using System.Diagnostics.CodeAnalysis;
using System.Text.Json;
using Microsoft.Extensions.Options;
using Microsoft.Net.Http.Headers;
using MoonlightServers.Daemon.Configuration;
using MoonlightServers.DaemonShared.Http;

namespace MoonlightServers.Daemon.Services;

public class RemoteService
{
    private readonly IOptions<RemoteOptions> Options;
    private readonly ILogger<RemoteService> Logger;
    private readonly IHttpClientFactory ClientFactory;

    public RemoteService(
        IOptions<RemoteOptions> options,
        IHttpClientFactory clientFactory,
        ILogger<RemoteService> logger
    )
    {
        Options = options;
        ClientFactory = clientFactory;
        Logger = logger;
    }

    public async Task<int> CheckReachabilityAsync()
    {
        try
        {
            var client = ClientFactory.CreateClient();

            var request = CreateBaseRequest(HttpMethod.Get, "api/remote/servers/nodes/ping");
            var response = await client.SendAsync(request);

            return (int)response.StatusCode;
        }
        catch (Exception e)
        {
            Logger.LogTrace(e, "An error occured while checking if remote is reachable");
            return 0;
        }
    }
    
    private HttpRequestMessage CreateBaseRequest(
        [StringSyntax(StringSyntaxAttribute.Uri)]
        HttpMethod method,
        string endpoint
    )
    {
        var request = new HttpRequestMessage();

        request.Headers.Add(HeaderNames.Authorization, $"{Options.Value.TokenId} {Options.Value.Token}");
        request.RequestUri = new Uri(new Uri(Options.Value.EndpointUrl), endpoint);
        request.Method = method;

        return request;
    }
    
    private async Task EnsureSuccessAsync(HttpResponseMessage message)
    {
        if (message.IsSuccessStatusCode)
            return;

        try
        {
            var problemDetails = await message.Content.ReadFromJsonAsync<ProblemDetails>(
                SerializationContext.Default.Options
            );

            if (problemDetails == null)
            {
                // If we cant handle problem details, we handle it natively
                message.EnsureSuccessStatusCode();
                return;
            }

            // Parse into exception
            throw new RemoteException(
                problemDetails.Type,
                problemDetails.Title,
                problemDetails.Status,
                problemDetails.Detail,
                problemDetails.Errors
            );
        }
        catch (JsonException)
        {
            // If we cant handle problem details, we handle it natively
            message.EnsureSuccessStatusCode();
        }
    }
}

public class RemoteException : Exception
{
    public string Type { get; }
    public string Title { get; }
    public int Status { get; }
    public string? Detail { get; }
    public Dictionary<string, string[]>? Errors { get; }

    public RemoteException(
        string type,
        string title,
        int status,
        string? detail = null,
        Dictionary<string, string[]>? errors = null)
        : base(detail ?? title)
    {
        Type = type;
        Title = title;
        Status = status;
        Detail = detail;
        Errors = errors;
    }
}