import 'dart:io';
import 'package:flutter/foundation.dart';

import 'package:advance_pdf_viewer/advance_pdf_viewer.dart';
import 'package:decpisos/funcoes_gerais.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:path_provider/path_provider.dart';
import 'package:share/share.dart';

class PDFViewerScreenController extends GetxController{
  var loading = true.obs;
  var loadPDF = false.obs;
  var visibleRefresh = false.obs;
  var error = false.obs;
  PDFDocument doc;
  File _filePDF;

  @override
  void onInit() {
    super.onInit();
    this._loadPDF();
  }

  Future<void> _loadPDF() async {
    var file = await this._createFileOfPdfUrl();
    if(file != null && await file.exists()){
      this.doc = await PDFDocument.fromFile(file);
      //this.visibleRefresh.value = true;
    } 
    else{
      if(await FuncoesGerais.checkInternetConnection() == false){
        this.error.value = true;
      }
      else{
        this.doc = await PDFDocument.fromURL(FuncoesGerais.urlPDF);
      }
      
    }  
    
    this.loading.value = false;
  }

  Future<void> refreshPDF() async {
    this.loading.value = true;
    try {
      await this._filePDF.delete();
      this._loadPDF();
    } catch (e) {
      Get.rawSnackbar(message: 'Não possível atualizar o PDF. Tente novamente');
      this.loading.value = false;
    }
  }

  Future<void> sharePDF() async {
    //Share.shareFiles(['${directory.path}/image.jpg'], text: 'Great picture');
    this.loadPDF.value = true;
    var file = await this._createFileOfPdfUrl();
    try {
      Share.shareFiles([file.path], text: 'DecCard').then((value) => this.loadPDF.value = false);      
    } catch (e) {
      this.loadPDF.value = false;
      Get.rawSnackbar(message: 'Não foi possível compartilhar o PDF');
    }
    
  }  

  Future<File> _createFileOfPdfUrl() async {
    final url = FuncoesGerais.urlPDF;
    File file;
    
    final filename = url.substring(url.lastIndexOf("/") + 1);
    String dir = (await getApplicationDocumentsDirectory()).path;
    file = new File('$dir/$filename');
    if(!await file.exists()){
      if(await FuncoesGerais.checkInternetConnection()){    
        var request = await HttpClient().getUrl(Uri.parse(url));
        var response = await request.close();
        var bytes = await consolidateHttpClientResponseBytes(response);
        await file.writeAsBytes(bytes);
      }
      else{
        file = null;
      }      
    }
    this._filePDF = file;
    if(this._filePDF != null) this.visibleRefresh.value = await this._filePDF.exists();

    return file;
  }  

  Widget buildError(){
    return Container(
      width: double.maxFinite,
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [
          Text('Não foi possível carregar o PDF'),
          SizedBox(height: 10.0,),
          RaisedButton(onPressed: this.refreshPDF,child: Text('Atualizar'),)
        ],
      ),
    );
  }
}