// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Linq;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Linq;
using Microsoft.AspNetCore.Testing;
using Moq;
using StackExchange.Redis;
using Xunit;
using Xunit.Abstractions;

namespace Microsoft.AspNetCore.DataProtection.StackExchangeRedis;

public class DataProtectionRedisTests
{
    private readonly ITestOutputHelper _output;

    public DataProtectionRedisTests(ITestOutputHelper output)
    {
        _output = output;
    }

    [Fact]
    public void GetAllElements_ReturnsAllXmlValuesForGivenKey()
    {
        var database = new Mock<IDatabase>();
        database.Setup(d => d.ListRange("Key", 0, -1, CommandFlags.None)).Returns(new RedisValue[]
        {
                "<Element1/>",
                "<Element2/>",
        }).Verifiable();
        var repo = new RedisXmlRepository(() => database.Object, "Key");

        var elements = repo.GetAllElements().ToArray();

        database.Verify();
        Assert.Equal(new XElement("Element1").ToString(), elements[0].ToString());
        Assert.Equal(new XElement("Element2").ToString(), elements[1].ToString());
    }

    [Fact]
    public void GetAllElements_ThrowsParsingException()
    {
        var database = new Mock<IDatabase>();
        database.Setup(d => d.ListRange("Key", 0, -1, CommandFlags.None)).Returns(new RedisValue[]
        {
                "<Element1/>",
                "<Element2",
        }).Verifiable();
        var repo = new RedisXmlRepository(() => database.Object, "Key");

        Assert.Throws<XmlException>(() => repo.GetAllElements());
    }

    [Fact]
    public void StoreElement_PushesValueToList()
    {
        var database = new Mock<IDatabase>();
        database.Setup(d => d.ListRightPush("Key", "<Element2 />", When.Always, CommandFlags.None)).Verifiable();
        var repo = new RedisXmlRepository(() => database.Object, "Key");

        repo.StoreElement(new XElement("Element2"), null);

        database.Verify();
    }

    [ConditionalFact]
    [TestRedisServerIsAvailable]
    public async Task XmlRoundTripsToActualRedisServer()
    {
        var connStr = TestRedisServer.GetConnectionString();

        _output.WriteLine("Attempting to connect to " + connStr);

        var guid = Guid.NewGuid().ToString();
        RedisKey key = "Test:DP:Key" + guid;

        try
        {
            using (var redis = await ConnectionMultiplexer.ConnectAsync(connStr).TimeoutAfter(TimeSpan.FromMinutes(1)))
            {
                var repo = new RedisXmlRepository(() => redis.GetDatabase(), key);
                var element = new XElement("HelloRedis", guid);
                repo.StoreElement(element, guid);
            }

            using (var redis = await ConnectionMultiplexer.ConnectAsync(connStr).TimeoutAfter(TimeSpan.FromMinutes(1)))
            {
                var repo = new RedisXmlRepository(() => redis.GetDatabase(), key);
                var elements = repo.GetAllElements();

                Assert.Contains(elements, e => e.Name == "HelloRedis" && e.Value == guid);
            }
        }
        finally
        {
            // cleanup
            using (var redis = await ConnectionMultiplexer.ConnectAsync(connStr).TimeoutAfter(TimeSpan.FromMinutes(1)))
            {
                await redis.GetDatabase().KeyDeleteAsync(key);
            }
        }

    }
}
