import { serve } from "https://deno.land/std@0.168.0/http/server.ts"

const corsHeaders = {
  'Access-Control-Allow-Origin': '*',
  'Access-Control-Allow-Headers': 'authorization, x-client-info, apikey, content-type',
}

serve(async (req) => {
  // Handle CORS preflight requests
  if (req.method === 'OPTIONS') {
    return new Response(null, { headers: corsHeaders })
  }

  try {
    const CLOUDFLARE_ACCOUNT_ID = Deno.env.get('CLOUDFLARE_ACCOUNT_ID')
    const CLOUDFLARE_IMAGES_API_TOKEN = Deno.env.get('CLOUDFLARE_IMAGES_API_TOKEN')

    if (!CLOUDFLARE_ACCOUNT_ID || !CLOUDFLARE_IMAGES_API_TOKEN) {
      throw new Error('Missing Cloudflare credentials')
    }

    if (req.method !== 'POST') {
      return new Response(
        JSON.stringify({ error: 'Method not allowed' }),
        { 
          status: 405, 
          headers: { ...corsHeaders, 'Content-Type': 'application/json' } 
        }
      )
    }

    const formData = await req.formData()
    const file = formData.get('file') as File
    
    if (!file) {
      return new Response(
        JSON.stringify({ error: 'No file provided' }),
        { 
          status: 400, 
          headers: { ...corsHeaders, 'Content-Type': 'application/json' } 
        }
      )
    }

    // Validate file size (10MB limit)
    const maxSize = 10 * 1024 * 1024 // 10MB
    if (file.size > maxSize) {
      return new Response(
        JSON.stringify({ error: 'File size exceeds 10MB limit' }),
        { 
          status: 400, 
          headers: { ...corsHeaders, 'Content-Type': 'application/json' } 
        }
      )
    }

    // Validate file type
    const allowedTypes = ['image/jpeg', 'image/png', 'image/webp']
    if (!allowedTypes.includes(file.type)) {
      return new Response(
        JSON.stringify({ error: 'Invalid file type. Only JPEG, PNG, and WebP are allowed.' }),
        { 
          status: 400, 
          headers: { ...corsHeaders, 'Content-Type': 'application/json' } 
        }
      )
    }

    // Create FormData for Cloudflare Images API
    const cloudflareFormData = new FormData()
    cloudflareFormData.append('file', file)

    // Optional metadata
    const metadata = formData.get('metadata')
    if (metadata) {
      cloudflareFormData.append('metadata', metadata.toString())
    }

    // Upload to Cloudflare Images
    const uploadResponse = await fetch(
      `https://api.cloudflare.com/client/v4/accounts/${CLOUDFLARE_ACCOUNT_ID}/images/v1`,
      {
        method: 'POST',
        headers: {
          'Authorization': `Bearer ${CLOUDFLARE_IMAGES_API_TOKEN}`,
        },
        body: cloudflareFormData,
      }
    )

    const uploadResult = await uploadResponse.json()

    if (!uploadResponse.ok) {
      console.error('Cloudflare upload error:', uploadResult)
      return new Response(
        JSON.stringify({ 
          error: 'Failed to upload image', 
          details: uploadResult.errors || uploadResult.error 
        }),
        { 
          status: 500, 
          headers: { ...corsHeaders, 'Content-Type': 'application/json' } 
        }
      )
    }

    // Return the upload result with image URLs
    return new Response(
      JSON.stringify({
        success: true,
        id: uploadResult.result.id,
        filename: uploadResult.result.filename,
        uploaded: uploadResult.result.uploaded,
        variants: uploadResult.result.variants,
        // Provide convenient URLs for different sizes
        urls: {
          original: uploadResult.result.variants[0], // First variant is usually the original
          thumbnail: `${uploadResult.result.variants[0]}/w=400,h=400,fit=crop`, // 400x400 thumbnail
          medium: `${uploadResult.result.variants[0]}/w=800,h=600,fit=cover`, // 800x600 medium
          large: `${uploadResult.result.variants[0]}/w=1200,h=900,fit=cover`, // 1200x900 large
        }
      }),
      { 
        headers: { ...corsHeaders, 'Content-Type': 'application/json' } 
      }
    )

  } catch (error) {
    console.error('Upload error:', error)
    return new Response(
      JSON.stringify({ 
        error: 'Internal server error', 
        message: error.message 
      }),
      { 
        status: 500, 
        headers: { ...corsHeaders, 'Content-Type': 'application/json' } 
      }
    )
  }
})