'use client';

import { useState, useEffect } from 'react';
import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { ScrollArea } from '@/components/ui/scroll-area';

// Current app version from package.json
const APP_VERSION = '2025.07.01';

// Changelog data - add new versions at the top
const CHANGELOG = [
  {
    version: '2025.07.01',
    title: 'July New Month Update',
    changes: [
      'Integrated standalone Last.fm scrobbling support',
      'Added collapsible sidebar with icon-only mode',
      'Improved search and browsing experience',
      'Added history tracking for played songs',
      'New Library Artist Page',
      'Enhanced audio player with better controls',
      'Added settings page for customization options',
      'Introduced Whats New popup for version updates',
      'Improved UI consistency with new Badge component',
      'New Favorites page with album, song, and artist sections',
    ],
    breaking: [],
    fixes: [
      'Fixed issue with audio player not resuming playback after pause',
      'Resolved bug with search results not displaying correctly',
      'Improved performance for large libraries',
      'Fixed layout issues on smaller screens',
      'Resolved scrobbling issues with Last.fm integration'
    ]
  },
  // Example previous version
  {
    version: '2025.06.15',
    title: 'June Final Update',
    changes: [
      'Added dark mode toggle',
      'Improved playlist management',
    ],
    breaking: [],
    fixes: [
      'Fixed login bug',
    ]
  }
];

type TabType = 'latest' | 'archive';

export function WhatsNewPopup() {
  const [isOpen, setIsOpen] = useState(false);
  const [tab, setTab] = useState<TabType>('latest');
  const [selectedArchive, setSelectedArchive] = useState(CHANGELOG[1]?.version || '');

  useEffect(() => {
    const hasCompletedOnboarding = localStorage.getItem('onboarding-completed');
    if (!hasCompletedOnboarding) return;
    const lastShownVersion = localStorage.getItem('whats-new-last-shown');
    if (lastShownVersion !== APP_VERSION) {
      setIsOpen(true);
    }
  }, []);

  const handleClose = () => {
    localStorage.setItem('whats-new-last-shown', APP_VERSION);
    setIsOpen(false);
  };

  const currentVersionChangelog = CHANGELOG.find(entry => entry.version === APP_VERSION);
  const archiveChangelogs = CHANGELOG.filter(entry => entry.version !== APP_VERSION);

  // For archive, show selected version
  const archiveChangelog = archiveChangelogs.find(entry => entry.version === selectedArchive) || archiveChangelogs[0];

  if (!currentVersionChangelog) {
    return null;
  }

  const renderChangelog = (changelog: typeof CHANGELOG[0]) => (
    <div className="space-y-6">
      {changelog.title && (
        <div>
          <h3 className="text-lg font-semibold mb-2">{changelog.title}</h3>
        </div>
      )}

      {changelog.changes.length > 0 && (
        <div>
          <h4 className="text-md font-medium mb-3 flex items-center gap-2">
            ✨ New Features & Improvements
          </h4>
          <ul className="space-y-2">
            {changelog.changes.map((change, index) => (
              <li key={index} className="flex items-start gap-2">
                <span className="text-green-500 mt-1">•</span>
                <span className="text-sm">{change}</span>
              </li>
            ))}
          </ul>
        </div>
      )}

      {changelog.fixes.length > 0 && (
        <div>
          <h4 className="text-md font-medium mb-3 flex items-center gap-2">
            🐛 Bug Fixes
          </h4>
          <ul className="space-y-2">
            {changelog.fixes.map((fix, index) => (
              <li key={index} className="flex items-start gap-2">
                <span className="text-blue-500 mt-1">•</span>
                <span className="text-sm">{fix}</span>
              </li>
            ))}
          </ul>
        </div>
      )}

      {changelog.breaking.length > 0 && (
        <div>
          <h4 className="text-md font-medium mb-3 flex items-center gap-2">
            ⚠️ Breaking Changes
          </h4>
          <ul className="space-y-2">
            {changelog.breaking.map((breaking, index) => (
              <li key={index} className="flex items-start gap-2">
                <span className="text-red-500 mt-1">•</span>
                <span className="text-sm">{breaking}</span>
              </li>
            ))}
          </ul>
        </div>
      )}
    </div>
  );

  return (
    <Dialog open={isOpen} onOpenChange={handleClose}>
      <DialogContent className="max-w-2xl max-h-[80vh]">
        <DialogHeader className="flex flex-row items-center justify-between space-y-0 pb-4">
          <div>
            <DialogTitle className="text-2xl font-bold flex items-center gap-2">
              What&apos;s New in Mice
              <Badge variant="outline">
                {tab === 'latest' ? currentVersionChangelog.version : archiveChangelog?.version}
              </Badge>
            </DialogTitle>
          </div>
        </DialogHeader>

        {/* Tabs */}
        <div className="flex gap-2 mb-4">
          <Button
            variant={tab === 'latest' ? 'default' : 'outline'}
            size="sm"
            onClick={() => setTab('latest')}
          >
            Latest
          </Button>
          <Button
            variant={tab === 'archive' ? 'default' : 'outline'}
            size="sm"
            onClick={() => setTab('archive')}
            disabled={archiveChangelogs.length === 0}
          >
            Archive
          </Button>
          {tab === 'archive' && archiveChangelogs.length > 0 && (
            <select
              className="ml-2 border rounded px-2 py-1 text-sm"
              value={selectedArchive}
              onChange={e => setSelectedArchive(e.target.value)}
            >
              {archiveChangelogs.map(entry => (
                <option key={entry.version} value={entry.version}>
                  {entry.version}
                </option>
              ))}
            </select>
          )}
        </div>

        <ScrollArea className="max-h-[60vh] pr-4">
          {tab === 'latest'
            ? renderChangelog(currentVersionChangelog)
            : archiveChangelog && renderChangelog(archiveChangelog)}
        </ScrollArea>

        <div className="flex justify-center pt-4">
          <Button onClick={handleClose}>
            Got it!
          </Button>
        </div>
      </DialogContent>
    </Dialog>
  );
}