/*
 * auto-reload.js
 * https://github.com/savetheinternet/Tinyboard/blob/master/js/auto-reload.js
 *
 * Brings AJAX to Tinyboard.
 *
 * Released under the MIT license
 * Copyright (c) 2012 Michael Save <savetheinternet@tinyboard.org>
 * Copyright (c) 2013-2014 Marcin Łabanowski <marcin@6irc.net>
 * Copyright (c) 2013 undido <firekid109@hotmail.com>
 * Copyright (c) 2014 Fredrick Brennan <admin@8chan.co>
 *
 * Usage:
 *   $config['additional_javascript'][] = 'js/jquery.min.js';
 *   //$config['additional_javascript'][] = 'js/titlebar-notifications.js';
 *   $config['additional_javascript'][] = 'js/auto-reload.js';
 *
 */

au = false;
auto_reload_enabled = true; // for watch.js to interop

function makeIcon(){
    if(au) return;
    au = true;
    $("link[rel='icon']").attr("href", "../static/favicon_au.png");
}

$(document).ready(function(){
    if($('div.banner').length == 0)
	return; // not index

    if($(".post.op").size() != 1)
	return; //not thread page

    var countdown_interval;

    // Add an update link
    $(".threadlinks span:last-child").after("<span id='updater'><a href='#' id='update_thread' style='padding-left:10px'>"+_("Update")+"</a> ] (<input type='checkbox' id='auto_update_status' checked> "+_("Auto")+") <span id='update_secs'></span></span>");

    // Grab the settings
    var settings = new script_settings('auto-reload');
    var poll_interval_mindelay        = settings.get('min_delay_bottom', 5000);
    var poll_interval_maxdelay        = settings.get('max_delay', 600000);
    var poll_interval_errordelay      = settings.get('error_delay', 30000);

    // number of ms to wait before reloading
    var poll_interval_delay = poll_interval_mindelay;
    var poll_current_time = poll_interval_delay;

    var end_of_page = false;

    var new_posts = 0;
    var first_new_post = null;

    var title = document.title;

    if (typeof update_title == "undefined") {
	var update_title = function() {
	    if (new_posts) {
		document.title = "("+new_posts+") "+title;
	    } else {
		document.title = title;
	    }
	};
    }

    if (typeof add_title_collector != "undefined")
	add_title_collector(function(){
	    return new_posts;
	});

    var window_active = true;
    $(window).focus(function() {
	window_active = true;
	recheck_activated();

	// Reset the delay if needed
	if(settings.get('reset_focus', true)) {
	    poll_interval_delay = poll_interval_mindelay;
	}
    });
    $(window).blur(function() {
	window_active = false;
    });


    $('#auto_update_status').click(function() {
	if($("#auto_update_status").is(':checked')) {
	    auto_update(poll_interval_mindelay);
	} else {
	    stop_auto_update();
	    $('#update_secs').text("");
	}

    });


    var decrement_timer = function() {
	poll_current_time = poll_current_time - 1000;
	$('#update_secs').text(poll_current_time/1000);

	if (poll_current_time <= 0) {
	    poll(manualUpdate = false);
	}
    }

    var recheck_activated = function() {
	if (new_posts && window_active &&
	    $(window).scrollTop() + $(window).height() >=
	    $('footer').position().top) {

	    new_posts = 0;
	}
	update_title();
	first_new_post = null;
    };

    // automatically updates the thread after a specified delay
    var auto_update = function(delay) {
	clearInterval(countdown_interval);

	poll_current_time = delay;
	countdown_interval = setInterval(decrement_timer, 1000);
	$('#update_secs').text(poll_current_time/1000);
    }

    var stop_auto_update = function() {
	clearInterval(countdown_interval);
    }

    var epoch = (new Date).getTime();
    var epochold = epoch;

    var timeDiff = function (delay) {
	if((epoch-epochold) > delay) {
	    epochold = epoch = (new Date).getTime();
	    return true;
	}else{
	    epoch = (new Date).getTime();
	    return;
	}
    }

    var poll = function(manualUpdate) {
	stop_auto_update();
	$('#update_secs').text(_("Updating..."));

	$.ajax({
	    url: document.location,
	    success: function(data) {
		var loaded_posts = 0;	// the number of new posts loaded in this update
		$(data).find('div.postcontainer').each(function() {
		    var id = $(this).attr('id').substring(2);
		    if($('#' + id).length == 0) {
			if (!new_posts) {
			    first_new_post = this;
			    makeIcon();
			}
			$(this).insertAfter($('div.postcontainer:last').next()).after('<br class="clear">');
			new_posts++;
			loaded_posts++;
			$(document).trigger('new_post', this);
			recheck_activated();
		    }
		});
		time_loaded = Date.now(); // interop with watch.js


		if ($('#auto_update_status').is(':checked')) {
		    // If there are no new posts, double the delay. Otherwise set it to the min.
		    if(loaded_posts == 0) {
			// if the update was manual, don't increase the delay
			if (manualUpdate == false) {
			    poll_interval_delay *= 2;

			    // Don't increase the delay beyond the maximum
			    if(poll_interval_delay > poll_interval_maxdelay) {
				poll_interval_delay = poll_interval_maxdelay;
			    }
			}
		    } else {
			poll_interval_delay = poll_interval_mindelay;
		    }

		    auto_update(poll_interval_delay);
		} else {
		    // Decide the message to show if auto update is disabled
		    if (loaded_posts > 0)
			$('#update_secs').text(fmt(_("Thread updated with {0} new post(s)"), [loaded_posts]));
		    else
			$('#update_secs').text(_("No new posts found"));
		}
	    },
	    error: function(xhr, status_text, error_text) {
		if (status_text == "error") {
		    if (error_text == "Not Found") {
			$('#update_secs').text(_("Thread deleted or pruned"));
			$('#auto_update_status').prop('checked', false);
			$('#auto_update_status').prop('disabled', true); // disable updates if thread is deleted
			return;
		    } else {
			$('#update_secs').text("Error: "+error_text);
		    }
		} else if (status_text) {
		    $('#update_secs').text(_("Error: ")+status_text);
		} else {
		    $('#update_secs').text(_("Unknown error"));
		}

		// Keep trying to update
		if ($('#auto_update_status').is(':checked')) {
		    poll_interval_delay = poll_interval_errordelay;
		    auto_update(poll_interval_delay);
		}
	    }
	});

	return false;
    };

    $(window).scroll(function() {
	recheck_activated();

	// if the newest post is not visible
	if($(this).scrollTop() + $(this).height() <
	   $('div.post:last').position().top + $('div.post:last').height()) {
	    end_of_page = false;
	    return;
	} else {
	    if($("#auto_update_status").is(':checked') && timeDiff(poll_interval_mindelay)) {
		poll(manualUpdate = true);
	    }
	    end_of_page = true;
	}
    });

    $('#update_thread').on('click', function() { poll(manualUpdate = true); return false; });

    if($("#auto_update_status").is(':checked')) {
	auto_update(poll_interval_delay);
    }
});