const fs = require('node:fs');
const path = require('node:path');
const { withXcodeProject } = require('@expo/config-plugins');

const SHARE_EXTENSION_DIRECTORY = 'InFEDEOhochladen';
const SIRI_INTENTS_FILE = 'FEDEOSiriIntents.swift';

function replaceOnce(source, search, replacement, label) {
  if (!source.includes(search)) {
    throw new Error(`Multi-File-Patch konnte ${label} nicht finden.`);
  }
  return source.replace(search, replacement);
}

module.exports = function withShareIntentMultifile(config) {
  return withXcodeProject(config, async (modConfig) => {
      const siriTemplatePath = path.join(__dirname, 'ios', SIRI_INTENTS_FILE);
      const siriDestinationPath = path.join(modConfig.modRequest.platformProjectRoot, 'FEDEO', SIRI_INTENTS_FILE);
      fs.copyFileSync(siriTemplatePath, siriDestinationPath);

      const project = modConfig.modResults;
      const appTarget = project.pbxTargetByName('FEDEO');
      const appGroup = project.pbxGroupByName('FEDEO');
      const appTargetUUID = Object.entries(project.pbxNativeTargetSection()).find(
        ([key, entry]) => !key.endsWith('_comment') && entry === appTarget
      )?.[0];
      const appGroupUUID = Object.entries(project.hash.project.objects.PBXGroup).find(
        ([key, entry]) => !key.endsWith('_comment') && entry === appGroup
      )?.[0];
      const fileReferences = project.pbxFileReferenceSection();
      const siriFileExists = Object.values(fileReferences).some(
        (entry) => entry && typeof entry === 'object' && String(entry.path || entry.name || '').includes(SIRI_INTENTS_FILE)
      );
      if (!siriFileExists) {
        if (!appTargetUUID || !appGroupUUID) {
          throw new Error('FEDEO-App-Target für Siri App Intents wurde nicht gefunden.');
        }
        project.addSourceFile(
          `FEDEO/${SIRI_INTENTS_FILE}`,
          { target: appTargetUUID },
          appGroupUUID
        );
      }

      const controllerPath = path.join(
        modConfig.modRequest.platformProjectRoot,
        SHARE_EXTENSION_DIRECTORY,
        'ShareViewController.swift'
      );

      let source = fs.readFileSync(controllerPath, 'utf8');

      source = replaceOnce(
        source,
        '  var sharedText: [String] = []\n',
        '  var sharedText: [String] = []\n  var processedMediaAttachmentCount = 0\n',
        'den Attachment-Zähler'
      );

      const imageCompletion = `          // If this is the last item, save imagesData in userDefaults and redirect to host app
          if index == (content.attachments?.count)! - 1 {
            let userDefaults = UserDefaults(suiteName: self.hostAppGroupIdentifier)
            userDefaults?.set(self.toData(data: self.sharedMedia), forKey: self.sharedKey)
            userDefaults?.synchronize()
            self.redirectToHostApp(type: .media)
          }`;

      source = replaceOnce(
        source,
        imageCompletion,
        '          self.finishMediaAttachment(content: content, type: .media)',
        'den Abschluss der Bildverarbeitung'
      );

      source = replaceOnce(
        source,
        imageCompletion,
        '          self.finishMediaAttachment(content: content, type: .media)',
        'den Abschluss der Videoverarbeitung'
      );

      const fileCompletion = `    if index == (content.attachments?.count)! - 1 {
      let userDefaults = UserDefaults(suiteName: self.hostAppGroupIdentifier)
      userDefaults?.set(self.toData(data: self.sharedMedia), forKey: self.sharedKey)
      userDefaults?.synchronize()
      self.redirectToHostApp(type: .file)
    }`;

      source = replaceOnce(
        source,
        fileCompletion,
        '    self.finishMediaAttachment(content: content, type: .file)',
        'den Abschluss der Dateiverarbeitung'
      );

      const redirectMethod = '  private func redirectToHostApp(type: RedirectType) {';
      const completionMethod = `  private func finishMediaAttachment(content: NSExtensionItem, type: RedirectType) {
    processedMediaAttachmentCount += 1
    let expectedMediaAttachmentCount = content.attachments?.filter { attachment in
      attachment.hasItemConformingToTypeIdentifier(imageContentType)
        || attachment.hasItemConformingToTypeIdentifier(videoContentType)
        || attachment.hasItemConformingToTypeIdentifier(vcardContentType)
        || attachment.hasItemConformingToTypeIdentifier(fileURLType)
        || attachment.hasItemConformingToTypeIdentifier(pkpassContentType)
        || attachment.hasItemConformingToTypeIdentifier(pdfContentType)
    }.count ?? 0
    guard processedMediaAttachmentCount == expectedMediaAttachmentCount else { return }

    let userDefaults = UserDefaults(suiteName: hostAppGroupIdentifier)
    userDefaults?.set(toData(data: sharedMedia), forKey: sharedKey)
    userDefaults?.synchronize()
    redirectToHostApp(type: type)
  }

`;

      source = replaceOnce(
        source,
        redirectMethod,
        completionMethod + redirectMethod,
        'die Weiterleitungsmethode'
      );

      fs.writeFileSync(controllerPath, source);
    return modConfig;
  });
};