package client

import "hackerbots.us/server"

// Player is the interface that defines a player's behavior.
//
// The general case will be to implement a Player type that contains the magic
// required to slay other robots quickly while staying alive for a long time.
type Player interface {

	// GetStats returns a map with an entry for each robot the player will control
	// containing the desired stats for that robot
	GetStats() map[string]server.StatsRequest

	// SetIDs is called from the client once the server
	// has accepted the robots supplied in GetStats and validated
	// their config, the data passed into SetIDs is a mapping of
	// bot name to server side bot ID that is used in all bot
	// dats sent from the server
	SetIDs(map[string]string)

	// Update is called on reciept of a board state packet and the response is
	// the instructions for each robot in a map of robot id to instructions
	Update(bs *server.Boardstate) map[string]server.Instruction
}

// MultiPlayer wraps multiple players and calls funcitons in Player in
// appropriate order.
//
// Typically used to add a Spectator to a bot.
type MultiPlayer []Player

// GetStats implements GetStats for a collection of players asking each player
// for their stats, and returning the configuration of the first player.
func (mp MultiPlayer) GetStats() map[string]server.StatsRequest {
	var s map[string]server.StatsRequest
	for i := len(mp) - 1; i >= 0; i-- {
		s = mp[i].GetStats()
	}
	return s
}

// SetIDs passes ids to all players.
func (mp MultiPlayer) SetIDs(ids map[string]string) {
	for _, p := range mp {
		p.SetIDs(ids)
	}
}

// Update implements Update for a collection of players sending board state to
// each player, and returning the instructions associated with the first
// player.
func (mp MultiPlayer) Update(bs *server.Boardstate) map[string]server.Instruction {
	var inst map[string]server.Instruction
	for i := len(mp) - 1; i >= 0; i-- {
		inst = mp[i].Update(bs)
	}
	return inst
}