const fs = require('fs');
const path = require('path');
const { createRequire } = require('module');

const repoRoot = path.resolve(__dirname, '..', '..', '..', '..', '..');
const webRoot = path.join(repoRoot, 'src', 'Web', 'StellaOps.Web');
const appRoot = path.join(webRoot, 'src', 'app');
const outRoot = path.join(repoRoot, 'docs', 'modules', 'ui', 'component-preservation-map');
const requireFromWeb = createRequire(path.join(webRoot, 'package.json'));
const ts = requireFromWeb('typescript');

const MENU_FILES = [
  path.join(appRoot, 'layout', 'app-sidebar', 'app-sidebar.component.ts'),
  path.join(appRoot, 'core', 'navigation', 'navigation.config.ts'),
  path.join(appRoot, 'layout', 'app-topbar', 'app-topbar.component.ts'),
  path.join(appRoot, 'shared', 'components', 'user-menu', 'user-menu.component.ts'),
].map(path.normalize);

const GENERATION_DATE = new Date().toISOString().slice(0, 10);

function walk(dir) {
  const results = [];
  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
    if (entry.name === 'node_modules' || entry.name === 'dist' || entry.name === '.angular') {
      continue;
    }

    const fullPath = path.join(dir, entry.name);
    if (entry.isDirectory()) {
      results.push(...walk(fullPath));
      continue;
    }

    results.push(fullPath);
  }
  return results;
}

function read(filePath) {
  return fs.readFileSync(filePath, 'utf8');
}

function ensureDir(dirPath) {
  fs.mkdirSync(dirPath, { recursive: true });
}

function write(filePath, content) {
  ensureDir(path.dirname(filePath));
  fs.writeFileSync(filePath, content.replace(/\n/g, '\r\n'));
}

function repoRel(filePath) {
  return path.relative(repoRoot, filePath).replace(/\\/g, '/');
}

function appRel(filePath) {
  return path.relative(appRoot, filePath).replace(/\\/g, '/');
}

function normalizeRoute(routePath) {
  if (!routePath || routePath === '/') {
    return '/';
  }

  let value = routePath.replace(/\\/g, '/').trim();
  if (!value.startsWith('/')) {
    value = `/${value}`;
  }

  value = value.replace(/\/+/g, '/');
  if (value.length > 1) {
    value = value.replace(/\/$/, '');
  }
  return value;
}

function joinRoute(prefix, segment) {
  const cleanPrefix = normalizeRoute(prefix || '/');
  if (!segment || segment === '') {
    return cleanPrefix;
  }
  if (segment.startsWith('/')) {
    return normalizeRoute(segment);
  }
  if (cleanPrefix === '/') {
    return normalizeRoute(segment);
  }
  return normalizeRoute(`${cleanPrefix}/${segment}`);
}

function sortUnique(values) {
  return Array.from(new Set(values)).sort((left, right) => left.localeCompare(right));
}

function titleCase(value) {
  return value
    .replace(/([a-z0-9])([A-Z])/g, '$1 $2')
    .replace(/[-_]/g, ' ')
    .replace(/\s+/g, ' ')
    .trim()
    .replace(/\b\w/g, (match) => match.toUpperCase());
}

function humanizeComponentName(className) {
  return titleCase(className.replace(/Component$/, ''));
}

function slugify(value) {
  return value
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-+|-+$/g, '');
}

function canHaveDecorators(node) {
  return typeof ts.canHaveDecorators === 'function' && ts.canHaveDecorators(node);
}

function getDecorators(node) {
  if (!canHaveDecorators(node) || typeof ts.getDecorators !== 'function') {
    return [];
  }
  return ts.getDecorators(node) ?? [];
}

function stringLiteralValue(node) {
  if (!node) {
    return null;
  }
  if (ts.isStringLiteral(node) || ts.isNoSubstitutionTemplateLiteral(node)) {
    return node.text;
  }
  return null;
}

function propertyNameText(nameNode) {
  if (!nameNode) {
    return null;
  }
  if (ts.isIdentifier(nameNode) || ts.isStringLiteral(nameNode) || ts.isNoSubstitutionTemplateLiteral(nameNode)) {
    return nameNode.text;
  }
  return null;
}

function getObjectProperty(objectLiteral, name) {
  for (const property of objectLiteral.properties) {
    if (!ts.isPropertyAssignment(property)) {
      continue;
    }
    if (propertyNameText(property.name) === name) {
      return property.initializer;
    }
  }
  return null;
}

function getStringProperty(objectLiteral, name) {
  return stringLiteralValue(getObjectProperty(objectLiteral, name));
}

