#include "auto_ctrl_thresholds.h"

#include "freertos/FreeRTOS.h"
#include "esp_check.h"

// 默认土壤湿度低于此百分比时启动水泵（单位：%）
#define DEFAULT_PUMP_ON_SOIL_BELOW_PCT 35.0f
// 默认土壤湿度高于此百分比时关闭水泵（单位：%）
#define DEFAULT_PUMP_OFF_SOIL_ABOVE_PCT 45.0f
// 默认光照强度低于此值时开启补光灯（单位：lux）
#define DEFAULT_LIGHT_ON_LUX_BELOW 200.0f
// 默认光照强度高于此值时关闭补光灯（单位：lux）
#define DEFAULT_LIGHT_OFF_LUX_ABOVE 350.0f

// 用于保护阈值数据的自旋锁（临界区）
static portMUX_TYPE s_thresholds_lock = portMUX_INITIALIZER_UNLOCKED;

// 全局阈值配置结构体，初始化为默认值
static auto_ctrl_thresholds_t s_thresholds = {
    .pump_on_soil_below_pct = DEFAULT_PUMP_ON_SOIL_BELOW_PCT,
    .pump_off_soil_above_pct = DEFAULT_PUMP_OFF_SOIL_ABOVE_PCT,
    .light_on_lux_below = DEFAULT_LIGHT_ON_LUX_BELOW,
    .light_off_lux_above = DEFAULT_LIGHT_OFF_LUX_ABOVE,
};

/**
 * @brief 验证自动控制阈值配置的有效性
 *
 * 检查指针非空、数值范围合法、启停阈值满足 on < off 等条件。
 *
 * @param cfg 待验证的阈值配置指针
 * @return esp_err_t 验证结果，ESP_OK 表示有效
 */
static esp_err_t auto_ctrl_thresholds_validate(const auto_ctrl_thresholds_t *cfg)
{
    ESP_RETURN_ON_FALSE(cfg != NULL, ESP_ERR_INVALID_ARG, "auto_ctrl_thresholds", "cfg is null");

    ESP_RETURN_ON_FALSE(cfg->pump_on_soil_below_pct >= 0.0f && cfg->pump_on_soil_below_pct <= 100.0f,
                        ESP_ERR_INVALID_ARG,
                        "auto_ctrl_thresholds",
                        "pump_on_soil_below_pct out of range");
    ESP_RETURN_ON_FALSE(cfg->pump_off_soil_above_pct >= 0.0f && cfg->pump_off_soil_above_pct <= 100.0f,
                        ESP_ERR_INVALID_ARG,
                        "auto_ctrl_thresholds",
                        "pump_off_soil_above_pct out of range");
    ESP_RETURN_ON_FALSE(cfg->pump_on_soil_below_pct < cfg->pump_off_soil_above_pct,
                        ESP_ERR_INVALID_ARG,
                        "auto_ctrl_thresholds",
                        "pump thresholds must satisfy on < off");

    ESP_RETURN_ON_FALSE(cfg->light_on_lux_below >= 0.0f,
                        ESP_ERR_INVALID_ARG,
                        "auto_ctrl_thresholds",
                        "light_on_lux_below out of range");
    ESP_RETURN_ON_FALSE(cfg->light_off_lux_above >= 0.0f,
                        ESP_ERR_INVALID_ARG,
                        "auto_ctrl_thresholds",
                        "light_off_lux_above out of range");
    ESP_RETURN_ON_FALSE(cfg->light_on_lux_below < cfg->light_off_lux_above,
                        ESP_ERR_INVALID_ARG,
                        "auto_ctrl_thresholds",
                        "light thresholds must satisfy on < off");

    return ESP_OK;
}

/**
 * @brief 初始化阈值为默认值
 *
 * 将全局阈值结构体重置为预设的默认配置。
 */
void auto_ctrl_thresholds_init_defaults(void)
{
    const auto_ctrl_thresholds_t defaults = {
        .pump_on_soil_below_pct = DEFAULT_PUMP_ON_SOIL_BELOW_PCT,
        .pump_off_soil_above_pct = DEFAULT_PUMP_OFF_SOIL_ABOVE_PCT,
        .light_on_lux_below = DEFAULT_LIGHT_ON_LUX_BELOW,
        .light_off_lux_above = DEFAULT_LIGHT_OFF_LUX_ABOVE,
    };

    taskENTER_CRITICAL(&s_thresholds_lock);
    s_thresholds = defaults;
    taskEXIT_CRITICAL(&s_thresholds_lock);
}

/**
 * @brief 获取当前阈值配置
 *
 * 安全地复制当前阈值到输出参数中。
 *
 * @param out 输出参数，指向接收阈值的结构体
 */
void auto_ctrl_thresholds_get(auto_ctrl_thresholds_t *out)
{
    if (out == NULL) {
        return;
    }

    taskENTER_CRITICAL(&s_thresholds_lock);
    *out = s_thresholds;
    taskEXIT_CRITICAL(&s_thresholds_lock);
}

/**
 * @brief 设置新的阈值配置
 *
 * 验证输入配置有效性后，安全更新全局阈值。
 *
 * @param cfg 新的阈值配置指针
 * @return esp_err_t 设置结果，ESP_OK 表示成功
 */
esp_err_t auto_ctrl_thresholds_set(const auto_ctrl_thresholds_t *cfg)
{
    ESP_RETURN_ON_ERROR(auto_ctrl_thresholds_validate(cfg), "auto_ctrl_thresholds", "invalid thresholds");

    taskENTER_CRITICAL(&s_thresholds_lock);
    s_thresholds = *cfg;
    taskEXIT_CRITICAL(&s_thresholds_lock);
    return ESP_OK;
}

/**
 * @brief 通过独立参数设置阈值
 *
 * 提供一种更便捷的阈值设置方式，内部封装为结构体后调用 set 接口。
 *
 * @param pump_on_soil_below_pct 水泵启动土壤湿度阈值（%）
 * @param pump_off_soil_above_pct 水泵关闭土壤湿度阈值（%）
 * @param light_on_lux_below 补光灯开启光照阈值（lux）
 * @param light_off_lux_above 补光灯关闭光照阈值（lux）
 * @return esp_err_t 设置结果
 */
esp_err_t auto_ctrl_thresholds_set_values(float pump_on_soil_below_pct,
                                          float pump_off_soil_above_pct,
                                          float light_on_lux_below,
                                          float light_off_lux_above)
{
    const auto_ctrl_thresholds_t cfg = {
        .pump_on_soil_below_pct = pump_on_soil_below_pct,
        .pump_off_soil_above_pct = pump_off_soil_above_pct,
        .light_on_lux_below = light_on_lux_below,
        .light_off_lux_above = light_off_lux_above,
    };

    return auto_ctrl_thresholds_set(&cfg);
}