/*
 * Copyright (c) 2021 Espressif Systems (Shanghai) CO LTD
 * All rights reserved.
 *
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Espressif Systems
 *    integrated circuit in a product or a software update for such product,
 *    must reproduce the above copyright notice, this list of conditions and
 *    the following disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * 4. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "switch_driver.h"

/**
 * @brief:
 * This example code shows how to configure light switch with attribute as well as button switch handler.
 *
 * @note:
   Currently only support toggle switch functionality available
 *
 * @note:
 * For other possible switch functions (on/off,level up/down,step up/down). User need to implement and create them by themselves
 */

static xQueueHandle gpio_evt_queue = NULL;
/* button function pair, should be defined in switch example source file */
static switch_func_pair_t *switch_func_pair;
/* call back function pointer */
static esp_switch_callback_t func_ptr;
/* which button is pressed */
static uint8_t switch_num;
static const char *TAG = "ESP_ZB_SWITCH";

static void IRAM_ATTR gpio_isr_handler(void *arg)
{
    xQueueSendFromISR(gpio_evt_queue, (switch_func_pair_t *)arg, NULL);
}

/**
 * @brief Enable GPIO (switchs refer to) isr
 *
 * @param enabled      enable isr if true.
 */
static void switch_driver_gpios_intr_enabled(bool enabled)
{
    for (int i = 0; i < switch_num; ++i) {
        if (enabled) {
            gpio_intr_enable((switch_func_pair + i)->pin);
        } else {
            gpio_intr_disable((switch_func_pair + i)->pin);
        }
    }
}

/**
 * @brief Tasks for checking the button event and debounce the switch state
 *
 * @param arg      Unused value.
 */
static void switch_driver_button_detected(void *arg)
{
    gpio_num_t io_num = GPIO_NUM_NC;
    switch_func_pair_t button_func_pair;
    static switch_state_t switch_state = SWITCH_IDLE;
    bool evt_flag = false;

    for (;;) {
        /* check if there is any queue received, if yes read out the button_func_pair */
        if (xQueueReceive(gpio_evt_queue, &button_func_pair, portMAX_DELAY)) {
            io_num =  button_func_pair.pin;
            switch_driver_gpios_intr_enabled(false);
            evt_flag = true;
        }
        while (evt_flag) {
            bool value = gpio_get_level(io_num);
            switch (switch_state) {
            case SWITCH_IDLE:
                switch_state = (value == GPIO_INPUT_LEVEL_ON) ? SWITCH_PRESS_DETECTED : SWITCH_IDLE;
                break;
            case SWITCH_PRESS_DETECTED:
                switch_state = (value == GPIO_INPUT_LEVEL_ON) ? SWITCH_PRESS_DETECTED : SWITCH_RELEASE_DETECTED;
                break;
            case SWITCH_RELEASE_DETECTED:
                switch_state = SWITCH_IDLE;
                /* callback to button_handler */
                (*func_ptr)(button_func_pair);
                break;
            default:
                break;
            }
            if (switch_state == SWITCH_IDLE) {
                switch_driver_gpios_intr_enabled(true);
                evt_flag = false;
                break;
            }
            vTaskDelay(10 / portTICK_RATE_MS);
        }
    }
}

/**
 * @brief init GPIO configuration as well as isr
 *
 * @param button_func_pair      pointer of the button pair.
 * @param button_num            number of button pair.
 */
static bool switch_driver_gpio_init(switch_func_pair_t *button_func_pair, uint8_t button_num)
{
    gpio_config_t io_conf = {};
    switch_func_pair = button_func_pair;
    switch_num = button_num;
    uint64_t pin_bit_mask = 0;

    /* set up button func pair pin mask */
    for (int i = 0; i < button_num; ++i) {
        pin_bit_mask |= (1ULL << (button_func_pair + i)->pin);
    }
    /* interrupt of falling edge */
    io_conf.intr_type = GPIO_INTR_NEGEDGE;
    io_conf.pin_bit_mask = pin_bit_mask;
    io_conf.mode = GPIO_MODE_INPUT;
    io_conf.pull_up_en = 1;
    /* configure GPIO with the given settings */
    gpio_config(&io_conf);
    /* create a queue to handle gpio event from isr */
    gpio_evt_queue = xQueueCreate(10, sizeof(switch_func_pair_t));
    if ( gpio_evt_queue == 0) {
        ESP_LOGE(TAG, "Queue was not created and must not be used");
        return false;
    }
    /* start gpio task */
    xTaskCreate(switch_driver_button_detected, "button_detected", 2048, NULL, 10, NULL);
    /* install gpio isr service */
    gpio_install_isr_service(ESP_INTR_FLAG_DEFAULT);
    for (int i = 0; i < button_num; ++i) {
        gpio_isr_handler_add((button_func_pair + i)->pin, gpio_isr_handler, (void *) (button_func_pair + i));
    }
    return true;
}

bool switch_driver_init(switch_func_pair_t *button_func_pair, uint8_t button_num, esp_switch_callback_t cb)
{
    if (!switch_driver_gpio_init(button_func_pair, button_num)) {
        return false;
    }
    func_ptr = cb;
    return true;
}