import type { ReactNode } from 'react';
import { Hand } from './Icons';
import type { Task } from '../types';

export type CardKind = 'confirm' | 'blocker' | 'question' | 'result' | 'danger' | 'info';

export interface CardAction {
  label: string;
  kind?: 'primary' | 'secondary' | 'danger' | 'text';
  disabled?: boolean;
  onClick: () => void;
}

export function ActionCard({ kind, title, body, actions = [], children }: {
  kind: CardKind;
  title: string;
  body?: string;
  actions?: CardAction[];
  children?: ReactNode;
}) {
  return (
    <section className={`card ${kind}`} data-kind={kind}>
      <header className="card-head">{title}</header>
      {body && <div className="card-body">{body}</div>}
      {children}
      {actions.length > 0 && (
        <div className="card-actions">
          {actions.map(action => (
            <button
              key={action.label}
              type="button"
              className={`${action.kind ?? 'secondary'}-button small`}
              disabled={action.disabled}
              onClick={action.onClick}
            >
              {action.label}
            </button>
          ))}
          <span className="card-hint">也可以直接在下方输入回答</span>
        </div>
      )}
    </section>
  );
}

export type PauseKind = 'confirm' | 'blocker-self' | 'blocker-other' | 'question';

export function classifyPause(task: Task): PauseKind {
  const pending = task.inputs.pending_blocker;
  if (pending) return pending.resolution === 'self' ? 'blocker-self' : 'blocker-other';
  const question = task.pause_reason ?? '';
  if ((question.includes('确认') && question.includes('提交')) || question.includes('即将提交')) return 'confirm';
  return 'question';
}

export function PauseCard({ task, pending, onAnswer, onTakeover }: {
  task: Task;
  pending: boolean;
  onAnswer: (text: string) => void;
  onTakeover: () => void;
}) {
  const kind = classifyPause(task);
  const question = task.pause_reason ?? '';
  const takeover: CardAction = { label: '我来接管', kind: 'secondary', onClick: onTakeover, disabled: pending };
  if (kind === 'confirm') {
    return (
      <ActionCard kind="confirm" title="请确认后再提交" body={question} actions={[
        { label: '确认提交', kind: 'primary', disabled: pending, onClick: () => onAnswer('确认提交') },
        { label: '取消，不提交', kind: 'danger', disabled: pending, onClick: () => onAnswer('取消，不要提交') },
        takeover,
      ]} />
    );
  }
  if (kind === 'blocker-self') {
    return (
      <ActionCard kind="blocker" title="遇到前置事项" body={question} actions={[
        { label: '是，先去办', kind: 'primary', disabled: pending, onClick: () => onAnswer('是，先去办') },
        { label: '否，先结束', kind: 'text', disabled: pending, onClick: () => onAnswer('否') },
      ]} />
    );
  }
  if (kind === 'blocker-other') {
    return (
      <ActionCard kind="blocker" title="需要别人先处理" body={question} actions={[
        { label: '已处理，继续', kind: 'primary', disabled: pending, onClick: () => onAnswer('已处理，请继续') },
        { label: '先结束', kind: 'text', disabled: pending, onClick: () => onAnswer('取消') },
      ]} />
    );
  }
  return <ActionCard kind="question" title="助手有个问题" body={question} actions={[takeover]} />;
}

export function ResultCard({ task, onRetry }: { task: Task; onRetry: () => void }) {
  const summary = task.artifacts.summary ?? task.reply ?? '';
  if (task.status === 'completed' || task.status === 'submitted') {
    const extras = Object.entries(task.artifacts).filter(([key, value]) =>
      !key.startsWith('summary') && key !== 'tracking' && typeof value !== 'object');
    return (
      <ActionCard kind="result" title={task.status === 'submitted' ? '已提交，等待审批' : '已完成'} body={summary}>
        {extras.length > 0 && (
          <dl className="card-facts">
            {extras.map(([key, value]) => <div key={key}><dt>{key}</dt><dd>{String(value)}</dd></div>)}
          </dl>
        )}
        {task.status === 'submitted' && (
          <p className="card-note">我会定时回查审批状态，有结果时告诉你。也可以在下方点「立即回查」。</p>
        )}
      </ActionCard>
    );
  }
  if (task.status === 'failed') {
    return (
      <ActionCard kind="danger" title="办理未完成" body={task.pause_reason ?? '未知原因'} actions={[
        { label: '重试', kind: 'primary', onClick: onRetry },
      ]} />
    );
  }
  if (task.status === 'blocked') {
    return (
      <ActionCard kind="blocker" title="被前置事项拦住" body={`${task.pause_reason ?? ''}\n处理好之后点「继续执行」我再重试。`} />
    );
  }
  if (task.status === 'rejected') {
    return <ActionCard kind="danger" title="审批被驳回" body={task.pause_reason ?? ''} />;
  }
  return null;
}

export function TakeoverCard({ onDone }: { onDone: () => void }) {
  return (
    <ActionCard kind="info" title="你已接管浏览器" body="Agent 会在当前这一步做完后停下等你。直接在右侧页面里操作，完成后点「接管完成，继续」，Agent 会从页面当前状态接着做。" actions={[
      { label: '接管完成，继续', kind: 'primary', onClick: onDone },
    ]} />
  );
}

export function UserInputHint({ onTakeover, onDismiss }: { onTakeover: () => void; onDismiss: () => void }) {
  return (
    <ActionCard kind="info" title="页面正在由 Agent 操作" body="现在键盘输入会被拦住。如果你想自己操作，先点「我来接管」。" actions={[
      { label: '我来接管', kind: 'primary', onClick: onTakeover },
      { label: '知道了', kind: 'text', onClick: onDismiss },
    ]}>
      <span className="sr-only"><Hand size={12} /></span>
    </ActionCard>
  );
}