package room

import (
	"github.com/rs/xid"
	"go.uber.org/zap"
	"hexmap-server/state"
)

// NewOptions is the set of information used to control what a room starts with.
type NewOptions struct {
	// BaseLogger is the logger that the room should attach its data to.
	BaseLogger *zap.Logger
	// StartingState is a state.Synced that defines the state of the room on creation.
	StartingState *state.Synced
	// StartingClientOptions sets the configuration of the first client to be created, the one that will be returned
	// from New.
	StartingClientOptions NewClientOptions
}

// room is a room as seen from within - the information needed for the room process to do its duties.
type room struct {
	// id is the room's internal ID - not to be confused with the ID of the map it is serving.
	id xid.ID
	// incomingChannel is the channel the room uses to receive messages. The room itself owns this channel,
	// so when the clients map is empty, it can be closed.
	incomingChannel chan ClientMessage
	// clients contains the map of active clients, each of which is known to have a reference to this room.
	clients map[xid.ID]internalClient
	// currentState contains the active state being used by actions right now.
	currentState state.Synced
	// logger is the logger that this room will use. It contains context fields for the room's important fields.
	logger *zap.Logger
}

// New creates and starts up a new room, joins a new client to it and returns that client.
func New(opts NewOptions) *Client {
	logger := opts.BaseLogger.Named("Room")
	id := xid.New()
	r := room{
		id:              id,
		incomingChannel: make(chan ClientMessage),
		clients:         make(map[xid.ID]internalClient),
		currentState:    *opts.StartingState,
		logger:          logger,
	}
	go r.act()
	return r.newClient(opts.StartingClientOptions)
}

// newClient creates a new client belonging to this room with a random ID.
// The new client will be automatically joined to the channel.
func (r *room) newClient(opts NewClientOptions) *Client {
	return newClientForRoom(r.id, r.incomingChannel, opts)
}