#include "Exception.hpp"
#include "Print.hpp"

namespace Slic3r {

// 1-based extruder identifier for this region and role.
unsigned int PrintRegion::extruder(FlowRole role) const
{
    size_t extruder = 0;
    if (role == frPerimeter || role == frExternalPerimeter)
        extruder = m_config.perimeter_extruder;
    else if (role == frInfill)
        extruder = m_config.infill_extruder;
    else if (role == frSolidInfill || role == frTopSolidInfill)
        extruder = m_config.solid_infill_extruder;
    else
        throw Slic3r::InvalidArgument("Unknown role");
    return extruder;
}

Flow PrintRegion::flow(FlowRole role, double layer_height, bool bridge, bool first_layer, double width, const PrintObject &object) const
{
    ConfigOptionFloatOrPercent config_width;
    if (width != -1) {
        // use the supplied custom width, if any
        config_width.value = width;
        config_width.percent = false;
    } else {
        // otherwise, get extrusion width from configuration
        // (might be an absolute value, or a percent value, or zero for auto)
        if (first_layer && m_print->config().first_layer_extrusion_width.value > 0) {
            config_width = m_print->config().first_layer_extrusion_width;
        } else if (role == frExternalPerimeter) {
            config_width = m_config.external_perimeter_extrusion_width;
        } else if (role == frPerimeter) {
            config_width = m_config.perimeter_extrusion_width;
        } else if (role == frInfill) {
            config_width = m_config.infill_extrusion_width;
        } else if (role == frSolidInfill) {
            config_width = m_config.solid_infill_extrusion_width;
        } else if (role == frTopSolidInfill) {
            config_width = m_config.top_infill_extrusion_width;
        } else {
            throw Slic3r::InvalidArgument("Unknown role");
        }
    }

    if (config_width.value == 0)
        config_width = object.config().extrusion_width;
    
    // Get the configured nozzle_diameter for the extruder associated to the flow role requested.
    // Here this->extruder(role) - 1 may underflow to MAX_INT, but then the get_at() will follback to zero'th element, so everything is all right.
    double nozzle_diameter = m_print->config().nozzle_diameter.get_at(this->extruder(role) - 1);
    return Flow::new_from_config_width(role, config_width, (float)nozzle_diameter, (float)layer_height, bridge ? (float)m_config.bridge_flow_ratio : 0.0f);
}

coordf_t PrintRegion::nozzle_dmr_avg(const PrintConfig &print_config) const
{
    return (print_config.nozzle_diameter.get_at(m_config.perimeter_extruder.value    - 1) + 
            print_config.nozzle_diameter.get_at(m_config.infill_extruder.value       - 1) + 
            print_config.nozzle_diameter.get_at(m_config.solid_infill_extruder.value - 1)) / 3.;
}

coordf_t PrintRegion::bridging_height_avg(const PrintConfig &print_config) const
{
    return this->nozzle_dmr_avg(print_config) * sqrt(m_config.bridge_flow_ratio.value);
}

void PrintRegion::collect_object_printing_extruders(const PrintConfig &print_config, const PrintRegionConfig &region_config, std::vector<unsigned int> &object_extruders)
{
    // These checks reflect the same logic used in the GUI for enabling/disabling extruder selection fields.
    auto num_extruders = (int)print_config.nozzle_diameter.size();
    auto emplace_extruder = [num_extruders, &object_extruders](int extruder_id) {
    	int i = std::max(0, extruder_id - 1);
        object_extruders.emplace_back((i >= num_extruders) ? 0 : i);
    };
    if (region_config.perimeters.value > 0 || print_config.brim_width.value > 0)
    	emplace_extruder(region_config.perimeter_extruder);
    if (region_config.fill_density.value > 0)
    	emplace_extruder(region_config.infill_extruder);
    if (region_config.top_solid_layers.value > 0 || region_config.bottom_solid_layers.value > 0)
    	emplace_extruder(region_config.solid_infill_extruder);
}

void PrintRegion::collect_object_printing_extruders(std::vector<unsigned int> &object_extruders) const
{
    // PrintRegion, if used by some PrintObject, shall have all the extruders set to an existing printer extruder.
    // If not, then there must be something wrong with the Print::apply() function.
#ifndef NDEBUG
    auto num_extruders = (int)print()->config().nozzle_diameter.size();
    assert(this->config().perimeter_extruder    <= num_extruders);
    assert(this->config().infill_extruder       <= num_extruders);
    assert(this->config().solid_infill_extruder <= num_extruders);
#endif
    collect_object_printing_extruders(print()->config(), this->config(), object_extruders);
}

}
