/* Copyright JS Foundation and other contributors, http://js.foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "jerryscript-mbed-util/logging.h"
#include "jerryscript-mbed-event-loop/EventLoop.h"
#include "jerryscript-mbed-library-registry/wrap_tools.h"

#include "mbed.h"

/**
 * InterruptIn#destructor
 *
 * Called if/when the InterruptIn object is GC'ed.
 */
void NAME_FOR_CLASS_NATIVE_DESTRUCTOR(InterruptIn) (void *void_ptr) {
    InterruptIn *native_ptr = static_cast<InterruptIn*>(void_ptr);

    native_ptr->rise(0);
    native_ptr->fall(0);
    delete native_ptr;
}

/**
 * Type infomation of the native InterruptIn pointer
 *
 * Set InterruptIn#destructor as the free callback.
 */
static const jerry_object_native_info_t native_obj_type_info = {
    .free_cb = NAME_FOR_CLASS_NATIVE_DESTRUCTOR(InterruptIn)
};

/**
 * InterruptIn#rise (native JavaScript method)
 *
 * Register a rise callback for an InterruptIn
 *
 * @param cb Callback function, or null to detach previously attached callback.
 */
DECLARE_CLASS_FUNCTION(InterruptIn, rise) {
    CHECK_ARGUMENT_COUNT(InterruptIn, rise, (args_count == 1));

    // Detach the rise callback when InterruptIn::rise(null) is called
    if (jerry_value_is_null(args[0])) {
        void *void_ptr;
        bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &native_obj_type_info);

        if (!has_ptr) {
            return jerry_create_error(JERRY_ERROR_TYPE,
                                      (const jerry_char_t *) "Failed to get native InterruptIn pointer");
        }

        InterruptIn *native_ptr = static_cast<InterruptIn*>(void_ptr);

        jerry_value_t property_name = jerry_create_string((const jerry_char_t*)"cb_rise");
        jerry_value_t cb_func = jerry_get_property(this_obj, property_name);
        jerry_release_value(property_name);

        // Only drop the callback if it exists
        if (jerry_value_is_function(cb_func)) {
            // Ensure that the EventLoop frees memory used by the callback.
            mbed::js::EventLoop::getInstance().dropCallback(cb_func);
        }
        jerry_release_value(cb_func);

        native_ptr->rise(0);

        return jerry_create_undefined();
    }

    // Assuming we actually have a callback now...
    CHECK_ARGUMENT_TYPE_ALWAYS(InterruptIn, rise, 0, function);

    void *void_ptr;
    bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &native_obj_type_info);

    if (!has_ptr) {
        return jerry_create_error(JERRY_ERROR_TYPE,
                                  (const jerry_char_t *) "Failed to get native InterruptIn pointer");
    }

    InterruptIn *native_ptr = static_cast<InterruptIn*>(void_ptr);

    jerry_value_t f = args[0];

    // Pass the function to EventLoop.
    mbed::Callback<void()> cb = mbed::js::EventLoop::getInstance().wrapFunction(f);
    native_ptr->rise(cb);

    // Keep track of our callback internally.
    jerry_value_t property_name = jerry_create_string((const jerry_char_t*)"cb_rise");
    jerry_release_value(jerry_set_property(this_obj, property_name, f));
    jerry_release_value(property_name);

    return jerry_create_undefined();
}

/**
 * InterruptIn#fall (native JavaScript method)
 *
 * Register a fall callback for an InterruptIn
 *
 * @param cb Callback function, or null to detach previously attached callback.
 */
DECLARE_CLASS_FUNCTION(InterruptIn, fall) {
    CHECK_ARGUMENT_COUNT(InterruptIn, fall, (args_count == 1));

    // Detach the fall callback when InterruptIn::fall(null) is called
    if (jerry_value_is_null(args[0])) {
        void *void_ptr;
        bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &native_obj_type_info);

        if (!has_ptr) {
            return jerry_create_error(JERRY_ERROR_TYPE,
                                      (const jerry_char_t *) "Failed to get native InterruptIn pointer");
        }

        InterruptIn *native_ptr = static_cast<InterruptIn*>(void_ptr);

        jerry_value_t property_name = jerry_create_string((const jerry_char_t*)"cb_fall");
        jerry_value_t cb_func = jerry_get_property(this_obj, property_name);
        jerry_release_value(property_name);

