// Shop page integration tests: verify page loads and requires auth.
const { describe, it, before, after } = require('node:test');
const assert = require('node:assert/strict');
const { setup, teardown, cleanup } = require('../helpers');

/**
 * Register a user and log them in, returning the session cookie string.
 */
async function registerAndLogin(baseUrl, username, password) {
  await fetch(`${baseUrl}/api/auth/register`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ username, password }),
  });

  const res = await fetch(`${baseUrl}/api/auth/login`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ username, password }),
  });
  assert.equal(res.status, 200);
  const json = await res.json();
  assert.equal(json.ok, true);

  const setCookie = res.headers.get('set-cookie');
  assert.ok(setCookie, 'Login should set a session cookie');
  return setCookie.split(';')[0];
}

function authHeaders(cookie) {
  return { Cookie: cookie };
}

describe('shop page', () => {
  let baseUrl, userSeq = 0;

  before(async () => {
    baseUrl = await setup();
  });

  after(async () => {
    await teardown(); cleanup();
  });

  /**
   * Register, login, create a character, optionally tweak DB fields.
   */
  async function setupHero(overrides = {}) {
    userSeq += 1;
    const username = `shoppu${userSeq}`;
    const cookie = await registerAndLogin(baseUrl, username, 'password123');

    const charRes = await fetch(`${baseUrl}/api/character`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', ...authHeaders(cookie) },
      body: JSON.stringify({ name: `ShopTest${userSeq}`, class: 'warrior' }),
    });
    assert.equal(charRes.status, 201);
    const charJson = await charRes.json();
    const characterId = charJson.data.character.id;

    const db = require('../../src/db').getDb();
    const cols = Object.keys(overrides);
    if (cols.length) {
      db.prepare(`UPDATE characters SET ${cols.map((c) => `${c} = ?`).join(', ')} WHERE id = ?`)
        .run(...Object.values(overrides), characterId);
    }

    return { cookie, characterId };
  }

  /** Grant an item to a character's inventory. */
  function grantItem(characterId, itemId, quantity = 1) {
    const db = require('../../src/db').getDb();
    const NOW = 1_700_000_000_000;
    db.prepare(
      'INSERT INTO inventory (character_id, item_id, quantity, equipped_slot, acquired_at) VALUES (?, ?, ?, NULL, ?)'
    ).run(characterId, itemId, quantity, NOW);
  }

  // ─── Shop page loads ──────────────────────────────────────────────────

  it('GET /shop returns stock with character info', async () => {
    const { cookie } = await setupHero({ gold: 500 });

    const res = await fetch(`${baseUrl}/api/shop`, { headers: authHeaders(cookie) });
    const body = await res.json();

    assert.equal(res.status, 200);
    assert.equal(body.ok, true);
    assert.ok(Array.isArray(body.data.stock));
    assert.ok(body.data.character, 'should include character info');
    assert.equal(body.data.character.gold, 500);
    assert.equal(body.data.character.level, 1);
  });

  // ─── Level gating ─────────────────────────────────────────────────────

  it('filters high-level items from shop stock (levelOk)', async () => {
    const { cookie } = await setupHero({ gold: 9999, level: 1 });

    const res = await fetch(`${baseUrl}/api/shop`, { headers: authHeaders(cookie) });
    const body = await res.json();

    // All purchasable items should be level-Ok for level-1 hero
    const purchasable = body.data.stock.filter((i) => i.buyPrice > 0);
    for (const item of purchasable) {
      assert.equal(item.levelOk, true, `${item.name} should be levelOk for level-1 hero`);
    }
  });

  it('shows levelOk=false for high-level items when visible', async () => {
    // Use a level-5 hero; high-level items (Lv.10+) should be levelOk=false
    const { cookie } = await setupHero({ gold: 9999, level: 5 });

    const res = await fetch(`${baseUrl}/api/shop`, { headers: authHeaders(cookie) });
    const body = await res.json();

    // Items requiring level 10+ should NOT appear for a level-5 hero
    // (the backend filters them out entirely via WHERE clause)
    const highLevelItems = body.data.stock.filter((i) => i.levelReq >= 10);
    assert.equal(highLevelItems.length, 0);
  });

  // ─── Sell pricing ─────────────────────────────────────────────────────

  it('includes sellPrice for materials', async () => {
    const { cookie } = await setupHero({ gold: 100, level: 5 });

    const res = await fetch(`${baseUrl}/api/shop`, { headers: authHeaders(cookie) });
    const body = await res.json();

    const materials = body.data.stock.filter((i) => i.buyPrice === 0);
    assert.ok(materials.length > 0, 'should have materials');
    for (const mat of materials) {
      assert.ok(typeof mat.sellPrice === 'number', `${mat.name} should have sellPrice`);
      assert.ok(mat.sellPrice >= 1, `${mat.name} sellPrice >= 1`);
    }
  });

  // ─── Buy/sell round-trip ──────────────────────────────────────────────

  it('buy then sell: gold decreases (spread)', async () => {
    const { cookie, characterId } = await setupHero({ gold: 500 });

    // Buy Minor Healing Potion (item 14, buy_price 15)
    const buyRes = await fetch(`${baseUrl}/api/shop/buy`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', ...authHeaders(cookie) },
      body: JSON.stringify({ itemId: 14, quantity: 1 }),
    });
    const buyBody = await buyRes.json();
    assert.equal(buyRes.status, 200);
    assert.equal(buyBody.ok, true);
    const afterBuyGold = buyBody.data.character.gold; // 500 - 15 = 485
    assert.equal(afterBuyGold, 485);

    // Sell Rat Tail (item 17, common material, min_level 1) — must grant first
    grantItem(characterId, 17, 1);

    const sellRes = await fetch(`${baseUrl}/api/shop/sell`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', ...authHeaders(cookie) },
      body: JSON.stringify({ itemId: 17, quantity: 1 }),
    });
    const sellBody = await sellRes.json();
    assert.equal(sellRes.status, 200);
    assert.equal(sellBody.ok, true);
    const afterSellGold = sellBody.data.character.gold;

    // Common material at level 1: floor(2 * 1 / 1) = 2
    assert.equal(afterSellGold, 487);
    assert.ok(afterSellGold < 500, 'round-trip should lose gold');
  });
});