function getIdentifierProperty(objectLiteral, name) {
  const initializer = getObjectProperty(objectLiteral, name);
  return initializer && ts.isIdentifier(initializer) ? initializer.text : null;
}

function getArrayProperty(objectLiteral, name) {
  const initializer = getObjectProperty(objectLiteral, name);
  return initializer && ts.isArrayLiteralExpression(initializer) ? initializer : null;
}

function isRouteFile(filePath) {
  const normalized = filePath.replace(/\\/g, '/');
  return normalized.endsWith('.routes.ts') || normalized.endsWith('/app.routes.ts');
}

function isSpecOrStory(filePath) {
  const normalized = filePath.replace(/\\/g, '/');
  return normalized.includes('.spec.') || normalized.includes('.stories.');
}

function extractAbsoluteRoutes(text) {
  const routes = [];
  const pattern = /['"`](\/[A-Za-z0-9_:@?&=./-]*)['"`]/g;
  let match = pattern.exec(text);
  while (match) {
    routes.push(normalizeRoute(match[1]));
    match = pattern.exec(text);
  }
  return sortUnique(routes);
}

function deriveFamily(relativePath) {
  const parts = relativePath.split('/');
  if (parts[0] === 'features') {
    return parts[1] ?? 'features';
  }
  if (parts[0] === 'shared') {
    return parts[1] ?? 'shared';
  }
  if (parts[0] === 'layout') {
    return parts[1] ?? 'layout';
  }
  if (parts[0] === 'routes') {
    return parts[1] ?? 'routes';
  }
  return parts[0];
}

function componentRoleHint(component) {
  const name = component.className.toLowerCase();
  const folders = component.relativePath.toLowerCase();

  if (name.includes('dashboard') || name.includes('overview') || name.includes('home')) {
    return 'landing or overview surface';
  }
  if (name.includes('editor') || name.includes('builder') || name.includes('composer')) {
    return 'authoring or editing surface';
  }
  if (name.includes('simulate') || name.includes('simulation') || name.includes('shadow')) {
    return 'simulation and what-if analysis surface';
  }
  if (name.includes('approval') || name.includes('review')) {
    return 'approval and review surface';
  }
  if (name.includes('wizard') || name.includes('setup')) {
    return 'setup or guided workflow surface';
  }
  if (name.includes('audit') || folders.includes('/audit')) {
    return 'audit and evidence surface';
  }
  if (name.includes('drawer') || name.includes('panel') || name.includes('detail')) {
    return 'detail panel or supporting drill-down surface';
  }
  if (name.includes('watch') || name.includes('alert') || name.includes('notify')) {
    return 'monitoring and alerting surface';
  }
  if (name.includes('visual') || name.includes('graph') || name.includes('timeline')) {
    return 'visualization or exploration surface';
  }
  return 'dedicated feature surface';
}

function describeApparentPurpose(component) {
  const pathBits = component.relativePath
    .replace(/^features\//, '')
    .replace(/^shared\//, '')
    .replace(/^layout\//, '')
    .replace(/\/[^/]+\.component\.ts$/, '')
    .split('/')
    .filter(Boolean)
    .map(titleCase);

  const area = pathBits.length > 0 ? pathBits.join(' / ') : titleCase(component.family);
  return `${humanizeComponentName(component.className)} appears to be a ${componentRoleHint(component)} in the ${area} area.`;
}

