# Documentation Link Validator Roadmap

**Status**: Active
**Type**: Roadmap
**Created**: 2025-10-02
**Updated**: 2025-10-02
**Sprint**: v0.6.0 - Documentation Validation
**Duration**: 3 weeks
**Priority**: P0

---

## Overview

Implementation roadmap for the documentation link validation feature in PMAT. This feature will validate all markdown links (internal and external) and fail builds on 404 errors.

**Specification**: See `docs/specifications/components/documentation.md`

## Sprint Goal

Deliver a production-ready documentation link validator integrated into PMAT CLI with:
- ✅ 80%+ test coverage
- ✅ Property-based tests
- ✅ Comprehensive doctests
- ✅ Quality gates passing
- ✅ Published to crates.io

## Tasks

### Phase 1: Core Link Extraction (Days 1-3)

| ID | Description | Status | Complexity | Priority | Tests Required |
|----|-------------|--------|------------|----------|----------------|
| PMAT-1001 | Implement regex-based markdown link parser | 📋 | Medium | P0 | Property tests, unit tests |
| PMAT-1002 | Add link classification (Internal/HTTP/Anchor/Email) | 📋 | Low | P0 | Property tests, unit tests |
| PMAT-1003 | Extract line numbers for error reporting | 📋 | Low | P0 | Unit tests |
| PMAT-1004 | Handle malformed markdown link syntax | 📋 | Medium | P0 | Property tests, edge case tests |
| PMAT-1005 | Add doctests for link extraction functions | 📋 | Low | P0 | Doctests |

**Definition of Done**:
- [ ] All link extraction tests passing
- [ ] Property tests verify completeness
- [ ] Doctests demonstrate usage
- [ ] Code coverage ≥ 80% for extraction module
- [ ] `cargo clippy` passes

**Estimated Effort**: 2-3 days

---

### Phase 2: Internal Link Validation (Days 4-5)

| ID | Description | Status | Complexity | Priority | Tests Required |
|----|-------------|--------|------------|----------|----------------|
| PMAT-1006 | Implement file existence checking for internal links | 📋 | Low | P0 | Unit tests, integration tests |
| PMAT-1007 | Add relative path resolution from source file | 📋 | Medium | P0 | Property tests, unit tests |
| PMAT-1008 | Handle path normalization (../, ./, etc.) | 📋 | Medium | P0 | Property tests, edge cases |
| PMAT-1009 | Validate anchor links within documents | 📋 | High | P1 | Unit tests |
| PMAT-1010 | Add support for case-insensitive filesystems | 📋 | Low | P1 | Unit tests |

**Definition of Done**:
- [ ] All internal link tests passing
- [ ] Handles relative and absolute paths
- [ ] Property tests verify path resolution
- [ ] Integration tests with real files
- [ ] Code coverage ≥ 80%

**Estimated Effort**: 2 days

---

### Phase 3: HTTP Link Validation (Days 6-9)

| ID | Description | Status | Complexity | Priority | Tests Required |
|----|-------------|--------|------------|----------|----------------|
| PMAT-1011 | Set up reqwest HTTP client with timeout | 📋 | Low | P0 | Unit tests |
| PMAT-1012 | Implement HTTP HEAD request validation | 📋 | Medium | P0 | Integration tests with mock server |
| PMAT-1013 | Add retry logic with exponential backoff | 📋 | High | P0 | Property tests, unit tests |
| PMAT-1014 | Implement concurrent HTTP request handling | 📋 | High | P0 | Integration tests, benchmarks |
| PMAT-1015 | Add connection pooling and keep-alive | 📋 | Medium | P1 | Performance tests |
| PMAT-1016 | Handle HTTP redirects (301, 302, 307, 308) | 📋 | Medium | P0 | Unit tests |
| PMAT-1017 | Detect and report 404 errors | 📋 | Low | P0 | Unit tests |
| PMAT-1018 | Handle network errors gracefully | 📋 | Medium | P0 | Unit tests |
| PMAT-1019 | Add user-agent and custom headers support | 📋 | Low | P1 | Unit tests |

**Definition of Done**:
- [ ] HTTP validation working for 2xx, 3xx, 4xx, 5xx
- [ ] Retry logic tested with property tests
- [ ] Concurrent requests tested with 100+ links
- [ ] Mock HTTP server tests passing
- [ ] Code coverage ≥ 80%
- [ ] Performance benchmarks documented

