"use client";

/**
 * The message context menu: reply, copy, star, forward, delete, report.
 *
 * Opened by long-press on touch and right-click on desktop, both arbitrated by
 * MessageGestures. Positioned at the pointer and clamped to the viewport, so a
 * bubble near an edge doesn't push the menu off-screen.
 */

import { useEffect, useLayoutEffect, useRef, useState } from "react";
import {
  Copy,
  Flag,
  Forward,
  Reply,
  Star,
  StarOff,
  Trash2,
} from "lucide-react";
import { ReactionRow } from "@/components/chat/reaction-row";
import { cn } from "@/lib/utils";

export type MenuPoint = { x: number; y: number };

export type MessageMenuActions = {
  onReply: () => void;
  onCopy: () => void;
  onStar: () => void;
  onForward: () => void;
  onDeleteForMe: () => void;
  /** Absent when the caller isn't the sender — only they may erase for all. */
  onDeleteForEveryone?: () => void;
  onReport?: () => void;
};

const MARGIN = 8;

export function MessageMenu({
  point,
  starred,
  myReaction,
  onReact,
  actions,
  onClose,
}: {
  point: MenuPoint;
  starred: boolean;
  /** The viewer's current emoji on this message, if any. */
  myReaction?: string;
  /** Picking the same emoji again is a toggle — the caller decides. */
  onReact: (emoji: string) => void;
  actions: MessageMenuActions;
  onClose: () => void;
}) {
  const ref = useRef<HTMLDivElement>(null);
  const [pos, setPos] = useState<MenuPoint>(point);

  // Clamp after measuring, before paint, so the menu never flashes off-screen.
  useLayoutEffect(() => {
    const el = ref.current;
    if (!el) return;
    const { width, height } = el.getBoundingClientRect();
    setPos({
      x: Math.min(Math.max(MARGIN, point.x), window.innerWidth - width - MARGIN),
      y: Math.min(Math.max(MARGIN, point.y), window.innerHeight - height - MARGIN),
    });
  }, [point.x, point.y]);

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

  const run = (fn?: () => void) => () => {
    fn?.();
    onClose();
  };

  return (
    <>
      {/* Catches the next click or scroll anywhere and dismisses. */}
      <div
        className="fixed inset-0 z-40"
        onClick={onClose}
        onContextMenu={(e) => {
          e.preventDefault();
          onClose();
        }}
      />
      <div
        ref={ref}
        role="menu"
        style={{ left: pos.x, top: pos.y }}
        // min-w-56 rather than something tighter: "Delete for everyone" is the
        // longest label and, with its icon and padding, was wrapping or sitting
        // flush against the edge at a narrower width.
        className="fixed z-50 min-w-56 select-none overflow-hidden rounded-xl border border-border bg-background pb-1 shadow-lg"
      >
        {/* Reactions lead: they are the most common thing to want from a
            long press, and putting them in this menu keeps one gesture
            responsible for one surface. */}
        <ReactionRow
          current={myReaction}
          onPick={(emoji) => {
            onReact(emoji);
            onClose();
          }}
        />

        <Item icon={<Reply className="size-4" />} onClick={run(actions.onReply)}>
          Reply
        </Item>
        <Item icon={<Copy className="size-4" />} onClick={run(actions.onCopy)}>
          Copy
        </Item>
        <Item
          icon={
            starred ? <StarOff className="size-4" /> : <Star className="size-4" />
          }
          onClick={run(actions.onStar)}
        >
          {starred ? "Remove star" : "Star"}
        </Item>
        <Item
          icon={<Forward className="size-4" />}
          onClick={run(actions.onForward)}
        >
          Forward
        </Item>

        <div className="my-1 h-px bg-border" />

        <Item
          icon={<Trash2 className="size-4" />}
          onClick={run(actions.onDeleteForMe)}
        >
          Delete for me
        </Item>
        {actions.onDeleteForEveryone && (
          <Item
            danger
            icon={<Trash2 className="size-4" />}
            onClick={run(actions.onDeleteForEveryone)}
          >
            Delete for everyone
          </Item>
        )}
        {actions.onReport && (
          <Item
            danger
            icon={<Flag className="size-4" />}
            onClick={run(actions.onReport)}
          >
            Report
          </Item>
        )}
      </div>
    </>
  );
}

function Item({
  icon,
  onClick,
  danger = false,
  children,
}: {
  icon: React.ReactNode;
  onClick: () => void;
  danger?: boolean;
  children: React.ReactNode;
}) {
  return (
    <button
      type="button"
      role="menuitem"
      onClick={onClick}
      className={cn(
        "flex w-full items-center gap-2.5 px-3 py-2 text-left text-sm transition-colors",
        danger
          ? "text-destructive hover:bg-destructive/10"
          : "text-foreground hover:bg-muted",
      )}
    >
      {icon}
      {children}
    </button>
  );
}