"use client";

import React, { useState } from "react";
import Link from "next/link";
import { useRouter } from "next/navigation";
import ThemeToggle from "@/components/ThemeToggle";

export function getClientToken(): string {
  if (typeof window === "undefined") return "";
  const match = document.cookie.match(new RegExp("(^| )admin_token=([^;]+)"));
  if (match) return decodeURIComponent(match[2]);
  return localStorage.getItem("admin_token") || "";
}

export function setClientToken(token: string) {
  if (typeof window === "undefined") return;
  document.cookie = `admin_token=${encodeURIComponent(token)}; path=/; max-age=604800; SameSite=Lax`;
  localStorage.setItem("admin_token", token);
}

export function removeClientToken() {
  if (typeof window === "undefined") return;
  document.cookie = "admin_token=; path=/; max-age=0; SameSite=Lax";
  localStorage.removeItem("admin_token");
}

export function AdminHeader({ title, description, action }: { title: string; description?: string; action?: React.ReactNode }) {
  return (
    <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between pb-6 mb-6 border-b border-line gap-4">
      <div>
        <h1 className="text-2xl font-bold text-ink tracking-tight">{title}</h1>
        {description && <p className="text-sm text-ink/70 mt-1">{description}</p>}
      </div>
      <div className="flex items-center gap-3 shrink-0">
        {action}
        <ThemeToggle />
      </div>
    </div>
  );
}

export function AlertBanner({ type, message, onClose }: { type: "error" | "success" | "info"; message: string; onClose?: () => void }) {
  const styles = {
    error: "bg-red-50 dark:bg-red-950/40 border-red-200 dark:border-red-800 text-red-700 dark:text-red-300",
    success: "bg-emerald-50 dark:bg-emerald-950/40 border-emerald-200 dark:border-emerald-800 text-emerald-700 dark:text-emerald-300",
    info: "bg-blue-50 dark:bg-blue-950/40 border-blue-200 dark:border-blue-800 text-blue-700 dark:text-blue-300",
  };

  return (
    <div className={`p-4 rounded-md border mb-4 flex items-center justify-between text-sm ${styles[type]}`}>
      <div>{message}</div>
      {onClose && (
        <button onClick={onClose} className="text-xs font-semibold underline ml-4 hover:opacity-75">
          Dismiss
        </button>
      )}
    </div>
  );
}

export function Modal({ isOpen, title, onClose, children }: { isOpen: boolean; title: string; onClose: () => void; children: React.ReactNode }) {
  if (!isOpen) return null;

  return (
    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50 backdrop-blur-sm p-4">
      <div className="bg-paper border border-line rounded-lg shadow-xl w-full max-w-2xl max-h-[90vh] overflow-y-auto">
        <div className="flex items-center justify-between px-6 py-4 border-b border-line">
          <h3 className="text-lg font-bold text-ink">{title}</h3>
          <button onClick={onClose} className="text-ink/60 hover:text-ink text-xl font-bold">
            &times;
          </button>
        </div>
        <div className="p-6">{children}</div>
      </div>
    </div>
  );
}

export function ConfirmDeleteModal({
  isOpen,
  title = "Confirm Deletion",
  description = "Are you sure you want to delete this item? This action cannot be undone.",
  onClose,
  onConfirm,
  isSubmitting,
}: {
  isOpen: boolean;
  title?: string;
  description?: string;
  onClose: () => void;
  onConfirm: () => void;
  isSubmitting?: boolean;
}) {
  if (!isOpen) return null;

  return (
    <Modal isOpen={isOpen} title={title} onClose={onClose}>
      <div className="space-y-4">
        <p className="text-sm text-ink/80">{description}</p>
        <div className="flex justify-end gap-3 pt-4 border-t border-line">
          <button
            type="button"
            onClick={onClose}
            className="px-4 py-2 text-sm rounded border border-line bg-paper hover:bg-ivory text-ink font-medium"
          >
            Cancel
          </button>
          <button
            type="button"
            onClick={onConfirm}
            disabled={isSubmitting}
            className="px-4 py-2 text-sm rounded bg-red-600 hover:bg-red-700 text-white font-medium disabled:opacity-50"
          >
            {isSubmitting ? "Deleting..." : "Delete Permanently"}
          </button>
        </div>
      </div>
    </Modal>
  );
}
