import {
  IsString,
  IsOptional,
  IsEnum,
  IsNumber,
  IsBoolean,
  IsArray,
  ValidateNested,
  Min,
  Max,
  IsUUID,
} from 'class-validator';
import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
import { Type } from 'class-transformer';
import { SchemeType, AppliesTo, TierConfig } from '../entities/commission-scheme.entity';

export class TierConfigDto {
  @ApiProperty({ description: 'Tier lower bound (inclusive)' })
  @IsNumber()
  @Min(0)
  from: number;

  @ApiPropertyOptional({ description: 'Tier upper bound (exclusive), null for unlimited' })
  @IsOptional()
  @IsNumber()
  @Min(0)
  to: number | null;

  @ApiProperty({ description: 'Commission rate for this tier (0-100)' })
  @IsNumber()
  @Min(0)
  @Max(100)
  rate: number;
}

export class CreateSchemeDto {
  @ApiProperty({ description: 'Scheme name' })
  @IsString()
  name: string;

  @ApiPropertyOptional({ description: 'Scheme description' })
  @IsOptional()
  @IsString()
  description?: string;

  @ApiProperty({ enum: SchemeType, description: 'Commission calculation type', default: SchemeType.PERCENTAGE })
  @IsEnum(SchemeType)
  type: SchemeType;

  @ApiPropertyOptional({ description: 'Commission rate for percentage type (0-100)', default: 0 })
  @IsOptional()
  @IsNumber()
  @Min(0)
  @Max(100)
  rate?: number;

  @ApiPropertyOptional({ description: 'Fixed commission amount', default: 0 })
  @IsOptional()
  @IsNumber()
  @Min(0)
  fixed_amount?: number;

  @ApiPropertyOptional({ description: 'Tier configurations for tiered type', type: [TierConfigDto] })
  @IsOptional()
  @IsArray()
  @ValidateNested({ each: true })
  @Type(() => TierConfigDto)
  tiers?: TierConfig[];

  @ApiPropertyOptional({ enum: AppliesTo, description: 'What the commission applies to', default: AppliesTo.ALL })
  @IsOptional()
  @IsEnum(AppliesTo)
  applies_to?: AppliesTo;

  @ApiPropertyOptional({ description: 'Product IDs when applies_to is "products"', type: [String] })
  @IsOptional()
  @IsArray()
  @IsUUID('4', { each: true })
  product_ids?: string[];

  @ApiPropertyOptional({ description: 'Category IDs when applies_to is "categories"', type: [String] })
  @IsOptional()
  @IsArray()
  @IsUUID('4', { each: true })
  category_ids?: string[];

  @ApiPropertyOptional({ description: 'Minimum sale amount to qualify for commission', default: 0 })
  @IsOptional()
  @IsNumber()
  @Min(0)
  min_amount?: number;

  @ApiPropertyOptional({ description: 'Maximum commission per sale (cap)' })
  @IsOptional()
  @IsNumber()
  @Min(0)
  max_amount?: number;

  @ApiPropertyOptional({ description: 'Whether the scheme is active', default: true })
  @IsOptional()
  @IsBoolean()
  is_active?: boolean;
}