import { describe, it, before, after } from "node:test";
import assert from "node:assert/strict";
import * as fs from "node:fs";
import * as path from "node:path";
import * as os from "node:os";
import { createApp } from "../server/index.js";

describe("Spectra YouTube Suggest Engine - Test Suite", () => {
  let app;
  let server;
  let baseUrl;
  let testDbPath;

  before(async () => {
    testDbPath = path.join(os.tmpdir(), `spectra-test-${Date.now()}.db`);
    app = createApp(testDbPath);
    server = app.server;

    await new Promise(resolve => {
      server.listen(0, "127.0.0.1", () => {
        const port = server.address().port;
        baseUrl = `http://127.0.0.1:${port}`;
        resolve();
      });
    });
  });

  after(async () => {
    await new Promise(resolve => server.close(resolve));
    if (fs.existsSync(testDbPath)) {
      try {
        fs.unlinkSync(testDbPath);
      } catch (e) {}
    }
  });

  it("1. GET /api/health returns 200 with database healthy", async () => {
    const res = await fetch(`${baseUrl}/api/health`);
    assert.equal(res.status, 200);
    const data = await res.json();
    assert.equal(data.status, "ok");
    assert.equal(data.database, "healthy");
    assert.equal(data.app, "spectra");

    // Also verify HEAD request for Homepage / uptime monitoring
    const headRes = await fetch(`${baseUrl}/api/health`, { method: "HEAD" });
    assert.equal(headRes.status, 200);
  });

  it("2. GET /api/topics returns curated starter topics and people", async () => {
    const res = await fetch(`${baseUrl}/api/topics`);
    assert.equal(res.status, 200);
    const data = await res.json();
    assert.ok(data.topics.length >= 8);
    const hasScreenprint = data.topics.some(t => t.id === "vintage-screenprint");
    const hasEspresso = data.topics.some(t => t.id === "specialty-espresso");
    const hasJamesHoffmann = data.topics.some(t => t.name.includes("James Hoffmann"));
    assert.ok(hasScreenprint, "Should include vintage screenprint");
    assert.ok(hasEspresso, "Should include specialty espresso");
    assert.ok(hasJamesHoffmann, "Should include James Hoffmann");
  });

  it("3. GET /api/suggestions generates suggestions with no repeats", async () => {
    // Generate Batch 1
    const res1 = await fetch(`${baseUrl}/api/suggestions?limit=6&live=false`);
    assert.equal(res1.status, 200);
    const data1 = await res1.json();
    assert.ok(data1.suggestions.length > 0);
    const batch1Ids = new Set(data1.suggestions.map(s => s.id));

    // Generate Batch 2 (without force_fresh, strictly no repeats)
    const res2 = await fetch(`${baseUrl}/api/suggestions?limit=6&live=false`);
    assert.equal(res2.status, 200);
    const data2 = await res2.json();

    // Verify ZERO overlap between Batch 1 and Batch 2
    for (const item of data2.suggestions) {
      assert.ok(!batch1Ids.has(item.id), `Video ${item.id} was repeated in Batch 2!`);
    }
  });

  it("4. Watchlist preservation: adding to watchlist persists across regenerations", async () => {
    // Add item to watchlist
    const addRes = await fetch(`${baseUrl}/api/watchlist`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        id: "watch-test-123",
        title: "Building an ESP32 E-Ink Weather Glass",
        channel: "Maker Lab",
        duration: "14:20",
        topic_id: "esp32-eink"
      })
    });
    assert.equal(addRes.status, 201);

    // Call suggestion regeneration
    const regenRes = await fetch(`${baseUrl}/api/suggestions/regenerate`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ limit: 4, fetchLive: false })
    });
    assert.equal(regenRes.status, 200);

    // Verify watchlist still contains the saved item!
    const wlRes = await fetch(`${baseUrl}/api/watchlist`);
    assert.equal(wlRes.status, 200);
    const wlData = await wlRes.json();
    const found = wlData.items.find(i => i.video_id === "watch-test-123");
    assert.ok(found, "Saved watchlist item must be preserved after regeneration!");
    assert.equal(found.title, "Building an ESP32 E-Ink Weather Glass");
    assert.equal(found.watched, 0);

