'use client';

import { ChevronDown, Download, Server } from 'lucide-react';
import { useEffect, useMemo, useState } from 'react';
import { createInstallOptions, type InstallOption } from '@/lib/downloadLinks';
import { fetchLatestReleaseInfo } from '@/lib/latestRelease';

type InstallTabsProps = {
  lang: 'en' | 'cn';
  version: string;
};

const downloadLabel = { en: 'Download DBX', cn: '下载 DBX' };

const platformIconPaths = {
  dark: {
    'linux-arm': '/icons/platform/linux.svg',
    linux: '/icons/platform/linux.svg',
    'macos-arm': '/icons/platform/macos.png',
    'macos-intel': '/icons/platform/macos.png',
    windows: '/icons/platform/windows.png',
  },
  light: {
    'linux-arm': '/icons/platform/linux.svg',
    linux: '/icons/platform/linux.svg',
    'macos-arm': '/icons/platform/macos-white.png',
    'macos-intel': '/icons/platform/macos-white.png',
    windows: '/icons/platform/windows.png',
  },
};

function detectPlatformId(): string {
  if (typeof navigator === 'undefined') return 'macos-arm';
  const ua = navigator.userAgent.toLowerCase();
  if (ua.includes('win')) return 'windows';
  if (ua.includes('linux')) return ua.includes('aarch64') || ua.includes('arm') ? 'linux-arm' : 'linux';
  return 'macos-arm';
}

function PlatformIcon({ id, size, variant }: { id: string; size: number; variant: 'dark' | 'light' }) {
  const src = platformIconPaths[variant][id as keyof (typeof platformIconPaths)['dark']];
  if (!src) return <Server size={size} />;
  return <img alt="" aria-hidden="true" height={size} src={src} width={size} />;
}

export function InstallTabs({ lang, version }: InstallTabsProps) {
  const [downloadVersion, setDownloadVersion] = useState(version);
  const options = useMemo(() => createInstallOptions(lang, downloadVersion), [lang, downloadVersion]);
  const [open, setOpen] = useState(false);
  const [platformId, setPlatformId] = useState('macos-arm');

  useEffect(() => {
    setPlatformId(detectPlatformId());
  }, []);

  useEffect(() => {
    let active = true;

    setDownloadVersion(version);
    fetchLatestReleaseInfo().then((release) => {
      if (active && release?.version) {
        setDownloadVersion(release.version);
      }
    });

    return () => {
      active = false;
    };
  }, [version]);

  const primary = useMemo(() => options.find((o) => o.id === platformId) ?? options[0], [options, platformId]);
  const menuOptions = useMemo(() => options.filter((o) => o.id !== platformId), [options, platformId]);

  return (
    <div
      className="landing-install relative z-20 block w-fit max-w-full mx-auto"
      data-open={open}
      onBlur={(event) => {
        if (!event.currentTarget.contains(event.relatedTarget)) {
          setOpen(false);
        }
      }}
      onMouseEnter={() => setOpen(true)}
      onMouseLeave={() => setOpen(false)}
    >
      <a
        aria-controls="landing-install-menu"
        aria-expanded={open}
        aria-haspopup="listbox"
        className="landing-install-trigger grid grid-cols-[auto_minmax(0,1fr)_auto] gap-4 items-center w-[min(340px,calc(100vw-48px))] min-h-[68px] border-0 rounded-full mx-auto px-6 cursor-pointer"
        href={primary.href}
        onFocus={() => setOpen(true)}
      >
        <PlatformIcon id={primary.id} size={30} variant="dark" />
        <span className="grid gap-0.5 min-w-0">
          <strong className="overflow-hidden text-[15px] font-[780] leading-[1.2] truncate">{downloadLabel[lang]}</strong>
          <small className="overflow-hidden text-xs font-[520] leading-tight truncate text-[color-mix(in_srgb,#0f172a_48%,#94a3b8)]">{primary.label}</small>
        </span>
        <ChevronDown size={18} />
      </a>
      <div
        className="landing-install-menu absolute z-30 top-[calc(100%+12px)] left-1/2 -translate-x-1/2 grid w-[min(300px,calc(100vw-48px))] border border-[rgba(155,176,205,0.17)] rounded-xl py-1.5"
        id="landing-install-menu"
        role="listbox"
        aria-label={lang === 'cn' ? '下载选项' : 'Download options'}
      >
        {menuOptions.map((item) => (
          <a
            aria-selected="false"
            className="landing-install-option grid grid-cols-[24px_minmax(0,1fr)_18px] gap-3 items-center min-w-0 border-0 px-[18px] py-3 bg-transparent text-left cursor-pointer"
            href={item.href}
            key={item.id}
            role="option"
          >
            <PlatformIcon id={item.id} size={20} variant="light" />
            <strong className="overflow-hidden text-sm font-[640] leading-[1.2] truncate">{item.label}</strong>
            <Download size={15} aria-hidden="true" />
          </a>
        ))}
      </div>
    </div>
  );
}