// mercurial.js - JavaScript utility functions

//

// Rendering of branch DAGs on the client side

// Display of elapsed time

// Show or hide diffstat

//

// Copyright 2008 Dirkjan Ochtman <dirkjan AT ochtman DOT nl>

// Copyright 2006 Alexander Schremmer <alex AT alexanderweb DOT de>

//

// derived from code written by Scott James Remnant <scott@ubuntu.com>

// Copyright 2005 Canonical Ltd.

//

// This software may be used and distributed according to the terms

// of the GNU General Public License, incorporated herein by reference.

var colors = [

	[ 1.0, 0.0, 0.0 ],

	[ 1.0, 1.0, 0.0 ],

	[ 0.0, 1.0, 0.0 ],

	[ 0.0, 1.0, 1.0 ],

	[ 0.0, 0.0, 1.0 ],

	[ 1.0, 0.0, 1.0 ]

];

function Graph() {

	this.canvas = document.getElementById('graph');

	if (window.G_vmlCanvasManager) this.canvas = window.G_vmlCanvasManager.initElement(this.canvas);

	this.ctx = this.canvas.getContext('2d');

	this.ctx.strokeStyle = 'rgb(0, 0, 0)';

	this.ctx.fillStyle = 'rgb(0, 0, 0)';

	this.bg = [0, 4];

	this.cell = [2, 0];

	this.columns = 0;

}

Graph.prototype = {

	reset: function() {

		this.bg = [0, 4];

		this.cell = [2, 0];

		this.columns = 0;

	},

	scale: function(height) {

		this.bg_height = height;

		this.box_size = Math.floor(this.bg_height / 1.2);

		this.cell_height = this.box_size;

	},

	setColor: function(color, bg, fg) {

		// Set the colour.

		//

		// If color is a string, expect an hexadecimal RGB

		// value and apply it unchanged. If color is a number,

		// pick a distinct colour based on an internal wheel;

		// the bg parameter provides the value that should be

		// assigned to the 'zero' colours and the fg parameter

		// provides the multiplier that should be applied to

		// the foreground colours.

		var s;

		if(typeof color === "string") {

			s = "#" + color;

		} else { //typeof color === "number"

			color %= colors.length;

			var red = (colors[color][0] * fg) || bg;

			var green = (colors[color][1] * fg) || bg;

			var blue = (colors[color][2] * fg) || bg;

			red = Math.round(red * 255);

			green = Math.round(green * 255);

			blue = Math.round(blue * 255);

			s = 'rgb(' + red + ', ' + green + ', ' + blue + ')';

		}

		this.ctx.strokeStyle = s;

		this.ctx.fillStyle = s;

		return s;

	},

	edge: function(x0, y0, x1, y1, color, width) {

		this.setColor(color, 0.0, 0.65);

		if(width >= 0)

			 this.ctx.lineWidth = width;

		this.ctx.beginPath();

		this.ctx.moveTo(x0, y0);

		this.ctx.lineTo(x1, y1);

		this.ctx.stroke();

	},

	vertex: function(x, y, radius, color, parity, cur) {

		this.ctx.beginPath();

		this.setColor(color, 0.25, 0.75);

		this.ctx.arc(x, y, radius, 0, Math.PI * 2, true);

		this.ctx.fill();

		var left = (this.bg_height - this.box_size) + (this.columns + 1) * this.box_size;

		var item = document.querySelector('[data-node="' + cur.node + '"]');

		if (item) {

			item.style.paddingLeft = left + 'px';

		}

	},

	render: function(data) {

		var i, j, cur, line, start, end, color, x, y, x0, y0, x1, y1, column, radius;

		var cols = 0;

		for (i = 0; i < data.length; i++) {

			cur = data[i];

			for (j = 0; j < cur.edges.length; j++) {

				line = cur.edges[j];

				cols = Math.max(cols, line[0], line[1]);

			}

		}

		this.canvas.width = (cols + 1) * this.bg_height;

		this.canvas.height = (data.length + 1) * this.bg_height - 27;

		for (i = 0; i < data.length; i++) {

			var parity = i % 2;

			this.cell[1] += this.bg_height;

			this.bg[1] += this.bg_height;

			cur = data[i];

			var fold = false;

			var prevWidth = this.ctx.lineWidth;

			for (j = 0; j < cur.edges.length; j++) {

				line = cur.edges[j];

				start = line[0];

				end = line[1];

				color = line[2];

				var width = line[3];

				if(width < 0)

					 width = prevWidth;

				var branchcolor = line[4];

				if(branchcolor)

					color = branchcolor;

				if (end > this.columns || start > this.columns) {

					this.columns += 1;

