'use server'

import { auth } from '@/auth'
import { prisma } from '@/lib/prisma'
import { revalidatePath } from 'next/cache'

export type UserAISettingsData = {
  titleSuggestions?: boolean
  semanticSearch?: boolean
  paragraphRefactor?: boolean
  memoryEcho?: boolean
  memoryEchoFrequency?: 'daily' | 'weekly' | 'custom'
  aiProvider?: 'auto' | 'openai' | 'ollama'
  preferredLanguage?: 'auto' | 'en' | 'fr' | 'es' | 'de' | 'fa' | 'it' | 'pt' | 'ru' | 'zh' | 'ja' | 'ko' | 'ar' | 'hi' | 'nl' | 'pl'
  demoMode?: boolean
}

/**
 * Update AI settings for the current user
 */
export async function updateAISettings(settings: UserAISettingsData) {
  const session = await auth()
  if (!session?.user?.id) {
    throw new Error('Unauthorized')
  }

  try {
    // Upsert settings (create if not exists, update if exists)
    await prisma.userAISettings.upsert({
      where: { userId: session.user.id },
      create: {
        userId: session.user.id,
        ...settings
      },
      update: settings
    })

    revalidatePath('/settings/ai')
    revalidatePath('/')

    return { success: true }
  } catch (error) {
    console.error('Error updating AI settings:', error)
    throw new Error('Failed to update AI settings')
  }
}

/**
 * Get AI settings for the current user
 */
export async function getAISettings() {
  const session = await auth()

  // Return defaults for non-logged-in users
  if (!session?.user?.id) {
    return {
      titleSuggestions: true,
      semanticSearch: true,
      paragraphRefactor: true,
      memoryEcho: true,
      memoryEchoFrequency: 'daily' as const,
      aiProvider: 'auto' as const,
      preferredLanguage: 'auto' as const,
      demoMode: false
    }
  }

  try {
    const settings = await prisma.userAISettings.findUnique({
      where: { userId: session.user.id }
    })

    // Return settings or defaults if not found
    if (!settings) {
      return {
        titleSuggestions: true,
        semanticSearch: true,
        paragraphRefactor: true,
        memoryEcho: true,
        memoryEchoFrequency: 'daily' as const,
        aiProvider: 'auto' as const,
        preferredLanguage: 'auto' as const,
        demoMode: false
      }
    }

    // Type-cast database values to proper union types
    return {
      titleSuggestions: settings.titleSuggestions,
      semanticSearch: settings.semanticSearch,
      paragraphRefactor: settings.paragraphRefactor,
      memoryEcho: settings.memoryEcho,
      memoryEchoFrequency: (settings.memoryEchoFrequency || 'daily') as 'daily' | 'weekly' | 'custom',
      aiProvider: (settings.aiProvider || 'auto') as 'auto' | 'openai' | 'ollama',
      preferredLanguage: (settings.preferredLanguage || 'auto') as 'auto' | 'en' | 'fr' | 'es' | 'de' | 'fa' | 'it' | 'pt' | 'ru' | 'zh' | 'ja' | 'ko' | 'ar' | 'hi' | 'nl' | 'pl',
      demoMode: settings.demoMode || false
    }
  } catch (error) {
    console.error('Error getting AI settings:', error)
    // Return defaults on error
    return {
      titleSuggestions: true,
      semanticSearch: true,
      paragraphRefactor: true,
      memoryEcho: true,
      memoryEchoFrequency: 'daily' as const,
      aiProvider: 'auto' as const,
      preferredLanguage: 'auto' as const,
      demoMode: false
    }
  }
}

/**
 * Get user's preferred AI provider
 */
export async function getUserAIPreference(): Promise<'auto' | 'openai' | 'ollama'> {
  const settings = await getAISettings()
  return settings.aiProvider
}

/**
 * Check if a specific AI feature is enabled for the user
 */
export async function isAIFeatureEnabled(feature: keyof UserAISettingsData): Promise<boolean> {
  const settings = await getAISettings()

  switch (feature) {
    case 'titleSuggestions':
      return settings.titleSuggestions
    case 'semanticSearch':
      return settings.semanticSearch
    case 'paragraphRefactor':
      return settings.paragraphRefactor
    case 'memoryEcho':
      return settings.memoryEcho
    default:
      return true
  }
}