import {
  Injectable,
  NotFoundException,
  UnauthorizedException,
} from '@nestjs/common';
import omit from 'lodash.omit';
import pick from 'lodash.pick';
import { BuildingService } from 'src/objects/building/building.service';
import { Room } from 'src/objects/building/entities/room.entity';
import { StoredItemTransaction } from 'src/objects/storage/entities/item-transaction.entity';
import { Item } from 'src/objects/storage/entities/item.entity';
import { StorageSet } from 'src/objects/storage/entities/storage-set.entity';
import { Storage } from 'src/objects/storage/entities/storage.entity';
import { StoredItem } from 'src/objects/storage/entities/stored-item.entity';
import { TransactionType } from 'src/objects/storage/enums/transaction-type.enum';
import { StorageService } from 'src/objects/storage/storage.service';
import { User } from 'src/objects/user/user.entity';
import {
  StorageAddExistingItemRequestDto,
  StorageAddItemRequestDto,
  StorageItemUpdateRequestDto,
  StorageStoredItemRequestDto,
  StorageStoredItemTransactionRequestDto,
  StorageStoredItemTransactionUpdateRequestDto,
  StorageStoredItemUpdateRequestDto,
} from './dto/storage-add-item-request.dto';
import { StorageItemRequestQueryDto } from './dto/storage-item-request.dto';
import {
  StorageItemResponseDto,
  StorageItemSearchResponseDto,
  StorageStoredItemResponseDto,
  StorageTransactionResponseDto,
  StorageTransactionWithActorResponseDto,
} from './dto/storage-item-response.dto';
import {
  StorageCreateRequestDto,
  StorageUpdateRequestDto,
} from './dto/storage-request.dto';
import {
  StorageActorResponse,
  StorageResponseDto,
  StorageResponseWithItemCountDto,
} from './dto/storage-response.dto';
import {
  StorageSetCreateRequestDto,
  StorageSetUpdateRequestDto,
} from './dto/storage-set-request.dto';
import { StorageSetResponseDto } from './dto/storage-set-response.dto';

@Injectable()
export class AppStorageService {
  constructor(
    private readonly buildingService: BuildingService,
    private readonly storageService: StorageService,
  ) {}

  async getStoragesInRoom(roomId: number, includeWithSets = false) {
    const storages = await this.storageService.getStoragesInRoom(
      roomId,
      includeWithSets,
    );
    return storages.map((storage) => this.formatStorageNoItems(storage));
  }

  async getStorageSetsInRoom(roomId: number) {
    const sets = await this.storageService.getStorageSetsInRoom(roomId);
    return sets.map((set) => this.formatStorageSetNoItems(set));
  }

  async createStorage(user: User, room: Room, body: StorageCreateRequestDto) {
    // TODO: validate color and location
    const newStorage = await this.storageService.saveStorage({
      ...body,
      addedBy: user,
      room,
    });

    return this.formatStorageNoItems(newStorage);
  }

  async createStorageSet(
    user: User,
    room: Room,
    body: StorageSetCreateRequestDto,
  ) {
    // TODO: validate color and location
    const newStorageSet = await this.storageService.saveStorageSet({
      ...body,
      addedBy: user,
      room,
    });

    return this.formatStorageSetNoItems(newStorageSet);
  }

  async updateStorage(storage: Storage, body: StorageUpdateRequestDto) {
    Object.assign(storage, body);
    await this.storageService.saveStorage(storage);
    return this.formatStorageNoItems(storage);
  }

  async updateStorageSet(
    storageSet: StorageSet,
    body: StorageSetUpdateRequestDto,
  ) {
    Object.assign(storageSet, body);
    await this.storageService.saveStorageSet(storageSet);
    return this.formatStorageSetNoItems(storageSet);
  }

  async moveStorage(set: StorageSet, storage: Storage) {
    storage.set = set;

    await this.storageService.saveStorage(storage);

    set.storages = [...(set.storages || []), storage];

    return this.formatStorageSetNoItems(set);
  }

  async removeFromSet(set: StorageSet, storage: Storage) {
    storage.set = null;
    await this.storageService.saveStorage(storage);
    set.storages = (set.storages || []).filter(
      (entry) => entry.id !== storage.id,
    );
    return this.formatStorageSetNoItems(set);
  }

