import React from "react";
import { getSequenceWithModifier, type SpecialKey, type ModifierKey } from "../hooks/use-special-keys";

interface SpecialKeysPanelProps {
  onSend: (data: string) => void;
  isOpen: boolean;
  onClose: () => void;
  onKeepFocus?: () => void;
  activeModifier: ModifierKey | null;
  onModifierChange: (modifier: ModifierKey | null) => void;
}

const EXPANDED_KEYS: { key: SpecialKey; label: string }[] = [
  { key: "home", label: "Home" },
  { key: "end", label: "End" },
  { key: "pageup", label: "PgUp" },
  { key: "pagedown", label: "PgDn" },
  { key: "ctrlc", label: "Ctrl+C" },
  { key: "ctrld", label: "Ctrl+D" },
  { key: "ctrlz", label: "Ctrl+Z" },
];

const F_KEYS: { key: SpecialKey; label: string }[] = [
  { key: "f1", label: "F1" },
  { key: "f2", label: "F2" },
  { key: "f3", label: "F3" },
  { key: "f4", label: "F4" },
  { key: "f5", label: "F5" },
  { key: "f6", label: "F6" },
  { key: "f7", label: "F7" },
  { key: "f8", label: "F8" },
  { key: "f9", label: "F9" },
  { key: "f10", label: "F10" },
  { key: "f11", label: "F11" },
  { key: "f12", label: "F12" },
];

export const SpecialKeysPanel: React.FC<SpecialKeysPanelProps> = ({
  onSend,
  isOpen,
  onClose,
  onKeepFocus,
  activeModifier,
  onModifierChange,
}) => {
  if (!isOpen) return null;

  const handlePointerDown = (e: React.PointerEvent, key: SpecialKey) => {
    e.preventDefault();

    const result = getSequenceWithModifier(key, activeModifier);
    if (result) {
      onSend(result.sequence);
      if (result.clearModifier) {
        onModifierChange(null);
      }
    }

    onClose();
    // Always refocus terminal after sending
    requestAnimationFrame(() => {
      onKeepFocus?.();
    });
  };

  const handleOverlayPointerDown = (e: React.PointerEvent) => {
    e.preventDefault();
    onModifierChange(null);
    onClose();
    requestAnimationFrame(() => {
      onKeepFocus?.();
    });
  };

  return (
    <div
      className="special-keys-panel-overlay"
      onPointerDown={handleOverlayPointerDown}
    >
      <div
        className="special-keys-panel"
        onPointerDown={(e) => e.stopPropagation()}
      >
        <div className="special-keys-panel-section">
          {EXPANDED_KEYS.map(({ key, label }) => (
            <button
              key={key}
              className="special-key-button"
              onPointerDown={(e) => handlePointerDown(e, key)}
              type="button"
              tabIndex={-1}
            >
              {label}
            </button>
          ))}
        </div>
        <div className="special-keys-panel-divider" />
        <div className="special-keys-panel-section">
          {F_KEYS.map(({ key, label }) => (
            <button
              key={key}
              className="special-key-button"
              onPointerDown={(e) => handlePointerDown(e, key)}
              type="button"
              tabIndex={-1}
            >
              {label}
            </button>
          ))}
        </div>
      </div>
    </div>
  );
};