'use strict';

const assert = require('assert/strict');
const { resolveDirectEditConstraints, SOLVED_KINDS } = 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 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, []);
}

// Until a kind is wired into the solver its constraints are reported as
// unapplied with an explicit diagnostic, rather than approximated or ignored.
for (const status of ['exact', 'recheck']) {
  const resolution = resolveDirectEditConstraints(model, document([constraint({ status })]));
  const expected = SOLVED_KINDS.has('road-edge-offset')
    ? { applied: true, reason: null, diagnostics: 0 }
    : { applied: false, reason: 'kind-not-solved', diagnostics: 1 };
  assert.deepEqual(resolution.constraintStates, [
    {
      constraintId: 'constraint-1',
      kind: 'road-edge-offset',
      status,
      applied: expected.applied,
      reason: expected.reason,
    },
  ]);
  assert.equal(resolution.diagnostics.length, expected.diagnostics);
  for (const item of resolution.diagnostics) {
    assert.equal(item.severity, 'info');
    assert.equal(item.rule, 'direct-edit-kind-not-solved');
    assert.equal(item.subjectId, 'constraint:constraint-1');
    assert.equal(item.geometry, null);
  }
}

// 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');