using System;
using System.IO;
using System.Text.Json.Nodes;
using PolyTrader.Web.Configuration;
using Xunit;

namespace PolyTrader.Tests.WebUi
{
    public class WebUiConfigManagerTests : IDisposable
    {
        private readonly string _tempFile;

        public WebUiConfigManagerTests()
        {
            _tempFile = Path.Combine(Path.GetTempPath(), $"appsettings_test_{Guid.NewGuid():N}.json");
        }

        public void Dispose()
        {
            if (File.Exists(_tempFile))
                File.Delete(_tempFile);
        }

        [Fact]
        public void GenerateSecureToken_Returns64CharHexAndIsRandom()
        {
            string t1 = WebUiConfigManager.GenerateSecureToken();
            string t2 = WebUiConfigManager.GenerateSecureToken();

            Assert.NotNull(t1);
            Assert.Equal(64, t1.Length);
            Assert.Matches("^[0-9a-f]{64}$", t1);
            Assert.NotEqual(t1, t2);
        }

        [Fact]
        public void SaveToLocalSettings_CreatesFileAndPreservesExistingSections()
        {
            // Vorhandene Sektion simulieren
            File.WriteAllText(_tempFile, "{\"Database\":{\"Provider\":\"MySql\"}}");

            var options = new WebUiOptions
            {
                Enabled = true,
                Port = 5001,
                LocalOnly = false,
                AuthToken = "test-token-xyz"
            };

            WebUiConfigManager.SaveToLocalSettings(options, _tempFile);

            string content = File.ReadAllText(_tempFile);
            var node = JsonNode.Parse(content)?.AsObject();

            Assert.NotNull(node);
            Assert.Equal("MySql", node["Database"]?["Provider"]?.GetValue<string>());

            var webNode = node["WebUi"]?.AsObject();
            Assert.NotNull(webNode);
            Assert.True(webNode["Enabled"]?.GetValue<bool>());
            Assert.Equal(5001, webNode["Port"]?.GetValue<int>());
            Assert.False(webNode["LocalOnly"]?.GetValue<bool>());
            Assert.Equal("test-token-xyz", webNode["AuthToken"]?.GetValue<string>());
        }

        [Fact]
        public void SaveToLocalSettings_WhenFileDoesNotExist_CreatesNewFile()
        {
            if (File.Exists(_tempFile)) File.Delete(_tempFile);

            var options = new WebUiOptions
            {
                Enabled = true,
                Port = 5050,
                LocalOnly = true,
                AuthToken = "brand-new-token"
            };

            WebUiConfigManager.SaveToLocalSettings(options, _tempFile);

            Assert.True(File.Exists(_tempFile));
            string content = File.ReadAllText(_tempFile);
            var node = JsonNode.Parse(content)?.AsObject();
            Assert.NotNull(node);
            Assert.Equal(5050, node["WebUi"]?["Port"]?.GetValue<int>());
            Assert.Equal("brand-new-token", node["WebUi"]?["AuthToken"]?.GetValue<string>());
        }
    }
}