amberjs 1.16.1

// Payment Request API implementation for Web standard
// v0.3.328: Payment Request API for secure payment processing
// Provides PaymentRequest, PaymentResponse, and related types

use anyhow::Result;
use rusty_v8 as v8;

/// Payment request state
#[derive(Debug, Clone, PartialEq)]
pub enum PaymentRequestState {
    Created,     // PaymentRequest has been created
    Interactive, // PaymentRequest is showing the payment UI
    Closed,      // PaymentRequest has been closed (completed or cancelled)
}

/// Setup Payment Request API in V8 context
pub fn setup_payment_request_api(
    scope: &mut v8::ContextScope<v8::HandleScope>,
    context: &v8::Local<v8::Context>,
    _global: v8::Local<v8::Object>,
) -> Result<()> {
    let global = context.global(scope);

    // PaymentRequest constructor
    let payment_request_fn = v8::FunctionTemplate::new(scope, payment_request_constructor_callback);
    let payment_request_constructor = payment_request_fn.get_function(scope).unwrap();
    let payment_request_key = v8::String::new(scope, "PaymentRequest").unwrap();
    global.set(
        scope,
        payment_request_key.into(),
        payment_request_constructor.into(),
    );

    // PaymentResponse constructor (for internal use)
    let payment_response_fn =
        v8::FunctionTemplate::new(scope, payment_response_constructor_callback);
    let payment_response_constructor = payment_response_fn.get_function(scope).unwrap();
    let payment_response_key = v8::String::new(scope, "PaymentResponse").unwrap();
    global.set(
        scope,
        payment_response_key.into(),
        payment_response_constructor.into(),
    );

    // PaymentAddress constructor (for internal use)
    let payment_address_fn = v8::FunctionTemplate::new(scope, payment_address_constructor_callback);
    let payment_address_constructor = payment_address_fn.get_function(scope).unwrap();
    let payment_address_key = v8::String::new(scope, "PaymentAddress").unwrap();
    global.set(
        scope,
        payment_address_key.into(),
        payment_address_constructor.into(),
    );

    Ok(())
}

/// PaymentRequest constructor callback
fn payment_request_constructor_callback(
    scope: &mut v8::PinScope,
    args: v8::FunctionCallbackArguments,
    mut rv: v8::ReturnValue,
) {
    // Get methodData (payment methods) from first argument
    let _method_data = if args.length() > 0 {
        args.get(0)
    } else {
        rv.set(v8::undefined(scope).into());
        return;
    };

    // Get details (payment amount, etc.) from second argument
    let _details = if args.length() > 1 {
        args.get(1)
    } else {
        v8::undefined(scope).into()
    };

    // Get options (shipping options, etc.) from third argument
    let _options = if args.length() > 2 {
        args.get(2)
    } else {
        v8::undefined(scope).into()
    };

    // Create PaymentRequest object
    let pr_obj = v8::Object::new(scope);

    // Store undefined in a local to avoid multiple mutable borrows
    let undefined_val: v8::Local<v8::Value> = v8::undefined(scope).into();

    // id property (unique identifier for this payment request)
    let id_key = v8::String::new(scope, "id").unwrap();
    let id_val = v8::String::new(scope, "payment-req-12345").unwrap();
    pr_obj.set(scope, id_key.into(), id_val.into());

    // method property (selected payment method)
    let method_key = v8::String::new(scope, "method").unwrap();
    pr_obj.set(scope, method_key.into(), undefined_val);

    // shippingAddress property
    let shipping_addr_key = v8::String::new(scope, "shippingAddress").unwrap();
    pr_obj.set(scope, shipping_addr_key.into(), undefined_val);

    // shippingOption property
    let shipping_opt_key = v8::String::new(scope, "shippingOption").unwrap();
    pr_obj.set(scope, shipping_opt_key.into(), undefined_val);

    // show() method
    let show_fn = v8::FunctionTemplate::new(scope, payment_request_show_callback);
    let show_key = v8::String::new(scope, "show").unwrap();
    let show_func = show_fn.get_function(scope).unwrap();
    pr_obj.set(scope, show_key.into(), show_func.into());

    // abort() method
    let abort_fn = v8::FunctionTemplate::new(scope, payment_request_abort_callback);
    let abort_key = v8::String::new(scope, "abort").unwrap();
    let abort_func = abort_fn.get_function(scope).unwrap();
    pr_obj.set(scope, abort_key.into(), abort_func.into());

