using VoiceCat.Server.Data;
using Voicecat.V1;
using static VoiceCat.Tests.ServerTests;

namespace VoiceCat.Tests;

public class ChannelManagementTests
{
    internal static async Task<Client> AdminAsync(ServerFixture fixture)
    {
        using (var store = new AccountStore(Path.Combine(fixture.Directory, "voicecat.db")))
            await store.CreateAccountAsync("Admin", "secret", true);
        Client client = await fixture.ConnectAsync();
        client.Send(new() { ClientHello = new() { ProtoVersion = 2 } });
        await client.ReadUntilAsync(e => e.ServerHello is not null);
        client.Send(new() { AuthRequest = new() { Password = new() { Username = "Admin", Password = "secret" } } });
        Assert.True((await client.ReadUntilAsync(e => e.AuthResult is not null)).AuthResult.Ok);
        await client.ReadUntilAsync(e => e.ServerState is not null);
        return client;
    }

    private static Channel Room(string name = "Protected") => new()
    {
        Name = name, MaxUsers = 1,
        Audio = new() { SampleRate = 48000, BitrateBps = 24000, FrameMs = 20, Complexity = 5, Fec = true }
    };

    internal static async Task<bool> ResultAsync(Client client, Envelope request)
    {
        request.RequestId = 42;
        client.Send(request);
        Envelope result = await client.ReadUntilAsync(e => e.GenericResult is not null);
        Assert.Equal(42UL, result.RequestId);
        return result.GenericResult.Ok;
    }

    [Fact]
    public async Task ProtectedChannelCrudEnforcesPasswordCapacityAndMovesMembersToLobby()
    {
        await using var fixture = new ServerFixture();
        await using var guest = await fixture.ConnectAsync();
        User user = await guest.LoginAsync("Guest");
        await using var admin = await AdminAsync(fixture);
        Assert.False(await ResultAsync(guest, new() { CreateChannel = new() { Channel = Room() } }));
        Assert.True(await ResultAsync(admin, new() { CreateChannel = new() { Channel = Room(), Password = "pāssword" } }));
        Channel room = (await guest.ReadUntilAsync(e => e.ChannelEvent?.Kind == ChannelEvent.Types.Kind.Created)).ChannelEvent.Channel;
        Assert.True(room.PasswordProtected);
        foreach (string password in new[] { "", "wrong", "pāssword" })
        {
            guest.Send(new() { RequestId = 7, JoinChannel = new() { ChannelId = room.Id, Password = password } });
            Envelope result = await guest.ReadUntilAsync(e => e.JoinChannelResult is not null);
            Assert.Equal(7UL, result.RequestId);
            Assert.Equal(password == "pāssword", result.JoinChannelResult.Ok);
        }
        admin.Send(new() { JoinChannel = new() { ChannelId = room.Id, Password = "pāssword" } });
        Assert.False((await admin.ReadUntilAsync(e => e.JoinChannelResult is not null)).JoinChannelResult.Ok);
        room.Name = "Renamed";
        Assert.False(await ResultAsync(guest, new() { EditChannel = new() { Channel = room } }));
        Assert.True(await ResultAsync(admin, new() { EditChannel = new() { Channel = room } }));
        Assert.Equal("Renamed", (await guest.ReadUntilAsync(e => e.ChannelEvent is not null)).ChannelEvent.Channel.Name);
        using (var store = new AccountStore(Path.Combine(fixture.Directory, "voicecat.db")))
        {
            Assert.Equal("Renamed", store.LoadChannels().Single(c => c.Id == room.Id).Name);
            Assert.True(store.CheckChannelPassword(room.Id, "pāssword"));
            Assert.False(store.CheckChannelPassword(room.Id, "wrong"));
        }
        Assert.True(await ResultAsync(admin, new() { DeleteChannel = new() { ChannelId = room.Id } }));
        Assert.Equal(room.Id, (await guest.ReadUntilAsync(e => e.ChannelEvent?.Kind == ChannelEvent.Types.Kind.Deleted)).ChannelEvent.DeletedId);
        guest.Send(new() { Subscribe = new() });
        var snapshot = (await guest.ReadUntilAsync(e => e.ServerState is not null)).ServerState;
        Assert.Equal(1U, snapshot.Users.Single(u => u.Id == user.Id).ChannelId);
        Assert.DoesNotContain(snapshot.Channels, c => c.Id == room.Id);
        using var reopened = new AccountStore(Path.Combine(fixture.Directory, "voicecat.db"));
        Assert.DoesNotContain(reopened.LoadChannels(), c => c.Id == room.Id);
    }

    [Fact]
    public async Task InvalidChangesCannotCorruptChannelTreeOrLobby()
    {
        await using var fixture = new ServerFixture();
        await using var admin = await AdminAsync(fixture);
        Assert.True(await ResultAsync(admin, new() { CreateChannel = new() { Channel = Room("Parent") } }));
        using var store = new AccountStore(Path.Combine(fixture.Directory, "voicecat.db"));
        Channel parent = store.LoadChannels().Single(c => c.Name == "Parent");
        Channel child = Room("Child"); child.ParentId = parent.Id;
        Assert.True(await ResultAsync(admin, new() { CreateChannel = new() { Channel = child } }));
        child = store.LoadChannels().Single(c => c.Name == "Child");
        parent.ParentId = child.Id;
        Assert.False(await ResultAsync(admin, new() { EditChannel = new() { Channel = parent } }));
        Assert.False(await ResultAsync(admin, new() { DeleteChannel = new() { ChannelId = parent.Id } }));
        Assert.False(await ResultAsync(admin, new() { DeleteChannel = new() { ChannelId = 1 } }));
        Channel lobby = store.LoadChannels().Single(c => c.Id == 1);
        Assert.False(await ResultAsync(admin, new() { EditChannel = new() { Channel = lobby, Password = "lockout" } }));
        Assert.False(await ResultAsync(admin, new() { CreateChannel = new() { Channel = Room("Child") } }));
        var invalid = Room("Invalid"); invalid.Audio.SampleRate = 123;
        Assert.False(await ResultAsync(admin, new() { CreateChannel = new() { Channel = invalid } }));
        Assert.False(await ResultAsync(admin, new() { CreateChannel = new() }));
        Assert.Equal(4, store.LoadChannels().Count);
        Assert.True(await ResultAsync(admin, new() { DeleteChannel = new() { ChannelId = child.Id } }));
        Assert.True(await ResultAsync(admin, new() { DeleteChannel = new() { ChannelId = parent.Id } }));
    }
}