import { test, beforeEach } from 'node:test';
import assert from 'node:assert/strict';
import { match, resolveUrl, navigate, subscribe, currentUrl, opportunityUrl, reportUrl, detailUrl, safeReturnTo, returnToRoute, setQuery, onLinkClick } from '../src/utils/router.js';

let base, entries, cursor;

test('详情的来源和证据链接保留筛选，替换上一种详情，并兼容旧链接', () => {
  const source = resolveUrl(detailUrl('source', '原文 1', '/reports/voc?ev=高&stage=S3&artifact=a1&page=2'));
  assert.equal(source.searchParams.get('source'), '原文 1');
  assert.equal(source.searchParams.get('ev'), '高');
  assert.equal(source.searchParams.get('artifact'), null);
  assert.equal(source.searchParams.get('page'), '2');
  const evidence = resolveUrl(detailUrl('evidence', 'ev:1', '/reports/voc?ev=高&source=s1', 'report1'));
  assert.equal(evidence.searchParams.get('ev'), '高');
  assert.equal(evidence.searchParams.get('evidence'), 'ev:1');
  assert.equal(evidence.searchParams.get('evidenceReport'), 'report1');
  assert.equal(evidence.searchParams.get('source'), null);
  const legacy = resolveUrl(detailUrl('', '', '/pool/o1?ev=old&report=r1&returnTo=%2Fmembers'));
  assert.equal(legacy.searchParams.get('ev'), null);
  assert.equal(legacy.searchParams.get('report'), null);
  assert.equal(legacy.searchParams.get('returnTo'), '/members');
});
beforeEach(() => {
  base = '/preview/';
  entries = [{ url: new URL('https://board.test/preview/pool?stage=S3&sort=latest'), state: null }];
  cursor = 0;
  globalThis.location = entries[0].url;
  globalThis.document = { querySelector: () => ({ getAttribute: () => base }) };
  globalThis.window = new EventTarget();
  window.scrollY = 350;
  globalThis.PopStateEvent = class extends Event {
    constructor(type, options) { super(type); this.state = options.state; }
  };
  globalThis.history = {
    get state() { return entries[cursor].state; },
    replaceState(state, _, url) {
      entries[cursor] = { state, url: url ? new URL(url, location.href) : location };
      globalThis.location = entries[cursor].url;
    },
    pushState(state, _, url) {
      entries.splice(++cursor, entries.length, { state, url: new URL(url, location.href) });
      globalThis.location = entries[cursor].url;
    },
    back() {
      if (!cursor) return;
      globalThis.location = entries[--cursor].url;
      window.dispatchEvent(new PopStateEvent('popstate', { state: history.state }));
    },
  };
});

test('机会卡深链接保留筛选、排序和关闭返回地址；报告携带回卡片地址', () => {
  const opp = opportunityUrl('机会 1');
  const url = resolveUrl(opp);
  assert.equal(url.pathname, '/preview/pool/%E6%9C%BA%E4%BC%9A%201');
  assert.equal(url.searchParams.get('stage'), 'S3');
  assert.equal(url.searchParams.get('sort'), 'latest');
  assert.equal(url.searchParams.get('returnTo'), '/pool?stage=S3&sort=latest');
  const report = resolveUrl(reportUrl('r 1', opp));
  assert.equal(report.searchParams.get('returnTo'), opp);
  assert.equal(match(url.pathname.slice('/preview'.length)).params.id, '机会 1');
});

test('来自其他页面的机会卡返回原页，不将来源页参数误用为卡池筛选', () => {
  const url = resolveUrl(opportunityUrl('o1', '/members?member=小智'));
  assert.equal(url.searchParams.get('member'), null);
  assert.equal(url.searchParams.get('returnTo'), '/members?member=小智');
});

