import { test, beforeEach, afterEach } from 'node:test';
import assert from 'node:assert/strict';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import request from 'supertest';
import { createApp } from '../src/server/app.js';

let tmpDir;
let app;

beforeEach(() => {
  tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'tripplan-checklist-sugg-'));
  app = createApp({ dbPath: path.join(tmpDir, 'test.db'), sessionSecret: 'test-secret' });
});

afterEach(() => {
  try {
    if (app.locals.db) app.locals.db.close();
  } catch {
    /* ignore */
  }
  fs.rmSync(tmpDir, { recursive: true, force: true });
});

async function createAccount() {
  const agent = request.agent(app);
  const res = await agent.post('/api/auth/account').send({});
  assert.equal(res.status, 201);
  return { agent, user: res.body.user };
}

async function makeTrip(agent, overrides = {}) {
  return (await agent.post('/api/trips').send({
    name: 'S', start_date: '2026-08-01', end_date: '2026-08-10', ...overrides,
  })).body.trip;
}

function findSuggestion(suggestions, key) {
  return suggestions.find((s) => s.key === key);
}

// ---------------------------------------------------------------------------
// Determinism & `added`
// ---------------------------------------------------------------------------

test('suggestions: two identical GETs return identical arrays', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent);
  await agent.post(`/api/trips/${trip.id}/entries`).send({ date: '2026-08-01', type: 'flight', title: 'F' });

  const first = await agent.get(`/api/trips/${trip.id}/checklist/suggestions`);
  const second = await agent.get(`/api/trips/${trip.id}/checklist/suggestions`);
  assert.equal(first.status, 200);
  assert.deepEqual(first.body.suggestions, second.body.suggestions);
  assert.deepEqual(first.body.context, second.body.context);
});

test('suggestions: `added` is false before the item exists, true after', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent);

  const before = await agent.get(`/api/trips/${trip.id}/checklist/suggestions`);
  assert.equal(findSuggestion(before.body.suggestions, 'doc-passport').added, false);

  const add = await agent.post(`/api/trips/${trip.id}/checklist/suggestions`).send({ keys: ['doc-passport'] });
  assert.equal(add.status, 201);

  const after = await agent.get(`/api/trips/${trip.id}/checklist/suggestions`);
  assert.equal(findSuggestion(after.body.suggestions, 'doc-passport').added, true);
});

// ---------------------------------------------------------------------------
// Bulk-add
// ---------------------------------------------------------------------------

test('bulk-add: creates items with suggestion_key set, in current suggestion order', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent);

  const res = await agent.post(`/api/trips/${trip.id}/checklist/suggestions`).send({
    keys: ['doc-cards-cash', 'doc-passport'],
  });
  assert.equal(res.status, 201);
  assert.equal(res.body.created.length, 2);
  assert.equal(res.body.skipped.length, 0);
  // doc-passport precedes doc-cards-cash in the rule table -> current suggestion order.
  assert.deepEqual(res.body.created.map((i) => i.suggestion_key), ['doc-passport', 'doc-cards-cash']);
  assert.ok(res.body.created.every((i) => i.category === 'Documents'));
  assert.ok(res.body.created.every((i) => i.user_id === null), 'shared by default');
});

test('bulk-add: already-present keys go to skipped rather than duplicating', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent);

  const first = await agent.post(`/api/trips/${trip.id}/checklist/suggestions`).send({ keys: ['doc-passport'] });
  assert.equal(first.status, 201);

  const second = await agent.post(`/api/trips/${trip.id}/checklist/suggestions`).send({
    keys: ['doc-passport', 'toiletries-toothbrush'],
  });
  assert.equal(second.status, 201);
  assert.deepEqual(second.body.skipped, ['doc-passport']);
  assert.equal(second.body.created.length, 1);
  assert.equal(second.body.created[0].suggestion_key, 'toiletries-toothbrush');

  const list = (await agent.get(`/api/trips/${trip.id}/checklist`)).body.items;
  assert.equal(list.filter((i) => i.suggestion_key === 'doc-passport').length, 1, 'not duplicated');
});

test('bulk-add: unknown key -> 400', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent);
  const res = await agent.post(`/api/trips/${trip.id}/checklist/suggestions`).send({ keys: ['not-a-real-key'] });
  assert.equal(res.status, 400);
  assert.deepEqual(res.body, { error: 'unknown suggestion key: not-a-real-key' });
});

test('bulk-add: bad `keys` payloads -> 400', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent);
  const base = `/api/trips/${trip.id}/checklist/suggestions`;

  assert.equal((await agent.post(base).send({ keys: [] })).status, 400);
  assert.equal((await agent.post(base).send({ keys: 'doc-passport' })).status, 400);
  assert.equal((await agent.post(base).send({})).status, 400);
  assert.equal((await agent.post(base).send({ keys: [123] })).status, 400);
  const tooMany = Array.from({ length: 61 }, () => 'doc-passport');
  assert.equal((await agent.post(base).send({ keys: tooMany })).status, 400);
});

