admin:
  Purpose: Validates admin tokens via URL; cleans expired tokens; redirects on success.
  "Lifecycle Role": Routing middleware plus GET handler for /admin/:token.
  Dependencies:
    Upstream:
      - ../utils/adminToken
      - ../utils/HttpError
    Downstream:
      - index
  "Data Flow":
    Inputs: URL param token, HTTP headers (Referer, host).
    Outputs: HTTP 301 redirect or pass to next middleware.
    "Side Effects": Probabilistic token cleanup.
  "Performance and Scalability":
    Bottlenecks:
      - Token Validation logic errors.
      - CleanupTokens impact with large token store.
    Concurrency: Potential Concurrency concerns in token cleanup.
  "Security and Stability":
    Validation: Token validated via utility; referrer used for redirect.
    Vulnerabilities:
      - Silent failure on invalid tokens.
      - Possible open redirect via unvalidated referrer.
  "Architecture Assessment":
    Coupling: Moderate; depends on token utilities.
    Abstraction: Combines middleware and route logic.
    Recommendations:
      - Schedule token cleanup in background job.
      - Make token Validation failures explicit.
      - Sanitize redirect referrer.
      - Optimize token store access and caching.

analyticsPostHandler:
  Purpose: Records client analytics data into SQLite database.
  "Lifecycle Role": POST request handler for analytics events.
  Dependencies:
    Upstream:
      - ../utils/sqlite3
    Downstream: []
  "Data Flow":
    Inputs: JSON analytics data, client IP addresses.
    Outputs: Database insert; HTTP 204 response.
    "Side Effects": Writes to analytics SQLite table.
  "Performance and Scalability":
    Bottlenecks:
      - SQLite write performance under high traffic.
      - No rate limiting or throttling.
    Concurrency: SQLite may serialize writes; Concurrency limited.
  "Security and Stability":
    Validation: No explicit input Validation visible.
    Vulnerabilities:
      - Potential injection if SQL not parameterized.
      - No authentication or rate limiting allows abuse.
  "Architecture Assessment":
    Coupling: Low; depends on DB utility only.
    Abstraction: Simple handler with direct DB writes.
    Recommendations:
      - Implement input Validation and sanitization.
      - Use async queue or batch writes.
      - Add rate limiting.
      - Migrate to scalable DB if traffic grows.

blogIndex:
  Purpose: Serves blog index by reading, filtering, sorting posts from filesystem.
  "Lifecycle Role": GET handler for /blog route.
  Dependencies:
    Upstream:
      - ../utils/postFileUtils (getAllPosts)
    Downstream:
      - index
  "Data Flow":
    Inputs: Query param drafts (optional).
    Outputs: Rendered HTML page with posts excerpts.
    "Side Effects": Reads filesystem synchronously or asynchronously.
  "Performance and Scalability":
    Bottlenecks:
      - Filesystem read latency on large post counts.
      - No caching; blocking IO possible.
    Concurrency: None noted.
  "Security and Stability":
    Validation: Query param drafts validated for filtering.
    Vulnerabilities:
      - Risk of exposing unpublished posts if misconfigured.
  "Architecture Assessment":
    Coupling: Moderate; depends on postFileUtils.
    Abstraction: Content rendering with direct file access.
    Recommendations:
      - Cache posts in memory or external cache.
      - Pre-render static index pages.
      - Add pagination.
      - Strictly validate drafts param.

contact:
  Purpose: Handles contact form with GET and POST; validates, verifies CAPTCHA, analyzes threats, sends email.
  "Lifecycle Role": Routes for /contact and /contact/thankyou.
  Dependencies:
    Upstream:
      - sendContactMail
      - formLimiter
      - verifyHCaptcha
      - HttpError
      - captureSecurityData
      - analyzeThreatLevel
      - logSecurityEvent
      - qualifyLink
    Downstream:
      - index
  "Data Flow":
    Inputs: Form submission data, CAPTCHA token.
    Outputs: Redirect or error response.
    "Side Effects":
      - Sends email.
      - Creates security logs.
      - Potentially blocks requests on high threat.
  "Performance and Scalability":
    Bottlenecks:
      - CAPTCHA service latency.
      - Email server delays.
      - Async threat analysis overhead.
    Concurrency: None specified.
  "Security and Stability":
    Validation: Extensive input Validation and CAPTCHA verification.
    Vulnerabilities:
      - Potential false positives blocking legitimate users.
      - Dependency on external CAPTCHA and mail service availability.
  "Architecture Assessment":
    Coupling: High; integrates multiple utilities tightly.
    Abstraction: Mixed Validation, security, and communication logic.
    Recommendations:
      - Refactor security logic into middleware.
      - Add retry/circuit breaker for CAPTCHA and mail.
      - Monitor threat thresholds and tune.
      - Cache CAPTCHA Validation if possible.

