// KBV5 前端純函式單元測試（vitest）。測的是 app.js 實際引用的 static/lib/pure.js 同一份。
// pure.js 是 UMD：ESM 載入時 module 未定義 → 落到 globalThis.KBV5Pure 分支。
import { describe, it, expect } from "vitest";
import "./pure.js";

const Pure = globalThis.KBV5Pure;

describe("commentAuthorName（B2 顯示名退化鏈）", () => {
  it("優先 display_name", () => {
    expect(Pure.commentAuthorName({ author_display_name: "王小明", author_username: "wang", author_id: 5 }))
      .toBe("王小明");
  });
  it("無 display_name → username", () => {
    expect(Pure.commentAuthorName({ author_display_name: null, author_username: "wang", author_id: 5 }))
      .toBe("wang");
  });
  it("都沒有 → #id（不顯示空白）", () => {
    expect(Pure.commentAuthorName({ author_id: 42 })).toBe("#42");
  });
  it("null 輸入安全", () => {
    expect(Pure.commentAuthorName(null)).toBe("");
  });
});

describe("mediaThumbKind（媒體卡片分類）", () => {
  it("image/* → image", () => expect(Pure.mediaThumbKind("image/png")).toBe("image"));
  it("video/* → video", () => expect(Pure.mediaThumbKind("video/mp4")).toBe("video"));
  it("application/pdf → pdf", () => expect(Pure.mediaThumbKind("application/pdf")).toBe("pdf"));
  it("其餘 → doc", () => expect(Pure.mediaThumbKind("application/zip")).toBe("doc"));
  it("空/undefined → doc", () => {
    expect(Pure.mediaThumbKind("")).toBe("doc");
    expect(Pure.mediaThumbKind(undefined)).toBe("doc");
  });
});

describe("libFilterHeaderText（B1 篩選後 header）", () => {
  it("未篩選（filtered==loaded）→ 共 N 篇文件", () => {
    expect(Pure.libFilterHeaderText({ baseTotal: 91, baseQuery: "", filteredLen: 91, loadedLen: 91 }))
      .toBe("共 91 篇文件");
  });
  it("篩選後縮窄 → 篩選後顯示 X 篇", () => {
    expect(Pure.libFilterHeaderText({ baseTotal: 91, baseQuery: "", filteredLen: 78, loadedLen: 91 }))
      .toBe("篩選後顯示 78 篇");
  });
  it("帶搜尋字 + 未縮窄 → 搜尋「q」· 找到 N 篇", () => {
    expect(Pure.libFilterHeaderText({ baseTotal: 12, baseQuery: "五軸", filteredLen: 12, loadedLen: 12 }))
      .toBe("搜尋「五軸」· 找到 12 篇");
  });
  it("帶搜尋字 + 縮窄 → 搜尋「q」· 篩選後顯示 X 篇", () => {
    expect(Pure.libFilterHeaderText({ baseTotal: 12, baseQuery: "五軸", filteredLen: 3, loadedLen: 12 }))
      .toBe("搜尋「五軸」· 篩選後顯示 3 篇");
  });
});

describe("selectAllLabel（#8 全選 N 篇）", () => {
  it("動態筆數", () => expect(Pure.selectAllLabel(91)).toBe("全選 91 篇"));
  it("0/undefined 安全", () => {
    expect(Pure.selectAllLabel(0)).toBe("全選 0 篇");
    expect(Pure.selectAllLabel(undefined)).toBe("全選 0 篇");
  });
});

describe("tallyAuditFacets（#9 稽核 facet 真實統計）", () => {
  const NOW = Date.parse("2026-06-06T12:00:00Z");
  const mk = (over) => Object.assign(
    { category: "read", risk: "low", result: "success",
      timestamp: "2026-06-06T10:00:00Z", display_name: "甲", username: "a" }, over);

