#!/usr/bin/env node
/**
 * Android Release Script - Universal Version
 * 
 * Automatically builds Android APK and uploads to Gitea Release.
 * 
 * Features:
 * - Auto-detect Android project root (standalone or monorepo)
 * - Auto-detect Gitea config from git remote URL (HTTPS/SSH)
 * - Auto-detect Java Home from Android Studio
 * - Support tag-based release workflow
 * 
 * Environment Variables:
 * - GITEA_TOKEN (required): Gitea API token
 * - GITEA_API_URL (optional): Override Gitea API URL
 * - GITEA_OWNER (optional): Override repository owner
 * - GITEA_REPO (optional): Override repository name
 * 
 * Usage:
 *   node release-android.mjs [android-dir]
 *   
 *   If android-dir is not specified, will auto-detect from current directory.
 */

import fs from 'node:fs';
import path from 'node:path';
import { execSync } from 'node:child_process';

// ============================================================================
// Project Detection
// ============================================================================

/**
 * Find Android project root directory
 * Looks for app/build.gradle.kts or build.gradle.kts with android plugin
 */
function findAndroidRoot(startDir) {
  const candidates = [
    startDir,                           // Current dir is Android root
    path.join(startDir, 'android'),     // Monorepo: ./android/
    path.join(startDir, '..'),          // Parent dir
  ];

  for (const dir of candidates) {
    const buildGradle = path.join(dir, 'app/build.gradle.kts');
    const buildGradleGroovy = path.join(dir, 'app/build.gradle');
    
    if (fs.existsSync(buildGradle) || fs.existsSync(buildGradleGroovy)) {
      return path.resolve(dir);
    }
  }

  return null;
}

/**
 * Find git repository root
 */
function findGitRoot(startDir) {
  try {
    const result = execSync('git rev-parse --show-toplevel', {
      cwd: startDir,
      encoding: 'utf-8',
      shell: true,
      stdio: ['pipe', 'pipe', 'pipe']
    }).trim();
    return result;
  } catch {
    return null;
  }
}

/**
 * Detect if project is a monorepo (Android is a subdirectory)
 */
function isMonorepo(androidDir, gitRoot) {
  if (!gitRoot) return false;
  return path.resolve(androidDir) !== path.resolve(gitRoot);
}

// ============================================================================
// Git/Gitea Configuration
// ============================================================================

/**
 * Parse git remote URL to extract Gitea configuration
 * Supports both HTTPS and SSH formats
 */
function detectGiteaConfig(gitRoot) {
  try {
    const remoteUrl = execSync('git remote get-url origin', {
      cwd: gitRoot,
      encoding: 'utf-8',
      shell: true,
      stdio: ['pipe', 'pipe', 'pipe']
    }).trim();

    // HTTPS format: https://git.example.com/owner/repo.git
    const httpsMatch = remoteUrl.match(/https?:\/\/([^/]+)\/([^/]+)\/([^/]+?)(\.git)?$/);
    if (httpsMatch) {
      return {
        apiUrl: `https://${httpsMatch[1]}`,
        owner: httpsMatch[2],
        repo: httpsMatch[3]
      };
    }

    // SSH format: git@git.example.com:owner/repo.git
    const sshMatch = remoteUrl.match(/git@([^:]+):([^/]+)\/([^/]+?)(\.git)?$/);
    if (sshMatch) {
      return {
        apiUrl: `https://${sshMatch[1]}`,
        owner: sshMatch[2],
        repo: sshMatch[3]
      };
    }
  } catch {
    // Ignore errors
  }
  return {};
}

// ============================================================================
// Java Detection
// ============================================================================

/**
 * Detect Java Home, prioritizing Android Studio's bundled JDK
 */
function detectJavaHome() {
  const possiblePaths = [
    // macOS - Android Studio bundled JDK
    '/Applications/Android Studio.app/Contents/jbr/Contents/Home',
    '/Applications/Android Studio.app/Contents/jre/Contents/Home',
    // Linux - Android Studio bundled JDK
    `${process.env.HOME}/android-studio/jbr`,
    `${process.env.HOME}/android-studio/jre`,
    // Environment variable
    process.env.JAVA_HOME,
    // Common system paths
    '/usr/lib/jvm/java-11-openjdk',
    '/usr/lib/jvm/java-17-openjdk',
  ];

  for (const javaHome of possiblePaths) {
    if (javaHome && fs.existsSync(javaHome)) {
      const javaBin = path.join(javaHome, 'bin', 'java');
      if (fs.existsSync(javaBin)) {
        return javaHome;
      }
    }
  }

  return null;
}

// ============================================================================
// Version & Tag Management
// ============================================================================

/**
 * Read version from build.gradle.kts
 */
function readVersion(androidDir) {
  const buildGradlePath = path.join(androidDir, 'app/build.gradle.kts');
  const buildGradleGroovyPath = path.join(androidDir, 'app/build.gradle');
  
  let buildGradle;
  if (fs.existsSync(buildGradlePath)) {
    buildGradle = fs.readFileSync(buildGradlePath, 'utf-8');
  } else if (fs.existsSync(buildGradleGroovyPath)) {
    buildGradle = fs.readFileSync(buildGradleGroovyPath, 'utf-8');
  } else {
    return null;
  }

  const versionMatch = buildGradle.match(/versionName\s*[=:]\s*["']([^"']+)["']/);
  return versionMatch ? versionMatch[1] : null;
}

