// Copyright (C) 2008 Robert W. Clarke Consulting, all rights reserved.
// do not remove this copyright notice

function updateLegend(data_type){ // called from pull down menu on control panel
	// this function updates the legend below the map according to data type
	var legend_div = document.getElementById('legend_div');
	legend_div.innerHTML = ary_legend[data_type]; // tpop or dpop
	if(system_init){
		sendXML(ary_frames[current_frame][data_type]);
	}
}


var interval_run;
var run_pause = "pause";
function setControl(directive){
	var run_pause_btn = document.getElementById("btn_runpause");
	var form_obj = document.forms.control_form;
	
	switch(directive){
		case "toggle":
			if(run_pause == "pause"){ 
				run_pause = "run";
				var int_rate = getSelectedRadioValue(form_obj.rate)
				interval_run = setInterval('runSequence(1)', int_rate);
				run_pause_btn.src="btn_pause.gif";
			} else { // pause
				run_pause = "pause"; 
				clearInterval(interval_run);
				run_pause_btn.src="btn_run.gif";
			}
		break;
		
		case "run":
			run_pause = "run";
			var int_rate = getSelectedRadioValue(form_obj.rate)
			interval_run = setInterval('runSequence(1)', int_rate);
			run_pause_btn.src="btn_pause.gif";
		break;
		
		case "pause":
			clearInterval(interval_run);
			run_pause = "pause"; 
			run_pause_btn.src="btn_run.gif";
		break;
		
		case "leftstop":
			clearInterval(interval_run);
			run_pause = "pause"; 
			run_pause_btn.src="btn_run.gif";
			runSequence(0);
		break;
		
		case "rightstop":
			clearInterval(interval_run);
			run_pause = "pause"; 
			run_pause_btn.src="btn_run.gif";
			runSequence(ary_frames.length-1);
		break;
		
		case "prev":
			clearInterval(interval_run);
			run_pause = "pause"; 
			run_pause_btn.src="btn_run.gif";
			runSequence(-1);
		break;
		
		case "next":
			clearInterval(interval_run);
			run_pause = "pause"; 
			run_pause_btn.src="btn_run.gif";
			runSequence(1);
		break;
		
	}
	
}


var current_frame = 0;
function runSequence(direction){ // called when page loads, by control panel buttons, or interval
	if(direction == 0){ // go to beginning
		current_frame = 0;
	} else { // backwards or forwards
		current_frame += direction;
		if(direction > 0){
			if(current_frame >= ary_frames.length){ // reached end
				current_frame = ary_frames.length -1;
				if(document.forms.control_form.loop.checked){ // loop enabled, start over
					if(run_pause == "run"){ // only if auto-play frames
						current_frame = 0;
					}
				} else { // don't loop
					clearInterval(interval_run);
					run_pause = "pause";
					var run_pause_btn = document.getElementById("btn_runpause");
					run_pause_btn.src="btn_run.gif";
				}
			}
		}
		if(direction < 0){
			if(current_frame <= 0){
				current_frame = 0;
			}
		}
	}
	var dtype = getSelectedRadioValue(document.forms.control_form.dtype);
	sendXML(ary_frames[current_frame][dtype]); // sends current frame xml to map
	updateStateData(current_frame);
}

function getSelectedRadioValue(radio_obj){
	var i;
	for(i=0;i<radio_obj.length;i++){
		if(radio_obj[i].checked){
			return radio_obj[i].value;
		}
	}
}

function updateStateData(frame){ // called from runSequence()
	// this function updates the state data in the control panel box
	// txt_obj = document.forms.control_form.statedata;
	var year = ary_years[frame];
	var tpop, dpop, prev_year,state_info;
	if(selected_state_id == null){ // no state clicked on (initial value)
		state_info = "Click on state\nto show data here";
	} else {
		tpop = ary_popdat[selected_state_id][year];
		state_info = selected_state_id + ' - ' + ary_state[selected_state_id] + "\n";
		state_info += "Year: " + year + "\n";
		state_info += "Pop: " + formaThousands(tpop) + "\n";
		if(frame > 0){
			prev_year = ary_years[frame-1]
			dpop = ary_popdat[selected_state_id][year]-ary_popdat[selected_state_id][prev_year];
			dpop_percent = dpop/ary_popdat[selected_state_id][prev_year] * 100;
			state_info += "Change: " + formaThousands(dpop) + "\n";
			state_info += "Change: " + dpop_percent.toFixed(1) + "%";
		}
	}
	// txt_obj.value = state_info;
	document.getElementById("statedata_div").innerHTML = nlToBR(state_info);
}

var selected_state_id = "AL";
function selectState(state_id){ // called from the map when user clicks on state
	selected_state_id = state_id;
	updateStateData(current_frame);
}

function nlToBR(str){
	var re = /\n/g;
	return str.replace(re,'<br />');
}