import {
  ApiProperty,
  ApiPropertyOptional,
  getSchemaPath,
  OmitType,
  PickType,
} from '@nestjs/swagger';
import { Type } from 'class-transformer';
import {
  IsArray,
  IsDateString,
  IsIn,
  IsInt,
  IsOptional,
  IsString,
  IsUUID,
  Max,
  MaxLength,
  Min,
  MinLength,
  ValidateNested,
} from 'class-validator';

import { MAX_INSTRUMENT_QUERY_LENGTH, MIN_INSTRUMENT_QUERY_LENGTH } from '../instrument-query';
import { operationCategories } from '../operations/operations.api';

const MIN_ACCOUNT_ID_LENGTH = 1;
const MIN_SYNC_PAGE_SIZE = 1;

const maxAccountIdLength = 256;
const maxPageSize = 1000;

export const investmentScreens = [
  'accounts',
  'account',
  'operations',
  'income',
  'events',
  'stocks',
  'bonds',
  'stock',
  'bond',
] as const;
export class SyncCandleRangeDto {
  @ApiProperty({ format: 'date-time' }) @IsDateString() declare from: string;
  @ApiProperty({ format: 'date-time' }) @IsDateString() declare to: string;
}
export class InvestmentScreenDto {
  @ApiProperty({ enum: investmentScreens })
  @IsIn(investmentScreens)
  declare screen: (typeof investmentScreens)[number];

  @ApiPropertyOptional()
  @IsOptional()
  @IsString()
  @MinLength(MIN_ACCOUNT_ID_LENGTH)
  @MaxLength(maxAccountIdLength)
  accountId?: string;

  @ApiPropertyOptional({
    oneOf: [
      { type: 'string', format: 'date' },
      { type: 'string', format: 'date-time' },
    ],
  })
  @IsOptional()
  @IsDateString({ strict: true })
  from?: string;

  @ApiPropertyOptional({
    oneOf: [
      { type: 'string', format: 'date' },
      { type: 'string', format: 'date-time' },
    ],
  })
  @IsOptional()
  @IsDateString({ strict: true })
  to?: string;

  @ApiPropertyOptional({ format: 'uuid' })
  @IsOptional()
  @IsUUID()
  instrumentUid?: string;

  @ApiPropertyOptional()
  @IsOptional()
  @IsString()
  @MinLength(MIN_INSTRUMENT_QUERY_LENGTH)
  @MaxLength(MAX_INSTRUMENT_QUERY_LENGTH)
  query?: string;

  @ApiPropertyOptional({ enum: ['month', 'halfYear', 'year', 'all'] })
  @IsOptional()
  @IsIn(['month', 'halfYear', 'year', 'all'])
  candlePeriod?: 'all' | 'halfYear' | 'month' | 'year';

  @ApiPropertyOptional({ type: SyncCandleRangeDto })
  @IsOptional()
  @ValidateNested()
  @Type(() => SyncCandleRangeDto)
  candleRange?: SyncCandleRangeDto;

  @ApiPropertyOptional({ enum: operationCategories, isArray: true })
  @IsOptional()
  @IsArray()
  @IsIn(operationCategories, { each: true })
  categories?: (typeof operationCategories)[number][];

  @ApiPropertyOptional({ minimum: MIN_SYNC_PAGE_SIZE, maximum: maxPageSize })
  @IsOptional()
  @IsInt()
  @Min(MIN_SYNC_PAGE_SIZE)
  @Max(maxPageSize)
  limit?: number;
}

export class IncomeInvestmentScreenDto extends PickType(InvestmentScreenDto, [
  'accountId',
]) {
  @ApiProperty({ enum: ['income'] }) declare screen: 'income';
  // eslint-disable-next-line @darraghor/nestjs-typed/api-property-matches-property-optionality -- Overrides optional metadata inherited through PickType.
  @ApiProperty({ required: true }) declare accountId: string;
  @ApiPropertyOptional({
    format: 'date',
    description:
      'Inclusive start calendar date in Europe/Moscow (YYYY-MM-DD). Supply both from and to, or neither for the current Moscow month.',
  })
  from?: string;

  @ApiPropertyOptional({
    format: 'date',
    description:
      'Inclusive end calendar date in Europe/Moscow (YYYY-MM-DD). Supply both from and to, or neither. Timestamp queries use the start of the following Moscow day as the exclusive end, capped at now.',
  })
  to?: string;
}

export class EventsInvestmentScreenDto extends PickType(InvestmentScreenDto, [
  'accountId',
]) {
  @ApiProperty({ enum: ['events'] }) declare screen: 'events';
  // eslint-disable-next-line @darraghor/nestjs-typed/api-property-matches-property-optionality -- Overrides optional metadata inherited through PickType.
  @ApiProperty({ required: true }) declare accountId: string;
  @ApiPropertyOptional({
    format: 'date',
    description:
      'Inclusive UTC calendar start date (YYYY-MM-DD). May be supplied independently; defaults to today in UTC.',
  })
  from?: string;

  @ApiPropertyOptional({
    format: 'date',
    description:
      'Inclusive UTC calendar end date (YYYY-MM-DD). May be supplied independently; defaults to 30 days after from. Timestamp queries use the start of the following UTC day as the exclusive end.',
  })
  to?: string;
}

const timestampScreens = [
  'accounts',
  'account',
  'operations',
  'stocks',
  'bonds',
  'stock',
  'bond',
] as const;

export class TimestampInvestmentScreenDto extends OmitType(
  InvestmentScreenDto,
  ['screen', 'from', 'to'],
) {
  // The runtime validator retains legacy date-only inputs; the public contract uses instants.
  @ApiProperty({ enum: timestampScreens })
  declare screen: (typeof timestampScreens)[number];

  @ApiPropertyOptional({
    format: 'date-time',
    description: 'Start instant for operations.',
  })
  from?: string;

  @ApiPropertyOptional({
    format: 'date-time',
    description: 'End instant for operations.',
  })
  to?: string;
}

export const investmentScreenSchema = {
  oneOf: [
    IncomeInvestmentScreenDto,
    EventsInvestmentScreenDto,
    TimestampInvestmentScreenDto,
  ].map((model) => ({ $ref: getSchemaPath(model) })),
  discriminator: {
    propertyName: 'screen',
    mapping: {
      income: getSchemaPath(IncomeInvestmentScreenDto),
      events: getSchemaPath(EventsInvestmentScreenDto),
      ...Object.fromEntries(
        timestampScreens.map((screen) => [
          screen,
          getSchemaPath(TimestampInvestmentScreenDto),
        ]),
      ),
    },
  },
};

export class TbankSyncAcceptedDto {
  @ApiProperty({ format: 'uuid' }) declare id: string;
  @ApiProperty({ type: Object, ...investmentScreenSchema })
  declare scope: InvestmentScreenDto;

  @ApiProperty({ format: 'date-time' }) declare now: string;
}
export class TbankSyncStatusDto {
  @ApiProperty({ format: 'uuid' }) declare id: string;
  @ApiProperty({ type: Object, ...investmentScreenSchema, nullable: true })
  declare scope: InvestmentScreenDto | null;

  @ApiProperty({ format: 'date-time' }) declare now: string;
  @ApiProperty({ enum: ['running', 'succeeded', 'failed', 'cancelled'] })
  declare state: 'cancelled' | 'failed' | 'running' | 'succeeded';

  @ApiProperty({ type: String, nullable: true }) declare errorCode:
    null | string;
}