// SPDX-FileCopyrightText: 2024 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only

#include <cmath>

#include "ROICircle.h"
#include "JFJochException.h"

ROICircle::ROICircle(const std::string &name, float in_x, float in_y, float in_r_pxl)
        : ROIElement(name), center_x(in_x), center_y(in_y), r_pxl(in_r_pxl), r_pxl_2(in_r_pxl * in_r_pxl) {
    // isfinite, not just > 0: NaN passes every <= test, inf passes > 0, and both then reach the
    // preview drawing, where a non-finite bound becomes an endless loop.
    if (!std::isfinite(r_pxl) || r_pxl <= 0.0)
        throw JFJochException(JFJochExceptionCategory::InputParameterInvalid,
                              "ROICircle: radius must be a positive finite number");
    if (!std::isfinite(center_x) || !std::isfinite(center_y))
        throw JFJochException(JFJochExceptionCategory::InputParameterInvalid,
                              "ROICircle: center must be finite");
}

float ROICircle::GetX() const {
    return center_x;
}

float ROICircle::GetY() const {
    return center_y;
}

float ROICircle::GetRadius_pxl() const {
    return r_pxl;
}

ROIConfig ROICircle::ExportMetadata() const {
    return ROIConfig{
            .type = ROIConfig::ROIType::Circle,
            .name = name,
            .circle = ROIConfigCircle{.r = r_pxl, .x = center_x, .y = center_y}
    };
}

bool ROICircle::CheckROI(int64_t x, int64_t y, float resolution, float phi_deg) const {
    float x_fl = static_cast<float>(x) - center_x;
    float y_fl = static_cast<float>(y) - center_y;
    float dist_from_center_sq = x_fl * x_fl + y_fl * y_fl;
    return (dist_from_center_sq <= r_pxl_2);
}