import { useState } from 'react';
import { Check, CircleHelp, LoaderCircle, X } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Textarea } from '@/components/ui/textarea';
import { respondCodingConversationInteraction } from '@/lib/coding-conversations';
import type {
  ConversationInteraction,
  ConversationInteractionResponse,
} from '@/types/coding-conversation';

export function CodingInteractionPanel({
  conversationId,
  interactions,
  onSettled,
}: {
  conversationId: string;
  interactions: ConversationInteraction[];
  onSettled?(): Promise<void> | void;
}) {
  const [values, setValues] = useState<Record<string, string>>({});
  const [busyId, setBusyId] = useState<string | null>(null);
  const [errors, setErrors] = useState<Record<string, string>>({});
  const pendingInteractions = interactions.filter(({ status }) => status === 'pending');

  if (pendingInteractions.length === 0) return null;

  const respond = (response: ConversationInteractionResponse) => {
    if (busyId) return;
    setBusyId(response.interactionId);
    setErrors((current) => {
      const next = { ...current };
      delete next[response.interactionId];
      return next;
    });
    void respondCodingConversationInteraction(conversationId, response)
      .then(() => onSettled?.())
      .catch((error) => {
        setErrors((current) => ({
          ...current,
          [response.interactionId]: `${error instanceof Error ? error.message : String(error)}。请求可能已失效，请刷新对话。`,
        }));
      })
      .finally(() => setBusyId((current) => current === response.interactionId ? null : current));
  };

  return (
    <section
      className="mx-auto w-[calc(100%_-_2rem)] max-w-[46rem] shrink-0 space-y-2 pt-2"
      aria-label="等待回答的 Agent 交互"
      data-testid="coding-interactions"
    >
      {pendingInteractions.map((interaction) => {
        const busy = busyId === interaction.id;
        const value = values[interaction.id] ?? '';
        return (
          <div key={interaction.id} className="rounded-lg border border-brand/20 bg-brand-soft/55 p-3 shadow-soft">
            <div className="flex items-start gap-2">
              <CircleHelp className="mt-0.5 h-4 w-4 shrink-0 text-brand" aria-hidden="true" />
              <div className="min-w-0 flex-1">
                <div className="flex gap-2">
                  <p className="min-w-0 flex-1 text-sm font-semibold">{interaction.title}</p>
                  <span className="text-xs text-muted-foreground">等待回答</span>
                </div>
                {interaction.message && <p className="mt-1 text-pretty text-xs leading-5 text-muted-foreground">{interaction.message}</p>}
              </div>
            </div>

            {interaction.kind === 'select' && (
              <div className="mt-3 space-y-2">
                <div className="flex flex-wrap gap-2">
                  {(interaction.options ?? []).map((option) => (
                    <Button
                      key={option.id}
                      type="button"
                      variant="outline"
                      className="h-auto min-h-9 rounded-lg px-3 py-2 text-left"
                      disabled={Boolean(busyId)}
                      title={option.description}
                      onClick={() => respond({ interactionId: interaction.id, optionId: option.id })}
                    >
                      {option.label}
                    </Button>
                  ))}
                </div>
                <form
                  className="flex items-center gap-2"
                  onSubmit={(event) => {
                    event.preventDefault();
                    const answer = value.trim();
                    if (answer) respond({ interactionId: interaction.id, value: answer });
                  }}
                >
                  <Input
                    value={value}
                    disabled={Boolean(busyId)}
                    aria-label={`${interaction.title}的其他回答`}
                    placeholder="输入其他回答"
                    className="rounded-lg bg-background"
                    onChange={(event) => setValues((current) => ({
                      ...current,
                      [interaction.id]: event.target.value,
                    }))}
                  />
                  <Button
                    type="submit"
                    className="min-h-9 shrink-0 rounded-lg"
                    disabled={Boolean(busyId) || !value.trim()}
                  >
                    提交回答
                  </Button>
                </form>
              </div>
            )}

            {interaction.kind === 'confirm' && (
              <div className="mt-3 flex flex-wrap gap-2">
                <Button type="button" className="min-h-9 rounded-lg" disabled={Boolean(busyId)} onClick={() => respond({ interactionId: interaction.id, confirmed: true })}>
                  <Check className="mr-1.5 h-4 w-4" aria-hidden="true" />确认
                </Button>
                <Button type="button" variant="outline" className="min-h-9 rounded-lg" disabled={Boolean(busyId)} onClick={() => respond({ interactionId: interaction.id, confirmed: false })}>
                  不确认
                </Button>
              </div>
            )}

            {(interaction.kind === 'input' || interaction.kind === 'editor') && (
              <div className="mt-3 space-y-2">
                {interaction.kind === 'editor'
                  ? (
                    <Textarea
                      value={value}
                      rows={5}
                      disabled={Boolean(busyId)}
                      aria-label={`${interaction.title}的回答`}
                      className="resize-y rounded-lg bg-background"
                      onChange={(event) => setValues((current) => ({ ...current, [interaction.id]: event.target.value }))}
                    />
                  )
                  : (
                    <Input
                      value={value}
                      disabled={Boolean(busyId)}
                      aria-label={`${interaction.title}的回答`}
                      className="rounded-lg bg-background"
                      onChange={(event) => setValues((current) => ({ ...current, [interaction.id]: event.target.value }))}
                    />
                  )}
                <Button type="button" className="min-h-9 rounded-lg" disabled={Boolean(busyId) || !value.trim()} onClick={() => respond({ interactionId: interaction.id, value })}>
                  提交回答
                </Button>
              </div>
            )}

            <div className="mt-2 flex items-center justify-between gap-2">
              <Button type="button" variant="ghost" className="min-h-9 rounded-lg px-3 text-muted-foreground" disabled={Boolean(busyId)} onClick={() => respond({ interactionId: interaction.id, cancelled: true })}>
                <X className="mr-1.5 h-4 w-4" aria-hidden="true" />取消请求
              </Button>
              {busy && <LoaderCircle className="h-4 w-4 animate-spin text-muted-foreground" aria-label="正在提交回答" />}
            </div>
            {errors[interaction.id] && <p className="mt-2 text-xs text-destructive" role="alert">{errors[interaction.id]}</p>}
          </div>
        );
      })}
    </section>
  );
}