  it("分類 / 風險 / 結果 計數正確", () => {
    const r = Pure.tallyAuditFacets([
      mk({ category: "auth" }), mk({ category: "auth" }), mk({ category: "edit" }),
      mk({ risk: "high" }), mk({ result: "fail" }),
    ], NOW);
    expect(r.cat.auth).toBe(2);
    expect(r.cat.edit).toBe(1);
    expect(r.cat.read).toBe(2);   // 預設 read（risk/result 那兩筆）
    expect(r.risk.high).toBe(1);
    expect(r.res.fail).toBe(1);
    expect(r.res.success).toBe(4);
  });

  it("時間窗 d7/d30/d90 依 timestamp 分桶", () => {
    const r = Pure.tallyAuditFacets([
      mk({ timestamp: "2026-06-05T00:00:00Z" }),  // 1 天前 → 全中
      mk({ timestamp: "2026-05-20T00:00:00Z" }),  // ~17 天前 → d30/d90
      mk({ timestamp: "2026-04-01T00:00:00Z" }),  // ~66 天前 → 只 d90
      mk({ timestamp: "2026-01-01T00:00:00Z" }),  // ~5 月前 → 都不中
    ], NOW);
    expect(r.d7).toBe(1);
    expect(r.d30).toBe(2);
    expect(r.d90).toBe(3);
  });

  it("使用者 top 排序（多→少）取前 6", () => {
    const items = [];
    for (let i = 0; i < 3; i++) items.push(mk({ display_name: "多", username: "m" }));
    items.push(mk({ display_name: "少", username: "f" }));
    const r = Pure.tallyAuditFacets(items, NOW);
    expect(r.topUsers[0]).toEqual(["多", 3]);
    expect(r.topUsers[1]).toEqual(["少", 1]);
  });

  it("無 display_name → username → (未知)", () => {
    const r = Pure.tallyAuditFacets([
      mk({ display_name: null, username: "u1" }),
      mk({ display_name: null, username: null }),
    ], NOW);
    const names = r.topUsers.map((t) => t[0]);
    expect(names).toContain("u1");
    expect(names).toContain("(未知)");
  });

  it("達 500 筆 → capped=true", () => {
    const items = Array.from({ length: 500 }, () => mk({}));
    expect(Pure.tallyAuditFacets(items, NOW).capped).toBe(true);
    expect(Pure.tallyAuditFacets([mk({})], NOW).capped).toBe(false);
  });

  it("空陣列安全", () => {
    const r = Pure.tallyAuditFacets([], NOW);
    expect(r.topUsers).toEqual([]);
    expect(r.d7).toBe(0);
  });
});

describe("visibilityLabel（提交頁可見度標籤）", () => {
  it("基本層級無附加", () => {
    expect(Pure.visibilityLabel({ visibility: "department" }, "部門內部"))
      .toBe("可見度：部門內部");
  });
  it("selected_departments 顯示部門數", () => {
    expect(Pure.visibilityLabel(
      { visibility: "selected_departments", allowed_departments: ["A", "B"] }, "指定部門"))
      .toBe("可見度：指定部門（2 部門）");
  });
  it("混合 access_list 顯示人數", () => {
    expect(Pure.visibilityLabel(
      { visibility: "public", access_list: [1, 2, 3] }, "公開"))
      .toBe("可見度：公開（3 人）");
  });
  it("部門 + 人員都有", () => {
    expect(Pure.visibilityLabel(
      { visibility: "selected_departments", allowed_departments: ["A"], access_list: [1] }, "指定"))
      .toBe("可見度：指定（1 部門・1 人）");
  });
});

