import { NextResponse } from 'next/server'
import { getChatProvider } from '@/lib/ai/factory'
import { getSystemConfig } from '@/lib/config'
import { auth } from '@/auth'

export async function POST() {
  const session = await auth()
  if (!session?.user?.id) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
  }
  if ((session.user as { role?: string }).role !== 'ADMIN') {
    return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
  }

  try {
    const config = await getSystemConfig()
    const provider = getChatProvider(config)

    const testMessage = 'Reply in exactly 3 words: what is your name?'

    const startTime = Date.now()
    const response = await provider.generateText(testMessage)
    const endTime = Date.now()

    if (!response || response.trim().length === 0) {
      return NextResponse.json(
        {
          success: false,
          error: 'No response from chat provider',
          provider: config.AI_PROVIDER_CHAT || config.AI_PROVIDER_TAGS || 'ollama',
          model: config.AI_MODEL_CHAT || 'granite4:latest',
        },
        { status: 500 },
      )
    }

    return NextResponse.json({
      success: true,
      provider: config.AI_PROVIDER_CHAT || config.AI_PROVIDER_TAGS || 'ollama',
      model: config.AI_MODEL_CHAT || 'granite4:latest',
      chatResponse: response.trim(),
      responseTime: endTime - startTime,
    })
  } catch (error: unknown) {
    const config = await getSystemConfig()
    const message = error instanceof Error ? error.message : 'Unknown error'

    return NextResponse.json(
      {
        success: false,
        error: message,
        provider: config.AI_PROVIDER_CHAT || config.AI_PROVIDER_TAGS || 'ollama',
        model: config.AI_MODEL_CHAT || 'granite4:latest',
        stack: process.env.NODE_ENV === 'development' && error instanceof Error ? error.stack : undefined,
      },
      { status: 500 },
    )
  }
}