import { Transform, Type } from "class-transformer";
import { IsNumber, IsOptional, IsString, MaxLength, Min, ValidateIf, ValidateNested } from "class-validator";

export class ExpensePayloadDto {
    @IsString()
    type!: string;

    @ValidateIf(o => (o.type ?? '').toUpperCase() !== 'MILEAGE')
    @IsNumber()
    @Min(0)
    amount?: number;

    @ValidateIf(o => (o.type ?? '').toUpperCase() === 'MILEAGE')
    @IsNumber()
    @Min(0)
    mileage?: number;

    @IsString()
    @MaxLength(280)
    @Transform(({ value }) => (typeof value === 'string' ? value.trim() : value))
    comment!: string;

    @IsOptional()
    @IsString()
    @MaxLength(255)
    attachment?: string;
}


export class UpsertExpenseDto {
    @IsOptional()
    @ValidateNested()
    @Type(()=> ExpensePayloadDto)
    old_expense?: ExpensePayloadDto;
    
    @IsOptional()
    @ValidateNested()
    @Type(()=> ExpensePayloadDto)
    new_expense?: ExpensePayloadDto;
}