import { test } 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 { createCctvCatalog } from '../../server/providers/cctv/catalog.js';
import {
  DEFAULT_WSDOT_MAX_SOURCES,
  WSDOT_CAMERAS_URL,
  WSDOT_MAX_CATALOG_BYTES,
} from '../../server/providers/cctv/constants.js';
import {
  loadWsdotSourcesFromOpenData,
  webMercatorToWgs84,
} from '../../server/providers/cctv/sources.js';

/** Set (or, for `undefined`, delete) environment variables for one test. */
function withEnv(t, env) {
  for (const [name, value] of Object.entries(env)) {
    const previous = process.env[name];
    t.after(() => {
      if (previous === undefined) delete process.env[name];
      else process.env[name] = previous;
    });
    if (value === undefined) delete process.env[name];
    else process.env[name] = value;
  }
}

/** Silence the loaders' progress and failure logging. */
function quiet(t) {
  t.mock.method(console, 'log', () => {});
  t.mock.method(console, 'warn', () => {});
}

/** Web Mercator metres for a WGS84 coordinate (inverse of the loader's math). */
function mercator(lat, lon) {
  const R = 6378137;
  return {
    x: (lon * Math.PI * R) / 180,
    y: R * Math.log(Math.tan(Math.PI / 4 + (lat * Math.PI) / 360)),
  };
}

/** A `Cameras.json` point feature carrying the fields the loader reads. */
function wsdotFeature(id, lat, lon, overrides = {}) {
  const { attributes = {}, geometry } = overrides;
  return {
    attributes: {
      CameraID: id,
      CameraTitle: `Camera ${id}`,
      CompassDirection: 'N',
      ImageURL: `https://images.wsdot.wa.gov/nw/${id}.jpg`,
      ...attributes,
    },
    geometry: geometry === undefined ? mercator(lat, lon) : geometry,
  };
}

/** Serialize a payload for the mocked fetch as raw Windows-1252 bytes. */
function cp1252Response(payload) {
  const text = JSON.stringify(payload);
  const bytes = new Uint8Array(text.length);
  for (let i = 0; i < text.length; i += 1) {
    const code = text.charCodeAt(i);
    // U+2013 EN DASH is 0x96 in Windows-1252 — the byte the live feed ships.
    bytes[i] = code === 0x2013 ? 0x96 : code;
  }
  return new Response(bytes, {
    headers: { 'Content-Type': 'application/json' },
  });
}

test('webMercatorToWgs84 recovers WGS84 degrees from layer geometry', () => {
  // Real feature from the live layer: I-5 at the Interstate Bridge.
  const { lat, lon } = webMercatorToWgs84(-13656007.102, 5719738.545);
  assert.ok(Math.abs(lat - 45.62) < 0.05, `lat ${lat}`);
  assert.ok(Math.abs(lon - -122.675) < 0.05, `lon ${lon}`);
});

test('WSDOT loader keeps official-host cameras and maps compass directions', async (t) => {
  quiet(t);
  withEnv(t, { CCTV_WSDOT_MAX_SOURCES: undefined });
  const requested = [];
  t.mock.method(globalThis, 'fetch', async (url) => {
    requested.push(String(url));
    return cp1252Response({
      features: [
        wsdotFeature(1001, 47.6097, -122.3331, {
          attributes: {
            // The 0x2013 below is serialized as the feed's 0x96 byte.
            CameraTitle: 'I-5 – Seattle, looking south',
            CompassDirection: 'S',
          },
        }),
        wsdotFeature(9059, 47.66, -117.43, {
          attributes: { CompassDirection: 'B' },
        }),
        // Partner-hosted frame (Oregon DOT): skipped, never proxied.
        wsdotFeature(1002, 45.62, -122.675, {
          attributes: {
            ImageURL: 'https://www.tripcheck.com/RoadCams/cams/bridge.jpg',
          },
        }),
        // Bad rows: non-integer id, missing geometry, out-of-state point.
        wsdotFeature('1003', 47.6, -122.3),
        wsdotFeature(1004, 47.6, -122.3, { geometry: null }),
        wsdotFeature(1005, 34.05, -118.24),
      ],
    });
  });

