// supabase/functions/send-reminder/index.ts
import { serve } from "https://deno.land/std@0.168.0/http/server.ts";

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

serve(async (req) => {
  if (req.method === "OPTIONS") return new Response("ok", { headers: CORS });
  try {
    const { to, toName, subject, body, provider } = await req.json();
    const fromEmail = Deno.env.get("FROM_EMAIL") ?? "noreply@example.com";
    const fromName  = Deno.env.get("FROM_NAME")  ?? "HR Team";
    let res;

    if (provider === "brevo") {
      const apiKey = Deno.env.get("BREVO_API_KEY") ?? "";
      res = await fetch("https://api.brevo.com/v3/smtp/email", {
        method: "POST",
        headers: { "api-key": apiKey, "Content-Type": "application/json" },
        body: JSON.stringify({
          sender: { name: fromName, email: fromEmail },
          to: [{ email: to, name: toName }],
          replyTo: { email: fromEmail },
          subject,
          textContent: body,
        }),
      });
    } else {
      const apiKey = Deno.env.get("RESEND_API_KEY") ?? "";
      res = await fetch("https://api.resend.com/emails", {
        method: "POST",
        headers: { Authorization: `Bearer ${apiKey}`, "Content-Type": "application/json" },
        body: JSON.stringify({
          from: `${fromName} <${fromEmail}>`,
          to:   [`${toName} <${to}>`],
          reply_to: fromEmail,
          subject,
          text: body,
        }),
      });
    }

    const data = await res.json();
    return new Response(JSON.stringify(data), {
      headers: { ...CORS, "Content-Type": "application/json" },
      status: res.ok ? 200 : 400,
    });
  } catch (e) {
    return new Response(JSON.stringify({ error: String(e) }), {
      headers: { ...CORS, "Content-Type": "application/json" },
      status: 500,
    });
  }
});