import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';

export class ChatSessionRowDto {
  @ApiProperty({ type: String, example: '1', description: '会话 ID（数字字符串）' })
  id!: string;

  @ApiProperty({ type: String, example: '1', description: '用户 ID（数字字符串）' })
  userId!: string;

  @ApiProperty({
    type: String,
    description: '标题（可能为空字符串）',
    example: '你好',
  })
  title!: string;

  @ApiProperty({ type: String, description: '创建时间 ISO8601' })
  createdAt!: string;

  @ApiProperty({ type: String, description: '更新时间 ISO8601' })
  updatedAt!: string;
}

export class ChatSessionListResponseDto {
  @ApiProperty({ type: () => ChatSessionRowDto, isArray: true })
  items!: ChatSessionRowDto[];

  @ApiProperty({ type: Number })
  total!: number;

  @ApiProperty({ type: Number })
  limit!: number;

  @ApiProperty({ type: Number })
  offset!: number;
}

export class ChatMessageRowDto {
  @ApiProperty({ type: String, example: '1', description: '消息 ID（数字字符串）' })
  id!: string;

  @ApiProperty({ type: String, example: 'user' })
  role!: string;

  @ApiProperty({ type: String })
  content!: string;

  @ApiProperty({
    type: Number,
    description: 'completion token 数（用户消息为 0）',
  })
  tokenCount!: number;

  @ApiPropertyOptional({
    type: String,
    nullable: true,
    description: '大模型渠道（用户消息一般为 null）',
  })
  provider?: string | null;

  @ApiProperty({ type: String, description: '创建时间 ISO8601' })
  createdAt!: string;
}

export class ChatMessageListResponseDto {
  @ApiProperty({ type: String, example: '1' })
  sessionId!: string;

  @ApiProperty({ type: () => ChatMessageRowDto, isArray: true })
  items!: ChatMessageRowDto[];

  @ApiProperty({ type: Number })
  total!: number;

  @ApiProperty({ type: Number })
  limit!: number;

  @ApiProperty({ type: Number })
  offset!: number;
}