import { Controller, Injectable, Get } from '@nestjs/common'
import { InjectRepository } from '@nestjs/typeorm'
import { FilterOperator, FilterSuffix, Paginate, PaginateQuery, paginate, Paginated } from 'nestjs-paginate'
import { Repository, Entity, PrimaryGeneratedColumn, Column } from 'typeorm'

@Entity()
export class CatEntity {
  @PrimaryGeneratedColumn()
  id: number

  @Column('text')
  name: string

  @Column('text')
  color: string

  @Column('int')
  age: number

  @Column({ nullable: true })
  lastVetVisit: Date | null

  @CreateDateColumn()
  createdAt: string
}

@Injectable()
export class CatsService {
  constructor(
    @InjectRepository(CatEntity)
    private readonly catsRepository: Repository<CatEntity>
  ) {}

  public findAll(query: PaginateQuery): Promise<Paginated<CatEntity>> {
    return paginate(query, this.catsRepository, {
      sortableColumns: ['id', 'name', 'color', 'age'],
      nullSort: 'last',
      defaultSortBy: [['id', 'DESC']],
      searchableColumns: ['name', 'color', 'age'],
      select: ['id', 'name', 'color', 'age', 'lastVetVisit'],
      filterableColumns: {
        name: [FilterOperator.EQ, FilterSuffix.NOT],
        age: true,
      },
    })
  }
}

@Controller('cats')
export class CatsController {
  constructor(private readonly catsService: CatsService) {}

  @Get()
  public findAll(@Paginate() query: PaginateQuery): Promise<Paginated<CatEntity>> {
    return this.catsService.findAll(query)
  }
}

const paginateConfig: PaginateConfig<CatEntity> {
  /**
   * Required: true (must have a minimum of one column)
   * Type: (keyof CatEntity)[]
   * Description: These are the columns that are valid to be sorted by.
   */
  sortableColumns: ['id', 'name', 'color'],

  /**
   * Required: false
   * Type: 'first' | 'last'
   * Description: Define whether to put null values at the beginning
   * or end of the result set.
   */
  nullSort: 'last',

  /**
   * Required: false
   * Type: [keyof CatEntity, 'ASC' | 'DESC'][]
   * Default: [[sortableColumns[0], 'ASC]]
   * Description: The order to display the sorted entities.
   */
  defaultSortBy: [['name', 'DESC']],

  /**
   * Required: false
   * Type: (keyof CatEntity)[]
   * Description: These columns will be searched through when using the search query
   * param. Limit search scope further by using `searchBy` query param.
   */
  searchableColumns: ['name', 'color'],

  /**
   * Required: false
   * Type: (keyof CatEntity)[]
   * Default: None
   * Description: TypeORM partial selection. Limit selection further by using `select` query param.
   * https://typeorm.io/select-query-builder#partial-selection
   * Note: You must include the primary key in the selection.
   */
  select: ['id', 'name', 'color'],

  /**
   * Required: false
   * Type: number
   * Default: 100
   * Description: The maximum amount of entities to return per page.
   * Set it to 0, in conjunction with limit=0 on query param, to disable pagination.
   */
  maxLimit: 20,

  /**
   * Required: false
   * Type: number
   * Default: 20
   */
  defaultLimit: 50,

  /**
   * Required: false
   * Type: TypeORM find options
   * Default: None
   * https://typeorm.io/#/find-optionsfind-options.md
   */
  where: { color: 'ginger' },

  /**
   * Required: false
   * Type: { [key in CatEntity]?: FilterOperator[] } - Operators based on TypeORM find operators
   * Default: None
   * https://typeorm.io/#/find-options/advanced-options
   */
  filterableColumns: { age: [FilterOperator.EQ, FilterOperator.IN] },

  /**
   * Required: false
   * Type: RelationColumn<CatEntity>
   * Description: Indicates what relations of entity should be loaded.
   */
  relations: [],

  /**
   * Required: false
   * Type: boolean
   * Default: false
   * Description: Load eager relations using TypeORM's eager property.
   * Only works if `relations` is not defined.
   */
  loadEagerRelations: true,

  /**
   * Required: false
   * Type: boolean
   * Description: Disables the global condition of "non-deleted" for the entity with delete date columns.
   * https://typeorm.io/select-query-builder#querying-deleted-rows
   */
  withDeleted: false,

  /**
   * Required: false
   * Type: string
   * Description: Allow user to choose between limit/offset and take/skip.
   * Default: PaginationType.TAKE_AND_SKIP
   *
   * However, using limit/offset can cause problems with relations.
   */
  paginationType: PaginationType.LIMIT_AND_OFFSET,

  /**
   * Required: false
   * Type: boolean
   * Default: false
   * Description: Generate relative paths in the resource links.
   */
  relativePath: true,

  /**
   * Required: false
   * Type: string
   * Description: Overrides the origin of absolute resource links if set.
   */
  origin: 'http://cats.example',
}

const queryBuilder = repo
  .createQueryBuilder('cats')
  .leftJoinAndSelect('cats.owner', 'owner')
  .where('cats.owner = :ownerId', { ownerId })

const result = await paginate<CatEntity>(query, queryBuilder, config)

const config: PaginateConfig<CatEntity> = {
  relations: ['toys'],
  sortableColumns: ['id', 'name', 'toys.name'],
  filterableColumns: {
    'toys.name': [FilterOperator.IN],
  },
}

const result = await paginate<CatEntity>(query, catRepo, config)

const config: PaginateConfig<CatEntity> = {
  sortableColumns: ['id', 'name', 'toys.(size.height)', 'toys.(size.width)'],
  searchableColumns: ['name'],
  relations: ['toys'],
}

const config: PaginateConfig<CatEntity> = {
  relations: { home: { pillows: true } },
  sortableColumns: ['id', 'name', 'home.pillows.color'],
  searchableColumns: ['name', 'home.pillows.color'],
  filterableColumns: {
    'home.pillows.color': [FilterOperator.EQ],
  },
}

const result = await paginate<CatEntity>(query, catRepo, config)

@Entity()
export class CatEntity {
  // ...

  @OneToMany(() => CatToyEntity, (catToy) => catToy.cat, {
    eager: true,
  })
  toys: CatToyEntity[]
}

const config: PaginateConfig<CatEntity> = {
  loadEagerRelations: true,
  sortableColumns: ['id', 'name', 'toys.name'],
  filterableColumns: {
    'toys.name': [FilterOperator.IN],
  },
}

const result = await paginate<CatEntity>(query, catRepo, config)

const config: PaginateConfig<CatEntity> = {
  // ...
  filterableColumns: {
    // Enable individual operators on a column
    id: [FilterOperator.EQ, FilterSuffix.NOT],

    // Enable all operators on a column
    age: true,
  },
}