import {
  ArrayMinSize,
  IsArray,
  IsIn,
  IsNumber,
  IsOptional,
  IsString,
  MaxLength,
  Min,
  MinLength,
  ValidateNested,
} from 'class-validator';
import { Type } from 'class-transformer';

const INVOICE_STATUSES = [
  'draft',
  'issued',
  'partially_paid',
  'paid',
  'canceled',
] as const;

const PAYMENT_METHODS = [
  'cash',
  'transfer',
  'card',
  'check',
  'other',
] as const;

export class InvoiceLineItemInputDto {
  @IsOptional()
  @IsString()
  productId?: string | null;

  @IsString()
  @MinLength(1)
  @MaxLength(200)
  name!: string;

  @Type(() => Number)
  @IsNumber()
  @Min(0.01)
  quantity!: number;

  @Type(() => Number)
  @IsNumber()
  @Min(0)
  unitPrice!: number;

  @IsOptional()
  @IsString()
  @MaxLength(8)
  currency?: string;
}

export class InvoiceInstallmentInputDto {
  @IsString()
  dueDate!: string;

  @Type(() => Number)
  @IsNumber()
  @Min(0.01)
  amount!: number;

  @IsOptional()
  @IsString()
  @MaxLength(8)
  currency?: string;
}

export class CreateInvoiceDto {
  @IsString()
  @MinLength(2)
  @MaxLength(200)
  title!: string;

  @IsOptional()
  @IsIn(INVOICE_STATUSES)
  status?: (typeof INVOICE_STATUSES)[number];

  @IsOptional()
  @IsString()
  @MaxLength(8)
  currency?: string;

  @IsOptional()
  @IsString()
  @MaxLength(4000)
  notes?: string;

  @IsOptional()
  @IsString()
  issuedAt?: string | null;

  @IsOptional()
  @IsString()
  dueDate?: string | null;

  @IsOptional()
  @IsString()
  personId?: string | null;

  @IsOptional()
  @IsString()
  companyId?: string | null;

  @IsOptional()
  @IsString()
  dealId?: string | null;

  @IsOptional()
  @IsString()
  quoteId?: string | null;

  @IsOptional()
  @IsString()
  fromDealId?: string | null;

  @IsOptional()
  @IsString()
  fromQuoteId?: string | null;

  @IsOptional()
  @IsArray()
  @ValidateNested({ each: true })
  @Type(() => InvoiceLineItemInputDto)
  @ArrayMinSize(0)
  lineItems?: InvoiceLineItemInputDto[];

  @IsOptional()
  @IsArray()
  @ValidateNested({ each: true })
  @Type(() => InvoiceInstallmentInputDto)
  installments?: InvoiceInstallmentInputDto[];
}

export class UpdateInvoiceDto {
  @IsOptional()
  @IsString()
  @MinLength(2)
  @MaxLength(200)
  title?: string;

  @IsOptional()
  @IsIn(INVOICE_STATUSES)
  status?: (typeof INVOICE_STATUSES)[number];

  @IsOptional()
  @IsString()
  @MaxLength(8)
  currency?: string;

  @IsOptional()
  @IsString()
  @MaxLength(4000)
  notes?: string | null;

  @IsOptional()
  @IsString()
  issuedAt?: string | null;

  @IsOptional()
  @IsString()
  dueDate?: string | null;

  @IsOptional()
  @IsString()
  personId?: string | null;

  @IsOptional()
  @IsString()
  companyId?: string | null;

  @IsOptional()
  @IsString()
  dealId?: string | null;

  @IsOptional()
  @IsString()
  quoteId?: string | null;

  @IsOptional()
  @IsArray()
  @ValidateNested({ each: true })
  @Type(() => InvoiceLineItemInputDto)
  lineItems?: InvoiceLineItemInputDto[];

  @IsOptional()
  @IsArray()
  @ValidateNested({ each: true })
  @Type(() => InvoiceInstallmentInputDto)
  installments?: InvoiceInstallmentInputDto[];
}

export class CreatePaymentDto {
  @Type(() => Number)
  @IsNumber()
  @Min(0.01)
  amount!: number;

  @IsOptional()
  @IsString()
  @MaxLength(8)
  currency?: string;

  @IsOptional()
  @IsIn(PAYMENT_METHODS)
  method?: (typeof PAYMENT_METHODS)[number];

  @IsOptional()
  @IsString()
  paidAt?: string;

  @IsOptional()
  @IsString()
  @MaxLength(2000)
  notes?: string;

  @IsOptional()
  @IsString()
  installmentId?: string | null;
}

export class ListInvoicesQueryDto {
  @IsOptional()
  @IsString()
  q?: string;

  @IsOptional()
  @IsIn(INVOICE_STATUSES)
  status?: (typeof INVOICE_STATUSES)[number];

  @IsOptional()
  @IsString()
  dealId?: string;

  @IsOptional()
  @IsString()
  personId?: string;

  @IsOptional()
  @IsString()
  quoteId?: string;

  @IsOptional()
  @Type(() => Number)
  @IsNumber()
  @Min(1)
  page?: number;

  @IsOptional()
  @Type(() => Number)
  @IsNumber()
  @Min(1)
  limit?: number;
}