import { useState } from "react";
import Layout from "@/components/Layout";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import {
  Calendar,
  Search,
  Filter,
  Plus,
  Bug,
  Zap,
  Shield,
  Code,
  Database,
  Users,
  Settings,
  Globe,
  BookOpen,
  Monitor,
  Network,
  Palette,
  CheckCircle,
  AlertTriangle,
  Info,
  ArrowUpRight,
  Github,
  ExternalLink,
  Bell,
} from "lucide-react";

interface ChangelogEntry {
  id: string;
  version: string;
  date: string;
  type: 'major' | 'minor' | 'patch';
  category: string;
  title: string;
  description: string;
  changes: ChangelogItem[];
  author: string;
  pullRequest?: string;
}

interface ChangelogItem {
  type: 'added' | 'improved' | 'fixed' | 'removed' | 'security';
  description: string;
  impact: 'high' | 'medium' | 'low';
}

const changelogEntries: ChangelogEntry[] = [
  {
    id: "v1.2.0",
    version: "1.2.0",
    date: "2025-01-08",
    type: "major",
    category: "Platform Enhancement",
    title: "Major Platform Improvements & New Features",
    description: "Comprehensive platform upgrade with new dashboard features, improved user experience, and enhanced system monitoring capabilities.",
    author: "AeThex Development Team",
    pullRequest: "#121e8c26",
    changes: [
      {
        type: "added",
        description: "New comprehensive Profile system with overseer dashboard and cross-site communication monitoring",
        impact: "high"
      },
      {
        type: "added", 
        description: "System Status page with real-time monitoring of all AeThex services and infrastructure",
        impact: "high"
      },
      {
        type: "added",
        description: "Comprehensive Tutorials library with categorized learning content and filtering capabilities",
        impact: "medium"
      },
      {
        type: "added",
        description: "Nested Documentation routing system with improved navigation and breadcrumbs",
        impact: "medium"
      },
      {
        type: "added",
        description: "Documentation-specific tutorials section with interactive content types",
        impact: "medium"
      },
      {
        type: "added",
        description: "Login access options on onboarding page to prevent duplicate account creation",
        impact: "medium"
      },
      {
        type: "improved",
        description: "Enhanced navigation system with user-specific menu items when authenticated",
        impact: "medium"
      },
      {
        type: "improved",
        description: "Dashboard user interface with proper profile data integration and XP progression",
        impact: "medium"
      },
      {
        type: "improved",
        description: "Authentication flow with better error handling and redirect logic",
        impact: "high"
      },
      {
        type: "fixed",
        description: "Resolved Dashboard infinite loading screen issue when accessing without authentication",
        impact: "high"
      },
      {
        type: "fixed",
        description: "Fixed toast notification bouncing animations that were causing UI disruption",
        impact: "medium"
      },
      {
        type: "fixed",
        description: "Corrected database adapter table name mismatches and TypeScript compilation errors",
        impact: "high"
      },
      {
        type: "fixed",
        description: "Resolved DNS configuration issues for custom domain deployment",
        impact: "medium"
      },
      {
        type: "fixed",
        description: "Fixed user profile property access issues throughout the application",
        impact: "medium"
      },
      {
        type: "security",
        description: "Enhanced authentication redirect security with proper session handling",
        impact: "high"
      }
    ]
  }
];

const getTypeIcon = (type: string) => {
  switch (type) {
    case 'added': return <Plus className="h-4 w-4 text-green-500" />;
    case 'improved': return <ArrowUpRight className="h-4 w-4 text-blue-500" />;
    case 'fixed': return <Bug className="h-4 w-4 text-orange-500" />;
    case 'removed': return <AlertTriangle className="h-4 w-4 text-red-500" />;
    case 'security': return <Shield className="h-4 w-4 text-purple-500" />;
    default: return <Info className="h-4 w-4 text-gray-500" />;
  }
};

const getTypeColor = (type: string) => {
  switch (type) {
    case 'added': return 'bg-green-500';
    case 'improved': return 'bg-blue-500';
    case 'fixed': return 'bg-orange-500';
    case 'removed': return 'bg-red-500';
    case 'security': return 'bg-purple-500';
    default: return 'bg-gray-500';
  }
};

const getVersionBadgeColor = (type: string) => {
  switch (type) {
    case 'major': return 'bg-purple-600';
    case 'minor': return 'bg-blue-600';
    case 'patch': return 'bg-green-600';
    default: return 'bg-gray-600';
  }
};

const getImpactColor = (impact: string) => {
  switch (impact) {
    case 'high': return 'text-red-400';
    case 'medium': return 'text-yellow-400';
    case 'low': return 'text-green-400';
    default: return 'text-gray-400';
  }
};

export default function Changelog() {
  const [searchTerm, setSearchTerm] = useState("");
  const [selectedType, setSelectedType] = useState("all");
  const [selectedCategory, setSelectedCategory] = useState("all");