function pathToDocLink(filePath) {
  return repoRel(filePath);
}

function defaultBranchTitle(family) {
  return titleCase(family);
}

const BRANCH_RULES = [
  {
    key: 'policy-studio',
    test: (component) => component.relativePath.startsWith('features/policy-studio/'),
    title: 'Policy Studio Legacy',
    branchWhat: 'Legacy all-in-one policy authoring, approvals, dashboard, and simulation surfaces from the older IA.',
    recommendation: 'merge',
    preservationValue: 'high',
    whyDropped: 'The current route tree moved policy work into newer governance and simulation surfaces, leaving the old `/policy-studio` family unmounted.',
    preserve: 'Keep the authoring concepts, simulation affordances, approvals flow, and any editor UX that is stronger than the current split surfaces.',
    likelyDestination: '/admin/policy/governance and /admin/policy/simulation',
    relatedDocs: [
      'docs/contracts/policy-studio.md',
      'docs/modules/ui/v2-rewire/source-of-truth.md',
    ],
  },
  {
    key: 'release-control',
    test: (component) => component.relativePath.startsWith('features/release-control/'),
    title: 'Release Control Legacy',
    branchWhat: 'Pre-rewire release-control setup, governance, and landing pages retained after the route migration.',
    recommendation: 'archive',
    preservationValue: 'low',
    whyDropped: 'The canonical IA now redirects old `release-control/*` concepts into `/releases`, `/ops`, and `/setup`, so the original surfaces no longer anchor the product.',
    preserve: 'Preserve only reusable copy, sequencing, or setup checklists that still improve the newer release and topology flows.',
    likelyDestination: '/releases, /ops/platform-setup, and /setup/topology',
    relatedDocs: [
      'docs/modules/ui/v2-rewire/S00_route_deprecation_map.md',
      'docs/modules/ui/v2-rewire/source-of-truth.md',
    ],
  },
  {
    key: 'platform-ops',
    test: (component) => component.relativePath.startsWith('features/platform-ops/'),
    title: 'Platform Ops Legacy',
    branchWhat: 'Older operations console pages from before the current `/ops` shell consolidation.',
    recommendation: 'merge',
    preservationValue: 'medium',
    whyDropped: 'Ops views were consolidated under the newer platform and operations route families, leaving the older platform-ops pages behind.',
    preserve: 'Keep distinctive observability widgets, platform state views, and telemetry interactions that are still missing from the current ops pages.',
    likelyDestination: '/ops and /ops/platform-setup',
    relatedDocs: [
      'docs/modules/platform/architecture-overview.md',
      'docs/modules/ui/v2-rewire/source-of-truth.md',
    ],
  },
  {
    key: 'workflow-visualization',
    test: (component) => component.relativePath.startsWith('features/workflow-visualization/'),
    title: 'Workflow Visualization Prototype',
    branchWhat: 'A prototype workflow explorer with time-travel and step drill-down concepts.',
    recommendation: 'investigate',
    preservationValue: 'medium',
    whyDropped: 'The route file exists, but nothing mounts the workflow visualization branch in the active shell.',
    preserve: 'Keep the timeline, step-diff, and replay ideas if they can strengthen evidence or release run introspection.',
    likelyDestination: '/evidence or /releases/runs',
    relatedDocs: [
      'docs/modules/ui/architecture.md',
      'docs/modules/platform/architecture-overview.md',
    ],
  },
  {
    key: 'watchlist',
    test: (component) => component.relativePath.startsWith('features/watchlist/'),
    title: 'Watchlist',
    branchWhat: 'Operator watchlist and monitoring surfaces backed by a real client/provider but not wired into navigation.',
    recommendation: 'wire-in',
    preservationValue: 'high',
    whyDropped: 'The feature appears partially implemented but never surfaced in the current route tree or menu.',
    preserve: 'Keep the operational watchlist concept, status views, and monitoring workflows; this looks closer to productizable than many other dead branches.',
    likelyDestination: '/mission-control or /ops',
    relatedDocs: [
      'docs/operations/watchlist-monitoring-runbook.md',
      'docs/modules/platform/architecture-overview.md',
    ],
  },
  {
    key: 'reachability',
    test: (component) => component.relativePath.startsWith('features/reachability/'),
    title: 'Reachability Witnessing',
    branchWhat: 'Reachability proof, witness, and proof-of-exploit supporting surfaces.',
    recommendation: 'merge',
    preservationValue: 'high',
    whyDropped: 'The supporting pages and drawers are not mounted even though reachability remains a core Stella Ops differentiator.',
    preserve: 'Keep witness capture, proof overlays, and explainability flows that can reinforce policy and evidence decisions.',
    likelyDestination: '/security/reachability or /evidence',
    relatedDocs: [
      'docs/modules/platform/architecture-overview.md',
      'docs/modules/ui/architecture.md',
    ],
  },
  {
    key: 'vex-studio',
    test: (component) => component.relativePath.startsWith('features/vex-studio/'),
    title: 'VEX Studio',
    branchWhat: 'Conflict-resolution and authoring surfaces around VEX decisions.',
    recommendation: 'merge',
    preservationValue: 'high',
    whyDropped: 'The standalone studio is not mounted, but related VEX concepts and data structures still appear to matter elsewhere.',
    preserve: 'Keep conflict resolution workflows, rationale capture, and consensus tooling that could strengthen VEX Hub.',
    likelyDestination: '/admin/vex-hub',
    relatedDocs: [
      'docs/modules/platform/architecture-overview.md',
      'docs/modules/ui/architecture.md',
    ],
  },
  {
    key: 'triage',
    test: (component) => component.relativePath.startsWith('features/triage/'),
    title: 'Triage Workbench',
    branchWhat: 'Triage experiments, workbenches, and audit-bundle side surfaces around artifact analysis.',
    recommendation: 'merge',
    preservationValue: 'medium',
    whyDropped: 'Several triage surfaces read as design experiments that were never folded cleanly into the main artifact workspace.',
    preserve: 'Keep any explainability, quiet-lane, or audit-bundle interactions that meaningfully shorten operator triage loops.',
    likelyDestination: '/triage/artifacts or /evidence',
    relatedDocs: [
      'docs/modules/platform/architecture-overview.md',
      'docs/modules/ui/architecture.md',
    ],
  },
  {
    key: 'policy-governance',
    test: (component) => component.relativePath.startsWith('features/policy-governance/'),
    title: 'Policy Governance',
    branchWhat: 'Current policy governance admin subtree that looks real but still needs surface verification.',
    recommendation: 'preserve',
    preservationValue: 'high',
    whyDropped: 'These pages are routed but some leaves are weakly surfaced in static analysis because their navigation appears to rely on local tabs or relative routing.',
    preserve: 'Preserve the full governance branch; the main question is wiring quality, not product value.',
    likelyDestination: '/admin/policy/governance',
    relatedDocs: [
      'docs/modules/ui/v2-rewire/source-of-truth.md',
      'docs/contracts/policy-studio.md',
    ],
  },
  {
    key: 'policy-simulation',
    test: (component) => component.relativePath.startsWith('features/policy-simulation/'),
    title: 'Policy Simulation',
    branchWhat: 'Current policy simulation admin subtree that likely remains product-relevant.',
    recommendation: 'preserve',
    preservationValue: 'high',
    whyDropped: 'Static scans can miss child-tab flows, so weak surfacing here does not imply abandonment.',
    preserve: 'Preserve shadow mode, scenario comparison, and simulation drill-down surfaces; focus on navigation evidence before cutting anything.',
    likelyDestination: '/admin/policy/simulation',
    relatedDocs: [
      'docs/modules/ui/v2-rewire/source-of-truth.md',
      'docs/contracts/policy-studio.md',
    ],
  },
];

