/*
   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/

#include <stdio.h>
#include "esp_log.h"
#include "driver/gpio.h"
#include "driver/ledc.h"
#include "driver/i2c.h"
#include "platform_config.h"
#include "gpio_exp.h"
#include "battery.h"
#include "led.h"
#include "monitor.h"
#include "globdefs.h"
#include "accessors.h"
#include "messaging.h"

extern void battery_svc_init(void);
extern void monitor_svc_init(void);
extern void led_svc_init(void);

int i2c_system_port = I2C_SYSTEM_PORT;
int i2c_system_speed = 400000;
int spi_system_host = SPI_SYSTEM_HOST;
int spi_system_dc_gpio = -1;
pwm_system_t pwm_system = { 
		.timer = LEDC_TIMER_0,
		.base_channel = LEDC_CHANNEL_0,
		.max = (1 << LEDC_TIMER_13_BIT),
	};		

static const char *TAG = "services";

/****************************************************************************************
 * 
 */
void set_chip_power_gpio(int gpio, char *value) {
	bool parsed = true;

	// we only parse on-chip GPIOs
	if (gpio >= GPIO_NUM_MAX) return;
	
	if (!strcasecmp(value, "vcc") ) {
		gpio_pad_select_gpio(gpio);
		gpio_set_direction(gpio, GPIO_MODE_OUTPUT);
		gpio_set_level(gpio, 1);
	} else if (!strcasecmp(value, "gnd")) {
		gpio_pad_select_gpio(gpio);
		gpio_set_direction(gpio, GPIO_MODE_OUTPUT);
		gpio_set_level(gpio, 0);
	} else parsed = false;
	
	if (parsed) ESP_LOGI(TAG, "set GPIO %u to %s", gpio, value);
}	

void set_exp_power_gpio(int gpio, char *value) {
	bool parsed = true;

	// we only parse on-chip GPIOs
	if (gpio < GPIO_NUM_MAX) return;
	
	if (!strcasecmp(value, "vcc") ) {
		gpio_exp_set_direction(gpio, GPIO_MODE_OUTPUT, NULL);
		gpio_exp_set_level(gpio, 1, true, NULL);
	} else if (!strcasecmp(value, "gnd")) {
		gpio_exp_set_direction(gpio, GPIO_MODE_OUTPUT, NULL);
		gpio_exp_set_level(gpio, 0, true, NULL);
	} else parsed = false;
	
	if (parsed) ESP_LOGI(TAG, "set expanded GPIO %u to %s", gpio, value);
 }	
 

/****************************************************************************************
 * 
 */
void services_init(void) {
	messaging_service_init();
	gpio_install_isr_service(0);
	
#ifdef CONFIG_I2C_LOCKED
	if (i2c_system_port == 0) {
		i2c_system_port = 1;
		ESP_LOGE(TAG, "Port 0 is reserved for internal DAC use");
	}
#endif

	// set potential power GPIO on chip first in case expanders are power using these
	parse_set_GPIO(set_chip_power_gpio);

	// shared I2C bus 
	const i2c_config_t * i2c_config = config_i2c_get(&i2c_system_port);
	ESP_LOGI(TAG,"Configuring I2C sda:%d scl:%d port:%u speed:%u", i2c_config->sda_io_num, i2c_config->scl_io_num, i2c_system_port, i2c_config->master.clk_speed);

	if (i2c_config->sda_io_num != -1 && i2c_config->scl_io_num != -1) {
		i2c_param_config(i2c_system_port, i2c_config);
		i2c_driver_install(i2c_system_port, i2c_config->mode, 0, 0, 0 );
	} else {
		i2c_system_port = -1;
		ESP_LOGW(TAG, "no I2C configured");
	}	

	const spi_bus_config_t * spi_config = config_spi_get((spi_host_device_t*) &spi_system_host);
	ESP_LOGI(TAG,"Configuring SPI mosi:%d miso:%d clk:%d host:%u dc:%d", spi_config->mosi_io_num, spi_config->miso_io_num, spi_config->sclk_io_num, spi_system_host, spi_system_dc_gpio);
	
	if (spi_config->mosi_io_num != -1 && spi_config->sclk_io_num != -1) {
		spi_bus_initialize( spi_system_host, spi_config, 1 );
		if (spi_system_dc_gpio != -1) {
			gpio_set_direction( spi_system_dc_gpio, GPIO_MODE_OUTPUT );
			gpio_set_level( spi_system_dc_gpio, 0 );
		} else {
			ESP_LOGW(TAG, "No DC GPIO set, SPI display will not work");
		}	
	} else {
		spi_system_host = -1;
		ESP_LOGW(TAG, "no SPI configured");
	}	

	// create GPIO expanders
	const gpio_exp_config_t* gpio_exp_config;
	for (int count = 0; (gpio_exp_config = config_gpio_exp_get(count)); count++) gpio_exp_create(gpio_exp_config);

	// now set potential power GPIO on expander 
	parse_set_GPIO(set_exp_power_gpio);

	// system-wide PWM timer configuration
	ledc_timer_config_t pwm_timer = {
		.duty_resolution = LEDC_TIMER_13_BIT, 
		.freq_hz = 5000,                     
		.speed_mode = LEDC_HIGH_SPEED_MODE,  
		.timer_num = pwm_system.timer,
	};
	
	ledc_timer_config(&pwm_timer);

	led_svc_init();
	battery_svc_init();
	monitor_svc_init();
}