using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Prometheus;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text.Json;
using System.Linq;

namespace PrometheusExporterEdenic
{
    public class Device
    {
        public string id { get; set; }
        public string name { get; set; }
        public string label { get; set; }
        // Add other properties as needed
    }
    public class ApiClient
    {
        private readonly HttpClient _client;
        private readonly string _authToken;
        private readonly string _orgid;
        private readonly string _apimainurl = "https://api.edenic.io/api/v1";
        private string _devicename;
        public string DeviceId { get; private set; }
        public int ph { get; private set; }
        public int temperature { get; private set; }
        public int ec { get; private set; }
        
        public async Task InitializeAsync()
        {
            DeviceId = await GetDeviceIdByName(_devicename);
        }

        public ApiClient(string authToken, string orgID, string devicename)
        {
            _client = new HttpClient();
            _authToken = authToken;
            _orgid = orgID;
            _devicename = devicename;
            _client.DefaultRequestHeaders.Authorization = 
                new AuthenticationHeaderValue(_authToken);
        }

        public async Task<dynamic> MakeApiRequest<T>(string path)
        {
            try
            {
                HttpResponseMessage response = await _client.GetAsync($"{_apimainurl}{path}");
                Console.WriteLine($"Request send to: {_apimainurl}{path}");
                
                if (response.IsSuccessStatusCode)
                {
                    string content = await response.Content.ReadAsStringAsync();
                    return JsonSerializer.Deserialize<dynamic>(content); }
                else
                {
                    throw new HttpRequestException($"Error: {response.StatusCode}");
                }
            }
            catch (HttpRequestException e)
            {
                Console.WriteLine($"Request exception: {e.Message}");
                throw;
            }
            catch (JsonException e)
            {
                Console.WriteLine($"JSON parsing exception: {e.Message}");
                throw;
            }
        }

        public async Task<string> GetDeviceIdByName(string name)
        {
            try
            {
                dynamic result = await MakeApiRequest<object>($"/device/{_orgid}");
                string jsonString = result.ToString(); // Convert dynamic to string
                Console.WriteLine($"Raw JSON: {jsonString}"); // Debug output

                var devices = JsonSerializer.Deserialize<List<Device>>(jsonString);
                Console.WriteLine($"Deserialized {devices.Count} devices"); // Debug output

                var targetDevice = devices.FirstOrDefault(d => d.label == name);
                if (targetDevice != null)
                {
                    Console.WriteLine($"Found device: {targetDevice.label}, ID: {targetDevice.id}"); // Debug output
                    return targetDevice.id;
                }
                else
                {
                    Console.WriteLine($"No device found with label: {name}"); // Debug output
                    return null;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error in GetDeviceIdByName: {ex.Message}"); // Debug output
                return null;
            }
        }
        public async Task GetTelemetry()
        {
            try
            {
                dynamic result = await MakeApiRequest<object>($"/telemetry/{DeviceId}");
                string jsonString = result.ToString();
                Console.WriteLine($"Raw JSON: {jsonString}"); // Debug output

                using (JsonDocument doc = JsonDocument.Parse(jsonString))
                {
                    JsonElement root = doc.RootElement;

                    ph = ExtractValue(root, "ph");
                    temperature = ExtractValue(root, "temperature");
                    ec = ExtractValue(root, "electrical_conductivity");

                    Console.WriteLine($"Extracted values - pH: {ph/100.0}, Temperature: {temperature/100.0}, EC: {ec/100.0}");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error in GetTelemetry: {ex.Message}");
            }
        }

        private int ExtractValue(JsonElement root, string key)
        {
            if (root.TryGetProperty(key, out JsonElement property) &&
                property.GetArrayLength() > 0 &&
                property[0].TryGetProperty("value", out JsonElement valueElement))
            {
                string valueString = valueElement.GetString();
                if (!string.IsNullOrEmpty(valueString))
                {
                    if (float.TryParse(valueString, out float floatValue))
                    {
                        return (int)(floatValue * 100); // Convert to int, preserving two decimal places
                    }
                    else
                    {
                        Console.WriteLine($"Error: Unable to parse {key} value: {valueString}");
                    }
                }
                else
                {
                    Console.WriteLine($"Error: {key} value is empty");
                }
            }
            else
            {
                Console.WriteLine($"Error: {key} not found or invalid");
            }
            return 0; // Default value
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }

    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseMetricServer();
            app.UseHttpMetrics();

            app.UseRouting();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapGet("/", async context =>
                {
                    await context.Response.WriteAsync("Open /metrics");
                });
            });

            var ph = Metrics.CreateGauge("edenic_ph", "Edenic ph");
            var temperature = Metrics.CreateGauge("edenic_temperature", "Edenic temperature");
            var ec = Metrics.CreateGauge("edenic_ec", "Edenic EC");

            string EDENIC_API_TOKEN = Environment.GetEnvironmentVariable("EDENIC_API_TOKEN");
            string EDENIC_ORG_ID = Environment.GetEnvironmentVariable("EDENIC_ORG_ID");
            string EDENIC_DEVICENAME = Environment.GetEnvironmentVariable("EDENIC_DEVICENAME");
            ApiClient client = new ApiClient(EDENIC_API_TOKEN, EDENIC_ORG_ID, EDENIC_DEVICENAME);

            Task.Run(async () =>
            {
                await client.InitializeAsync();
                Console.WriteLine($"Device ID: {client.DeviceId}");
                while (true)
                {
                    await client.GetTelemetry();
                    ph.Set(client.ph / 100.0);  // Convert back to float
                    temperature.Set(client.temperature / 100.0);  // Convert back to float
                    ec.Set(client.ec / 100.0);  // Convert back to float
                    await Task.Delay(15000);
                }
            });
        }
    }
}