/**
 * 聊天历史响应
 * 原始 Dart: ChatHistoryResponse (lib/data/models/chat/chat_response.dart)
 */
import { z } from "zod";
import { ChatMessage, ChatMessageSchema } from "./chat_message";

export const ChatHistoryResponseSchema = z.object({
  messages: z.array(ChatMessageSchema),
  total: z.number().default(0),
  limit: z.number(),
  offset: z.number(),
});

export type ChatHistoryResponseInput = z.input<typeof ChatHistoryResponseSchema>;
export type ChatHistoryResponseData = z.output<typeof ChatHistoryResponseSchema>;

export class ChatHistoryResponse {
  declare readonly messages: ChatMessage[];
  declare readonly total: number;
  declare readonly limit: number;
  declare readonly offset: number;

  private constructor(input: ChatHistoryResponseInput) {
    const data = ChatHistoryResponseSchema.parse(input);
    Object.assign(this, data);
    Object.freeze(this);
  }

  static from(input: ChatHistoryResponseInput): ChatHistoryResponse {
    return new ChatHistoryResponse(input);
  }

  static fromJson(json: unknown): ChatHistoryResponse {
    return ChatHistoryResponse.from(json as ChatHistoryResponseInput);
  }

  toJson(): ChatHistoryResponseData {
    return ChatHistoryResponseSchema.parse(this);
  }
}