  async searchForItems(user: User, query: StorageItemRequestQueryDto) {
    let responses: StorageItemSearchResponseDto[];
    if (query.searchTerm) {
      responses = await this.storageService.searchForItem(
        query.searchTerm,
        user.sub,
      );
    } else {
      responses = await this.storageService.searchForItemByBarcode(
        query.barcode,
        user.sub,
      );
    }
    return responses;
  }

  async getExpiringOrExpiredItemsInBuilding(buildingId: number) {
    const expiringSoon =
      await this.storageService.getExpiredOrExpiringSoonInBuilding(buildingId);
    return expiringSoon.map((storedItem) =>
      this.formatStoredItem(storedItem, true),
    );
  }

  async getExpiringOrExpiredItems(user: User) {
    const expiringSoon =
      await this.storageService.getExpiredOrExpiringSoonForSub(user.sub);
    return expiringSoon.map((storedItem) =>
      this.formatStoredItem(storedItem, true),
    );
  }

  async createStoredItem(
    user: User,
    item: Item,
    storage: Storage,
    transactionInfo: StorageStoredItemTransactionRequestDto,
    additionalInfo?: StorageStoredItemRequestDto,
  ) {
    const building = await this.buildingService.getStorageBuilding(storage.id);
    if (!building)
      throw new NotFoundException('Building for storage was not found');
    // Create stored item
    let storedItem = new StoredItem();
    storedItem.addedBy = user;
    storedItem.item = item;
    storedItem.storage = storage;
    storedItem.building = building;
    additionalInfo && Object.assign(storedItem, additionalInfo);

    storedItem = await this.storageService.saveStoredItem(storedItem);

    // Create transaction
    let transaction = new StoredItemTransaction();
    transaction.actor = user;
    transaction.storedItem = storedItem;
    Object.assign(transaction, transactionInfo);

    transaction = await this.storageService.saveStoredItemTransaction(
      transaction,
    );

    storedItem.transactions = [transaction];

    return new StorageStoredItemResponseDto(this.formatStoredItem(storedItem));
  }

  async createNewItem(
    user: User,
    storage: Storage,
    body: StorageAddItemRequestDto,
  ) {
    // Create item
    let item = new Item();
    item.addedBy = user;
    Object.assign(
      item,
      pick(body, [
        'displayName',
        'type',
        'barcode',
        'consumable',
        'image',
        'weight',
        'url',
        'notes',
        'public',
      ]),
    );

    item = await this.storageService.saveItem(item);

    return this.createStoredItem(
      user,
      item,
      storage,
      body.transactionInfo,
      body.additionalInfo,
    );
  }

  async addExistingItemToStorage(
    user: User,
    storage: Storage,
    itemId: number,
    body: StorageAddExistingItemRequestDto,
  ) {
    const item = await this.storageService.getItemByIdBySub(itemId, user.sub);
    if (!item) {
      throw new NotFoundException('Item not found');
    }

    return this.createStoredItem(
      user,
      item,
      storage,
      body.transactionInfo,
      body.additionalInfo,
    );
  }

  async updateOwnedItem(
    user: User,
    itemId: number,
    body: StorageItemUpdateRequestDto,
  ) {
    const item = await this.storageService.getItemByIdOwnedBySub(
      itemId,
      user.sub,
    );
    if (!item) {
      throw new NotFoundException('Item not found');
    }

    Object.assign(item, body);

    await this.storageService.saveItem(item);

    return this.formatItem(item);
  }

  async updateStoredItemDetails(
    storage: Storage,
    storedItemId: number,
    body: StorageStoredItemUpdateRequestDto,
  ) {
    const storedItem = await this.storageService.getStoredItemByStorageAndId(
      storage,
      storedItemId,
    );
    if (!storedItem) {
      throw new NotFoundException('Stored item not found');
    }

