#include "Fill_Area.h"
#include <utility>
#include "../Axis/Abs_Axis_p.h"
#include "../base/Frame_Memory.h"
#include "../base/Memory.h"
#include "../render/Canvas.h"
namespace renderive {
struct Fill_Area_Input_Data : Latest_Input_Data {
    std::pmr::vector<PointF> points{memory_resource(Memory_Domain::Curve)};
    void push(std::span<const PointF> values) {
        points.assign(values.begin(), values.end());
        mark_latest_pushed();
    }
    void push(std::pmr::vector<PointF>&& values) {
        points = std::move(values);
        mark_latest_pushed();
    }
    template <typename Handler>
    void read_all(Handler handler) {
        if (pending)
            handler(points);
    }
    void clear() override {
        points.clear();
        clear_latest();
    }
};
struct Fill_Area_Render_State : Render_State, Fill_Area_Prop {};
struct Fill_Area_Private : Typed_Render_Data<Fill_Area, Fill_Area_Render_State, Fill_Area_Input_Data> {
    std::pmr::vector<PointF> data_points{memory_resource(Memory_Domain::Curve)};
    void prepare_data(const Render_Frame_Snapshot&, const Renderable_Frame_View& frame_view) override {
        Fill_Area_Input_Data* input = render_input_data(frame_view);
        if (!input)
            return;
        input->read_all([this](std::pmr::vector<PointF>& points) {
            data_points.swap(points);
        });
        frame_view.consume_input();
    }
    void draw(Canvas& canvas, const Render_Frame_Snapshot& snapshot, const Renderable_Frame_View& frame_view) override {
        Fill_Area_Render_State* s = render_state(frame_view);
        if (!s)
            return;
        auto domain_axis = s->domain_axis.lock();
        auto value_axis = s->value_axis.lock();
        if (!domain_axis || !value_axis || data_points.empty())
            return;
        Axis_Mapping_2D mapping = Axis_Render_Access::mapping(domain_axis.get(), value_axis.get(), snapshot);
        std::pmr::vector<PointF> polygon(frame_memory_resource());
        if (s->mode == Fill_Area_Mode::To_Baseline) {
            polygon.resize(data_points.size() + 2);
            polygon.front() = mapping.map(data_points.front().x, s->baseline);
            polygon.back() = mapping.map(data_points.back().x, s->baseline);
            for (int i = 0; i < data_points.size(); ++i) {
                const PointF& point = data_points.at(i);
                polygon[i + 1] = mapping.map(point);
            }
        }
        else {
            polygon.resize(data_points.size());
            for (int i = 0; i < data_points.size(); ++i) {
                const PointF& point = data_points.at(i);
                polygon[i] = mapping.map(point);
            }
        }
        canvas.save();
        canvas.set_antialias(s->antialias);
        canvas.set_pen(s->pen);
        canvas.set_brush(s->brush);
        canvas.draw_polygon(std::span<const PointF>(polygon.data(), polygon.size()), false);
        canvas.restore();
    }
};
RENDERIVE_DEFINE_RENDERABLE_BINDING(Fill_Area, Fill_Area_Private, Fill_Area_Render_State, Fill_Area_Input_Data, "FillArea")
void Fill_Area::update_points(std::span<const PointF> points) {
    if (!ok())
        return;
    Render_Input_Lease<Fill_Area_Private, Fill_Area_Input_Data> input(d());
    input->push(points);
}
void Fill_Area::update_points(std::pmr::vector<PointF>&& points) {
    if (!ok())
        return;
    Render_Input_Lease<Fill_Area_Private, Fill_Area_Input_Data> input(d());
    input->push(std::move(points));
}
RENDERIVE_DEFINE_WEAK_STATE_PROP(Fill_Area, Fill_Area_Render_State, Abs_Axis, domain_axis)
RENDERIVE_DEFINE_WEAK_STATE_PROP(Fill_Area, Fill_Area_Render_State, Abs_Axis, value_axis)
RENDERIVE_DEFINE_STATE_PROP(Fill_Area, Fill_Area_Render_State, double, baseline)
RENDERIVE_DEFINE_STATE_PROP(Fill_Area, Fill_Area_Render_State, Brush, brush)
RENDERIVE_DEFINE_STATE_PROP(Fill_Area, Fill_Area_Render_State, Pen, pen)
RENDERIVE_DEFINE_STATE_PROP(Fill_Area, Fill_Area_Render_State, bool, antialias)
RENDERIVE_DEFINE_STATE_PROP(Fill_Area, Fill_Area_Render_State, Fill_Area_Mode, mode)
Fill_Area::Builder::Builder(std::shared_ptr<Renderable> parent, std::shared_ptr<Abs_Axis> domain_axis, std::shared_ptr<Abs_Axis> value_axis) {
    ASSERT(parent, "Fill_Area build error! parent == nullptr");
    ASSERT(domain_axis && value_axis, "Fill_Area build error! axis == nullptr");
    ASSERT(domain_axis->attached_to_plot(), "Fill_Area build error! domain_axis->plot == nullptr");
    ASSERT(domain_axis->shares_plot_with(*value_axis), "Fill_Area build error! domain_axis->plot != value_axis->plot");
    ASSERT(parent->shares_plot_with(*domain_axis), "Fill_Area build error! parent->plot != axis->plot");
    ASSERT(domain_axis->orientation() != value_axis->orientation(), "Fill_Area build error! axes must be orthogonal");
    this->parent = parent;
    this->domain_axis = domain_axis;
    this->value_axis = value_axis;
}
std::shared_ptr<Fill_Area> Fill_Area::Builder::build() {
    auto ret = renderive::make_shared<Fill_Area>();
    ret->init(parent);
    Fill_Area_Private* pd = ret->d();
    Render_Edit_Lease<Fill_Area_Private, Fill_Area_Render_State> edit(pd);
    Fill_Area_Render_State* sc = edit.operator->();
    PROP_R(std::weak_ptr<Abs_Axis>, domain_axis)
    PROP_R(std::weak_ptr<Abs_Axis>, value_axis)
    PROP_R(double, baseline)
    PROP_R(Brush, brush)
    PROP_R(Pen, pen)
    PROP_R(bool, antialias)
    PROP_R(Fill_Area_Mode, mode)
    return ret;
}
} // namespace renderive