// lib/model/activity/activity_library_bootstrap.dart
import 'dart:io';

import 'package:aves/model/settings/defaults.dart';
import 'package:aves/model/settings/settings.dart';
import 'package:aves/services/common/services.dart';
import 'package:flutter/material.dart';

class ActivityLibraryBootstrap {
  static bool _running = false;

  static Future<void> ensureConfigured(BuildContext context) async {
    if (_running) return;
    _running = true;

    try {
      final existingTreeUri = settings.activityRootTreeUri;

      // Già configurata: non chiedere più nulla.
      // Però proviamo comunque a garantire che esista Activity/main.
      if (existingTreeUri != null && existingTreeUri.isNotEmpty) {
        final mainReady = await storageService.ensureActivityMainDirectory(
          existingTreeUri,
        );

        if (!mainReady && context.mounted) {
          await _showActivityMainCreationFailedDialog(
            context: context,
          );
        }

        return;
      }

      final rootPath = settings.activityRootPath;

      final createdOrExists = await _tryCreateRootDirectory(rootPath);

      if (!context.mounted) return;

      if (createdOrExists) {
        final shouldContinue = await _showActivityRootReadyDialog(
          context: context,
          rootPath: rootPath,
        );

        if (!shouldContinue) {
          settings.activityRootPromptDone = true;
          return;
        }
      } else {
        final understood = await _showActivityRootMissingDialog(
          context: context,
          rootPath: rootPath,
        );

        if (!understood) {
          settings.activityRootPromptDone = true;
          return;
        }

        if (!context.mounted) return;

        final shouldOpenPicker = await _showOpenPickerDialog(
          context: context,
          rootPath: rootPath,
        );

        if (!shouldOpenPicker) {
          settings.activityRootPromptDone = true;
          return;
        }
      }

      if (!context.mounted) return;

      await _pickValidateAndSaveActivityRoot(
        context: context,
        rootPath: rootPath,
      );
    } catch (e, st) {
      debugPrint('[ActivityBootstrap] failed to configure activity library: $e');
      debugPrint('[ActivityBootstrap] stack: $st');
    } finally {
      _running = false;
    }
  }

  static Future<void> _pickValidateAndSaveActivityRoot({
    required BuildContext context,
    required String rootPath,
  }) async {
    while (context.mounted) {
      // Piccola pausa per lasciare chiudere completamente il dialog Flutter
      // prima di aprire il picker Android SAF.
      await Future.delayed(const Duration(milliseconds: 300));

      if (!context.mounted) return;

      final picked = await storageService.pickActivityDirectory();

      if (picked == null || picked.treeUri.isEmpty) {
        settings.activityRootPromptDone = true;
        debugPrint('[ActivityBootstrap] user did not select activity directory');
        return;
      }

      final selectedPath = picked.path;

      debugPrint('[ActivityBootstrap] picked treeUri=${picked.treeUri}');
      debugPrint('[ActivityBootstrap] picked path=$selectedPath');

      if (!_isExpectedActivityRoot(selectedPath, rootPath)) {
        if (!context.mounted) return;

        final retry = await _showWrongActivityRootDialog(
          context: context,
          expectedPath: rootPath,
          selectedPath: selectedPath,
        );

        if (!retry) {
          settings.activityRootPromptDone = true;
          return;
        }

        if (!context.mounted) return;

        final shouldOpenPicker = await _showOpenPickerDialog(
          context: context,
          rootPath: rootPath,
        );

        if (!shouldOpenPicker) {
          settings.activityRootPromptDone = true;
          return;
        }

        continue;
      }

      settings.activityRootPath = rootPath;
      settings.activityRootTreeUri = picked.treeUri;
      settings.activityRootPromptDone = true;

      debugPrint('[ActivityBootstrap] saved activity root path=$rootPath');
      debugPrint('[ActivityBootstrap] saved activity treeUri=${picked.treeUri}');

      final mainReady = await storageService.ensureActivityMainDirectory(
        picked.treeUri,
      );

      debugPrint('[ActivityBootstrap] Activity/main ready=$mainReady');

      if (!mainReady && context.mounted) {
        await _showActivityMainCreationFailedDialog(
          context: context,
        );
      }

      return;
    }
  }

  static Future<bool> _tryCreateRootDirectory(String rootPath) async {
    try {
      final dir = Directory(rootPath);

      if (!await dir.exists()) {
        await dir.create(recursive: true);
        debugPrint('[ActivityBootstrap] attempted to create root directory: $rootPath');
      }

      final existsAfterCreate = await dir.exists();

      if (existsAfterCreate) {
        debugPrint('[ActivityBootstrap] root directory exists: $rootPath');
      } else {
        debugPrint('[ActivityBootstrap] root directory still missing after create attempt: $rootPath');
      }

      return existsAfterCreate;
    } catch (e, st) {
      debugPrint('[ActivityBootstrap] failed to create root directory: $rootPath');
      debugPrint('[ActivityBootstrap] error: $e');
      debugPrint('[ActivityBootstrap] stack: $st');
      return false;
    }
  }

  static String _normalizePath(String path) {
    final trimmed = path.trim();
    return trimmed.endsWith('/') ? trimmed : '$trimmed/';
  }

