package main

import (
	"fmt"
	"strings"
)

type Engine struct {
	node  *Node  // Ref
	Kind  string // engine, reverse engine, steering
	Sides string // L = Left, R = Right
	Pos   Vec2
	Zoom  float64
	Angle float64
	Over  bool // false=under, true=over
}

func (e *Engine) Parse(node *Node) error {
	if !strings.Contains(node.Key(), "engine") {
		return fmt.Errorf("not a engine")
	}
	e.node = node
	if strings.Contains(node.Key(), "reverse") {
		e.Kind = "reverse engine"
	} else if strings.Contains(node.Key(), "steering") {
		e.Kind = "steering engine"
	} else {
		e.Kind = "engine"
	}
	e.Pos.Parse(node.Line)
	if node.Len() == 0 {
		return nil
	}
	for _, kid := range node.Children {
		switch kid.Key() {
		case "zoom":
			e.Zoom = kid.ValueFloat64()
		case "angle":
			e.Angle = kid.ValueFloat64()
		case "over":
			e.Over = true
		case "left":
			if !strings.Contains(e.Sides, "L") {
				e.Sides += "L"
			}
		case "right":
			if !strings.Contains(e.Sides, "R") {
				e.Sides += "R"
			}
		}
	}
	return nil
}