#!/usr/bin/env node
/**
 * WooCommerce Plugin Validator Tool
 * Validates WooCommerce-specific compatibility including HPOS, deprecated functions,
 * and modern WooCommerce standards.
 * Token-efficient: returns minimal output on success, detailed output on failure.
 */

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

const DEPRECATED_WC_PATTERNS = [
  { pattern: /\bwoocommerce_get_page_id\b/, name: "woocommerce_get_page_id", replacement: "wc_get_page_id()" },
  { pattern: /\bwoocommerce_show_messages\b/, name: "woocommerce_show_messages", replacement: "wc_print_notices()" },
  { pattern: /\bglobal\s+\$woocommerce\b/, name: "global $woocommerce", replacement: "WC()" },
  { pattern: /\$woocommerce->cart\b/, name: "$woocommerce->cart", replacement: "WC()->cart" },
  { pattern: /\$woocommerce->customer\b/, name: "$woocommerce->customer", replacement: "WC()->customer" },
  { pattern: /\bwoocommerce_coupon_error\b/, name: "woocommerce_coupon_error", replacement: "wc_add_notice()" },
  { pattern: /\bwoocommerce_add_notice\b/, name: "woocommerce_add_notice", replacement: "wc_add_notice()" },
  { pattern: /\bwoocommerce_get_template\b/, name: "woocommerce_get_template", replacement: "wc_get_template()" },
  { pattern: /\bwoocommerce_get_template_part\b/, name: "woocommerce_get_template_part", replacement: "wc_get_template_part()" },
  { pattern: /\bwoocommerce_locate_template\b/, name: "woocommerce_locate_template", replacement: "wc_locate_template()" },
  { pattern: /\bwoocommerce_clean\b/, name: "woocommerce_clean", replacement: "wc_clean()" },
  { pattern: /\bwoocommerce_array_overlay\b/, name: "woocommerce_array_overlay", replacement: "wc_array_overlay()" },
];

const TOO_FEW_ARGUMENTS_PATTERNS = [
  { pattern: /array_key_exists\s*\(\s*['"][^'"]+['"]\s*\)(?!\s*,)/, name: "array_key_exists", required: "2 arguments (key, array)" },
  { pattern: /str_replace\s*\(\s*[^)]+,\s*[^)]+\s*\)(?!,)/, name: "str_replace", required: "3 arguments (search, replace, subject)" },
  { pattern: /array_slice\s*\(\s*\$[a-zA-Z_]+\s*\)(?!,)/, name: "array_slice", required: "2+ arguments (array, offset)" },
  { pattern: /in_array\s*\(\s*\$[a-zA-Z_]+\s*\)(?!,)/, name: "in_array", required: "2 arguments (needle, haystack)" },
  { pattern: /explode\s*\(\s*['"][^'"]+['"]\s*\)(?!,)/, name: "explode", required: "2 arguments (delimiter, string)" },
  { pattern: /wc_get_order\s*\(\s*\)/, name: "wc_get_order", required: "Order ID argument" },
  { pattern: /wc_get_product\s*\(\s*\)/, name: "wc_get_product", required: "Product ID argument" },
];

function findPhpFiles(dir) {
  const files = [];
  
  function walk(currentDir) {
    const entries = fs.readdirSync(currentDir, { withFileTypes: true });
    
    for (const entry of entries) {
      const fullPath = path.join(currentDir, entry.name);
      if (entry.isDirectory()) {
        if (!["vendor", "node_modules"].includes(entry.name)) {
          walk(fullPath);
        }
      } else if (entry.name.endsWith(".php")) {
        files.push(fullPath);
      }
    }
  }
  
  walk(dir);
  return files;
}

function getLineNumber(content, index) {
  return content.substring(0, index).split("\n").length;
}

function checkHposCompatibility(filePath, content) {
  const issues = [];
  
  const hasHposDeclaration = /FeaturesUtil::declare_compatibility/.test(content);
  const hasCustomOrderTables = /['"]custom_order_tables['"]/.test(content);
  
  if (!hasHposDeclaration) {
    issues.push({
      check: "HPOS Compatibility",
      file: filePath,
      issue: "HPOS compatibility not declared",
      severity: "critical",
      suggestion: "Use \\Automattic\\WooCommerce\\Utilities\\FeaturesUtil::declare_compatibility",
    });
  } else if (!hasCustomOrderTables) {
    issues.push({
      check: "HPOS Compatibility",
      file: filePath,
      issue: "HPOS declared but 'custom_order_tables' missing",
      severity: "critical",
      suggestion: "Add 'custom_order_tables' to compatibility declaration",
    });
  }
  
  // Check for legacy meta functions on orders
  const legacyMetaPattern = /(get|update|add|delete)_post_meta\s*\(\s*\$(order|wc_order|item)/g;
  let match;
  while ((match = legacyMetaPattern.exec(content)) !== null) {
    issues.push({
      check: "HPOS Violation",
      file: filePath,
      line: getLineNumber(content, match.index),
      issue: "Legacy meta function on order variable",
      severity: "critical",
      suggestion: "Use $order->get_meta(), $order->update_meta_data()",
    });
  }
  
