import { ArrowUp, Camera, ImagePlus, Loader2, Plus } from 'lucide-react';
import { type ChangeEvent, useRef, useState } from 'react';

import {
  canUseNativeHostCapability,
  captureHostImageFile,
  type HostFileImportImageResult,
  importHostImageFile,
} from '../../services/host-bridge/hostBridge';
import {
  puzzleReferenceImageDataUrlToFile,
  readPuzzleReferenceImageAsDataUrl,
} from '../../services/puzzleReferenceImage';
import { PlatformIconButton } from '../common/PlatformIconButton';
import { PlatformStatusMessage } from '../common/PlatformStatusMessage';
import { PlatformSubpanel } from '../common/PlatformSubpanel';
import { PlatformTextField } from '../common/PlatformTextField';
import { PlatformUploadPreviewCard } from '../common/PlatformUploadPreviewCard';

export type CreativeAgentComposerImage = {
  imageUrl: string;
  thumbnailUrl: string;
  label: string;
};

type CreativeAgentInputComposerProps = {
  isBusy: boolean;
  variant?: 'panel' | 'floating';
  placeholder?: string;
  onSubmit: (payload: {
    text: string;
    image: CreativeAgentComposerImage | null;
  }) => void;
};

export function CreativeAgentInputComposer({
  isBusy,
  variant = 'panel',
  placeholder = '想做成什么拼图？',
  onSubmit,
}: CreativeAgentInputComposerProps) {
  const [text, setText] = useState('');
  const [image, setImage] = useState<CreativeAgentComposerImage | null>(null);
  const [imageError, setImageError] = useState<string | null>(null);
  const imageInputRef = useRef<HTMLInputElement | null>(null);
  const canImportHostImage = canUseNativeHostCapability('file.importImage');
  const canCaptureHostImage = canUseNativeHostCapability('file.captureImage');
  const canSubmit = !isBusy && Boolean(text.trim() || image);

  const hostImageImportResultToFile = (result: HostFileImportImageResult) =>
    puzzleReferenceImageDataUrlToFile(
      `data:${result.mimeType};base64,${result.base64Data}`,
      result.fileName,
    );

  const setReferenceImageFromFile = async (file: File) => {
    try {
      const dataUrl = await readPuzzleReferenceImageAsDataUrl(file);
      setImage({
        imageUrl: dataUrl,
        thumbnailUrl: dataUrl,
        label: file.name.trim() || '参考图',
      });
      setImageError(null);
    } catch (error) {
      setImageError(
        error instanceof Error ? error.message : '参考图读取失败，请重试。',
      );
    }
  };

  const handleImageChange = async (event: ChangeEvent<HTMLInputElement>) => {
    const file = event.target.files?.[0];
    event.currentTarget.value = '';
    if (!file) {
      return;
    }

    await setReferenceImageFromFile(file);
  };

  const openReferenceImagePicker = () => {
    if (isBusy) {
      return;
    }

    if (!canImportHostImage) {
      imageInputRef.current?.click();
      return;
    }

    void (async () => {
      const importedImageFile = await importHostImageFile();
      if (!importedImageFile) {
        return;
      }

      await setReferenceImageFromFile(
        hostImageImportResultToFile(importedImageFile),
      );
    })();
  };

  const captureReferenceImage = () => {
    if (isBusy || !canCaptureHostImage) {
      return;
    }

    void (async () => {
      const capturedImageFile = await captureHostImageFile();
      if (!capturedImageFile) {
        return;
      }

      await setReferenceImageFromFile(
        hostImageImportResultToFile(capturedImageFile),
      );
    })();
  };

  const submit = () => {
    if (!canSubmit) {
      return;
    }
    onSubmit({
      text: text.trim(),
      image,
    });
    setText('');
    setImage(null);
    setImageError(null);
  };

  const floating = variant === 'floating';

  const composerContent = (
    <>
      <div className="flex items-end gap-2">
        <PlatformIconButton
          className={`h-11 w-11 shrink-0 ${floating ? 'creative-agent-composer__media-button' : ''} ${isBusy ? 'cursor-not-allowed opacity-55' : 'cursor-pointer'}`}
          label={image ? '更换参考图' : '添加参考图'}
          title={image ? '更换参考图' : '添加参考图'}
          disabled={isBusy}
          onClick={openReferenceImagePicker}
          icon={
            <>
              {floating ? (
                <Plus className="h-5 w-5" />
              ) : (
                <ImagePlus className="h-4 w-4" />
              )}
              <input
                ref={imageInputRef}
                type="file"
                accept="image/png,image/jpeg,image/webp"
                disabled={isBusy}
                aria-label={image ? '更换参考图' : '添加参考图'}
                onChange={(event) => {
                  void handleImageChange(event);
                }}
                className="hidden"
              />
            </>
          }
        />
        {canCaptureHostImage ? (
          <PlatformIconButton
            className={`h-11 w-11 shrink-0 ${floating ? 'creative-agent-composer__media-button' : ''}`}
            label={image ? '重新拍摄参考图' : '拍摄参考图'}
            title={image ? '重新拍摄参考图' : '拍摄参考图'}
            disabled={isBusy}
            onClick={captureReferenceImage}
            icon={<Camera className="h-4 w-4" />}
          />
        ) : null}

        <PlatformTextField
          variant="textarea"
          value={text}
          disabled={isBusy}
          rows={2}
          size="xs"
          density="roomy"
          onChange={(event) => setText(event.target.value)}
          onKeyDown={(event) => {
            if (event.key === 'Enter' && (event.metaKey || event.ctrlKey)) {
              event.preventDefault();
              submit();
            }
          }}
          className="min-h-11 flex-1"
          placeholder={placeholder}
          aria-label="智能创作输入"
        />

        <PlatformIconButton
          disabled={!canSubmit}
          onClick={submit}
          className="h-11 w-11 shrink-0"
          label="发送"
          title="发送"
          icon={
            isBusy ? (
              <Loader2 className="h-4 w-4 animate-spin" />
            ) : (
              <ArrowUp className="h-4 w-4" />
            )
          }
        />
      </div>

      {image ? (
        <PlatformUploadPreviewCard
          layout="inline"
          imageSrc={image.thumbnailUrl}
          imageAlt="创作参考图"
          caption={image.label}
          removeLabel="移除参考图"
          disabled={isBusy}
          onRemove={() => setImage(null)}
          className="mt-3"
          removeButtonProps={{ title: '移除参考图' }}
        />
      ) : null}

      {imageError ? (
        <PlatformStatusMessage
          tone="error"
          surface="profile"
          size="xs"
          className="mt-2"
        >
          {imageError}
        </PlatformStatusMessage>
      ) : null}
    </>
  );

  if (!floating) {
    return (
      <PlatformSubpanel
        padding="sm"
        radius="lg"
        className="creative-agent-composer sm:p-4"
      >
        {composerContent}
      </PlatformSubpanel>
    );
  }

  return (
    <section className="creative-agent-composer creative-agent-composer--floating">
      {composerContent}
    </section>
  );
}