/*
 * Copyright (c) 2021 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */

#include "api/light_ctrl_reg.h"

void bt_mesh_light_ctrl_reg_target_set(struct bt_mesh_light_ctrl_reg *reg,
                                       float value,
                                       int32_t transition_time)
{
    reg->prev_target = reg->target;
    reg->target = value;
    if (reg->target == reg->prev_target) {
        reg->transition_time = 0;
        return;
    }
    reg->transition_start = k_uptime_get();
    reg->transition_time = transition_time;
}

float bt_mesh_light_ctrl_reg_target_get(struct bt_mesh_light_ctrl_reg *reg)
{
    if (reg->transition_time == 0) {
        return reg->target;
    }

    int32_t elapsed = k_uptime_get() - reg->transition_start;

    if (elapsed >= reg->transition_time) {
        reg->transition_time = 0;
        return reg->target;
    }
    return reg->prev_target +
           (elapsed * (reg->target - reg->prev_target)) / reg->transition_time;
}