import { themeManager } from './theme-manager.js';
import { TabManager } from './tab-manager.js';
import { WorkspaceManager } from './workspace-manager.js';
import { CommandPalette } from './command-palette.js';
import { SettingsModal } from './settings.js';
import { ContextMenu } from './context-menu.js';

class TerminalApp {
  constructor() {
    this.initElements();
    this.initTheme();
    this.initTabManager();
    this.initWorkspaceManager();
    this.initContextMenu();
    this.initModals();
    this.initSearch();
    this.initWindowControls();
    this.initIpcListeners();
    this.initKeyboardShortcuts();
    this.initStatusBar();
  }

  initElements() {
    this.tabBar = document.getElementById('tab-bar');
    this.viewport = document.getElementById('main-viewport');
    this.newTabBtn = document.getElementById('btn-new-tab');
    this.commandPaletteOverlay = document.getElementById('command-palette-overlay');
    this.commandPaletteInput = document.getElementById('command-palette-input');
    this.commandPaletteList = document.getElementById('command-palette-list');
    this.settingsOverlay = document.getElementById('settings-overlay');
    this.settingsModal = document.getElementById('settings-modal');
    this.searchBar = document.getElementById('search-bar');
    this.searchInput = document.getElementById('search-input');
    this.searchClose = document.getElementById('search-close');
    this.searchNext = document.getElementById('search-next');
    this.searchPrev = document.getElementById('search-prev');

    this.statusTheme = document.getElementById('status-theme');
    this.statusShell = document.getElementById('status-shell');
    this.statusHost = document.getElementById('status-host');
  }

  initTheme() {
    themeManager.init();
    if (this.statusTheme) {
      this.statusTheme.textContent = themeManager.getCurrentTheme().name;
    }
    themeManager.onThemeChange((theme) => {
      if (this.statusTheme) {
        this.statusTheme.textContent = theme.name;
      }
    });
  }

  initTabManager() {
    this.tabManager = new TabManager({
      tabBar: this.tabBar,
      viewport: this.viewport,
      getSpawnOptions: (wsId) => (this.workspaceManager ? this.workspaceManager.getSpawnOptions(wsId) : {}),
      onActiveChange: (activeTerm) => {
        if (activeTerm && this.statusShell) {
          this.statusShell.textContent = activeTerm.title || 'bash';
        }
        this.updateSplitButtonsState(activeTerm);
      },
      onContextMenu: (e, term) => {
        this.contextMenu?.show(e, term);
      },
    });

    this.newTabBtn.addEventListener('click', () => {
      const activeWs = this.workspaceManager ? this.workspaceManager.getActiveWorkspace() : null;
      const spawnOpts = this.workspaceManager ? this.workspaceManager.getSpawnOptions(activeWs?.id) : {};
      this.tabManager.createTab({
        workspaceId: activeWs?.id,
        title: spawnOpts.title,
        cwd: spawnOpts.cwd,
        shell: spawnOpts.shell,
        args: spawnOpts.args,
      });
    });
  }

  updateSplitButtonsState(activeTerm) {
    const isAgent = !!(
      activeTerm?.isAgent ||
      activeTerm?.element?.closest?.('.agent-panel') ||
      activeTerm?.terminalWrapper?.closest?.('.agent-panel')
    );
    const btnH = document.getElementById('btn-split-h');
    const btnV = document.getElementById('btn-split-v');
    if (btnH) {
      btnH.disabled = isAgent;
      btnH.classList.toggle('disabled', isAgent);
      btnH.title = isAgent ? 'Agent 面板不可分屏' : '水平分屏 (Ctrl+Shift+E)';
    }
    if (btnV) {
      btnV.disabled = isAgent;
      btnV.classList.toggle('disabled', isAgent);
      btnV.title = isAgent ? 'Agent 面板不可分屏' : '垂直分屏 (Ctrl+Shift+O)';
    }
  }

  initWorkspaceManager() {
    this.workspaceManager = new WorkspaceManager({
      tabManager: this.tabManager,
    });
  }

  initContextMenu() {
    this.contextMenu = new ContextMenu({
      tabManager: this.tabManager,
      workspaceManager: this.workspaceManager,
    });

    window.addEventListener('terminal-contextmenu', (e) => {
      this.contextMenu?.show(e.detail.event, e.detail.termView);
    });
  }

  initModals() {
    this.commandPalette = new CommandPalette({
      overlay: this.commandPaletteOverlay,
      input: this.commandPaletteInput,
      list: this.commandPaletteList,
      tabManager: this.tabManager,
      workspaceManager: this.workspaceManager,
      onOpenSettings: () => this.settings.open(),
      onToggleSearch: () => this.toggleSearch(),
    });

    this.settings = new SettingsModal({
      overlay: this.settingsOverlay,
      modal: this.settingsModal,
      tabManager: this.tabManager,
    });

