DiscordChatExporter/DiscordChatExporter.Core/Exporting/Filtering/HasMessageFilter.cs

using System;
using System.Linq;
using DiscordChatExporter.Core.Discord.Data;
using DiscordChatExporter.Core.Markdown.Parsing;

namespace DiscordChatExporter.Core.Exporting.Filtering;

internal class HasMessageFilter(MessageContentMatchKind kind) : MessageFilter
{
    public override bool IsMatch(Message message) =>
        kind switch
        {
            MessageContentMatchKind.Link => MarkdownParser.ExtractLinks(message.Content).Any(),
            MessageContentMatchKind.Embed => message.Embeds.Any(),
            MessageContentMatchKind.File => message.Attachments.Any(),
            MessageContentMatchKind.Video => message.Attachments.Any(file => file.IsVideo),
            MessageContentMatchKind.Image => message.Attachments.Any(file => file.IsImage),
            MessageContentMatchKind.Sound => message.Attachments.Any(file => file.IsAudio),
            MessageContentMatchKind.Pin => message.IsPinned,
            MessageContentMatchKind.Invite
                => MarkdownParser
                    .ExtractLinks(message.Content)
                    .Select(l => l.Url)
                    .Select(Invite.TryGetCodeFromUrl)
                    .Any(c => !string.IsNullOrWhiteSpace(c)),
            _
                => throw new InvalidOperationException(
                    $"Unknown message content match kind '{kind}'."
                )
        };
}