using Salmon.Core;
using Salmon.Service;
using System.Diagnostics;
using System.Text.Json;

const string ENV_PERIOD = "SALMON_PERIOD";
const string ENV_URI = "SALMON_URI";

Console.WriteLine($"Salmon.Service initializing...");

int? period = null;
Uri? uri = null;
bool? monitor_hardware = null;
bool? monitor_localsoftware = null;

// 1: use environment variable
var period_env = Environment.GetEnvironmentVariable(ENV_PERIOD);
if (period_env != null)
{
    if (int.TryParse(period_env, out int p))
        period = p;
    else
        Console.WriteLine($"Cannot use env variable {ENV_PERIOD}, should be an int in milliseconds.");
}

var uri_env = Environment.GetEnvironmentVariable(ENV_URI);
if(uri_env != null)
{
    if (Uri.TryCreate(uri_env, UriKind.Absolute, out var u))
        uri = u;
    else
        Console.WriteLine($"Cannot use env variable {ENV_URI}, url is malformated.");
}

// 2: override with configuration file
string configpath = "config.json";
if (File.Exists(configpath))
{
    Console.WriteLine("Found a configuration file, parsing...");
    string content = File.ReadAllText(configpath);
    Configuration? conf = null;
    try
    {
        conf = JsonSerializer.Deserialize<Configuration>(content);
    }
    catch(Exception e)
    {
        Console.WriteLine($"Cannot parse config file \"{configpath}\", {e}.");
        return 1;
    }

    if(conf == null)
    {
        Console.WriteLine($"Cannot parse config file \"{configpath}\".");
        return 1;
    }

    if(conf.Url != null)
        uri = conf.Url;

    if(conf.Period != null)
        period = conf.Period;

    if(conf.MonitorHardware != null)
        monitor_hardware = conf.MonitorHardware;    
    
    if(conf.MonitorLocalSoftware != null)
        monitor_localsoftware = conf.MonitorLocalSoftware;
}

//todo: override with parameter

// 3 : override with argument

// 4 : override with default
period ??= 60000;
monitor_hardware ??= true;
monitor_localsoftware ??= true;

// 5 : Check if valid
if(uri == null)
{
    Console.WriteLine($"Cannot start: not any URI defined.");
    return 1;
}



// Initialisation
Transmitter transmitter = new();

Console.WriteLine($"Salmon.Service started at {DateTime.Now}.");


while ( true )
{
    
    var software = Salmon.Model.Monitor.Software.FromLocal();

    List<Element> tosend = new();
    tosend.Add(software);

    if(monitor_hardware == true)
    {
        var hardwares = Salmon.Model.Monitor.Hardware.FromAllHardware();
        tosend.AddRange(hardwares);
    }
    
    try
    {
        await transmitter.SendAsync(uri, tosend);
    }
    catch(HttpRequestException e)
    {
        Console.WriteLine($"[{e.StatusCode}] Sending data failed: {e.Message}.");
    }
    catch(Exception e)
    {
        Console.WriteLine($"Sending data failed: {e}");
    }

    await Task.Delay(period.Value);
}