const assert = require('assert');
const fs = require('fs');
const path = require('path');

const root = path.resolve(__dirname, '..');
const canvasHtml = fs.readFileSync(path.join(root, 'frontend', 'canvas.html'), 'utf8');

assert(
  canvasHtml.includes('Build GDS'),
  'Project Tree header should include a Build GDS button'
);
assert(
  canvasHtml.includes('/api/build-gds'),
  'Build GDS button should call the backend build-gds API'
);
assert(
  canvasHtml.includes(':layout'),
  'Build Layout should open an SVG preview tab named like canvas_1:layout'
);
assert(
  canvasHtml.includes('svg_url'),
  'Build Layout should use the backend svg_url response'
);
assert(
  canvasHtml.includes('layoutPreview'),
  'canvas pages should support a layoutPreview tab type'
);
assert(
  canvasHtml.includes('LayoutSvgPreview'),
  'layout preview tabs should use the auto-scaling SVG viewer'
);
assert(
  canvasHtml.includes('layoutScale'),
  'layout SVG preview should expose an editable scale value'
);
assert(
  canvasHtml.includes('objectFit: \'contain\''),
  '100% layout preview scale should fit the full SVG within the screen'
);
assert(
  canvasHtml.includes('className="build-gds-btn"'),
  'Build GDS should use a dedicated polished button class'
);
assert(
  canvasHtml.includes('buildGdsBusy'),
  'Build GDS should expose an in-progress state to prevent duplicate requests'
);
assert(
  canvasHtml.includes('Build GDS network error'),
  'Build GDS fetch failures should produce a specific network diagnostic'
);
assert(
  canvasHtml.includes('className="build-layout-btn"'),
  'Build Layout should use the polished primary action class'
);
assert(
  canvasHtml.includes('Route Editor'),
  'Selecting an edge should expose a route editor'
);
assert(
  canvasHtml.includes('selectedEdge'),
  'canvas should track selected edges separately from selected nodes'
);
assert(
  canvasHtml.includes('technologyManifest'),
  'canvas should load the selected technology manifest'
);
assert(
  canvasHtml.includes('standard_bend'),
  'route editor should offer standard_bend as a routing type'
);
assert(
  canvasHtml.includes('findSameFamilyRouteCrossing'),
  'canvas should validate same-family route crossings'
);