// Tests for server/history.js — file-backed session storage + meta.
//
// Each test mounts an isolated tmp dir as DATA_DIR and re-inits the
// history module. We don't import the routes layer here — those need
// an Express app and are covered better by an integration test later.

import { test, describe, before, after } from "node:test";
import { strict as assert } from "node:assert";
import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";

let tmpDir;
let historyDir;
let history;

before(async () => {
  tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), "recap-history-test-"));
  historyDir = path.join(tmpDir, "history");
  history = await import("../history.js");
  await history.initHistory({ dataDir: tmpDir });
});

after(async () => {
  await fs.rm(tmpDir, { recursive: true, force: true }).catch(() => {});
});

describe("initHistory + getHistoryDir", () => {
  test("creates the history directory", async () => {
    const stat = await fs.stat(historyDir);
    assert.ok(stat.isDirectory());
  });

  test("getHistoryDir returns the configured path", () => {
    assert.equal(history.getHistoryDir(), historyDir);
  });

  test("init is idempotent", async () => {
    // Should not throw or wipe data.
    await history.initHistory({ dataDir: tmpDir });
    await history.initHistory({ dataDir: tmpDir });
  });
});

describe("saveToHistory", () => {
  // saveToHistory is scope-aware: it takes a `scope` first and writes under
  // history/<scope>/. Tests use the "owner" scope (single-mode / operator).
  const SCOPE = "owner";
  const scopeFile = (id) => path.join(historyDir, SCOPE, `${id}.json`);

  test("returns an id and writes a file with the expected shape", async () => {
    const id = await history.saveToHistory(
      SCOPE,
      "videoId123",
      "https://youtu.be/videoId123",
      "My title",
      [{ title: "Topic 1" }],
      [{ offset: 0, text: "hello" }],
      [{ message: "started" }],
      "20260101",
      "youtube"
    );
    assert.match(id, /^\d+-videoId123$/);

    const raw = await fs.readFile(scopeFile(id), "utf-8");
    const record = JSON.parse(raw);
    assert.equal(record.id, id);
    assert.equal(record.videoId, "videoId123");
    assert.equal(record.url, "https://youtu.be/videoId123");
    assert.equal(record.title, "My title");
    assert.equal(record.type, "youtube");
    assert.equal(record.topicCount, 1);
    assert.equal(record.segmentCount, 1);
    assert.equal(record.uploadDate, "20260101");
    assert.deepEqual(record.chunks, [{ title: "Topic 1" }]);
    assert.deepEqual(record.entries, [{ offset: 0, text: "hello" }]);
    assert.deepEqual(record.logs, [{ message: "started" }]);
    assert.ok(record.createdAt);
  });

  test("falls back to 'Untitled' when title is empty", async () => {
    const id = await history.saveToHistory(
      SCOPE,
      "noTitleX",
      "url",
      "",
      [],
      [],
      [],
      "",
      "youtube"
    );
    const raw = await fs.readFile(scopeFile(id), "utf-8");
    const record = JSON.parse(raw);
    assert.equal(record.title, "Untitled");
  });

  test("defaults type to 'youtube' when not specified", async () => {
    const id = await history.saveToHistory(SCOPE, "vid", "url", "t", [], [], [], "", null);
    const raw = await fs.readFile(scopeFile(id), "utf-8");
    assert.equal(JSON.parse(raw).type, "youtube");
  });

  test("encodes long podcast guids into a base64-truncated id suffix", async () => {
    const longGuid = "https://example.com/podcasts/feed.xml#episode-uuid-very-long-string";
    const id = await history.saveToHistory(SCOPE, longGuid, longGuid, "ep", [], [], [], "", "podcast");
    // suffix should be 16 base64 chars, not the raw URL
    assert.ok(!id.includes("https"));
    assert.match(id, /^\d+-[A-Za-z0-9_-]{16}$/);
  });
});

describe("loadMeta + saveMeta", () => {
  // loadMeta/saveMeta are scope-aware (history/<scope>/_meta.json).
  test("loadMeta returns default empty shape when file missing", async () => {
    // A scope that has never been written → default shape.
    const meta = await history.loadMeta("never-written-scope");
    assert.ok(Array.isArray(meta.folders));
    assert.ok(Array.isArray(meta.uncategorized));
  });

  test("saveMeta + loadMeta round-trips", async () => {
    const original = {
      folders: [{ id: "f1", name: "Bitcoin podcasts", collapsed: false, items: ["s1", "s2"] }],
      uncategorized: ["s3"],
    };
    await history.saveMeta("owner", original);
    const loaded = await history.loadMeta("owner");
    assert.deepEqual(loaded, original);
  });

  test("loadMeta returns default when _meta.json is corrupt", async () => {
    const dir = path.join(historyDir, "corrupt-scope");
    await fs.mkdir(dir, { recursive: true });
    await fs.writeFile(path.join(dir, "_meta.json"), "{ this is not json");
    const loaded = await history.loadMeta("corrupt-scope");
    assert.deepEqual(loaded.folders, []);
    assert.deepEqual(loaded.uncategorized, []);
  });
});

describe("safeFilename", () => {
  // Exported so callers writing user content to disk (e.g. library import)
  // can share the one guard instead of rolling their own.
  test("returns valid ids unchanged", () => {
    for (const id of ["abc123", "a_b-c", "VIDEOid123", "0"]) {
      assert.equal(history.safeFilename(id), id);
    }
  });

  test("rejects traversal, separators, and other unsafe chars", () => {
    for (const bad of ["../../evil", "..", "a/b", "a\\b", "a.json", "foo bar", "", "a:b"]) {
      assert.throws(() => history.safeFilename(bad), /invalid_session_id/);
    }
  });

  test("rejects non-strings", () => {
    assert.throws(() => history.safeFilename(123), /invalid_session_id/);
    assert.throws(() => history.safeFilename(null), /invalid_session_id/);
  });
});