import { serve } from "https://deno.land/std@0.190.0/http/server.ts";
import { createClient } from "https://esm.sh/@supabase/supabase-js@2";

const corsHeaders = {
  "Access-Control-Allow-Origin": "*",
  "Access-Control-Allow-Headers": "authorization, x-client-info, apikey, content-type, x-pakasir-signature, x-callback-token",
};

// Environment variables
const PAKASIR_WEBHOOK_SECRET = Deno.env.get("PAKASIR_WEBHOOK_SECRET") || "";
const SUPABASE_URL = Deno.env.get("SUPABASE_URL")!;
const SUPABASE_SERVICE_ROLE_KEY = Deno.env.get("SUPABASE_SERVICE_ROLE_KEY")!;

interface PakasirWebhookPayload {
  amount: number;
  order_id: string;
  project: string;
  status: string;
  payment_method?: string;
  completed_at?: string;
}

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

  try {
    // Verify webhook signature if configured
    const signature = req.headers.get("x-pakasir-signature") || req.headers.get("x-callback-token") || "";

    if (PAKASIR_WEBHOOK_SECRET && signature !== PAKASIR_WEBHOOK_SECRET) {
      console.error("[WEBHOOK] Invalid signature");
      return new Response(JSON.stringify({ error: "Invalid signature" }), {
        status: 401,
        headers: { ...corsHeaders, "Content-Type": "application/json" },
      });
    }

    const payload: PakasirWebhookPayload = await req.json();
    console.log("[WEBHOOK] Received payload:", JSON.stringify(payload));

    // Validate required fields
    if (!payload.order_id || !payload.status) {
      console.error("[WEBHOOK] Missing required fields");
      return new Response(JSON.stringify({ error: "Missing required fields" }), {
        status: 400,
        headers: { ...corsHeaders, "Content-Type": "application/json" },
      });
    }

    // Only process completed payments
    if (payload.status !== "completed") {
      console.log("[WEBHOOK] Ignoring non-completed status:", payload.status);
      return new Response(JSON.stringify({ message: "Status not completed, ignored" }), {
        status: 200,
        headers: { ...corsHeaders, "Content-Type": "application/json" },
      });
    }

    // Create Supabase client with service role for admin access
    const supabase = createClient(SUPABASE_URL, SUPABASE_SERVICE_ROLE_KEY);

    // Find the order by payment_reference or id
    const { data: order, error: orderError } = await supabase
      .from("orders")
      .select("id, payment_status")
      .or(`payment_reference.eq.${payload.order_id},id.eq.${payload.order_id}`)
      .single();

    if (orderError || !order) {
      console.error("[WEBHOOK] Order not found:", payload.order_id, orderError);
      return new Response(JSON.stringify({ error: "Order not found" }), {
        status: 404,
        headers: { ...corsHeaders, "Content-Type": "application/json" },
      });
    }

    // Skip if already paid
    if (order.payment_status === "paid") {
      console.log("[WEBHOOK] Order already paid:", order.id);
      return new Response(JSON.stringify({ message: "Order already paid" }), {
        status: 200,
        headers: { ...corsHeaders, "Content-Type": "application/json" },
      });
    }

    // Update order status - this will trigger the database trigger
    const { error: updateError } = await supabase
      .from("orders")
      .update({
        payment_status: "paid",
        status: "paid",
        payment_provider: "pakasir",
        payment_method: payload.payment_method || "unknown",
        updated_at: new Date().toISOString(),
        // Clear QR string after payment
        qr_string: null,
        qr_expires_at: null,
      })
      .eq("id", order.id);

    if (updateError) {
      console.error("[WEBHOOK] Failed to update order:", updateError);
      return new Response(JSON.stringify({ error: "Failed to update order" }), {
        status: 500,
        headers: { ...corsHeaders, "Content-Type": "application/json" },
      });
    }

    console.log("[WEBHOOK] Order updated to paid:", order.id, "- Trigger will handle the rest");

    return new Response(JSON.stringify({ success: true, order_id: order.id }), {
      status: 200,
      headers: { ...corsHeaders, "Content-Type": "application/json" },
    });
  } catch (error) {
    console.error("[WEBHOOK] Unexpected error:", error);
    return new Response(JSON.stringify({ error: "Internal server error" }), {
      status: 500,
      headers: { ...corsHeaders, "Content-Type": "application/json" },
    });
  }
});