  const filteredEntries = changelogEntries.filter(entry => {
    const matchesSearch = entry.title.toLowerCase().includes(searchTerm.toLowerCase()) ||
                         entry.description.toLowerCase().includes(searchTerm.toLowerCase()) ||
                         entry.changes.some(change => 
                           change.description.toLowerCase().includes(searchTerm.toLowerCase())
                         );
    const matchesType = selectedType === "all" || entry.type === selectedType;
    const matchesCategory = selectedCategory === "all" || 
                           entry.category.toLowerCase().replace(/\s+/g, '-') === selectedCategory;
    
    return matchesSearch && matchesType && matchesCategory;
  });

  const categories = ["all", "platform-enhancement", "security", "performance", "ui-ux"];
  const types = ["all", "major", "minor", "patch"];

  return (
    <Layout>
      <div className="min-h-screen bg-gradient-to-br from-slate-900 via-purple-900 to-slate-900">
        <div className="container mx-auto px-4 py-8">
          {/* Header */}
          <div className="mb-8">
            <div className="flex items-center justify-between mb-6">
              <div>
                <h1 className="text-4xl font-bold text-white mb-4">
                  AeThex Changelog
                </h1>
                <p className="text-xl text-gray-300">
                  Track the latest updates, improvements, and fixes to the AeThex platform
                </p>
              </div>
              <div className="flex items-center space-x-4">
                <Button variant="outline" className="border-slate-600 text-white hover:bg-slate-800">
                  <Github className="h-4 w-4 mr-2" />
                  View on GitHub
                </Button>
                <Button className="bg-purple-600 hover:bg-purple-700">
                  <ExternalLink className="h-4 w-4 mr-2" />
                  Release Notes
                </Button>
              </div>
            </div>
            
            {/* Stats */}
            <div className="grid grid-cols-1 md:grid-cols-4 gap-4 mb-6">
              <Card className="bg-slate-800/50 border-slate-700">
                <CardContent className="p-4">
                  <div className="flex items-center justify-between">
                    <div>
                      <p className="text-sm text-gray-400">Total Releases</p>
                      <p className="text-2xl font-bold text-white">{changelogEntries.length}</p>
                    </div>
                    <Calendar className="h-8 w-8 text-purple-400" />
                  </div>
                </CardContent>
              </Card>
              
              <Card className="bg-slate-800/50 border-slate-700">
                <CardContent className="p-4">
                  <div className="flex items-center justify-between">
                    <div>
                      <p className="text-sm text-gray-400">New Features</p>
                      <p className="text-2xl font-bold text-green-400">
                        {changelogEntries.reduce((acc, entry) => 
                          acc + entry.changes.filter(c => c.type === 'added').length, 0
                        )}
                      </p>
                    </div>
                    <Plus className="h-8 w-8 text-green-400" />
                  </div>
                </CardContent>
              </Card>
              
              <Card className="bg-slate-800/50 border-slate-700">
                <CardContent className="p-4">
                  <div className="flex items-center justify-between">
                    <div>
                      <p className="text-sm text-gray-400">Bug Fixes</p>
                      <p className="text-2xl font-bold text-orange-400">
                        {changelogEntries.reduce((acc, entry) => 
                          acc + entry.changes.filter(c => c.type === 'fixed').length, 0
                        )}
                      </p>
                    </div>
                    <Bug className="h-8 w-8 text-orange-400" />
                  </div>
                </CardContent>
              </Card>
              
              <Card className="bg-slate-800/50 border-slate-700">
                <CardContent className="p-4">
                  <div className="flex items-center justify-between">
                    <div>
                      <p className="text-sm text-gray-400">Improvements</p>
                      <p className="text-2xl font-bold text-blue-400">
                        {changelogEntries.reduce((acc, entry) => 
                          acc + entry.changes.filter(c => c.type === 'improved').length, 0
                        )}
                      </p>
                    </div>
                    <Zap className="h-8 w-8 text-blue-400" />
                  </div>
                </CardContent>
              </Card>
            </div>

            {/* Filters */}
            <div className="flex flex-col lg:flex-row gap-4 mb-6">
              <div className="flex-1">
                <div className="relative">
                  <Search className="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-400 h-4 w-4" />
                  <Input
                    placeholder="Search changelog entries..."
                    value={searchTerm}
                    onChange={(e) => setSearchTerm(e.target.value)}
                    className="pl-10 bg-slate-800/50 border-slate-600 text-white"
                  />
                </div>
              </div>
              <div className="flex gap-2">
                <select
                  value={selectedType}
                  onChange={(e) => setSelectedType(e.target.value)}
                  className="bg-slate-800/50 border-slate-600 text-white rounded-md px-3 py-2"
                >
                  {types.map(type => (
                    <option key={type} value={type}>
                      {type === 'all' ? 'All Types' : type.charAt(0).toUpperCase() + type.slice(1)}
                    </option>
                  ))}
                </select>
                <select
                  value={selectedCategory}
                  onChange={(e) => setSelectedCategory(e.target.value)}
                  className="bg-slate-800/50 border-slate-600 text-white rounded-md px-3 py-2"
                >
                  {categories.map(category => (
                    <option key={category} value={category}>
                      {category === 'all' ? 'All Categories' : 
                       category.split('-').map(word => 
                         word.charAt(0).toUpperCase() + word.slice(1)
                       ).join(' ')
                      }
                    </option>
                  ))}
                </select>
              </div>
            </div>
          </div>

