import { BadRequestException } from '@nestjs/common';
import { GeneratedImageType, StorageCore } from 'src/cores/storage.core';
import { BulkIdErrorReason, BulkIdResponseDto } from 'src/dtos/asset-ids.response.dto';
import { UploadFieldName } from 'src/dtos/asset-media.dto';
import { AuthDto } from 'src/dtos/auth.dto';
import { AssetFileEntity } from 'src/entities/asset-files.entity';
import { AssetFileType, AssetType, Permission } from 'src/enum';
import { AuthRequest } from 'src/middleware/auth.guard';
import { AccessRepository } from 'src/repositories/access.repository';
import { AssetRepository } from 'src/repositories/asset.repository';
import { EventRepository } from 'src/repositories/event.repository';
import { PartnerRepository } from 'src/repositories/partner.repository';
import { IBulkAsset, ImmichFile, UploadFile } from 'src/types';
import { checkAccess } from 'src/utils/access';

export const getAssetFile = <T extends { type: AssetFileType }>(
  files: T[],
  type: AssetFileType | GeneratedImageType,
) => {
  return (files || []).find((file) => file.type === type);
};

export const getAssetFiles = (files: AssetFileEntity[]) => ({
  fullsizeFile: getAssetFile(files, AssetFileType.FULLSIZE),
  previewFile: getAssetFile(files, AssetFileType.PREVIEW),
  thumbnailFile: getAssetFile(files, AssetFileType.THUMBNAIL),
});

export const addAssets = async (
  auth: AuthDto,
  repositories: { access: AccessRepository; bulk: IBulkAsset },
  dto: { parentId: string; assetIds: string[] },
) => {
  const { access, bulk } = repositories;
  const existingAssetIds = await bulk.getAssetIds(dto.parentId, dto.assetIds);
  const notPresentAssetIds = dto.assetIds.filter((id) => !existingAssetIds.has(id));
  const allowedAssetIds = await checkAccess(access, {
    auth,
    permission: Permission.ASSET_SHARE,
    ids: notPresentAssetIds,
  });

  const results: BulkIdResponseDto[] = [];
  for (const assetId of dto.assetIds) {
    const hasAsset = existingAssetIds.has(assetId);
    if (hasAsset) {
      results.push({ id: assetId, success: false, error: BulkIdErrorReason.DUPLICATE });
      continue;
    }

    const hasAccess = allowedAssetIds.has(assetId);
    if (!hasAccess) {
      results.push({ id: assetId, success: false, error: BulkIdErrorReason.NO_PERMISSION });
      continue;
    }

    existingAssetIds.add(assetId);
    results.push({ id: assetId, success: true });
  }

  const newAssetIds = results.filter(({ success }) => success).map(({ id }) => id);
  if (newAssetIds.length > 0) {
    await bulk.addAssetIds(dto.parentId, newAssetIds);
  }

  return results;
};

export const removeAssets = async (
  auth: AuthDto,
  repositories: { access: AccessRepository; bulk: IBulkAsset },
  dto: { parentId: string; assetIds: string[]; canAlwaysRemove: Permission },
) => {
  const { access, bulk } = repositories;

  // check if the user can always remove from the parent album, memory, etc.
  const canAlwaysRemove = await checkAccess(access, { auth, permission: dto.canAlwaysRemove, ids: [dto.parentId] });
  const existingAssetIds = await bulk.getAssetIds(dto.parentId, dto.assetIds);
  const allowedAssetIds = canAlwaysRemove.has(dto.parentId)
    ? existingAssetIds
    : await checkAccess(access, { auth, permission: Permission.ASSET_SHARE, ids: existingAssetIds });

  const results: BulkIdResponseDto[] = [];
  for (const assetId of dto.assetIds) {
    const hasAsset = existingAssetIds.has(assetId);
    if (!hasAsset) {
      results.push({ id: assetId, success: false, error: BulkIdErrorReason.NOT_FOUND });
      continue;
    }

    const hasAccess = allowedAssetIds.has(assetId);
    if (!hasAccess) {
      results.push({ id: assetId, success: false, error: BulkIdErrorReason.NO_PERMISSION });
      continue;
    }

    existingAssetIds.delete(assetId);
    results.push({ id: assetId, success: true });
  }

  const removedIds = results.filter(({ success }) => success).map(({ id }) => id);
  if (removedIds.length > 0) {
    await bulk.removeAssetIds(dto.parentId, removedIds);
  }

  return results;
};

export type PartnerIdOptions = {
  userId: string;
  repository: PartnerRepository;
  /** only include partners with `inTimeline: true` */
  timelineEnabled?: boolean;
};
export const getMyPartnerIds = async ({ userId, repository, timelineEnabled }: PartnerIdOptions) => {
  const partnerIds = new Set<string>();
  const partners = await repository.getAll(userId);
  for (const partner of partners) {
    // ignore deleted users
    if (!partner.sharedBy || !partner.sharedWith) {
      continue;
    }

    // wrong direction
    if (partner.sharedWithId !== userId) {
      continue;
    }

    if (timelineEnabled && !partner.inTimeline) {
      continue;
    }

    partnerIds.add(partner.sharedById);
  }

  return [...partnerIds];
};

export type AssetHookRepositories = { asset: AssetRepository; event: EventRepository };

export const onBeforeLink = async (
  { asset: assetRepository, event: eventRepository }: AssetHookRepositories,
  { userId, livePhotoVideoId }: { userId: string; livePhotoVideoId: string },
) => {
  const motionAsset = await assetRepository.getById(livePhotoVideoId);
  if (!motionAsset) {
    throw new BadRequestException('Live photo video not found');
  }
  if (motionAsset.type !== AssetType.VIDEO) {
    throw new BadRequestException('Live photo video must be a video');
  }
  if (motionAsset.ownerId !== userId) {
    throw new BadRequestException('Live photo video does not belong to the user');
  }

  if (motionAsset?.isVisible) {
    await assetRepository.update({ id: livePhotoVideoId, isVisible: false });
    await eventRepository.emit('asset.hide', { assetId: motionAsset.id, userId });
  }
};

export const onBeforeUnlink = async (
  { asset: assetRepository }: AssetHookRepositories,
  { livePhotoVideoId }: { livePhotoVideoId: string },
) => {
  const motion = await assetRepository.getById(livePhotoVideoId);
  if (!motion) {
    return null;
  }

  if (StorageCore.isAndroidMotionPath(motion.originalPath)) {
    throw new BadRequestException('Cannot unlink Android motion photos');
  }

  return motion;
};

export const onAfterUnlink = async (
  { asset: assetRepository, event: eventRepository }: AssetHookRepositories,
  { userId, livePhotoVideoId }: { userId: string; livePhotoVideoId: string },
) => {
  await assetRepository.update({ id: livePhotoVideoId, isVisible: true });
  await eventRepository.emit('asset.show', { assetId: livePhotoVideoId, userId });
};

export function mapToUploadFile(file: ImmichFile): UploadFile {
  return {
    uuid: file.uuid,
    checksum: file.checksum,
    originalPath: file.path,
    originalName: Buffer.from(file.originalname, 'latin1').toString('utf8'),
    size: file.size,
  };
}

export const asRequest = (request: AuthRequest, file: Express.Multer.File) => {
  return {
    auth: request.user || null,
    fieldName: file.fieldname as UploadFieldName,
    file: mapToUploadFile(file as ImmichFile),
  };
};
