using RestSharp;
using SimpleJson;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Chapter5
{
    class Ongkir
    {
        public static List<string> GetKotaList()
        {
            List<string> returnList = new List<string>();
            var client = new RestClient("https://api.rajaongkir.com/starter/city");
            var request = new RestRequest(Method.GET);
            request.AddHeader("key", "c31a7ac4eaed9d6d966f5af4cf2aa4b9");
            IRestResponse response = client.Execute(request);
            JsonObject rajaObj = (JsonObject)SimpleJson.SimpleJson.DeserializeObject(response.Content);
            JsonObject contentObj = (JsonObject)rajaObj["rajaongkir"];
            JsonArray cityArray = (JsonArray)contentObj["results"];
            foreach(JsonObject city in cityArray)
            {
                returnList.Add((string) city["city_name"]);
            }
            return returnList;
        }

        public static List<string> GetLayananList (int idAsal, int idTujuan, int berat, string kurir)
        {
            List<string> returnList = new List<string>();
            var client = new RestClient("https://api.rajaongkir.com/starter/cost");
            var request = new RestRequest(Method.POST);
            request.AddHeader("content-type", "application/x-www-form-urlencoded");
            request.AddHeader("key", "c31a7ac4eaed9d6d966f5af4cf2aa4b9");
            request.AddParameter("application/x-www-form-urlencoded",
                $"origin={idAsal.ToString()}&destination={idTujuan.ToString()}" +
                $"&weight={berat.ToString()}&courier={kurir}", ParameterType.RequestBody);
            IRestResponse response = client.Execute(request);
            JsonObject obj = (JsonObject)SimpleJson.SimpleJson.DeserializeObject(response.Content);
            JsonObject rajaObj = (JsonObject)obj["rajaongkir"];
            JsonArray resultsArray = (JsonArray)rajaObj["results"];
            JsonObject courierInfo = (JsonObject)resultsArray[0];
            JsonArray servicesArray = (JsonArray)courierInfo["costs"];
            foreach(JsonObject service in servicesArray)
            {
                string layanan = (string)courierInfo["name"];
                layanan += "-" + (string)service["service"];
                JsonArray detail = (JsonArray)service["cost"];
                JsonObject infoService = (JsonObject)detail[0];
                layanan += " Rp" + (infoService["value"]).ToString();
                layanan += " " + (string)infoService["etd"] + "Hari";
                returnList.Add(layanan);
            }
            return returnList;
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Chapter5
{
    public partial class Form1 : Form
    {
        List<string> listKota = new List<string>();   
        public Form1()
        {
            InitializeComponent();
            listKota = Ongkir.GetKotaList();
            foreach(string kota in listKota)
            {
                tbAsal.AutoCompleteCustomSource.Add(kota);
                tbTujuan.AutoCompleteCustomSource.Add(kota);
            }
        }

        private void TampilkanDaftar(List<string> daftar)
        {
            lblDaftarLayanan.Text = "";
            foreach(string item in daftar)
            {
                lblDaftarLayanan.Text += "- " + item + Environment.NewLine;
            }
        }

        private int GetIdKota(string kota)
        {
            return listKota.IndexOf(kota)+1;
        }

        private void btnCekHarga_Click(object sender, EventArgs e)
        {
            if(tbAsal.Text != "" || tbTujuan.Text != "" || tbBerat.Text != "")
            {
                string kurir = "";
                if (rbJne.Checked)
                    kurir = "jne";
                else if (rbPos.Checked)
                    kurir = "pos";
                else if (rbTiki.Checked)
                    kurir = "tiki";
                List<string> daftarLayanan = Ongkir.GetLayananList
                    (GetIdKota(tbAsal.Text), GetIdKota(tbTujuan.Text), int.Parse(tbBerat.Text), kurir);
                TampilkanDaftar(daftarLayanan);
            }
        }
    }
}