import { Component, type ErrorInfo, type ReactNode } from 'react';
import { Button } from '@/components/ui/button';
import { AlertTriangle, RotateCcw, Home, Bug } from 'lucide-react';
import { toast } from 'sonner';
import i18n from '@/i18n';

interface Props {
  children: ReactNode;
  fallback?: ReactNode;
}

interface State {
  hasError: boolean;
  error: Error | null;
  errorInfo: ErrorInfo | null;
}

function isChunkLoadError(error: Error | null) {
  // 发版后旧入口引用已删除 chunk 时，浏览器会抛动态 import 加载失败。 // Logan.Li
  const message = error?.message || '';
  return message.includes('Failed to fetch dynamically imported module') ||
    message.includes('Importing a module script failed') ||
    message.includes('ChunkLoadError') ||
    message.includes('Loading chunk');
}

/**
 * ErrorBoundary - 全局错误边界组件
 * 
 * 捕获 React 组件树中的错误，防止整个应用崩溃
 * 提供友好的错误提示和恢复操作
 */
export class ErrorBoundary extends Component<Props, State> {
  constructor(props: Props) {
    super(props);
    this.state = { hasError: false, error: null, errorInfo: null };
  }

  static getDerivedStateFromError(error: Error): State {
    return { hasError: true, error, errorInfo: null };
  }

  override componentDidCatch(error: Error, errorInfo: ErrorInfo) {
    console.error(i18n.t('common.ebCaughtError'), error);
    console.error(i18n.t('common.ebErrorInfo'), errorInfo.componentStack);
    this.setState({ error, errorInfo });
  }

  handleRetry = () => {
    if (isChunkLoadError(this.state.error)) {
      window.location.reload();
      return;
    }
    this.setState({ hasError: false, error: null, errorInfo: null });
  };

  handleGoHome = () => {
    window.location.href = '/';
  };

  handleReport = () => {
    const { error, errorInfo } = this.state;
    const body = `## ${i18n.t('common.ebReportTitle')}\n\n**${i18n.t('common.ebReportTime')}:** ${new Date().toISOString()}\n**URL:** ${window.location.href}\n**${i18n.t('common.ebReportUA')}:** ${navigator.userAgent}\n\n### ${i18n.t('common.ebReportErrorMsg')}\n\n\`\`\`\n${error?.name}: ${error?.message}\n\`\`\`\n\n### ${i18n.t('common.ebReportStack')}\n\n\`\`\`\n${errorInfo?.componentStack}\n\`\`\`\n`;
    navigator.clipboard.writeText(body).then(() => {
      toast.success(i18n.t('common.errorCopiedToClipboard'));
    }).catch(() => {
      toast.error(i18n.t('common.copyFailedManual'));
    });
  };

  override render() {
    if (this.state.hasError) {
      if (this.props.fallback) {
        return this.props.fallback;
      }
      const chunkLoadError = isChunkLoadError(this.state.error);

      return (
        <div className="min-h-[60vh] flex items-center justify-center p-6">
          <div className="dg-card max-w-lg w-full p-8 text-center space-y-6">
            {/* Error Icon */}
            <div className="mx-auto w-16 h-16 rounded-2xl bg-red-500/10 flex items-center justify-center">
              <AlertTriangle className="h-8 w-8 dg-text-red" />
            </div>

            {/* Title */}
            <div>
              <h2 className="text-xl font-bold text-[var(--dg-text-primary)]">
                {i18n.t('common.ebPageError')}
              </h2>
              <p className="text-sm text-[var(--dg-text-muted)] mt-2">
                {chunkLoadError ? i18n.t('common.ebChunkDescription') : i18n.t('common.ebDescription')}
              </p>
            </div>

            {/* Error Detail (collapsible) */}
            {this.state.error && (
              <div className="text-left">
                <details className="group">
                  <summary className="cursor-pointer text-xs text-[var(--dg-text-secondary)] hover:text-[var(--dg-text-primary)] transition-colors flex items-center gap-1.5">
                    <Bug className="h-3.5 w-3.5" />
                    {i18n.t('common.ebViewDetails')}
                  </summary>
                  <div className="mt-2 p-3 rounded-lg bg-[var(--dg-bg-tertiary)] border border-[var(--dg-border)] overflow-auto max-h-48">
                    <code className="text-xs dg-text-red font-mono block whitespace-pre-wrap">
                      {this.state.error.name}: {this.state.error.message}
                    </code>
                    {this.state.errorInfo && (
                      <pre className="text-xs text-[var(--dg-text-muted)] mt-2 whitespace-pre-wrap">
                        {this.state.errorInfo.componentStack}
                      </pre>
                    )}
                  </div>
                </details>
              </div>
            )}

            {/* Actions */}
            <div className="flex items-center justify-center gap-3">
              <Button
                variant="outline"
                className="dg-btn-secondary"
                onClick={this.handleGoHome}
              >
                <Home className="h-4 w-4 mr-1.5" />
                {i18n.t('common.ebGoHome')}
              </Button>
              <Button
                className="dg-btn-primary"
                onClick={this.handleRetry}
              >
                <RotateCcw className="h-4 w-4 mr-1.5" />
                {chunkLoadError ? i18n.t('common.reloadPage') : i18n.t('common.reload')}
              </Button>
              <Button
                variant="outline"
                className="dg-btn-ghost"
                onClick={this.handleReport}
              >
                <Bug className="h-4 w-4 mr-1.5" />
                {i18n.t('common.ebCopyError')}
              </Button>
            </div>
          </div>
        </div>
      );
    }

    return this.props.children;
  }
}