import assert from 'node:assert/strict';
import { readFileSync } from 'node:fs';
import test from 'node:test';
import { readHouseplanProductionSource } from './houseplan-source.mjs';

import {
  COORDINATE_DECIMALS,
  DECOR_BOX_KINDS,
  LATTICE_GRID_N,
  LATTICE_NOISE_STEPS,
  canonicalizeConfigGeometry,
  canonicalizeConfigGeometryInPlace,
  canonicalizeLatticeCoordinate,
  canonicalizeLayoutGeometry,
  canonicalizeNumber,
  canonicalizePosition,
  formatLatticeShiftCm,
  latticeCanonicalizationReport,
} from '../test-build/coordinate-canonicalization.js';

const fixture = JSON.parse(readFileSync(
  new URL('./fixtures/coordinate-canonicalization.json', import.meta.url),
  'utf8',
));

test('frontend and backend share the scalar+lattice fixture contract (#291)', () => {
  assert.equal(COORDINATE_DECIMALS, fixture.decimals);
  const configBefore = structuredClone(fixture.configInput);
  const layoutBefore = structuredClone(fixture.layoutInput);

  const config = canonicalizeConfigGeometry(fixture.configInput);
  const layout = canonicalizeLayoutGeometry(fixture.layoutInput);

  assert.deepEqual(config, fixture.configExpected);
  assert.deepEqual(layout, fixture.layoutExpected);
  assert.deepEqual(fixture.configInput, configBefore, 'config input is immutable');
  assert.deepEqual(fixture.layoutInput, layoutBefore, 'layout input is immutable');
  assert.deepEqual(canonicalizeConfigGeometry(config), config, 'config is idempotent');
  assert.deepEqual(canonicalizeLayoutGeometry(layout), layout, 'layout is idempotent');
  assert.equal(Object.is(layout['rl:poly'].x, -0), false, 'negative zero becomes positive');
});

test('decor box catalog canonicalizes every box kind and preserves image metadata (#431)', () => {
  assert.deepEqual(DECOR_BOX_KINDS, fixture.boxKinds);

  const inputBoxes = fixture.configInput.spaces[0].decor
    .filter((item) => fixture.boxKinds.includes(item.kind));
  assert.deepEqual(
    inputBoxes.map((item) => item.kind).sort(),
    [...fixture.boxKinds].sort(),
    'the shared fixture covers the exact runtime box catalog',
  );

  const output = canonicalizeConfigGeometry(fixture.configInput);
  const outputById = new Map(output.spaces[0].decor.map((item) => [item.id, item]));
  const expectedById = new Map(fixture.configExpected.spaces[0].decor.map((item) => [item.id, item]));
  for (const input of inputBoxes) {
    const actual = outputById.get(input.id);
    const expected = expectedById.get(input.id);
    for (const field of ['x', 'y', 'w', 'h', 'angle']) {
      assert.equal(actual[field], expected[field], `${input.kind}.${field} is canonical`);
      assert.notEqual(actual[field], input[field], `${input.kind}.${field} exercises the barrier`);
    }
  }

  const inputImage = inputBoxes.find((item) => item.kind === 'image');
  const actualImage = outputById.get('image');
  for (const field of ['asset_id', 'opacity', 'flip_h', 'flip_v', 'future']) {
    assert.deepEqual(actualImage[field], inputImage[field], `image.${field} is preserved`);
  }

  const futureBox = {
    id: 'future', kind: 'future-box', x: 0.1000000004, y: 0.2000000006,
    w: 0.3000000004, h: 0.4000000006, angle: 12.1234567896,
  };
  const unknownResult = canonicalizeConfigGeometry({ spaces: [{ decor: [futureBox] }] });
  assert.deepEqual(unknownResult.spaces[0].decor[0], futureBox);
});