  static bool _isExpectedActivityRoot(
    String? selectedPath,
    String expectedPath,
  ) {
    if (selectedPath == null || selectedPath.trim().isEmpty) {
      return false;
    }

    return _normalizePath(selectedPath) == _normalizePath(expectedPath);
  }

  static Future<bool> _showActivityRootReadyDialog({
    required BuildContext context,
    required String rootPath,
  }) async {
    final result = await showDialog<bool>(
      context: context,
      barrierDismissible: false,
      builder: (dialogContext) {
        return AlertDialog(
          title: const Text('Cartella attività'),
          content: Text(
            'Aves deve accedere alla cartella:\n\n'
            '$rootPath\n\n'
            'La cartella esiste già o è stata creata correttamente.\n\n'
            'Nella schermata successiva seleziona questa cartella per permettere '
            'ad Aves di scansionare i file FIT, GPX e TCX.\n\n'
            'Dopo il consenso Aves creerà automaticamente anche la sottocartella:\n\n'
            '$rootPath/main',
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(false),
              child: const Text('Più tardi'),
            ),
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(true),
              child: const Text('Continua'),
            ),
          ],
        );
      },
    );

    return result ?? false;
  }

  static Future<bool> _showActivityRootMissingDialog({
    required BuildContext context,
    required String rootPath,
  }) async {
    final result = await showDialog<bool>(
      context: context,
      barrierDismissible: false,
      builder: (dialogContext) {
        return AlertDialog(
          title: const Text('Cartella Activity mancante'),
          content: Text(
            'Aves non è riuscita a creare automaticamente la cartella:\n\n'
            '$rootPath\n\n'
            'Questo può succedere su Android moderno per le limitazioni di accesso '
            'allo storage.\n\n'
            'Ora dovrai creare manualmente la cartella "Activity" nella memoria interna '
            'del dispositivo, oppure selezionarla se esiste già.\n\n'
            'Percorso richiesto:\n'
            '/storage/emulated/0/Activity\n\n'
            'Dopo il consenso Aves proverà a creare automaticamente la sottocartella:\n\n'
            '/storage/emulated/0/Activity/main',
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(false),
              child: const Text('Annulla'),
            ),
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(true),
              child: const Text('OK, ho capito'),
            ),
          ],
        );
      },
    );

    return result ?? false;
  }

  static Future<bool> _showOpenPickerDialog({
    required BuildContext context,
    required String rootPath,
  }) async {
    final result = await showDialog<bool>(
      context: context,
      barrierDismissible: false,
      builder: (dialogContext) {
        return AlertDialog(
          title: const Text('Seleziona cartella Activity'),
          content: Text(
            'Nella schermata successiva seleziona esattamente questa cartella:\n\n'
            '$rootPath\n\n'
            'Se non esiste, creala dal selettore file o da un file manager, poi torna qui '
            'e selezionala.\n\n'
            'Aves userà questa cartella come root della libreria attività.\n\n'
            'Dopo il consenso Aves creerà automaticamente anche:\n\n'
            '$rootPath/main',
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(false),
              child: const Text('Più tardi'),
            ),
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(true),
              child: const Text('Apri selettore cartella'),
            ),
          ],
        );
      },
    );

    return result ?? false;
  }

  static Future<bool> _showWrongActivityRootDialog({
    required BuildContext context,
    required String expectedPath,
    required String? selectedPath,
  }) async {
    final result = await showDialog<bool>(
      context: context,
      barrierDismissible: false,
      builder: (dialogContext) {
        return AlertDialog(
          title: const Text('Cartella non corretta'),
          content: Text(
            'Hai selezionato una cartella diversa da quella richiesta.\n\n'
            'Cartella selezionata:\n'
            '${selectedPath == null || selectedPath.isEmpty ? 'non riconosciuta' : selectedPath}\n\n'
            'Cartella richiesta:\n'
            '$expectedPath\n\n'
            'Devi creare o selezionare esattamente la cartella "Activity" nella memoria interna del dispositivo.\n\n'
            'Non selezionare "Activity/main", "Download", "Documents" o altre cartelle.',
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(false),
              child: const Text('Più tardi'),
            ),
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(true),
              child: const Text('Riprova'),
            ),
          ],
        );
      },
    );

    return result ?? false;
  }

  static Future<void> _showActivityMainCreationFailedDialog({
    required BuildContext context,
  }) async {
    await showDialog<void>(
      context: context,
      barrierDismissible: true,
      builder: (dialogContext) {
        return AlertDialog(
          title: const Text('Sottocartella main non creata'),
          content: Text(
            'Aves ha ottenuto l’accesso alla cartella Activity, ma non è riuscita '
            'a creare automaticamente la sottocartella:\n\n'
            '${SettingsDefaults.activityRootPath}/main\n\n'
            'Puoi crearla manualmente con un file manager.\n\n'
            'La scansione continuerà comunque a funzionare sulla cartella Activity '
            'e sulle sue sottocartelle esistenti.',
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(),
              child: const Text('OK'),
            ),
          ],
        );
      },
    );
  }

  static Future<void> resetConfiguration() async {
    settings.activityRootTreeUri = null;
    settings.activityRootPromptDone = false;
    settings.activityRootPath = SettingsDefaults.activityRootPath;
  }
}