/**
 * AppShell — 应用壳
 *
 * 窗口拖拽约定（Tauri overlay title bar）:
 * - 仅使用 data-tauri-drag-region 处理拖拽和双击缩放
 * - 不叠加 CSS app-region 或 React 双击处理，避免一次双击切换两次
 * - 标签栏空白区也由 Tauri 原生拖拽区处理
 */

import type { ReactNode } from 'react'
import { PanelLeft } from 'lucide-react'
import Sidebar from '../components/layout/Sidebar'
import TabBar from '../components/layout/TabBar'
import TabContent from '../components/layout/TabContent'
import StatusBar from '../components/layout/StatusBar'
import type { Session } from '../stores'
import { getDesktopPlatform } from '../platform/runtime'

export interface AppShellProps {
  activeTabId: string | null
  isMobile: boolean
  sidebarCollapsed: boolean
  mobileSidebarOpen: boolean
  onToggleSidebar: () => void
  onToggleMobileSidebar: () => void
  onCloseMobileSidebar: () => void
  onNewSession: () => void
  onQuickConnect: () => void
  onOpenLauncher: () => void
  onEditSession: (session: Session) => void
  children?: ReactNode
}

function TitleBar() {
  const platform = getDesktopPlatform()
  // Overlay title bar is macOS-only; Win/Linux keep the native chrome.
  if (platform !== 'macos') return null

  return (
    <header
      data-tauri-drag-region
      className="bg-dark-900/95 flex h-10 flex-shrink-0 select-none items-center border-b border-dark-800"
    >
      <div data-tauri-drag-region className="h-full w-[78px] flex-shrink-0" aria-hidden />
      <div data-tauri-drag-region className="flex h-full min-w-0 flex-1 items-center justify-center px-2">
        <span className="pointer-events-none truncate text-[11px] tracking-wide text-txt-faint">OpsXShell</span>
      </div>
      <div data-tauri-drag-region className="h-full w-[78px] flex-shrink-0" aria-hidden />
    </header>
  )
}

function MobileMenuButton({ onClick }: { onClick: () => void }) {
  return (
    <button
      type="button"
      onClick={onClick}
      className="titlebar-no-drag flex h-10 w-10 items-center justify-center text-txt-muted transition-colors hover:bg-dark-800 hover:text-content-primary"
      aria-label="切换侧边栏"
    >
      <svg className="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24" aria-hidden>
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 12h16M4 18h16" />
      </svg>
    </button>
  )
}

function ExpandSidebarButton({ onClick }: { onClick: () => void }) {
  return (
    <button
      type="button"
      onClick={onClick}
      className="titlebar-no-drag flex h-10 w-10 flex-shrink-0 items-center justify-center border-r border-dark-700/40 text-txt-muted transition-colors hover:bg-dark-700/60 hover:text-content-primary"
      title="展开侧栏 (Ctrl/Cmd+B)"
      aria-label="展开侧栏"
    >
      <PanelLeft className="h-4 w-4" />
    </button>
  )
}

export default function AppShell({
  activeTabId,
  isMobile,
  sidebarCollapsed,
  mobileSidebarOpen,
  onToggleSidebar,
  onToggleMobileSidebar,
  onCloseMobileSidebar,
  onNewSession,
  onQuickConnect,
  onOpenLauncher,
  onEditSession,
  children,
}: AppShellProps) {
  const handleSidebarNewSession = () => {
    onNewSession()
    if (isMobile) onCloseMobileSidebar()
  }

  const handleSidebarQuickConnect = () => {
    onQuickConnect()
    if (isMobile) onCloseMobileSidebar()
  }

  const handleSidebarEditSession = (session: Session) => {
    onEditSession(session)
    if (isMobile) onCloseMobileSidebar()
  }

  const desktopSidebarHidden = !isMobile && sidebarCollapsed

  return (
    <div className="flex h-screen flex-col overflow-hidden bg-dark-900 text-content-primary">
      <TitleBar />

      <div className="flex min-h-0 flex-1 overflow-hidden">
        {isMobile && mobileSidebarOpen && (
          <div
            className="titlebar-no-drag fixed inset-0 z-40 bg-black/50 transition-opacity duration-300"
            onClick={onCloseMobileSidebar}
            aria-hidden
          />
        )}

        <aside
          className={`titlebar-no-drag h-full flex-shrink-0 transition-[width,transform] duration-200 ease-in-out ${
            isMobile
              ? `fixed inset-y-0 left-0 top-10 z-50 ${mobileSidebarOpen ? 'translate-x-0' : '-translate-x-full'}`
              : desktopSidebarHidden
                ? 'w-0 overflow-hidden border-0'
                : ''
          } `}
          aria-hidden={desktopSidebarHidden}
        >
          <Sidebar
            onNewSession={handleSidebarNewSession}
            onQuickConnect={handleSidebarQuickConnect}
            onEditSession={handleSidebarEditSession}
            onCollapse={isMobile ? undefined : onToggleSidebar}
          />
        </aside>

        <main className="flex min-w-0 flex-1 flex-col bg-dark-800">
          <div className="flex items-stretch">
            {isMobile && <MobileMenuButton onClick={onToggleMobileSidebar} />}
            {desktopSidebarHidden && <ExpandSidebarButton onClick={onToggleSidebar} />}
            <div className="min-w-0 flex-1">
              <TabBar onOpenLauncher={onOpenLauncher} />
            </div>
          </div>

          <div className="titlebar-no-drag min-h-0 flex-1 overflow-hidden">
            <TabContent activeTabId={activeTabId} onNewSession={onNewSession} onQuickConnect={onQuickConnect} />
          </div>
        </main>
      </div>

      <div className="titlebar-no-drag">
        <StatusBar />
      </div>

      <div className="titlebar-no-drag">{children}</div>
    </div>
  )
}