import { serve } from "https://deno.land/std@0.190.0/http/server.ts";
import { createClient, SupabaseClient } from "https://esm.sh/@supabase/supabase-js@2.49.1";
import { SMTPClient } from "https://deno.land/x/denomailer@1.6.0/mod.ts";

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;
}

interface SmtpSettings {
  smtp_host: string;
  smtp_port: number;
  smtp_username: string;
  smtp_password: string;
  smtp_from_name: string;
  smtp_from_email: string;
  smtp_use_tls: boolean;
}

interface NotificationTemplate {
  id: string;
  key: string;
  name: string;
  is_active: boolean;
  email_subject: string;
  email_body_html: string;
  webhook_url: string;
}

// Replace shortcodes in template
function replaceShortcodes(template: string, data: Record<string, string>): string {
  let result = template || "";
  for (const [key, value] of Object.entries(data)) {
    result = result.replace(new RegExp(`\\{${key}\\}`, 'g'), value || '');
  }
  return result;
}

// Send email via SMTP
async function sendEmail(
  smtp: SmtpSettings,
  to: string,
  subject: string,
  htmlBody: string,
  brandFromName?: string
): Promise<boolean> {
  if (!smtp.smtp_host || !smtp.smtp_username || !smtp.smtp_password) {
    console.log("[EMAIL] SMTP not configured, skipping email");
    return false;
  }

  try {
    const client = new SMTPClient({
      connection: {
        hostname: smtp.smtp_host,
        port: smtp.smtp_port,
        tls: smtp.smtp_use_tls,
        auth: {
          username: smtp.smtp_username,
          password: smtp.smtp_password,
        },
      },
    });

    const fromName = smtp.smtp_from_name || brandFromName || "Notification";
    const fromEmail = smtp.smtp_from_email || smtp.smtp_username;

    await client.send({
      from: `${fromName} <${fromEmail}>`,
      to: to,
      subject: subject,
      content: "auto",
      html: htmlBody,
    });

    await client.close();
    console.log("[EMAIL] Sent successfully to:", to);
    return true;
  } catch (error) {
    console.error("[EMAIL] Failed to send:", error);
    return false;
  }
}

// Send webhook notification
async function sendWebhook(url: string, payload: Record<string, unknown>): Promise<boolean> {
  if (!url) return false;

  try {
    const response = await fetch(url, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(payload),
    });
    console.log("[WEBHOOK] Sent to:", url, "Status:", response.status);
    return response.ok;
  } catch (error) {
    console.error("[WEBHOOK] Failed to send to:", url, error);
    return false;
  }
}

// Process notification for a specific event
async function processNotification(
  supabase: SupabaseClient,
  templateKey: string,
  recipientEmail: string,
  shortcodeData: Record<string, string>,
  webhookPayload: Record<string, unknown>
): Promise<void> {
  console.log(`[NOTIFICATION] Processing ${templateKey} for ${recipientEmail}`);

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

  if (!templateData) {
    console.log(`[NOTIFICATION] Template ${templateKey} not found`);
    return;
  }

  const template = templateData as NotificationTemplate;

  // ALWAYS send webhook if URL is configured (regardless of is_active)
  if (template.webhook_url) {
    await sendWebhook(template.webhook_url, webhookPayload);
    
    // Update last_payload_example
    await supabase
      .from("notification_templates")
      .update({ last_payload_example: webhookPayload, updated_at: new Date().toISOString() })
      .eq("id", template.id);
  }

  // Only send email if is_active is true
  if (!template.is_active) {
    console.log(`[NOTIFICATION] Template ${templateKey} is not active, skipping email`);
    return;
  }

  // Fetch SMTP settings
  const { data: smtpData } = await supabase
    .from("notification_settings")
    .select("*")
    .single();

  if (!smtpData) {
    console.log("[NOTIFICATION] SMTP settings not configured");
    return;
  }

  const smtpSettings = smtpData as SmtpSettings;

  // Fetch brand settings for fallback from_name
  const { data: platformData } = await supabase
    .from("platform_settings")
    .select("brand_email_from_name")
    .single();

  const brandFromName = (platformData as { brand_email_from_name?: string } | null)?.brand_email_from_name;

  // Replace shortcodes
  const subject = replaceShortcodes(template.email_subject, shortcodeData);
  const body = replaceShortcodes(template.email_body_html, shortcodeData);

  // Wrap body in email template
  const fullHtml = `
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; }
    .container { max-width: 600px; margin: 0 auto; padding: 20px; }
    .header { background: #f8f9fa; padding: 20px; text-align: center; border-radius: 8px 8px 0 0; }
    .content { background: #ffffff; padding: 30px; border: 1px solid #e9ecef; }
    .footer { background: #f8f9fa; padding: 15px; text-align: center; font-size: 12px; color: #6c757d; border-radius: 0 0 8px 8px; }
    a { color: #0066cc; }
    .button { display: inline-block; padding: 12px 24px; background: #0066cc; color: white; text-decoration: none; border-radius: 6px; margin: 10px 0; }
  </style>
</head>
<body>
  <div class="container">
    <div class="content">
      ${body}
    </div>
    <div class="footer">
      Email ini dikirim otomatis. Jangan membalas email ini.
    </div>
  </div>
</body>
</html>`;

  await sendEmail(
    smtpSettings,
    recipientEmail,
    subject,
    fullHtml,
    brandFromName
  );
}

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, user_id, total_amount, 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
    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(),
      })
      .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);

