import { Component, ErrorInfo, ReactNode } from 'react'
import { Button } from './ui'

interface Props {
  children: ReactNode
  fallback?: ReactNode
  /**
   * 该边界是否铺满整个视口。
   *
   * 应用最外层的边界应铺满(`true`,默认);而当边界下沉到
   * 路由级、嵌在 SiteLayout 的 <main> 里时,铺满视口会撑开
   * 布局并让页头页脚错位 —— 那种场景传 `false`,改为局部卡片。
   */
  fullScreen?: boolean
}

interface State {
  hasError: boolean
  error: Error | null
}

export class ErrorBoundary extends Component<Props, State> {
  public state: State = {
    hasError: false,
    error: null,
  }

  public static getDerivedStateFromError(error: Error): State {
    return { hasError: true, error }
  }

  public componentDidCatch(error: Error, errorInfo: ErrorInfo) {
    console.error('Uncaught error:', error, errorInfo)
  }

  public render() {
    if (this.state.hasError) {
      if (this.props.fallback) {
        return this.props.fallback
      }
      const fullScreen = this.props.fullScreen ?? true
      return (
        <div
          className={
            fullScreen
              ? 'flex min-h-screen items-center justify-center bg-paper-50 p-6'
              : 'flex min-h-[50vh] items-center justify-center p-6'
          }
          role="alert"
        >
          <div className="max-w-md space-y-3 border border-ink-900 bg-paper-50 p-6 text-center">
            <p className="text-2xs tracking-[0.3em] text-ink-400">EXCEPTION</p>
            <h2 className="font-serif text-lg font-bold text-ink-900">页面出现错误</h2>
            <p className="text-sm leading-relaxed text-ink-500">
              {this.state.error?.message || '未知错误'}
            </p>
            <Button size="sm" onClick={() => this.setState({ hasError: false, error: null })}>
              重试
            </Button>
          </div>
        </div>
      )
    }

    return this.props.children
  }
}