import 'dart:async';
import 'dart:io';

import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_sharing_intent/flutter_sharing_intent.dart';
import 'package:flutter_sharing_intent/model/sharing_file.dart';
import 'package:flutter_translate/flutter_translate.dart';
import 'package:logger/logger.dart';
import 'package:path/path.dart';

import '../../locator.dart';
import '../enums/error_code.dart';
import '../enums/refresh_event.dart';
import '../enums/viewstate.dart';
import '../error/rest_service_exception.dart';
import '../error/service_exception.dart';
import '../models/rest/rest_error.dart';
import '../models/rest/uploaded_multi_response.dart';
import '../models/rest/uploaded_response.dart';
import '../services/file_service.dart';
import '../services/link_service.dart';
import '../services/refresh_service.dart';
import '../util/logger.dart';
import '../util/paste_util.dart';
import 'base_model.dart';

class UploadModel extends BaseModel {
  final Logger _logger = getLogger();
  final FileService _fileService = locator<FileService>();
  final LinkService _linkService = locator<LinkService>();
  final RefreshService _refreshService = locator<RefreshService>();

  final TextEditingController _pasteTextController = TextEditingController();
  bool pasteTextTouched = false;

  late StreamSubscription _intentDataStreamSubscription;

  bool createMulti = false;
  String? fileName;
  List<PlatformFile>? paths;
  String? _extension;
  bool loadingPath = false;
  String? errorMessage;

  TextEditingController get pasteTextController => _pasteTextController;

  void _parseIntentFiles(List<SharedFile> files) {
    if (files.isNotEmpty) {
      setStateView(ViewState.busy);

      paths = files.map((sharedFile) {
        _logger.d("Shared file name: ${basename(sharedFile.value ?? '')}");
        _logger.d("Shared file path: ${sharedFile.value}");
        _logger.d(
            "Shared file size: ${File(sharedFile.value ?? '').lengthSync()}");
        _logger.d("Shared file type: ${sharedFile.type}");
        return PlatformFile.fromMap({
          'path': sharedFile.value,
          'name': basename(sharedFile.value!),
          'size': File(sharedFile.value!).lengthSync(),
          'bytes': null
        });
      }).toList();

      setStateView(ViewState.idle);
    }
  }

  void deleteIntentFile(String path) {
    setStateView(ViewState.busy);
    _logger.d("Removing path '$path' from $paths");

    paths?.removeWhere((element) => element.path == path);

    int length = paths!.length;
    if (length == 0) {
      paths = null;
    }
    setStateView(ViewState.idle);
  }

  void init() {
    _pasteTextController.addListener(() {
      pasteTextTouched = pasteTextController.text.isNotEmpty;
      setStateBoolValue("PASTE_TEXT_TOUCHED", pasteTextTouched);
    });

    // For sharing images coming from outside the app while the app is in the memory
    _intentDataStreamSubscription = FlutterSharingIntent.instance
        .getMediaStream()
        .listen((List<SharedFile> value) {
      _logger.d("Retrieved ${value.length} files from intent");
      _parseIntentFiles(value);
    }, onError: (err) {
      _errorIntentHandle(err);
    });

    // For sharing images coming from outside the app while the app is closed
    FlutterSharingIntent.instance
        .getInitialSharing()
        .then((List<SharedFile> value) {
      _logger.d("Retrieved ${value.length} files from inactive intent");
      _parseIntentFiles(value);
    });
  }

  void _errorIntentHandle(err) {
    setStateView(ViewState.busy);
    errorMessage = translate('upload.retrieval_intent');
    _logger.e('Error while retrieving shared data: $err');
    setStateView(ViewState.idle);
  }

