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",
};

interface HandlePaidOrderRequest {
  order_id: string;
  user_id: string;
  total_amount: number;
  payment_method?: string;
  payment_provider?: string;
}

serve(async (req: Request): Promise<Response> => {
  if (req.method === "OPTIONS") {
    return new Response(null, { headers: corsHeaders });
  }

  try {
    const body: HandlePaidOrderRequest = await req.json();
    const { order_id } = body;

    console.log("[HANDLE-PAID] Processing paid order:", order_id);

    const supabaseUrl = Deno.env.get("SUPABASE_URL")!;
    const supabaseServiceKey = Deno.env.get("SUPABASE_SERVICE_ROLE_KEY")!;
    const supabase = createClient(supabaseUrl, supabaseServiceKey);

    // Get full order details with items
    const { data: order, error: orderError } = await supabase
      .from("orders")
      .select(`
        *,
        profiles(email, full_name),
        order_items (
          product_id,
          product:products (title, type)
        )
      `)
      .eq("id", order_id)
      .single();

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

    const userEmail = order.profiles?.email || "";
    const userName = order.profiles?.full_name || "Pelanggan";
    const orderItems = order.order_items as Array<{
      product_id: string;
      product: { title: string; type: string };
    }>;

    // Check if this is a consulting order
    const hasConsulting = orderItems.some(item => item.product.type === "consulting");

    if (hasConsulting) {
      console.log("[HANDLE-PAID] Consulting order detected, processing slots");

      // Update consulting slots status
      await supabase
        .from("consulting_slots")
        .update({ status: "confirmed" })
        .eq("order_id", order_id);

      // Create Google Meet events for each slot
      const { data: consultingSlots } = await supabase
        .from("consulting_slots")
        .select("*")
        .eq("order_id", order_id);

      if (consultingSlots && consultingSlots.length > 0) {
        for (const slot of consultingSlots) {
          try {
            console.log("[HANDLE-PAID] Creating Google Meet for slot:", slot.id);

            const topic = orderItems.find(i => i.product.type === "consulting")?.product.title || "Konsultasi 1-on-1";

            const meetResponse = await fetch(
              `${supabaseUrl}/functions/v1/create-google-meet-event`,
              {
                method: "POST",
                headers: {
                  "Content-Type": "application/json",
                  "Authorization": `Bearer ${Deno.env.get("SUPABASE_ANON_KEY")}`,
                },
                body: JSON.stringify({
                  slot_id: slot.id,
                  date: slot.date,
                  start_time: slot.start_time,
                  end_time: slot.end_time,
                  client_name: userName,
                  client_email: userEmail,
                  topic: topic,
                }),
              }
            );

            if (meetResponse.ok) {
              const meetData = await meetResponse.json();
              if (meetData.success) {
                console.log("[HANDLE-PAID] Meet created:", meetData.meet_link);
              }
            }
          } catch (error) {
            console.error("[HANDLE-PAID] Meet creation failed:", error);
            // Don't fail the entire process
          }
        }

        // Refresh slots to get meet_link
        const { data: updatedSlots } = await supabase
          .from("consulting_slots")
          .select("*")
          .eq("order_id", order_id);

        const slots = (updatedSlots || []) as Array<{
          date: string;
          start_time: string;
          meet_link?: string;
        }>;

        // Send consulting notification
        await sendNotification(supabase, "consulting_scheduled", userEmail, {
          nama: userName,
          email: userEmail,
          order_id: order_id.substring(0, 8),
          tanggal_pesanan: new Date().toLocaleDateString("id-ID"),
          total: `Rp ${order.total_amount.toLocaleString("id-ID")}`,
          metode_pembayaran: order.payment_method || "Unknown",
          tanggal_konsultasi: slots[0]?.date || "",
          jam_konsultasi: slots.map(s => s.start_time.substring(0, 5)).join(", "),
          link_meet: slots[0]?.meet_link || "Akan dikirim terpisah",
        }, {
          event: "consulting_scheduled",
          order_id,
          user_id: order.user_id,
          user_email: userEmail,
          user_name: userName,
          total_amount: order.total_amount,
          payment_method: order.payment_method,
          slots: updatedSlots,
        });
      }
    } else {
      // Regular product order - grant access
      console.log("[HANDLE-PAID] Regular product order, granting access");