  // Check for deprecated property access
  const deprecatedPropertyPattern = /\$[a-zA-Z0-9_]*order->id(?!\s*\()/g;
  while ((match = deprecatedPropertyPattern.exec(content)) !== null) {
    issues.push({
      check: "Deprecated Access",
      file: filePath,
      line: getLineNumber(content, match.index),
      issue: "Direct access to $order->id",
      severity: "critical",
      suggestion: "Use $order->get_id()",
    });
  }
  
  return issues;
}

function checkVersionHeaders(filePath, content) {
  const issues = [];
  
  const wcTested = /WC tested up to:\s*(.+)/.exec(content);
  const wcRequired = /WC requires at least:\s*(.+)/.exec(content);
  
  if (!wcTested) {
    issues.push({
      check: "Version Headers",
      file: filePath,
      issue: "Missing 'WC tested up to' header",
      severity: "critical",
      suggestion: "Add WooCommerce tested version header",
    });
  } else {
    const version = wcTested[1].trim();
    if (!/^(8|9)\./.test(version)) {
      issues.push({
        check: "Version Headers",
        file: filePath,
        issue: `WC tested version (${version}) seems old (pre-8.0)`,
        severity: "warning",
        suggestion: "Update to recent WooCommerce version",
      });
    }
  }
  
  if (!wcRequired) {
    issues.push({
      check: "Version Headers",
      file: filePath,
      issue: "Missing 'WC requires at least' header",
      severity: "critical",
      suggestion: "Add minimum WooCommerce version requirement",
    });
  }
  
  return issues;
}

function checkDeprecatedFunctions(filePath, content) {
  const issues = [];
  
  for (const { pattern, name, replacement } of DEPRECATED_WC_PATTERNS) {
    let match;
    while ((match = pattern.exec(content)) !== null) {
      issues.push({
        check: "Deprecated WooCommerce Code",
        file: filePath,
        line: getLineNumber(content, match.index),
        issue: `Found deprecated code '${name}'`,
        severity: "critical",
        suggestion: `Use ${replacement}`,
      });
    }
  }
  
  return issues;
}

function checkDatabaseSafety(filePath, content) {
  const issues = [];
  
  // Check for CREATE TABLE without dbDelta
  if (/CREATE\s+TABLE/i.test(content) && !/dbDelta/.test(content)) {
    issues.push({
      check: "Database Safety",
      file: filePath,
      issue: "CREATE TABLE found without dbDelta",
      severity: "critical",
      suggestion: "Use dbDelta() for table creation",
    });
  }
  
  // Check for wp_options bloat
  const optionsPattern = /INSERT\s+INTO.*wp_options.*woocommerce/gi;
  let match;
  while ((match = optionsPattern.exec(content)) !== null) {
    issues.push({
      check: "Database Performance",
      file: filePath,
      line: getLineNumber(content, match.index),
      issue: "Inserting WooCommerce data directly into wp_options",
      severity: "warning",
      suggestion: "Avoid cluttering autoloaded options table",
    });
  }
  
  return issues;
}

function checkBlocksCompatibility(filePath, content) {
  const issues = [];
  
  const hasBlocksIntegration = /woocommerce_blocks|StoreApi|IntegrationInterface/.test(content);
  
  if (!hasBlocksIntegration && /cart|checkout|order/i.test(filePath)) {
    issues.push({
      check: "Blocks Compatibility",
      file: filePath,
      issue: "No Cart/Checkout Blocks integration detected",
      severity: "warning",
      suggestion: "Plugin may break in Block-based checkouts",
    });
  }
  
  return issues;
}

function checkLoggingStandards(filePath, content) {
  const issues = [];
  
  if (/error_log/.test(content)) {
    issues.push({
      check: "Logging Standards",
      file: filePath,
      issue: "error_log found",
      severity: "warning",
      suggestion: "Use WC_Logger instead",
    });
  }
  
  if (/wp_insert_comment.*order/i.test(content)) {
    issues.push({
      check: "Order Notes",
      file: filePath,
      issue: "Inserting comments directly for orders",
      severity: "critical",
      suggestion: "Use $order->add_order_note()",
    });
  }
  
  return issues;
}

function checkAjaxSecurity(filePath, content) {
  const issues = [];
  
  if (/add_action.*wp_ajax_/.test(content)) {
    if (!/check_ajax_referer|wp_verify_nonce/.test(content)) {
      issues.push({
        check: "AJAX Security",
        file: filePath,
        issue: "AJAX action missing nonce verification",
        severity: "critical",
        suggestion: "Add check_ajax_referer()",
      });
    }
    
    if (!/current_user_can|check_ajax_referer/.test(content)) {
      issues.push({
        check: "AJAX Security",
        file: filePath,
        issue: "AJAX action missing capability check",
        severity: "critical",
        suggestion: "Add current_user_can()",
      });
    }
  }
  
