package xgeo

import (
	"errors"
	"github.com/golang/geo/r2"
	"github.com/spatial-go/geoos/space"
)

type Polygon struct {
	r2.Rect
}

func NewPolygon(coords [][]float64) Polygon {
	rect := r2.EmptyRect()
	if len(coords) > 0 {
		points := make([]r2.Point, 0)
		for _, v := range coords {
			point := r2.Point{
				X: v[0],
				Y: v[1],
			}
			points = append(points, point)
		}

		rect = r2.RectFromPoints(points...)
	}
	return Polygon{rect}
}

func (p Polygon) Area() (float64, error) {
	size := p.Size()
	if size.X == size.Y && size.X < 0 {
		return 0, errors.New("polygon area err")
	}

	return size.X * size.Y, nil
}

func (p Polygon) Centroid() space.Point {
	point := p.Center()
	return space.Point([]float64{point.X, point.Y})
}

func (p Polygon) IsEmpty() bool {
	return p.Rect.IsEmpty()
}

func (p Polygon) Intersection(other Polygon) Polygon {
	rect := p.Rect.Intersection(other.Rect)
	return Polygon{rect}
}

func (p Polygon) Contains(other Polygon) bool {
	return p.Rect.Contains(other.Rect)
}

func (p Polygon) InteriorContains(other Polygon) bool {
	return p.Rect.InteriorContains(other.Rect)
}

func (p Polygon) Intersects(other Polygon) bool {
	return p.Rect.Intersects(other.Rect)
}

func (p Polygon) InteriorIntersects(other Polygon) bool {
	return p.Rect.InteriorIntersects(other.Rect)
}

func (p Polygon) ApproxEqual(other Polygon) bool {
	return p.Rect.ApproxEqual(other.Rect)
}

func (p Polygon) Union(other Polygon) Polygon {
	rect := p.Rect.Union(other.Rect)
	return Polygon{rect}
}