// ---------------------------------------------------------------------------
// Rule coverage
// ---------------------------------------------------------------------------

test('rules: clothing qty scales with nights, capped at 10 for a 20-night trip', async () => {
  const { agent } = await createAccount();
  // 21 days inclusive Aug 1 -> Aug 21 = 20 nights.
  const trip = await makeTrip(agent, { start_date: '2026-08-01', end_date: '2026-08-21' });

  const res = await agent.get(`/api/trips/${trip.id}/checklist/suggestions`);
  assert.equal(res.body.context.nights, 20);
  assert.equal(findSuggestion(res.body.suggestions, 'clothing-tshirts').qty, 10);
  assert.equal(findSuggestion(res.body.suggestions, 'clothing-underwear').qty, 10);
  assert.equal(findSuggestion(res.body.suggestions, 'clothing-socks').qty, 10);
});

test('rules: a flight entry triggers liquids and power-bank suggestions', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent);

  const before = (await agent.get(`/api/trips/${trip.id}/checklist/suggestions`)).body.suggestions;
  assert.equal(findSuggestion(before, 'toiletries-liquids-100ml'), undefined);
  assert.equal(findSuggestion(before, 'electronics-power-bank'), undefined);

  await agent.post(`/api/trips/${trip.id}/entries`).send({ date: '2026-08-01', type: 'flight', title: 'F' });

  const after = (await agent.get(`/api/trips/${trip.id}/checklist/suggestions`)).body.suggestions;
  assert.ok(findSuggestion(after, 'toiletries-liquids-100ml'));
  assert.ok(findSuggestion(after, 'electronics-power-bank'));
});

test('rules: a rental entry triggers driving-licence and IDP suggestions', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent);

  const before = (await agent.get(`/api/trips/${trip.id}/checklist/suggestions`)).body.suggestions;
  assert.equal(findSuggestion(before, 'doc-driving-licence'), undefined);
  assert.equal(findSuggestion(before, 'doc-idp'), undefined);

  await agent.post(`/api/trips/${trip.id}/entries`).send({ date: '2026-08-01', type: 'rental', title: 'Car' });

  const after = (await agent.get(`/api/trips/${trip.id}/checklist/suggestions`)).body.suggestions;
  assert.ok(findSuggestion(after, 'doc-driving-licence'));
  assert.ok(findSuggestion(after, 'doc-idp'));
});

test('rules: a ferry transport entry triggers motion-sickness suggestion', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent);

  const before = (await agent.get(`/api/trips/${trip.id}/checklist/suggestions`)).body.suggestions;
  assert.equal(findSuggestion(before, 'health-motion-sickness'), undefined);

  await agent.post(`/api/trips/${trip.id}/entries`).send({
    date: '2026-08-01', type: 'transport', title: 'Ferry', transport_mode: 'ferry',
  });

  const after = (await agent.get(`/api/trips/${trip.id}/checklist/suggestions`)).body.suggestions;
  assert.ok(findSuggestion(after, 'health-motion-sickness'));
});

test('rules: 3+ stays trigger packing cubes', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent);
  const base = `/api/trips/${trip.id}/entries`;

  await agent.post(base).send({ date: '2026-08-01', type: 'stay', title: 'A' });
  await agent.post(base).send({ date: '2026-08-03', type: 'stay', title: 'B' });

  const twoStays = (await agent.get(`/api/trips/${trip.id}/checklist/suggestions`)).body.suggestions;
  assert.equal(findSuggestion(twoStays, 'extras-packing-cubes'), undefined);

  await agent.post(base).send({ date: '2026-08-05', type: 'stay', title: 'C' });

  const threeStays = (await agent.get(`/api/trips/${trip.id}/checklist/suggestions`)).body.suggestions;
  assert.ok(findSuggestion(threeStays, 'extras-packing-cubes'));
});

// ---------------------------------------------------------------------------
// Climate regression: tropical winter destination must not also be tagged cold
// ---------------------------------------------------------------------------

test('climate: a tropical stop during northern winter is tropical but NOT cold (no warm-layers/hat-gloves)', async () => {
  const { agent } = await createAccount();
  // December trip -> northern winter months.
  const trip = await makeTrip(agent, { start_date: '2026-12-05', end_date: '2026-12-15' });
  await agent.post(`/api/trips/${trip.id}/entries`).send({
    date: '2026-12-06', type: 'activity', title: 'Grand Palace',
    location_name: 'Bangkok, Thailand', lat: 13.7, lng: 100.5,
  });

  const res = await agent.get(`/api/trips/${trip.id}/checklist/suggestions`);
  assert.deepEqual(res.body.context.climate, ['tropical']);
  assert.ok(findSuggestion(res.body.suggestions, 'clothing-rain-jacket'));
  assert.ok(findSuggestion(res.body.suggestions, 'toiletries-sun-cream'));
  assert.equal(findSuggestion(res.body.suggestions, 'clothing-warm-layers'), undefined);
  assert.equal(findSuggestion(res.body.suggestions, 'clothing-hat-gloves'), undefined);
});

