/**
 * 邮件会话 → DSH 会话 id 的派生约定。
 *
 * 这组函数存在的原因是一个具体的静默失效：插件重启后 `sessionMap` 为空，
 * 人在 WebUI 改档位的 `session_update` 找不到目标会话就被忽略，
 * 运行时仍按旧档位执行 —— 人以为自己收紧了权限。
 */

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

import {
	dshSessionIdForMail,
	matchesMailSession,
	pickMailSession,
} from "../lib/mail-session-id.js";

test("首次尝试的 id 是 mail-<邮件会话 id>", () => {
	assert.equal(dshSessionIdForMail("abc-123"), "mail-abc-123");
});

test("匹配首次尝试的 id", () => {
	assert.equal(matchesMailSession("mail-abc", "abc"), true);
});

test("匹配模型降级重试的 -r<i>", () => {
	assert.equal(matchesMailSession("mail-abc-r1", "abc"), true);
	assert.equal(matchesMailSession("mail-abc-r12", "abc"), true);
});

test("不匹配别的会话（前缀相同也不行）", () => {
	assert.equal(
		matchesMailSession("mail-abcdef", "abc"),
		false,
		"mail-abc 的前缀不能吃掉 mail-abcdef",
	);
	assert.equal(matchesMailSession("mail-abd", "abc"), false);
	assert.equal(matchesMailSession("other-abc", "abc"), false);
	assert.equal(matchesMailSession("", "abc"), false);
});

test("不匹配非数字后缀（避免误吞其它会话）", () => {
	assert.equal(matchesMailSession("mail-abc-rx", "abc"), false);
	assert.equal(matchesMailSession("mail-abc-r", "abc"), false);
	assert.equal(matchesMailSession("mail-abc-retry", "abc"), false);
});

test("pickMailSession 优先首次尝试，而不是数组顺序", () => {
	// 数组顺序可能来自 ctx.agents.list()，与尝试顺序无关
	assert.equal(
		pickMailSession(["mail-abc-r2", "mail-abc-r1", "mail-abc"], "abc"),
		"mail-abc",
	);
});

test("pickMailSession 没有首次尝试时取序号最小的重试", () => {
	assert.equal(
		pickMailSession(["mail-abc-r3", "mail-abc-r1", "mail-abc-r2"], "abc"),
		"mail-abc-r1",
	);
});

test("pickMailSession 找不到时返回 undefined（调用方据此跳过）", () => {
	assert.equal(pickMailSession(["other-1", "mail-def"], "abc"), undefined);
	assert.equal(pickMailSession([], "abc"), undefined);
	assert.equal(pickMailSession(undefined, "abc"), undefined);
});

test("接管的平台会话推不出 id：不能被误判成邮件会话", () => {
	// 平台自己生成的 id（如 DSH 界面里开的会话）与邮件会话无关，
	// 匹配函数必须说「不是」，否则会给错误的会话改档位。
	assert.equal(matchesMailSession("session-7f3a91", "abc"), false);
	assert.equal(pickMailSession(["session-7f3a91"], "abc"), undefined);
});