# All files / src/semantic domain-inference.ts

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84.21% Branches 48/57
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100% Lines 77/77

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     import type {
      DependencyGraph,
      DomainAssignment,
      DomainSignals,
      ExportInfo,
    } from '../types';
    import { singularize } from '../utils/string-utils';

    /**
     * Calculate confidence score for a domain assignment based on signals.
     *
     * @param signals - The set of semantic signals detected for a domain.
     * @returns Numerical confidence score (0-1).
     */
    export function calculateDomainConfidence(signals: DomainSignals): number {
      const weights = {
        coUsage: 0.35,
        typeReference: 0.3,
        exportName: 0.15,
        importPath: 0.1,
        folderStructure: 0.1,
      };
      let confidence = 0;
      if (signals.coUsage) confidence += weights.coUsage;
      if (signals.typeReference) confidence += weights.typeReference;
      if (signals.exportName) confidence += weights.exportName;
      if (signals.importPath) confidence += weights.importPath;
      if (signals.folderStructure) confidence += weights.folderStructure;
      return confidence;
    }

    /**
     * Infer domain from semantic analysis (co-usage + types) to identify logical modules.
     *
     * @param file - The file path to infer domain for.
     * @param exportName - The specific export identifier.
     * @param graph - The full dependency graph.
     * @param coUsageMatrix - Matrix of files frequently imported together.
     * @param typeGraph - Map of type references to files.
     * @param exportTypeRefs - Optional list of types referenced by the export.
     * @returns Array of potential domain assignments with confidence scores.
     */
    export function inferDomainFromSemantics(
      file: string,
      exportName: string,
      graph: DependencyGraph,
      coUsageMatrix: Map<string, Map<string, number>>,
      typeGraph: Map<string, Set<string>>,
      exportTypeRefs?: string[]
    ): DomainAssignment[] {
      const domainSignals = new Map<string, DomainSignals>();

      const coUsages = coUsageMatrix.get(file) || new Map();
      const strongCoUsages = Array.from(coUsages.entries())
        .filter(([, count]) => count >= 3)
        .map(([coFile]) => coFile);

      for (const coFile of strongCoUsages) {
        const coNode = graph.nodes.get(coFile);
        Eif (coNode) {
          for (const exp of coNode.exports) {
            Eif (exp.inferredDomain && exp.inferredDomain !== 'unknown') {
              const domain = exp.inferredDomain;
              Eif (!domainSignals.has(domain)) {
                domainSignals.set(domain, {
                  coUsage: false,
                  typeReference: false,
                  exportName: false,
                  importPath: false,
                  folderStructure: false,
                });
              }
              domainSignals.get(domain)!.coUsage = true;
            }
          }
        }
      }

      if (exportTypeRefs) {
        for (const typeRef of exportTypeRefs) {
          const filesWithType = typeGraph.get(typeRef);
          Eif (filesWithType) {
            for (const typeFile of filesWithType) {
              Iif (typeFile === file) continue;
              const typeNode = graph.nodes.get(typeFile);
              Eif (typeNode) {
                for (const exp of typeNode.exports) {
                  Eif (exp.inferredDomain && exp.inferredDomain !== 'unknown') {
                    const domain = exp.inferredDomain;
                    Eif (!domainSignals.has(domain)) {
                      domainSignals.set(domain, {
                        coUsage: false,
                        typeReference: false,
                        exportName: false,
                        importPath: false,
                        folderStructure: false,
                      });
                    }
                    domainSignals.get(domain)!.typeReference = true;
                  }
                }
              }
            }
          }
        }
      }

      const assignments: DomainAssignment[] = [];
      for (const [domain, signals] of domainSignals) {
        const confidence = calculateDomainConfidence(signals);
        Eif (confidence >= 0.3) assignments.push({ domain, confidence, signals });
      }

      assignments.sort((a, b) => b.confidence - a.confidence);
      return assignments;
    }

    /**
     * Regex-based export extraction (legacy/fallback)
     *
     * @param content - Source code content.
     * @param filePath - Optional file path for domain context.
     * @param domainOptions - Optional overrides for domain keywords.
     * @param fileImports - Optional list of actual imports for semantic context.
     * @returns Array of extracted export information.
     */
    export function extractExports(
      content: string,
      filePath?: string,
      domainOptions?: { domainKeywords?: string[] },
      fileImports?: string[]
    ): ExportInfo[] {
      const exports: ExportInfo[] = [];
      const patterns = [
        /export\s+function\s+(\w+)/g,
        /export\s+class\s+(\w+)/g,
        /export\s+const\s+(\w+)/g,
        /export\s+type\s+(\w+)/g,
        /export\s+interface\s+(\w+)/g,
        /export\s+default/g,
      ];

      const types: ExportInfo['type'][] = [
        'function',
        'class',
        'const',
        'type',
        'interface',
        'default',
      ];

      patterns.forEach((pattern, index) => {
        let match;
        while ((match = pattern.exec(content)) !== null) {
          const name = match[1] || 'default';
          const type = types[index];
          const inferredDomain = inferDomain(
            name,
            filePath,
            domainOptions,
            fileImports
          );
          exports.push({ name, type, inferredDomain });
        }
      });

      return exports;
    }

    /**
     * Infer domain from name, path, or imports
     *
     * @param name - The identifier name to analyze.
     * @param filePath - Optional file path for structure context.
     * @param domainOptions - Optional overrides for domain keywords.
     * @param fileImports - Optional list of imports for domain context.
     * @returns The inferred domain name (string).
     */
    export function inferDomain(
      name: string,
      filePath?: string,
      domainOptions?: { domainKeywords?: string[] },
      fileImports?: string[]
    ): string {
      const lower = name.toLowerCase();
      const tokens = Array.from(
        new Set(
          lower
            .replace(/([a-z0-9])([A-Z])/g, '$1 $2')
            .replace(/[^a-z0-9]+/gi, ' ')
            .split(' ')
            .filter(Boolean)
        )
      );

      const defaultKeywords = [
        'authentication',
        'authorization',
        'payment',
        'invoice',
        'customer',
        'product',
        'order',
        'cart',
        'user',
        'admin',
        'repository',
        'controller',
        'service',
        'config',
        'model',
        'view',
        'auth',
      ];

      const domainKeywords = domainOptions?.domainKeywords?.length
        ? [...domainOptions.domainKeywords, ...defaultKeywords]
        : defaultKeywords;

      for (const keyword of domainKeywords) {
        if (tokens.includes(keyword)) return keyword;
      }

      for (const keyword of domainKeywords) {
        if (lower.includes(keyword)) return keyword;
      }

      if (fileImports) {
        for (const importPath of fileImports) {
          const segments = importPath.split('/');
          for (const segment of segments) {
            const segLower = segment.toLowerCase();
            const singularSegment = singularize(segLower);
            for (const keyword of domainKeywords) {
              if (
                singularSegment === keyword ||
                segLower === keyword ||
                segLower.includes(keyword)
              )
                return keyword;
            }
          }
        }
      }

      if (filePath) {
        const segments = filePath.split('/');
        for (const segment of segments) {
          const segLower = segment.toLowerCase();
          const singularSegment = singularize(segLower);
          for (const keyword of domainKeywords) {
            if (singularSegment === keyword || segLower === keyword) return keyword;
          }
        }
      }

      return 'unknown';
    }