//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      Sample/Multilayer/Layer.cpp
//! @brief     Implements class Layer.
//!
//! @homepage  http://www.bornagainproject.org
//! @license   GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
//  ************************************************************************************************

#include "Sample/Multilayer/Layer.h"
#include "Base/Util/StringUtil.h"
#include "Sample/Aggregate/ParticleLayout.h"

//! Constructor of a layer with thickness and material
//! @param material: material the layer is made of
//! @param thickness: thickness of a layer in nanometers
Layer::Layer(Material material, double thickness)
    : m_material(std::move(material))
    , m_thickness(thickness)
{
    if (thickness < 0.)
        throw std::runtime_error("Layer contructor called with negative thickness");
}

Layer::~Layer() = default;

Layer* Layer::clone() const
{
    auto* result = new Layer(m_material, m_thickness);
    result->m_B_field = m_B_field;
    result->m_n_slices = m_n_slices;
    for (const auto* layout : layouts())
        result->addLayout(*layout);
    return result;
}

std::vector<const INode*> Layer::nodeChildren() const
{
    std::vector<const INode*> result;
    for (const auto* layout : m_layouts)
        result.push_back(layout);
    return result;
}

void Layer::addLayout(const ParticleLayout& layout)
{
    m_layouts.emplace_back(layout.clone());
}

std::vector<const ParticleLayout*> Layer::layouts() const
{
    std::vector<const ParticleLayout*> result;
    for (const auto* layout : m_layouts)
        result.push_back(layout);
    return result;
}

std::string Layer::validate() const
{
    std::vector<std::string> errs;
    for (size_t i = 0; i < m_layouts.size(); ++i) {
        std::string err = m_layouts[i]->validate();
        if (!err.empty())
            errs.push_back("{ layout " + std::to_string(i) + ": " + err + " }");
    }

    if (!errs.empty())
        return "[ " + Base::String::join(errs, ", ") + " ]";
    return "";
}