// Real bundled airports.json coordinates, so this exercises the actual
// code -> country lookup rather than made-up lat/lng.
const FRA = { code: 'FRA', lat: 50.026706, lng: 8.55835 }; // Frankfurt, Germany
const BKK = { code: 'BKK', lat: 13.6811, lng: 100.747002 }; // Bangkok, Thailand
const MUC = { code: 'MUC', lat: 48.353802, lng: 11.7861 }; // Munich, Germany

test('climate/countries: a flight\'s departure airport does not count, only each segment\'s arrival', async () => {
  const { agent } = await createAccount();
  // December trip, flying FROM cold Frankfurt TO tropical Bangkok for a beach
  // holiday. Only the arrival (Bangkok) should count for climate/countries;
  // Frankfurt as the mere departure point must not leak in as "cold"/"Germany".
  const trip = await makeTrip(agent, { start_date: '2026-12-05', end_date: '2026-12-15' });
  await agent.post(`/api/trips/${trip.id}/entries`).send({
    date: '2026-12-06', type: 'stay', title: 'Bangkok stay', location_name: 'Bangkok, Thailand',
  });
  await agent.post(`/api/trips/${trip.id}/entries`).send({
    date: '2026-12-05', type: 'flight', title: 'FRA-BKK',
    segments: [{ from: FRA, to: BKK }],
  });

  const res = await agent.get(`/api/trips/${trip.id}/checklist/suggestions`);
  assert.deepEqual(res.body.context.climate, ['tropical']);
  assert.deepEqual(res.body.context.countries, ['Thailand']);
  assert.equal(findSuggestion(res.body.suggestions, 'clothing-warm-layers'), undefined);
  assert.equal(findSuggestion(res.body.suggestions, 'clothing-hat-gloves'), undefined);

  // Adapter suggestion names Thailand's sockets rather than falling back to
  // the mixed/universal wording (which would happen if Germany leaked in).
  const adapter = findSuggestion(res.body.suggestions, 'electronics-adapter');
  assert.equal(adapter.text, 'Plug adapter (type A/B/C)');
  assert.equal(adapter.reason, 'Thailand uses type A/B/C sockets');
});

test('climate/countries: landing back in a cold place is still counted (arrival of a later segment)', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent, { start_date: '2026-12-05', end_date: '2026-12-15' });
  await agent.post(`/api/trips/${trip.id}/entries`).send({
    date: '2026-12-06', type: 'stay', title: 'Bangkok stay', location_name: 'Bangkok, Thailand',
  });
  await agent.post(`/api/trips/${trip.id}/entries`).send({
    date: '2026-12-05', type: 'flight', title: 'FRA-BKK',
    segments: [{ from: FRA, to: BKK }],
  });
  // Return leg: Bangkok -> Munich. Munich is only ever an arrival, never a
  // mere departure, so it must still register as cold/Germany.
  await agent.post(`/api/trips/${trip.id}/entries`).send({
    date: '2026-12-14', type: 'flight', title: 'BKK-MUC',
    segments: [{ from: BKK, to: MUC }],
  });

  const res = await agent.get(`/api/trips/${trip.id}/checklist/suggestions`);
  assert.deepEqual(res.body.context.climate.sort(), ['cold', 'tropical']);
  assert.deepEqual(res.body.context.countries, ['Thailand', 'Germany']);
  assert.ok(findSuggestion(res.body.suggestions, 'clothing-warm-layers'));
  assert.ok(findSuggestion(res.body.suggestions, 'clothing-hat-gloves'));
});

test('climate: a stop at lat 48 during northern winter IS cold', async () => {
  const { agent } = await createAccount();
  const trip = await makeTrip(agent, { start_date: '2026-12-05', end_date: '2026-12-15' });
  await agent.post(`/api/trips/${trip.id}/entries`).send({
    date: '2026-12-06', type: 'activity', title: 'Christmas market',
    location_name: 'Munich, Germany', lat: 48.1, lng: 11.6,
  });

  const res = await agent.get(`/api/trips/${trip.id}/checklist/suggestions`);
  assert.deepEqual(res.body.context.climate, ['cold']);
  assert.ok(findSuggestion(res.body.suggestions, 'clothing-warm-layers'));
  assert.ok(findSuggestion(res.body.suggestions, 'clothing-hat-gloves'));
  assert.equal(findSuggestion(res.body.suggestions, 'clothing-rain-jacket'), undefined);
});