'use client'

/**
 * Mac Mini Control Admin Page
 *
 * Headless Mac Mini Server Management
 * - Power Controls (Wake-on-LAN, Restart, Shutdown)
 * - Docker Container Management
 * - Ollama LLM Model Management
 * - System Status Monitoring
 */

import AdminLayout from '@/components/admin/AdminLayout'
import { useEffect, useState, useCallback, useRef } from 'react'
import type { MacMiniStatus, DownloadProgress } from './types'
import { API_BASE } from './constants'
import PowerControls from './_components/PowerControls'
import InternetStatus from './_components/InternetStatus'
import DockerSection from './_components/DockerSection'
import OllamaSection from './_components/OllamaSection'

export default function MacMiniControlPage() {
  const [status, setStatus] = useState<MacMiniStatus | null>(null)
  const [loading, setLoading] = useState(true)
  const [actionLoading, setActionLoading] = useState<string | null>(null)
  const [error, setError] = useState<string | null>(null)
  const [message, setMessage] = useState<string | null>(null)
  const [downloadProgress, setDownloadProgress] = useState<DownloadProgress | null>(null)
  const [modelInput, setModelInput] = useState('')
  const eventSourceRef = useRef<EventSource | null>(null)

  const fetchStatus = useCallback(async () => {
    setLoading(true)
    setError(null)
    try {
      const response = await fetch(`${API_BASE}/status`)
      const data = await response.json()
      if (!response.ok) throw new Error(data.detail || `HTTP ${response.status}`)
      setStatus(data)
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Verbindungsfehler')
      setStatus({
        online: false, ping: false, ssh: false, docker: false,
        ollama: false, internet: false, ip: '192.168.178.100',
        error: 'Verbindung fehlgeschlagen'
      })
    } finally {
      setLoading(false)
    }
  }, [])

  useEffect(() => { fetchStatus() }, [fetchStatus])
  useEffect(() => {
    const interval = setInterval(fetchStatus, 30000)
    return () => clearInterval(interval)
  }, [fetchStatus])

  const performAction = async (action: string, endpoint: string, confirmMsg?: string) => {
    if (confirmMsg && !confirm(confirmMsg)) return
    setActionLoading(action)
    setError(null)
    setMessage(null)
    try {
      const response = await fetch(`${API_BASE}/${endpoint}`, { method: 'POST' })
      const data = await response.json()
      if (!response.ok) throw new Error(data.detail || `${action} fehlgeschlagen`)
      return data
    } catch (err) {
      setError(err instanceof Error ? err.message : `Fehler bei ${action}`)
      return null
    } finally {
      setActionLoading(null)
    }
  }

  const wakeOnLan = async () => {
    const result = await performAction('wake', 'wake')
    if (result) {
      setMessage('Wake-on-LAN Paket gesendet')
      setTimeout(fetchStatus, 5000)
      setTimeout(fetchStatus, 15000)
    }
  }

  const restart = async () => {
    const result = await performAction('restart', 'restart', 'Mac Mini wirklich neu starten?')
    if (result) {
      setMessage('Neustart eingeleitet')
      setTimeout(fetchStatus, 30000)
    }
  }

  const shutdown = async () => {
    const result = await performAction('shutdown', 'shutdown', 'Mac Mini wirklich herunterfahren?')
    if (result) {
      setMessage('Shutdown eingeleitet')
      setTimeout(fetchStatus, 10000)
    }
  }

  const dockerUp = async () => {
    const result = await performAction('docker-up', 'docker/up')
    if (result) {
      setMessage('Docker Container werden gestartet...')
      setTimeout(fetchStatus, 5000)
    }
  }

  const dockerDown = async () => {
    const result = await performAction('docker-down', 'docker/down', 'Docker Container wirklich stoppen?')
    if (result) {
      setMessage('Docker Container werden gestoppt...')
      setTimeout(fetchStatus, 5000)
    }
  }

  const pullModel = async () => {
    if (!modelInput.trim()) return
    setActionLoading('pull')
    setError(null)
    setMessage(null)
    setDownloadProgress({ model: modelInput, status: 'starting', completed: 0, total: 0, percent: 0 })

    try {
      if (eventSourceRef.current) eventSourceRef.current.close()

      const response = await fetch(`${API_BASE}/ollama/pull`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ model: modelInput })
      })

      if (!response.ok) {
        const data = await response.json()
        throw new Error(data.detail || 'Model Pull fehlgeschlagen')
      }

      const reader = response.body?.getReader()
      const decoder = new TextDecoder()

      if (reader) {
        while (true) {
          const { done, value } = await reader.read()
          if (done) break
          const text = decoder.decode(value)
          const lines = text.split('\n').filter(line => line.trim())
          for (const line of lines) {
            try {
              const data = JSON.parse(line)
              if (data.status === 'downloading' && data.total) {
                setDownloadProgress({
                  model: modelInput, status: data.status,
                  completed: data.completed || 0, total: data.total,
                  percent: Math.round((data.completed || 0) / data.total * 100)
                })
              } else if (data.status === 'success') {
                setMessage(`Modell ${modelInput} erfolgreich heruntergeladen`)
                setDownloadProgress(null)
                setModelInput('')
                fetchStatus()
              } else if (data.error) {
                throw new Error(data.error)
              }
            } catch (e) { /* Skip parsing errors for incomplete chunks */ }
          }
        }
      }
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Fehler beim Model Download')
      setDownloadProgress(null)
    } finally {
      setActionLoading(null)
    }
  }

  return (
    <AdminLayout title="Mac Mini Control" description="Headless Server Management">
      <PowerControls
        status={status}
        loading={loading}
        actionLoading={actionLoading}
        message={message}
        error={error}
        onWake={wakeOnLan}
        onRestart={restart}
        onShutdown={shutdown}
        onRefresh={fetchStatus}
      />

      <InternetStatus internet={status?.internet} />

      <DockerSection
        status={status}
        actionLoading={actionLoading}
        onDockerUp={dockerUp}
        onDockerDown={dockerDown}
      />

      <OllamaSection
        status={status}
        actionLoading={actionLoading}
        downloadProgress={downloadProgress}
        modelInput={modelInput}
        setModelInput={setModelInput}
        onPullModel={pullModel}
      />

      {/* Info */}
      <div className="mt-6 bg-blue-50 border border-blue-200 rounded-xl p-4">
        <div className="flex gap-3">
          <svg className="w-5 h-5 text-blue-600 flex-shrink-0 mt-0.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
          </svg>
          <div>
            <h4 className="font-semibold text-blue-900">Mac Mini Headless Server</h4>
            <p className="text-sm text-blue-800 mt-1">
              Der Mac Mini läuft ohne Monitor im LAN (192.168.178.100). Er hostet Docker-Container
              für das Backend, Ollama für lokale LLM-Verarbeitung und weitere Services.
              Wake-on-LAN ermöglicht das Remote-Einschalten.
            </p>
          </div>
        </div>
      </div>
    </AdminLayout>
  )
}