package main

import (
	"fmt"
	"github.com/tutumagi/gecs"
)
// pre define your component data type
type Name string
type Age int
type Position struct {
	X int
	Y int
	Z int
}

func main() {
	// create a registry
	registry := gecs.NewRegistry()

	// register all components what you will use later
	// It's to identify component type
	NameID := registry.RegisterComponent("name")
	AgeID := registry.RegisterComponent("age")
	PositionID := registry.RegisterComponent("position")

	// create an entity
	entity := registry.Create()

	// assign component data
	registry.Assign(entity, NameID, Name("tufei"))
	registry.Assign(entity, AgeID, Age(12))

	// check whether an entity has given components data or not
	fmt.Printf("entity %v has <Name>: %v\n", entity, registry.Has(entity, NameID))              // true
	fmt.Printf("entity %v has <Name & Age>: %v\n", entity, registry.Has(entity, NameID, AgeID)) // true
	fmt.Printf("entity %v has <Position>: %v\n", entity, registry.Has(entity, PositionID))      // false

	// iterator entities by givin component
	registry.View(NameID, AgeID).Each(func(entity gecs.EntityID, datas map[gecs.ComponentID]interface{}) {
		name := datas[NameID].(Name) // the component type bind componentID must be consistent with you assign before
		age := datas[AgeID].(Age)

		fmt.Printf("name is %v\n", name)
		fmt.Printf("age is %v\n", age)
	})
}