'use strict';

const assert = require('assert/strict');
const fs = require('fs');
const os = require('os');
const path = require('path');
const { compileInput } = require('../src/compile/compiler');
const { ensureRevisionStore } = require('../src/compile/road-revisions');
const { editPreview, editState, rebaseEdits, saveEdits } = require('../workbench/server');

const workspace = fs.mkdtempSync(path.join(os.tmpdir(), 'workbench-edit-api-'));
const input = {
  areaId: 'edit-api-test',
  osmFile: path.join(workspace, 'source.osm'),
  outDir: path.join(workspace, 'outputs', 'native-road'),
  stagingDir: path.join(workspace, 'outputs', '_pipeline'),
  overridesFile: path.join(workspace, 'native-road-overrides.json'),
  trafficSignalsFile: path.join(workspace, 'native-traffic-signals.json'),
  options: { edgeLines: false, junctionTemplates: { enabled: false, references: [] } },
};
fs.copyFileSync(path.join(__dirname, 'fixtures', 'fengshu-er-road.osm'), input.osmFile);
fs.writeFileSync(input.overridesFile, `${JSON.stringify({ schema: 'native-road-overrides/v1', overrides: [] })}\n`);
fs.writeFileSync(
  input.trafficSignalsFile,
  `${JSON.stringify({ schema: 'native-traffic-signals/v1', provenance: 'empty', assemblies: { type: 'FeatureCollection', features: [] } })}\n`,
);
const initialized = ensureRevisionStore(workspace, input.options);
const area = compileInput({
  ...input,
  areaConfigSnapshotFile: initialized.paths.activeAreaConfig,
  editsFile: initialized.paths.activeEdits,
}).area;

const state = editState(area);
assert.equal(state.active, true);
assert.equal(state.documentVersion, 0);
assert.equal(state.handles.schema, 'road-edit-handles/v1');
assert.equal(state.activeRevisionId, 'rev-0001');

const trackedFiles = [
  initialized.paths.activeEdits,
  initialized.paths.activeState,
  initialized.paths.activeAreaConfig,
].map((file) => ({
  file,
  bytes: fs.readFileSync(file),
  mtimeMs: fs.statSync(file).mtimeMs,
}));
const preview = editPreview(area, { previewSeq: 17, document: state.document });
assert.equal(preview.ok, true);
assert.equal(preview.previewSeq, 17);
assert.equal(preview.degraded, false);
assert.equal(preview.handles.schema, 'road-edit-handles/v1');
assert.ok(preview.layers.roadSurface);
for (const tracked of trackedFiles) {
  assert.deepEqual(fs.readFileSync(tracked.file), tracked.bytes, `${tracked.file} bytes unchanged by preview`);
  assert.equal(fs.statSync(tracked.file).mtimeMs, tracked.mtimeMs, `${tracked.file} mtime unchanged by preview`);
}

const saved = saveEdits(area, { expectedDocumentVersion: 0, document: state.document });
assert.equal(saved.documentVersion, 1);
const beforeConflict = fs.readFileSync(initialized.paths.activeEdits);
assert.throws(
  () => saveEdits(area, { expectedDocumentVersion: 0, document: state.document }),
  (error) => error.statusCode === 409 && error.current.documentVersion === 1,
);
assert.deepEqual(fs.readFileSync(initialized.paths.activeEdits), beforeConflict, '409 does not write the document');

const checkpoint = require('../src/compile/road-revisions').createCheckpoint(workspace, 'Preview checkpoint');
assert.equal(checkpoint.manifest.id, 'rev-0002');
const rebased = rebaseEdits(area, checkpoint.manifest.id);
assert.equal(rebased.counts.exact, 0);
assert.deepEqual(rebased.constraints, []);

// The map saves `constraints` + `operations`, not a whole document. That merge path
// is what the client actually exercises, and leaving the operations out is exactly
// how the first wiring produced a 400.
const edgeHandle = state.handles.handles.find((handle) => handle.kind === 'road-edge-offset');
assert.ok(edgeHandle, 'the fixture must publish a road edge handle');
const clientConstraint = {
  id: `constraint:${edgeHandle.handleId}`,
  kind: 'road-edge-offset',
  anchor: edgeHandle.anchor,
  anchorSnapshot: {
    coordinate: edgeHandle.position,
    tangentAzimuth: 0,
    roadLengthMeters: 120,
    osmNodeIds: ['1'],
  },
  value: { offsetMeters: 0.5, transition: 'smoothstep' },
  enabled: true,
  status: 'exact',
  provenance: { operationId: 'operation:client:1', createdAt: '2026-08-27T00:00:00.000Z' },
};
const clientOperation = {
  id: clientConstraint.provenance.operationId,
  createdAt: clientConstraint.provenance.createdAt,
  constraintIds: [clientConstraint.id],
};
assert.throws(
  () => saveEdits(area, { expectedDocumentVersion: 1, constraints: [clientConstraint], operations: [] }),
  /provenance\.operationId/,
  'a constraint saved without its operation must be rejected, not written',
);
const clientSaved = saveEdits(area, {
  expectedDocumentVersion: 1,
  constraints: [clientConstraint],
  operations: [clientOperation],
});
assert.equal(clientSaved.documentVersion, 2);

// A save that does not survive a reload as `exact` was cosmetic.
const reloaded = editState(area);
assert.equal(reloaded.documentVersion, 2);
assert.deepEqual(
  reloaded.document.constraints.map((item) => item.id),
  [clientConstraint.id],
);
assert.equal(reloaded.constraintStates[0].status, 'exact');
assert.equal(reloaded.constraintStates[0].applied, true);

fs.rmSync(workspace, { recursive: true, force: true });
console.log('workbench edit API tests passed');