  const cameras = await loadWsdotSourcesFromOpenData();

  assert.deepEqual(requested, [WSDOT_CAMERAS_URL]);
  // Exactly the two valid official-host cameras survive; the partner-hosted
  // frame and the malformed rows are dropped.
  assert.deepEqual(cameras.map((camera) => camera.id).sort(), [
    'wsdot-1001',
    'wsdot-9059',
  ]);

  const seattle = cameras.find((camera) => camera.id === 'wsdot-1001');
  assert.equal(seattle.name, 'I-5 – Seattle, looking south');
  assert.equal(seattle.provider, 'WSDOT');
  assert.equal(seattle.url, 'https://images.wsdot.wa.gov/nw/1001.jpg');
  assert.equal(seattle.snapshotUrl, seattle.url);
  assert.equal(seattle.feedType, 'image');
  assert.equal(seattle.headingDeg, 180);
  assert.equal(seattle.headingConfidence, 'high');
  assert.equal(seattle.fovDeg, 56);
  assert.ok(Math.abs(seattle.lat - 47.6097) < 0.001);
  assert.ok(Math.abs(seattle.lon - -122.3331) < 0.001);

  // `B` (both directions) carries no single facing: id-hash fallback at low
  // confidence, with the low-confidence pose personality.
  const spokane = cameras.find((camera) => camera.id === 'wsdot-9059');
  assert.equal(spokane.headingConfidence, 'low');
  assert.equal(spokane.fovDeg, 44);
  assert.ok(spokane.headingDeg >= 0 && spokane.headingDeg < 360);
});

test('WSDOT loader maps every CompassDirection code', async (t) => {
  quiet(t);
  withEnv(t, { CCTV_WSDOT_MAX_SOURCES: undefined });
  const codes = {
    N: 0,
    NE: 45,
    E: 90,
    SE: 135,
    S: 180,
    SW: 225,
    W: 270,
    NW: 315,
    // Lower-case and padded codes are the same code.
    ' nw ': 315,
  };
  // The live feed's no-facing codes, plus an unknown one.
  const noFacing = ['B', 'O', null, 'BW'];
  const entries = [...Object.keys(codes), ...noFacing];
  t.mock.method(globalThis, 'fetch', async () =>
    cp1252Response({
      features: entries.map((code, i) =>
        wsdotFeature(3000 + i, 47.0 + i * 0.05, -122.9 + i * 0.05, {
          attributes: { CompassDirection: code },
        }),
      ),
    }),
  );

  const cameras = await loadWsdotSourcesFromOpenData();
  const byId = new Map(cameras.map((camera) => [camera.id, camera]));
  entries.forEach((code, i) => {
    const camera = byId.get(`wsdot-${3000 + i}`);
    if (code in codes) {
      assert.equal(camera.headingDeg, codes[code], `heading for ${code}`);
      assert.equal(camera.headingConfidence, 'high', `confidence for ${code}`);
      assert.equal(camera.fovDeg, 56, `pose personality for ${code}`);
    } else {
      assert.equal(camera.headingConfidence, 'low', `confidence for ${code}`);
      assert.equal(camera.fovDeg, 44, `pose personality for ${code}`);
    }
  });
});

test('WSDOT loader honors the max-sources cap', async (t) => {
  quiet(t);
  withEnv(t, { CCTV_WSDOT_MAX_SOURCES: '8' });
  const features = [];
  for (let i = 0; i < 24; i += 1) {
    features.push(wsdotFeature(2000 + i, 47.0 + i * 0.05, -122.9 + i * 0.05));
  }
  t.mock.method(globalThis, 'fetch', async () => cp1252Response({ features }));

  const cameras = await loadWsdotSourcesFromOpenData();
  assert.equal(cameras.length, 8);
});

