'use client'

/**
 * LLM Mode Switcher Component
 *
 * UI-Komponente zum Umschalten zwischen LLM-Modi:
 * - Hybrid: Lokal zuerst, Cloud als Fallback
 * - Nur Lokal: Maximaler Datenschutz (nur Ollama)
 * - Nur Cloud: Beste Qualitaet (Claude/OpenAI)
 * - Auto: Automatische Auswahl nach Komplexitaet
 *
 * Kann als standalone oder in andere Komponenten integriert verwendet werden.
 */

import { useLLMMode, LLMMode, LLM_MODE_CONFIGS } from '@/lib/llm-mode-context'

interface LLMModeSwitcherProps {
  // Kompakte Ansicht (nur Icons) oder volle Ansicht (mit Beschreibungen)
  compact?: boolean
  // Callback wenn Modus geaendert wird
  onModeChange?: (mode: LLMMode) => void
  // Zeigt Provider-Details an
  showProviderDetails?: boolean
  // Custom className fuer den Container
  className?: string
}

// Icons als SVG (Tailwind-freundlich)
const ModeIcon = ({ mode, className = 'w-5 h-5' }: { mode: LLMMode; className?: string }) => {
  switch (mode) {
    case 'hybrid':
      return (
        <svg className={className} fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15" />
        </svg>
      )
    case 'local-only':
      return (
        <svg className={className} fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z" />
        </svg>
      )
    case 'cloud-only':
      return (
        <svg className={className} fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 15a4 4 0 004 4h9a5 5 0 10-.1-9.999 5.002 5.002 0 10-9.78 2.096A4.001 4.001 0 003 15z" />
        </svg>
      )
    case 'auto':
      return (
        <svg className={className} fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 10V3L4 14h7v7l9-11h-7z" />
        </svg>
      )
    default:
      return null
  }
}

// Mode colors for styling
const modeColors: Record<LLMMode, { bg: string; border: string; text: string; activeBg: string }> = {
  hybrid: {
    bg: 'bg-blue-50',
    border: 'border-blue-300',
    text: 'text-blue-700',
    activeBg: 'bg-blue-100',
  },
  'local-only': {
    bg: 'bg-green-50',
    border: 'border-green-300',
    text: 'text-green-700',
    activeBg: 'bg-green-100',
  },
  'cloud-only': {
    bg: 'bg-purple-50',
    border: 'border-purple-300',
    text: 'text-purple-700',
    activeBg: 'bg-purple-100',
  },
  auto: {
    bg: 'bg-amber-50',
    border: 'border-amber-300',
    text: 'text-amber-700',
    activeBg: 'bg-amber-100',
  },
}

export default function LLMModeSwitcher({
  compact = false,
  onModeChange,
  showProviderDetails = false,
  className = '',
}: LLMModeSwitcherProps) {
  const { mode, setMode, config, enableOllama, enableClaude, enableOpenAI } = useLLMMode()

  const handleModeChange = (newMode: LLMMode) => {
    setMode(newMode)
    onModeChange?.(newMode)
  }

  const modes = Object.keys(LLM_MODE_CONFIGS) as LLMMode[]

  if (compact) {
    // Compact view: horizontal button group
    return (
      <div className={`flex items-center gap-1 ${className}`}>
        {modes.map((m) => {
          const isActive = m === mode
          const colors = modeColors[m]
          return (
            <button
              key={m}
              onClick={() => handleModeChange(m)}
              className={`p-2 rounded-lg border transition-all ${
                isActive
                  ? `${colors.activeBg} ${colors.border} ${colors.text} border-2`
                  : 'bg-white border-slate-200 text-slate-500 hover:bg-slate-50'
              }`}
              title={`${LLM_MODE_CONFIGS[m].label}: ${LLM_MODE_CONFIGS[m].description}`}
            >
              <ModeIcon mode={m} className="w-5 h-5" />
            </button>
          )
        })}
      </div>
    )
  }