test('lattice report includes image box coordinates (#431)', () => {
  const node = 83 / 240;
  const noise = Number(node.toFixed(9));
  const report = latticeCanonicalizationReport({ spaces: [{
    id: 'floor', title: 'Floor', cell_cm: 5,
    decor: [{ id: 'image', kind: 'image', x: noise, y: node, w: noise, h: 0.06 }],
  }] });
  assert.equal(report.canonicalized, 2);
  assert.equal(report.far, 1);
  assert.equal(report.spaces.length, 1);
  assert.equal(report.spaces[0].canonicalized, 2);
  assert.equal(report.spaces[0].far, 1);
});

test('scalar canonicalization is symmetric and never snaps off-grid geometry (#224)', () => {
  assert.equal(canonicalizeNumber(1.2345678905), 1.234567891);
  assert.equal(canonicalizeNumber(-1.2345678905), -1.234567891);
  assert.equal(canonicalizeNumber(0.20833333333333334), 0.208333333);
  assert.ok(Math.abs(canonicalizeNumber(0.20833333333333334) - 0.20833333333333334) <= 5e-10);
  assert.equal(canonicalizeNumber(Number.NaN), Number.NaN);
  assert.equal(canonicalizeNumber(Number.POSITIVE_INFINITY), Number.POSITIVE_INFINITY);
});

test('all 4801 lattice nodes and their nine-decimal forms share exact bits (#291)', () => {
  assert.equal(LATTICE_GRID_N, 240);
  assert.equal(LATTICE_NOISE_STEPS, 1e-4);
  for (let k = -2400; k <= 2400; k++) {
    const node = k / LATTICE_GRID_N;
    const nineDecimal = Number(node.toFixed(COORDINATE_DECIMALS));
    assert.equal(canonicalizeLatticeCoordinate(node), node, `node ${k}`);
    assert.equal(canonicalizeLatticeCoordinate(nineDecimal), node, `stored node ${k}`);
    assert.equal(canonicalizeLatticeCoordinate(
      canonicalizeLatticeCoordinate(nineDecimal),
    ), node, `idempotent node ${k}`);
  }
  assert.equal(Object.is(canonicalizeLatticeCoordinate(-0), -0), false);
  assert.equal(canonicalizeLatticeCoordinate(0.06), 0.06);
  assert.equal(canonicalizeLatticeCoordinate(0.2875), 0.2875);
  assert.equal(canonicalizeLatticeCoordinate((1 + 0.999e-4) / 240), 1 / 240);
  assert.equal(canonicalizeLatticeCoordinate((1 + 1.001e-4) / 240), 0.004167084);
});

test('lattice report separates noise, far values and physical per-space maxima (#291)', () => {
  const node = 83 / 240;
  const noise = Number(node.toFixed(9));
  const report = latticeCanonicalizationReport({ spaces: [
    { id: 'quiet', title: 'Quiet', cell_cm: 1, rooms: [{ poly: [[0, 0], [0.06, 0]] }] },
    { id: 'touched', title: 'Touched', cell_cm: 10, rooms: [{ poly: [[noise, node], [0.06, 0]] }] },
  ] }, { marker: { s: 'touched', x: noise, y: 0 }, orphan: { x: noise, y: 0 } });
  assert.equal(report.canonicalized, 3);
  assert.equal(report.far, 2);
  assert.equal(report.spaces.length, 1, 'unchanged spaces stay out of the breakdown');
  assert.deepEqual(report.spaces[0], {
    spaceId: 'touched', space: 'Touched', canonicalized: 2, far: 1,
    maxShift: Math.abs(node - noise),
    maxShiftCm: Math.abs(node - noise) * 240 * 10,
  });
  assert.equal(report.maxShift, Math.abs(node - noise));
  assert.equal(report.maxShiftCm, Math.abs(node - noise) * 240 * 10);
});

test('lattice movement format keeps three significant digits without fake 0.1 cm (#291)', () => {
  assert.equal(formatLatticeShiftCm(0), '0');
  assert.equal(formatLatticeShiftCm(0.000033), '3.30e-5');
  assert.equal(formatLatticeShiftCm(0.0012345), '0.00123');
  assert.equal(formatLatticeShiftCm(1.2), '1.2');
});

