import { NextResponse } from 'next/server'
import { getUserFromToken } from '@/lib/auth'
import { prisma } from '@/lib/db'

export const runtime = 'nodejs'

function getErrorMessages(locale: string = 'ro') {
  const messages = {
    ro: {
      unauthorized: 'Nu esti autentificat',
      updateFailed: 'Actualizarea setărilor a eșuat',
      success: 'Setări actualizate cu succes',
      invalidData: 'Date invalide'
    },
    en: {
      unauthorized: 'Unauthorized',
      updateFailed: 'Settings update failed',
      success: 'Settings updated successfully',
      invalidData: 'Invalid data'
    }
  }
  return messages[locale as keyof typeof messages] || messages.ro
}

export async function PUT(request: Request) {
  try {
    const url = new URL(request.url)
    const locale = url.searchParams.get('locale') || 'ro'
    const messages = getErrorMessages(locale)

    // Get token from authorization header
    const authHeader = request.headers.get('authorization')
    const token = authHeader?.replace('Bearer ', '')

    if (!token) {
      return NextResponse.json({ error: messages.unauthorized }, { status: 401 })
    }

    // Verify token and get user
    const user = await getUserFromToken(token)

    if (!user) {
      return NextResponse.json({ error: messages.unauthorized }, { status: 401 })
    }

    // Parse request body
    const body = await request.json()
    const { theme, fontSize, notifications, emailUpdates, language } = body

    // Validate input - allow partial updates
    const updateData: any = {}

    if (theme !== undefined) {
      if (!['light', 'dark', 'auto'].includes(theme)) {
        return NextResponse.json({ error: messages.invalidData }, { status: 400 })
      }
      updateData.theme = theme
    }

    if (fontSize !== undefined) {
      if (!['small', 'medium', 'large'].includes(fontSize)) {
        return NextResponse.json({ error: messages.invalidData }, { status: 400 })
      }
      updateData.fontSize = fontSize
    }

    // Note: notifications and emailUpdates would need additional columns in User model
    // For now, we'll skip them or store in a JSON field if needed

    // Update user settings
    const updatedUser = await prisma.user.update({
      where: { id: user.id },
      data: updateData,
      select: {
        id: true,
        email: true,
        name: true,
        role: true,
        theme: true,
        fontSize: true,
        subscriptionTier: true,
        subscriptionStatus: true,
        conversationLimit: true,
        conversationCount: true,
        limitResetDate: true
      }
    })

    return NextResponse.json({
      success: true,
      message: messages.success,
      user: updatedUser
    })

  } catch (error) {
    console.error('Settings update error:', error)
    const url = new URL(request.url)
    const locale = url.searchParams.get('locale') || 'ro'
    const messages = getErrorMessages(locale)

    return NextResponse.json({ error: messages.updateFailed }, { status: 500 })
  }
}