/**
 * Get tag name based on project structure
 */
function getTagName(version, isMonorepoProject) {
  // Monorepo uses prefixed tag, standalone uses v-prefix
  return isMonorepoProject ? `android-${version}` : `v${version}`;
}

/**
 * Get tag information (check existence and get annotation)
 */
function getTagInfo(tagName, gitRoot) {
  try {
    const tagExists = execSync(`git tag -l ${tagName}`, {
      cwd: gitRoot,
      encoding: 'utf-8',
      shell: true,
      stdio: ['pipe', 'pipe', 'pipe']
    }).trim();

    if (!tagExists) {
      return { exists: false };
    }

    // Get tag annotation
    const annotation = execSync(`git tag -l --format='%(contents)' ${tagName}`, {
      cwd: gitRoot,
      encoding: 'utf-8',
      shell: true,
      stdio: ['pipe', 'pipe', 'pipe']
    }).trim();

    if (annotation) {
      return { exists: true, message: annotation };
    }

    // Fall back to commit message
    const commitMsg = execSync(`git log -1 --format=%B ${tagName}`, {
      cwd: gitRoot,
      encoding: 'utf-8',
      shell: true,
      stdio: ['pipe', 'pipe', 'pipe']
    }).trim();

    return { exists: true, message: commitMsg || `Release ${tagName}` };
  } catch {
    return { exists: false };
  }
}

// ============================================================================
// Build & Upload
// ============================================================================

/**
 * Build Android APK
 */
function buildApk(androidDir, javaHome) {
  console.log('Building APK...');
  execSync('./gradlew assembleRelease --quiet', {
    cwd: androidDir,
    stdio: 'inherit',
    shell: true,
    env: { ...process.env, JAVA_HOME: javaHome }
  });
}

/**
 * Find built APK file
 */
function findApk(androidDir) {
  const signedApkPath = path.join(androidDir, 'app/build/outputs/apk/release/app-release.apk');
  const unsignedApkPath = path.join(androidDir, 'app/build/outputs/apk/release/app-release-unsigned.apk');

  if (fs.existsSync(signedApkPath)) {
    return { path: signedApkPath, signed: true };
  } else if (fs.existsSync(unsignedApkPath)) {
    return { path: unsignedApkPath, signed: false };
  }
  return null;
}

/**
 * Execute curl and return JSON response
 */
function curlJson(cmd) {
  try {
    const result = execSync(cmd, { encoding: 'utf-8', shell: true, stdio: ['pipe', 'pipe', 'pipe'] });
    return JSON.parse(result);
  } catch {
    return null;
  }
}

/**
 * Upload APK to Gitea Release
 */
function uploadToGitea(config) {
  const { apiUrl, owner, repo, token, tagName, fileName, apkPath, releaseMessage } = config;
  
  const repoApiBase = `${apiUrl}/api/v1/repos/${owner}/${repo}`;
  
  // Get or create release
  let releaseId;
  const releases = curlJson(
    `curl -s -H "Authorization: token ${token}" "${repoApiBase}/releases"`
  );

  if (Array.isArray(releases)) {
    const existingRelease = releases.find((r) => r.tag_name === tagName);
    if (existingRelease) {
      releaseId = existingRelease.id;
      console.log(`Found existing Release (ID: ${releaseId})`);

      // Delete existing asset with same name
      const existingAsset = (existingRelease.assets || []).find((a) => a.name === fileName);
      if (existingAsset) {
        console.log(`Deleting existing asset: ${fileName}`);
        execSync(
          `curl -s -X DELETE -H "Authorization: token ${token}" "${repoApiBase}/releases/${releaseId}/assets/${existingAsset.id}"`,
          { shell: true, stdio: ['pipe', 'pipe', 'pipe'] }
        );
      }
    }
  }

  if (!releaseId) {
    console.log('Creating new Release...');
    const releaseData = {
      tag_name: tagName,
      name: `Android APK ${tagName}`,
      body: releaseMessage,
      draft: false,
      prerelease: false
    };

    const tempJsonPath = path.join(process.cwd(), '.release-data.json');
    fs.writeFileSync(tempJsonPath, JSON.stringify(releaseData));

    const releaseInfo = curlJson(
      `curl -s -X POST "${repoApiBase}/releases" \
        -H "Authorization: token ${token}" \
        -H "Content-Type: application/json" \
        -d @${tempJsonPath}`
    );

    fs.unlinkSync(tempJsonPath);

    if (!releaseInfo || !releaseInfo.id) {
      throw new Error(`Failed to create release: ${JSON.stringify(releaseInfo)}`);
    }

    releaseId = releaseInfo.id;
    console.log(`Release created (ID: ${releaseId})`);
  }

