import { computeTrackDistance, type GeoPoint } from '#shared/utils/geo';
import { beforeEach, describe, expect, it } from 'vitest';
import { newClient } from '../helpers/api';
import { resetDatabase } from '../helpers/database';
import {
  createHunt,
  createTeam,
  createUser,
  TEST_PASSWORD
} from '../helpers/factories';
import { prisma } from './setup';

beforeEach(resetDatabase);

const MINUTE = 60_000;
const DAY = 24 * 60 * 60 * 1000;

function point(lat: number, lon: number, recordedAt: Date, accuracy?: number) {
  return {
    lat,
    lon,
    recordedAt: recordedAt.toISOString(),
    ...(accuracy !== undefined ? { accuracy } : {})
  };
}

/** A small walk north along a meridian, one fix every 10 s (~11 m apart). */
function walk(count: number, startMs = Date.now() - count * 10_000) {
  return Array.from({ length: count }, (_, i) =>
    point(i * 0.0001, 0, new Date(startMs + i * 10_000), 5)
  );
}

async function seedTrackingHunt(
  ownerEmail: string,
  overrides: Parameters<typeof createHunt>[1] = {}
) {
  const creator = await createUser();
  const hunt = await createHunt(creator.id, {
    trackDistance: true,
    revealQuests: true,
    ...overrides
  });
  const owner = await createUser({ email: ownerEmail });
  const team = await createTeam(hunt.id, owner.id);
  return { hunt, owner, team };
}

async function loggedInClient(email: string) {
  const client = newClient();
  await client.login(email, TEST_PASSWORD);
  return client;
}

describe('track (POST /api/hunt/[huntId]/track)', () => {
  it('drops points without a session (2xx, nothing persisted)', async () => {
    const { hunt } = await seedTrackingHunt('owner@test.dev');

    const res = await newClient().post(`/api/hunt/${hunt.id}/track`, walk(3));

    expect(res.ok).toBe(true);
    expect(await prisma.trackPoint.count()).toBe(0);
    expect(await prisma.userTrack.count()).toBe(0);
  });

  it('drops points from an authenticated non-member (2xx, nothing persisted)', async () => {
    const { hunt } = await seedTrackingHunt('owner@test.dev');
    const loner = await createUser({ email: 'loner@test.dev' });

    const client = await loggedInClient('loner@test.dev');
    const res = await client.post(`/api/hunt/${hunt.id}/track`, walk(3));

    expect(res.ok).toBe(true);
    expect(await prisma.trackPoint.count({ where: { userId: loner.id } })).toBe(
      0
    );
    expect(await prisma.userTrack.count()).toBe(0);
  });

  it('drops points when hunt.trackDistance is false', async () => {
    const { hunt, owner } = await seedTrackingHunt('owner@test.dev', {
      trackDistance: false
    });

    const client = await loggedInClient('owner@test.dev');
    const res = await client.post(`/api/hunt/${hunt.id}/track`, walk(3));

    expect(res.ok).toBe(true);
    expect(await prisma.trackPoint.count({ where: { userId: owner.id } })).toBe(
      0
    );
    expect(await prisma.userTrack.count()).toBe(0);
  });

  it('drops points outside the time window', async () => {
    const { hunt, owner } = await seedTrackingHunt('owner@test.dev', {
      start: new Date(Date.now() - 2 * DAY),
      end: new Date(Date.now() - DAY)
    });

    const client = await loggedInClient('owner@test.dev');
    const res = await client.post(`/api/hunt/${hunt.id}/track`, walk(3));

    expect(res.ok).toBe(true);
    expect(await prisma.trackPoint.count({ where: { userId: owner.id } })).toBe(
      0
    );
    expect(await prisma.userTrack.count()).toBe(0);
  });

  it('persists a valid batch and derives the distance', async () => {
    const { hunt, owner } = await seedTrackingHunt('owner@test.dev');
    const batch = walk(4);

    const client = await loggedInClient('owner@test.dev');
    const res = await client.post(`/api/hunt/${hunt.id}/track`, batch);

    expect(res.ok).toBe(true);

    const points = await prisma.trackPoint.findMany({
      where: { userId: owner.id, huntId: hunt.id }
    });
    expect(points).toHaveLength(4);

    const track = await prisma.userTrack.findUniqueOrThrow({
      where: { userId_huntId: { userId: owner.id, huntId: hunt.id } }
    });
    const expected = computeTrackDistance(batch as GeoPoint[]);
    expect(expected).toBeGreaterThan(0);
    expect(track.distanceMeters).toBe(expected);
    expect(track.lastFixAt).not.toBeNull();
  });

  it('is idempotent when the same batch is re-sent', async () => {
    const { hunt, owner } = await seedTrackingHunt('owner@test.dev');
    const batch = walk(4);

    const client = await loggedInClient('owner@test.dev');
    await client.post(`/api/hunt/${hunt.id}/track`, batch);
    const first = await prisma.userTrack.findUniqueOrThrow({
      where: { userId_huntId: { userId: owner.id, huntId: hunt.id } }
    });

    await client.post(`/api/hunt/${hunt.id}/track`, batch);
    const second = await prisma.userTrack.findUniqueOrThrow({
      where: { userId_huntId: { userId: owner.id, huntId: hunt.id } }
    });

    expect(second.distanceMeters).toBe(first.distanceMeters);
  });

  it('truncates oversize batches but stays 2xx', async () => {
    const { hunt, owner } = await seedTrackingHunt('owner@test.dev');
    const batch = walk(600);

    const client = await loggedInClient('owner@test.dev');
    const res = await client.post(`/api/hunt/${hunt.id}/track`, batch);

    expect(res.ok).toBe(true);
    const count = await prisma.trackPoint.count({
      where: { userId: owner.id, huntId: hunt.id }
    });
    expect(count).toBeLessThanOrEqual(500);
    expect(count).toBe(500);
  });

  it('filters invalid points but keeps the valid ones', async () => {
    const { hunt, owner } = await seedTrackingHunt('owner@test.dev');
    const now = Date.now();
    const batch = [
      point(0, 0, new Date(now - 30_000), 5), // valid
      point(999, 0, new Date(now - 25_000), 5), // lat out of range
      point(0, 999, new Date(now - 24_000), 5), // lon out of range
      point(0.0001, 0, new Date(now + DAY), 5), // recordedAt in the future
      point(0.0002, 0, new Date(now - 2 * DAY - MINUTE), 5), // too old
      point(0.0003, 0, new Date(now - 22_000), -5), // negative accuracy
      point(0.0001, 0, new Date(now - 20_000), 5) // valid
    ];

    const client = await loggedInClient('owner@test.dev');
    const res = await client.post(`/api/hunt/${hunt.id}/track`, batch);

    expect(res.ok).toBe(true);
    const points = await prisma.trackPoint.findMany({
      where: { userId: owner.id, huntId: hunt.id }
    });
    expect(points).toHaveLength(2);
  });

  it('drops a malformed (non-array) body silently', async () => {
    const { hunt, owner } = await seedTrackingHunt('owner@test.dev');

    const client = await loggedInClient('owner@test.dev');
    const res = await client.post(`/api/hunt/${hunt.id}/track`, {
      not: 'an array'
    });

    expect(res.ok).toBe(true);
    expect(await prisma.trackPoint.count({ where: { userId: owner.id } })).toBe(
      0
    );
  });
});