#!/usr/bin/env node
/**
 * Validation Layer - Post-Response Quality Gate
 * 
 * After LLM responds, validate against:
 * - Rules followed
 * - Format compliance  
 * - Workflow adherence
 * - Safety constraints
 */

class ResponseValidator {
  constructor(workflow) {
    this.workflow = workflow;
    this.errors = [];
    this.warnings = [];
  }

  /**
   * Validate a response against all checks
   */
  validate(response) {
    this.errors = [];
    this.warnings = [];

    this.checkRulesFollowed(response);
    this.checkFormatCompliance(response);
    this.checkWorkflowAdherence(response);
    this.checkSafetyConstraints(response);

    return {
      passed: this.errors.length === 0,
      errors: this.errors,
      warnings: this.warnings,
      summary: this.buildSummary()
    };
  }

  /**
   * Check 1: Rules Followed
   */
  checkRulesFollowed(response) {
    // Check for prohibited phrases
    const prohibited = [
      { pattern: /it should work/i, msg: "Assumed working without verification" },
      { pattern: /probably|maybe|likely/i, msg: "Speculative language detected" },
      { pattern: /i think/i, msg: "Unverified assumption" }
    ];

    for (const check of prohibited) {
      if (check.pattern.test(response)) {
        this.errors.push({
          category: 'rules',
          message: check.msg,
          suggestion: 'Verify before stating'
        });
      }
    }

    // Check for required phrases (workflow dependent)
    const required = this.getRequiredPhrases();
    for (const phrase of required) {
      if (!response.includes(phrase)) {
        this.warnings.push({
          category: 'rules',
          message: `Missing required element: "${phrase}"`,
          suggestion: `Add "${phrase}" to response`
        });
      }
    }
  }

  /**
   * Check 2: Format Compliance
   */
  checkFormatCompliance(response) {
    const checks = [
      { pattern: /^##\s+/m, name: 'Section headers', required: true },
      { pattern: /\|.*\|.*\|/m, name: 'Tables (optional)', required: false },
      { pattern: /^- \[x\]|^- \[ \]/m, name: 'Checkbox lists (optional)', required: false }
    ];

    for (const check of checks) {
      if (check.required && !check.pattern.test(response)) {
        this.errors.push({
          category: 'format',
          message: `Missing required format: ${check.name}`,
          suggestion: `Add ${check.name.toLowerCase()}`
        });
      }
    }
  }

  /**
   * Check 3: Workflow Adherence
   */
  checkWorkflowAdherence(response) {
    const workflowChecks = {
      'coding': [
        { pattern: /## Verification/, msg: 'Missing verification section' },
        { pattern: /## Files Modified/, msg: 'Missing files modified section' }
      ],
      'debug': [
        { pattern: /## Cause|## Root Cause/, msg: 'Missing cause/root cause' },
        { pattern: /## Fix|## Solution/, msg: 'Missing fix section' }
      ],
      'deploy': [
        { pattern: /## Pre-Deployment|## Backup/, msg: 'Missing pre-deployment/backup' },
        { pattern: /## Verification/, msg: 'Missing verification section' }
      ],
      'audit': [
        { pattern: /## Findings/, msg: 'Missing findings section' },
        { pattern: /## Recommendations/, msg: 'Missing recommendations' }
      ]
    };

    const checks = workflowChecks[this.workflow] || [];
    for (const check of checks) {
      if (!check.pattern.test(response)) {
        this.warnings.push({
          category: 'workflow',
          message: check.msg,
          suggestion: `Follow ${this.workflow} workflow format`
        });
      }
    }
  }

  /**
   * Check 4: Safety Constraints
   */
  checkSafetyConstraints(response) {
    const safetyChecks = [
      { 
        pattern: /rm -rf|dd if=|mkfs\.\w+|>\s*\/dev\/\w+/, 
        msg: 'Potentially destructive command',
        severity: 'error'
      },
      {
        pattern: /ALTER\s+TABLE\s+.*DROP|DELETE\s+FROM\s+\w+\s+WHERE/i,
        msg: 'Database destructive operation',
        severity: 'error'
      },
      {
        pattern: /chmod\s+777|chown\s+-R/i,
        msg: 'Overly permissive permissions',
        severity: 'warning'
      }
    ];

    for (const check of safetyChecks) {
      if (check.pattern.test(response)) {
        const entry = {
          category: 'safety',
          message: check.msg,
          suggestion: 'Review for safety'
        };
        
        if (check.severity === 'error') {
          this.errors.push(entry);
        } else {
          this.warnings.push(entry);
        }
      }
    }
  }

  /**
   * Get required phrases for current workflow
   */
  getRequiredPhrases() {
    const phrases = {
      'coding': ['Verification'],
      'debug': ['Cause', 'Fix'],
      'deploy': ['Backup', 'Verification'],
      'audit': ['Findings']
    };
    return phrases[this.workflow] || [];
  }

  /**
   * Build validation summary
   */
  buildSummary() {
    const parts = [];
    
    if (this.errors.length === 0 && this.warnings.length === 0) {
      parts.push('✅ All checks passed');
    } else {
      if (this.errors.length > 0) {
        parts.push(`❌ ${this.errors.length} error(s)`);
      }
      if (this.warnings.length > 0) {
        parts.push(`⚠️ ${this.warnings.length} warning(s)`);
      }
    }
    
    return parts.join(', ');
  }
}

// Export for use
module.exports = ResponseValidator;

// CLI usage
if (require.main === module) {
  const workflow = process.argv[2] || 'coding';
  const responseFile = process.argv[3];
  
  if (!responseFile) {
    console.error('Usage: node validator.js <workflow> <response-file>');
    process.exit(1);
  }

  const fs = require('fs');
  const response = fs.readFileSync(responseFile, 'utf8');
  
  const validator = new ResponseValidator(workflow);
  const result = validator.validate(response);
  
  console.log(JSON.stringify(result, null, 2));
}