import { Type } from 'class-transformer';
import { IsArray, IsInt, IsNotEmpty, IsObject, IsOptional, IsString, ValidateNested } from 'class-validator';
import { InlineTemplateDto } from '../templates/template.dto';

/** An email attachment reference — bytes live in the media store under `contentRef`. */
export class AttachmentDto {
  @IsOptional() @IsString() filename?: string;
  @IsString() @IsNotEmpty() contentRef!: string;
  @IsOptional() @IsString() mimeType?: string;
  @IsOptional() @IsInt() sizeBytes?: number;
}

/** POST /v1/mail/internal — app-to-app mail (no SMTP). Provide EITHER `key` OR `inline`. */
export class MailInternalDto {
  @IsOptional() @IsString() @IsNotEmpty() key?: string;
  @IsOptional() @IsInt() version?: number;
  @IsOptional() @ValidateNested() @Type(() => InlineTemplateDto) inline?: InlineTemplateDto;

  @IsString() @IsNotEmpty() recipientUserId!: string;
  @IsOptional() @IsObject() vars?: Record<string, unknown>;
  @IsOptional() @IsString() locale?: string;
  @IsString() @IsNotEmpty() idempotencyKey!: string;
  /** In-app attachment refs — stored as message parts so the recipient's inbox can render them. */
  @IsOptional() @IsArray() @ValidateNested({ each: true }) @Type(() => AttachmentDto) attachments?: AttachmentDto[];
}

/** POST /v1/mail/send — external email via SMTP + optional in-app mirror for a registered recipient. */
export class MailSendDto {
  @IsOptional() @IsString() @IsNotEmpty() key?: string;
  @IsOptional() @IsInt() version?: number;
  @IsOptional() @ValidateNested() @Type(() => InlineTemplateDto) inline?: InlineTemplateDto;

  @IsString() @IsNotEmpty() target!: string;
  @IsOptional() @IsObject() vars?: Record<string, unknown>;
  @IsOptional() @IsString() locale?: string;
  @IsString() @IsNotEmpty() idempotencyKey!: string;
  @IsOptional() @IsString() purpose?: string;
  @IsOptional() @IsArray() @ValidateNested({ each: true }) @Type(() => AttachmentDto) attachments?: AttachmentDto[];
  /** The registered recipient to mirror to; omit for a pre-registration send (email only). */
  @IsOptional() @IsString() mirrorToUserId?: string;
}