#include "board_controls.hpp"

#include <driver/gpio.h>
#include <esp_log.h>
#include <esp_timer.h>

namespace microbu {
namespace {
const char* TAG = "board";
constexpr std::int64_t blink_us = CONFIG_MICROBU_TX_LED_BLINK_MS * 1000LL;
}

BoardControls::BoardControls() {
#if CONFIG_MICROBU_TX_LED_GPIO < 0
    ESP_LOGI(TAG, "no activity LED configured");
#else
    gpio_config_t led = {};
    led.pin_bit_mask = 1ULL << CONFIG_MICROBU_TX_LED_GPIO;
    led.mode = GPIO_MODE_OUTPUT;
    led.pull_up_en = GPIO_PULLUP_DISABLE;
    led.pull_down_en = GPIO_PULLDOWN_DISABLE;
    led.intr_type = GPIO_INTR_DISABLE;
    ESP_ERROR_CHECK(gpio_config(&led));
#if CONFIG_MICROBU_LED_INVERTED_RX
    mode_ = LedMode::inverted_rx;
#else
    mode_ = LedMode::normal_tx;
#endif
    apply_led_state();
    ESP_LOGI(TAG, "LED GPIO %d (mode: %s)", CONFIG_MICROBU_TX_LED_GPIO,
             mode_ == LedMode::inverted_rx ? "inverted_rx (normally ON)" : "normal_tx (normally OFF)");
#endif
}

void BoardControls::apply_led_state() {
#if CONFIG_MICROBU_TX_LED_GPIO >= 0
    // The XIAO ESP32-C5 user LED is wired active-low (0 = ON, 1 = OFF).
    // In normal_tx mode: default OFF (1), pulsing ON (0).
    // In inverted_rx mode: default ON (0), pulsing OFF (1).
    bool led_illuminated = false;
    if (mode_ == LedMode::normal_tx) {
        led_illuminated = pulsing_;
    } else {
        led_illuminated = !pulsing_;
    }
    gpio_set_level(static_cast<gpio_num_t>(CONFIG_MICROBU_TX_LED_GPIO), led_illuminated ? 0 : 1);
#endif
}

void BoardControls::blink() {
    pulse_until_us_ = esp_timer_get_time() + blink_us;
    if (!pulsing_) {
        pulsing_ = true;
        apply_led_state();
    }
}

void BoardControls::tick() {
    if (pulsing_ && esp_timer_get_time() >= pulse_until_us_) {
        pulsing_ = false;
        apply_led_state();
    }
}

} // namespace microbu