using AcDream.Core.Chat;
using Xunit;

namespace AcDream.Core.Tests.Chat;

public sealed class ChatLogTests
{
    [Fact]
    public void OnLocalSpeech_AppendsEntry_FiresEvent()
    {
        var log = new ChatLog();
        ChatEntry? seen = null;
        log.EntryAppended += e => seen = e;

        log.OnLocalSpeech("Alice", "hi", 0xAA, isRanged: false);

        Assert.Equal(1, log.Count);
        Assert.NotNull(seen);
        Assert.Equal(ChatKind.LocalSpeech, seen!.Value.Kind);
        Assert.Equal("Alice", seen.Value.Sender);
        Assert.Equal("hi", seen.Value.Text);
    }

    [Fact]
    public void OnLocalSpeech_Ranged_SetsRangedKind()
    {
        var log = new ChatLog();
        log.OnLocalSpeech("Bob", "SHOUT", 0xBB, isRanged: true);
        Assert.Equal(ChatKind.RangedSpeech, log.Snapshot()[0].Kind);
    }

    [Fact]
    public void OnChannelBroadcast_SetsChannelId()
    {
        var log = new ChatLog();
        log.OnChannelBroadcast(channelId: 42, sender: "Alice", text: "allegiance motd");
        var e = log.Snapshot()[0];
        Assert.Equal(42u, e.ChannelId);
        Assert.Equal(ChatKind.Channel, e.Kind);
    }

    [Fact]
    public void OnTellReceived_SetsTellKind()
    {
        var log = new ChatLog();
        log.OnTellReceived("Alice", "psst", 0xAA);
        Assert.Equal(ChatKind.Tell, log.Snapshot()[0].Kind);
    }

    [Fact]
    public void OnSystemMessage_EncodesChatType_AsChannelId()
    {
        var log = new ChatLog();
        log.OnSystemMessage("Your spell fizzled!", chatType: 5);
        var e = log.Snapshot()[0];
        Assert.Equal(ChatKind.System, e.Kind);
        Assert.Equal(5u, e.ChannelId);
    }

    [Fact]
    public void OnSelfSent_EchoesOutbound()
    {
        var log = new ChatLog();
        log.OnSelfSent(ChatKind.Tell, "hey", targetOrChannel: "Alice");
        var e = log.Snapshot()[0];
        Assert.Equal("Alice", e.Sender);
        Assert.Equal("hey", e.Text);
    }

    [Fact]
    public void RingBuffer_DropsOldestBeyondCapacity()
    {
        var log = new ChatLog(maxEntries: 3);
        log.OnLocalSpeech("A", "1", 0, false);
        log.OnLocalSpeech("B", "2", 0, false);
        log.OnLocalSpeech("C", "3", 0, false);
        log.OnLocalSpeech("D", "4", 0, false);

        var snap = log.Snapshot();
        Assert.Equal(3, snap.Length);
        Assert.Equal("2", snap[0].Text);   // "1" was dropped
        Assert.Equal("4", snap[2].Text);
    }

    [Fact]
    public void Clear_EmptiesBuffer()
    {
        var log = new ChatLog();
        log.OnLocalSpeech("A", "1", 0, false);
        log.Clear();
        Assert.Equal(0, log.Count);
    }
}