/**
 * Expo Config Plugin to bundle TTS model files for iOS
 * Uses a Run Script build phase to copy models during build
 */
const { withXcodeProject } = require('@expo/config-plugins');
const path = require('path');
const fs = require('fs');

const withTTSModels = (config) => {
  return withXcodeProject(config, async (config) => {
    const projectRoot = config.modRequest.projectRoot;
    const xcodeProject = config.modResults;

    // Source model directory (relative to project root)
    const modelSrcDir = path.join(projectRoot, 'assets', 'tts-models');

    if (!fs.existsSync(modelSrcDir)) {
      console.warn('[withTTSModels] ⚠️  Model directory not found:', modelSrcDir);
      return config;
    }

    console.log('[withTTSModels] Found models at:', modelSrcDir);

    // Get the first target
    const target = xcodeProject.getFirstTarget();
    if (!target) {
      console.error('[withTTSModels] ❌ No target found');
      return config;
    }

    // Path relative to ios directory (where Xcode project lives)
    const iosDir = path.join(projectRoot, 'ios');
    const relativeModelPath = path.relative(iosDir, modelSrcDir);

    console.log('[withTTSModels] Relative path from ios/:', relativeModelPath);

    // Create a Run Script build phase to copy ONLY Lessac model during build
    const scriptName = '[TTS] Copy Model Files';
    const scriptContent = [
      '# Copy TTS model files to app bundle (ONLY Lessac voice)',
      'echo "📦 Copying TTS model to app bundle..."',
      '',
      'SOURCE_DIR="${SRCROOT}/' + relativeModelPath + '"',
      'DEST_DIR="${BUILT_PRODUCTS_DIR}/${PRODUCT_NAME}.app/assets/tts-models"',
      'LESSAC_MODEL="vits-piper-en_US-lessac-medium"',
      '',
      '# Only copy Lessac model',
      'if [ -d "$SOURCE_DIR/$LESSAC_MODEL" ]; then',
      '  mkdir -p "$DEST_DIR"',
      '  cp -R "$SOURCE_DIR/$LESSAC_MODEL" "$DEST_DIR/"',
      '  MODEL_SIZE=$(du -sh "$SOURCE_DIR/$LESSAC_MODEL" | cut -f1)',
      '  echo "✅ Lessac TTS model copied successfully ($MODEL_SIZE)"',
      '  echo "   From: $SOURCE_DIR/$LESSAC_MODEL"',
      '  echo "   To: $DEST_DIR/$LESSAC_MODEL"',
      'else',
      '  echo "⚠️  Lessac model not found at: $SOURCE_DIR/$LESSAC_MODEL"',
      '  exit 1',
      'fi'
    ].join('\n');

    // Check if script already exists
    const buildPhases = xcodeProject.hash.project.objects.PBXShellScriptBuildPhase || {};
    let scriptExists = false;

    for (const key in buildPhases) {
      if (buildPhases[key].name === scriptName) {
        scriptExists = true;
        console.log('[withTTSModels] Run Script phase already exists');
        break;
      }
    }

    if (!scriptExists) {
      // Add the Run Script build phase
      xcodeProject.addBuildPhase(
        [],
        'PBXShellScriptBuildPhase',
        scriptName,
        target.uuid,
        {
          shellPath: '/bin/sh',
          shellScript: scriptContent,
          // Run before Copy Bundle Resources phase
          runOnlyForDeploymentPostprocessing: 0
        }
      );

      console.log('[withTTSModels] ✅ Added Run Script build phase');
    }

    console.log('[withTTSModels] ✅ Plugin configured successfully');
    return config;
  });
};

module.exports = withTTSModels;