import { autoResizeElementsCommand } from '@blocksuite/affine-block-surface';
import { toast } from '@blocksuite/affine-components/toast';
import {
  type AttachmentBlockProps,
  type ImageBlockModel,
  type ImageBlockProps,
  ImageBlockSchema,
} from '@blocksuite/affine-model';
import {
  FileSizeLimitProvider,
  NativeClipboardProvider,
} from '@blocksuite/affine-shared/services';
import {
  convertToPng,
  formatSize,
  getBlockProps,
  isInsidePageEditor,
  readImageSize,
  transformModel,
  withTempBlobData,
} from '@blocksuite/affine-shared/utils';
import { Bound, type IVec, Vec } from '@blocksuite/global/gfx';
import { BlockSelection, type BlockStdScope } from '@blocksuite/std';
import { GfxControllerIdentifier } from '@blocksuite/std/gfx';
import type { BlockModel } from '@blocksuite/store';

import {
  SURFACE_IMAGE_CARD_HEIGHT,
  SURFACE_IMAGE_CARD_WIDTH,
} from './components/image-block-fallback';
import type { ImageBlockComponent } from './image-block';
import type { ImageEdgelessBlockComponent } from './image-edgeless-block';

const DEFAULT_ATTACHMENT_NAME = 'affine-attachment';

async function getImageBlob(model: ImageBlockModel) {
  const sourceId = model.props.sourceId$.peek();
  if (!sourceId) return null;

  const doc = model.store;
  let blob = await doc.blobSync.get(sourceId);
  if (!blob) return null;

  if (!blob.type) {
    const buffer = await blob.arrayBuffer();
    const FileType = await import('file-type');
    const fileType = await FileType.fileTypeFromBuffer(buffer);

    blob = new Blob([buffer], { type: fileType?.mime });
  }

  if (!blob.type.startsWith('image/')) return null;

  return blob;
}

export async function refreshData(
  block: ImageBlockComponent | ImageEdgelessBlockComponent
) {
  await block.resourceController.refreshUrlWith();
}

export async function downloadImageBlob(
  block: ImageBlockComponent | ImageEdgelessBlockComponent
) {
  const { host, blobUrl, resourceController } = block;

  if (!blobUrl) {
    toast(host, 'Failed to download image!');
    return;
  }

  if (resourceController.state$.peek().downloading) {
    toast(host, 'Download in progress...');
    return;
  }

  resourceController.updateState({ downloading: true });

  toast(host, 'Downloading image...');

  const tmpLink = document.createElement('a');
  const event = new MouseEvent('click');
  tmpLink.download = 'image';
  tmpLink.href = blobUrl;
  tmpLink.dispatchEvent(event);
  tmpLink.remove();

  resourceController.updateState({ downloading: false });
}

export async function resetImageSize(
  block: ImageBlockComponent | ImageEdgelessBlockComponent
) {
  const { model } = block;

  const blob = await getImageBlob(model);
  if (!blob) {
    console.error('Failed to get image blob');
    return;
  }

  const imageSize = await readImageSize(blob);

  const bound = model.elementBound;
  bound.w = imageSize.width;
  bound.h = imageSize.height;

  const xywh = bound.serialize();
  const props: Partial<ImageBlockProps> = { ...imageSize, xywh };

  block.store.updateBlock(model, props);
}

export async function copyImageBlob(
  block: ImageBlockComponent | ImageEdgelessBlockComponent
) {
  const { host, model, std } = block;
  let blob = await getImageBlob(model);
  if (!blob) {
    console.error('Failed to get image blob');
    return;
  }

  let copied = false;

  try {
    // Copies the image as PNG in Electron.
    const copyAsPNG = std.getOptional(NativeClipboardProvider)?.copyAsPNG;
    if (copyAsPNG) {
      copied = await copyAsPNG(await blob.arrayBuffer());
    }

