import { z } from "zod";
import { config } from "../config.js";
import { requestWithSessionCredential } from "./credential-refresh.js";
import type { ProductCredential } from "./server-auth-client.js";
import { OperationalTaskClientError } from "./operational-task-client.js";

export const agentMessageSchema = z.object({
  message_id: z.string().uuid(), project_id: z.string().uuid(),
  task_id: z.string().uuid(), run_id: z.string().uuid(), request_id: z.string().uuid(),
  source_session_id: z.string(), source_owner_id: z.string(), conversation_owner_id: z.string(),
  target_session_id: z.string().nullable(), direction: z.enum(["to_task", "to_chat"]),
  in_reply_to: z.string().uuid().nullable(), text: z.string(),
  status: z.enum(["pending", "enqueued", "delivered", "failed"]),
  native_message_id: z.string(), failure_detail: z.string().nullable(),
  created_at: z.string(), updated_at: z.string(), delivered_at: z.string().nullable(),
});
export type AgentMessage = z.infer<typeof agentMessageSchema>;
export const agentMessagePageSchema = z.object({ items: z.array(agentMessageSchema), next_cursor: z.string().nullable() });
export type MessageCredential = string | ProductCredential;

/** Business records are Server-owned; credentials never become model arguments. */
export class AgentMessageClient {
  constructor(private readonly baseUrl = config.TJWATER_SERVER_BASE_URL) {}

  async request(credential: MessageCredential, path: string, method = "GET", body?: unknown): Promise<unknown> {
    const execute = (value: ProductCredential) => fetch(new URL(path, this.baseUrl), {
      method, signal: AbortSignal.timeout(config.TJWATER_SERVER_TIMEOUT_MS),
      headers: { Authorization: value.authorization, "X-Project-Id": value.projectId, "Content-Type": "application/json" },
      ...(body === undefined ? {} : { body: JSON.stringify(body) }),
    });
    const response = typeof credential === "string"
      ? await requestWithSessionCredential(credential, execute) : await execute(credential);
    const value: unknown = await response.json();
    if (!response.ok) {
      const problem = z.object({ code: z.string().optional(), message: z.string().optional(), detail: z.unknown().optional() }).passthrough().safeParse(value);
      const nested = problem.success ? z.object({ code: z.string().optional(), message: z.string().optional() }).safeParse(problem.data.detail) : null;
      throw new OperationalTaskClientError(response.status,
        (nested?.success ? nested.data.message : undefined) ?? (problem.success ? problem.data.message : undefined) ?? "Agent message request failed",
        (nested?.success ? nested.data.code : undefined) ?? (problem.success ? problem.data.code : undefined));
    }
    return value;
  }

  async list(credential: MessageCredential, sessionId: string, cursor?: string, limit = 50, pendingOnly = false) {
    const query = new URLSearchParams({ session_id: sessionId, limit: String(limit) });
    if (cursor) query.set("cursor", cursor);
    if (pendingOnly) query.set("pending_only", "true");
    return agentMessagePageSchema.parse(await this.request(credential, `/api/v1/agent-messages?${query}`));
  }

  async get(credential: MessageCredential, id: string) {
    return agentMessageSchema.parse(await this.request(credential, `/api/v1/agent-messages/${encodeURIComponent(id)}`));
  }

  async send(sessionId: string, input: { request_id: string; task_id: string; run_id: string; message: string }) {
    return agentMessageSchema.parse(await this.request(sessionId, "/api/v1/agent-messages", "POST", {
      request_id: input.request_id, task_id: input.task_id, run_id: input.run_id,
      source_session_id: sessionId, text: input.message,
    }));
  }

  async reply(sessionId: string, input: { request_id: string; message_id: string; message: string }) {
    return agentMessageSchema.parse(await this.request(sessionId, `/api/v1/agent-messages/${input.message_id}/reply`, "POST", {
      request_id: input.request_id, source_session_id: sessionId, text: input.message,
    }));
  }

  async receipt(credential: MessageCredential, item: AgentMessage, status: AgentMessage["status"], target: string | null, failure?: string) {
    return agentMessageSchema.parse(await this.request(credential, `/api/v1/agent-messages/${item.message_id}/delivery`, "POST", {
      status, target_session_id: target, native_message_id: item.native_message_id,
      failure_detail: failure ?? null,
    }));
  }
}

export const agentMessageClient = new AgentMessageClient();