test('WSDOT loader defaults its cap and survives upstream failure', async (t) => {
  quiet(t);
  withEnv(t, { CCTV_WSDOT_MAX_SOURCES: undefined });
  assert.equal(DEFAULT_WSDOT_MAX_SOURCES, 250);

  t.mock.method(
    globalThis,
    'fetch',
    async () => new Response('', { status: 503 }),
  );
  assert.deepEqual(await loadWsdotSourcesFromOpenData(), []);

  t.mock.method(globalThis, 'fetch', async () => {
    throw new Error('network down');
  });
  assert.deepEqual(await loadWsdotSourcesFromOpenData(), []);
});

test('the catalog fetch refuses a redirect and cancels its body', async (t) => {
  quiet(t);
  // A redirect is never followed, and its still-open body is cancelled.
  const seen = [];
  const state = { cancelled: false };
  t.mock.method(globalThis, 'fetch', async (url, init) => {
    seen.push([String(url), init.redirect]);
    const body = new ReadableStream({
      start(controller) {
        controller.enqueue(new TextEncoder().encode('{'));
      },
      cancel() {
        state.cancelled = true;
      },
    });
    return new Response(body, {
      status: 302,
      headers: { location: 'https://evil.example/Cameras.json' },
    });
  });
  assert.deepEqual(await loadWsdotSourcesFromOpenData(), []);
  assert.deepEqual(seen, [[WSDOT_CAMERAS_URL, 'manual']]);
  assert.equal(state.cancelled, true, 'the redirect body is cancelled');
});

test('the catalog fetch refuses a body over the byte cap', async (t) => {
  quiet(t);
  // A valid catalog padded past the cap is refused rather than buffered.
  t.mock.method(globalThis, 'fetch', async () => {
    const text = JSON.stringify({
      features: [wsdotFeature(1001, 47.6097, -122.3331)],
    });
    const padded = text + ' '.repeat(WSDOT_MAX_CATALOG_BYTES);
    return new Response(
      new ReadableStream({
        start(controller) {
          controller.enqueue(new TextEncoder().encode(padded));
          controller.close();
        },
      }),
      { headers: { 'Content-Type': 'application/json' } },
    );
  });
  assert.deepEqual(await loadWsdotSourcesFromOpenData(), []);
});

test('CCTV_WSDOT_ENABLED=0 skips the WSDOT request', async (t) => {
  quiet(t);
  const sourceRoot = fs.mkdtempSync(
    path.join(os.tmpdir(), 'gev-cctv-catalog-'),
  );
  t.after(() => fs.rmSync(sourceRoot, { recursive: true, force: true }));
  withEnv(t, {
    CCTV_SOURCES_FILE: undefined,
    CCTV_SOURCES_JSON: undefined,
    CCTV_FORCE_AUSTIN: undefined,
    CCTV_PREFER_AUSTIN: undefined,
    CCTV_MAX_SOURCES: undefined,
    CCTV_WSDOT_ENABLED: undefined,
    CCTV_WSDOT_MAX_SOURCES: undefined,
  });
  const requested = [];
  t.mock.method(globalThis, 'fetch', async (url) => {
    requested.push(String(url));
    // Every other live pack is down; only WSDOT answers.
    return String(url) === WSDOT_CAMERAS_URL
      ? cp1252Response({ features: [wsdotFeature(1001, 47.6097, -122.3331)] })
      : new Response('unavailable', { status: 503 });
  });

  const sources = await createCctvCatalog({ sourceRoot })();
  assert.deepEqual(
    sources.map((source) => source.id),
    ['wsdot-1001'],
  );

  process.env.CCTV_WSDOT_ENABLED = '0';
  requested.length = 0;
  assert.deepEqual(await createCctvCatalog({ sourceRoot })(), []);
  assert.ok(requested.length > 0, 'the other live packs still load');
  assert.equal(
    requested.includes(WSDOT_CAMERAS_URL),
    false,
    'a disabled pack makes no request',
  );
});