        // Only drop the callback if it exists
        if (jerry_value_is_function(cb_func)) {
            // Ensure that the EventLoop frees memory used by the callback.
            mbed::js::EventLoop::getInstance().dropCallback(cb_func);
        }
        jerry_release_value(cb_func);

        native_ptr->fall(0);

        return jerry_create_undefined();
    }

    // Assuming we actually have a callback now...
    CHECK_ARGUMENT_TYPE_ALWAYS(InterruptIn, fall, 0, function);

    void *void_ptr;
    bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &native_obj_type_info);

    if (!has_ptr) {
        return jerry_create_error(JERRY_ERROR_TYPE,
                                  (const jerry_char_t *) "Failed to get native InterruptIn pointer");
    }

    InterruptIn *native_ptr = static_cast<InterruptIn*>(void_ptr);

    jerry_value_t f = args[0];

    // Pass the function to EventLoop.
    mbed::Callback<void()> cb = mbed::js::EventLoop::getInstance().wrapFunction(f);
    native_ptr->fall(cb);

    // Keep track of our callback internally.
    jerry_value_t property_name = jerry_create_string((const jerry_char_t*)"cb_fall");
    jerry_release_value(jerry_set_property(this_obj, property_name, f));
    jerry_release_value(property_name);

    return jerry_create_undefined();
}

/**
 * InterruptIn#mode (native JavaScript method)
 *
 * Set the mode of the InterruptIn pin.
 *
 * @param mode PullUp, PullDown, PullNone
 */
DECLARE_CLASS_FUNCTION(InterruptIn, mode) {
    CHECK_ARGUMENT_COUNT(InterruptIn, mode, (args_count == 1));
    CHECK_ARGUMENT_TYPE_ALWAYS(InterruptIn, mode, 0, number);

    void *void_ptr;
    bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &native_obj_type_info);

    if (!has_ptr) {
        return jerry_create_error(JERRY_ERROR_TYPE,
                                  (const jerry_char_t *) "Failed to get native InterruptIn pointer");
    }

    InterruptIn *native_ptr = static_cast<InterruptIn*>(void_ptr);

    int pull = jerry_get_number_value(args[0]);
    native_ptr->mode((PinMode)pull);

    return jerry_create_undefined();
}

/**
 * InterruptIn#disable_irq (native JavaScript method)
 *
 * Disable IRQ. See InterruptIn.h in mbed-os sources for more details.
 */
DECLARE_CLASS_FUNCTION(InterruptIn, disable_irq) {
    CHECK_ARGUMENT_COUNT(InterruptIn, disable_irq, (args_count == 0));

    void *void_ptr;
    bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &native_obj_type_info);

    if (!has_ptr) {
        return jerry_create_error(JERRY_ERROR_TYPE,
                                  (const jerry_char_t *) "Failed to get native InterruptIn pointer");
    }

    InterruptIn *native_ptr = static_cast<InterruptIn*>(void_ptr);

    native_ptr->disable_irq();
    return jerry_create_undefined();
}

/**
 * InterruptIn#enable_irq (native JavaScript method)
 *
 * Enable IRQ. See InterruptIn.h in mbed-os sources for more details.
 */
DECLARE_CLASS_FUNCTION(InterruptIn, enable_irq) {
    CHECK_ARGUMENT_COUNT(InterruptIn, enable_irq, (args_count == 0));

    void *void_ptr;
    bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &native_obj_type_info);

    if (!has_ptr) {
        return jerry_create_error(JERRY_ERROR_TYPE,
                                  (const jerry_char_t *) "Failed to get native InterruptIn pointer");
    }

    InterruptIn *native_ptr = static_cast<InterruptIn*>(void_ptr);

    native_ptr->enable_irq();
    return jerry_create_undefined();
}

/**
 * InterruptIn (native JavaScript constructor)
 *
 * @param pin PinName
 *
 * @returns JavaScript object wrapping InterruptIn native object
 */
DECLARE_CLASS_CONSTRUCTOR(InterruptIn) {
    CHECK_ARGUMENT_COUNT(InterruptIn, __constructor, (args_count == 1));
    CHECK_ARGUMENT_TYPE_ALWAYS(InterruptIn, __constructor, 0, number);
    int pin = jerry_get_number_value(args[0]);

    InterruptIn *native_ptr = new InterruptIn((PinName)pin);
    jerry_value_t js_object = jerry_create_object();

    jerry_set_object_native_pointer(js_object, native_ptr, &native_obj_type_info);

    ATTACH_CLASS_FUNCTION(js_object, InterruptIn, rise);
    ATTACH_CLASS_FUNCTION(js_object, InterruptIn, fall);
    ATTACH_CLASS_FUNCTION(js_object, InterruptIn, mode);
    ATTACH_CLASS_FUNCTION(js_object, InterruptIn, enable_irq);
    ATTACH_CLASS_FUNCTION(js_object, InterruptIn, disable_irq);

    return js_object;
}