package main

import "fmt"

// Identification Number
//
// Used to separate things into a unique thing
type Id uint64

// An Id is considered valid so long as it's not 0
func (i Id) valid() bool {
	return i != 0
}

// Render of an Id is simply prefixing it with #
//
// i.e. Id=5  .render()  "#5"
func (i Id) render() string {
	return fmt.Sprintf("#%d", i)
}

// Kind is used to separate a general Object into specific categories
//
// Players, Guilds, Rooms, Items, Creatures, Vehicles
//
// e.g. Players, Items, Creatures and Vehicles have a "health" (Items and Vehicles use the same name for their durability)
//
// But a Room won't use "health" (Despite it existing)
type Kind uint8

// A Kind is valid so long as it's not 0 or None
func (k Kind) valid() bool {
	return k != KNone
}

// Renders the Kind as a name
//
// i.e. Kind=Guild (2)  .render()  "Guild"
func (k Kind) render() string {
	switch k {
	case KPlayer:
		return "Player"
	case KGuild:
		return "Guild"
	case KRoom:
		return "Room"
	case KItem:
		return "Item"
	case KCreature:
		return "Creature"
	case KVehicle:
		return "Vehicle"
	default:
		return "Unknown"
	}
}

const (
	// An Invalid Kind
	KNone Kind = iota
	// A Creature, but controlled by a Human
	KPlayer
	// A Collection of 1 or more Players (Inventory is shared among Players, etc.)
	KGuild
	// A Room, which can hold Players, Items, Creatures, Vehicles and Containers
	KRoom
	// A Item, This is broad, but most Items should specify a specific thing (Weapon's for instance would have a "damage", Armor "defense", Gold on the other hand might have "value")
	KItem
	// A Entity that is controlled by either a Human's Logic (Scripted in some manner), or by the computer (Scripted internally)
	KCreature
	// A Entity / Room Hybrid, it behaves like both a Room and a Creature, Players and Creatures can enter a Vehicle, then where ever the Vehicle goes they are moved along with it
	KVehicle
)

// A ValueRange is something which has a current Value and a Max
//
// Some ValueRanges are Health, Magic, and Build Points
type ValueRange struct {
	Value uint64
	Max   uint64
}

// ValueRanges are invalid when Max is 0, or Value is greater than Max
func (v ValueRange) valid() bool {
	if v.Max == 0 {
		return false
	}
	return v.Value <= v.Max
}

// A 0 to 100 of the percentage the Range is at based on Value and Max
//
// This method will return 0 if the ValueRange is invalid
func (v *ValueRange) Percent() uint8 {
	if IsInvalid(v) {
		return 0
	}
	return uint8((float32(v.Value) / float32(v.Max)) * 100.0)
}

// Forms a good default for a ValueRange
//
// i.e. ValueRange{Value: 5, Max: 10}  .render()  "5/10"
func (v ValueRange) render() string {
	if IsInvalid(v) {
		return ""
	}
	return fmt.Sprintf("%d/%d", v.Value, v.Max)
}