agent-platform/web/src/pages/sessions/components/MessageBubble.tsx

import { useTranslation } from "react-i18next";
import { cn } from "@/lib/utils";
import type { Message } from "@/types";

export function MessageBubble({ message }: { message: Message }) {
  const { t } = useTranslation();
  const isUser = message.role === "user";
  const isSystem = message.role === "system";
  const content = readableContent(message, t);
  return (
    <div className={cn("flex min-w-0", isUser ? "justify-end" : isSystem ? "justify-center" : "justify-start")}>
      <div
        className={cn(
          "min-w-0 max-w-[82%] rounded-md border px-3 py-2 text-sm",
          isUser && "border-primary/30 bg-primary text-primary-foreground",
          !isUser && !isSystem && "border-border bg-surface-elevated",
          isSystem && "max-w-[90%] border-border bg-muted/50 text-muted-foreground")}
      >
        {!isSystem ? (
          <div className={cn("mb-0.5 text-[11px] font-medium uppercase tracking-wide", isUser ? "text-primary-foreground/70" : "text-muted-foreground")}>
            {isUser ? t("sessions.roleUser") : t("sessions.roleAssistant")}
          </div>
        ) : null}
        <p className="whitespace-pre-wrap break-words leading-6 [overflow-wrap:anywhere]">{content}</p>
      </div>
    </div>
  );
}

function readableContent(message: Message, t: (key: string, options?: Record<string, unknown>) => string) {
  const text = message.content_text?.trim();
  if (text) return text;
  const payload = message.content_json;
  if (!payload) return t("sessions.noTextContent");
  if (typeof payload === "string") return payload;
  if (Array.isArray(payload)) return t("sessions.structuredItems", { count: payload.length });
  if (typeof payload === "object") {
    const record = payload as Record<string, unknown>;
    for (const key of ["text", "message", "answer", "output", "result", "content"]) {
      const value = record[key];
      if (typeof value === "string" && value.trim()) return value;
    }
    return t("sessions.structuredMessage");
  }
  return String(payload);
}