import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
import {
  IsArray,
  IsBoolean,
  IsEnum,
  IsInt,
  IsOptional,
  IsString,
  Max,
  Min,
  ValidateNested,
} from 'class-validator';
import { Type } from 'class-transformer';
import { BillingCycle } from '../../common/enums';
import { CalculateCostDto, UpgradeResourcesDto } from './billing.dto';

export class CreateDiscountDto {
  @ApiProperty({ example: 'NOWRUZ1403' })
  @IsString()
  code: string;

  @ApiProperty({ example: 'تخفیف نوروزی' })
  @IsString()
  name: string;

  @ApiPropertyOptional()
  @IsOptional()
  @IsString()
  description?: string;

  @ApiProperty({ example: 20, description: 'Percentage off (1–100)' })
  @IsInt()
  @Min(1)
  @Max(100)
  percentOff: number;

  @ApiPropertyOptional({
    type: [String],
    description: 'Service keys to target. Empty or ["*"] = all services.',
    example: ['optional:redis', 'runtime:nodejs'],
  })
  @IsOptional()
  @IsArray()
  @IsString({ each: true })
  services?: string[];

  @ApiPropertyOptional({ default: true })
  @IsOptional()
  @IsBoolean()
  isPublic?: boolean;

  @ApiPropertyOptional({ type: [String] })
  @IsOptional()
  @IsArray()
  @IsString({ each: true })
  allowedUserIds?: string[];

  @ApiPropertyOptional({ description: 'Total redemption cap (omit for unlimited)' })
  @IsOptional()
  @IsInt()
  @Min(1)
  maxUses?: number;

  @ApiPropertyOptional({ description: 'Per-user redemption cap (omit for unlimited)' })
  @IsOptional()
  @IsInt()
  @Min(1)
  maxUsesPerUser?: number;

  @ApiPropertyOptional({ description: 'ISO start date' })
  @IsOptional()
  @IsString()
  startsAt?: string;

  @ApiPropertyOptional({ description: 'ISO end date' })
  @IsOptional()
  @IsString()
  endsAt?: string;

  @ApiPropertyOptional({ default: true })
  @IsOptional()
  @IsBoolean()
  isActive?: boolean;
}

export class UpdateDiscountDto {
  @ApiPropertyOptional()
  @IsOptional()
  @IsString()
  code?: string;

  @ApiPropertyOptional()
  @IsOptional()
  @IsString()
  name?: string;

  @ApiPropertyOptional()
  @IsOptional()
  @IsString()
  description?: string;

  @ApiPropertyOptional({ example: 20 })
  @IsOptional()
  @IsInt()
  @Min(1)
  @Max(100)
  percentOff?: number;

  @ApiPropertyOptional({ type: [String] })
  @IsOptional()
  @IsArray()
  @IsString({ each: true })
  services?: string[];

  @ApiPropertyOptional()
  @IsOptional()
  @IsBoolean()
  isPublic?: boolean;

  @ApiPropertyOptional({ type: [String] })
  @IsOptional()
  @IsArray()
  @IsString({ each: true })
  allowedUserIds?: string[];

  @ApiPropertyOptional()
  @IsOptional()
  @IsInt()
  @Min(1)
  maxUses?: number | null;

  @ApiPropertyOptional()
  @IsOptional()
  @IsInt()
  @Min(1)
  maxUsesPerUser?: number | null;

  @ApiPropertyOptional()
  @IsOptional()
  @IsString()
  startsAt?: string | null;

  @ApiPropertyOptional()
  @IsOptional()
  @IsString()
  endsAt?: string | null;

  @ApiPropertyOptional()
  @IsOptional()
  @IsBoolean()
  isActive?: boolean;
}

export enum DiscountFlow {
  DEPLOY = 'deploy',
  RENEWAL = 'renewal',
  UPGRADE = 'upgrade',
}

/** Validate a coupon against a concrete charge context to preview the discount. */
export class ValidateDiscountDto {
  @ApiProperty({ example: 'NOWRUZ1403' })
  @IsString()
  code: string;

  @ApiProperty({ enum: BillingCycle })
  @IsEnum(BillingCycle)
  cycle: BillingCycle;

  @ApiPropertyOptional({ enum: DiscountFlow, default: DiscountFlow.DEPLOY })
  @IsOptional()
  @IsEnum(DiscountFlow)
  flow?: DiscountFlow;

  @ApiPropertyOptional({ type: CalculateCostDto, description: 'Deploy config (deploy flow)' })
  @IsOptional()
  @ValidateNested()
  @Type(() => CalculateCostDto)
  config?: CalculateCostDto;

  @ApiPropertyOptional({ description: 'Application id (renewal/upgrade flows)' })
  @IsOptional()
  @IsString()
  applicationId?: string;

  @ApiPropertyOptional({ type: UpgradeResourcesDto, description: 'Target resources (upgrade flow)' })
  @IsOptional()
  @ValidateNested()
  @Type(() => UpgradeResourcesDto)
  upgrade?: UpgradeResourcesDto;
}