'use client'

import { useState, useEffect } from 'react'
import Link from 'next/link'
import { Bot, Activity, Brain, Settings, FileText, BarChart3, Clock, AlertTriangle, CheckCircle, Pause, XCircle, ChevronRight, Cpu, MessageSquare, Database, RefreshCw } from 'lucide-react'

// Agent types
interface AgentConfig {
  id: string
  name: string
  description: string
  soulFile: string
  color: string
  icon: 'bot' | 'brain' | 'message' | 'alert' | 'settings'
  status: 'running' | 'paused' | 'stopped' | 'error'
  activeSessions: number
  totalProcessed: number
  avgResponseTime: number
  lastActivity: string
}

interface AgentStats {
  totalSessions: number
  activeSessions: number
  totalMessages: number
  avgLatency: number
  errorRate: number
  memoryUsage: number
}

// Mock data - In production, fetch from API
const mockAgents: AgentConfig[] = [
  {
    id: 'tutor-agent',
    name: 'TutorAgent',
    description: 'Lernbegleitung und Fragen beantworten',
    soulFile: 'tutor-agent.soul.md',
    color: '#3b82f6',
    icon: 'brain',
    status: 'running',
    activeSessions: 12,
    totalProcessed: 1847,
    avgResponseTime: 234,
    lastActivity: '2 min ago'
  },
  {
    id: 'grader-agent',
    name: 'GraderAgent',
    description: 'Klausur-Korrektur und Bewertung',
    soulFile: 'grader-agent.soul.md',
    color: '#10b981',
    icon: 'bot',
    status: 'running',
    activeSessions: 3,
    totalProcessed: 456,
    avgResponseTime: 1205,
    lastActivity: '5 min ago'
  },
  {
    id: 'quality-judge',
    name: 'QualityJudge',
    description: 'BQAS Qualitaetspruefung',
    soulFile: 'quality-judge.soul.md',
    color: '#f59e0b',
    icon: 'settings',
    status: 'running',
    activeSessions: 8,
    totalProcessed: 3291,
    avgResponseTime: 89,
    lastActivity: '1 min ago'
  },
  {
    id: 'alert-agent',
    name: 'AlertAgent',
    description: 'Monitoring und Benachrichtigungen',
    soulFile: 'alert-agent.soul.md',
    color: '#ef4444',
    icon: 'alert',
    status: 'running',
    activeSessions: 1,
    totalProcessed: 892,
    avgResponseTime: 45,
    lastActivity: '30 sec ago'
  },
  {
    id: 'orchestrator',
    name: 'Orchestrator',
    description: 'Task-Koordination und Routing',
    soulFile: 'orchestrator.soul.md',
    color: '#8b5cf6',
    icon: 'message',
    status: 'running',
    activeSessions: 24,
    totalProcessed: 8934,
    avgResponseTime: 12,
    lastActivity: 'just now'
  }
]

const mockStats: AgentStats = {
  totalSessions: 156,
  activeSessions: 48,
  totalMessages: 15420,
  avgLatency: 156,
  errorRate: 0.8,
  memoryUsage: 67
}

function getIconComponent(icon: string, className: string) {
  switch(icon) {
    case 'bot': return <Bot className={className} />
    case 'brain': return <Brain className={className} />
    case 'message': return <MessageSquare className={className} />
    case 'alert': return <AlertTriangle className={className} />
    case 'settings': return <Settings className={className} />
    default: return <Bot className={className} />
  }
}

function getStatusIcon(status: string) {
  switch(status) {
    case 'running': return <CheckCircle className="w-4 h-4 text-green-500" />
    case 'paused': return <Pause className="w-4 h-4 text-yellow-500" />
    case 'stopped': return <XCircle className="w-4 h-4 text-gray-500" />
    case 'error': return <AlertTriangle className="w-4 h-4 text-red-500" />
    default: return null
  }
}

function getStatusColor(status: string) {
  switch(status) {
    case 'running': return 'bg-green-500/10 text-green-600 border-green-500/20'
    case 'paused': return 'bg-yellow-500/10 text-yellow-600 border-yellow-500/20'
    case 'stopped': return 'bg-gray-500/10 text-gray-600 border-gray-500/20'
    case 'error': return 'bg-red-500/10 text-red-600 border-red-500/20'
    default: return 'bg-gray-500/10 text-gray-600 border-gray-500/20'
  }
}

export default function AgentManagementPage() {
  const [agents, setAgents] = useState<AgentConfig[]>(mockAgents)
  const [stats, setStats] = useState<AgentStats>(mockStats)
  const [loading, setLoading] = useState(false)
  const [lastRefresh, setLastRefresh] = useState(new Date())

  const refreshData = async () => {
    setLoading(true)
    // In production, fetch from API
    // const response = await fetch('/api/admin/agents/status')
    await new Promise(resolve => setTimeout(resolve, 500))
    setLastRefresh(new Date())
    setLoading(false)
  }