describe("scanKeywords（PII 關鍵字/片語比對）", () => {
  const rules = [{ rule: "tw_name", pattern: "王小明", variants: ["小明"] },
                 { rule: "secret", pattern: "機密", variants: [] }];
  it("命中 pattern", () => {
    const h = Pure.scanKeywords("這是王小明的資料", rules);
    expect(h.length).toBe(1);
    expect(h[0].name).toBe("tw_name");
  });
  it("命中 variant", () => {
    expect(Pure.scanKeywords("小明你好", rules)[0].name).toBe("tw_name");
  });
  it("大小寫不敏感", () => {
    expect(Pure.scanKeywords("ABC機密DEF", rules).some((x) => x.name === "secret")).toBe(true);
  });
  it("無命中 / 空輸入安全", () => {
    expect(Pure.scanKeywords("無關內容", rules)).toEqual([]);
    expect(Pure.scanKeywords("", rules)).toEqual([]);
    expect(Pure.scanKeywords("x", [])).toEqual([]);
  });
});

describe("matchRegexRules（scanPii 純核心）", () => {
  it("全域正則抓多筆", () => {
    const rules = [{ name: "digits", re: /\d+/g }];
    const h = Pure.matchRegexRules("a12 b345", rules);
    expect(h.map((x) => x.match)).toEqual(["12", "345"]);
  });
  it("非 global 不無限迴圈（只取一筆）", () => {
    const h = Pure.matchRegexRules("a12 b345", [{ name: "d", re: /\d+/ }]);
    expect(h.length).toBe(1);
  });
  it("空輸入安全", () => {
    expect(Pure.matchRegexRules("", [{ name: "d", re: /\d+/g }])).toEqual([]);
  });
});

describe("submitGate（送出/草稿閘門）", () => {
  it("正常內容 → 可送出可草稿", () => {
    const g = Pure.submitGate({ len: 100, max: 50000, piiHitCount: 0 });
    expect(g.canSubmit).toBe(true); expect(g.canDraft).toBe(true);
  });
  it("PII 命中 → 不可送出但可草稿（§9.1 前端把關）", () => {
    const g = Pure.submitGate({ len: 100, max: 50000, piiHitCount: 2 });
    expect(g.canSubmit).toBe(false); expect(g.piiBlocked).toBe(true);
    expect(g.canDraft).toBe(true);
  });
  it("空內容 → 都不可", () => {
    const g = Pure.submitGate({ len: 0, max: 50000, piiHitCount: 0 });
    expect(g.canSubmit).toBe(false); expect(g.canDraft).toBe(false);
  });
  it("超字數上限 → 都不可", () => {
    const g = Pure.submitGate({ len: 60000, max: 50000, piiHitCount: 0 });
    expect(g.canSubmit).toBe(false); expect(g.canDraft).toBe(false);
  });
});

describe("relativeTime（相對時間標籤）", () => {
  const NOW = Date.parse("2026-06-06T12:00:00Z");
  it("空 → 空字串", () => expect(Pure.relativeTime("", NOW)).toBe(""));
  it("剛剛（<60s）", () => expect(Pure.relativeTime("2026-06-06T11:59:30Z", NOW)).toBe("剛剛"));
  it("分鐘前", () => expect(Pure.relativeTime("2026-06-06T11:30:00Z", NOW)).toBe("30 分鐘前"));
  it("小時前", () => expect(Pure.relativeTime("2026-06-06T09:00:00Z", NOW)).toBe("3 小時前"));
  it("天前", () => expect(Pure.relativeTime("2026-06-03T12:00:00Z", NOW)).toBe("3 天前"));
  it("無效字串 → 原樣回", () => expect(Pure.relativeTime("not-a-date", NOW)).toBe("not-a-date"));
  it("空格分隔 + 無 Z 也能解析", () =>
    expect(Pure.relativeTime("2026-06-06 11:59:30", NOW)).toBe("剛剛"));
});

describe("parseCsvList（標籤/清單解析）", () => {
  it("逗號分隔 + 去空白", () =>
    expect(Pure.parseCsvList("a, b ,c")).toEqual(["a", "b", "c"]));
  it("中文逗號/頓號/換行也分隔", () =>
    expect(Pure.parseCsvList("甲，乙、丙\n丁")).toEqual(["甲", "乙", "丙", "丁"]));
  it("去重 + 去空項", () =>
    expect(Pure.parseCsvList("a, ,a,b,")).toEqual(["a", "b"]));
  it("空/null 安全", () => {
    expect(Pure.parseCsvList("")).toEqual([]);
    expect(Pure.parseCsvList(null)).toEqual([]);
  });
});

