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);
    console.log("[HANDLE-PAID] Request body:", JSON.stringify(body));

    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 AND consulting sessions
    // Use maybeSingle() in case there are no related records
    const { data: order, error: orderError } = await supabase
      .from("orders")
      .select(`
        *,
        profiles(email, name),
        order_items (
          product_id,
          product:products (title, type)
        ),
        consulting_sessions (
          id,
          session_date,
          start_time,
          end_time,
          status,
          topic_category
        )
      `)
      .eq("id", order_id)
      .maybeSingle();

    if (orderError) {
      console.error("[HANDLE-PAID] Database error:", orderError);
      return new Response(
        JSON.stringify({ success: false, error: "Database error", details: orderError.message }),
        { status: 500, headers: { ...corsHeaders, "Content-Type": "application/json" } }
      );
    }

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

    console.log("[HANDLE-PAID] Order found:", JSON.stringify({
      id: order.id,
      payment_status: order.payment_status,
      order_items_count: order.order_items?.length || 0,
      consulting_sessions_count: order.consulting_sessions?.length || 0,
      consulting_sessions: order.consulting_sessions
    }));

    const userEmail = order.profiles?.email || "";
    const userName = order.profiles?.name || userEmail.split('@')[0] || "Pelanggan";
    const orderItems = order.order_items as Array<{
      product_id: string;
      product: { title: string; type: string };
    }>;

    // Check if this is a consulting order by checking consulting_sessions
    const consultingSessions = order.consulting_sessions as Array<{
      id: string;
      session_date: string;
      start_time: string;
      end_time: string;
      status: string;
      topic_category?: string;
      meet_link?: string;
    }>;
    const isConsultingOrder = consultingSessions && consultingSessions.length > 0;

    console.log("[HANDLE-PAID] isConsultingOrder:", isConsultingOrder, "consultingSessions:", consultingSessions);

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

      // Update consulting sessions status from pending_payment to confirmed
      const { error: updateError } = await supabase
        .from("consulting_sessions")
        .update({ status: "confirmed" })
        .eq("order_id", order_id)
        .in("status", ["pending_payment"]);

      console.log("[HANDLE-PAID] Session update result:", { updateError, order_id });

      if (updateError) {
        console.error("[HANDLE-PAID] Failed to update sessions:", updateError);
      }

      if (consultingSessions && consultingSessions.length > 0) {
        try {
          console.log("[HANDLE-PAID] Creating Google Meet for order:", order_id);

          // Use the first session for Meet creation
          const session = consultingSessions[0];
          const topic = session.topic_category || "Konsultasi 1-on-1";

          console.log("[HANDLE-PAID] Session time:", `${session.start_time} - ${session.end_time}`);

          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: session.id,
                date: session.session_date,
                start_time: session.start_time,
                end_time: session.end_time,
                client_name: userName,
                client_email: userEmail,
                topic: topic,
                notes: `Session ID: ${session.id}`,
              }),
            }
          );

          console.log("[HANDLE-PAID] Meet response status:", meetResponse.status);

          if (meetResponse.ok) {
            const meetData = await meetResponse.json();
            console.log("[HANDLE-PAID] Meet response data:", meetData);

            if (meetData.success) {
              console.log("[HANDLE-PAID] Meet created:", meetData.meet_link);

              // Update session with meet link
              const { error: updateError } = await supabase
                .from("consulting_sessions")
                .update({ meet_link: meetData.meet_link })
                .eq("order_id", order_id);

              if (updateError) {
                console.error("[HANDLE-PAID] Failed to update meet_link:", updateError);
              } else {
                console.log("[HANDLE-PAID] Meet link updated for session:", order_id);
              }
            } else {
              console.error("[HANDLE-PAID] Meet creation returned success=false:", meetData);
            }
          } else {
            const errorText = await meetResponse.text();
            console.error("[HANDLE-PAID] Meet creation failed with status:", meetResponse.status);
            console.error("[HANDLE-PAID] Error response:", errorText);
          }
        } catch (error) {
          console.error("[HANDLE-PAID] Meet creation exception:", error);
          // Don't fail the entire process
        }
      }

      // Send consulting notification with the consultingSessions data
      await sendNotification(supabase, "consulting_scheduled", {
        nama: userName,
        email: userEmail,
        order_id_short: order_id.substring(0, 8),
        tanggal_pesanan: new Date().toLocaleDateString("id-ID"),
        total: `Rp ${order.total_amount.toLocaleString("id-ID")}`,
        metode_pembayaran: order.payment_method || "Unknown",
        tanggal_konsultasi: consultingSessions[0]?.session_date || "",
        jam_konsultasi: consultingSessions.map(s => `${s.start_time.substring(0, 5)} - ${s.end_time.substring(0, 5)}`).join(", "),
        link_meet: consultingSessions[0]?.meet_link || "Akan dikirim terpisah",
        event: "consulting_scheduled",
        order_id,
        user_id: order.user_id,
        user_name: userName,
        slots: consultingSessions,
      });
    } 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", {
        nama: userName,
        email: userEmail,
        order_id_short: 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_name: userName,
        products: productTitles,
      });

      // Send access granted notification
      await sendNotification(supabase, "access_granted", {
        nama: userName,
        email: userEmail,
        produk: productTitles.join(", "),
        event: "access_granted",
        order_id,
        user_id: order.user_id,
        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,
  data: Record<string, any>
): 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(data),
      });
      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: data.email,
      subject: template.email_subject,
      html: template.email_body_html,
      shortcodeData: data,
    }),
  });
}