    // 快捷按钮绑定
    document.getElementById('btn-palette')?.addEventListener('click', () => {
      this.commandPalette.toggle();
    });

    document.getElementById('btn-settings')?.addEventListener('click', () => {
      this.settings.open();
    });

    document.getElementById('btn-split-h')?.addEventListener('click', () => {
      const tab = this.tabManager.getActiveTab();
      if (tab && !tab.splitTree.activeTerminal?.isAgent) {
        tab.splitTree.splitCurrent('horizontal');
      }
    });

    document.getElementById('btn-split-v')?.addEventListener('click', () => {
      const tab = this.tabManager.getActiveTab();
      if (tab && !tab.splitTree.activeTerminal?.isAgent) {
        tab.splitTree.splitCurrent('vertical');
      }
    });

    document.getElementById('btn-file-browser')?.addEventListener('click', () => {
      this.toggleFileBrowser();
    });

    document.getElementById('btn-search')?.addEventListener('click', () => {
      this.toggleSearch();
    });

    document.getElementById('status-theme')?.addEventListener('click', () => {
      this.commandPalette.open();
      this.commandPalette.input.value = '切换主题';
      this.commandPalette.filter('切换主题');
    });
  }

  initSearch() {
    const doSearch = (direction = 'next') => {
      const term = this.tabManager.getActiveTerminal();
      const query = this.searchInput.value;
      if (!term || !query) return;

      if (direction === 'next') {
        term.searchAddon.findNext(query, { incremental: true });
      } else {
        term.searchAddon.findPrevious(query);
      }
    };

    this.searchInput.addEventListener('input', () => doSearch('next'));
    this.searchInput.addEventListener('keydown', (e) => {
      if (e.key === 'Enter') {
        e.preventDefault();
        doSearch(e.shiftKey ? 'prev' : 'next');
      } else if (e.key === 'Escape') {
        e.preventDefault();
        this.closeSearch();
      }
    });

    this.searchNext?.addEventListener('click', () => doSearch('next'));
    this.searchPrev?.addEventListener('click', () => doSearch('prev'));
    this.searchClose?.addEventListener('click', () => this.closeSearch());
  }

  toggleSearch() {
    if (this.searchBar.classList.contains('active')) {
      this.closeSearch();
    } else {
      this.searchBar.classList.add('active');
      this.searchInput.value = '';
      this.searchInput.focus();
    }
  }

  closeSearch() {
    this.searchBar.classList.remove('active');
    const term = this.tabManager.getActiveTerminal();
    if (term) {
      term.searchAddon.clearDecorations();
      term.focus();
    }
  }

  toggleFileBrowser(initialDir = null) {
    const tab = this.tabManager?.getActiveTab();
    if (!tab || !tab.splitTree) return null;
    return tab.splitTree.toggleFilePanel(initialDir);
  }

  initWindowControls() {
    document.getElementById('win-min')?.addEventListener('click', () => {
      window.terminalAPI.minimize();
    });

    document.getElementById('win-max')?.addEventListener('click', () => {
      window.terminalAPI.maximize();
    });

    document.getElementById('win-close')?.addEventListener('click', () => {
      window.terminalAPI.close();
    });

    // 双击标题栏空白处最大化/还原
    document.getElementById('titlebar-drag-spacer')?.addEventListener('dblclick', () => {
      window.terminalAPI.maximize();
    });
    document.querySelector('.app-brand')?.addEventListener('dblclick', () => {
      window.terminalAPI.maximize();
    });
  }

  initIpcListeners() {
    // 监听 PTY 数据并派发给对应 terminal
    window.terminalAPI.onPtyData(({ id, data }) => {
      for (const tab of this.tabManager.tabs.values()) {
        const info = tab.splitTree.terminals.get(id);
        if (info) {
          info.termView.xterm.write(data);
          break;
        }
      }
    });

    // 监听 PTY 退出事件
    window.terminalAPI.onPtyExit(({ id, exitCode }) => {
      for (const tab of this.tabManager.tabs.values()) {
        if (tab.splitTree.terminals.has(id)) {
          tab.splitTree.closeTerminal(id);
          break;
        }
      }
    });
  }

  initKeyboardShortcuts() {
    window.addEventListener(
      'keydown',
      (e) => {
        // Ctrl+Shift+P 或 F1: 命令面板
        if ((e.ctrlKey && e.shiftKey && e.key.toLowerCase() === 'p') || e.key === 'F1') {
          e.preventDefault();
          e.stopPropagation();
          this.commandPalette.toggle();
          return;
        }

        // Ctrl+B: 切换左侧工作区侧边栏
        if (e.ctrlKey && !e.shiftKey && !e.altKey && e.key.toLowerCase() === 'b') {
          e.preventDefault();
          e.stopPropagation();
          this.workspaceManager?.toggleSidebar();
          return;
        }

        const isEditingText = (el) => {
          if (!el) return false;
          const tag = el.tagName?.toLowerCase();
          return (tag === 'input' || tag === 'textarea') && !el.classList.contains('xterm-helper-textarea');
        };