  // Upload APK
  console.log('Uploading APK...');
  const uploadUrl = `${repoApiBase}/releases/${releaseId}/assets?name=${encodeURIComponent(fileName)}`;
  const uploadResult = curlJson(
    `curl -s -X POST "${uploadUrl}" \
      -H "Authorization: token ${token}" \
      -F "attachment=@${apkPath}"`
  );

  if (!uploadResult || !uploadResult.id) {
    throw new Error(`Failed to upload APK: ${JSON.stringify(uploadResult)}`);
  }

  return {
    releaseUrl: `${apiUrl}/${owner}/${repo}/releases/tag/${tagName}`,
    fileSize: uploadResult.size
  };
}

// ============================================================================
// Main
// ============================================================================

function main() {
  const cwd = process.cwd();
  const argDir = process.argv[2];

  console.log('='.repeat(60));
  console.log('Android Release Script');
  console.log('='.repeat(60));

  // 1. Find Android project root
  const searchDir = argDir ? path.resolve(cwd, argDir) : cwd;
  const androidDir = findAndroidRoot(searchDir);
  
  if (!androidDir) {
    console.error('Error: Cannot find Android project');
    console.error('Make sure you are in an Android project directory or specify the path');
    console.error('Usage: release-android [android-dir]');
    process.exit(1);
  }
  console.log(`Android project: ${androidDir}`);

  // 2. Find git root
  const gitRoot = findGitRoot(androidDir);
  if (!gitRoot) {
    console.error('Error: Not a git repository');
    process.exit(1);
  }
  console.log(`Git root: ${gitRoot}`);

  const monorepo = isMonorepo(androidDir, gitRoot);
  console.log(`Project type: ${monorepo ? 'Monorepo' : 'Standalone'}`);

  // 3. Detect Gitea configuration
  const detected = detectGiteaConfig(gitRoot);
  const GITEA_TOKEN = process.env.GITEA_TOKEN || '';
  const GITEA_API_URL = process.env.GITEA_API_URL || detected.apiUrl || '';
  const GITEA_OWNER = process.env.GITEA_OWNER || detected.owner || '';
  const GITEA_REPO = process.env.GITEA_REPO || detected.repo || '';

  if (!GITEA_TOKEN) {
    console.error('Error: GITEA_TOKEN environment variable is not set');
    console.error('Please set: export GITEA_TOKEN="your_token"');
    process.exit(1);
  }

  if (!GITEA_API_URL || !GITEA_OWNER || !GITEA_REPO) {
    console.error('Error: Cannot detect Gitea repository configuration');
    console.error('Please set environment variables: GITEA_API_URL, GITEA_OWNER, GITEA_REPO');
    process.exit(1);
  }

  console.log(`Gitea: ${GITEA_API_URL}/${GITEA_OWNER}/${GITEA_REPO}`);

  // 4. Read version
  const version = readVersion(androidDir);
  if (!version) {
    console.error('Error: Cannot read versionName from build.gradle');
    process.exit(1);
  }
  console.log(`Version: ${version}`);

  // 5. Check tag
  const tagName = getTagName(version, monorepo);
  const tagInfo = getTagInfo(tagName, gitRoot);

  if (!tagInfo.exists) {
    console.error(`Error: Git tag "${tagName}" not found`);
    console.error('');
    console.error('Please create a tag before releasing:');
    console.error(`  git tag -a ${tagName} -m "Release notes"`);
    console.error(`  git push origin ${tagName}`);
    process.exit(1);
  }
  console.log(`Tag: ${tagName}`);

  // 6. Detect Java
  const javaHome = detectJavaHome();
  if (!javaHome) {
    console.error('Error: Cannot find Java Runtime');
    console.error('Please install JDK or ensure Android Studio is properly installed');
    process.exit(1);
  }
  console.log(`Java: ${javaHome}`);

  console.log('');
  console.log('Building...');

  // 7. Build APK
  try {
    buildApk(androidDir, javaHome);
  } catch (err) {
    console.error('Build failed:', err.message);
    process.exit(1);
  }

  // 8. Find APK
  const apk = findApk(androidDir);
  if (!apk) {
    console.error('Error: APK file not found');
    console.error('Check build output at: app/build/outputs/apk/release/');
    process.exit(1);
  }
  console.log(`APK: ${apk.path} (${apk.signed ? 'signed' : 'unsigned'})`);

  // 9. Upload to Gitea
  const fileName = `${GITEA_REPO}-android-${version}.apk`;
  
  console.log('');
  console.log('Uploading to Gitea...');

  try {
    const result = uploadToGitea({
      apiUrl: GITEA_API_URL,
      owner: GITEA_OWNER,
      repo: GITEA_REPO,
      token: GITEA_TOKEN,
      tagName,
      fileName,
      apkPath: apk.path,
      releaseMessage: tagInfo.message
    });

    console.log('');
    console.log('='.repeat(60));
    console.log('Release successful!');
    console.log(`File: ${fileName}`);
    console.log(`Size: ${(result.fileSize / 1024 / 1024).toFixed(2)} MB`);
    console.log(`URL: ${result.releaseUrl}`);
    console.log('='.repeat(60));
  } catch (err) {
    console.error('Upload failed:', err.message);
    process.exit(1);
  }
}

main();