/**
 * Main Layout Component
 * TitleBar at top, then sidebar + content below.
 */
import { Outlet, useLocation, useNavigate } from 'react-router-dom';
import { useCallback, useEffect, useRef, useState } from 'react';
import { LockKeyhole, Settings2 } from 'lucide-react';
import { Sidebar } from './Sidebar';
import { TitleBar } from './TitleBar';
import { Button } from '@/components/ui/button';
import { getAiModuleForPath } from '@/lib/ai-modules';
import { useOpencodeStore } from '@/stores/opencode';
import { useProjectConfigStore } from '@/stores/project-config';
import { useSettingsStore } from '@/stores/settings';
import { cn } from '@/lib/utils';
import type { SidebarPeekSource } from './sidebar-peek';

const SIDEBAR_PEEK_CLOSE_DELAY_MS = 180;

export function MainLayout() {
  const activeProject = useOpencodeStore((state) => state.activeProject);
  const sidebarCollapsed = useSettingsStore((state) => state.sidebarCollapsed);
  const config = useProjectConfigStore((state) => activeProject ? state.configsByProjectId[activeProject.id] : undefined);
  const load = useProjectConfigStore((state) => state.load);
  const location = useLocation();
  const navigate = useNavigate();
  const [sidebarPeekOpen, setSidebarPeekOpen] = useState(false);
  const sidebarPeekCloseTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
  const sidebarPeekSourcesRef = useRef<Record<SidebarPeekSource, boolean>>({
    toggle: false,
    focus: false,
    sidebar: false,
    titlebar: false,
  });
  const activeModule = getAiModuleForPath(location.pathname);
  const isProgrammingModule = activeModule === 'programming';
  const isPaintingModule = activeModule === 'painting';
  const isLearningPlayer = location.pathname.startsWith('/learning/course/');
  const isPromptMuseum = location.pathname === '/image-prompts' || location.pathname.startsWith('/image-prompts/');
  const isChatWorkspace = location.pathname === '/opencode-chat';
  const isInitializationSafeRoute = location.pathname === '/project-config' || !isProgrammingModule;

  const handleSidebarPeekChange = useCallback((open: boolean, source: SidebarPeekSource) => {
    if (!sidebarCollapsed) return;

    const sources = sidebarPeekSourcesRef.current;
    if (sources[source] === open) return;

    if (sidebarPeekCloseTimerRef.current) {
      clearTimeout(sidebarPeekCloseTimerRef.current);
      sidebarPeekCloseTimerRef.current = null;
    }

    sources[source] = open;

    if (open) {
      setSidebarPeekOpen(true);
      return;
    }

    if (Object.values(sources).some(Boolean)) return;

    sidebarPeekCloseTimerRef.current = setTimeout(() => {
      if (Object.values(sidebarPeekSourcesRef.current).some(Boolean)) return;
      setSidebarPeekOpen(false);
      sidebarPeekCloseTimerRef.current = null;
    }, SIDEBAR_PEEK_CLOSE_DELAY_MS);
  }, [sidebarCollapsed]);

  useEffect(() => {
    sidebarPeekSourcesRef.current = { toggle: false, focus: false, sidebar: false, titlebar: false };
    // This transient state mirrors the external persisted sidebar preference;
    // reset it when that preference changes so a stale preview cannot reopen.
    // eslint-disable-next-line react-hooks/set-state-in-effect
    setSidebarPeekOpen(false);
    if (sidebarPeekCloseTimerRef.current) {
      clearTimeout(sidebarPeekCloseTimerRef.current);
      sidebarPeekCloseTimerRef.current = null;
    }
  }, [sidebarCollapsed]);

  useEffect(() => () => {
    if (sidebarPeekCloseTimerRef.current) clearTimeout(sidebarPeekCloseTimerRef.current);
  }, []);

  useEffect(() => {
    if (activeProject && isProgrammingModule) void load(activeProject.id).catch(() => undefined);
  }, [activeProject, isProgrammingModule, load]);

  const initializationBlocked = Boolean(activeProject && (!config || !config.initialized) && !isInitializationSafeRoute);
  return (
    <div data-testid="main-layout" className="relative flex h-[100dvh] flex-col overflow-hidden bg-transparent font-sans">
      {/* Title bar: drag region on macOS, icon + controls on Windows */}
      <TitleBar
        integrated={!isLearningPlayer}
        workspaceLayout={isChatWorkspace}
        overlay={isPaintingModule && !isPromptMuseum}
        pageTitle={isPromptMuseum ? '获取灵感' : undefined}
        sidebarPeekOpen={sidebarPeekOpen}
        onSidebarPeekChange={handleSidebarPeekChange}
      />

      {/* Below the title bar: sidebar + content */}
      <div className="relative flex min-h-0 flex-1 overflow-hidden">
        {!isLearningPlayer ? (
          <Sidebar
            workspaceLayout={isChatWorkspace}
            sidebarPeekOpen={sidebarPeekOpen}
            onSidebarPeekChange={handleSidebarPeekChange}
          />
        ) : null}
        <main
          data-testid="main-content"
          className={cn(
            'relative min-h-0 min-w-0 flex-1 overflow-auto bg-background',
            isPaintingModule || isLearningPlayer ? 'basis-0 h-full overflow-hidden p-0' : 'p-5 sm:p-6',
            isChatWorkspace && !isPaintingModule && 'basis-0 overflow-hidden p-0',
          )}
        >
          <Outlet />
          {initializationBlocked ? (
            <div data-testid="project-initialization-gate" className="glass-surface absolute inset-0 z-[100] flex items-center justify-center bg-background/90 p-6">
              <div className="surface-card max-w-md rounded-2xl border border-border/80 bg-background p-8 text-center shadow-float">
                <LockKeyhole className="mx-auto h-10 w-10" />
                <h1 className="mt-4 text-2xl font-semibold">项目尚未初始化</h1>
                <p className="mt-3 text-sm font-medium text-muted-foreground">请先在项目配置中完成至少一个手动 Agent 的名称、模型和职责设置。</p>
                <Button onClick={() => navigate('/project-config')} className="mt-6 border border-brand/20 bg-brand font-semibold text-primary-foreground"><Settings2 className="mr-2 h-4 w-4" />打开项目配置</Button>
              </div>
            </div>
          ) : null}
        </main>
      </div>
    </div>
  );
}