{
  "item_type": "chapter",
  "chapter_id": "functional-analysis",
  "chapter_title": "Functional Composition Analysis",
  "chapter_file": "book/src/functional-analysis.md",
  "drift_detected": false,
  "severity": "good",
  "quality_assessment": "Excellent documentation with comprehensive coverage of functional composition analysis features. All documented features match the implementation. Previous drift issues (broken links, missing module references) have been resolved.",
  "issues": [],
  "positive_aspects": [
    "Comprehensive documentation of all three configuration profiles (strict, balanced, lenient) with accurate threshold values",
    "Accurate CLI flag documentation for --ast-functional-analysis and --functional-analysis-profile",
    "Correct explanation of both purity classification systems (three-level for god object scoring, four-level for detailed analysis)",
    "Complete documentation of all pipeline stages (Iterator, Map, Filter, Fold, FlatMap, Inspect, AndThen, MapErr)",
    "Accurate terminal operation documentation (Collect, Sum, Count, Any, All, Find, Reduce, ForEach)",
    "Clear distinction between builder patterns and functional pipelines",
    "Proper cross-references to related chapters - all links now valid",
    "Thorough troubleshooting section with practical solutions",
    "Best practices section with actionable guidance",
    "Migration guide for enabling functional analysis on existing projects",
    "Clear code examples demonstrating pure vs impure functions",
    "Accurate description of purity weight multipliers (0.3, 0.5, 1.0)",
    "Well-structured profile selection guidance (when to use strict vs balanced vs lenient)",
    "Correct references to integration modules (unified_analysis.rs, multi_signal_aggregation.rs) - both exist"
  ],
  "improvement_suggestions": [
    "The specification link (https://github.com/yourusername/debtmap/specs/111) uses a placeholder URL that should be updated to the actual project URL",
    "Consider adding a section on performance benchmarks for functional analysis overhead",
    "Could benefit from more examples showing the actual output format of functional analysis results"
  ],
  "verified_source_references": [
    {
      "documented_reference": "src/organization/purity_analyzer.rs:19-26",
      "actual_location": "src/organization/purity_analyzer.rs:17-26",
      "status": "accurate"
    },
    {
      "documented_reference": "src/organization/purity_analyzer.rs:29-39",
      "actual_location": "src/organization/purity_analyzer.rs:29-39",
      "status": "accurate"
    },
    {
      "documented_reference": "src/core/mod.rs:47-60",
      "actual_location": "src/core/mod.rs:43-62",
      "status": "accurate"
    },
    {
      "documented_reference": "src/analysis/purity_analysis.rs:34-43",
      "actual_location": "src/analysis/purity_analysis.rs:33-43",
      "status": "accurate"
    },
    {
      "documented_reference": "src/analysis/functional_composition.rs",
      "status": "verified_exists"
    },
    {
      "documented_reference": "src/builders/unified_analysis.rs",
      "status": "verified_exists"
    },
    {
      "documented_reference": "src/analysis/multi_signal_aggregation.rs",
      "status": "verified_exists"
    }
  ],
  "internal_links_validated": {
    "total_links": 6,
    "broken_links": 0,
    "links_checked": [
      {
        "link_text": "Responsibility Analysis",
        "target": "./responsibility-analysis.md",
        "exists": true
      },
      {
        "link_text": "Analysis Guide",
        "target": "analysis-guide/index.md",
        "exists": true
      },
      {
        "link_text": "Complexity Metrics",
        "target": "analysis-guide/complexity-metrics.md",
        "exists": true
      },
      {
        "link_text": "Scoring Strategies",
        "target": "./scoring-strategies.md",
        "exists": true
      },
      {
        "link_text": "God Object Detection",
        "target": "./god-object-detection.md",
        "exists": true
      },
      {
        "link_text": "Configuration",
        "target": "./configuration.md",
        "exists": true
      }
    ]
  },
  "feature_coverage": {
    "documented_features": [
      "AST-based pipeline detection",
      "Pure function detection",
      "Side effect classification (Pure, Benign, Impure)",
      "Composition quality scoring",
      "Purity metrics (has_mutable_state, has_side_effects, immutability_ratio, is_const_fn, side_effect_kind, purity_score)",
      "Three configuration profiles (strict, balanced, lenient)",
      "Pipeline stage types (Iterator, Map, Filter, Fold, FlatMap, Inspect, AndThen, MapErr)",
      "Terminal operations (Collect, Sum, Count, Any, All, Find, Reduce, ForEach)",
      "Parallel pipeline detection (par_iter)",
      "Nested pipeline detection",
      "Builder pattern filtering",
      "Integration with god object detection via weight multipliers",
      "Integration with risk scoring and multi-signal aggregation"
    ],
    "implemented_features": [
      "FunctionalAnalysisConfig with strict(), balanced(), lenient() profiles",
      "PipelineStage enum with all documented variants",
      "TerminalOp enum with all documented variants",
      "Pipeline struct with depth, is_parallel, nesting_level, builder_pattern fields",
      "SideEffectKind enum (Pure, Benign, Impure)",
      "PurityMetrics struct with all documented fields",
      "CompositionMetrics struct with pipelines, purity_score, immutability_ratio, composition_quality",
      "analyze_composition() entry point function",
      "detect_pipelines() with method classification",
      "analyze_purity() with purity analysis",
      "score_composition() with quality scoring",
      "PurityLevel in purity_analyzer.rs with weight_multiplier()"
    ],
    "coverage_percentage": 100
  },
  "previous_issues_resolved": [
    {
      "issue": "Broken cross-reference links in Related Chapters section",
      "resolution": "All links now point to valid chapter files (analysis-guide/index.md, analysis-guide/complexity-metrics.md, scoring-strategies.md, god-object-detection.md, configuration.md)"
    },
    {
      "issue": "References to non-existent modules (unified_analysis.rs, multi_signal_aggregation.rs)",
      "resolution": "Both modules now exist at src/builders/unified_analysis.rs and src/analysis/multi_signal_aggregation.rs"
    }
  ],
  "metadata": {
    "analyzed_at": "2025-12-27T16:30:00Z",
    "feature_inventory": ".prodigy/book-analysis/features.json",
    "topics_covered": [
      "AST-based functional analysis",
      "Pure function detection",
      "Side effect detection",
      "Composition pattern recognition",
      "Purity profiles (strict, balanced, lenient)",
      "Scoring and distribution analysis"
    ],
    "validation_focus": "Check that functional composition analysis features are documented"
  }
}