**Estimated Effort**: 3-4 days

---

### Phase 4: CLI Integration (Days 10-12)

| ID | Description | Status | Complexity | Priority | Tests Required |
|----|-------------|--------|------------|----------|----------------|
| PMAT-1020 | Add `validate-docs` subcommand to PMAT CLI | 📋 | Low | P0 | Integration tests |
| PMAT-1021 | Implement command-line argument parsing | 📋 | Low | P0 | Unit tests |
| PMAT-1022 | Add text output formatter | 📋 | Low | P0 | Unit tests |
| PMAT-1023 | Add JSON output formatter | 📋 | Medium | P0 | Unit tests |
| PMAT-1024 | Add JUnit XML output formatter for CI | 📋 | Medium | P1 | Unit tests |
| PMAT-1025 | Implement configuration file support (.toml) | 📋 | Medium | P0 | Integration tests |
| PMAT-1026 | Add exclude patterns (glob support) | 📋 | Medium | P0 | Property tests, unit tests |
| PMAT-1027 | Add progress indicator for long validations | 📋 | Low | P1 | Manual testing |
| PMAT-1028 | Exit with error code on broken links | 📋 | Low | P0 | Integration tests |

**Definition of Done**:
- [ ] CLI command functional end-to-end
- [ ] All output formatters working
- [ ] Configuration file parsing tested
- [ ] Integration tests with real CLI invocation
- [ ] Code coverage ≥ 80%
- [ ] Documentation complete

**Estimated Effort**: 2-3 days

---

### Phase 5: Quality & Performance (Days 13-16)

| ID | Description | Status | Complexity | Priority | Tests Required |
|----|-------------|--------|------------|----------|----------------|
| PMAT-1029 | Run all property tests and verify coverage | 📋 | Low | P0 | Property tests |
| PMAT-1030 | Run all unit tests and integration tests | 📋 | Low | P0 | All tests |
| PMAT-1031 | Run all doctests | 📋 | Low | P0 | Doctests |
| PMAT-1032 | Run `pmat quality-gate` and fix violations | 📋 | Medium | P0 | Quality gates |
| PMAT-1033 | Run `cargo llvm-cov` and achieve 80%+ coverage | 📋 | Medium | P0 | Coverage analysis |
| PMAT-1034 | Add benchmark suite with criterion | 📋 | Medium | P1 | Benchmarks |
| PMAT-1035 | Profile and optimize hot paths | 📋 | High | P1 | Profiling |
| PMAT-1036 | Run clippy and fix all warnings | 📋 | Low | P0 | Linting |
| PMAT-1037 | Run rustfmt on all code | 📋 | Low | P0 | Formatting |
| PMAT-1038 | Update documentation and examples | 📋 | Medium | P0 | Documentation review |

**Definition of Done**:
- [ ] All tests passing (100% pass rate)
- [ ] Test coverage ≥ 80%
- [ ] Quality gates passing
- [ ] No clippy warnings
- [ ] Code formatted with rustfmt
- [ ] Benchmarks documented
- [ ] Performance requirements met

**Estimated Effort**: 3-4 days

---

### Phase 6: Release (Days 17-18)

| ID | Description | Status | Complexity | Priority | Tests Required |
|----|-------------|--------|------------|----------|----------------|
| PMAT-1039 | Bump version to 0.6.0 in Cargo.toml | 📋 | Low | P0 | N/A |
| PMAT-1040 | Update CHANGELOG.md with release notes | 📋 | Low | P0 | N/A |
| PMAT-1041 | Update README.md with validate-docs usage | 📋 | Low | P0 | N/A |
| PMAT-1042 | Run final quality checks before release | 📋 | Low | P0 | All checks |
| PMAT-1043 | Create git tag for v0.6.0 | 📋 | Low | P0 | N/A |
| PMAT-1044 | Publish to crates.io with `cargo publish` | 📋 | Low | P0 | Publish verification |
| PMAT-1045 | Create GitHub release with notes | 📋 | Low | P0 | N/A |
| PMAT-1046 | Push commits and tags to GitHub | 📋 | Low | P0 | N/A |
| PMAT-1047 | Verify crates.io publication | 📋 | Low | P0 | Download test |
| PMAT-1048 | Announce release (Discord/Twitter/Docs) | 📋 | Low | P2 | N/A |

