'use strict';

const assert = require('assert/strict');
const { resolveDirectEditConstraints } = require('../src/compile/direct-edit-solver');

const model = { roads: [], endpoints: [], connections: [], diagnostics: [] };

function constraint(overrides = {}) {
  return {
    id: 'constraint-1',
    kind: 'road-edge-offset',
    anchor: { type: 'road-interval', roadId: 'road:way/1:forward', startStation: 0.3, endStation: 0.7 },
    anchorSnapshot: {
      coordinate: [113.1, 30.2],
      tangentAzimuth: 45,
      roadLengthMeters: 120,
      osmNodeIds: ['1', '2'],
    },
    value: { offsetMeters: 1.5, transition: 'smoothstep' },
    enabled: true,
    status: 'exact',
    provenance: { operationId: 'operation-1', createdAt: '2026-08-27T00:00:00.000Z' },
    ...overrides,
  };
}

function document(constraints) {
  return { schema: 'native-road-edits/v2', documentVersion: 1, base: {}, constraints, operations: [] };
}

// A missing or empty document must resolve to the identity: this is what keeps
// the stage insertable ahead of compileGeometry without moving any geometry.
for (const empty of [null, undefined, document([])]) {
  const resolution = resolveDirectEditConstraints(model, empty);
  assert.equal(resolution.schema, 'road-edit-resolution/v1');
  assert.equal(resolution.roadProfiles.size, 0);
  assert.equal(resolution.junctionPlans.size, 0);
  assert.deepEqual(resolution.constraintStates, []);
  assert.deepEqual(resolution.diagnostics, []);
  assert.equal(resolution.handles.schema, 'road-edit-handles/v1');
  assert.deepEqual(resolution.handles.handles, []);
  assert.deepEqual(resolution.handles.reserves, []);
  assert.equal(resolution.handles.revisionId, null);
  assert.equal(resolution.handles.previewSeq, 0);
}

// Handle manifest context is echoed so a preview response can be matched to the
// request that asked for it.
const withContext = resolveDirectEditConstraints(model, null, { revisionId: 'rev-0007', previewSeq: 42 });
assert.equal(withContext.handles.revisionId, 'rev-0007');
assert.equal(withContext.handles.previewSeq, 42);

// A small ordinary junction exercises the step-two manifest contract without
// depending on the full OSM parser. Three approaches produce one reserve each,
// all six kinds, and native feature links for the downstream map highlighter.
const junctionRoads = ['a', 'b', 'c'].map((id, index) => ({
  id: `road:${id}`,
  segmentId: `segment:${id}`,
  direction: 'forward',
  centerline: [
    [113 + index * 0.001, 30],
    [113 + index * 0.001 + (index === 1 ? 0.001 : 0), 30 + (index === 1 ? 0.001 : 0.001)],
  ],
  sourceNodeIds: ['junction', `end-${id}`],
  osmWayIds: [id],
  widthMeters: 6,
  laneCount: 2,
  sidewalkLeft: true,
  sidewalkRight: true,
}));
const junctionModel = {
  roads: junctionRoads,
  endpoints: junctionRoads.map((road) => ({
    id: `endpoint:${road.id}:start`,
    roadId: road.id,
    side: 'start',
    nodeId: 'junction',
    coordinate: road.centerline[0],
  })),
  connections: [],
};
const junctionResolution = resolveDirectEditConstraints(junctionModel, document([]), { revisionId: 'rev-junction' });
assert.equal(junctionResolution.handles.reserves.length, 3);
assert.equal(new Set(junctionResolution.handles.handles.map((handle) => handle.kind)).size, 6);
assert.ok(junctionResolution.handles.handles.every((handle) => handle.position.every(Number.isFinite)));
assert.ok(junctionResolution.handles.handles.every((handle) => Number.isFinite(handle.axisAzimuth)));
assert.ok(junctionResolution.handles.handles.some((handle) => handle.affects.includes('junction:node/junction')));

const anchored = constraint({
  id: 'edge-on-road-a',
  anchor: { type: 'road-interval', roadId: 'road:a', startStation: 0.2, endStation: 0.8, side: 'left' },
});
const anchoredResolution = resolveDirectEditConstraints(junctionModel, document([anchored]));
const anchoredHandle = anchoredResolution.handles.handles.find(
  (handle) => handle.kind === 'road-edge-offset' && handle.anchor.roadId === 'road:a' && handle.anchor.side === 'left',
);
assert.equal(anchoredHandle.constraintId, 'edge-on-road-a');

