'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')));

// The left handle must sit on the geometry compiler's left. `offsetLine()` shifts a
// positive offset counter-clockwise from the direction of travel and sidewalks use
// `heading + (side === 'left' ? -90 : 90)`, so for the north-heading road:a that is
// west. Drawing it east put it over the right kerb, and dragging the visually-left
// handle then moved the right edge.
const northEdges = junctionResolution.handles.handles.filter(
  (handle) => handle.kind === 'road-edge-offset' && handle.anchor.roadId === 'road:a',
);
const leftEdge = northEdges.find((handle) => handle.anchor.side === 'left');
const rightEdge = northEdges.find((handle) => handle.anchor.side === 'right');
assert.ok(leftEdge && rightEdge, 'both edge handles must be published');
assert.ok(leftEdge.position[0] < 113, 'left edge handle must sit west of a north-heading centerline');
assert.ok(rightEdge.position[0] > 113, 'right edge handle must sit east of a north-heading centerline');
const northSidewalks = junctionResolution.handles.handles.filter(
  (handle) => handle.kind === 'road-sidewalk-width' && handle.anchor.roadId === 'road:a',
);
assert.ok(
  northSidewalks.find((handle) => handle.anchor.side === 'left').position[0] < 113,
  'the sidewalk handle must follow the same side convention as the edge handle',
);

// A selection scopes the manifest to the object being edited. The whole-area
// manifest is 844 KB on a 41-road workspace, 89% of it `affects` id lists, while
// the map renders about six handles — so every new handle kind multiplies a
// payload the client throws away.
const unscoped = junctionResolution.handles.handles;
const segmentScoped = resolveDirectEditConstraints(junctionModel, document([]), {
  selection: { type: 'segment', id: 'segment:a' },
}).handles.handles;
assert.ok(segmentScoped.length > 0, 'a segment selection must still publish its road handles');
assert.ok(segmentScoped.length < unscoped.length, 'a segment selection must be smaller than the whole manifest');
assert.ok(
  segmentScoped.every((handle) => handle.kind.startsWith('road-')),
  'junction kinds belong to JunctionTools and must not reach a segment selection',
);
assert.ok(
  segmentScoped.every((handle) => handle.anchor.roadId === 'road:a'),
  'a segment selection must only carry that segment’s handles',
);
// Scoping must not invent or drop handles: it is a filter of the full manifest.
assert.deepEqual(
  segmentScoped.map((handle) => handle.handleId).sort(),
  unscoped
    .filter((handle) => handle.kind.startsWith('road-') && handle.anchor.roadId === 'road:a')
    .map((handle) => handle.handleId)
    .sort(),
);

const junctionScoped = resolveDirectEditConstraints(junctionModel, document([]), {
  selection: { type: 'junction', id: 'junction' },
}).handles.handles;
assert.ok(junctionScoped.length > 0, 'a junction selection must publish that node’s handles');
assert.ok(
  junctionScoped.every((handle) => handle.kind.startsWith('junction-') && handle.anchor.nodeId === 'junction'),
  'a junction selection must only carry that node’s handles',
);

// Omitting the selection keeps the full manifest, which the compiler and the
// existing callers rely on.
assert.equal(resolveDirectEditConstraints(junctionModel, document([]), {}).handles.handles.length, unscoped.length);

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'],
);

