import { define } from "../../../utils.ts";
import { createPaymentTransaction } from "../../../services/paymentService.ts";

type CreateIntentBody = {
  lease_id: string;
  amount: number;
  payment_method?: string;
  currency?: string;
};

export const handler = define.handlers({
  async POST(ctx) {
    try {
      const body = await ctx.req.json() as CreateIntentBody;
      const { lease_id, amount, payment_method = "ach", currency = "usd" } =
        body || {} as CreateIntentBody;

      if (!lease_id || !amount || Number.isNaN(amount)) {
        return new Response(
          JSON.stringify({ success: false, error: "Invalid request body" }),
          { status: 400, headers: { "Content-Type": "application/json" } },
        );
      }

      const sandbox = Deno.env.get("DISABLE_EXTERNAL_APIS") === "true" ||
        Deno.env.get("SANDBOX_MODE") === "true";

      if (sandbox) {
        const localId = `pi_local_${crypto.randomUUID()}`;
        const [transaction] = await createPaymentTransaction(
          lease_id,
          amount,
          Date.now(),
          payment_method,
          "completed",
          localId,
        );
        return new Response(
          JSON.stringify({ success: true, mode: "local", transaction }),
          { status: 200, headers: { "Content-Type": "application/json" } },
        );
      }

      // Production Stripe flow (guarded by env flags)
      const secret = Deno.env.get("STRIPE_SECRET_KEY");
      if (!secret) {
        return new Response(
          JSON.stringify({ success: false, error: "Stripe not configured" }),
          { status: 500, headers: { "Content-Type": "application/json" } },
        );
      }

      const params = new URLSearchParams();
      params.set("amount", String(Math.round(amount * 100)));
      params.set("currency", currency);
      params.set("automatic_payment_methods[enabled]", "true");

      const resp = await fetch("https://api.stripe.com/v1/payment_intents", {
        method: "POST",
        headers: {
          "Authorization": `Bearer ${secret}`,
          "Content-Type": "application/x-www-form-urlencoded",
        },
        body: params.toString(),
      });

      if (!resp.ok) {
        const text = await resp.text();
        return new Response(
          JSON.stringify({ success: false, error: text }),
          { status: 502, headers: { "Content-Type": "application/json" } },
        );
      }

      const pi = await resp.json();
      return new Response(
        JSON.stringify({
          success: true,
          mode: "stripe",
          client_secret: pi.client_secret,
          payment_intent_id: pi.id,
        }),
        { status: 200, headers: { "Content-Type": "application/json" } },
      );
    } catch (err) {
      return new Response(
        JSON.stringify({ success: false, error: String(err) }),
        { status: 500, headers: { "Content-Type": "application/json" } },
      );
    }
  },
});