"use client";

import { useEffect, useState, useCallback, useRef } from "react";
import { getBroadcastClient } from "@/lib/broadcast-client";
import type { InAppMessage } from "@bytelyst/broadcast-client";

export function BroadcastBanner() {
  const [messages, setMessages] = useState<InAppMessage[]>([]);
  const intervalRef = useRef<ReturnType<typeof setInterval> | null>(null);

  const fetchMessages = useCallback(async () => {
    try {
      const { messages: list } = await getBroadcastClient().listMessages();
      setMessages(list.filter((m) => m.status !== "dismissed"));
    } catch {
      // non-critical
    }
  }, []);

  useEffect(() => {
    fetchMessages();
    intervalRef.current = setInterval(fetchMessages, 5 * 60_000);
    return () => {
      if (intervalRef.current) clearInterval(intervalRef.current);
    };
  }, [fetchMessages]);

  async function dismiss(id: string) {
    try {
      await getBroadcastClient().markDismissed(id);
    } catch {
      // best-effort
    }
    setMessages((prev) => prev.filter((m) => m.id !== id));
  }

  async function handleClick(msg: InAppMessage) {
    try {
      await getBroadcastClient().trackClick(msg.id);
    } catch {
      // best-effort
    }
    if (msg.ctaUrl) window.open(msg.ctaUrl, "_blank", "noopener");
  }

  if (messages.length === 0) return null;

  return (
    <div style={{ display: "grid", gap: "var(--nl-space-2)", padding: "var(--nl-space-3) var(--nl-space-4)" }}>
      {messages.map((msg) => (
        <div
          key={msg.id}
          role="status"
          style={{
            display: "flex",
            alignItems: "center",
            justifyContent: "space-between",
            padding: "var(--nl-space-3) var(--nl-space-4)",
            background: msg.priority === "high" || msg.priority === "urgent" ? "var(--nl-warning-muted)" : "var(--nl-info-muted)",
            borderRadius: "var(--nl-radius-sm)",
            fontSize: "var(--nl-fs-sm)",
          }}
        >
          <div style={{ display: "flex", alignItems: "center", gap: "var(--nl-space-3)", flex: 1, minWidth: 0 }}>
            <strong style={{ whiteSpace: "nowrap" }}>{msg.title}</strong>
            {msg.body && <span style={{ color: "var(--nl-text-secondary)", overflow: "hidden", textOverflow: "ellipsis", whiteSpace: "nowrap" }}>{msg.body}</span>}
            {msg.ctaUrl && (
              <button onClick={() => handleClick(msg)} style={{ background: "none", border: "none", color: "var(--nl-accent-primary)", cursor: "pointer", fontWeight: 600, whiteSpace: "nowrap" }}>
                {msg.ctaText ?? "Learn more"}
              </button>
            )}
          </div>
          {msg.dismissible !== false && (
            <button onClick={() => dismiss(msg.id)} aria-label="Dismiss" style={{ background: "none", border: "none", color: "var(--nl-text-secondary)", cursor: "pointer", fontSize: 16, lineHeight: 1, padding: "0 0 0 var(--nl-space-3)" }}>
              &times;
            </button>
          )}
        </div>
      ))}
    </div>
  );
}