import { NextRequest } from 'next/server'
import { prisma } from '@/lib/prisma'

export async function GET(req: NextRequest) {
  try {
    const canvasId = req.nextUrl.searchParams.get('id')

    if (!canvasId) {
      return new Response(JSON.stringify({ error: 'Missing id' }), {
        status: 400,
        headers: { 'Content-Type': 'application/json' },
      })
    }

    const canvas = await prisma.canvas.findUnique({
      where: { id: canvasId },
    })

    if (!canvas) {
      return new Response(JSON.stringify({ error: 'Not found' }), {
        status: 404,
        headers: { 'Content-Type': 'application/json' },
      })
    }


    let parsed: any
    try {
      parsed = JSON.parse(canvas.data)
    } catch (parseErr) {
      return new Response(JSON.stringify({ error: 'Invalid data' }), {
        status: 500,
        headers: { 'Content-Type': 'application/json' },
      })
    }


    if (parsed.type !== 'slides' || !parsed.html) {
      return new Response(JSON.stringify({ error: 'Not a slides canvas' }), {
        status: 400,
        headers: { 'Content-Type': 'application/json' },
      })
    }


    return new Response(parsed.html, {
      status: 200,
      headers: {
        'Content-Type': 'text/html; charset=utf-8',
        'Cache-Control': 'no-cache',
      },
    })
  } catch (error) {
    console.error('[Slides API] FATAL:', error)
    return new Response(JSON.stringify({ error: 'Internal Server Error' }), {
      status: 500,
      headers: { 'Content-Type': 'application/json' },
    })
  }
}