  String? generatePasteLinks(Map<String, bool>? uploads, String url) {
    if (uploads != null && uploads.isNotEmpty) {
      var links = '';

      uploads.forEach((id, isMulti) {
        if (isMulti && createMulti || !isMulti && !createMulti) {
          links += '${PasteUtil.generateLink(url, id)}\n';
        }
      });

      return links;
    }

    return null;
  }

  void toggleCreateMulti() {
    setStateView(ViewState.busy);
    createMulti = !createMulti;
    setStateView(ViewState.idle);
  }

  void openFileExplorer() async {
    setStateView(ViewState.busy);
    setStateMessage(translate('upload.file_explorer_open'));
    loadingPath = true;

    try {
      paths = (await FilePicker.platform.pickFiles(
        type: FileType.any,
        allowMultiple: true,
        withData: false,
        withReadStream: true,
        allowedExtensions: (_extension?.isNotEmpty ?? false)
            ? _extension?.replaceAll(' ', '').split(',')
            : null,
      ))
          ?.files;
    } on PlatformException catch (e) {
      _logger.e('Unsupported operation', error: e);
    } catch (ex) {
      _logger.e('An unknown error occurred', error: ex);
    }

    loadingPath = false;
    fileName = paths != null ? paths!.map((e) => e.name).toString() : '...';

    setStateMessage(null);
    setStateView(ViewState.idle);
  }

  void clearCachedFiles() async {
    setStateView(ViewState.busy);
    await FilePicker.platform.clearTemporaryFiles();
    paths = null;
    fileName = null;
    errorMessage = null;
    setStateView(ViewState.idle);
  }

  Future<Map<String, bool>?> upload() async {
    setStateView(ViewState.busy);
    setStateMessage(translate('upload.uploading_now'));

    Map<String, bool> uploadedPasteIds = {};
    try {
      List<File>? files;
      Map<String, String>? additionalFiles;

      if (pasteTextController.text.isNotEmpty) {
        additionalFiles = Map.from({
          'paste-${(DateTime.now().millisecondsSinceEpoch / 1000).round()}.txt':
              pasteTextController.text
        });
      }

      if (paths != null && paths!.isNotEmpty) {
        files = paths!.map((e) => File(e.path!)).toList();
      }

      UploadedResponse response =
          await _fileService.uploadPaste(files, additionalFiles);
      for (var element in response.data.ids) {
        uploadedPasteIds.putIfAbsent(element, () => false);
      }

      if (createMulti && response.data.ids.length > 1) {
        UploadedMultiResponse multiResponse =
            await _fileService.uploadMultiPaste(response.data.ids);
        uploadedPasteIds.putIfAbsent(multiResponse.data.urlId, () => true);
      }

      clearCachedFiles();
      _pasteTextController.clear();
      _refreshService.addEvent(RefreshEvent.refreshHistory);
      errorMessage = null;
      return uploadedPasteIds;
    } catch (e) {
      if (e is RestServiceException) {
        if (e.statusCode == HttpStatus.notFound) {
          errorMessage = translate('upload.errors.not_found');
        } else if (e.statusCode == HttpStatus.forbidden) {
          errorMessage = translate('api.forbidden');
        } else if (e.statusCode != HttpStatus.notFound &&
            e.statusCode != HttpStatus.forbidden &&
            e.responseBody is RestError &&
            e.responseBody.message != null) {
          if (e.statusCode == HttpStatus.badRequest) {
            errorMessage = translate('api.bad_request',
                args: {'reason': e.responseBody.message});
          } else {
            errorMessage = translate('api.general_rest_error_payload',
                args: {'message': e.responseBody.message});
          }
        } else {
          errorMessage = translate('api.general_rest_error');
        }
      } else if (e is ServiceException && e.code == ErrorCode.socketError) {
        errorMessage = translate('api.socket_error');
      } else if (e is ServiceException && e.code == ErrorCode.socketTimeout) {
        errorMessage = translate('api.socket_timeout');
      } else {
        errorMessage = translate('app.unknown_error');
        setStateMessage(null);
        setStateView(ViewState.idle);
        _logger.e('An unknown error occurred', error: e);
        rethrow;
      }
    }

    setStateMessage(null);
    setStateView(ViewState.idle);
    return null;
  }

  void openLink(String link) {
    _linkService.open(link);
  }

  @override
  void dispose() {
    _pasteTextController.dispose();
    _intentDataStreamSubscription.cancel();
    FlutterSharingIntent.instance.reset();
    paths = null;
    super.dispose();
  }
}