import { useEffect } from "react";
import { useMessageStore } from "../stores/message.ts";

interface PinnedMessagesProps {
  channelId: string;
  channelName: string;
  onClose: () => void;
  onJump?: (messageId: string) => void;
}

export function PinnedMessages({ channelId, channelName, onClose, onJump }: PinnedMessagesProps) {
  const pinnedMessages = useMessageStore((s) => s.pinnedMessagesByChannel[channelId] || []);
  const fetchPinnedMessages = useMessageStore((s) => s.fetchPinnedMessages);
  const unpinMessage = useMessageStore((s) => s.unpinMessage);

  useEffect(() => {
    fetchPinnedMessages(channelId);
  }, [channelId, fetchPinnedMessages]);

  useEffect(() => {
    const handler = (e: KeyboardEvent) => {
      if (e.key === "Escape") {
        onClose();
      }
    };
    window.addEventListener("keydown", handler);
    return () => window.removeEventListener("keydown", handler);
  }, [onClose]);

  return (
    <div className="absolute inset-x-0 top-0 z-20 bg-gb-bg border-b border-gb-bg-t shadow-lg">
      <div className="px-3 py-2 border-b border-gb-bg-t flex items-center justify-between">
        <span className="text-xs text-gb-orange font-mono">PINNED IN #{channelName.toUpperCase()} ({pinnedMessages.length}/5)</span>
        <button onClick={onClose} className="text-xs text-gb-red hover:text-gb-orange">[x]</button>
      </div>
      <div className="max-h-64 overflow-y-auto font-mono text-xs">
        {pinnedMessages.length === 0 ? (
          <div className="px-3 py-4 text-center text-gb-fg-f">[no pinned messages in this channel]</div>
        ) : (
          pinnedMessages.map((msg) => (
            <div
              key={msg.id}
              className="w-full text-left px-3 py-2 border-b border-gb-bg-t last:border-b-0 hover:bg-gb-bg-s/20 flex flex-col gap-1"
            >
              <div className="flex items-center justify-between text-gb-fg-f">
                <div className="flex items-center gap-2">
                  <span className="text-gb-aqua font-bold">&lt;{msg.author_username}&gt;</span>
                  <span className="text-[10px] text-gb-fg-f">
                    {new Date(msg.created_at).toLocaleString()}
                  </span>
                </div>
                <div className="flex items-center gap-2">
                  {onJump && (
                    <button
                      onClick={() => {
                        onJump(msg.id);
                        onClose();
                      }}
                      className="text-gb-aqua hover:text-gb-orange"
                      title="Jump to message"
                    >
                      [JUMP]
                    </button>
                  )}
                  <button
                    onClick={async () => {
                      if (confirm("Unpin this message?")) {
                        try {
                          await unpinMessage(channelId, msg.id);
                        } catch (err) {
                          alert(err instanceof Error ? err.message : "Failed to unpin");
                        }
                      }
                    }}
                    className="text-gb-red hover:text-gb-orange"
                    title="Unpin message"
                  >
                    [UNPIN]
                  </button>
                </div>
              </div>
              <div className="text-gb-fg break-words whitespace-pre-wrap">{msg.content}</div>
            </div>
          ))
        )}
      </div>
    </div>
  );
}