'use strict';

function Handler(name)
{
    this.name  = name;
    this.handler_function_list = [];
}
/* 
    add a handler_function 
    to the internal handler_function_list.

    A handler_function tries every time it is invoked,
    to get a certain subsystem into a certain *fixed* state.
    When it succeeded, it return an empty string "".
    if it not (yet) acomplished its goal it will return:
        * The name of the state it waits for.
        * undefined, when it does not know, what state to wait for.

    It is important to feed it back, the wait_state_name it returned
    last time, so it knows, it should not do any action, while waiting
    for a certain state.
*/
Handler.prototype.add = function(func)
{
    this.handler_function_list.push(func);
}

/* run each handler_function in the handler_function_list
   until either all of them return the empty string ""
   or the timeout occured.

*/
Handler.prototype.run = function(timeout)
{
    console.out(this.name+":start");

    var rc = [];

    var start_date = new Date();
    while (!timeout || (new Date()-start_date)<timeout)
    {
        var done = true;
        for (var i=0; i<this.handler_function_list.length; i++)
        {
            var current_handler_function = this.handler_function_list[i];
            if (!current_handler_function.call())
                done = false;
        }

        if (done)
        {
            console.out(this.name+":success [time="+(new Date()-start_date)+"ms]");
            return true;
        }

        v8.sleep();
    }

    console.out(this.name+":timeout ["+timeout+"ms]");
    return false;
}


// ------------------------------------------------------------------------------


function print_object(obj){
    for (var x in obj){
        if (typeof obj[x] != 'function')
            console.log(x+':'+obj[x]);
        else
            console.log(x+': function');
    }
}

function Set(list){
    for (var i=0; i<list.length; i++){
        this[list[i]] = true;
    }
}

function Handler_Function(server_name){
    this.name = server_name;
    this.definition = {
        final_states: new Set([]),
        just_wait_states: new Set([]),
        reset_wait_states: new Set([]),
        action_states: {}, 
    };
    this.wait_state = undefined;
    this.done = false;

    this.current_state = undefined;
    this.last_state = undefined;
}

Handler_Function.prototype.call = function(){
    this.last_state = state;
    var state = dim.state(this.server_name);
    this.current_state = state;

    if (state === undefined){
        // if the current state is undefined, we cannot be done!
        this.wait_state=undefined;
        this.done = false;
        return false;
    }
    else if(this.done){
        return true;
    }
    else if (this.wait_state && state.name!=this.wait_state){
        // if we *have* a state to actually wait for, we just wait
        return false;
    }else if(state.name in this.definition.final_states){
        this.we_are_done();
    }else if(state.name in this.definition.just_wait_states){
        this.wait();
    }else if(state.name in this.definition.reset_wait_states){
        this.set_wait_state_undefined();
    }else if(state.name in this.definition.action_states){
        this.definition.action_states[state.name]();
    }
    else
        throw new Error(this.name+":"+state.name+"["+state.index+"] unknown or not handled.");
}

Handler_Function.prototype.set_wait_state_undefined = function(){
    console.log("set_wait_state_undefined: this:");
    print_object(this);
    this.wait_state = undefined;
}

Handler_Function.prototype.wait = function(){
    console.log("wait: this:"+this);
    // we do nothing here, 
    // esp. we do not alter the wait_state
}

Handler_Function.prototype.we_are_done = function(){
    this.done = true;
}

var send_command_expect_state = function(command, expectation)
{
    return function(){
        console.out(this.name+'in '+this.current_state.name
            +"..."+command+".");    
        dim.send(command);
        this.wait_state = expectation;
    }
}

var throw_string_exception = function(message){
    return function(){
        throw message;
    }
}

var throw_error = function(){
    throw new Error(this.name+':'
        +state.name+"["+state.index+"] in error state.");
}

include("scripts/handlePwrCameraOn.js");
include("scripts/handleBiasVoltageOff.js");
include("scripts/handleFtmIdle.js");
include("scripts/handleFscConnected.js");
include("scripts/handleFeedbackConnected.js");
include("scripts/handleRatectrlConnected.js");
include("scripts/handleLidClosed.js");
include("scripts/handleFadConnected.js");
include("scripts/handleDriveArmed.js");