  useEffect(() => {
    // Auto-refresh every 30 seconds
    const interval = setInterval(refreshData, 30000)
    return () => clearInterval(interval)
  }, [])

  return (
    <div className="p-6 max-w-7xl mx-auto">
      {/* Header */}
      <div className="flex items-center justify-between mb-8">
        <div>
          <h1 className="text-2xl font-bold text-gray-900 flex items-center gap-3">
            <div className="p-2 bg-teal-100 rounded-lg">
              <Bot className="w-6 h-6 text-teal-600" />
            </div>
            Agent Management
          </h1>
          <p className="text-gray-500 mt-1">
            Multi-Agent System verwalten, SOUL-Files bearbeiten, Statistiken analysieren
          </p>
        </div>
        <div className="flex items-center gap-3">
          <span className="text-sm text-gray-500">
            Letzte Aktualisierung: {lastRefresh.toLocaleTimeString('de-DE')}
          </span>
          <button
            onClick={refreshData}
            disabled={loading}
            className="flex items-center gap-2 px-4 py-2 bg-teal-600 text-white rounded-lg hover:bg-teal-700 transition-colors disabled:opacity-50"
          >
            <RefreshCw className={`w-4 h-4 ${loading ? 'animate-spin' : ''}`} />
            Aktualisieren
          </button>
        </div>
      </div>

      {/* Quick Links */}
      <div className="grid grid-cols-1 md:grid-cols-4 gap-4 mb-8">
        <Link
          href="/ai/agents/architecture"
          className="flex items-center gap-3 p-4 bg-white border border-gray-200 rounded-xl hover:border-teal-300 hover:shadow-md transition-all group"
        >
          <div className="p-2 bg-purple-100 rounded-lg group-hover:bg-purple-200 transition-colors">
            <FileText className="w-5 h-5 text-purple-600" />
          </div>
          <div>
            <div className="font-medium text-gray-900">Architektur</div>
            <div className="text-sm text-gray-500">Dokumentation & Diagramme</div>
          </div>
          <ChevronRight className="w-5 h-5 text-gray-400 ml-auto" />
        </Link>

        <Link
          href="/ai/agents/sessions"
          className="flex items-center gap-3 p-4 bg-white border border-gray-200 rounded-xl hover:border-teal-300 hover:shadow-md transition-all group"
        >
          <div className="p-2 bg-blue-100 rounded-lg group-hover:bg-blue-200 transition-colors">
            <Activity className="w-5 h-5 text-blue-600" />
          </div>
          <div>
            <div className="font-medium text-gray-900">Sessions</div>
            <div className="text-sm text-gray-500">{stats.activeSessions} aktiv</div>
          </div>
          <ChevronRight className="w-5 h-5 text-gray-400 ml-auto" />
        </Link>

        <Link
          href="/ai/agents/statistics"
          className="flex items-center gap-3 p-4 bg-white border border-gray-200 rounded-xl hover:border-teal-300 hover:shadow-md transition-all group"
        >
          <div className="p-2 bg-green-100 rounded-lg group-hover:bg-green-200 transition-colors">
            <BarChart3 className="w-5 h-5 text-green-600" />
          </div>
          <div>
            <div className="font-medium text-gray-900">Statistiken</div>
            <div className="text-sm text-gray-500">Performance & Trends</div>
          </div>
          <ChevronRight className="w-5 h-5 text-gray-400 ml-auto" />
        </Link>

        <Link
          href="/ai/test-quality"
          className="flex items-center gap-3 p-4 bg-white border border-gray-200 rounded-xl hover:border-teal-300 hover:shadow-md transition-all group"
        >
          <div className="p-2 bg-amber-100 rounded-lg group-hover:bg-amber-200 transition-colors">
            <Cpu className="w-5 h-5 text-amber-600" />
          </div>
          <div>
            <div className="font-medium text-gray-900">BQAS</div>
            <div className="text-sm text-gray-500">Qualitaetssicherung</div>
          </div>
          <ChevronRight className="w-5 h-5 text-gray-400 ml-auto" />
        </Link>
      </div>

