import { applyDecorators } from '@nestjs/common';
import {
  ApiBadRequestResponse,
  ApiConflictResponse,
  ApiForbiddenResponse,
  ApiNotFoundResponse,
  ApiProperty,
  ApiPropertyOptional,
  ApiUnauthorizedResponse,
  ApiUnprocessableEntityResponse,
} from '@nestjs/swagger';

/** Error body of the REST API (`DomainErrorFilter`, guards and validation). */
export class ApiErrorDto {
  @ApiProperty({ example: 404 })
  statusCode!: number;

  @ApiPropertyOptional({
    description: 'Domain error code',
    enum: ['NOT_FOUND', 'FORBIDDEN', 'VALIDATION', 'CONFLICT', 'BUSINESS_RULE'],
  })
  code?: string;

  @ApiProperty({
    description: 'Human message (a list of messages for invalid input)',
    oneOf: [{ type: 'string' }, { type: 'array', items: { type: 'string' } }],
    example: 'Issue not found',
  })
  message!: string | string[];
}

/** 400 / 401 / 403 / 404: what any authenticated read can answer. */
export const ApiReadErrors = () =>
  applyDecorators(
    ApiBadRequestResponse({ type: ApiErrorDto, description: 'Invalid input' }),
    ApiUnauthorizedResponse({
      type: ApiErrorDto,
      description: 'Missing or rejected Pireon token',
    }),
    ApiForbiddenResponse({
      type: ApiErrorDto,
      description: 'Not a member of the project (or not allowed)',
    }),
    ApiNotFoundResponse({ type: ApiErrorDto, description: 'Not found' }),
  );

/** Reads + 409 (concurrent change) and 422 (business rule) for commands. */
export const ApiCommandErrors = () =>
  applyDecorators(
    ApiReadErrors(),
    ApiConflictResponse({
      type: ApiErrorDto,
      description: 'Someone changed it at the same time: retry',
    }),
    ApiUnprocessableEntityResponse({
      type: ApiErrorDto,
      description: 'Business rule (e.g. a transition the workflow forbids)',
    }),
  );