**Definition of Done**:
- [ ] Version bumped and committed
- [ ] CHANGELOG.md updated
- [ ] Published to crates.io successfully
- [ ] GitHub release created with artifacts
- [ ] All commits pushed to master
- [ ] Verification tests passing

**Estimated Effort**: 1-2 days

---

## Quality Gates

All phases must pass:

### Automated Quality Checks
```bash
# Run all tests
cargo test --all-features

# Run doctests
cargo test --doc

# Run property tests
cargo test --test proptest

# Run clippy
cargo clippy --all-targets --all-features -- -D warnings

# Check formatting
cargo fmt -- --check

# Run PMAT quality gate
pmat quality-gate

# Generate coverage report
cargo llvm-cov --all-features --lcov --output-path lcov.info
cargo llvm-cov report

# Run benchmarks
cargo bench
```

### Coverage Requirements
- **Minimum**: 80% line coverage
- **Target**: 90% line coverage
- **Critical paths**: 100% coverage (link extraction, validation)

### Performance Requirements
- **Throughput**: ≥ 1000 links/minute
- **Concurrency**: 10-50 concurrent HTTP requests
- **Memory**: ≤ 100MB for 10,000 links
- **Latency**: ≤ 30s default HTTP timeout

## Dependencies

### Production Dependencies
```toml
tokio = { version = "1", features = ["full"] }
reqwest = { version = "0.11", features = ["json"] }
regex = "1.10"
walkdir = "2.4"
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
anyhow = "1.0"
thiserror = "1.0"
clap = { version = "4.5", features = ["derive"] }
```

### Development Dependencies
```toml
proptest = "1.4"
tempfile = "3.8"
mockito = "1.2"
criterion = "0.5"
tokio-test = "0.4"
```

## Risk Mitigation

### Technical Risks

| Risk | Probability | Impact | Mitigation |
|------|------------|--------|------------|
| HTTP rate limiting | Medium | Medium | Add configurable delays, respect robots.txt |
| Flaky HTTP tests | High | Low | Use mock HTTP servers (mockito) |
| Performance bottlenecks | Medium | Medium | Benchmark early, optimize hot paths |
| External link timeouts | High | Low | Configurable timeouts, retry logic |
| Test coverage gaps | Low | High | Property tests, continuous monitoring |

### Schedule Risks

| Risk | Probability | Impact | Mitigation |
|------|------------|--------|------------|
| HTTP validation complexity | Medium | Medium | Allocate extra time to Phase 3 |
| Quality gate failures | Low | High | Daily quality checks throughout |
| Integration issues | Low | Medium | Integration tests from Phase 1 |

## Success Metrics

- [ ] **Functionality**: All 48 tasks completed
- [ ] **Quality**: 80%+ test coverage achieved
- [ ] **Testing**: All property tests, unit tests, integration tests passing
- [ ] **Performance**: Benchmarks meet requirements
- [ ] **Documentation**: Complete with examples and doctests
- [ ] **Release**: Published to crates.io and GitHub
- [ ] **Adoption**: Feature documented in main README

## Communication Plan

### Daily Standups
- Review completed tasks
- Identify blockers
- Update task status

### Weekly Reviews
- Demo working features
- Review quality metrics
- Adjust timeline if needed

### Release Announcement
- CHANGELOG.md with detailed notes
- GitHub release with examples
- Documentation site update
- Community notification

## Timeline Summary

| Phase | Duration | Days | Deliverable |
|-------|----------|------|-------------|
| Phase 1: Core Link Extraction | 2-3 days | 1-3 | Link parsing with tests |
| Phase 2: Internal Link Validation | 2 days | 4-5 | File validation working |
| Phase 3: HTTP Link Validation | 3-4 days | 6-9 | HTTP checks with retry |
| Phase 4: CLI Integration | 2-3 days | 10-12 | Working CLI command |
| Phase 5: Quality & Performance | 3-4 days | 13-16 | All quality gates passing |
| Phase 6: Release | 1-2 days | 17-18 | Published release |
| **Total** | **13-18 days** | **~3 weeks** | **Production release** |

---

**Next Steps**:
1. Create GitHub issues for all tasks (PMAT-1001 through PMAT-1048)
2. Begin Phase 1 with RED tests
3. Daily progress tracking in this document
4. Weekly quality gate checks

**Related Documents**:
- Specification: `docs/specifications/components/documentation.md`
- GitHub Project: TBD
- Coverage Reports: `target/llvm-cov/html/index.html`
