diff --git a/LibMatrix/Helpers/MessageBuilder.cs b/LibMatrix/Helpers/MessageBuilder.cs
index d3bd6a5..5e2b1b7 100644
--- a/LibMatrix/Helpers/MessageBuilder.cs
+++ b/LibMatrix/Helpers/MessageBuilder.cs
@@ -0,0 +1,133 @@
+using LibMatrix.EventTypes.Spec;
+
+namespace LibMatrix.Helpers;
+
+public class MessageBuilder(string msgType = "m.text", string format = "org.matrix.custom.html") {
+ private RoomMessageEventContent Content { get; set; } = new() {
+ MessageType = msgType,
+ Format = format
+ };
+
+ public RoomMessageEventContent Build() => Content;
+
+ public MessageBuilder WithBody(string body, string? formattedBody = null) {
+ Content.Body += body;
+ Content.FormattedBody += formattedBody ?? body;
+ return this;
+ }
+
+ public MessageBuilder WithHtmlTag(string tag, string body, Dictionary<string, string>? attributes = null) {
+ Content.Body += body;
+ Content.FormattedBody += $"<{tag}";
+ if (attributes != null)
+ foreach (var (key, value) in attributes)
+ Content.FormattedBody += $" {key}=\"{value}\"";
+ Content.FormattedBody += $">{body}</{tag}>";
+ return this;
+ }
+
+ public MessageBuilder WithHtmlTag(string tag, Action<MessageBuilder> bodyBuilder, Dictionary<string, string>? attributes = null) {
+ Content.FormattedBody += $"<{tag}";
+ if (attributes != null)
+ foreach (var (key, value) in attributes)
+ Content.FormattedBody += $" {key}=\"{value}\"";
+ Content.FormattedBody += ">";
+ bodyBuilder(this);
+ Content.FormattedBody += $"</{tag}>";
+ return this;
+ }
+
+ public MessageBuilder WithColoredBody(string color, string body) {
+ Content.Body += body;
+ Content.FormattedBody += $"<font color=\"{color}\">{body}</font>";
+ return this;
+ }
+
+ public MessageBuilder WithColoredBody(string color, Action<MessageBuilder> bodyBuilder) {
+ Content.FormattedBody += $"<font color=\"{color}\">";
+ bodyBuilder(this);
+ Content.FormattedBody += "</font>";
+ return this;
+ }
+
+ public MessageBuilder WithCustomEmoji(string mxcUri, string name) {
+ Content.Body += $"{{{name}}}";
+ Content.FormattedBody += $"<img data-mx-emoticon height=\"32\" src=\"{mxcUri}\" alt=\"{name}\" title=\"{name}\" />";
+ return this;
+ }
+
+ public MessageBuilder WithRainbowString(string text, byte skip = 1, int offset = 0, double lengthFactor = 255.0, bool useLength = true) {
+ if (useLength) {
+ lengthFactor = text.Length;
+ }
+
+ // HslaColorInterpolator interpolator = new((0, 255, 128, 255), (255, 255, 128, 255));
+ // // RainbowEnumerator enumerator = new(skip, offset, lengthFactor);
+ // for (int i = 0; i < text.Length; i++) {
+ // // var (r, g, b) = enumerator.Next();
+ // // var (r,g,b,a) = interpolator.Interpolate((i+offset) * skip, lengthFactor).ToRgba();
+ // // Console.WriteLine($"RBA: {r} {g} {b} {a}");
+ // // Content.FormattedBody += $"<font color=\"#{r:X2}{g:X2}{b:X2}\">{text[i]}</font>";
+ // }
+ return this;
+ }
+
+ public MessageBuilder WithCodeBlock(string code, string language = "plaintext") {
+ Content.Body += code;
+ Content.FormattedBody += $"<pre><code class=\"language-{language}\">{code}</code></pre>";
+ return this;
+ }
+
+ public MessageBuilder WithCollapsibleSection(string title, string body) {
+ Content.Body += body;
+ Content.FormattedBody += $"<details><summary>{title}</summary>{body}</details>";
+ return this;
+ }
+
+ public MessageBuilder WithCollapsibleSection(string title, Action<MessageBuilder> bodyBuilder) {
+ Content.FormattedBody += $"<details><summary>{title}</summary>";
+ bodyBuilder(this);
+ Content.FormattedBody += "</details>";
+ return this;
+ }
+
+ public MessageBuilder WithMention(string id, string? displayName = null) {
+ Content.Body += $"@{displayName ?? id}";
+ Content.FormattedBody += $"<a href=\"https://matrix.to/#/{id}\">{displayName ?? id}</a>";
+ return this;
+ }
+
+ public MessageBuilder WithNewline() {
+ Content.Body += "\n";
+ Content.FormattedBody += "<br>";
+ return this;
+ }
+
+ public MessageBuilder WithTable(Action<TableBuilder> tableBuilder) {
+ var tb = new TableBuilder(this);
+ WithHtmlTag("table", msb => tableBuilder(tb));
+ return this;
+ }
+
+ public class TableBuilder(MessageBuilder msb) {
+ public TableBuilder WithTitle(string title, int colspan) {
+ msb.Content.Body += title + "\n";
+ msb.Content.FormattedBody += $"<thead><tr><th colspan=\"{colspan}\">{title}</th></tr></thead><br/>";
+ return this;
+ }
+
+ public TableBuilder WithRow(Action<RowBuilder> rowBuilder) {
+ var rb = new RowBuilder(msb);
+ msb.WithHtmlTag("tr", msb => rowBuilder(rb)).WithBody("\n");
+ return this;
+ }
+
+ public class RowBuilder(MessageBuilder msb) {
+ public RowBuilder WithCell(string content, Dictionary<string, string>? attributes = null) {
+ msb.Content.Body += content + "\n";
+ msb.Content.FormattedBody += $"<td>{content}</td>\t";
+ return this;
+ }
+ }
+ }
+}
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