function resolveBranchRule(component) {
  return BRANCH_RULES.find((rule) => rule.test(component)) ?? {
    key: component.family,
    title: defaultBranchTitle(component.family),
    branchWhat: `${defaultBranchTitle(component.family)} components grouped from the static unused-component scan.`,
    recommendation: component.classification === 'dead' ? 'investigate' : 'preserve',
    preservationValue: component.classification === 'dead' ? 'medium' : 'high',
    whyDropped: component.classification === 'dead'
      ? 'No route or runtime references remain in the current Angular shell, which suggests the surface was dropped or replaced.'
      : 'The component is still routed, but the current scan did not find an obvious menu or absolute page-action path to it.',
    preserve: 'Preserve the underlying workflow only if current product docs still claim the capability or if the component contains unique UI concepts.',
    likelyDestination: 'Needs branch-level review against current IA',
    relatedDocs: [
      'docs/modules/ui/README.md',
      'docs/modules/ui/architecture.md',
    ],
  };
}

function scanComponents() {
  const componentFiles = walk(appRoot).filter((filePath) => filePath.endsWith('.component.ts'));
  const components = [];

  for (const filePath of componentFiles) {
    const sourceText = read(filePath);
    const sourceFile = ts.createSourceFile(filePath, sourceText, ts.ScriptTarget.Latest, true);

    for (const statement of sourceFile.statements) {
      if (!ts.isClassDeclaration(statement) || !statement.name) {
        continue;
      }

      const decorators = getDecorators(statement);
      const componentDecorator = decorators.find((decorator) => {
        const expression = decorator.expression;
        return ts.isCallExpression(expression) && expression.expression.getText(sourceFile) === 'Component';
      });

      if (!componentDecorator) {
        continue;
      }

      const expression = componentDecorator.expression;
      const config = ts.isCallExpression(expression) ? expression.arguments[0] : null;
      const selector = config && ts.isObjectLiteralExpression(config)
        ? getStringProperty(config, 'selector')
        : null;

      const relativePath = appRel(filePath);
      components.push({
        className: statement.name.text,
        selector,
        filePath,
        relativePath,
        family: deriveFamily(relativePath),
      });
    }
  }

  return components.sort((left, right) => left.relativePath.localeCompare(right.relativePath));
}

function isRouteArray(node) {
  if (!ts.isArrayLiteralExpression(node)) {
    return false;
  }
  return node.elements.some((element) => {
    return ts.isObjectLiteralExpression(element) && getObjectProperty(element, 'path');
  });
}

function getLoadTarget(initializer, sourceFile) {
  if (!initializer) {
    return null;
  }