    // canMakePayment() method
    let can_pay_fn = v8::FunctionTemplate::new(scope, payment_request_can_make_payment_callback);
    let can_pay_key = v8::String::new(scope, "canMakePayment").unwrap();
    let can_pay_func = can_pay_fn.get_function(scope).unwrap();
    pr_obj.set(scope, can_pay_key.into(), can_pay_func.into());

    rv.set(pr_obj.into());
}

/// PaymentRequest.show() callback - shows the payment UI
fn payment_request_show_callback(
    scope: &mut v8::PinScope,
    _args: v8::FunctionCallbackArguments,
    mut rv: v8::ReturnValue,
) {
    // Create a promise that resolves to a PaymentResponse
    let resolver = match v8::PromiseResolver::new(scope) {
        Some(r) => r,
        None => {
            let error = v8::String::new(scope, "Failed to create promise resolver").unwrap();
            scope.throw_exception(error.into());
            return;
        }
    };
    let promise = resolver.get_promise(scope);
    rv.set(promise.into());

    let message = v8::String::new(scope, "Payment Request is not supported yet").unwrap();
    let error = v8::Exception::error(scope, message);
    resolver.reject(scope, error);
}

/// PaymentRequest.abort() callback - cancels the payment request
fn payment_request_abort_callback(
    scope: &mut v8::PinScope,
    _args: v8::FunctionCallbackArguments,
    mut rv: v8::ReturnValue,
) {
    // Create a promise that resolves when abort is complete
    let resolver = match v8::PromiseResolver::new(scope) {
        Some(r) => r,
        None => {
            let error = v8::String::new(scope, "Failed to create promise resolver").unwrap();
            scope.throw_exception(error.into());
            return;
        }
    };
    let promise = resolver.get_promise(scope);
    rv.set(promise.into());

    let message = v8::String::new(scope, "Payment Request is not supported yet").unwrap();
    let error = v8::Exception::error(scope, message);
    resolver.reject(scope, error);
}

/// PaymentRequest.canMakePayment() callback - checks if payment can be made
fn payment_request_can_make_payment_callback(
    scope: &mut v8::PinScope,
    _args: v8::FunctionCallbackArguments,
    mut rv: v8::ReturnValue,
) {
    // Create a promise that resolves to a boolean
    let resolver = match v8::PromiseResolver::new(scope) {
        Some(r) => r,
        None => {
            let error = v8::String::new(scope, "Failed to create promise resolver").unwrap();
            scope.throw_exception(error.into());
            return;
        }
    };
    let promise = resolver.get_promise(scope);
    rv.set(promise.into());

    let can_pay = v8::Boolean::new(scope, false);
    resolver.resolve(scope, can_pay.into());
}

/// PaymentResponse constructor callback (for creating response objects)
fn payment_response_constructor_callback(
    scope: &mut v8::PinScope,
    _args: v8::FunctionCallbackArguments,
    mut rv: v8::ReturnValue,
) {
    let message =
        v8::String::new(scope, "PaymentResponse construction is not supported yet").unwrap();
    let error = v8::Exception::type_error(scope, message);
    scope.throw_exception(error);
    rv.set(v8::undefined(scope).into());
}

/// PaymentAddress constructor callback (for address objects)
fn payment_address_constructor_callback(
    scope: &mut v8::PinScope,
    _args: v8::FunctionCallbackArguments,
    mut rv: v8::ReturnValue,
) {
    let message =
        v8::String::new(scope, "PaymentAddress construction is not supported yet").unwrap();
    let error = v8::Exception::type_error(scope, message);
    scope.throw_exception(error);
    rv.set(v8::undefined(scope).into());
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_payment_request_state_values() {
        assert_eq!(PaymentRequestState::Created as u8, 0);
        assert_eq!(PaymentRequestState::Interactive as u8, 1);
        assert_eq!(PaymentRequestState::Closed as u8, 2);
    }

    #[test]
    fn test_payment_request_state_ordering() {
        // Verify the logical ordering of states
        assert_eq!(PaymentRequestState::Created as u8, 0);
        assert_eq!(PaymentRequestState::Interactive as u8, 1);
        assert_eq!(PaymentRequestState::Closed as u8, 2);
    }
}