          {/* Changelog Entries */}
          <div className="space-y-8">
            {filteredEntries.map((entry, index) => (
              <Card key={entry.id} className="bg-slate-800/50 border-slate-700 hover:border-purple-500/50 transition-all duration-300">
                <CardHeader>
                  <div className="flex items-start justify-between mb-4">
                    <div className="flex items-center space-x-4">
                      <Badge className={`${getVersionBadgeColor(entry.type)} text-white border-0 px-3 py-1`}>
                        v{entry.version}
                      </Badge>
                      <Badge variant="outline" className="text-gray-300">
                        {entry.category}
                      </Badge>
                      <div className="flex items-center text-sm text-gray-400">
                        <Calendar className="h-4 w-4 mr-1" />
                        {new Date(entry.date).toLocaleDateString('en-US', {
                          year: 'numeric',
                          month: 'long',
                          day: 'numeric'
                        })}
                      </div>
                    </div>
                    {entry.pullRequest && (
                      <Button variant="ghost" size="sm" className="text-gray-400 hover:text-white">
                        <Github className="h-4 w-4 mr-1" />
                        {entry.pullRequest}
                      </Button>
                    )}
                  </div>
                  
                  <CardTitle className="text-2xl text-white">
                    {entry.title}
                  </CardTitle>
                  <CardDescription className="text-gray-300 text-base">
                    {entry.description}
                  </CardDescription>
                  
                  <div className="flex items-center text-sm text-gray-400 mt-2">
                    <Users className="h-4 w-4 mr-1" />
                    By {entry.author}
                  </div>
                </CardHeader>
                
                <CardContent>
                  <div className="space-y-4">
                    {/* Group changes by type */}
                    {['added', 'improved', 'fixed', 'security', 'removed'].map(changeType => {
                      const changesOfType = entry.changes.filter(change => change.type === changeType);
                      if (changesOfType.length === 0) return null;
                      
                      return (
                        <div key={changeType} className="space-y-3">
                          <div className="flex items-center space-x-2">
                            {getTypeIcon(changeType)}
                            <h4 className="font-semibold text-white capitalize">
                              {changeType} ({changesOfType.length})
                            </h4>
                          </div>
                          <ul className="space-y-2 ml-6">
                            {changesOfType.map((change, changeIndex) => (
                              <li key={changeIndex} className="flex items-start space-x-3">
                                <div className={`w-2 h-2 rounded-full ${getTypeColor(change.type)} mt-2 flex-shrink-0`} />
                                <div className="flex-1">
                                  <p className="text-gray-300">{change.description}</p>
                                  <Badge 
                                    variant="outline" 
                                    className={`mt-1 text-xs ${getImpactColor(change.impact)} border-current`}
                                  >
                                    {change.impact} impact
                                  </Badge>
                                </div>
                              </li>
                            ))}
                          </ul>
                        </div>
                      );
                    })}
                  </div>
                </CardContent>
              </Card>
            ))}
          </div>

          {filteredEntries.length === 0 && (
            <Card className="bg-slate-800/50 border-slate-700">
              <CardContent className="p-8 text-center">
                <Search className="h-12 w-12 text-gray-400 mx-auto mb-4" />
                <h3 className="text-lg font-semibold text-white mb-2">
                  No changelog entries found
                </h3>
                <p className="text-gray-400">
                  Try adjusting your search terms or filters to find what you're looking for.
                </p>
              </CardContent>
            </Card>
          )}

          {/* Footer */}
          <div className="mt-12 text-center">
            <Card className="bg-slate-800/50 border-slate-700">
              <CardContent className="p-6">
                <h3 className="text-xl font-semibold text-white mb-2">
                  Stay Updated
                </h3>
                <p className="text-gray-300 mb-4">
                  Follow our development progress and get notified about new releases
                </p>
                <div className="flex justify-center space-x-4">
                  <Button variant="outline" className="border-slate-600 text-white hover:bg-slate-800">
                    <Github className="h-4 w-4 mr-2" />
                    Watch on GitHub
                  </Button>
                  <Button className="bg-purple-600 hover:bg-purple-700">
                    <Bell className="h-4 w-4 mr-2" />
                    Subscribe to Updates
                  </Button>
                </div>
              </CardContent>
            </Card>
          </div>
        </div>
      </div>
    </Layout>
  );
}