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#define LOG_LOCAL_LEVEL ESP_LOG_VERBOSE
#include "ics43434.h"
#include "buffer.h"
#include "esp_err.h"
#include "esp_log.h"
#include "driver/i2s.h"
#include <errno.h>

/** ISR **/
static void IRAM_ATTR dmaInt(void* arg) {
	uint32_t numBytesRead = 0;
	//this is an isr, there should be a i2s_event ready for us, so DON'T WAIT!
	if (i2s_read(I2S_NUM_1, Buffer::getCurrent(), DMA_SIZE,
			&numBytesRead, 0) == ESP_OK) {
		if (numBytesRead == DMA_SIZE) Buffer::advance();
	};
	//PS: OH BY THE WAY... how do we qualify that we are interrupted for a read??? can we cast "arg"?
}

//anonymous
namespace {
intr_handle_t i2s_interrupt;

static const char *TAG = "ics4343.cpp";
/* RX: I2S_NUM_1 */
#define I2S_CLOCK GPIO_NUM_25
#define I2S_WS GPIO_NUM_26
#define I2S_DIN GPIO_NUM_22

//incase the issue has something to do with DACs I tried other pins too eg:
//#define I2S_CLOCK GPIO_NUM_18
//#define I2S_WS GPIO_NUM_19
//#define I2S_DIN GPIO_NUM_23
//the results were the same

i2s_config_t i2s_config_rx;
i2s_pin_config_t pin_config_rx = { bck_io_num: I2S_CLOCK, ws_io_num: I2S_WS,
		data_out_num : I2S_PIN_NO_CHANGE, data_in_num: GPIO_NUM_22 };

void setupInterrupt() {
	esp_err_t err = esp_intr_alloc(ETS_I2S1_INTR_SOURCE,
	ESP_INTR_FLAG_INTRDISABLED | ESP_INTR_FLAG_LEVEL1 | ESP_INTR_FLAG_IRAM,
			&dmaInt,
			NULL, &i2s_interrupt);
	if (err != ESP_OK)
		ESP_LOGE(TAG, "Error esp_intr_alloc %s", esp_err_to_name(err));
}
}

bool Ics43434::setup() {
	//stuff the configuration
	i2s_config_rx.mode = (i2s_mode_t) (I2S_MODE_MASTER | I2S_MODE_RX);
	i2s_config_rx.sample_rate = AUDIO_SAMPLE_RATE;
	i2s_config_rx.bits_per_sample = I2S_BITS_PER_SAMPLE_24BIT;
	i2s_config_rx.channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT;   // 2-channels
	i2s_config_rx.communication_format =
			(i2s_comm_format_t) (I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_LSB);
	i2s_config_rx.intr_alloc_flags = (ESP_INTR_FLAG_LEVEL1
			| ESP_INTR_FLAG_SHARED);	// Interrupt level 1
	i2s_config_rx.dma_buf_count = 2;		// number of DMA buffers, 128 max.
	i2s_config_rx.dma_buf_len = AUDIO_SAMPLES_PER_DMA; // pretty sure .. this is # of elements, not sizeof
	i2s_config_rx.use_apll = false;	// use APLL as main I2S clock ... less accurate :(
	i2s_config_rx.fixed_mclk = false;				// not using MCLK output
	//mic stuff
	ESP_LOGV(TAG, "Using I2S peripheral");
	i2s_driver_install(I2S_NUM_1, &i2s_config_rx, 0, NULL);
	if (GPIO_IS_VALID_GPIO(I2S_WS)&&GPIO_IS_VALID_GPIO(I2S_CLOCK)
			&& GPIO_IS_VALID_GPIO(I2S_DIN)) {
		ESP_LOGI(TAG, "gpio pins look valid");
		i2s_set_pin(I2S_NUM_1, &pin_config_rx);
		i2s_zero_dma_buffer(I2S_NUM_1);
	} else ESP_LOGE(TAG, "gpio pins aren't valid");
	setupInterrupt();
	return true;
}

bool Ics43434::startRecording() {
	bool rv = true;
	//enable the interrupt and away we go
	esp_err_t err = esp_intr_enable(i2s_interrupt);
	if (err != ESP_OK)
		ESP_LOGE(TAG, "error in esp_intr_enable: %s", esp_err_to_name(err));
	return rv;
}

bool Ics43434::stopRecording() {
	esp_intr_disable(i2s_interrupt);
	return true;
}