// A short road sandwiched between two junctions. `junctionReserves()` caps each
// end's reserve at 0.45, so `start >= end` can never fire; what decides whether
// an edit is offered is the surviving band measured in meters against the road's
// own width. 0.00013 degrees of latitude is about 14.4 m, shorter than the
// cutback the approaches demand at either end, so both ends hit the cap and the
// band lands at ~1.4 m.
function sandwichModel(shortWidthMeters, shortLaneCount) {
  const nodeA = [113, 30];
  const nodeB = [113, 30.00013];
  const road = (id, from, to, widthMeters, laneCount) => ({
    id: `road:${id}`,
    segmentId: `segment:${id}`,
    direction: 'forward',
    centerline: [from, to],
    sourceNodeIds: [`node-${id}-a`, `node-${id}-b`],
    osmWayIds: [id],
    widthMeters,
    laneCount,
    sidewalkLeft: true,
    sidewalkRight: true,
  });
  const endpoint = (roadId, side, nodeId, coordinate) => ({
    id: `endpoint:${roadId}:${side}`,
    roadId,
    side,
    nodeId,
    coordinate,
  });
  return {
    roads: [
      road('short', nodeA, nodeB, shortWidthMeters, shortLaneCount),
      road('a1', nodeA, [112.999, 30], 6, 2),
      road('a2', nodeA, [113.001, 30], 6, 2),
      road('b1', nodeB, [112.999, 30.00013], 6, 2),
      road('b2', nodeB, [113.001, 30.00013], 6, 2),
    ],
    endpoints: [
      endpoint('road:short', 'start', 'node-a', nodeA),
      endpoint('road:a1', 'start', 'node-a', nodeA),
      endpoint('road:a2', 'start', 'node-a', nodeA),
      endpoint('road:short', 'end', 'node-b', nodeB),
      endpoint('road:b1', 'start', 'node-b', nodeB),
      endpoint('road:b2', 'start', 'node-b', nodeB),
    ],
    connections: [],
  };
}

function roadHandlesFor(resolution, roadId) {
  return resolution.handles.handles.filter(
    (handle) => handle.kind.startsWith('road-') && handle.anchor.roadId === roadId,
  );
}

// The short road's band is ~1.4 m against a 10 m width, so every road handle on
// it is read-only and says why. The long approach at the same junction keeps its
// handles, which is what proves the rule is about the band and not about being
// adjacent to a junction.
const sandwich = resolveDirectEditConstraints(sandwichModel(10, 4), document([]), { revisionId: 'rev-sandwich' });
const shortHandles = roadHandlesFor(sandwich, 'road:short');
const longHandles = roadHandlesFor(sandwich, 'road:a1');
assert.ok(shortHandles.length > 0, 'the blocked road must still publish handles so the map can explain them');
assert.ok(longHandles.length > 0);
assert.ok(shortHandles.every((handle) => handle.editable === false));
assert.ok(shortHandles.every((handle) => handle.disabledReason.includes('JunctionTools')));
assert.ok(longHandles.every((handle) => handle.editable === true));
assert.ok(longHandles.every((handle) => handle.disabledReason === undefined));

// Junction kinds are JunctionTools' territory and must stay draggable there.
assert.ok(
  sandwich.handles.handles
    .filter((handle) => handle.kind.startsWith('junction-'))
    .every((handle) => handle.editable === true),
);

// The band is compared in meters against the road's own width. The 0.45 cap keeps
// the band at ~1.4 m either way, so changing only the width crosses the boundary.
assert.ok(
  roadHandlesFor(resolveDirectEditConstraints(sandwichModel(2, 2), document([])), 'road:short').every(
    (h) => !h.editable,
  ),
);
assert.ok(
  roadHandlesFor(resolveDirectEditConstraints(sandwichModel(1, 2), document([])), 'road:short').every(
    (h) => h.editable,
  ),
);

// Greying is a UI affordance, not a retroactive veto: an edit already saved
// against this road keeps being solved, or a compiler upgrade would silently drop
// it and the geometry would move underneath the user.
const onBlocked = resolveDirectEditConstraints(
  sandwichModel(10, 4),
  document([
    constraint({
      id: 'edge-on-short',
      anchor: { type: 'road-interval', roadId: 'road:short', startStation: 0.45, endStation: 0.55, side: 'left' },
    }),
  ]),
);
assert.equal(onBlocked.constraintStates[0].applied, true);
assert.equal(onBlocked.roadProfiles.get('road:short').edgeOffsets.left, 1.5);

// 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');