import { useState, useEffect } from 'react'
import { Terminal, AlertCircle, CheckCircle, RefreshCw } from 'lucide-react'
import { api } from '../lib/api'
import { useDarkMode } from '../context/ThemeContext'

interface LogEntry {
  id: string
  timestamp: string
  level: 'info' | 'warning' | 'error' | 'success'
  message: string
  source: string
  details?: string
}

export default function LogsPage() {
  const [logs, setLogs] = useState<LogEntry[]>([])
  const [filter, setFilter] = useState<string>('all')
  const [loading, setLoading] = useState(true)
  const { theme } = useDarkMode()

  const refreshLogs = async () => {
    // Echte Ereignisse aus der Datenbank — die Mock-Einträge („The Matrix
    // gerippt") sind raus. Was hier steht, ist passiert; sonst ist es leer.
    try {
      const response = await api.get('/logs', { params: { limit: 200 } })
      setLogs(response.data)
    } catch (error) {
      console.error('Fehler beim Laden der Logs:', error)
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    refreshLogs()
    const interval = setInterval(refreshLogs, 10000)
    return () => clearInterval(interval)
  }, [])

  const getLevelColor = (level: string) => {
    switch (level) {
      case 'error': return theme === 'dark' ? 'bg-rose-900/30 text-rose-400 border-rose-700/20' : 'bg-rose-100 text-rose-700 border-rose-600/20'
      case 'warning': return theme === 'dark' ? 'bg-amber-900/30 text-amber-400 border-amber-700/20' : 'bg-amber-100 text-amber-700 border-amber-600/20'
      case 'success': return theme === 'dark' ? 'bg-emerald-900/30 text-emerald-400 border-emerald-700/20' : 'bg-emerald-100 text-emerald-700 border-emerald-600/20'
      default: return theme === 'dark' ? 'bg-blue-900/30 text-blue-400 border-blue-700/20' : 'bg-blue-100 text-blue-700 border-blue-600/20'
    }
  }

  const getLevelIcon = (level: string) => {
    switch (level) {
      case 'error': return <AlertCircle size={16} />
      case 'warning': return <AlertCircle size={16} />
      case 'success': return <CheckCircle size={16} />
      default: return <Terminal size={16} />
    }
  }

  const getLevelLabel = (level: string) => {
    switch (level) {
      case 'error': return 'Fehler'
      case 'warning': return 'Warnung'
      case 'success': return 'Erfolg'
      default: return 'Info'
    }
  }

  const filteredLogs = filter === 'all' 
    ? logs 
    : logs.filter(log => log.level === filter || log.source === filter)

  const stats = {
    info: logs.filter(l => l.level === 'info').length,
    warning: logs.filter(l => l.level === 'warning').length,
    error: logs.filter(l => l.level === 'error').length,
    success: logs.filter(l => l.level === 'success').length,
  }

  return (
    <div className="space-y-6 transition-colors duration-300">
      {/* Header */}
      <div className="flex flex-col gap-2 transition-colors duration-300">
        <h1 className="text-3xl font-bold dark:text-slate-100 text-slate-900">Logs</h1>
        <p className={`text-sm ${theme === 'dark' ? 'text-slate-400' : 'text-slate-500'}`}>Alle relevanten Log-Informationen des Ripping-Systems</p>
      </div>

      {/* Stats */}
      <div className="grid grid-cols-2 md:grid-cols-4 gap-4 transition-colors duration-300">
        <div className={`rounded-lg p-4 border transition-colors duration-300 ${theme === 'dark' ? 'bg-slate-800 border-slate-700' : 'bg-white border-slate-200'}`}>
          <div className="flex items-center gap-3 mb-2">
            <div className="p-2 rounded-lg bg-blue-500/10 text-blue-500">
              <Terminal size={18} />
            </div>
            <span className={`text-sm font-medium ${theme === 'dark' ? 'text-slate-400' : 'text-slate-500'}`}>Info</span>
          </div>
          <p className={`text-2xl font-bold ${theme === 'dark' ? 'text-slate-100' : 'text-slate-900'}`}>{stats.info}</p>
        </div>
        <div className={`rounded-lg p-4 border transition-colors duration-300 ${theme === 'dark' ? 'bg-slate-800 border-slate-700' : 'bg-white border-slate-200'}`}>
          <div className="flex items-center gap-3 mb-2">
            <div className="p-2 rounded-lg bg-amber-500/10 text-amber-500">
              <AlertCircle size={18} />
            </div>
            <span className={`text-sm font-medium ${theme === 'dark' ? 'text-slate-400' : 'text-slate-500'}`}>Warnung</span>
          </div>
          <p className={`text-2xl font-bold ${theme === 'dark' ? 'text-slate-100' : 'text-slate-900'}`}>{stats.warning}</p>
        </div>
        <div className={`rounded-lg p-4 border transition-colors duration-300 ${theme === 'dark' ? 'bg-slate-800 border-slate-700' : 'bg-white border-slate-200'}`}>
          <div className="flex items-center gap-3 mb-2">
            <div className="p-2 rounded-lg bg-emerald-500/10 text-emerald-500">
              <CheckCircle size={18} />
            </div>
            <span className={`text-sm font-medium ${theme === 'dark' ? 'text-slate-400' : 'text-slate-500'}`}>Erfolg</span>
          </div>
          <p className={`text-2xl font-bold ${theme === 'dark' ? 'text-slate-100' : 'text-slate-900'}`}>{stats.success}</p>
        </div>
        <div className={`rounded-lg p-4 border transition-colors duration-300 ${theme === 'dark' ? 'bg-slate-800 border-slate-700' : 'bg-white border-slate-200'}`}>
          <div className="flex items-center gap-3 mb-2">
            <div className="p-2 rounded-lg bg-rose-500/10 text-rose-500">
              <AlertCircle size={18} />
            </div>
            <span className={`text-sm font-medium ${theme === 'dark' ? 'text-slate-400' : 'text-slate-500'}`}>Fehler</span>
          </div>
          <p className={`text-2xl font-bold ${theme === 'dark' ? 'text-slate-100' : 'text-slate-900'}`}>{stats.error}</p>
        </div>
      </div>