    Object.assign(storedItem, body);

    await this.storageService.saveStoredItem(storedItem);

    return this.formatStoredItem(storedItem);
  }

  async createStoredItemTransaction(
    user: User,
    storage: Storage,
    storedItemId: number,
    body: StorageStoredItemTransactionRequestDto,
  ) {
    const storedItem = await this.storageService.getStoredItemByStorageAndId(
      storage,
      storedItemId,
    );

    if (!storedItem) {
      throw new NotFoundException('Stored item not found');
    }

    const transaction = await this.storageService.saveStoredItemTransaction({
      ...body,
      actor: user,
      storedItem,
    });

    if (
      [
        TransactionType.SOLD,
        TransactionType.DESTROYED,
        TransactionType.BINNED,
      ].includes(body.type)
    ) {
      storedItem.consumedAt = new Date();
      await this.storageService.saveStoredItem(storedItem);
    }

    return this.formatTransaction(transaction);
  }

  async updateStoredItemTransaction(
    user: User,
    storedItemId: number,
    transactionId: number,
    body: StorageStoredItemTransactionUpdateRequestDto,
  ) {
    const storedItemTransaction =
      await this.storageService.getStoredItemTransactionById(
        storedItemId,
        transactionId,
        ['actor'],
      );

    if (!storedItemTransaction) {
      throw new NotFoundException('Stored item not found');
    }

    if (storedItemTransaction.actor.sub === user.sub) {
      throw new UnauthorizedException(
        'You can only update your own transactions',
      );
    }

    Object.assign(storedItemTransaction, body);
    await this.storageService.saveStoredItemTransaction(storedItemTransaction);

    return this.formatTransactionWithActor(storedItemTransaction);
  }

  async getStoredItemTransaction(storage: Storage, storedItemId: number) {
    const storedItem = await this.storageService.getStoredItemByStorageAndId(
      storage,
      storedItemId,
      ['transactions', 'transactions.actor'],
    );

    if (!storedItem) {
      throw new NotFoundException('Stored item not found');
    }

    return storedItem.transactions.map((transaction) =>
      this.formatTransactionWithActor(transaction),
    );
  }

  async getStoredItemDetails(storage: Storage, storedItemId: number) {
    const storedItem = await this.storageService.getStoredItemByStorageAndId(
      storage,
      storedItemId,
      ['item', 'addedBy'],
    );
    if (!storedItem) {
      throw new NotFoundException('Stored item not found');
    }

    return this.formatStoredItem(storedItem);
  }

  async getStorageWithItems(storage: Storage) {
    const withItemCount = await this.storageService.getStorageWithItemCount(
      storage.id,
    );

    return this.formatStorageNoItems(
      withItemCount,
    ) as StorageResponseWithItemCountDto;
  }

  private formatActor(input: User): StorageActorResponse {
    return pick(input, ['name', 'sub', 'picture', 'color']);
  }

  private formatStorageNoItems(storage: Storage): StorageResponseDto {
    return {
      ...omit(storage, ['room', 'items']),
      addedBy: storage.addedBy && this.formatActor(storage.addedBy),
    };
  }

  private formatStorageWithItems(storage: Storage): StorageResponseDto {
    return {
      ...omit(storage, ['room', 'set']),
      items: !!storage.items?.length
        ? storage.items.map((item) => this.formatStoredItem(item))
        : null,
      addedBy: storage.addedBy && this.formatActor(storage.addedBy),
    };
  }

  private formatItem(item: Item): StorageItemResponseDto {
    return {
      ...omit(item, ['instances', 'addedBy']),
      addedBy: item.addedBy && this.formatActor(item.addedBy),
    };
  }

  private formatTransaction(
    transaction: StoredItemTransaction,
  ): StorageTransactionResponseDto {
    return omit(transaction, ['storedItem', 'actor']);
  }

  private formatTransactionWithActor(
    transaction: StoredItemTransaction,
  ): StorageTransactionWithActorResponseDto {
    return {
      ...omit(transaction, ['storedItem']),
      actor: transaction.actor && this.formatActor(transaction.actor),
    };
  }

  private formatStoredItem(
    storedItem: StoredItem,
    fullSet = false,
  ): StorageStoredItemResponseDto {
    return {
      ...(fullSet ? storedItem : omit(storedItem, ['storage', 'building'])),
      transactions: !!storedItem.transactions?.length
        ? storedItem.transactions.map((transaction) =>
            this.formatTransaction(transaction),
          )
        : null,
      item: storedItem.item ? this.formatItem(storedItem.item) : null,
      addedBy: storedItem.addedBy ? this.formatActor(storedItem.addedBy) : null,
    };
  }

  formatStorageSetNoItems(set: StorageSet): StorageSetResponseDto {
    return {
      ...omit(set, ['room']),
      addedBy: set.addedBy && this.formatActor(set.addedBy),
      storages: set.storages?.length
        ? set.storages.map((storage) => this.formatStorageNoItems(storage))
        : [],
    };
  }
}