#!/usr/bin/env node

/**
 * Docker Build and Push Script
 * 
 * Builds Docker images and pushes them to the local registry.
 * Tags images based on git state:
 * - Tagged commit: versioned tags + latest
 * - Untagged commit: .dev suffix + commit hash
 */

const { execSync, spawn } = require('child_process');
const fs = require('fs');
const path = require('path');

// Configuration
const REGISTRY = 'dhg.lol:5000';
const IMAGE_NAME = 'euchre-camp';
const FULL_IMAGE_NAME = `${REGISTRY}/${IMAGE_NAME}`;

// Parse command line arguments
const args = process.argv.slice(2);
const forceVersion = args[0]; // Optional: force a specific version

// Get current version from package.json
function getCurrentVersion() {
  const packageJsonPath = path.join(__dirname, '..', 'package.json');
  const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'));
  return packageJson.version;
}

// Get git commit hash
function getGitCommitHash(short = true) {
  const flag = short ? '--short' : '';
  return execSync(`git rev-parse ${flag} HEAD`, { encoding: 'utf8' }).trim();
}

// Get git tag (if any)
function getGitTag() {
  try {
    const tag = execSync('git describe --tags --exact-match 2>/dev/null', { encoding: 'utf8' }).trim();
    return tag;
  } catch (error) {
    return null;
  }
}

// Check if working directory is clean
function isWorkingDirectoryClean() {
  try {
    const status = execSync('git status --porcelain', { encoding: 'utf8' }).trim();
    return status === '';
  } catch (error) {
    return false;
  }
}

// Build Docker image
async function buildDockerImage(tags, gitCommit) {
  console.log(`🔨 Building Docker image...\n`);

  const buildArgs = [
    'build',
    '--build-arg', `GIT_COMMIT=${gitCommit}`,
    '-t', `${FULL_IMAGE_NAME}:${tags[0]}`, // Primary tag
  ];

  // Add additional tags
  tags.forEach(tag => {
    buildArgs.push('-t', `${FULL_IMAGE_NAME}:${tag}`);
  });

  buildArgs.push('.');

  console.log(`Build command: docker ${buildArgs.join(' ')}\n`);

  return new Promise((resolve, reject) => {
    const docker = spawn('docker', buildArgs, {
      cwd: path.join(__dirname, '..'),
      stdio: 'inherit'
    });

    docker.on('close', (code) => {
      if (code === 0) {
        console.log('✅ Docker image built successfully\n');
        resolve();
      } else {
        reject(new Error(`Docker build failed with code ${code}`));
      }
    });
  });
}

// Push Docker image
async function pushDockerImage(tags) {
  console.log(`🚀 Pushing Docker images to ${REGISTRY}...\n`);

  for (const tag of tags) {
    const imageName = `${FULL_IMAGE_NAME}:${tag}`;
    console.log(`Pushing ${imageName}...`);

    try {
      execSync(`docker push ${imageName}`, { stdio: 'inherit' });
      console.log(`✅ Pushed ${imageName}\n`);
    } catch (error) {
      console.error(`❌ Failed to push ${imageName}:`, error.message);
      throw error;
    }
  }

  console.log('✅ All images pushed successfully\n');
}

// Main function
async function main() {
  console.log('🐳 Docker Build & Push Tool\n');
  console.log(`Registry: ${REGISTRY}`);
  console.log(`Image: ${IMAGE_NAME}\n`);

  // Check if working directory is clean
  if (!isWorkingDirectoryClean()) {
    console.log('⚠️  Warning: Working directory is not clean');
    console.log('   Proceeding anyway...\n');
  }

  // Determine image tags
  const gitCommit = getGitCommitHash();
  const gitTag = getGitTag();
  const version = forceVersion || getCurrentVersion();

  let tags = [];

  if (gitTag) {
    // Tagged commit - use version and 'latest'
    const tagWithoutV = gitTag.startsWith('v') ? gitTag.slice(1) : gitTag;

    if (tagWithoutV !== version) {
      console.log(`⚠️  Warning: Git tag (${gitTag}) doesn't match package.json version (${version})`);
      console.log('   Using package.json version for Docker tags\n');
    }

    tags = [
      version,           // e.g., 0.1.0
      'latest',          // Latest stable
    ];
  } else {
    // Untagged commit - use version with .dev suffix and commit hash
    tags = [
      `${version}.dev`,     // e.g., 0.1.0.dev
      `${version}-sha-${gitCommit}`,  // e.g., 0.1.0-sha-abc123
    ];
  }

  console.log(`Git commit: ${gitCommit}`);
  console.log(`Git tag: ${gitTag || '(none)'}`);
  console.log(`Package version: ${version}`);
  console.log(`Docker tags: ${tags.join(', ')}\n`);

  // Build the image
  await buildDockerImage(tags, gitCommit);

  // Push the images
  await pushDockerImage(tags);

  console.log('🎉 Docker build and push complete!\n');
  console.log('Images available at:');
  tags.forEach(tag => {
    console.log(`  - ${FULL_IMAGE_NAME}:${tag}`);
  });
}

// Run main function
main().catch(error => {
  console.error('❌ Error:', error.message);
  process.exit(1);
});