module tk.geometry2;

private import std.stdio;
private import std.math;

struct Point2 {
    this(in double x, in double y) {
        _x = x;
        _y = y;
    }

    Point2 opAdd(in Vector2 v) const {
        return Point2(_x + v._x, _y + v._y);
    }

    Point2 opSub(in Vector2 v) const {
        return Point2(_x - v._x, _y - v._y);
    }

    Vector2 opSub(in Point2 p) const {
        return Vector2(_x - p._x, _y - p._y);
    }

    string toString() /* const */ {
        return std.string.format("(%f, %f)", _x, _y);
    }

    double x() const { return _x; }
    double y() const { return _y; }

    private {
        double _x, _y;
    }
}

struct Vector2 {
    this(in double x, in double y) {
        _x = x;
        _y = y;
    }

    Vector2 opAdd(in Vector2 v) const {
        return Vector2(_x + v._x, _y + v._y);
    }

    Vector2 opSub(in Vector2 v) const {
        return Vector2(_x - v._x, _y - v._y);
    }

    Vector2 opNeg() const {
        return Vector2(-_x, -_y);
    }

    Vector2 opMul_r(double d) const {
        return Vector2(d * _x, d * _y);
    }

    Vector2 opDiv(double d) const {
        return Vector2(_x / d, _y / d);
    }

    double length() const {
        return sqrt(_x * _x + _y * _y);
    }

    string toString() /* const */ {
        return std.string.format("[%f, %f]", _x, _y);
    }

    double x() const { return _x; }
    double y() const { return _y; }

    private {
        double _x, _y;
    }
}

struct Rectangle2 {
    this(in Point2 position, Vector2 size) {
        this(position.x, position.y, size.x, size.y);
    }

    this(Point2 corner1, Point2 corner2) {
        this(corner1.x, corner1.y, corner2.x - corner1.x, corner2.y - corner1.y);
    }

    // Intersection
    Rectangle2 opAnd(in Rectangle2 r) const {
        // FIXME
        return Rectangle2(3.2, 5.3, 3.2, 2.3);
    }

    // Union
    Rectangle2 opOr(in Rectangle2 r) const {
        // FIXME
        return Rectangle2(3.2, 5.3, 5.8, 2.1);
    }

    string toString() {
        return std.string.format("{%s, %s}", mPosition, mSize);
    }

    private {
        this(double x, double y, double w, double h) {
            if (w < 0.0) { x += w; w = -w; }
            if (h < 0.0) { y += h; h = -h; }
            mPosition = Point2(x, y);
            mSize = Vector2(w, h);
        }

        Point2 mPosition;
        Vector2 mSize;
    }
}