      for (const item of orderItems) {
        // Check if access already exists
        const { data: existingAccess } = await supabase
          .from("user_access")
          .select("id")
          .eq("user_id", order.user_id)
          .eq("product_id", item.product_id)
          .maybeSingle();

        if (!existingAccess) {
          await supabase
            .from("user_access")
            .insert({
              user_id: order.user_id,
              product_id: item.product_id,
            });
          console.log("[HANDLE-PAID] Access granted for product:", item.product_id);
        }
      }

      const productTitles = orderItems.map(i => i.product.title);

      // Send payment success notification
      await sendNotification(supabase, "payment_success", userEmail, {
        nama: userName,
        email: userEmail,
        order_id: order_id.substring(0, 8),
        tanggal_pesanan: new Date().toLocaleDateString("id-ID"),
        total: `Rp ${order.total_amount.toLocaleString("id-ID")}`,
        metode_pembayaran: order.payment_method || "Unknown",
        produk: productTitles.join(", "),
        link_akses: `${Deno.env.get("SITE_URL") || ""}/access`,
      }, {
        event: "payment_success",
        order_id,
        user_id: order.user_id,
        user_email: userEmail,
        user_name: userName,
        total_amount: order.total_amount,
        payment_method: order.payment_method,
        products: productTitles,
      });

      // Send access granted notification
      await sendNotification(supabase, "access_granted", userEmail, {
        nama: userName,
        produk: productTitles.join(", "),
      }, {
        event: "access_granted",
        order_id,
        user_id: order.user_id,
        user_email: userEmail,
        user_name: userName,
        products: productTitles,
      });
    }

    return new Response(
      JSON.stringify({ success: true, order_id }),
      { headers: { ...corsHeaders, "Content-Type": "application/json" } }
    );

  } catch (error: any) {
    console.error("[HANDLE-PAID] Error:", error);
    return new Response(
      JSON.stringify({
        success: false,
        error: error.message || "Internal server error"
      }),
      { status: 500, headers: { ...corsHeaders, "Content-Type": "application/json" } }
    );
  }
});

// Helper function to send notification
async function sendNotification(
  supabase: any,
  templateKey: string,
  shortcodeData: Record<string, string>,
  webhookPayload: Record<string, unknown>
): Promise<void> {
  console.log("[HANDLE-PAID] Sending notification:", templateKey);

  // Fetch template
  const { data: template } = await supabase
    .from("notification_templates")
    .select("*")
    .eq("key", templateKey)
    .single();

  if (!template) {
    console.log("[HANDLE-PAID] Template not found:", templateKey);
    return;
  }

  // Send webhook if configured
  if (template.webhook_url) {
    try {
      await fetch(template.webhook_url, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(webhookPayload),
      });
      console.log("[HANDLE-PAID] Webhook sent to:", template.webhook_url);
    } catch (error) {
      console.error("[HANDLE-PAID] Webhook failed:", error);
    }
  }

  // Skip email if template is inactive
  if (!template.is_active) {
    console.log("[HANDLE-PAID] Template inactive, skipping email");
    return;
  }

  // Send email via Mailketing
  await fetch(`${Deno.env.get("SUPABASE_URL")}/functions/v1/send-email-v2`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "Authorization": `Bearer ${Deno.env.get("SUPABASE_ANON_KEY")}`,
    },
    body: JSON.stringify({
      to: shortcodeData.email,
      subject: template.email_subject,
      html: template.email_body_html,
      shortcodeData,
    }),
  });
}