#!/usr/bin/env node
/**
 * Validates chain configuration for Chainlists submission
 */

import { readFileSync } from 'fs';
import { fileURLToPath } from 'url';
import { dirname, resolve } from 'path';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const REQUIRED_FIELDS = [
  'name',
  'chain',
  'chainId',
  'networkId',
  'rpc',
  'nativeCurrency'
];

function validateChainConfig(filePath) {
  console.log(`\n🔍 Validating chain configuration: ${filePath}\n`);

  let config;
  try {
    const fileContent = readFileSync(filePath, 'utf-8');
    config = JSON.parse(fileContent);
  } catch (error) {
    console.error('❌ Error reading or parsing chain config file:');
    console.error(`   ${error.message}`);
    process.exit(1);
  }

  const errors = [];
  const warnings = [];

  // Validate required fields
  REQUIRED_FIELDS.forEach(field => {
    if (!(field in config)) {
      errors.push(`Missing required field: ${field}`);
    }
  });

  // Validate chainId
  if (config.chainId !== 138) {
    errors.push(`chainId must be 138, got ${config.chainId}`);
  }

  // Validate networkId
  if (config.networkId && config.networkId !== 138) {
    warnings.push(`networkId should match chainId (138), got ${config.networkId}`);
  }

  // Validate RPC URLs
  if (!Array.isArray(config.rpc) || config.rpc.length === 0) {
    errors.push('rpc must be a non-empty array');
  } else {
    config.rpc.forEach((url, index) => {
      if (typeof url !== 'string' || (!url.startsWith('http://') && !url.startsWith('https://'))) {
        errors.push(`rpc[${index}] must be a valid HTTP/HTTPS URL`);
      }
      if (url.startsWith('http://')) {
        warnings.push(`rpc[${index}] should use HTTPS, not HTTP: ${url}`);
      }
    });
  }

  // Validate nativeCurrency
  if (config.nativeCurrency) {
    if (!config.nativeCurrency.symbol) {
      errors.push('nativeCurrency.symbol is required');
    }
    if (typeof config.nativeCurrency.decimals !== 'number') {
      errors.push('nativeCurrency.decimals must be a number');
    }
    if (config.nativeCurrency.symbol !== 'ETH') {
      warnings.push(`Expected nativeCurrency.symbol to be "ETH", got "${config.nativeCurrency.symbol}"`);
    }
    if (config.nativeCurrency.decimals !== 18) {
      warnings.push(`Expected nativeCurrency.decimals to be 18, got ${config.nativeCurrency.decimals}`);
    }
  }

  // Validate explorers (optional but recommended)
  if (config.explorers && Array.isArray(config.explorers)) {
    config.explorers.forEach((explorer, index) => {
      if (!explorer.url) {
        errors.push(`explorers[${index}].url is required`);
      }
      if (explorer.url && !explorer.url.startsWith('https://')) {
        warnings.push(`explorers[${index}].url should use HTTPS: ${explorer.url}`);
      }
      if (!explorer.name) {
        warnings.push(`explorers[${index}].name is recommended`);
      }
      if (!explorer.standard) {
        warnings.push(`explorers[${index}].standard is recommended (e.g., "EIP3091")`);
      }
    });
  } else {
    warnings.push('No explorers configured (recommended for better UX)');
  }

  // Validate shortName
  if (config.shortName && typeof config.shortName !== 'string') {
    errors.push('shortName must be a string');
  } else if (!config.shortName) {
    warnings.push('shortName is recommended');
  }

  // Validate icon (optional)
  if (config.icon && !config.icon.startsWith('https://') && !config.icon.startsWith('ipfs://')) {
    warnings.push(`icon should use HTTPS or IPFS URL: ${config.icon}`);
  }

  // Report results
  if (errors.length > 0) {
    console.error('❌ Validation failed!\n');
    console.error('Errors:');
    errors.forEach(error => console.error(`   ❌ ${error}`));
    console.log('');
    if (warnings.length > 0) {
      console.log('⚠️  Warnings:');
      warnings.forEach(warning => console.log(`   ⚠️  ${warning}`));
      console.log('');
    }
    process.exit(1);
  }

  console.log('✅ Chain configuration is valid!\n');

  if (warnings.length > 0) {
    console.log('⚠️  Warnings:');
    warnings.forEach(warning => console.log(`   ⚠️  ${warning}`));
    console.log('');
  }

  console.log('📋 Configuration Summary:');
  console.log(`   Name: ${config.name}`);
  console.log(`   Chain: ${config.chain}`);
  console.log(`   Short Name: ${config.shortName || '(not set)'}`);
  console.log(`   Chain ID: ${config.chainId}`);
  console.log(`   Network ID: ${config.networkId || '(not set)'}`);
  console.log(`   RPC URLs: ${config.rpc.length}`);
  config.rpc.forEach((url, i) => console.log(`     ${i + 1}. ${url}`));
  if (config.explorers && config.explorers.length > 0) {
    console.log(`   Explorers: ${config.explorers.length}`);
    config.explorers.forEach((exp, i) => {
      console.log(`     ${i + 1}. ${exp.name || '(unnamed)'}: ${exp.url}`);
      if (exp.standard) {
        console.log(`        Standard: ${exp.standard}`);
      }
    });
  }
  if (config.nativeCurrency) {
    console.log(`   Native Currency: ${config.nativeCurrency.symbol} (${config.nativeCurrency.decimals} decimals)`);
  }
  if (config.infoURL) {
    console.log(`   Info URL: ${config.infoURL}`);
  }
  console.log('');

  process.exit(0);
}

// Main
const filePath = process.argv[2] || resolve(__dirname, '../chainlists/chain-138.json');

if (!filePath) {
  console.error('Usage: node validate-chainlists.js [path/to/chain.json]');
  process.exit(1);
}

validateChainConfig(filePath);