Telegram: add shared interactive renderer

extensions/telegram/src/shared-interactive.ts

@@ -0,0 +1,48 @@
+import type { InteractiveReply, InteractiveReplyButton } from "../../../src/interactive/payload.js";
+import type { TelegramInlineButton, TelegramInlineButtons } from "./button-types.js";
+
+const TELEGRAM_INTERACTIVE_ROW_SIZE = 3;
+
+function toTelegramButtonStyle(
+  style?: InteractiveReplyButton["style"],
+): TelegramInlineButton["style"] {
+  return style === "danger" || style === "success" || style === "primary" ? style : undefined;
+}
+
+function chunkInteractiveButtons(
+  buttons: readonly InteractiveReplyButton[],
+  rows: TelegramInlineButton[][],
+) {
+  for (let i = 0; i < buttons.length; i += TELEGRAM_INTERACTIVE_ROW_SIZE) {
+    const row = buttons.slice(i, i + TELEGRAM_INTERACTIVE_ROW_SIZE).map((button) => ({
+      text: button.label,
+      callback_data: button.value,
+      style: toTelegramButtonStyle(button.style),
+    }));
+    if (row.length > 0) {
+      rows.push(row);
+    }
+  }
+}
+
+export function buildTelegramInteractiveButtons(
+  interactive?: InteractiveReply,
+): TelegramInlineButtons | undefined {
+  const rows: TelegramInlineButton[][] = [];
+  for (const block of interactive?.blocks ?? []) {
+    if (block.type === "buttons") {
+      chunkInteractiveButtons(block.buttons, rows);
+      continue;
+    }
+    if (block.type === "select") {
+      chunkInteractiveButtons(
+        block.options.map((option) => ({
+          label: option.label,
+          value: option.value,
+        })),
+        rows,
+      );
+    }
+  }
+  return rows.length > 0 ? rows : undefined;
+}