import { LoaderCircle, Plus, RotateCcw, Send, X } from 'lucide-react';
import { useRef } from 'react';
import { Button } from '@/components/ui/button';
import { Textarea } from '@/components/ui/textarea';
import { cn } from '@/lib/utils';
import type { ConversationRunStatus } from '@/types/coding-conversation';

export interface CodingComposerProps {
  value: string;
  editable: boolean;
  canSend: boolean;
  preparing: boolean;
  recovering: boolean;
  runStatus: ConversationRunStatus;
  error: string | null;
  recoverableError: boolean;
  acceptedCount: number;
  attachments: Array<{ id: string; name: string; previewUrl: string }>;
  submitting: boolean;
  placeholder: string;
  onChange(value: string): void;
  onSubmit(): void;
  onRecover(): void;
  onAddFiles(files: File[]): void;
  onRemoveAttachment(id: string): void;
}

export function CodingComposer({
  value,
  editable,
  canSend,
  preparing,
  recovering,
  runStatus,
  error,
  recoverableError,
  acceptedCount,
  attachments,
  submitting,
  placeholder,
  onChange,
  onSubmit,
  onRecover,
  onAddFiles,
  onRemoveAttachment,
}: CodingComposerProps) {
  const fileInputRef = useRef<HTMLInputElement | null>(null);
  const running = ['queued', 'running', 'retrying', 'compacting', 'aborting'].includes(runStatus);
  return (
    <form
      data-testid="coding-message-composer"
      className="relative z-20 mx-auto w-[calc(100%_-_2rem)] max-w-[46rem] shrink-0 pb-4 pt-2 sm:pb-5 sm:pt-3"
      onSubmit={(event) => {
        event.preventDefault();
        if (canSend) onSubmit();
      }}
    >
      {(preparing || recovering || submitting || error || acceptedCount > 0 || running) && (
        <div className="mb-2 flex min-h-10 items-center gap-2 rounded-xl bg-surface-subtle px-3 py-2 text-xs text-muted-foreground shadow-[0_0_0_1px_rgba(0,0,0,0.05)]">
          {(preparing || recovering || submitting) && <LoaderCircle className="h-4 w-4 shrink-0 animate-spin" aria-hidden="true" />}
          <span className="min-w-0 flex-1 text-pretty" role={error ? 'alert' : 'status'}>
            {error
              ?? (recovering
                ? '正在重新连接本地 Agent…'
                : submitting
                  ? '正在准备图片并提交…'
                  : acceptedCount > 0
                    ? `${acceptedCount} 条消息已被本地 Agent 接收。`
                : preparing
                  ? '正在准备本地 Agent，输入框仍可编辑。'
                  : running
                    ? '当前对话正在处理。'
                    : '')}
          </span>
          {error && recoverableError && (
            <Button
              type="button"
              variant="ghost"
              className="min-h-10 shrink-0 rounded-xl px-3 transition-transform duration-150 ease-out active:scale-[0.96]"
              disabled={recovering}
              onClick={onRecover}
            >
              <RotateCcw className="mr-1.5 h-4 w-4" aria-hidden="true" />
              重试
            </Button>
          )}
        </div>
      )}
      <input
        ref={fileInputRef}
        type="file"
        accept="image/png,image/jpeg,image/webp,image/gif"
        multiple
        className="sr-only"
        data-testid="coding-file-attachment-input"
        onChange={(event) => {
          onAddFiles(Array.from(event.target.files ?? []));
          event.target.value = '';
        }}
      />
      <div className="chat-composer-surface rounded-2xl bg-background p-2 shadow-[0_0_0_1px_rgba(0,0,0,0.10),0_2px_8px_rgba(0,0,0,0.06)] focus-within:shadow-[0_0_0_1px_rgba(0,0,0,0.16),0_4px_14px_rgba(0,0,0,0.07)]">
        {attachments.length > 0 && (
          <div className="flex flex-wrap gap-2 px-1 pb-1" aria-label="已添加到本次消息的图片">
            {attachments.map((attachment) => (
              <div key={attachment.id} className="relative h-16 w-16 overflow-hidden rounded-xl bg-surface-subtle shadow-[0_0_0_1px_rgba(0,0,0,0.06)]">
                <img
                  src={attachment.previewUrl}
                  alt={attachment.name}
                  className="h-full w-full object-cover outline outline-1 -outline-offset-1 outline-black/10"
                />
                <button
                  type="button"
                  className="absolute right-1 top-1 flex h-10 w-10 translate-x-2 -translate-y-2 items-end justify-start rounded-full bg-foreground/85 p-1.5 text-background transition-[background-color,scale] duration-150 ease-out hover:bg-foreground active:scale-[0.96]"
                  aria-label={`移除图片 ${attachment.name}`}
                  onClick={() => onRemoveAttachment(attachment.id)}
                >
                  <X className="h-3.5 w-3.5" aria-hidden="true" />
                </button>
              </div>
            ))}
          </div>
        )}
        <Textarea
          value={value}
          rows={1}
          disabled={!editable}
          placeholder={placeholder}
          className="max-h-40 !min-h-[48px] resize-none border-0 bg-transparent px-2 py-2.5 text-sm leading-6 shadow-none placeholder:text-muted-foreground focus-visible:ring-0 focus-visible:ring-offset-0"
          onChange={(event) => onChange(event.target.value)}
          onKeyDown={(event) => {
            if (event.key !== 'Enter' || event.shiftKey || event.nativeEvent.isComposing) return;
            event.preventDefault();
            if (canSend) onSubmit();
          }}
          onPaste={(event) => {
            const files = Array.from(event.clipboardData.files).filter((file) => file.type.startsWith('image/'));
            if (files.length > 0) onAddFiles(files);
          }}
        />
        <div className="flex min-h-10 items-center justify-between gap-2 px-1">
          <div className="flex min-w-0 items-center gap-1">
            <Button
              type="button"
              variant="ghost"
              className="h-10 w-10 shrink-0 rounded-xl p-0 transition-transform duration-150 ease-out active:scale-[0.96]"
              disabled={!editable || submitting}
              aria-label="添加图片"
              onClick={() => fileInputRef.current?.click()}
            >
              <Plus className="h-4 w-4" aria-hidden="true" />
            </Button>
            <p className="min-w-0 truncate px-1 text-xs text-muted-foreground">
              {running ? '排队与引导发送将在下一阶段接入' : 'Enter 发送 · Shift + Enter 换行'}
            </p>
          </div>
          <Button
            type="submit"
            className={cn(
              'h-10 w-10 shrink-0 rounded-xl bg-foreground p-0 text-background shadow-soft hover:bg-foreground/90',
              'transition-transform duration-150 ease-out active:scale-[0.96]',
            )}
            disabled={!canSend}
            aria-label="发送"
          >
            {submitting
              ? <LoaderCircle className="h-4 w-4 animate-spin" aria-hidden="true" />
              : <Send className="h-4 w-4" aria-hidden="true" />}
          </Button>
        </div>
      </div>
    </form>
  );
}