  // Check for die() in AJAX handlers
  if (/wp_die\(|die\(/.test(content) && /wp_ajax_/.test(content)) {
    issues.push({
      check: "AJAX Error Handling",
      file: filePath,
      issue: "Direct wp_die() or die() in AJAX handler",
      severity: "critical",
      suggestion: "Use wp_send_json_error() instead",
    });
  }
  
  return issues;
}

function checkDeprecatedOrderProperties(filePath, content) {
  const issues = [];
  
  const deprecatedProps = /\$order->(order_type|customer_id|customer_note|post_status)/g;
  let match;
  while ((match = deprecatedProps.exec(content)) !== null) {
    issues.push({
      check: "Deprecated Order Property",
      file: filePath,
      line: getLineNumber(content, match.index),
      issue: `Direct property access removed: ${match[1]}`,
      severity: "critical",
      suggestion: "Use getter methods",
    });
  }
  
  return issues;
}

function checkTooFewArguments(filePath, content) {
  const issues = [];
  
  for (const { pattern, name, required } of TOO_FEW_ARGUMENTS_PATTERNS) {
    let match;
    while ((match = pattern.exec(content)) !== null) {
      issues.push({
        check: "Too Few Arguments",
        file: filePath,
        line: getLineNumber(content, match.index),
        issue: `${name}() called with insufficient arguments`,
        severity: "critical",
        suggestion: `Requires ${required}`,
      });
    }
  }
  
  return issues;
}

function checkPaymentGateway(filePath, content) {
  const issues = [];
  
  if (/WC_Payment_Gateway/.test(content)) {
    if (!/process_payment|transaction_result/.test(content)) {
      issues.push({
        check: "Payment Gateway",
        file: filePath,
        issue: "Incomplete payment gateway implementation",
        severity: "warning",
        suggestion: "Missing process_payment() method",
      });
    }
  }
  
  return issues;
}

function checkShippingMethod(filePath, content) {
  const issues = [];
  
  if (/WC_Shipping_Method/.test(content)) {
    if (!/calculate_shipping/.test(content)) {
      issues.push({
        check: "Shipping Method",
        file: filePath,
        issue: "Incomplete shipping method implementation",
        severity: "warning",
        suggestion: "Missing calculate_shipping() method",
      });
    }
  }
  
  return issues;
}

function validateWooCommerce(pluginPath) {
  const result = {
    status: "pass",
    summary: "",
    pluginPath,
    checksRun: 10,
    errors: [],
    warnings: [],
    stats: {
      filesScanned: 0,
      criticalCount: 0,
      warningCount: 0,
    },
  };
  
  if (!fs.existsSync(pluginPath)) {
    result.status = "fail";
    result.summary = "Plugin directory not found";
    return result;
  }
  
  const phpFiles = findPhpFiles(pluginPath);
  result.stats.filesScanned = phpFiles.length;
  
  if (phpFiles.length === 0) {
    result.status = "fail";
    result.summary = "No PHP files found";
    return result;
  }
  
  let mainFile = "";
  for (const file of phpFiles) {
    const content = fs.readFileSync(file, "utf-8");
    if (/Plugin Name:/.test(content)) {
      mainFile = file;
      break;
    }
  }
  
  // Run all checks
  for (const file of phpFiles) {
    const content = fs.readFileSync(file, "utf-8");
    const relativePath = path.relative(pluginPath, file);
    
    result.errors.push(...checkHposCompatibility(relativePath, content));
    result.errors.push(...checkDeprecatedFunctions(relativePath, content));
    result.errors.push(...checkDatabaseSafety(relativePath, content));
    result.errors.push(...checkBlocksCompatibility(relativePath, content));
    result.warnings.push(...checkLoggingStandards(relativePath, content));
    result.errors.push(...checkAjaxSecurity(relativePath, content));
    result.errors.push(...checkDeprecatedOrderProperties(relativePath, content));
    result.errors.push(...checkTooFewArguments(relativePath, content));
    result.warnings.push(...checkPaymentGateway(relativePath, content));
    result.warnings.push(...checkShippingMethod(relativePath, content));
  }
  
  // Check version headers in main file
  if (mainFile) {
    const content = fs.readFileSync(mainFile, "utf-8");
    const relativePath = path.relative(pluginPath, mainFile);
    result.errors.push(...checkVersionHeaders(relativePath, content));
  }
  
  // Update stats
  result.stats.criticalCount = result.errors.length;
  result.stats.warningCount = result.warnings.length;
  
  // Determine status
  if (result.errors.length > 0) {
    result.status = "fail";
    result.summary = `${result.errors.length} critical issues, ${result.warnings.length} warnings`;
  } else if (result.warnings.length > 0) {
    result.status = "pass";
    result.summary = `All checks passed with ${result.warnings.length} warnings`;
  } else {
    result.status = "pass";
    result.summary = "All 10 checks passed";
  }
  
  return result;
}

// CLI entry point
if (require.main === module) {
  const pluginPath = process.argv[2];
  
  if (!pluginPath) {
    console.error("Usage: node woocommerce-validate.cjs <plugin-path>");
    process.exit(1);
  }
  
  const result = validateWooCommerce(pluginPath);
  console.log(JSON.stringify(result, null, 2));
  process.exit(result.status === "fail" ? 1 : 0);
}

module.exports = { validateWooCommerce };