import assert from "node:assert/strict";
import test from "node:test";

import {
  regenerateV9AssistantTurn,
  type RectificationRegenerationAgent,
} from "../src/lib/rectification-agentic/v9/regenerate-turn.ts";
import { RectificationToolServiceError } from "../src/lib/rectification-agentic/v9/tool-service.ts";
import {
  CASE_ID,
  SESSION_ID,
  SOURCE_TURN_ID,
  TURN_ID,
  USER_ID,
  dossierFixture,
  fakeAccounting,
} from "./rectification-v9-test-support.ts";

const REQUEST_ID = "88888888-8888-4888-8888-888888888888";
const OLD_REPLY = "旧的 Agent 正文";
const NEW_REPLY = "新的自然回复";

function completedTurns() {
  return [
    {
      id: TURN_ID,
      role: "user",
      text: "2020 年 4 月开始实习",
      status: "completed",
      created_at: "2026-08-13T01:00:00.000Z",
    },
    {
      id: TURN_ID,
      role: "assistant",
      text: OLD_REPLY,
      status: "completed",
      created_at: "2026-08-13T01:00:00.000Z",
    },
  ];
}

function fakeAgent(overrides: Partial<RectificationRegenerationAgent> = {}) {
  const calls = { getSkill: 0, generate: 0 };
  const agent: RectificationRegenerationAgent = {
    async getSkill() {
      calls.getSkill += 1;
      return { name: "jyotish-birth-time-rectification" };
    },
    async generate() {
      calls.generate += 1;
      return { text: NEW_REPLY };
    },
    ...overrides,
  };
  return { agent, calls };
}

function validAccounting() {
  return fakeAccounting({
    get_agentic_rectification_turn_regeneration: () => null,
    get_agentic_rectification_case_dossier: () => dossierFixture({ turns: completedTurns() }),
    regenerate_agentic_rectification_turn: () => ({
      ok: true,
      turn_id: TURN_ID,
      assistant_message: NEW_REPLY,
      idempotent: false,
    }),
  });
}

function options(
  accounting: ReturnType<typeof fakeAccounting>["client"],
  agent: RectificationRegenerationAgent,
  overrides: Partial<Parameters<typeof regenerateV9AssistantTurn>[0]> = {},
) {
  return {
    userId: USER_ID,
    caseId: CASE_ID,
    sessionId: SESSION_ID,
    turnId: TURN_ID,
    requestId: REQUEST_ID,
    accounting,
    agent,
    ...overrides,
  };
}

async function rejectsWithCode(promise: Promise<unknown>, code: string) {
  await assert.rejects(promise, (error: unknown) => (
    error instanceof RectificationToolServiceError && error.code === code
  ));
}

test("regeneration replaces the latest completed Assistant text in place", async () => {
  const accounting = validAccounting();
  const { agent, calls } = fakeAgent();

  const result = await regenerateV9AssistantTurn(options(accounting.client, agent));

  assert.deepEqual(result, {
    ok: true,
    turnId: TURN_ID,
    assistantMessage: NEW_REPLY,
    idempotent: false,
  });
  assert.equal(calls.getSkill, 1);
  assert.equal(calls.generate, 1);
  assert.deepEqual(accounting.calls.map((call) => call.fn), [
    "get_agentic_rectification_turn_regeneration",
    "get_agentic_rectification_case_dossier",
    "regenerate_agentic_rectification_turn",
  ]);
  const update = accounting.calls.at(-1);
  assert.equal(update?.args.p_assistant_message, NEW_REPLY);
  assert.equal(accounting.calls.some((call) => call.fn === "append_agentic_rectification_turn"), false);
});

test("same request id returns the stored replacement without invoking the Agent again", async () => {
  const accounting = fakeAccounting({
    get_agentic_rectification_turn_regeneration: () => ({
      ok: true,
      turn_id: TURN_ID,
      assistant_message: NEW_REPLY,
      idempotent: true,
    }),
  });
  const { agent, calls } = fakeAgent();

  const result = await regenerateV9AssistantTurn(options(accounting.client, agent));

  assert.equal(result.idempotent, true);
  assert.equal(calls.getSkill, 0);
  assert.equal(calls.generate, 0);
  assert.deepEqual(accounting.calls.map((call) => call.fn), [
    "get_agentic_rectification_turn_regeneration",
  ]);
});

test("terminal cases cannot regenerate replies", async () => {
  const accounting = fakeAccounting({
    get_agentic_rectification_turn_regeneration: () => null,
    get_agentic_rectification_case_dossier: () => dossierFixture({
      status: "closed",
      turns: completedTurns(),
    }),
  });
  const { agent, calls } = fakeAgent();

  await rejectsWithCode(
    regenerateV9AssistantTurn(options(accounting.client, agent)),
    "agentic_rectification_case_terminal",
  );
  assert.equal(calls.generate, 0);
});

test("case and session must remain exactly bound", async () => {
  const accounting = validAccounting();
  const { agent, calls } = fakeAgent();

  await rejectsWithCode(
    regenerateV9AssistantTurn(options(accounting.client, agent, {
      sessionId: "99999999-9999-4999-8999-999999999999",
    })),
    "agentic_rectification_case_session_mismatch",
  );
  assert.equal(calls.generate, 0);
});

test("only the latest completed Assistant turn can be regenerated", async () => {
  const turns = [
    {
      id: SOURCE_TURN_ID,
      role: "assistant",
      text: "更早的回答",
      status: "completed",
      created_at: "2026-08-13T00:00:00.000Z",
    },
    ...completedTurns(),
  ];
  const accounting = fakeAccounting({
    get_agentic_rectification_turn_regeneration: () => null,
    get_agentic_rectification_case_dossier: () => dossierFixture({ turns }),
  });
  const { agent, calls } = fakeAgent();

  await rejectsWithCode(
    regenerateV9AssistantTurn(options(accounting.client, agent, { turnId: SOURCE_TURN_ID })),
    "agentic_rectification_turn_not_latest",
  );
  assert.equal(calls.generate, 0);
  assert.equal(accounting.calls.some((call) => call.fn === "regenerate_agentic_rectification_turn"), false);
});

test("missing or empty completed Assistant text is rejected", async () => {
  const accounting = fakeAccounting({
    get_agentic_rectification_turn_regeneration: () => null,
    get_agentic_rectification_case_dossier: () => dossierFixture({
      turns: [{
        id: TURN_ID,
        role: "assistant",
        text: "   ",
        status: "completed",
        created_at: "2026-08-13T01:00:00.000Z",
      }],
    }),
  });
  const { agent, calls } = fakeAgent();

  await rejectsWithCode(
    regenerateV9AssistantTurn(options(accounting.client, agent)),
    "agentic_rectification_turn_not_found",
  );
  assert.equal(calls.generate, 0);
});

test("an empty regenerated body never reaches the update RPC", async () => {
  const accounting = validAccounting();
  const { agent } = fakeAgent({
    async generate() {
      return { text: "   " };
    },
  });

  await rejectsWithCode(
    regenerateV9AssistantTurn(options(accounting.client, agent)),
    "agentic_rectification_regeneration_empty",
  );
  assert.equal(accounting.calls.some((call) => call.fn === "regenerate_agentic_rectification_turn"), false);
});