    // Get user profile
    const { data: profile } = await supabase
      .from("profiles")
      .select("full_name, email")
      .eq("id", order.user_id)
      .single();

    const userEmail = (profile as { email?: string } | null)?.email || "";
    const userName = (profile as { full_name?: string } | null)?.full_name || "Pelanggan";

    // Check for consulting slots linked to this order
    const { data: consultingSlots } = await supabase
      .from("consulting_slots")
      .select("*")
      .eq("order_id", order.id);

    if (consultingSlots && consultingSlots.length > 0) {
      // This is a consulting order - update slot statuses
      const { error: slotUpdateError } = await supabase
        .from("consulting_slots")
        .update({ status: "confirmed" })
        .eq("order_id", order.id);

      if (slotUpdateError) {
        console.error("[WEBHOOK] Failed to update consulting slots:", slotUpdateError);
      } else {
        console.log("[WEBHOOK] Consulting slots confirmed for order:", order.id);
      }

      // Create Google Meet events for each consulting slot
      for (const slot of consultingSlots) {
        try {
          console.log("[WEBHOOK] Creating Google Meet event for slot:", slot.id);

          const { data: settings } = await supabase
            .from("platform_settings")
            .select("integration_google_calendar_id")
            .single();

          if (!settings?.integration_google_calendar_id) {
            console.log("[WEBHOOK] Google Calendar not configured, skipping Meet creation");
            continue;
          }

          // Get product info for the topic
          const { data: orderItems } = await supabase
            .from("order_items")
            .select("product_id, products(name)")
            .eq("order_id", order.id)
            .limit(1);

          const topic = orderItems?.[0]?.products?.name || "Konsultasi 1-on-1";

          const meetResponse = await fetch(
            `${Deno.env.get("SUPABASE_URL")}/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("[WEBHOOK] Google Meet event created:", meetData.meet_link);
            } else {
              console.error("[WEBHOOK] Failed to create Meet event:", meetData.message);
            }
          } else {
            console.error("[WEBHOOK] Meet creation API error:", meetResponse.status);
          }
        } catch (error) {
          console.error("[WEBHOOK] Error creating Google Meet event:", error);
          // Don't fail the webhook if Meet creation fails
        }
      }

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

      // Format consulting slot details for notification
      const slots = (updatedSlots || consultingSlots) as Array<{ date: string; start_time: string; end_time: string; meet_link?: string }>;

      const shortcodeData: Record<string, string> = {
        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: payload.payment_method || "Pakasir",
        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",
      };

      const webhookPayload: Record<string, unknown> = {
        event: "consulting_scheduled",
        order_id: order.id,
        user_id: order.user_id,
        user_email: userEmail,
        user_name: userName,
        total_amount: order.total_amount,
        payment_method: payload.payment_method,
        slots: consultingSlots,
        timestamp: new Date().toISOString(),
      };

      // Send consulting_scheduled notification
      await processNotification(supabase, "consulting_scheduled", userEmail, shortcodeData, webhookPayload);

    } else {
      // Regular product order - grant access
      const { data: orderItems, error: itemsError } = await supabase
        .from("order_items")
        .select("product_id, product:products(title)")
        .eq("order_id", order.id);

      if (itemsError) {
        console.error("[WEBHOOK] Failed to fetch order items:", itemsError);
      }

      const productTitles: string[] = [];

      // Grant user_access for each product
      if (orderItems && orderItems.length > 0) {
        for (const item of orderItems as Array<{ product_id: string; product: { title: string } | { title: string }[] | null }>) {
          const productId = item.product_id;
          const productData = Array.isArray(item.product) ? item.product[0] : item.product;
          
          // Check if access already exists
          const { data: existingAccess } = await supabase
            .from("user_access")
            .select("id")
            .eq("user_id", order.user_id)
            .eq("product_id", productId)
            .maybeSingle();

          if (!existingAccess) {
            const { error: accessError } = await supabase
              .from("user_access")
              .insert({
                user_id: order.user_id,
                product_id: productId,
              });

            if (accessError) {
              console.error("[WEBHOOK] Failed to grant access for product:", productId, accessError);
            } else {
              console.log("[WEBHOOK] Granted access for product:", productId);
            }
          }

          if (productData?.title) {
            productTitles.push(productData.title);
          }
        }
      }

      const shortcodeData: Record<string, string> = {
        nama: userName,
        email: userEmail,
        order_id: order.id.substring(0, 8),
        tanggal_pesanan: new Date().toLocaleDateString("id-ID"),
        total: `Rp ${order.total_amount.toLocaleString("id-ID")}`,
        metode_pembayaran: payload.payment_method || "Pakasir",
        produk: productTitles.join(", "),
        link_akses: `${Deno.env.get("SITE_URL") || ""}/access`,
      };

      const webhookPayload: Record<string, unknown> = {
        event: "payment_success",
        order_id: order.id,
        user_id: order.user_id,
        user_email: userEmail,
        user_name: userName,
        total_amount: order.total_amount,
        payment_method: payload.payment_method,
        products: productTitles,
        timestamp: new Date().toISOString(),
      };

      // Send payment_success notification
      await processNotification(supabase, "payment_success", userEmail, shortcodeData, webhookPayload);

      // Also send access_granted notification
      if (productTitles.length > 0) {
        const accessWebhookPayload: Record<string, unknown> = {
          event: "access_granted",
          order_id: order.id,
          user_id: order.user_id,
          user_email: userEmail,
          user_name: userName,
          products: productTitles,
          timestamp: new Date().toISOString(),
        };
        await processNotification(supabase, "access_granted", userEmail, shortcodeData, accessWebhookPayload);
      }
    }

    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" },
    });
  }
});