errorPage:
  Purpose: Generates error page views for HTTP status codes.
  "Lifecycle Role": Error handler middleware or route.
  Dependencies:
    Upstream:
      - getErrorContext
    Downstream:
      - index
  "Data Flow":
    Inputs: HTTP error code param.
    Outputs: Rendered error page HTML.
    "Side Effects": None.
  "Performance and Scalability":
    Bottlenecks: None.
    Concurrency: None.
  "Security and Stability":
    Validation: Error code validated; fallback to 500 on invalid.
    Vulnerabilities: None.
  "Architecture Assessment":
    Coupling: Low; depends on error context util.
    Abstraction: Simple rendering module.
    Recommendations:
      - Add localization support.
      - Support custom error pages per route.
      - Ensure robust fallback for missing context.
index:
  Purpose: Aggregates all route modules; mounts middleware and routes; handles favicon; includes root (/) route rendering home page with recent blog posts.
  "Lifecycle Role": Main route aggregator in Express app lifecycle; first route executed on base URL GET requests.
  Dependencies:
    Upstream:
      - about
      - admin
      - analyticsPostHandler (unnamed)
      - blogIndex
      - contact
      - errorPage
      - csrfMiddleware
      - securedRoutesMiddleware
      - getAllPosts utility
    Downstream: []
  "Data Flow":
    Inputs: Incoming HTTP requests, including GET / at root
    Outputs: Route-specific responses; rendered home page HTML with filtered, sorted posts on GET /
    "Side Effects": Middleware and route execution; file I/O on each root request
  "Performance and Scalability":
    Bottlenecks:
      - Potential bloat and monolithic routing complexity
      - Disk latency and large number of posts when rendering home page
    Concurrency: None
  "Security and Stability":
    Validation: Depends on imported middleware; filters out drafts before rendering home page
    Vulnerabilities:
      - Risk of misconfiguration breaking routing
      - Potential draft exposure if filtering fails
  "Architecture Assessment":
    Coupling: High; central point integrating all routes and utilities
    Abstraction: Monolithic route setup including presentation layer for home page data
    Recommendations:
      - Modularize routing by feature domain
      - Consider lazy loading routes if feasible
      - Implement caching for posts to reduce disk I/O
      - Harden draft filtering to prevent data leaks

rssFeed:
  Purpose: Provides JSON API endpoint for RSS feed data.
  "Lifecycle Role": Responds to /rss-feed.xml GET requests serving JSON payload.
  Dependencies:
    Upstream:
      - getAllPodcastEpisodes utility
    Downstream: []
  "Data Flow":
    Inputs: GET request at /rss-feed.xml
    Outputs: JSON with rss-feed metadata and episodes
    "Side Effects": None
  "Performance and Scalability":
    Bottlenecks:
      - File read errors
      - Large data payloads
    Concurrency: None
  "Security and Stability":
    Validation: Validates data before JSON serialization
    Vulnerabilities:
      - Exposure to large payload denial-of-service
      - Possible malformed data if upstream fails
  "Architecture Assessment":
    Coupling: Depends on getAllPodcastEpisodes; minimal downstream coupling
    Abstraction: API layer exposing rss-feed data
    Recommendations:
      - Add rate limiting for payload requests
      - Validate and sanitize data from source