test('Optimize can apply the same barrier in-place without a second clone (#291)', () => {
  const input = structuredClone(fixture.configInput);
  assert.equal(canonicalizeConfigGeometryInPlace(input), input);
  assert.deepEqual(input, fixture.configExpected);
});

test('#383 furniture flip flags survive frontend canonicalization unchanged', () => {
  const config = { spaces: [{
    id: 's', decor: [{
      id: 'f', kind: 'furniture', symbol: 'sofa', x: 0.2000000001, y: 0.3,
      w: 0.18, h: 0.075, flip_h: true, flip_v: false,
    }],
  }] };
  const furniture = canonicalizeConfigGeometry(config).spaces[0].decor[0];
  assert.equal(furniture.flip_h, true);
  assert.equal(furniture.flip_v, false);
});

test('#663 stair transforms keep continuous wall-face magnet positions', () => {
  const stair = {
    id: 'stair', kind: 'straight', direction: 'forward', target_space_id: 'upper',
    x: 0.5000001, y: 0.3999999, length: 0.2000001, width: 0.0999999,
    angle: 17.1234567896,
  };
  const output = canonicalizeConfigGeometry({ spaces: [{ id: 'ground', stairs: [stair] }] })
    .spaces[0].stairs[0];
  assert.deepEqual(output, {
    ...stair,
    x: 0.5000001, y: 0.3999999, length: 0.2000001, width: 0.0999999,
    angle: 17.12345679,
  });
});

test('one position changes only x/y and preserves future metadata (#224)', () => {
  const input = {
    s: 'floor', x: 0.1000000006, y: -0.0000000004,
    k: 1.0000000004, nested: { numeric: 0.1234567896 },
  };
  assert.deepEqual(canonicalizePosition(input), {
    s: 'floor', x: 0.1, y: 0,
    k: 1.0000000004, nested: { numeric: 0.1234567896 },
  });
});

test('frontend write paths adopt canonical candidates before persistence (#224)', () => {
  const source = readHouseplanProductionSource();
  const eagerCardSource = readFileSync(
    new URL('../src/houseplan-card.ts', import.meta.url),
    'utf8',
  );
  assert.match(source, /enqueueSerializedWrite\(this\._writeChain, async \(\) =>/);
  assert.match(
    source,
    /const candidate = this\._prepareConfigCandidate\(this\._serverCfg\);/,
  );
  assert.match(
    eagerCardSource,
    /const candidate = canonicalizeConfigGeometry\(this\._serverCfg\);/,
    'the eager View writer keeps the same canonicalization barrier as the lazy editor writer',
  );
  assert.match(
    source,
    /const canonicalCandidate = canonicalizeConfigGeometry\(candidate\);[\s\S]*config: canonicalCandidate/,
  );
  // #500: the reactive root is replaced only when canonicalization changed
  // content — the rule moved into the identity owner with the writers.
  assert.match(source, /this\._adoption\.stageConfigCandidate\(candidate\);\s*(?:try \{\s*)?await this\._sendConfigCandidate\(candidate\);/);
  assert.match(
    readFileSync(new URL('../src/config-adoption.ts', import.meta.url), 'utf8'),
    /stageConfigCandidate\(candidate: ServerConfig\): void \{\s*const fingerprint = contentFingerprint\(candidate\);\s*if \(fingerprint !== contentFingerprint\(this\.config\)\) this\.setConfig\(candidate\);/,
  );
  assert.match(
    source,
    /const pos = canonicalizePosition\(this\._layout\[id\]\);[\s\S]*device_id: id, pos/,
  );
  assert.match(
    source,
    /this\._layout = canonicalizeLayoutGeometry\(this\._layout\);[\s\S]*localStorage\.setItem/,
  );
});