#!/usr/bin/env node
/**
 * Smart Install Script for claude-mem
 *
 * Ensures Bun runtime and uv (Python package manager) are installed
 * (auto-installs if missing) and handles dependency installation when needed.
 */
import { existsSync, readFileSync, writeFileSync } from 'fs';
import { execSync, spawnSync } from 'child_process';
import { join } from 'path';
import { homedir } from 'os';

const ROOT = join(homedir(), '.claude', 'plugins', 'marketplaces', 'thedotmack');
const MARKER = join(ROOT, '.install-version');
const IS_WINDOWS = process.platform === 'win32';

/**
 * Check if Bun is installed and accessible
 */
function isBunInstalled() {
  try {
    const result = spawnSync('bun', ['--version'], {
      encoding: 'utf-8',
      stdio: ['pipe', 'pipe', 'pipe'],
      shell: IS_WINDOWS
    });
    return result.status === 0;
  } catch {
    return false;
  }
}

/**
 * Get Bun version if installed
 */
function getBunVersion() {
  try {
    const result = spawnSync('bun', ['--version'], {
      encoding: 'utf-8',
      stdio: ['pipe', 'pipe', 'pipe'],
      shell: IS_WINDOWS
    });
    return result.status === 0 ? result.stdout.trim() : null;
  } catch {
    return null;
  }
}

/**
 * Check if uv is installed and accessible
 */
function isUvInstalled() {
  try {
    const result = spawnSync('uv', ['--version'], {
      encoding: 'utf-8',
      stdio: ['pipe', 'pipe', 'pipe'],
      shell: IS_WINDOWS
    });
    return result.status === 0;
  } catch {
    return false;
  }
}

/**
 * Get uv version if installed
 */
function getUvVersion() {
  try {
    const result = spawnSync('uv', ['--version'], {
      encoding: 'utf-8',
      stdio: ['pipe', 'pipe', 'pipe'],
      shell: IS_WINDOWS
    });
    return result.status === 0 ? result.stdout.trim() : null;
  } catch {
    return null;
  }
}

/**
 * Install Bun automatically based on platform
 */
function installBun() {
  console.error('🔧 Bun not found. Installing Bun runtime...');

  try {
    if (IS_WINDOWS) {
      // Windows: Use PowerShell installer
      console.error('   Installing via PowerShell...');
      execSync('powershell -c "irm bun.sh/install.ps1 | iex"', {
        stdio: 'inherit',
        shell: true
      });
    } else {
      // Unix/macOS: Use curl installer
      console.error('   Installing via curl...');
      execSync('curl -fsSL https://bun.sh/install | bash', {
        stdio: 'inherit',
        shell: true
      });
    }

    // Verify installation
    if (isBunInstalled()) {
      const version = getBunVersion();
      console.error(`✅ Bun ${version} installed successfully`);
      return true;
    } else {
      // Bun may be installed but not in PATH yet for this session
      // Try common installation paths
      const bunPaths = IS_WINDOWS
        ? [join(homedir(), '.bun', 'bin', 'bun.exe')]
        : [join(homedir(), '.bun', 'bin', 'bun'), '/usr/local/bin/bun'];

      for (const bunPath of bunPaths) {
        if (existsSync(bunPath)) {
          console.error(`✅ Bun installed at ${bunPath}`);
          console.error('⚠️  Please restart your terminal or add Bun to PATH:');
          if (IS_WINDOWS) {
            console.error(`   $env:Path += ";${join(homedir(), '.bun', 'bin')}"`);
          } else {
            console.error(`   export PATH="$HOME/.bun/bin:$PATH"`);
          }
          return true;
        }
      }

      throw new Error('Bun installation completed but binary not found');
    }
  } catch (error) {
    console.error('❌ Failed to install Bun automatically');
    console.error('   Please install manually:');
    if (IS_WINDOWS) {
      console.error('   - winget install Oven-sh.Bun');
      console.error('   - Or: powershell -c "irm bun.sh/install.ps1 | iex"');
    } else {
      console.error('   - curl -fsSL https://bun.sh/install | bash');
      console.error('   - Or: brew install oven-sh/bun/bun');
    }
    console.error('   Then restart your terminal and try again.');
    throw error;
  }
}

