import 'package:rest_let/restlet.dart';
import 'dart:io';
import 'dart:convert';
import 'dart:async';

void main() {

  RestLet r = new RestLet();

  r.get("/hello/:name/:male")
    .listen((ResourceEvent e){
      var request = e.request;

      print("Request on");
      print(request.method);
      print(request.httpRequest.uri.path);

      var routeMatch = e.match;
      var name = routeMatch["name"];
      var male = routeMatch["male"];

      request.restResponse
        ..statusCode = 200
        ..contentTypeTextPlain()
        ..httpResponse
          .write("Hello to ${(male == "1"?"Mr.":"Ms.")} ${name}")
        ..send();
    });

  r.post("/book")
    .listen((ResourceEvent e){
      var request = e.request;
      var response = request.restResponse;

      print("Request on");
      print(request.method);
      print(request.httpRequest.uri.path);

      if (request.body == null || !request.body.containsKey('bookName')) {
        response.statusCode = 403;
        response['data'] = {'error':'Wrong request!','solution':'Please send me a bookName'};
        response.send();
        return;
      }

      print(JSON.encode(request.body));

      getBookDatas(request.body['bookName'])
      .then((datas){
        response.statusCode = 200;
        response['datas'] = {'book':datas};
        response.send();
      })
      .catchError((err){
        print("Error!");
        print(err);
        response.statusCode = 500;
        response['datas'] = {'book':null};
        response.send();
      });
    });

  r.post("/hello")
    .listen((ResourceEvent e){
      var request = e.request;
      print("Request on");
      print(request.method);
      print(request.httpRequest.uri.path);

      var response = request.restResponse;
      response['data'] = request.body;
      response
        ..statusCode = 200
        ..contentTypeApplicationJson()
        ..send();
    });

  r.serve(InternetAddress.LOOPBACK_IP_V4, 4444);
}

Future<Map<String,dynamic>> getBookDatas(String name) {
    var uri = new Uri.https("www.googleapis.com", "/books/v1/volumes",{"q":name});
    print(uri.toString());

    var client = new HttpClient();
    return client.getUrl(uri)
        .then((HttpClientRequest req) => req.close())
          .then((HttpClientResponse resp) => UTF8.decodeStream(resp))
            .then((data) => processJSON(data));
}

Map<String,dynamic> processJSON(String data) {
  var jsonData = JSON.decode(data);
  if (jsonData.containsKey('items')) {
    var item = jsonData['items'][0];
    var bookDatas = {
      'title':item['volumeInfo']['title'],
      'authors':item['volumeInfo']['authors'],
      'desc':item['volumeInfo']['description'],
      'ids':item['volumeInfo']['industryIdentifiers'],
      'rating':item['volumeInfo']['averageRating']
    };
    return bookDatas;
  } else {
    return {'notfound':true};
  }  
}