const allKinds = [
  anchored,
  constraint({
    id: 'sidewalk-on-road-a',
    kind: 'road-sidewalk-width',
    anchor: { type: 'road-interval', roadId: 'road:a', startStation: 0.2, endStation: 0.8, side: 'left' },
    value: { widthMeters: 3, transition: 'linear' },
  }),
  constraint({
    id: 'divider-on-road-a',
    kind: 'road-lane-divider',
    anchor: { type: 'road-interval', roadId: 'road:a', startStation: 0.2, endStation: 0.8 },
    value: { boundaryIndex: 1, offsetMeters: 0.1, transition: 'smoothstep' },
  }),
  constraint({
    id: 'approach-width',
    kind: 'junction-approach-width',
    anchor: { type: 'junction-approach', nodeId: 'junction', segmentId: 'segment:a' },
    value: { widthMeters: 7 },
  }),
  constraint({
    id: 'approach-cutback',
    kind: 'junction-cutback',
    anchor: { type: 'junction-approach', nodeId: 'junction', segmentId: 'segment:a' },
    value: { cutbackMeters: 2 },
  }),
  constraint({
    id: 'corner-radius',
    kind: 'junction-corner-radius',
    anchor: { type: 'junction-corner', nodeId: 'junction', incomingRoadId: 'segment:a', outgoingRoadId: 'segment:b' },
    value: { radiusMeters: 4 },
  }),
];
const allKindsResolution = resolveDirectEditConstraints(junctionModel, document(allKinds));
assert.deepEqual(
  allKindsResolution.constraintStates.map((state) => state.applied),
  [true, true, true, true, true, true],
);
assert.equal(allKindsResolution.roadProfiles.get('road:a').sidewalkWidths.left, 3);
assert.equal(allKindsResolution.roadProfiles.get('road:a').laneDividerOffsets[1], 0.1);
assert.equal(
  allKindsResolution.handles.handles.find((handle) => handle.kind === 'road-lane-divider').constraintId,
  'divider-on-road-a',
);
assert.equal(allKindsResolution.junctionPlans.get('junction').approaches['segment:a'].widthMeters, 7);
assert.equal(allKindsResolution.junctionPlans.get('junction').approaches['segment:a'].cutbackMeters, 2);
assert.equal(allKindsResolution.junctionPlans.get('junction').corners['segment:a->segment:b'], 4);

const recheckResolution = resolveDirectEditConstraints(
  junctionModel,
  { ...document([anchored]), base: { compilerGeometryVersion: 'old-geometry' } },
  { compilerGeometryVersion: 'new-geometry' },
);
assert.equal(recheckResolution.constraintStates[0].status, 'recheck');
assert.equal(recheckResolution.constraintStates[0].applied, true);

const pendingResolution = resolveDirectEditConstraints(
  junctionModel,
  document([
    constraint({
      anchor: { type: 'road-interval', roadId: 'missing-road', startStation: 0.2, endStation: 0.8, side: 'left' },
      anchorSnapshot: { ...constraint().anchorSnapshot, coordinate: [113, 30], osmNodeIds: ['junction'] },
    }),
  ]),
);
assert.equal(pendingResolution.constraintStates[0].status, 'pending');
assert.equal(pendingResolution.constraintStates[0].applied, false);

const invalidDivider = resolveDirectEditConstraints(
  junctionModel,
  document([
    constraint({
      kind: 'road-lane-divider',
      anchor: { type: 'road-interval', roadId: 'road:a', startStation: 0.2, endStation: 0.8 },
      value: { boundaryIndex: 3, offsetMeters: 0 },
    }),
  ]),
);
assert.equal(invalidDivider.constraintStates[0].applied, false);
assert.equal(invalidDivider.constraintStates[0].status, 'stale');
assert.equal(invalidDivider.constraintStates[0].reason, 'status-stale');
assert.equal(invalidDivider.roadProfiles.size, 0);

// A disabled constraint is reported, never applied, and produces no diagnostic:
// the user turned it off deliberately, so it is not a problem to report.
const disabled = resolveDirectEditConstraints(model, document([constraint({ enabled: false })]));
assert.deepEqual(disabled.constraintStates, [
  { constraintId: 'constraint-1', kind: 'road-edge-offset', status: 'exact', applied: false, reason: 'disabled' },
]);
assert.deepEqual(disabled.diagnostics, []);

// Only `exact` and `recheck` may reach the solver. The other three statuses mean
// the anchor is not trustworthy, so they are skipped with the status as reason.
for (const status of ['pending', 'conflicted', 'stale']) {
  const resolution = resolveDirectEditConstraints(model, document([constraint({ status })]));
  assert.deepEqual(resolution.constraintStates, [
    { constraintId: 'constraint-1', kind: 'road-edge-offset', status, applied: false, reason: `status-${status}` },
  ]);
  assert.deepEqual(resolution.diagnostics, []);
}

// An exact constraint whose anchor disappeared during reimport is stale and
// must not enter the solver.
for (const status of ['exact', 'recheck']) {
  const resolution = resolveDirectEditConstraints(model, document([constraint({ status })]));
  assert.deepEqual(resolution.constraintStates, [
    {
      constraintId: 'constraint-1',
      kind: 'road-edge-offset',
      status: 'stale',
      applied: false,
      reason: 'status-stale',
    },
  ]);
  assert.deepEqual(resolution.diagnostics, []);
}

// Every constraint gets exactly one state, in document order, so a caller can
// report per-row status without re-deriving the mapping.
const many = resolveDirectEditConstraints(
  model,
  document([
    constraint({ id: 'a', enabled: false }),
    constraint({ id: 'b', status: 'stale' }),
    constraint({ id: 'c' }),
  ]),
);
assert.deepEqual(
  many.constraintStates.map((state) => state.constraintId),
  ['a', 'b', 'c'],
);

// The solver must be free of file and network access so preview can share it.
const source = require('fs').readFileSync(require.resolve('../src/compile/direct-edit-solver'), 'utf8');
for (const forbidden of ["require('fs')", "require('path')", "require('http')", "require('https')"])
  assert.equal(source.includes(forbidden), false, `direct-edit-solver must not ${forbidden}`);

console.log('direct edit solver tests passed');