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 NotificationPayload {
  type: "new_sale" | "withdrawal_requested" | "withdrawal_completed" | "withdrawal_rejected";
  collaboratorUserId?: string;
  userId?: string;
  amount?: number;
  productTitle?: string;
  profitAmount?: number;
  profitSharePercentage?: number;
  saleDate?: string;
  paymentReference?: string;
  reason?: string;
  bankInfo?: {
    bankName: string;
    accountNumber: string;
    accountName: string;
  };
}

async function sendEmail(recipient: string, subject: string, content: string): Promise<void> {
  const response = 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_SERVICE_ROLE_KEY")}`,
    },
    body: JSON.stringify({
      recipient,
      subject,
      content,
    }),
  });

  if (!response.ok) {
    const text = await response.text();
    throw new Error(`send-email-v2 failed: ${response.status} ${text}`);
  }
}

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

  try {
    const supabase = createClient(
      Deno.env.get("SUPABASE_URL")!,
      Deno.env.get("SUPABASE_SERVICE_ROLE_KEY")!,
      {
        auth: {
          autoRefreshToken: false,
          persistSession: false,
        },
      },
    );

    const data = await req.json() as NotificationPayload;
    const { type } = data;

    let recipientEmail = "";
    let subject = "";
    let htmlContent = "";

    if (type === "new_sale") {
      const { data: collaborator } = await supabase
        .from("profiles")
        .select("email, name")
        .eq("id", data.collaboratorUserId || "")
        .maybeSingle();

      recipientEmail = collaborator?.email || "";
      subject = `🎉 You earned Rp ${(data.profitAmount || 0).toLocaleString("id-ID")} from ${data.productTitle || "your product"}!`;
      htmlContent = `
        <h2>Great news, ${collaborator?.name || "Partner"}!</h2>
        <p>Your collaborative webinar <strong>${data.productTitle || "-"}</strong> just made a sale.</p>
        <ul>
          <li>Your Share: ${data.profitSharePercentage || 0}%</li>
          <li>Profit Earned: <strong>Rp ${(data.profitAmount || 0).toLocaleString("id-ID")}</strong></li>
          <li>Sale Date: ${data.saleDate ? new Date(data.saleDate).toLocaleDateString("id-ID") : "-"}</li>
        </ul>
      `;
    } else if (type === "withdrawal_requested") {
      const { data: adminRole } = await supabase
        .from("user_roles")
        .select("user_id")
        .eq("role", "admin")
        .limit(1)
        .maybeSingle();

      const { data: admin } = await supabase
        .from("profiles")
        .select("email")
        .eq("id", adminRole?.user_id || "")
        .maybeSingle();

      recipientEmail = admin?.email || "";
      subject = "💸 New Withdrawal Request";
      htmlContent = `
        <h2>New Withdrawal Request</h2>
        <p>A collaborator has requested withdrawal:</p>
        <ul>
          <li>Amount: <strong>Rp ${(data.amount || 0).toLocaleString("id-ID")}</strong></li>
          <li>Bank: ${data.bankInfo?.bankName || "-"}</li>
          <li>Account: ${data.bankInfo?.accountNumber || "-"} (${data.bankInfo?.accountName || "-"})</li>
        </ul>
      `;
    } else if (type === "withdrawal_completed") {
      const { data: user } = await supabase
        .from("profiles")
        .select("email, name")
        .eq("id", data.userId || "")
        .maybeSingle();

      recipientEmail = user?.email || "";
      subject = `✅ Withdrawal Completed: Rp ${(data.amount || 0).toLocaleString("id-ID")}`;
      htmlContent = `
        <h2>Withdrawal Completed, ${user?.name || "Partner"}!</h2>
        <ul>
          <li>Amount: <strong>Rp ${(data.amount || 0).toLocaleString("id-ID")}</strong></li>
          <li>Payment Reference: ${data.paymentReference || "-"}</li>
        </ul>
      `;
    } else if (type === "withdrawal_rejected") {
      const { data: user } = await supabase
        .from("profiles")
        .select("email, name")
        .eq("id", data.userId || "")
        .maybeSingle();

      recipientEmail = user?.email || "";
      subject = "❌ Withdrawal Request Returned";
      htmlContent = `
        <h2>Withdrawal Request Returned</h2>
        <p>Hi ${user?.name || "Partner"},</p>
        <p>Your withdrawal request of <strong>Rp ${(data.amount || 0).toLocaleString("id-ID")}</strong> has been returned to your wallet.</p>
        <p>Reason: ${data.reason || "Contact admin for details"}</p>
      `;
    } else {
      return new Response(
        JSON.stringify({ error: "Unknown notification type" }),
        { status: 400, headers: { ...corsHeaders, "Content-Type": "application/json" } },
      );
    }

    if (!recipientEmail) {
      return new Response(
        JSON.stringify({ error: "Recipient email not found" }),
        { status: 400, headers: { ...corsHeaders, "Content-Type": "application/json" } },
      );
    }

    await sendEmail(recipientEmail, subject, htmlContent);

    return new Response(
      JSON.stringify({ success: true }),
      { status: 200, headers: { ...corsHeaders, "Content-Type": "application/json" } },
    );
  } catch (error: unknown) {
    const message = error instanceof Error ? error.message : "Failed to send notification";
    return new Response(
      JSON.stringify({ error: message }),
      { status: 500, headers: { ...corsHeaders, "Content-Type": "application/json" } },
    );
  }
});