  const text = initializer.getText(sourceFile);
  const importMatch = text.match(/import\(['"`](.+?)['"`]\)/);
  const exportMatch = text.match(/=>\s*[A-Za-z0-9_]+\.(\w+)/);

  if (!importMatch || !exportMatch) {
    return null;
  }

  return {
    importPath: importMatch[1],
    exportName: exportMatch[1],
  };
}

function resolveTsModule(fromFile, importPath) {
  const absoluteBase = path.resolve(path.dirname(fromFile), importPath);
  const candidates = [
    `${absoluteBase}.ts`,
    path.join(absoluteBase, 'index.ts'),
  ];

  return candidates.find((candidate) => fs.existsSync(candidate)) ?? null;
}

function loadRouteFile(filePath, cache) {
  if (cache.has(filePath)) {
    return cache.get(filePath);
  }

  const sourceText = read(filePath);
  const sourceFile = ts.createSourceFile(filePath, sourceText, ts.ScriptTarget.Latest, true);
  const arrays = new Map();

  function visit(node) {
    if (ts.isVariableDeclaration(node) && ts.isIdentifier(node.name) && node.initializer && isRouteArray(node.initializer)) {
      arrays.set(node.name.text, node.initializer);
    }
    ts.forEachChild(node, visit);
  }

  visit(sourceFile);

  const parsed = { sourceFile, arrays };
  cache.set(filePath, parsed);
  return parsed;
}

function collectRoutesFromArray(filePath, exportName, prefix, cache, visited, routeIndex) {
  const visitKey = `${filePath}::${exportName}::${prefix}`;
  if (visited.has(visitKey)) {
    return;
  }
  visited.add(visitKey);

  const parsed = loadRouteFile(filePath, cache);
  const arrayNode = parsed.arrays.get(exportName);
  if (!arrayNode) {
    return;
  }

  collectRouteArray(filePath, parsed.sourceFile, arrayNode, prefix, cache, visited, routeIndex);
}

function collectRouteArray(filePath, sourceFile, arrayNode, prefix, cache, visited, routeIndex) {
  for (const element of arrayNode.elements) {
    if (!ts.isObjectLiteralExpression(element)) {
      continue;
    }
    collectRouteObject(filePath, sourceFile, element, prefix, cache, visited, routeIndex);
  }
}

function collectRouteObject(filePath, sourceFile, objectLiteral, prefix, cache, visited, routeIndex) {
  const routePath = getStringProperty(objectLiteral, 'path') ?? '';
  const fullPath = joinRoute(prefix, routePath);
  const componentName =
    getIdentifierProperty(objectLiteral, 'component') ||
    (function () {
      const loadComponent = getObjectProperty(objectLiteral, 'loadComponent');
      if (!loadComponent) {
        return null;
      }
      const text = loadComponent.getText(sourceFile);
      const match = text.match(/=>\s*[A-Za-z0-9_]+\.(\w+)/);
      return match ? match[1] : null;
    })();

  if (componentName) {
    const current = routeIndex.get(componentName) ?? [];
    current.push({
      path: fullPath,
      routeFile: repoRel(filePath),
    });
    routeIndex.set(componentName, current);
  }

  const children = getArrayProperty(objectLiteral, 'children');
  if (children) {
    collectRouteArray(filePath, sourceFile, children, fullPath, cache, visited, routeIndex);
  }

  const loadChildren = getLoadTarget(getObjectProperty(objectLiteral, 'loadChildren'), sourceFile);
  if (!loadChildren) {
    return;
  }

  const targetFile = resolveTsModule(filePath, loadChildren.importPath);
  if (!targetFile) {
    return;
  }

  collectRoutesFromArray(targetFile, loadChildren.exportName, fullPath, cache, visited, routeIndex);
}

function buildRouteIndex() {
  const routeIndex = new Map();
  const cache = new Map();
  const visited = new Set();
  const rootRoutesFile = path.join(appRoot, 'app.routes.ts');
  collectRoutesFromArray(rootRoutesFile, 'routes', '/', cache, visited, routeIndex);

  for (const [componentName, entries] of routeIndex.entries()) {
    const deduped = sortUnique(entries.map((entry) => `${entry.path}@@${entry.routeFile}`)).map((value) => {
      const [routePath, routeFile] = value.split('@@');
      return { path: routePath, routeFile };
    });
    routeIndex.set(componentName, deduped);
  }

  return routeIndex;
}

function buildTextIndex() {
  const files = walk(appRoot).filter((filePath) => /\.(ts|html|scss)$/.test(filePath));
  return files.map((filePath) => ({
    filePath,
    relativePath: appRel(filePath),
    text: read(filePath),
  }));
}

