"use client";

import { useState, useEffect } from "react";
import PropTypes from "prop-types";
import Link from "next/link";
import { usePathname } from "next/navigation";
import { cn } from "@/shared/utils/cn";
import { APP_CONFIG } from "@/shared/constants/config";
import Button from "./Button";
import { ConfirmModal } from "./Modal";

const navItems = [
  { href: "/dashboard/endpoint", label: "Endpoint", icon: "api" },
  { href: "/dashboard/providers", label: "Providers", icon: "dns" },
  { href: "/dashboard/combos", label: "Combos", icon: "layers" },
  { href: "/dashboard/usage", label: "Usage", icon: "bar_chart" },
  { href: "/dashboard/cli-tools", label: "CLI Tools", icon: "terminal" },
];

// Debug items (only show when ENABLE_REQUEST_LOGS=true)
const debugItems = [
  // { href: "/dashboard/translator", label: "Translator", icon: "translate" },
  { href: "/dashboard/console-log", label: "Console Log", icon: "terminal" },
];

const systemItems = [
  { href: "/dashboard/profile", label: "Settings", icon: "settings" },
];

export default function Sidebar({ onClose }) {
  const pathname = usePathname();
  const [showShutdownModal, setShowShutdownModal] = useState(false);
  const [isShuttingDown, setIsShuttingDown] = useState(false);
  const [isDisconnected, setIsDisconnected] = useState(false);
  const [updateInfo, setUpdateInfo] = useState(null);

  // Lazy check for new npm version on mount
  useEffect(() => {
    fetch("/api/version")
      .then(res => res.json())
      .then(data => { if (data.hasUpdate) setUpdateInfo(data); })
      .catch(() => {});
  }, []);

  const isActive = (href) => {
    if (href === "/dashboard/endpoint") {
      return pathname === "/dashboard" || pathname.startsWith("/dashboard/endpoint");
    }
    return pathname.startsWith(href);
  };

  const handleShutdown = async () => {
    setIsShuttingDown(true);
    try {
      await fetch("/api/shutdown", { method: "POST" });
    } catch (e) {
      // Expected to fail as server shuts down; ignore error
    }
    setIsShuttingDown(false);
    setShowShutdownModal(false);
    setIsDisconnected(true);
  };

  return (
    <>
      <aside className="flex w-72 flex-col border-r border-black/5 dark:border-white/5 bg-vibrancy backdrop-blur-xl transition-colors duration-300">
        {/* Traffic lights */}
        <div className="flex items-center gap-2 px-6 pt-5 pb-2">
          <div className="w-3 h-3 rounded-full bg-[#FF5F56]" />
          <div className="w-3 h-3 rounded-full bg-[#FFBD2E]" />
          <div className="w-3 h-3 rounded-full bg-[#27C93F]" />
        </div>

        {/* Logo */}
        <div className="px-6 py-4 flex flex-col gap-2">
          <Link href="/dashboard" className="flex items-center gap-3">
            <div className="flex items-center justify-center size-9 rounded bg-linear-to-br from-[#f97815] to-[#c2590a]">
              <span className="material-symbols-outlined text-white text-[20px]">hub</span>
            </div>
            <div className="flex flex-col">
              <h1 className="text-lg font-semibold tracking-tight text-text-main">
                {APP_CONFIG.name}
              </h1>
              <span className="text-xs text-text-muted">v{APP_CONFIG.version}</span>
            </div>
          </Link>
          {updateInfo && (
            <div className="flex flex-col gap-0.5">
              <span className="text-xs font-semibold text-green-600 dark:text-amber-500">
                ↑ New version available: v{updateInfo.latestVersion}
              </span>
              <code className="text-[10px] text-green-600/80 dark:text-amber-400/70 font-mono select-all">
                npm install -g 9router@latest
              </code>
            </div>
          )}
        </div>

        {/* Navigation */}
        <nav className="flex-1 px-4 py-2 space-y-1 overflow-y-auto custom-scrollbar">
          {navItems.map((item) => (
            <Link
              key={item.href}
              href={item.href}
              onClick={onClose}
              className={cn(
                "flex items-center gap-3 px-4 py-2 rounded-lg transition-all group",
                isActive(item.href)
                  ? "bg-primary/10 text-primary"
                  : "text-text-muted hover:bg-surface/50 hover:text-text-main"
              )}
            >
              <span
                className={cn(
                  "material-symbols-outlined text-[18px]",
                  isActive(item.href) ? "fill-1" : "group-hover:text-primary transition-colors"
                )}
              >
                {item.icon}
              </span>
              <span className="text-sm font-medium">{item.label}</span>
            </Link>
          ))}

