using System;
using System.Net.Http;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;

namespace FrameworkBLL.Entitlement
{
    public class EntitlementGateClient : IEntitlementGateClient
    {
        private readonly IHttpClientFactory _HttpClientFactory;
        private readonly ILogger<EntitlementGateClient> _Logger;

        public EntitlementGateClient(IHttpClientFactory httpClientFactory, ILogger<EntitlementGateClient> logger)
        {
            _HttpClientFactory = httpClientFactory;
            _Logger = logger;
        }

        public async Task<bool> IsFeatureEnabledAsync(int clientId, int userId, string featureCode, CancellationToken ct = default)
        {
            try
            {
                var client = _HttpClientFactory.CreateClient("entitlement-internal");
                var url = $"lic/Entitlement.svc/IsFeatureEnabled?ClientId={clientId}&UserId={userId}&FeatureCode={Uri.EscapeDataString(featureCode)}";

                using var response = await client.GetAsync(url, ct).ConfigureAwait(false);
                if (!response.IsSuccessStatusCode)
                {
                    _Logger.LogWarning(
                        "Entitlement check HTTP {StatusCode} for FeatureCode {FeatureCode} — failing open.",
                        (int)response.StatusCode, featureCode);
                    return true;
                }

                var json = await response.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
                using var doc = JsonDocument.Parse(json);
                if (doc.RootElement.TryGetProperty("Body", out var bodyElement) &&
                    bodyElement.ValueKind is JsonValueKind.True or JsonValueKind.False)
                {
                    return bodyElement.GetBoolean();
                }

                _Logger.LogWarning(
                    "Entitlement check returned an unexpected response shape for FeatureCode {FeatureCode} — failing open.", featureCode);
                return true;
            }
            catch (Exception ex)
            {
                // Fail open: an unreachable Entitlement service must not hide an entire
                // Standard portlet-type/dashboard list from every client.
                _Logger.LogError(ex, "Entitlement check failed for FeatureCode {FeatureCode}, ClientId {ClientId} — failing open.", featureCode, clientId);
                return true;
            }
        }
    }
}