/**
 * Install uv automatically based on platform
 */
function installUv() {
  console.error('🐍 Installing uv for Python/Chroma support...');

  try {
    if (IS_WINDOWS) {
      // Windows: Use PowerShell installer
      console.error('   Installing via PowerShell...');
      execSync('powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"', {
        stdio: 'inherit',
        shell: true
      });
    } else {
      // Unix/macOS: Use curl installer
      console.error('   Installing via curl...');
      execSync('curl -LsSf https://astral.sh/uv/install.sh | sh', {
        stdio: 'inherit',
        shell: true
      });
    }

    // Verify installation
    if (isUvInstalled()) {
      const version = getUvVersion();
      console.error(`✅ uv ${version} installed successfully`);
      return true;
    } else {
      // uv may be installed but not in PATH yet for this session
      // Try common installation paths
      const uvPaths = IS_WINDOWS
        ? [join(homedir(), '.local', 'bin', 'uv.exe'), join(homedir(), '.cargo', 'bin', 'uv.exe')]
        : [join(homedir(), '.local', 'bin', 'uv'), join(homedir(), '.cargo', 'bin', 'uv'), '/usr/local/bin/uv'];

      for (const uvPath of uvPaths) {
        if (existsSync(uvPath)) {
          console.error(`✅ uv installed at ${uvPath}`);
          console.error('⚠️  Please restart your terminal or add uv to PATH:');
          if (IS_WINDOWS) {
            console.error(`   $env:Path += ";${join(homedir(), '.local', 'bin')}"`);
          } else {
            console.error(`   export PATH="$HOME/.local/bin:$PATH"`);
          }
          return true;
        }
      }

      throw new Error('uv installation completed but binary not found');
    }
  } catch (error) {
    console.error('❌ Failed to install uv automatically');
    console.error('   Please install manually:');
    if (IS_WINDOWS) {
      console.error('   - winget install astral-sh.uv');
      console.error('   - Or: powershell -c "irm https://astral.sh/uv/install.ps1 | iex"');
    } else {
      console.error('   - curl -LsSf https://astral.sh/uv/install.sh | sh');
      console.error('   - Or: brew install uv (macOS)');
    }
    console.error('   Then restart your terminal and try again.');
    throw error;
  }
}

/**
 * Check if dependencies need to be installed
 */
function needsInstall() {
  if (!existsSync(join(ROOT, 'node_modules'))) return true;
  try {
    const pkg = JSON.parse(readFileSync(join(ROOT, 'package.json'), 'utf-8'));
    const marker = JSON.parse(readFileSync(MARKER, 'utf-8'));
    return pkg.version !== marker.version || getBunVersion() !== marker.bun;
  } catch {
    return true;
  }
}

/**
 * Install dependencies using Bun
 */
function installDeps() {
  console.error('📦 Installing dependencies with Bun...');
  try {
    execSync('bun install', { cwd: ROOT, stdio: 'inherit', shell: IS_WINDOWS });
  } catch {
    // Retry with force flag
    execSync('bun install --force', { cwd: ROOT, stdio: 'inherit', shell: IS_WINDOWS });
  }

  // Write version marker
  const pkg = JSON.parse(readFileSync(join(ROOT, 'package.json'), 'utf-8'));
  writeFileSync(MARKER, JSON.stringify({
    version: pkg.version,
    bun: getBunVersion(),
    uv: getUvVersion(),
    installedAt: new Date().toISOString()
  }));
}

// Main execution
try {
  // Step 1: Ensure Bun is installed (REQUIRED)
  if (!isBunInstalled()) {
    installBun();

    // Re-check after installation
    if (!isBunInstalled()) {
      console.error('❌ Bun is required but not available in PATH');
      console.error('   Please restart your terminal after installation');
      process.exit(1);
    }
  }

  // Step 2: Ensure uv is installed (REQUIRED for vector search)
  if (!isUvInstalled()) {
    installUv();

    // Re-check after installation
    if (!isUvInstalled()) {
      console.error('❌ uv is required but not available in PATH');
      console.error('   Please restart your terminal after installation');
      process.exit(1);
    }
  }

  // Step 3: Install dependencies if needed
  if (needsInstall()) {
    installDeps();
    console.error('✅ Dependencies installed');
  }
} catch (e) {
  console.error('❌ Installation failed:', e.message);
  process.exit(1);
}