using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using System.Text.Encodings.Web;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Wabbajack.DTOs.JsonConverters;
using Wabbajack.Server.DataLayer;
using Wabbajack.Server.DTOs;
using Wabbajack.Server.Services;

namespace Wabbajack.BuildServer;

public class ApiKeyAuthenticationOptions : AuthenticationSchemeOptions
{
    public const string DefaultScheme = "API Key";
    public string AuthenticationType = DefaultScheme;
    public string Scheme => DefaultScheme;
}

public class ApiKeyAuthenticationHandler : AuthenticationHandler<ApiKeyAuthenticationOptions>
{
    private const string ProblemDetailsContentType = "application/problem+json";
    public const string ApiKeyHeaderName = "X-Api-Key";
    private readonly DTOSerializer _dtos;
    private readonly AppSettings _settings;
    private readonly SqlService _sql;

    private readonly MetricsKeyCache _keyCache;

    public ApiKeyAuthenticationHandler(
        IOptionsMonitor<ApiKeyAuthenticationOptions> options,
        ILoggerFactory logger,
        UrlEncoder encoder,
        ISystemClock clock,
        MetricsKeyCache keyCache,
        DTOSerializer dtos,
        AppSettings settings,
        SqlService db) : base(options, logger, encoder, clock)
    {
        _sql = db;
        _dtos = dtos;
        _keyCache = keyCache;
        _settings = settings;
    }

    protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
    {
        var metricsKey = Request.Headers[_settings.MetricsKeyHeader].FirstOrDefault();
        // Never needed this, disabled for now
        //await LogRequest(metricsKey);
        if (metricsKey != default)
        {
            await _keyCache.AddKey(metricsKey);
            if (await _sql.IsTarKey(metricsKey))
            {
                await _sql.IngestMetric(new Metric
                {
                    Action = "TarKey",
                    Subject = "Auth",
                    MetricsKey = metricsKey,
                    Timestamp = DateTime.UtcNow
                });
                await Task.Delay(TimeSpan.FromSeconds(60));
                throw new Exception("Error, lipsum timeout of the cross distant cloud.");
            }
        }

        var authorKey = Request.Headers[ApiKeyHeaderName].FirstOrDefault();

        if (authorKey == null)
            Request.Cookies.TryGetValue(ApiKeyHeaderName, out authorKey);


        if (authorKey == null && metricsKey == null) return AuthenticateResult.NoResult();


        if (authorKey != null)
        {
            var owner = await _sql.LoginByApiKey(authorKey);
            if (owner == null)
                return AuthenticateResult.Fail("Invalid author key");

            var claims = new List<Claim> {new(ClaimTypes.Name, owner)};

            claims.Add(new Claim(ClaimTypes.Role, "Author"));
            claims.Add(new Claim(ClaimTypes.Role, "User"));

            var identity = new ClaimsIdentity(claims, Options.AuthenticationType);
            var identities = new List<ClaimsIdentity> {identity};
            var principal = new ClaimsPrincipal(identities);
            var ticket = new AuthenticationTicket(principal, Options.Scheme);

            return AuthenticateResult.Success(ticket);
        }


        if (!await _keyCache.IsValidKey(metricsKey))
        {
            return AuthenticateResult.Fail("Invalid Metrics Key");
        }

        {
            var claims = new List<Claim> {new(ClaimTypes.Role, "User")};


            var identity = new ClaimsIdentity(claims, Options.AuthenticationType);
            var identities = new List<ClaimsIdentity> {identity};
            var principal = new ClaimsPrincipal(identities);
            var ticket = new AuthenticationTicket(principal, Options.Scheme);

            return AuthenticateResult.Success(ticket);
        }
    }

    protected override async Task HandleChallengeAsync(AuthenticationProperties properties)
    {
        Response.StatusCode = 401;
        Response.ContentType = ProblemDetailsContentType;
        await Response.WriteAsync("Unauthorized");
    }

    protected override async Task HandleForbiddenAsync(AuthenticationProperties properties)
    {
        Response.StatusCode = 403;
        Response.ContentType = ProblemDetailsContentType;
        await Response.WriteAsync("forbidden");
    }
}

public static class ApiKeyAuthorizationHandlerExtensions
{
    public static AuthenticationBuilder AddApiKeySupport(this AuthenticationBuilder authenticationBuilder,
        Action<ApiKeyAuthenticationOptions> options)
    {
        return authenticationBuilder.AddScheme<ApiKeyAuthenticationOptions, ApiKeyAuthenticationHandler>(
            ApiKeyAuthenticationOptions.DefaultScheme, options);
    }
}