import { validateExternalAuth } from "../_shared/auth.ts";

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

Deno.serve(async (req) => {
  if (req.method === "OPTIONS")
    return new Response("ok", { status: 200, headers: corsHeaders() });

  try {
    const authHeader = req.headers.get("Authorization");
    const supabase = createClient(
      Deno.env.get("SUPABASE_URL")!,
      Deno.env.get("SUPABASE_ANON_KEY")!,
      { global: { headers: { Authorization: authHeader! } } }
    );

    const {
      data: { user },
    } = await supabase.auth.getUser();
    if (!user) throw new Error("Unauthorized");

    const { external_user_id, channel, enabled } = await req.json();
    if (!external_user_id || !channel)
      throw new Error("external_user_id and channel required");

    const { data, error } = await supabase
      .from("notification_subscriptions")
      .upsert(
        {
          external_user_id,
          channel, // 'sms', 'email', 'whatsapp'
          enabled: enabled !== false,
          updated_at: new Date().toISOString(),
        },
        { onConflict: "external_user_id,channel" }
      )
      .select()
      .single();

    if (error) throw error;

    return new Response(JSON.stringify({ success: true, data }), {
      headers: { ...corsHeaders, "Content-Type": "application/json" },
    });
  } catch (error: any) {
    return new Response(
      JSON.stringify({ success: false, error: error.message }),
      {
        status: 400,
        headers: { ...corsHeaders, "Content-Type": "application/json" },
      }
    );
  }
});