        // Ctrl+Shift+C: 复制当前选中终端文本
        if (e.ctrlKey && e.shiftKey && e.key.toLowerCase() === 'c') {
          if (isEditingText(e.target)) return;
          e.preventDefault();
          e.stopPropagation();
          const activeTerm = this.tabManager.getActiveTerminal();
          if (activeTerm) activeTerm.copySelection();
          return;
        }

        // Ctrl+Shift+V: 粘贴剪贴板文本到当前终端
        if (e.ctrlKey && e.shiftKey && e.key.toLowerCase() === 'v') {
          if (isEditingText(e.target)) return;
          e.preventDefault();
          e.stopPropagation();
          const activeTerm = this.tabManager.getActiveTerminal();
          if (activeTerm) activeTerm.pasteFromClipboard();
          return;
        }

        // Ctrl+Shift+T: 新建当前工作区标签页
        if (e.ctrlKey && e.shiftKey && e.key.toLowerCase() === 't') {
          e.preventDefault();
          e.stopPropagation();
          const activeWs = this.workspaceManager ? this.workspaceManager.getActiveWorkspace() : null;
          const spawnOpts = this.workspaceManager ? this.workspaceManager.getSpawnOptions(activeWs?.id) : {};
          this.tabManager.createTab({
            workspaceId: activeWs?.id,
            title: spawnOpts.title,
            cwd: spawnOpts.cwd,
            shell: spawnOpts.shell,
            args: spawnOpts.args,
          });
          return;
        }

        // Ctrl+Shift+W: 关闭窗格
        if (e.ctrlKey && e.shiftKey && e.key.toLowerCase() === 'w') {
          e.preventDefault();
          e.stopPropagation();
          const tab = this.tabManager.getActiveTab();
          if (tab && tab.splitTree.activeTerminal) {
            tab.splitTree.closeTerminal(tab.splitTree.activeTerminal.id);
          }
          return;
        }

        // Ctrl+Shift+E: 水平分屏 (左右)
        if (e.ctrlKey && e.shiftKey && e.key.toLowerCase() === 'e') {
          e.preventDefault();
          e.stopPropagation();
          const tab = this.tabManager.getActiveTab();
          if (tab && !tab.splitTree.activeTerminal?.isAgent) {
            tab.splitTree.splitCurrent('horizontal');
          }
          return;
        }

        // Ctrl+Shift+O: 垂直分屏 (上下)
        if (e.ctrlKey && e.shiftKey && e.key.toLowerCase() === 'o') {
          e.preventDefault();
          e.stopPropagation();
          const tab = this.tabManager.getActiveTab();
          if (tab && !tab.splitTree.activeTerminal?.isAgent) {
            tab.splitTree.splitCurrent('vertical');
          }
          return;
        }

        // Ctrl+Shift+F: 搜索
        if (e.ctrlKey && e.shiftKey && e.key.toLowerCase() === 'f') {
          e.preventDefault();
          e.stopPropagation();
          this.toggleSearch();
          return;
        }

        // Ctrl+Shift+U 或 Alt+F: 切换文件浏览面板
        if ((e.ctrlKey && e.shiftKey && e.key.toLowerCase() === 'u') || (e.altKey && !e.ctrlKey && !e.shiftKey && e.key.toLowerCase() === 'f')) {
          e.preventDefault();
          e.stopPropagation();
          this.toggleFileBrowser();
          return;
        }

        // Ctrl+,: 设置
        if (e.ctrlKey && e.key === ',') {
          e.preventDefault();
          e.stopPropagation();
          this.settings.open();
          return;
        }

        // Ctrl+Tab / Ctrl+Shift+Tab: 标签页切换
        if (e.ctrlKey && e.key === 'Tab') {
          e.preventDefault();
          e.stopPropagation();
          if (e.shiftKey) {
            this.tabManager.prevTab();
          } else {
            this.tabManager.nextTab();
          }
          return;
        }

        // Alt+1 .. Alt+9: 快速直达标签页
        if (e.altKey && e.key >= '1' && e.key <= '9') {
          e.preventDefault();
          e.stopPropagation();
          const index = parseInt(e.key, 10) - 1;
          const ids = Array.from(this.tabManager.tabs.keys());
          if (ids[index]) {
            this.tabManager.switchTab(ids[index]);
          }
        }
      },
      true // 启用捕获阶段，确保终端即使在聚焦/输入状态下应用级快捷键也能被优先拦截响应
    );
  }

  async initStatusBar() {
    try {
      const info = await window.terminalAPI.getSystemInfo();
      if (info && this.statusHost) {
        this.statusHost.textContent = `${info.user}@${info.hostname}`;
      }
    } catch (e) {
      console.warn('Failed to load system info:', e);
    }
  }
}

// 页面加载就绪后启动终端
window.addEventListener('DOMContentLoaded', () => {
  window.terminalApp = new TerminalApp();
});