/*
 * Description: Static regression tests for resilient project save/reopen behavior.
 * Inside functions: N/A - assertion-based test/module script.
 * Developer : Qin Yue @ 2026
 * Organization : OptiHK Limited
 */
const assert = require('assert');
const fs = require('fs');
const path = require('path');

const root = path.resolve(__dirname, '..');
const backend = path.join(root, 'backend');
const layoutFilesPath = path.join(backend, 'layout_files.py');
const layoutFilesPy = fs.readFileSync(layoutFilesPath, 'utf8');
const serverPy = fs.readFileSync(path.join(backend, 'server.py'), 'utf8');
const gdsBuilderPy = fs.readFileSync(path.join(backend, 'gds_builder.py'), 'utf8');
const routedPreviewPy = fs.readFileSync(path.join(backend, 'routed_layout_preview.py'), 'utf8');
const canvasHtml = fs.readFileSync(path.join(root, 'frontend', 'canvas.html'), 'utf8');

assert(
  fs.existsSync(layoutFilesPath),
  'backend/layout_files.py should centralize saved layout YAML filtering and parsing'
);
assert(
  layoutFilesPy.includes('ROUTE_SIDECAR_SUFFIXES') &&
    layoutFilesPy.includes('def is_layout_cell_filename') &&
    layoutFilesPy.includes('def parse_layout_cell_content') &&
    layoutFilesPy.includes('def load_layout_cell_files'),
  'layout file helpers should exclude route sidecars and validate saved layout cells'
);
assert(
  serverPy.includes('is_layout_cell_filename') &&
    serverPy.includes('load_layout_cell_files(root)') &&
    serverPy.includes('parse_layout_cell_content(content') &&
    serverPy.includes('except LayoutFileError as e'),
  'project list/load/save endpoints should filter invalid YAML and reject malformed saves'
);
assert(
  gdsBuilderPy.includes('TemporaryDirectory(prefix="mxpic_gds_project_"') &&
    gdsBuilderPy.includes('write_layout_cells_to_directory(cells, staged_project_dir)'),
  'Build GDS should call mxpic_router with a clean staged project directory'
);
assert(
  routedPreviewPy.includes('staged_project_dir') &&
    routedPreviewPy.includes('write_layout_cells_to_directory(staged_cells, staged_project_dir)') &&
    routedPreviewPy.includes('project_dir=staged_project_dir'),
  'Build Layout preview should stage valid cells before calling mxpic_router'
);
assert(
  canvasHtml.includes('(data.warnings || []).forEach(warning => addLog(warning))') &&
    canvasHtml.includes('const parsedCellPages = [];') &&
    canvasHtml.includes('Skipped saved cell'),
  'canvas project loading should report skipped files and keep loading remaining valid cells'
);