  // Full view: cards with descriptions
  return (
    <div className={className}>
      <div className="mb-3 flex items-center justify-between">
        <h3 className="text-sm font-semibold text-slate-700">LLM-Modus</h3>
        <span className={`text-xs px-2 py-1 rounded-full ${modeColors[mode].bg} ${modeColors[mode].text}`}>
          {config.label}
        </span>
      </div>

      <div className="grid grid-cols-2 gap-2">
        {modes.map((m) => {
          const modeConfig = LLM_MODE_CONFIGS[m]
          const isActive = m === mode
          const colors = modeColors[m]

          return (
            <button
              key={m}
              onClick={() => handleModeChange(m)}
              className={`p-3 rounded-lg border-2 transition-all text-left ${
                isActive
                  ? `${colors.activeBg} ${colors.border} ${colors.text}`
                  : 'bg-white border-slate-200 text-slate-600 hover:border-slate-300 hover:bg-slate-50'
              }`}
            >
              <div className="flex items-center gap-2 mb-1">
                <ModeIcon mode={m} className={`w-4 h-4 ${isActive ? colors.text : 'text-slate-400'}`} />
                <span className={`text-sm font-medium ${isActive ? colors.text : 'text-slate-700'}`}>
                  {modeConfig.label}
                </span>
              </div>
              <p className={`text-xs ${isActive ? colors.text : 'text-slate-500'}`}>
                {modeConfig.description}
              </p>
            </button>
          )
        })}
      </div>

      {/* Provider Details */}
      {showProviderDetails && (
        <div className="mt-4 p-3 bg-slate-50 rounded-lg">
          <p className="text-xs font-medium text-slate-600 mb-2">Aktive Provider:</p>
          <div className="flex flex-wrap gap-2">
            {enableOllama && (
              <span className="text-xs px-2 py-1 rounded bg-green-100 text-green-700">
                Ollama (Lokal)
              </span>
            )}
            {enableClaude && (
              <span className="text-xs px-2 py-1 rounded bg-orange-100 text-orange-700">
                Claude
              </span>
            )}
            {enableOpenAI && (
              <span className="text-xs px-2 py-1 rounded bg-emerald-100 text-emerald-700">
                OpenAI
              </span>
            )}
            {!enableOllama && !enableClaude && !enableOpenAI && (
              <span className="text-xs px-2 py-1 rounded bg-red-100 text-red-700">
                Keine Provider aktiv
              </span>
            )}
          </div>
        </div>
      )}
    </div>
  )
}

// Export compact variant for use in headers/toolbars
export function LLMModeSwitcherCompact(props: Omit<LLMModeSwitcherProps, 'compact'>) {
  return <LLMModeSwitcher {...props} compact />
}

// Export a dropdown variant for tight spaces
export function LLMModeSwitcherDropdown({
  className = '',
  onModeChange,
}: Pick<LLMModeSwitcherProps, 'className' | 'onModeChange'>) {
  const { mode, setMode, config } = useLLMMode()
  const colors = modeColors[mode]

  const handleChange = (e: React.ChangeEvent<HTMLSelectElement>) => {
    const newMode = e.target.value as LLMMode
    setMode(newMode)
    onModeChange?.(newMode)
  }

  return (
    <div className={`relative ${className}`}>
      <select
        value={mode}
        onChange={handleChange}
        className={`appearance-none pl-8 pr-8 py-2 rounded-lg border text-sm font-medium cursor-pointer ${colors.bg} ${colors.border} ${colors.text}`}
      >
        {(Object.keys(LLM_MODE_CONFIGS) as LLMMode[]).map((m) => (
          <option key={m} value={m}>
            {LLM_MODE_CONFIGS[m].label}
          </option>
        ))}
      </select>
      <div className="absolute left-2 top-1/2 -translate-y-1/2 pointer-events-none">
        <ModeIcon mode={mode} className={`w-4 h-4 ${colors.text}`} />
      </div>
      <div className="absolute right-2 top-1/2 -translate-y-1/2 pointer-events-none">
        <svg className={`w-4 h-4 ${colors.text}`} fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
        </svg>
      </div>
    </div>
  )
}