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1using System;
2using System.Net.Http;
3using System.Threading.Tasks;
4using Microsoft.AspNetCore.Mvc.RazorPages;
5using System.IO;
6using Newtonsoft.Json.Linq;
7
8namespace WeatherApp.Pages
9{
10    public class IndexModel : PageModel
11    {
12        // URL where i call the API
13        private string _url = "http://api.weatherapi.com/v1/current.json?key=";
14        //Information class about the weather
15        public Information Info { get; private init; }
16        //Location class about the weather
17        public Location Location { get; private set; }
18        
19        //String where's the response JSON sent by API
20        private string _result = "";
21
22        public IndexModel()
23        {
24            Info = new Information();
25            string key;
26            
27            /*
28             * Take the API key:
29             *  - If there's the file (localhost) it take the key from the file
30             *  - If there isn't the file (Server) it the the key from Environment variable
31             */
32            try
33            {
34                var read = new StreamReader("API.txt");
35                key = read.ReadLine();
36            }
37            catch (Exception)
38            {
39                key = Environment.GetEnvironmentVariable("ApiKey");
40            }
41
42            _url += key;
43        }
44        
45        public async Task OnPostSearch(string city)
46        {
47            //Call the API and take the JSON
48            using (var req = new HttpClient())
49            {
50                _url += $"&q={city}&aqi=no";
51                try
52                {
53                    _result = await req.GetStringAsync(_url);
54                }
55                catch (HttpRequestException)
56                {
57                    Info.Text = "Please insert a valid city";
58                    return;
59                }
60                catch (Exception)
61                {
62                    Info.Text = "Error!";
63                    return;
64                }
65            }
66
67            //Deserializing JSON and taking the information that are stored in the class
68            var deserialized = JObject.Parse(_result);
69            try
70            {
71                Info.TempC = deserialized["current"]?["temp_c"]?.ToObject<double>();
72                Info.Text = deserialized["current"]?["condition"]?["text"]?.ToString();
73                Info.Icon = deserialized["current"]?["condition"]?["icon"]?.ToString();
74                Location = deserialized["location"]?.ToObject<Location>();
75            }
76            catch (NullReferenceException)
77            {
78                RedirectToPage("Index");
79            }
80            catch (InvalidOperationException)
81            {
82                RedirectToPage("Index");
83            }
84        }
85    }
86
87    //Class information where there's the weather information
88    public class Information
89    {
90        public string Text { get; set; }
91        public string Icon { get; set; }
92        public double? TempC { get; set; }
93    }
94
95    //Class location where there's the location chosen by the user
96    public class Location
97    {
98        public Location(string name, string region, string country)
99        {
100            Name = name;
101            Region = region;
102            Country = country;
103        }
104
105        private string Name { get; set; }
106        private string Region { get; set; }
107        private string Country { get; set; }
108
109        public override string ToString()
110        {
111            return $"{Name}, {Region}, {Country}";
112        }
113    }
114}