    // The current clipboard only supports the `image/png` image format.
    // The `ClipboardItem.supports('image/svg+xml')` is not currently used,
    // because when pasting, the content is not read correctly.
    //
    // https://developer.mozilla.org/en-US/docs/Web/API/ClipboardItem
    // https://alexharri.com/blog/clipboard
    if (!copied) {
      if (blob.type !== 'image/png') {
        blob = await convertToPng(blob);
        if (!blob) {
          console.error('Failed to convert blob to PNG');
          return;
        }
      }

      if (!globalThis.isSecureContext) {
        console.error(
          'Clipboard API is not available in insecure context',
          blob.type,
          blob
        );
        return;
      }

      await navigator.clipboard.write([
        new ClipboardItem({ [blob.type]: blob }),
      ]);
    }

    toast(host, 'Copied image to clipboard');
  } catch (error) {
    console.error(error);
  }
}

/**
 * Turn the image block into a attachment block.
 */
export async function turnImageIntoCardView(
  block: ImageBlockComponent | ImageEdgelessBlockComponent
) {
  const doc = block.store;
  if (!doc.schema.flavourSchemaMap.has('affine:attachment')) {
    console.error('The attachment flavour is not supported!');
    return;
  }

  const model = block.model;
  const sourceId = model.props.sourceId$.peek();
  const blob = await getImageBlob(model);
  if (!sourceId || !blob) {
    console.error('Image data not available');
    return;
  }

  const { saveImageData, getAttachmentData } = withTempBlobData();
  saveImageData(sourceId, {
    width: model.props.width,
    height: model.props.height,
  });
  const attachmentConvertData = getAttachmentData(sourceId);
  const attachmentProp: Partial<AttachmentBlockProps> = {
    sourceId,
    name: DEFAULT_ATTACHMENT_NAME,
    size: blob.size,
    type: blob.type,
    caption: model.props.caption,
    ...attachmentConvertData,
  };
  transformModel(model, 'affine:attachment', attachmentProp);
}

export function shouldResizeImage(node: Node, target: EventTarget | null) {
  return !!(
    target &&
    target instanceof HTMLElement &&
    node.contains(target) &&
    target.classList.contains('resize')
  );
}

function hasExceeded(
  std: BlockStdScope,
  files: File[],
  maxFileSize = std.get(FileSizeLimitProvider).maxFileSize
) {
  const exceeded = files.some(file => file.size > maxFileSize);

  if (exceeded) {
    const size = formatSize(maxFileSize);
    toast(std.host, `You can only upload files less than ${size}`);
  }

  return exceeded;
}

async function buildPropsWith(std: BlockStdScope, file: File) {
  const { size } = file;
  const [imageSize, sourceId] = await Promise.all([
    readImageSize(file),
    std.store.blobSync.set(file),
  ]);

  if (!(imageSize.width * imageSize.height)) {
    toast(std.host, 'Failed to read image size, please try another image');
    throw new Error('Failed to read image size');
  }

  return { size, sourceId, ...imageSize } satisfies Partial<ImageBlockProps>;
}

export async function addSiblingImageBlocks(
  std: BlockStdScope,
  files: File[],
  targetModel: BlockModel,
  placement: 'after' | 'before' = 'after'
) {
  files = files.filter(file => file.type.startsWith('image/'));
  if (!files.length) return [];

  if (hasExceeded(std, files)) return [];

  const flavour = ImageBlockSchema.model.flavour;

  const propsArray = await Promise.all(
    files.map(file => buildPropsWith(std, file))
  );

  const blockIds = std.store.addSiblingBlocks(
    targetModel,
    propsArray.map(props => ({ ...props, flavour })),
    placement
  );

  return blockIds;
}

export async function addImageBlocks(
  std: BlockStdScope,
  files: File[],
  parent?: BlockModel | string | null,
  parentIndex?: number
) {
  files = files.filter(file => file.type.startsWith('image/'));
  if (!files.length) return [];