describe("gradePassword（密碼強度，§10.5）", () => {
  it("空 → score 0", () => expect(Pure.gradePassword("").score).toBe(0));
  it("弱（短）", () => {
    const g = Pure.gradePassword("abc");
    expect(g.label).toBe("弱");
    expect(g.missing).toContain("≥ 8 字");
    expect(g.missing).toContain("1 大寫");
  });
  it("良好（8+大小寫+數字）", () => {
    const g = Pure.gradePassword("Abcdefg1");
    expect(g.score).toBe(4);   // len8 + 大 + 小 + 數字
    expect(g.label).toBe("強");
  });
  it("強（12+數字+特殊）", () => {
    const g = Pure.gradePassword("Abcdefgh123!");
    expect(g.score).toBe(5);
    expect(g.label).toBe("強");
  });
  it("缺大寫 → missing 提示", () => {
    expect(Pure.gradePassword("abcdefg1").missing).toContain("1 大寫");
  });
});

describe("fmtTok（token 簡寫）", () => {
  it("小數字原樣", () => expect(Pure.fmtTok(500)).toBe("500"));
  it("千 → K", () => expect(Pure.fmtTok(1500)).toBe("1.5K"));
  it("百萬 → M", () => expect(Pure.fmtTok(2_300_000)).toBe("2.3M"));
  it("0/null 安全", () => { expect(Pure.fmtTok(0)).toBe("0"); expect(Pure.fmtTok(null)).toBe("0"); });
});

describe("isAllowedEmailDomain（公司網域白名單）", () => {
  const domains = ["demo.local", "example.com"];
  it("白名單內 → true", () =>
    expect(Pure.isAllowedEmailDomain("a@demo.local", domains)).toBe(true));
  it("大小寫不敏感", () =>
    expect(Pure.isAllowedEmailDomain("A@Example.COM", domains)).toBe(true));
  it("不在白名單 → false", () =>
    expect(Pure.isAllowedEmailDomain("a@gmail.com", domains)).toBe(false));
  it("非 email / 空 → false", () => {
    expect(Pure.isAllowedEmailDomain("notanemail", domains)).toBe(false);
    expect(Pure.isAllowedEmailDomain("", domains)).toBe(false);
  });
});

describe("fmtKB / fmtMB（檔案大小）", () => {
  it("KB 一位小數", () => expect(Pure.fmtKB(1536)).toBe("1.5"));
  it("MB 兩位（預設）", () => expect(Pure.fmtMB(2 * 1024 * 1024)).toBe("2.00"));
  it("MB 指定位數", () => {
    expect(Pure.fmtMB(1.5 * 1024 * 1024, 1)).toBe("1.5");
    expect(Pure.fmtMB(2.6 * 1024 * 1024, 0)).toBe("3");
  });
  it("0/null 安全", () => { expect(Pure.fmtKB(0)).toBe("0.0"); expect(Pure.fmtMB(null)).toBe("0.00"); });
});

describe("escapeHtml（XSS 跳脫）", () => {
  it("跳脫五個危險字元", () =>
    expect(Pure.escapeHtml(`<script>"&'`)).toBe("&lt;script&gt;&quot;&amp;&#39;"));
  it("null/undefined → 空字串", () => {
    expect(Pure.escapeHtml(null)).toBe(""); expect(Pure.escapeHtml(undefined)).toBe("");
  });
  it("一般文字不變", () => expect(Pure.escapeHtml("正常內容 abc 123")).toBe("正常內容 abc 123"));
});

