/*
 * app.js
 * 主逻辑：渲染工具列表、处理交互、调用 API 或本地模拟。
 */

(function () {
  'use strict';

  // ---------- DOM ----------
  const toolsGrid = document.getElementById('toolsGrid');
  const panel = document.getElementById('panel');
  const panelTitle = document.getElementById('panelTitle');
  const panelDesc = document.getElementById('panelDesc');
  const inputBox = document.getElementById('inputBox');
  const outputBox = document.getElementById('outputBox');
  const runBtn = document.getElementById('runBtn');
  const copyBtn = document.getElementById('copyBtn');
  const clearBtn = document.getElementById('clearBtn');
  const closePanel = document.getElementById('closePanel');
  const settingsBtn = document.getElementById('settingsBtn');
  const settingsModal = document.getElementById('settingsModal');
  const apiBase = document.getElementById('apiBase');
  const apiKey = document.getElementById('apiKey');
  const apiModel = document.getElementById('apiModel');
  const saveSettings = document.getElementById('saveSettings');
  const cancelSettings = document.getElementById('cancelSettings');
  const yearEl = document.getElementById('year');

  // ---------- 状态 ----------
  let currentTool = null;
  const SETTINGS_KEY = 'ai-tool-station-settings';

  // ---------- 初始化 ----------
  function init() {
    yearEl.textContent = new Date().getFullYear();
    renderTools();
    loadSettings();
    bindEvents();
  }

  // 渲染工具卡片
  function renderTools() {
    toolsGrid.innerHTML = '';
    TOOLS.forEach((tool) => {
      const card = document.createElement('button');
      card.className = 'tool-card';
      card.type = 'button';
      card.innerHTML = `
        <span class="tool-icon">${tool.icon}</span>
        <div class="tool-name">${escapeHtml(tool.name)}</div>
        <div class="tool-desc">${escapeHtml(tool.desc)}</div>
      `;
      card.addEventListener('click', () => openTool(tool));
      toolsGrid.appendChild(card);
    });
  }

  // 打开某个工具
  function openTool(tool) {
    currentTool = tool;
    panelTitle.textContent = `${tool.icon} ${tool.name}`;
    panelDesc.textContent = tool.desc;
    inputBox.placeholder = tool.placeholder || '请输入内容...';
    inputBox.value = '';
    outputBox.textContent = '';
    panel.hidden = false;
    panel.scrollIntoView({ behavior: 'smooth', block: 'start' });
    inputBox.focus();
  }

  // 运行工具
  async function run() {
    if (!currentTool) return;
    const input = inputBox.value.trim();
    if (!input) {
      outputBox.textContent = '⚠️ 请先输入内容。';
      return;
    }

    runBtn.disabled = true;
    runBtn.textContent = '⏳ 生成中...';
    outputBox.textContent = '正在生成，请稍候...';

    try {
      const settings = getSettings();
      let result;
      if (settings.apiKey && settings.apiBase && settings.apiModel) {
        result = await callRealAPI(settings, currentTool, input);
      } else {
        // 模拟延迟，体验更真实
        await sleep(400);
        result = mockRun(currentTool.id, input);
      }
      outputBox.textContent = result;
    } catch (err) {
      outputBox.textContent = '❌ 出错了：' + (err && err.message ? err.message : String(err));
    } finally {
      runBtn.disabled = false;
      runBtn.textContent = '✨ 运行';
    }
  }

  // 调用真实 OpenAI 兼容 API
  async function callRealAPI(settings, tool, input) {
    const base = settings.apiBase.replace(/\/+$/, '');
    const url = base + '/chat/completions';
    const body = {
      model: settings.apiModel,
      messages: [
        { role: 'system', content: '你是一个专业、简洁的 AI 助手，用中文回答。' },
        { role: 'user', content: tool.prompt(input) }
      ],
      temperature: 0.7
    };

    const resp = await fetch(url, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': 'Bearer ' + settings.apiKey
      },
      body: JSON.stringify(body)
    });

    if (!resp.ok) {
      const t = await resp.text().catch(() => '');
      throw new Error(`HTTP ${resp.status} ${t.slice(0, 200)}`);
    }

    const data = await resp.json();
    const content = data && data.choices && data.choices[0] && data.choices[0].message
      ? data.choices[0].message.content
      : '';
    return content || '（API 返回为空）';
  }

  // ---------- 设置 ----------
  function getSettings() {
    try {
      return JSON.parse(localStorage.getItem(SETTINGS_KEY) || '{}');
    } catch (_) {
      return {};
    }
  }

  function loadSettings() {
    const s = getSettings();
    apiBase.value = s.apiBase || '';
    apiKey.value = s.apiKey || '';
    apiModel.value = s.apiModel || '';
  }

  function saveSettingsToStorage() {
    const s = {
      apiBase: apiBase.value.trim(),
      apiKey: apiKey.value.trim(),
      apiModel: apiModel.value.trim()
    };
    localStorage.setItem(SETTINGS_KEY, JSON.stringify(s));
  }

  // ---------- 事件绑定 ----------
  function bindEvents() {
    runBtn.addEventListener('click', run);

    copyBtn.addEventListener('click', async () => {
      const text = outputBox.textContent || '';
      if (!text) return;
      try {
        await navigator.clipboard.writeText(text);
        copyBtn.textContent = '✅ 已复制';
        setTimeout(() => (copyBtn.textContent = '📋 复制结果'), 1200);
      } catch (_) {
        // 降级
        const ta = document.createElement('textarea');
        ta.value = text;
        document.body.appendChild(ta);
        ta.select();
        document.execCommand('copy');
        document.body.removeChild(ta);
        copyBtn.textContent = '✅ 已复制';
        setTimeout(() => (copyBtn.textContent = '📋 复制结果'), 1200);
      }
    });

    clearBtn.addEventListener('click', () => {
      inputBox.value = '';
      outputBox.textContent = '';
      inputBox.focus();
    });

    closePanel.addEventListener('click', () => {
      panel.hidden = true;
      currentTool = null;
    });

    settingsBtn.addEventListener('click', () => {
      loadSettings();
      settingsModal.hidden = false;
    });

    cancelSettings.addEventListener('click', () => {
      settingsModal.hidden = true;
    });

    saveSettings.addEventListener('click', () => {
      saveSettingsToStorage();
      settingsModal.hidden = true;
    });

    // 点击遮罩关闭
    settingsModal.addEventListener('click', (e) => {
      if (e.target === settingsModal) settingsModal.hidden = true;
    });

    // 快捷键：Ctrl/Cmd + Enter 运行
    inputBox.addEventListener('keydown', (e) => {
      if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
        e.preventDefault();
        run();
      }
    });
  }

  // ---------- 工具函数 ----------
  function sleep(ms) {
    return new Promise((r) => setTimeout(r, ms));
  }

  function escapeHtml(str) {
    return String(str)
      .replace(/&/g, '&amp;')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;')
      .replace(/'/g, '&#39;');
  }

  // 启动
  init();
})();