          {/* Debug section */}
          <div className="pt-4 mt-2">
              <p className="px-4 text-xs font-semibold text-text-muted/60 uppercase tracking-wider mb-2">
                Debug
              </p>
              {debugItems.map((item) => (
                <Link
                  key={item.href}
                  href={item.href}
                  onClick={onClose}
                  className={cn(
                    "flex items-center gap-3 px-4 py-2 rounded-lg transition-all group",
                    isActive(item.href)
                      ? "bg-primary/10 text-primary"
                      : "text-text-muted hover:bg-surface/50 hover:text-text-main"
                  )}
                >
                  <span
                    className={cn(
                      "material-symbols-outlined text-[18px]",
                      isActive(item.href) ? "fill-1" : "group-hover:text-primary transition-colors"
                    )}
                  >
                    {item.icon}
                  </span>
                  <span className="text-sm font-medium">{item.label}</span>
                </Link>
              ))}
            </div>

          {/* System section */}
          <div className="pt-4 mt-2">
            <p className="px-4 text-xs font-semibold text-text-muted/60 uppercase tracking-wider mb-2">
              System
            </p>
            {systemItems.map((item) => (
              <Link
                key={item.href}
                href={item.href}
                onClick={onClose}
                className={cn(
                  "flex items-center gap-3 px-4 py-2 rounded-lg transition-all group",
                  isActive(item.href)
                    ? "bg-primary/10 text-primary"
                    : "text-text-muted hover:bg-surface/50 hover:text-text-main"
                )}
              >
                <span
                  className={cn(
                    "material-symbols-outlined text-[18px]",
                    isActive(item.href) ? "fill-1" : "group-hover:text-primary transition-colors"
                  )}
                >
                  {item.icon}
                </span>
                <span className="text-sm font-medium">{item.label}</span>
              </Link>
            ))}
          </div>
        </nav>

        {/* Footer section */}
        <div className="p-3 border-t border-black/5 dark:border-white/5">
          {/* Info message */}
          <div className="flex items-start gap-2 p-2 rounded-lg bg-surface/50 mb-2">
            <div className="flex items-center justify-center size-6 rounded-md bg-blue-500/10 text-blue-500 shrink-0 mt-0.5">
              <span className="material-symbols-outlined text-[14px]">info</span>
            </div>
            <div className="flex flex-col">
              <span className="text-xs font-medium text-text-main leading-relaxed">
                Service is running in terminal. You can close this web page. Shutdown will stop the service.
              </span>
            </div>
          </div>

          {/* Shutdown button */}
          <Button
            variant="outline"
            fullWidth
            icon="power_settings_new"
            onClick={() => setShowShutdownModal(true)}
            className="text-red-500 border-red-200 hover:bg-red-50 hover:border-red-300"
          >
            Shutdown
          </Button>
        </div>
      </aside>

      {/* Shutdown Confirmation Modal */}
      <ConfirmModal
        isOpen={showShutdownModal}
        onClose={() => setShowShutdownModal(false)}
        onConfirm={handleShutdown}
        title="Close Proxy"
        message="Are you sure you want to close the proxy server?"
        confirmText="Close"
        cancelText="Cancel"
        variant="danger"
        loading={isShuttingDown}
      />

      {/* Disconnected Overlay */}
      {isDisconnected && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/80 backdrop-blur-sm">
          <div className="text-center p-8">
            <div className="flex items-center justify-center size-16 rounded-full bg-red-500/20 text-red-500 mx-auto mb-4">
              <span className="material-symbols-outlined text-[32px]">power_off</span>
            </div>
            <h2 className="text-xl font-semibold text-white mb-2">Server Disconnected</h2>
            <p className="text-text-muted mb-6">The proxy server has been stopped.</p>
            <Button variant="secondary" onClick={() => globalThis.location.reload()}>
              Reload Page
            </Button>
          </div>
        </div>
      )}
    </>
  );
}

Sidebar.propTypes = {
  onClose: PropTypes.func,
};