describe("diff（LCS 字詞級）", () => {
  it("相同 → 兩側皆等，無底色", () => {
    const d = Pure.diffSides("甲乙丙", "甲乙丙");
    expect(d.left).toBe("甲乙丙"); expect(d.right).toBe("甲乙丙");
    expect(d.left).not.toContain("background");
  });
  it("新增 → 右側綠底", () => {
    const d = Pure.diffSides("甲乙", "甲乙丙");
    expect(d.right).toContain("#bbf7d0");   // 綠
    expect(d.right).toContain("丙");
  });
  it("刪除 → 左側紅底", () => {
    const d = Pure.diffSides("甲乙丙", "甲乙");
    expect(d.left).toContain("#fecaca");    // 紅
  });
  it("diff 內容也經 escapeHtml（防 XSS）", () => {
    const d = Pure.diffSides("", "<b>x</b>");
    expect(d.right).toContain("&lt;");          // 危險字元已跳脫
    expect(d.right).toContain("&gt;");
    expect(d.right).not.toContain("<b>x</b>");  // 無原始未跳脫的 HTML
  });
  it("lcsOps 基本正確", () => {
    const ops = Pure.lcsOps(["a", "b", "c"], ["a", "x", "c"]);
    expect(ops.filter((o) => o.t === "eq").map((o) => o.v)).toEqual(["a", "c"]);
    expect(ops.some((o) => o.t === "del" && o.v === "b")).toBe(true);
    expect(ops.some((o) => o.t === "ins" && o.v === "x")).toBe(true);
  });
});

describe("renderMarkdown（極簡 markdown + XSS 安全）", () => {
  it("標題 # → h2", () =>
    expect(Pure.renderMarkdown("# 標題")).toContain("<h2>標題</h2>"));
  it("粗體 / 斜體 / code", () => {
    expect(Pure.renderMarkdown("**粗**")).toContain("<strong>粗</strong>");
    expect(Pure.renderMarkdown("`x`")).toContain("<code");
  });
  it("清單 - → li", () =>
    expect(Pure.renderMarkdown("- 項目")).toContain("<li>項目</li>"));
  it("合法連結 https:// → a", () => {
    const h = Pure.renderMarkdown("[連結](https://example.com)");
    expect(h).toContain('href="https://example.com"');
    expect(h).toContain('rel="noopener noreferrer"');
  });
  it("XSS：javascript: 連結不被轉成 a（擋危險協定）", () => {
    const h = Pure.renderMarkdown("[x](javascript:alert(1))");
    expect(h).not.toContain("<a ");      // 關鍵：未產生可點連結（停留為純文字，無害）
    expect(h).not.toContain('href=');    // 無任何 href
  });
  it("XSS：原始 <script> 被 escape", () => {
    const h = Pure.renderMarkdown("<script>alert(1)</script>");
    expect(h).toContain("&lt;script&gt;");
    expect(h).not.toContain("<script>");
  });
});

describe("diff 大型輸入退化行級（>2600 token 分支）", () => {
  it("超長內容仍正確 diff（走行級 LCS 退化，不卡頓）", () => {
    // 造 >2600 token：3000 行，每行一個詞
    const base = Array.from({ length: 3000 }, (_, i) => "行" + i).join("\n");
    const merged = base + "\n新增的最後一行";
    const d = Pure.diffSides(base, merged);
    expect(d.right).toContain("#bbf7d0");            // 有新增綠底
    expect(d.right).toContain("新增的最後一行");
    expect(d.left).not.toContain("新增的最後一行");  // 左側（既有）不含新行
  });
  it("wordDiffOps 直接驗：長輸入回 ops 陣列且含 ins", () => {
    const a = Array.from({ length: 2700 }, (_, i) => "x" + i).join("\n");
    const b = a + "\nZZZ";
    const ops = Pure.wordDiffOps(a, b);
    expect(Array.isArray(ops)).toBe(true);
    expect(ops.some((o) => o.t === "ins" && /ZZZ/.test(o.v))).toBe(true);
  });
});