  if (hasExceeded(std, files)) return [];

  const flavour = ImageBlockSchema.model.flavour;

  const propsArray = await Promise.all(
    files.map(file => buildPropsWith(std, file))
  );

  const blocks = propsArray.map(blockProps => ({ flavour, blockProps }));

  const blockIds = std.store.addBlocks(blocks, parent, parentIndex);

  return blockIds;
}

export async function addImages(
  std: BlockStdScope,
  files: File[],
  options: {
    point?: IVec;
    maxWidth?: number;
    shouldTransformPoint?: boolean; // determines whether we should use `toModelCoord` to convert the point
  }
): Promise<string[]> {
  files = files.filter(file => file.type.startsWith('image/'));
  if (!files.length) return [];

  if (hasExceeded(std, files)) return [];

  const flavour = ImageBlockSchema.model.flavour;

  const propsArray = await Promise.all(
    files.map(file => buildPropsWith(std, file))
  );

  const gfx = std.get(GfxControllerIdentifier);
  const isMultiple = propsArray.length > 1;
  const inTopLeft = isMultiple;
  const gap = 32;
  const { point, maxWidth, shouldTransformPoint = true } = options;

  let { x, y } = gfx.viewport.center;
  if (point) {
    if (shouldTransformPoint) {
      [x, y] = gfx.viewport.toModelCoord(...point);
    } else {
      [x, y] = point;
    }
  }

  const xy = [x, y];

  const blocks = propsArray.map((props, i) => {
    // If maxWidth is provided, limit the width of the image to maxWidth
    // Otherwise, use the original width
    if (maxWidth) {
      const p = props.height / props.width;
      props.width = Math.min(props.width, maxWidth);
      props.height = props.width * p;
    }

    const center = Vec.addScalar(xy, i * gap);
    const index = gfx.layer.generateIndex();

    const { width, height } = props;
    const xywh = calcBoundByOrigin(
      center,
      inTopLeft,
      width,
      height
    ).serialize();

    return {
      flavour,
      blockProps: {
        ...props,
        width,
        height,
        xywh,
        index,
      },
    };
  });

  const blockIds = std.store.addBlocks(blocks, gfx.surface);

  gfx.selection.set({
    elements: blockIds,
    editing: false,
  });

  if (isMultiple) {
    std.command.exec(autoResizeElementsCommand);
  }

  return blockIds;
}

export function calcBoundByOrigin(
  point: IVec,
  inTopLeft = false,
  width = SURFACE_IMAGE_CARD_WIDTH,
  height = SURFACE_IMAGE_CARD_HEIGHT
) {
  return inTopLeft
    ? new Bound(point[0], point[1], width, height)
    : Bound.fromCenter(point, width, height);
}

export function duplicate(block: ImageBlockComponent) {
  const model = block.model;
  const blockProps = getBlockProps(model);
  const {
    width: _width,
    height: _height,
    xywh: _xywh,
    rotate: _rotate,
    zIndex: _zIndex,
    ...duplicateProps
  } = blockProps;

  const { store } = model;
  const parent = store.getParent(model);
  if (!parent) {
    console.error(`Parent not found for block(${model.flavour}) ${model.id}`);
    return;
  }

  const index = parent?.children.indexOf(model);
  const duplicateId = store.addBlock(
    model.flavour,
    duplicateProps,
    parent,
    index + 1
  );

  const editorHost = block.host;
  editorHost.updateComplete
    .then(() => {
      const { selection } = editorHost;
      selection.setGroup('note', [
        selection.create(BlockSelection, {
          blockId: duplicateId,
        }),
      ]);
      if (isInsidePageEditor(editorHost)) {
        const duplicateElement = editorHost.view.getBlock(duplicateId);
        if (duplicateElement) {
          duplicateElement.scrollIntoView(true);
        }
      }
    })
    .catch(console.error);
}