      {/* Filters */}
      <div className={`rounded-lg p-4 border transition-colors duration-300 ${theme === 'dark' ? 'bg-slate-800 border-slate-700' : 'bg-white border-slate-200'}`}>
        <div className="flex flex-wrap items-center gap-3">
          <span className={`text-sm font-medium ${theme === 'dark' ? 'text-slate-400' : 'text-slate-500'}`}>Filter:</span>
          <button
            onClick={() => setFilter('all')}
            className={`px-3 py-1.5 rounded-full text-xs font-medium transition-colors ${
              filter === 'all'
                ? 'bg-indigo-600 text-white'
                : theme === 'dark' ? 'bg-slate-700 text-slate-300 hover:bg-slate-600' : 'bg-slate-100 text-slate-600 hover:bg-slate-200'
            }`}
          >
            Alle
          </button>
          <button
            onClick={() => setFilter('info')}
            className={`px-3 py-1.5 rounded-full text-xs font-medium transition-colors ${
              filter === 'info'
                ? 'bg-blue-600 text-white'
                : theme === 'dark' ? 'bg-slate-700 text-slate-300 hover:bg-slate-600' : 'bg-slate-100 text-slate-600 hover:bg-slate-200'
            }`}
          >
            Info
          </button>
          <button
            onClick={() => setFilter('success')}
            className={`px-3 py-1.5 rounded-full text-xs font-medium transition-colors ${
              filter === 'success'
                ? 'bg-emerald-600 text-white'
                : theme === 'dark' ? 'bg-slate-700 text-slate-300 hover:bg-slate-600' : 'bg-slate-100 text-slate-600 hover:bg-slate-200'
            }`}
          >
            Erfolg
          </button>
          <div className="flex-1" />
          <button
            onClick={refreshLogs}
            className={`flex items-center gap-2 px-3 py-1.5 rounded-lg text-xs font-medium transition-colors ${theme === 'dark' ? 'bg-slate-700 text-slate-300 hover:bg-slate-600' : 'bg-slate-100 text-slate-600 hover:bg-slate-200'}`}
          >
            <RefreshCw size={14} className={loading ? 'animate-spin' : ''} />
            Neu laden
          </button>
        </div>
      </div>

      {/* Logs List */}
      <div className={`rounded-lg border overflow-hidden transition-colors duration-300 ${theme === 'dark' ? 'bg-slate-800 border-slate-700' : 'bg-white border-slate-200'}`}>
        <div className="max-h-[600px] overflow-y-auto">
          {filteredLogs.length === 0 ? (
            <div className="text-center py-12 transition-colors duration-300">
              <div className={`mx-auto w-16 h-16 rounded-full flex items-center justify-center mb-4 ${theme === 'dark' ? 'bg-slate-700' : 'bg-slate-100'}`}>
                <Terminal className={theme === 'dark' ? 'text-slate-400' : 'text-slate-400'} size={32} />
              </div>
              <p className={`text-sm ${theme === 'dark' ? 'text-slate-400' : 'text-slate-500'}`}>Keine Logs gefunden</p>
            </div>
          ) : (
            <div className="divide-y divide-slate-200 dark:divide-slate-700">
              {filteredLogs.map(log => (
                <div key={log.id} className={`p-4 transition-colors duration-300 hover:${theme === 'dark' ? 'bg-slate-700/50' : 'bg-slate-50'}`}>
                  <div className="flex items-start gap-3">
                    <div className={`mt-1 p-1.5 rounded ${getLevelColor(log.level)}`}>
                      {getLevelIcon(log.level)}
                    </div>
                    <div className="flex-1 min-w-0">
                      <div className="flex items-center gap-2 mb-1 flex-wrap">
                        <span className={`text-xs font-mono px-1.5 py-0.5 rounded ${theme === 'dark' ? 'bg-slate-700 text-slate-400' : 'bg-slate-100 text-slate-600'}`}>
                          {log.source}
                        </span>
                        <span className={`text-xs font-medium ${theme === 'dark' ? 'text-slate-400' : 'text-slate-500'}`}>
                          {log.timestamp}
                        </span>
                        <span className={`text-xs font-medium px-2 py-0.5 rounded-full ${getLevelColor(log.level)}`}>
                          {getLevelLabel(log.level)}
                        </span>
                      </div>
                      <p className={`text-sm font-medium ${theme === 'dark' ? 'text-slate-100' : 'text-slate-900'}`}>
                        {log.message}
                      </p>
                      {log.details && (
                        <p className={`text-xs mt-1 font-mono ${theme === 'dark' ? 'text-slate-500' : 'text-slate-500'}`}>
                          {log.details}
                        </p>
                      )}
                    </div>
                  </div>
                </div>
              ))}
            </div>
          )}
        </div>
      </div>
    </div>
  )
}