ZeroFrame.coffee

class ZeroFrame
    constructor: (url) ->
        @url = url
        @waiting_cb = {}
        @wrapper_nonce = document.location.href.replace(/.*wrapper_nonce=([A-Za-z0-9]+).*/, "$1")
        @connect()
        @next_message_id = 1
        @init()


    init: ->
        @


    connect: ->
        @target = window.parent
        window.addEventListener("message", @onMessage, false)
        @cmd("innerReady")


    onMessage: (e) =>
        message = e.data
        cmd = message.cmd
        if cmd == "response"
            if @waiting_cb[message.to]?
                @waiting_cb[message.to](message.result)
            else
                @log "Websocket callback not found:", message
        else if cmd == "wrapperReady" # Wrapper inited later
            @cmd("innerReady")
        else if cmd == "ping"
            @response message.id, "pong"
        else if cmd == "wrapperOpenedWebsocket"
            @onOpenWebsocket()
        else if cmd == "wrapperClosedWebsocket"
            @onCloseWebsocket()
        else
            @route cmd, message


    route: (cmd, message) =>
        @log "Unknown command", message


    response: (to, result) ->
        @send {"cmd": "response", "to": to, "result": result}


    cmd: (cmd, params={}, cb=null) ->
        @send {"cmd": cmd, "params": params}, cb


    send: (message, cb=null) ->
        message.wrapper_nonce = @wrapper_nonce
        message.id = @next_message_id
        @next_message_id += 1
        @target.postMessage(message, "*")
        if cb
            @waiting_cb[message.id] = cb


    log: (args...) ->
        console.log "[ZeroFrame]", args...


    onOpenWebsocket: =>
        @log "Websocket open"


    onCloseWebsocket: =>
        @log "Websocket close"



window.ZeroFrame = ZeroFrame