#!/usr/bin/env node

/**
 * Credential & Attribution Validator
 *
 * Prevents unauthorized changes to:
 * - Copyright attribution
 * - GitHub repository URLs
 * - Contact emails
 * - Domain names
 * - API keys/credentials
 * - Legal entity names
 *
 * Architectural enforcement to prevent Claude from arbitrarily changing
 * important credentials without human confirmation.
 *
 * Created: 2025-10-18
 * Incident: Footer component overwrote copyright from "John G Stroh" to "Tractatus AI Safety Framework"
 */

const fs = require('fs');
const path = require('path');

// IMMUTABLE CREDENTIALS - These values MUST NOT be changed without human approval
const PROTECTED_VALUES = {
  copyright_holder: 'John G Stroh',
  github_org: 'AgenticGovernance',
  github_repo: 'tractatus-framework',
  primary_email: 'hello@agenticgovernance.digital',
  support_email: 'support@agenticgovernance.digital',
  domain: 'agenticgovernance.digital',
  license: 'Apache License 2.0',
};

// File patterns that commonly contain credentials
const CREDENTIAL_FILES = [
  'public/js/components/footer.js',
  'LICENSE',
  'package.json',
  'public/**/*.html',
  'docs/**/*.md',
];

/**
 * Validate that protected values haven't been arbitrarily changed
 */
function validateCredentials(filePath, fileContent) {
  const violations = [];

  // Check for incorrect copyright attribution
  const copyrightRegex = /©.*?(\d{4})\s+([^.\n<]+)/g;
  let match;
  while ((match = copyrightRegex.exec(fileContent)) !== null) {
    const holder = match[2].trim();

    // Allow "John G Stroh" or "John G. Stroh" (with period)
    if (!holder.includes('John G') && !holder.includes(PROTECTED_VALUES.copyright_holder)) {
      violations.push({
        type: 'COPYRIGHT_MISMATCH',
        line: getLineNumber(fileContent, match.index),
        found: holder,
        expected: PROTECTED_VALUES.copyright_holder,
        message: `Copyright holder must be "${PROTECTED_VALUES.copyright_holder}" (from LICENSE file)`
      });
    }
  }

  // Check for incorrect GitHub URLs
  const githubRegex = /github\.com\/([^\/\s"']+)\/([^\/\s"'<]+)/g;
  while ((match = githubRegex.exec(fileContent)) !== null) {
    const org = match[1];
    const repo = match[2];

    // Check if it's supposed to be our repo but has wrong values
    if ((org !== PROTECTED_VALUES.github_org || repo !== PROTECTED_VALUES.github_repo) &&
        (org.includes('tractatus') || repo.includes('tractatus'))) {
      violations.push({
        type: 'GITHUB_URL_INCORRECT',
        line: getLineNumber(fileContent, match.index),
        found: `${org}/${repo}`,
        expected: `${PROTECTED_VALUES.github_org}/${PROTECTED_VALUES.github_repo}`,
        message: `GitHub repository must be "${PROTECTED_VALUES.github_org}/${PROTECTED_VALUES.github_repo}"`
      });
    }
  }

  // Check for placeholder GitHub URLs
  if (fileContent.includes('github.com/yourusername') ||
      fileContent.includes('github.com/your-org')) {
    violations.push({
      type: 'GITHUB_PLACEHOLDER',
      message: 'GitHub URL contains placeholder - must use actual repository URL',
      expected: `https://github.com/${PROTECTED_VALUES.github_org}/${PROTECTED_VALUES.github_repo}`
    });
  }

  // Check for incorrect domain references
  const domainRegex = /https?:\/\/([a-z0-9-]+\.)+[a-z]{2,}/gi;
  while ((match = domainRegex.exec(fileContent)) !== null) {
    const url = match[0];
    // Skip CDNs, external services, etc.
    if (url.includes('tractatus') && !url.includes(PROTECTED_VALUES.domain)) {
      violations.push({
        type: 'DOMAIN_INCORRECT',
        line: getLineNumber(fileContent, match.index),
        found: url,
        expected: `https://${PROTECTED_VALUES.domain}`,
        message: `Domain must be "${PROTECTED_VALUES.domain}"`
      });
    }
  }

  return violations;
}

/**
 * Get line number from character index
 */
function getLineNumber(content, index) {
  return content.substring(0, index).split('\n').length;
}

/**
 * Main validation function
 */
function validate(filePath, operation) {
  // Only validate files that might contain credentials
  const shouldValidate = CREDENTIAL_FILES.some(pattern => {
    if (pattern.includes('*')) {
      const regex = new RegExp(pattern.replace(/\*/g, '.*'));
      return regex.test(filePath);
    }
    return filePath.includes(pattern);
  });

  if (!shouldValidate) {
    return { valid: true };
  }

  // Read file content
  let content;
  try {
    content = fs.readFileSync(filePath, 'utf-8');
  } catch (error) {
    // File doesn't exist yet (being created)
    return { valid: true };
  }

  // Validate credentials
  const violations = validateCredentials(filePath, content);

  if (violations.length > 0) {
    return {
      valid: false,
      violations,
      message: formatViolations(filePath, violations)
    };
  }

  return { valid: true };
}

/**
 * Format violations for human-readable output
 */
function formatViolations(filePath, violations) {
  let message = `\n❌ CREDENTIAL VIOLATION in ${filePath}\n\n`;
  message += `PROTECTED CREDENTIALS ENFORCEMENT:\n`;
  message += `The following values are IMMUTABLE and require human approval to change:\n\n`;

  for (const violation of violations) {
    message += `  ⚠️  ${violation.type}:\n`;
    if (violation.line) {
      message += `      Line: ${violation.line}\n`;
    }
    if (violation.found) {
      message += `      Found: "${violation.found}"\n`;
    }
    message += `      Expected: "${violation.expected}"\n`;
    message += `      Reason: ${violation.message}\n\n`;
  }

  message += `\n`;
  message += `RESOLUTION:\n`;
  message += `1. This change requires EXPLICIT human approval\n`;
  message += `2. Verify the change is intentional and authorized\n`;
  message += `3. If correcting an error, update to the protected values above\n`;
  message += `4. If legitimately changing credentials, update PROTECTED_VALUES in:\n`;
  message += `   scripts/hook-validators/validate-credentials.js\n`;
  message += `\n`;
  message += `Protected values are defined in LICENSE and package.json.\n`;
  message += `Copyright holder: John G Stroh (LICENSE:189)\n`;
  message += `GitHub repository: AgenticGovernance/tractatus-framework\n`;

  return message;
}

// Export for use as module
module.exports = { validate, validateCredentials, PROTECTED_VALUES };

// CLI usage
if (require.main === module) {
  const args = process.argv.slice(2);

  if (args.length < 2) {
    console.error('Usage: validate-credentials.js <file-path> <operation>');
    process.exit(1);
  }

  const [filePath, operation] = args;
  const result = validate(filePath, operation);

  if (!result.valid) {
    console.error(result.message);
    process.exit(1);
  }

  process.exit(0);
}