      {/* Stats Overview */}
      <div className="grid grid-cols-2 md:grid-cols-6 gap-4 mb-8">
        <div className="bg-white border border-gray-200 rounded-xl p-4">
          <div className="text-sm text-gray-500 mb-1">Gesamt Sessions</div>
          <div className="text-2xl font-bold text-gray-900">{stats.totalSessions.toLocaleString()}</div>
        </div>
        <div className="bg-white border border-gray-200 rounded-xl p-4">
          <div className="text-sm text-gray-500 mb-1">Aktive Sessions</div>
          <div className="text-2xl font-bold text-green-600">{stats.activeSessions}</div>
        </div>
        <div className="bg-white border border-gray-200 rounded-xl p-4">
          <div className="text-sm text-gray-500 mb-1">Nachrichten (24h)</div>
          <div className="text-2xl font-bold text-gray-900">{stats.totalMessages.toLocaleString()}</div>
        </div>
        <div className="bg-white border border-gray-200 rounded-xl p-4">
          <div className="text-sm text-gray-500 mb-1">Avg. Latenz</div>
          <div className="text-2xl font-bold text-gray-900">{stats.avgLatency}ms</div>
        </div>
        <div className="bg-white border border-gray-200 rounded-xl p-4">
          <div className="text-sm text-gray-500 mb-1">Fehlerrate</div>
          <div className="text-2xl font-bold text-amber-600">{stats.errorRate}%</div>
        </div>
        <div className="bg-white border border-gray-200 rounded-xl p-4">
          <div className="text-sm text-gray-500 mb-1">Memory Usage</div>
          <div className="text-2xl font-bold text-gray-900">{stats.memoryUsage}%</div>
        </div>
      </div>

      {/* Agents Grid */}
      <div className="mb-6">
        <h2 className="text-lg font-semibold text-gray-900 mb-4">Agents</h2>
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
          {agents.map((agent) => (
            <Link
              key={agent.id}
              href={`/ai/agents/${agent.id}`}
              className="bg-white border border-gray-200 rounded-xl p-5 hover:border-teal-300 hover:shadow-lg transition-all group"
            >
              {/* Header */}
              <div className="flex items-start justify-between mb-4">
                <div className="flex items-center gap-3">
                  <div
                    className="p-2.5 rounded-lg"
                    style={{ backgroundColor: `${agent.color}20` }}
                  >
                    {getIconComponent(agent.icon, `w-5 h-5`)}
                    <style jsx>{`
                      svg { color: ${agent.color}; }
                    `}</style>
                  </div>
                  <div>
                    <h3 className="font-semibold text-gray-900 group-hover:text-teal-600 transition-colors">
                      {agent.name}
                    </h3>
                    <p className="text-sm text-gray-500">{agent.description}</p>
                  </div>
                </div>
                <div className={`flex items-center gap-1.5 px-2 py-1 rounded-full text-xs font-medium border ${getStatusColor(agent.status)}`}>
                  {getStatusIcon(agent.status)}
                  {agent.status}
                </div>
              </div>

              {/* Stats */}
              <div className="grid grid-cols-3 gap-3 mb-4">
                <div className="text-center p-2 bg-gray-50 rounded-lg">
                  <div className="text-lg font-semibold text-gray-900">{agent.activeSessions}</div>
                  <div className="text-xs text-gray-500">Sessions</div>
                </div>
                <div className="text-center p-2 bg-gray-50 rounded-lg">
                  <div className="text-lg font-semibold text-gray-900">{agent.totalProcessed}</div>
                  <div className="text-xs text-gray-500">Verarbeitet</div>
                </div>
                <div className="text-center p-2 bg-gray-50 rounded-lg">
                  <div className="text-lg font-semibold text-gray-900">{agent.avgResponseTime}ms</div>
                  <div className="text-xs text-gray-500">Avg. Zeit</div>
                </div>
              </div>

              {/* Footer */}
              <div className="flex items-center justify-between pt-3 border-t border-gray-100">
                <div className="flex items-center gap-2 text-sm text-gray-500">
                  <FileText className="w-4 h-4" />
                  {agent.soulFile}
                </div>
                <div className="flex items-center gap-1 text-sm text-gray-400">
                  <Clock className="w-3.5 h-3.5" />
                  {agent.lastActivity}
                </div>
              </div>
            </Link>
          ))}
        </div>
      </div>

      {/* Info Box */}
      <div className="bg-teal-50 border border-teal-200 rounded-xl p-5">
        <div className="flex gap-4">
          <div className="p-2 bg-teal-100 rounded-lg h-fit">
            <Brain className="w-5 h-5 text-teal-600" />
          </div>
          <div>
            <h3 className="font-semibold text-teal-900 mb-2">Multi-Agent Architektur</h3>
            <p className="text-sm text-teal-700 mb-3">
              Das Breakpilot Multi-Agent-System basiert auf dem Mission Control Konzept. Jeder Agent hat eine
              definierte Persoenlichkeit (SOUL-File), die sein Verhalten steuert. Die Agents kommunizieren
              ueber einen Message Bus und nutzen ein gemeinsames Gedaechtnis (Shared Brain).
            </p>
            <div className="flex gap-3">
              <Link
                href="/ai/agents/architecture"
                className="text-sm font-medium text-teal-600 hover:text-teal-800"
              >
                Architektur ansehen &rarr;
              </Link>
              <Link
                href="/ai/agents/architecture#soul-files"
                className="text-sm font-medium text-teal-600 hover:text-teal-800"
              >
                SOUL-Files verstehen &rarr;
              </Link>
            </div>
          </div>
        </div>
      </div>
    </div>
  )
}