package template

import (
	"git.wtrh.nl/patterns/gopatterns/pkg/pattern"
	"git.wtrh.nl/patterns/gopatterns/pkg/pattern/path"
	"git.wtrh.nl/patterns/gopatterns/pkg/pattern/point"
)

// Lines contains one Line or more in a slice.
type Lines []Line

// Line describes a pattern line.
type Line struct {
	Through []point.ID `yaml:"through"`
	Curve   *Curve     `yaml:"curve,omitempty"`
	Style   *Style     `yaml:"style,omitempty"`
}

type Style struct {
	Thickness *float64 `yaml:"thickness,omitempty"`
}

// Curve describes if a Line curves and if it has start and end constraints.
type Curve struct {
	Start point.ID `yaml:"start,omitempty"`
	End   point.ID `yaml:"end,omitempty"`
}

// Build adds the line to the provided [pattern.Pattern].
func (l Line) Build(pat *pattern.Pattern) error {
	points := pat.GetPoints(l.Through...)
	for _, p := range points {
		p.SetDraw()
	}

	switch {
	case l.Curve != nil:
		startPoint := pat.GetPoint(l.Curve.Start)
		endPoint := pat.GetPoint(l.Curve.End)
		spline := path.NewSpline(startPoint, endPoint, points...)

		if l.Style != nil && l.Style.Thickness != nil {
			spline.SetThickness(*l.Style.Thickness)
		}

		pat.AddLine(spline)
	default:
		newPath := path.NewPath(points...)
		if l.Style != nil && l.Style.Thickness != nil {
			newPath.SetThickness(*l.Style.Thickness)
		}

		pat.AddLine(newPath)
	}

	return nil
}

// Build adds all the lines to the provided [pattern.Pattern].
func (l Lines) Build(pat *pattern.Pattern) error {
	for _, line := range l {
		err := line.Build(pat)
		if err != nil {
			return err
		}
	}

	return nil
}