function findRuntimeRefs(component, textIndex) {
  const refs = [];
  for (const file of textIndex) {
    if (file.filePath === component.filePath) {
      continue;
    }
    if (isSpecOrStory(file.filePath) || isRouteFile(file.filePath)) {
      continue;
    }

    if (file.text.includes(component.className) || (component.selector && file.text.includes(component.selector))) {
      refs.push(file.relativePath);
    }
  }
  return sortUnique(refs);
}

function buildRouteSurfaceIndex(textIndex) {
  const menuRoutes = new Map();
  const actionRoutes = new Map();

  for (const file of textIndex) {
    if (isRouteFile(file.filePath) || isSpecOrStory(file.filePath)) {
      continue;
    }

    const target = MENU_FILES.includes(path.normalize(file.filePath)) ? menuRoutes : actionRoutes;
    for (const routePath of extractAbsoluteRoutes(file.text)) {
      const files = target.get(routePath) ?? [];
      files.push(file.relativePath);
      target.set(routePath, sortUnique(files));
    }
  }

  return { menuRoutes, actionRoutes };
}

function classifyComponents(components, routeIndex, textIndex, routeSurfaceIndex) {
  const candidates = [];

  for (const component of components) {
    const routeEntries = routeIndex.get(component.className) ?? [];
    const routePaths = sortUnique(routeEntries.map((entry) => entry.path));
    const routeFiles = sortUnique(routeEntries.map((entry) => entry.routeFile));
    const runtimeRefs = findRuntimeRefs(component, textIndex);
    const menuSurfaceFiles = sortUnique(
      routePaths.flatMap((routePath) => routeSurfaceIndex.menuRoutes.get(routePath) ?? [])
    );
    const actionSurfaceFiles = sortUnique(
      routePaths.flatMap((routePath) => routeSurfaceIndex.actionRoutes.get(routePath) ?? [])
    );

    let classification = null;
    let confidence = null;
    if (routePaths.length === 0 && runtimeRefs.length === 0) {
      classification = 'dead';
      confidence = 'high';
    } else if (routePaths.length > 0 && runtimeRefs.length === 0 && menuSurfaceFiles.length === 0 && actionSurfaceFiles.length === 0) {
      classification = 'weak-route';
      confidence = 'medium';
    }

    if (!classification) {
      continue;
    }

    const enriched = {
      ...component,
      routePaths,
      routeFiles,
      runtimeRefs,
      menuSurfaceFiles,
      actionSurfaceFiles,
      classification,
      confidence,
    };
    const branch = resolveBranchRule(enriched);
    candidates.push({
      ...enriched,
      branchKey: branch.key,
      branchTitle: branch.title,
      branchWhat: branch.branchWhat,
      recommendation: branch.recommendation,
      preservationValue: branch.preservationValue,
      whyDropped: branch.whyDropped,
      preserve: branch.preserve,
      likelyDestination: branch.likelyDestination,
      relatedDocs: branch.relatedDocs,
    });
  }

  return candidates.sort((left, right) => {
    if (left.classification !== right.classification) {
      return left.classification.localeCompare(right.classification);
    }
    if (left.branchKey !== right.branchKey) {
      return left.branchKey.localeCompare(right.branchKey);
    }
    return left.relativePath.localeCompare(right.relativePath);
  });
}

function toComponentDocPath(component) {
  const parts = component.relativePath.split('/');
  const fileName = `${component.className}.md`;
  const sourceDirParts = parts.slice(0, -1).map(slugify).filter(Boolean);
  return path.join(outRoot, 'components', component.classification, ...sourceDirParts, fileName);
}

function toBranchIndexPath(classification, family) {
  return path.join(outRoot, 'components', classification, slugify(family), 'README.md');
}

function relativeLink(fromFile, toFile) {
  return path.relative(path.dirname(fromFile), toFile).replace(/\\/g, '/');
}

function markdownList(values) {
  if (!values || values.length === 0) {
    return '- none';
  }
  return values.map((value) => `- \`${value}\``).join('\n');
}

function nextPassQuestions(component) {
  if (component.classification === 'weak-route') {
    return [
      'Confirm whether the route is reachable only through relative child-tab navigation.',
      'Check the corresponding product/docs promise before treating the page as dropped.',
      'Verify whether the route should be linked from the current shell or intentionally remain deep-linked only.',
    ];
  }

  return [
    'Check whether newer routed pages already absorbed this workflow under a different name.',
    'Review component templates and services for reusable UX or domain language worth salvaging.',
    'Validate the preservation call against current Stella Ops product docs before archival.',
  ];
}