test('推入历史保存离开页的位置，换卡 replace 保留返回凭据且不多压一层', () => {
  const back = currentUrl();
  navigate(opportunityUrl('o1'), { state: { kfOverlay: { returnTo: back } } });
  assert.equal(entries[0].state.kfScrollY, 350);
  assert.equal(history.state.kfFrom, back);
  navigate(opportunityUrl('o2', back), { replace: true });
  assert.equal(entries.length, 2);
  assert.equal(history.state.kfOverlay.returnTo, back);
  assert.equal(match().params.id, 'o2');
  history.back();
  assert.equal(currentUrl(), back);
});

test('订阅分别识别站内导航与浏览器返回，返回读取当前实际路径和位置', () => {
  const changes = [];
  const off = subscribe(value => changes.push(value));
  navigate('/report/r1?ch=limits');
  history.back();
  off();
  assert.deepEqual(changes.map(c => c.navigation), ['initial', 'push', 'traverse']);
  assert.equal(changes.at(-1).name, 'pool');
  assert.equal(changes.at(-1).historyState.kfScrollY, 350);
});

test('章节和浮层查询串更新不丢返回地址和历史状态', () => {
  navigate(reportUrl('r1', '/pool/o1?stage=S3'));
  setQuery({ ch: 'limits', ev: 'e1', report: 'r1' });
  setQuery({ ev: null, report: null });
  const q = new URLSearchParams(location.search);
  assert.equal(q.get('returnTo'), '/pool/o1?stage=S3');
  assert.equal(q.get('ch'), 'limits');
  assert.equal(q.get('ev'), null);
  assert.equal(history.state.kfFrom, '/pool?stage=S3&sort=latest');
});

test('非法或站外返回地址落到应用内兜底，损坏编码匹配为不存在', () => {
  for (const path of ['https://evil.test/', '//evil.test/', '/\\evil.test/', '/missing', '/pool\n']) {
    assert.equal(safeReturnTo(path, '/reports'), '/reports');
  }
  assert.equal(match('/pool/%E0%A4%A').name, 'notfound');
  assert.equal(match('/reports/competitor/r1').name, 'report');
});

test('根部署与子路径导航均保留查询和章节，不重复压入相同 URL', () => {
  base = '/';
  assert.equal(resolveUrl('/report/r1?ch=2#top').href, 'https://board.test/report/r1?ch=2#top');
  base = '/preview/';
  navigate('/report/r1?ch=2#top');
  navigate('/report/r1?ch=2#top');
  assert.equal(entries.length, 2);
  assert.equal(location.pathname, '/preview/report/r1');
  assert.equal(currentUrl(), '/report/r1?ch=2#top');
});

test('报告返回链接使用浏览器历史；新标签与下载链接保留浏览器行为', () => {
  globalThis.HTMLAnchorElement = class {
    constructor(path, attrs = {}) { this.href = resolveUrl(path).href; this.attrs = attrs; this.target = attrs.target || ''; }
    matches() { return true; }
    hasAttribute(name) { return Object.hasOwn(this.attrs, name); }
  };
  globalThis.Element = HTMLAnchorElement;
  const click = anchor => {
    const e = { button: 0, composedPath: () => [anchor], preventDefault() { this.prevented = true; }, stopPropagation() {} };
    onLinkClick(e);
    return e;
  };
  const back = currentUrl();
  navigate('/report/r1');
  assert.ok(click(new HTMLAnchorElement(back, { 'data-back': '' })).prevented);
  assert.equal(currentUrl(), back);
  assert.equal(cursor, 0);
  assert.equal(click(new HTMLAnchorElement('/pool/o1', { target: '_blank' })).prevented, undefined);
  assert.equal(click(new HTMLAnchorElement('/report/r1', { download: '' })).prevented, undefined);
});

test('历史达到浏览器上限、来源条目被裁剪时，关闭仍回指定页', () => {
  const origin = currentUrl();
  navigate(opportunityUrl('o1'));
  window.navigation = {
    currentEntry: { index: 4 },
    entries: () => [{ index: 3, url: hrefForTest('/members') }, { index: 4, url: location.href }],
  };
  returnToRoute(origin, { canGoBack: true });
  assert.equal(cursor, 1);
  assert.equal(currentUrl(), origin);
});

function hrefForTest(path) { return resolveUrl(path).href; }