frappe.ui.form.on("Sales Invoice", {
    refresh(frm) {
        frm.clear_custom_buttons();

        // Submitted invoices only
        if (frm.doc.docstatus !== 1) return;
        if (!frm.doc.customer) return;

        // Only show manual payment button if AutoPay is OFF
        frappe.db.get_value(
            "Customer",
            frm.doc.customer,
            "auto_pay",
            (r) => {
                if (!r) return;

                if (!r.auto_pay) {
                    frm.add_custom_button(
                        "Run Payment",
                        () => run_payment_flow(frm),
                        "Actions"
                    );
                }
            }
        );
    }
});


function run_payment_flow(frm) {
    frappe.call({
        method: "ns_app.api.payments.check_autopay",
        args: {
            customer: frm.doc.customer
        },
        callback(r) {
            if (!r.message) return;

            if (r.message.autopay_enabled) {
                run_autopay(frm);
            } else {
                open_manual_payment_form(frm);
            }
        }
    });
}


function run_autopay(frm) {
    frappe.confirm(
        `Run AutoPay for $${frm.doc.outstanding_amount}?`,
        () => {
            frappe.call({
                method: "ns_app.api.payments.run_autopay_payment",
                args: {
                    invoice: frm.doc.name
                },
                callback(r) {
                    frappe.msgprint(r.message || "Payment processed");
                    frm.reload_doc();
                }
            });
        }
    );
}


// Hosted checkout 
function open_manual_payment_form(frm) {
    frappe.call({
        method: "ns_app.api.payments.get_collect_checkout_url",
        args: {
            invoice: frm.doc.name
        },
        callback(r) {
            if (!r.message) {
                frappe.msgprint("Unable to start payment");
                return;
            }

            const dialog = new frappe.ui.Dialog({
                title: "Secure Payment",
                size: "large",
                fields: [
                    {
                        fieldtype: "HTML",
                        fieldname: "payment_form",
                        options: `
                            <iframe
                                src="${r.message}"
                                style="width:100%; height:520px; border:none;"
                                sandbox="allow-forms allow-scripts allow-same-origin"
                            ></iframe>
                        `
                    }
                ]
            });

            dialog.show();
        }
    });
}