogin();
            } catch (e) {
                err.textContent = e.message;
                err.style.display = 'block';
                btn.disabled = false;
                btn.textContent = '登录';
            }
        };

        btn.onclick = doLogin;
        input.onkeydown = (e) => { if (e.key === 'Enter') doLogin(); };
    },

    async check() {
        try {
            await API.get('/api/auth/check');
            return true;
        } catch {
            return false;
        }
    },

    async logout() {
        try {
            await API.post('/api/auth/logout');
        } catch {}
        location.reload();
    }
};

// Toast 提示
const Toast = {
    show(message, type = 'success', duration = 3000) {
        const el = document.createElement('div');
        el.className = `toast toast-${type}`;
        el.textContent = message;
        document.body.appendChild(el);
        setTimeout(() => el.remove(), duration);
    },
    success(msg) { this.show(msg, 'success'); },
    error(msg) { this.show(msg, 'error', 5000); },
};

// 主题切换
const Theme = {
    init() {
        const saved = localStorage.getItem('theme');
        if (saved) {
            document.documentElement.setAttribute('data-theme', saved);
        } else if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
            document.documentElement.setAttribute('data-theme', 'dark');
        }
    },
    toggle() {
        const current = document.documentElement.getAttribute('data-theme');
        const next = current === 'dark' ? 'light' : 'dark';
        document.documentElement.setAttribute('data-theme', next);
        localStorage.setItem('theme', next);
    },
    isDark() {
        return document.documentElement.getAttribute('data-theme') === 'dark';
    }
};

// 草稿管理（localStorage）
const Draft = {
    save(key, data) {
        localStorage.setItem(`draft_${key}`, JSON.stringify(data));
    },
    load(key) {
        const raw = localStorage.getItem(`draft_${key}`);
        if (!raw) return null;
        try { return JSON.parse(raw); } catch { return null; }
    },
    clear(key) {
        localStorage.removeItem(`draft_${key}`);
    }
};

// 防抖
function debounce(fn, delay = 1000) {
    let timer;
    return function (...args) {
        clearTimeout(timer);
        timer = setTimeout(() => fn.apply(this, args), delay);
    };
}

// 工具函数
function escapeHtml(text) {
    const div = document.createElement('div');
    div.textContent = text;
    return div.innerHTML;
}

function truncateText(text, maxLen = 150) {
    if (!text) return '';
    // 跳过 XML 标签内容，提取用户实际输入
    const cleaned = text.replace(/<[a-zA-Z_-][^>]*>[\s\S]*?<\/[a-zA-Z_-][^>]*>/g, '').trim();
    if (cleaned.length <= maxLen) return cleaned;
    return cleaned.substring(0, maxLen) + '...';
}

function formatDate(dateStr) {
    if (!dateStr) return '';
    const d = new Date(dateStr);
    const pad = n => String(n).padStart(2, '0');
    return `${d.getFullYear()}-${pad(d.getMonth()+1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`;
}

// 初始化
Theme.init();

// 导航栏渲染
function renderNavbar(activePage) {
    const pages = [
        { id: 'builder', label: '构建器', href: '/' },
        { id: 'dashboard', label: '复盘看板', href: '/dashboard' },
        { id: 'settings', label: '设置', href: '/settings' },
    ];

    const nav = document.createElement('nav');
    nav.className = 'navbar';
    nav.innerHTML = `
        <div class="nav-brand">🔥 Prompt Generator</div>
        <div class="nav-tabs">
            ${pages.map(p => `<a class="nav-tab ${p.id === activePage ? 'active' : ''}" href="${p.href}">${p.label}</a>`).join('')}
        </div>
        <div class="nav-actions">
            <button class="btn btn-sm" onclick="Theme.toggle()" title="切换主题">${Theme.isDark() ? '☀️' : '🌙'}</button>
            <button class="btn btn-sm" onclick="Auth.logout()">退出</button>
        </div>
    `;
    document.body.insertBefore(nav, document.body.firstChild);
}