privacy:
  Purpose: Serves privacy policy page via template rendering.
  "Lifecycle Role": Responds to /privacy GET requests.
  Dependencies:
    Upstream: []
    Downstream:
      - main router
  "Data Flow":
    Inputs: GET request at /privacy
    Outputs: Rendered HTML privacy policy page
    "Side Effects": None
  "Performance and Scalability":
    Bottlenecks: None
    Concurrency: None
  "Security and Stability":
    Validation: None required; static content
    Vulnerabilities: None
  "Architecture Assessment":
    Coupling: Minimal coupling; static content delivery
    Abstraction: Static page rendering
    Recommendations: None

robots:
  Purpose: Serves robots.txt file for web crawlers.
  "Lifecycle Role": Handles GET /robots.txt requests.
  Dependencies:
    Upstream: []
    Downstream:
      - main router
  "Data Flow":
    Inputs: GET request at /robots.txt
    Outputs: Static text response with robots.txt content
    "Side Effects": None
  "Performance and Scalability":
    Bottlenecks: None
    Concurrency: None
  "Security and Stability":
    Validation: None
    Vulnerabilities: None
  "Architecture Assessment":
    Coupling: Minimal; static content
    Abstraction: Static file serving
    Recommendations: None

thanks:
  Purpose: Renders thank you page, typically post-contact form submission.
  "Lifecycle Role": Handles GET /thanks requests.
  Dependencies:
    Upstream: []
    Downstream:
      - main router
  "Data Flow":
    Inputs: GET request at /thanks
    Outputs: Rendered thank you HTML page
    "Side Effects": None
  "Performance and Scalability":
    Bottlenecks: None
    Concurrency: None
  "Security and Stability":
    Validation: None
    Vulnerabilities: None
  "Architecture Assessment":
    Coupling: Minimal; static rendering
    Abstraction: Static page rendering
    Recommendations: None

adminToken:
  Purpose: Manages admin tokens including Validation, expiration checks, cleanup.
  "Lifecycle Role": Used by admin routes and middleware in src/routes/admin.js.
  Dependencies:
    Upstream: []
    Downstream:
      - src/routes/admin.js
  "Data Flow":
    Inputs: Token strings
    Outputs:
      - Boolean or user data for valid tokens
    "Side Effects":
      - Removes expired tokens from storage
  "Performance and Scalability":
    Bottlenecks: Token storage access latency
    Concurrency: Token Validation Concurrency concerns if storage is not thread-safe
  "Security and Stability":
    Validation: Checks token validity and expiration
    Vulnerabilities:
      - Token replay attacks if tokens are not rotated or invalidated properly
      - Possible token storage compromise
  "Architecture Assessment":
    Coupling: Tightly coupled with admin routes
    Abstraction: Token management layer abstracted from route logic
    Recommendations:
      - Implement secure token storage with encryption
      - Enforce token rotation and revocation policies
      - Ensure Concurrency-safe token cleanup
"Cross Cutting Summary":
  Themes:
    - Most modules serve as HTTP route handlers with minimal state or side effects.
    - Static content modules have negligible security or performance concerns.
    - Modules reading from filesystem or generating dynamic content face potential I/O Bottlenecks.
    - Validation is inconsistent; dynamic data modules require stronger input sanitization and output filtering.
    - Token management critical for security; requires robust Concurrency and storage protections.
    - Caching and rate limiting absent, presenting performance and DoS risk.
    - Architectural coupling mostly loose except for token manager tightly coupled to admin routes.
    - Recommendations converge on improved caching, Validation, security hardening, and Concurrency control.

  "Common Themes":
    - Heavy reliance on synchronous or blocking IO (filesystem, SQLite).
    - Security concerns centralized in route handlers rather than middleware.
    - Lack of deterministic or background scheduling for maintenance tasks (token cleanup).
    - Insufficient input Validation and sanitization in analytics and admin modules.
    - Risk of performance Bottlenecks in DB writes and file reads without caching.
    - Coupling varies; some modules isolated, others tightly coupled with utilities.
    - Potential Vulnerabilities from silent failure modes and open redirect vectors.
  "Overall Recommendations":
    - Shift heavy logic to middleware or background jobs.
    - Implement robust input Validation and sanitization universally.
    - Use caching layers for static or infrequently changing data.
    - Schedule cleanup and maintenance outside request lifecycle.
    - Modularize and decouple routing for maintainability.
    - Add rate limiting and monitoring for analytics and critical paths.
