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

export async function GET(req: NextRequest) {
  try {
    const canvasId = req.nextUrl.searchParams.get('id')
    console.log('[Slides API] Request for id:', canvasId)

    if (!canvasId) {
      console.log('[Slides API] ERROR: Missing id')
      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) {
      console.log('[Slides API] ERROR: Canvas not found for id:', canvasId)
      return new Response(JSON.stringify({ error: 'Not found' }), {
        status: 404,
        headers: { 'Content-Type': 'application/json' },
      })
    }

    console.log('[Slides API] Canvas found:', canvas.name, '| data length:', canvas.data?.length)
    console.log('[Slides API] Raw data start:', canvas.data?.substring(0, 200))

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

    console.log('[Slides API] Parsed type:', parsed.type, '| has html:', !!parsed.html, '| html length:', parsed.html?.length)
    console.log('[Slides API] HTML start:', parsed.html?.substring(0, 150))

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

    console.log('[Slides API] SUCCESS: Returning HTML, length:', parsed.html.length)

    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' },
    })
  }
}