function renderComponentDoc(component, docPath) {
  const routeBlock = component.routePaths.length > 0 ? markdownList(component.routePaths) : '- none';
  const routeFileBlock = component.routeFiles.length > 0 ? markdownList(component.routeFiles) : '- none';
  const menuBlock = component.menuSurfaceFiles.length > 0 ? markdownList(component.menuSurfaceFiles) : '- none';
  const actionBlock = component.actionSurfaceFiles.length > 0 ? markdownList(component.actionSurfaceFiles) : '- none';
  const runtimeBlock = component.runtimeRefs.length > 0 ? markdownList(component.runtimeRefs) : '- none';
  const questions = nextPassQuestions(component).map((item) => `- ${item}`).join('\n');
  const docsBlock = component.relatedDocs.length > 0
    ? component.relatedDocs.map((doc) => `- [${doc}](${relativeLink(docPath, path.join(repoRoot, doc))})`).join('\n')
    : '- none';

  return `# ${component.className}

## Status Snapshot
- Classification: \`${component.classification}\`
- Confidence: \`${component.confidence}\`
- Recommendation: \`${component.recommendation}\`
- Preservation value: \`${component.preservationValue}\`
- Feature branch: \`${component.branchTitle}\`
- Source: \`${component.relativePath}\`
- Selector: \`${component.selector ?? 'n/a'}\`

## What Is It?
${describeApparentPurpose(component)}

## Why It Likely Fell Out Of The Product
${component.whyDropped}

## What Is Worth Preserving
${component.preserve}

## Likely Successor Or Merge Target
${component.likelyDestination}

## Static Evidence
### Routed paths
${routeBlock}

### Route files
${routeFileBlock}

### Menu surfaces
${menuBlock}

### Absolute page-action surfaces
${actionBlock}

### Runtime references outside routes/tests
${runtimeBlock}

## Related Docs
${docsBlock}

## Next-Pass Questions
${questions}
`;
}

function renderBranchIndex(classification, family, items) {
  const branch = items[0];
  const grouped = items
    .slice()
    .sort((left, right) => left.relativePath.localeCompare(right.relativePath))
    .map((item) => {
      const docPath = toComponentDocPath(item);
      return `- [${item.className}](${relativeLink(toBranchIndexPath(classification, family), docPath)}) - \`${item.recommendation}\`, ${item.relativePath}`;
    })
    .join('\n');

  return `# ${branch.branchTitle}

## Branch Summary
- Classification bucket: \`${classification}\`
- Components in branch: ${items.length}
- Default recommendation: \`${branch.recommendation}\`
- Preservation value: \`${branch.preservationValue}\`

${branch.branchWhat}

## Why This Branch Matters
${branch.preserve}

## Likely Destination
${branch.likelyDestination}

## Components
${grouped}
`;
}

function renderSummaryTree(branches) {
  const lines = [
    '# Summary Tree',
    '',
    `Generated on ${GENERATION_DATE}. This is the branch-level view of candidate unused or weakly surfaced UI families.`,
    '',
  ];

  for (const [classification, branchMap] of branches.entries()) {
    lines.push(`## ${titleCase(classification)}`);
    lines.push('');
    for (const [, items] of branchMap.entries()) {
      const branch = items[0];
      lines.push(`- ${branch.branchTitle}`);
      lines.push(`  what: ${branch.branchWhat}`);
      lines.push(`  keep: ${branch.preserve}`);
      lines.push(`  action: \`${branch.recommendation}\``);
      lines.push(`  why: ${branch.whyDropped}`);
      lines.push(`  count: ${items.length} components`);
    }
    lines.push('');
  }

  return `${lines.join('\n')}\n`;
}

function renderRootReadme(candidates, branches) {
  const totals = new Map();
  for (const candidate of candidates) {
    totals.set(candidate.classification, (totals.get(candidate.classification) ?? 0) + 1);
  }

  const lines = [
    '# UI Component Preservation Map',
    '',
    `Generated on ${GENERATION_DATE}. This map captures Angular components that currently look either high-confidence dead or routed-but-weakly-surfaced in the Stella Ops web console.`,
    '',
    '## How To Read This Map',
    '- `dead`: no active route target and no runtime references outside tests/stories.',
    '- `weak-route`: still routed, but the current static scan found no menu entry and no obvious absolute page-action path to the route.',
    '- Recommendation labels are intentionally constrained: `archive`, `merge`, `preserve`, `wire-in`, `investigate`.',
    '',
    '## Counts',
    `- Dead components: ${totals.get('dead') ?? 0}`,
    `- Weak-route components: ${totals.get('weak-route') ?? 0}`,
    `- Total candidates: ${candidates.length}`,
    '',
    '## Main Artifacts',
    '- [Summary Tree](./SUMMARY_TREE.md)',
    '- [Inventory JSON](./inventory.json)',
    '',
    '## Branch Index',
  ];

