using System.Linq;
using Xunit;
using ytLive.Services;

namespace ytLive.Tests;

/// <summary>
/// 2026-11-05 ruling (retires TASK 49's local wordlist): YouTube owns chat moderation, so the
/// behaviour we owe it is not a second list — it is <b>not showing what YouTube has removed</b>.
/// The feed sends deleted messages as a <c>tombstone</c> placeholder carrying no text, and marks
/// non-displayable events with <c>hasDisplayContent: false</c>; both used to become blank rows on
/// the overlay (the parser had no filter at all).
/// </summary>
public class ChatModerationParseTests
{
    [Fact]
    public void Tombstone_NeverBecomesAChatRow()
    {
        const string json = """
        {
          "items": [
            {"id":"d1","snippet":{"type":"tombstone","liveChatId":"c","publishedAt":"2026-11-05T10:00:00.000Z"}},
            {"id":"m1","snippet":{"type":"textMessageEvent","hasDisplayContent":true,
              "textMessageDetails":{"messageText":"hello"},"publishedAt":"2026-11-05T10:00:01.000Z"},
            "authorDetails":{"displayName":"Viewer","channelId":"UC1"}}
          ],
          "nextPageToken":"n"
        }
        """;

        var page = YouTubeChatService.ParsePage(json);

        Assert.Single(page.Messages);
        Assert.Equal("hello", page.Messages[0].Message);
    }

    [Fact]
    public void MessagesWithoutDisplayContent_AreSkipped()
    {
        const string json = """
        {
          "items": [
            {"id":"m1","snippet":{"type":"textMessageEvent","hasDisplayContent":false,
              "publishedAt":"2026-11-05T10:00:00.000Z"},
             "authorDetails":{"displayName":"Muted","channelId":"UC1"}},
            {"id":"m2","snippet":{"type":"textMessageEvent","hasDisplayContent":true,
              "textMessageDetails":{"messageText":"visible"},"publishedAt":"2026-11-05T10:00:01.000Z"},
             "authorDetails":{"displayName":"Viewer","channelId":"UC2"}}
          ]
        }
        """;

        var page = YouTubeChatService.ParsePage(json);

        Assert.Single(page.Messages);
        Assert.Equal("visible", page.Messages[0].Message);
    }

    [Fact]
    public void ChatModeEvents_AreNotChat()
    {
        const string json = """
        {
          "items": [
            {"id":"e1","snippet":{"type":"sponsorOnlyModeStartedEvent","hasDisplayContent":false,
              "publishedAt":"2026-11-05T10:00:00.000Z"}},
            {"id":"e2","snippet":{"type":"chatEndedEvent","publishedAt":"2026-11-05T10:00:01.000Z"}}
          ]
        }
        """;

        Assert.Empty(YouTubeChatService.ParsePage(json).Messages);
    }

    [Fact]
    public void RealChatStillParses_WithAuthorAndSuperChat()
    {
        const string json = """
        {
          "items": [
            {"id":"m1","snippet":{"type":"superChatEvent","hasDisplayContent":true,
              "superChatDetails":{"amountMicros":12340000,"currency":"USD","amountDisplayString":"$12.34",
                                  "userComment":"nice stream"},"publishedAt":"2026-11-05T10:00:00.000Z"},
             "authorDetails":{"displayName":"Funder","channelId":"UC9","isChatSponsor":true}}
          ]
        }
        """;

        var message = Assert.Single(YouTubeChatService.ParsePage(json).Messages);

        Assert.Equal("Funder", message.AuthorName);
        Assert.True(message.IsSuperChat);
        // Constraint that survives the TASK 49 retirement: reward fields are never reinterpreted.
        Assert.Equal("$12.34", message.SuperChatDisplayString);
        Assert.Equal("nice stream", message.Message);
    }
}