const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const os = require('node:os');
const path = require('node:path');

const dbPath = path.join(os.tmpdir(), `bill-tracker-category-reorder-test-${process.pid}.sqlite`);
process.env.DB_PATH = dbPath;

const { getDb, closeDb } = require('../db/database');

function createUser(db, suffix) {
  return db.prepare(`
    INSERT INTO users (username, password_hash, role, active, email, created_at, updated_at)
    VALUES (?, 'x', 'user', 1, ?, datetime('now'), datetime('now'))
  `).run(`category-reorder-${suffix}`, `category-reorder-${suffix}@local`).lastInsertRowid;
}

function createCategory(db, userId, name) {
  return db.prepare(`
    INSERT INTO categories (user_id, name)
    VALUES (?, ?)
  `).run(userId, name).lastInsertRowid;
}

function callCategoriesRoute(routePath, method, { userId, params = {}, body = {} }) {
  const categoriesRouter = require('../routes/categories');
  const layer = categoriesRouter.stack.find(item => item.route?.path === routePath && item.route.methods[method]);
  assert.ok(layer, `route ${method.toUpperCase()} ${routePath} should exist`);
  const handler = layer.route.stack[0].handle;

  return new Promise((resolve, reject) => {
    const req = {
      body,
      params,
      user: { id: userId, role: 'user' },
    };
    const res = {
      statusCode: 200,
      status(code) {
        this.statusCode = code;
        return this;
      },
      json(data) {
        resolve({ status: this.statusCode, data });
      },
    };
    try {
      handler(req, res);
    } catch (err) {
      reject(err);
    }
  });
}

test.after(() => {
  closeDb();
  for (const suffix of ['', '-wal', '-shm']) {
    fs.rmSync(`${dbPath}${suffix}`, { force: true });
  }
});

test('category reorder endpoint persists category order for the current user', async () => {
  const db = getDb();
  const userId = createUser(db, 'owner');
  const food = createCategory(db, userId, 'Food');
  const loans = createCategory(db, userId, 'Loans');
  const utilities = createCategory(db, userId, 'Utilities');

  const response = await callCategoriesRoute('/reorder', 'put', {
    userId,
    body: {
      [utilities]: 0,
      [food]: 1,
      [loans]: 2,
    },
  });

  assert.equal(response.status, 200);
  assert.equal(response.data.success, true);

  const ordered = await callCategoriesRoute('/', 'get', { userId });
  assert.deepEqual(
    ordered.data.filter(cat => [food, loans, utilities].includes(cat.id)).map(cat => cat.id),
    [utilities, food, loans],
  );
});

test('category reorder rejects categories outside the current user scope', async () => {
  const db = getDb();
  const ownerId = createUser(db, 'scoped-owner');
  const otherId = createUser(db, 'scoped-other');
  const ownerCategory = createCategory(db, ownerId, 'Owner Category');
  const otherCategory = createCategory(db, otherId, 'Other Category');

  const response = await callCategoriesRoute('/reorder', 'put', {
    userId: ownerId,
    body: {
      [ownerCategory]: 0,
      [otherCategory]: 1,
    },
  });

  assert.equal(response.status, 404);
});