Add comprehensive source comments to PHP and JavaScript files

[Copilot]

This PR adds extensive inline documentation and source comments to all major PHP and JavaScript files in the Redis Queue plugin, significantly improving code maintainability and developer experience.

Changes Overview

Added 896+ lines of comprehensive documentation across 10 core files:

Documentation Added

Core Plugin Files

• redis-queue.php: Documented all global functions including option migration, plugin initialization helpers, and job processing utilities
• assets/admin.js: Full JSDoc-style comments for the entire admin interface, covering dashboard operations, job management, AJAX handlers, and UI feedback mechanisms

Core Classes

• Redis_Queue.php: Singleton pattern, WordPress hooks integration, database table creation, plugin activation/deactivation, and job enqueueing
• Job_Processor.php: Job execution lifecycle, error handling, retry logic, performance tracking, and batch processing
• Redis_Queue_Manager.php: Redis connection management (native extension + Predis fallback), job storage, and connection verification

Job System

• Abstract_Base_Job.php: Base job functionality, configurable retry logic with exponential backoff, failure handling, and job lifecycle management
• Email_Job.php: Comprehensive documentation for single emails, bulk sending, newsletter distribution with personalization, and email-specific retry logic
• Sync_Worker.php: Synchronous job processing, worker state management, and statistics tracking

Contracts

• Queue_Job.php: Complete interface contract for queue jobs with serialization requirements
• Job_Result.php: Result interface contract with success/failure tracking and performance metrics

Documentation Style

All comments follow industry best practices:

PHP (PHPDoc format):

/**
 * Process queued jobs synchronously.
 *
 * Creates a synchronous worker and processes jobs from the specified queue(s).
 * This can be called from WP-CLI, cron jobs, or custom worker scripts.
 *
 * @param string|array $queue    Queue name(s) to process. Default 'default'.
 * @param int|null     $max_jobs Maximum number of jobs to process.
 * @return array|false Processing results array or false on failure.
 */

JavaScript (JSDoc style):

/**
 * Trigger the worker to process queued jobs.
 * Sends AJAX request to process jobs and displays results.
 * 
 * @param {Event} e Click event
 */

Benefits

• Improved Developer Experience: New contributors can understand code functionality without diving deep into implementation
• Better IDE Support: Proper type hints and parameter documentation enable better autocomplete and inline help
• Easier Maintenance: Complex logic is now explained with inline comments at decision points
• WordPress Standards Compliance: All documentation follows WordPress coding standards

What's Documented

✅ File-level docblocks explaining purpose and architecture
✅ Method/function docblocks with complete parameter and return type information
✅ Inline comments for complex logic, error handling, and performance considerations
✅ Interface documentation clarifying contracts and requirements
✅ Factory methods and static helpers
✅ Error handling strategies and retry logic

This documentation makes the codebase significantly more accessible for developers extending the plugin with custom job types or integrating it into their WordPress applications.

Original prompt

Add source comments to *.php and *.js

The user has attached the following files from their workspace:

• redis-queue.php

[Chronological Review: The conversation began with the user reporting an error related to a missing class in the Redis Queue plugin. This was followed by inquiries about job submission feedback in the WordPress admin interface, specifically regarding JavaScript functionality. The user then requested UI changes, such as fading buttons instead of using a spinner, and maintaining color consistency during processing. The conversation progressed to updating changelogs while keeping the version the same, refactoring the README file, adding links to documentation, and finally, adding source comments to PHP and JavaScript files.]

[Intent Mapping:

1. "Uncaught Error: Class 'Soderlind\RedisQueue\Core\Redis_Queue' not found" - User seeks to resolve a class not found error.
2. "submitting a test job, in wp admin->redis queu->test jobs, doesn't indicate that the job is submitted." - User wants to verify JavaScript functionality for job submission feedback.
3. "No spinner (don't need it), have the button fade in and out, inverting the color." - User requests a UI change for job submission feedback.
4. "keep colors the same, just fade to 'Processing ...' and back again." - User specifies a color consistency requirement during processing.
5. "keep version 2.0.0, update changelogs (CHANGELOG.md and in readme.txt)." - User wants to maintain the current version while updating documentation.
6. "refactor docs/README.md." - User requests improvements to the README documentation.
7. "in docs/README.md, when pointing to the other docs/*.md files, add a link." - User wants to enhance documentation with links.
8. "Add source comments to *.php and *.js." - User requests comments for better code documentation.]

[Technical Inventory:

• Technologies: PHP, JavaScript, WordPress Plugin Development
• Files Mentioned:
  • /Users/persoderlind/Sites/plugins/app/public/wp-content/plugins/redis-queue/redis-queue.php
  • /Users/persoderlind/Sites/plugins/app/public/wp-content/plugins/redis-queue/CHANGELOG.md
  • /Users/persoderlind/Sites/plugins/app/public/wp-content/plugins/redis-queue/readme.txt
  • /Users/persoderlind/Sites/plugins/app/public/wp-content/plugins/redis-queue/src/Admin/Admin_Interface.php
  • /Users/persoderlind/Sites/plugins/app/public/wp-content/plugins/redis-queue/src/Admin/partials/test-inline.php
  • /Users/persoderlind/Sites/plugins/app/public/wp-content/plugins/redis-queue/assets/admin.js
  • /Users/persoderlind/Sites/plugins/app/public/wp-content/plugins/redis-queue/assets/admin.css
  • /Users/persoderlind/Sites/plugins/app/public/wp-content/plugins/redis-queue/docs/README.md]

[Code Archaeology:

• The user has made edits to several files, including the main plugin file, changelogs, and documentation files. Specific functions or classes were not detailed in the conversation but are implied to be part of the plugin's functionality.]

[Progress Assessment:

• Completed Tasks: User has identified and reported an error, requested UI changes, and specified documentation updates.
• Partially Complete Work: Ongoing updates to documentation and code comments are pending.]

[Context Validation: All critical information for continuation is captured, including user requests for error resolution, UI changes, and documentation updates.]

[Recent Commands Analysis:

• Last Agent Commands: User requests to add source comments to *.php and *.js files.
• Tool Results Summary: No specific tool results were provided in the recent commands, but the user has indicated ongoing work on documentation and UI improvements.
• Pre-Summary State: The agent was actively discussing documentation and code comments when the token budget was exceeded.
• Operation Context: These commands relate to the user's goal of improving the plugin's usability and maintainability through better documentation and UI feedback.]

1. Conversation Overview: - Primary Objectives: - "Uncaught Error: Class 'Soderlind\RedisQueue\Core\Redis_Queue' not found" - Resolve class error. - "submitting a test job, in wp admin->redis queu->test jobs, doesn't indicate that the job is submitted." - Verify job submission feedback. - "No spinner (don't need it), have the button fade in and out, inverting the color." - Request UI changes. - "keep version 2.0.0, update changelogs (CHANGELOG.md and in readme.txt)." - Update documentation while maintaining version. - "refactor docs/README.md." - Improve README documentation. - "Add source comments to *.php and *.js." - Enhance code documentation. - Session Context: The conversation has focused on error resolution, UI improvements, and documentation updates for the Redis Queue plugin. - User Intent Evolution: The user has shifted from error reporting to enhancing user experience and documentation quality.

2. Technical Foundation:

• PHP: Used for the plugin developm...

Created from VS Code via the GitHub Pull Request extension.

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