    // Toggle watched state
    const toggleRes = await fetch(`${baseUrl}/api/watchlist/watch-test-123/toggle`, { method: "PATCH" });
    assert.equal(toggleRes.status, 200);
    const toggled = await toggleRes.json();
    assert.equal(toggled.watched, 1);

    // Delete from watchlist
    const delRes = await fetch(`${baseUrl}/api/watchlist/watch-test-123`, { method: "DELETE" });
    assert.equal(delRes.status, 200);
    const checkRes = await fetch(`${baseUrl}/api/watchlist`);
    const checkData = await checkRes.json();
    assert.ok(!checkData.items.some(i => i.video_id === "watch-test-123"));
  });

  it("5. Feedback steering: Thumbs Up boosts topic weight and Thumbs Down reduces it", async () => {
    const topicBefore = app.db.getTopicById("specialty-espresso");
    const weightBefore = topicBefore.weight;

    // Send Thumbs Up
    const upRes = await fetch(`${baseUrl}/api/feedback`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        videoId: "xK3vM9p0s2Q",
        action: "thumbs_up",
        channel: "James Hoffmann",
        topicId: "specialty-espresso"
      })
    });
    assert.equal(upRes.status, 200);

    const topicAfterUp = app.db.getTopicById("specialty-espresso");
    assert.ok(topicAfterUp.weight > weightBefore, "Thumbs up should increase topic weight");

    // Send Thumbs Down
    const downRes = await fetch(`${baseUrl}/api/feedback`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        videoId: "xK3vM9p0s2Q",
        action: "thumbs_down",
        channel: "James Hoffmann",
        topicId: "specialty-espresso"
      })
    });
    assert.equal(downRes.status, 200);

    const topicAfterDown = app.db.getTopicById("specialty-espresso");
    assert.ok(topicAfterDown.weight < topicAfterUp.weight, "Thumbs down should decrease topic weight");
  });

  it("6. Big Nope: permanently blacklists channel and video from suggestions", async () => {
    const nopeChannel = "Catspit Productions";
    const nopeVideoId = "mK9vX2t4w1L";

    const nopeRes = await fetch(`${baseUrl}/api/feedback`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        videoId: nopeVideoId,
        action: "big_nope",
        channel: nopeChannel,
        topicId: "vintage-screenprint"
      })
    });
    assert.equal(nopeRes.status, 200);

    // Verify it is in nopes table
    const nopesRes = await fetch(`${baseUrl}/api/nopes`);
    const nopesData = await nopesRes.json();
    assert.ok(nopesData.nopes.some(n => n.target.toLowerCase() === nopeChannel.toLowerCase()));
    assert.ok(nopesData.nopes.some(n => n.target === nopeVideoId));

    // Verify database isNoped check
    assert.ok(app.db.isNoped(nopeVideoId, nopeChannel));

    // Verify subsequent suggestions NEVER include this channel or video
    const sugRes = await fetch(`${baseUrl}/api/suggestions?force_fresh=true&live=false&limit=20`);
    const sugData = await sugRes.json();
    const hasNoped = sugData.suggestions.some(s => s.id === nopeVideoId || s.channel === nopeChannel);
    assert.equal(hasNoped, false, "Big Noped content must never appear in suggestions!");
  });

  it("7. Tuning API: reset seen history clears seen count", async () => {
    const tuningBefore = await (await fetch(`${baseUrl}/api/tuning`)).json();
    assert.ok(tuningBefore.seenCount > 0);

    const resetRes = await fetch(`${baseUrl}/api/tuning/reset-seen`, { method: "POST" });
    assert.equal(resetRes.status, 200);

    const tuningAfter = await (await fetch(`${baseUrl}/api/tuning`)).json();
    assert.equal(tuningAfter.seenCount, 0, "Seen count must be 0 after reset");
  });
});