  for (const [classification, branchMap] of branches.entries()) {
    lines.push(`### ${titleCase(classification)}`);
    for (const [family, items] of branchMap.entries()) {
      const branchFile = toBranchIndexPath(classification, family);
      const branch = items[0];
      lines.push(`- [${branch.branchTitle}](./${repoRel(branchFile).replace(/^docs\/modules\/ui\/component-preservation-map\//, '')}) - ${items.length} components, default \`${branch.recommendation}\``);
    }
    lines.push('');
  }

  lines.push('## Notes');
  lines.push('- This is a first-pass map. The weak-route bucket especially needs follow-up review against relative tab navigation and Stella Ops product docs.');
  lines.push('- Per-component dossiers are intentionally stable so later iterations can deepen the judgment rather than recreate the inventory.');

  return `${lines.join('\n')}\n`;
}

function groupBranches(candidates) {
  const branches = new Map();
  for (const candidate of candidates) {
    const classificationMap = branches.get(candidate.classification) ?? new Map();
    const branchItems = classificationMap.get(candidate.branchKey) ?? [];
    branchItems.push(candidate);
    classificationMap.set(candidate.branchKey, branchItems);
    branches.set(candidate.classification, classificationMap);
  }

  for (const [, branchMap] of branches.entries()) {
    for (const [, items] of branchMap.entries()) {
      items.sort((left, right) => left.relativePath.localeCompare(right.relativePath));
    }
  }

  return branches;
}

function cleanOutput() {
  if (!fs.existsSync(outRoot)) {
    return;
  }

  for (const entry of fs.readdirSync(outRoot, { withFileTypes: true })) {
    if (entry.name === '_tools') {
      continue;
    }

    const target = path.join(outRoot, entry.name);
    fs.rmSync(target, { recursive: true, force: true });
  }
}

function main() {
  cleanOutput();

  const components = scanComponents();
  const routeIndex = buildRouteIndex();
  const textIndex = buildTextIndex();
  const routeSurfaceIndex = buildRouteSurfaceIndex(textIndex);
  const candidates = classifyComponents(components, routeIndex, textIndex, routeSurfaceIndex);
  const branches = groupBranches(candidates);

  for (const candidate of candidates) {
    const docPath = toComponentDocPath(candidate);
    write(docPath, renderComponentDoc(candidate, docPath));
  }

  for (const [classification, branchMap] of branches.entries()) {
    for (const [family, items] of branchMap.entries()) {
      write(toBranchIndexPath(classification, family), renderBranchIndex(classification, family, items));
    }
  }

  write(path.join(outRoot, 'README.md'), renderRootReadme(candidates, branches));
  write(path.join(outRoot, 'SUMMARY_TREE.md'), renderSummaryTree(branches));
  write(
    path.join(outRoot, 'inventory.json'),
    `${JSON.stringify({
      generatedOn: GENERATION_DATE,
      counts: {
        dead: candidates.filter((item) => item.classification === 'dead').length,
        weakRoute: candidates.filter((item) => item.classification === 'weak-route').length,
        total: candidates.length,
      },
      candidates: candidates.map((candidate) => ({
        className: candidate.className,
        selector: candidate.selector,
        classification: candidate.classification,
        confidence: candidate.confidence,
        recommendation: candidate.recommendation,
        preservationValue: candidate.preservationValue,
        family: candidate.family,
        branchKey: candidate.branchKey,
        branchTitle: candidate.branchTitle,
        source: candidate.relativePath,
        routePaths: candidate.routePaths,
        routeFiles: candidate.routeFiles,
        menuSurfaceFiles: candidate.menuSurfaceFiles,
        actionSurfaceFiles: candidate.actionSurfaceFiles,
        runtimeRefs: candidate.runtimeRefs,
        relatedDocs: candidate.relatedDocs,
        likelyDestination: candidate.likelyDestination,
      })),
    }, null, 2)}\n`
  );

  const counts = candidates.reduce((accumulator, candidate) => {
    accumulator[candidate.classification] = (accumulator[candidate.classification] ?? 0) + 1;
    return accumulator;
  }, {});

  console.log(JSON.stringify({
    generatedOn: GENERATION_DATE,
    counts,
    totalCandidates: candidates.length,
    outputRoot: repoRel(outRoot),
  }, null, 2));
}

main();