				}

				if (start === this.columns && start > end) {

					fold = true;

				}

				x0 = this.cell[0] + this.box_size * start + this.box_size / 2;

				y0 = this.bg[1] - this.bg_height / 2;

				x1 = this.cell[0] + this.box_size * end + this.box_size / 2;

				y1 = this.bg[1] + this.bg_height / 2;

				this.edge(x0, y0, x1, y1, color, width);

			}

			this.ctx.lineWidth = prevWidth;

			// Draw the revision node in the right column

			column = cur.vertex[0];

			color = cur.vertex[1];

			radius = this.box_size / 8;

			x = this.cell[0] + this.box_size * column + this.box_size / 2;

			y = this.bg[1] - this.bg_height / 2;

			if (fold) this.columns -= 1;

		}

	}

};

function process_dates(parentSelector){

	// derived from code from mercurial/templatefilter.py

	var scales = {

		'year':  365 * 24 * 60 * 60,

		'month':  30 * 24 * 60 * 60,

		'week':    7 * 24 * 60 * 60,

		'day':    24 * 60 * 60,

		'hour':   60 * 60,

		'minute': 60,

		'second': 1

	};

	function format(count, string){

		var ret = count + ' ' + string;

		if (count > 1){

			ret = ret + 's';

		}

 		return ret;

 	}

	function shortdate(date){

		var ret = date.getFullYear() + '-';

		// getMonth() gives a 0-11 result

		var month = date.getMonth() + 1;

		if (month <= 9){

			ret += '0' + month;

		} else {

			ret += month;

		}

		ret += '-';

		var day = date.getDate();

		if (day <= 9){

			ret += '0' + day;

		} else {

			ret += day;

		}

		return ret;

	}

 	function age(datestr){

 		var now = new Date();

 		var once = new Date(datestr);

		if (isNaN(once.getTime())){

			// parsing error

			return datestr;

		}

		var delta = Math.floor((now.getTime() - once.getTime()) / 1000);

		var future = false;

		if (delta < 0){

			future = true;

			delta = -delta;

			if (delta > (30 * scales.year)){

				return "in the distant future";

			}

		}

		if (delta > (2 * scales.year)){

			return shortdate(once);

		}

		for (var unit in scales){

			if (!scales.hasOwnProperty(unit)) { continue; }

			var s = scales[unit];

			var n = Math.floor(delta / s);

			if ((n >= 2) || (s === 1)){

				if (future){

					return format(n, unit) + ' from now';

				} else {

					return format(n, unit) + ' ago';

				}

			}

		}

	}

	var nodes = document.querySelectorAll((parentSelector || '') + ' .age');

	var dateclass = new RegExp('\\bdate\\b');

	for (var i=0; i<nodes.length; ++i){

		var node = nodes[i];

		var classes = node.className;

		var agevalue = age(node.textContent);

		if (dateclass.test(classes)){

			// We want both: date + (age)

			node.textContent += ' ('+agevalue+')';

		} else {

			node.title = node.textContent;

			node.textContent = agevalue;

		}

	}

}

function toggleDiffstat() {

    var curdetails = document.getElementById('diffstatdetails').style.display;

    var curexpand = curdetails === 'none' ? 'inline' : 'none';

    document.getElementById('diffstatdetails').style.display = curexpand;

    document.getElementById('diffstatexpand').style.display = curdetails;

}

function toggleLinewrap() {

    function getLinewrap() {

        var nodes = document.getElementsByClassName('sourcelines');

        // if there are no such nodes, error is thrown here

        return nodes[0].classList.contains('wrap');

    }

    function setLinewrap(enable) {

        var nodes = document.getElementsByClassName('sourcelines');

        var i;

        for (i = 0; i < nodes.length; i++) {

            if (enable) {

                nodes[i].classList.add('wrap');

            } else {

                nodes[i].classList.remove('wrap');

            }

        }

        var links = document.getElementsByClassName('linewraplink');

        for (i = 0; i < links.length; i++) {

            links[i].innerHTML = enable ? 'on' : 'off';

        }

    }

    setLinewrap(!getLinewrap());

}

function format(str, replacements) {

    return str.replace(/%(\w+)%/g, function(match, p1) {

        return String(replacements[p1]);

    });

}

function makeRequest(url, method, onstart, onsuccess, onerror, oncomplete) {

    var xhr = new XMLHttpRequest();

    xhr.onreadystatechange = function() {

        if (xhr.readyState === 4) {

            try {

                if (xhr.status === 200) {

                    onsuccess(xhr.responseText);

                } else {

                    throw 'server error';

                }

            } catch (e) {

                onerror(e);

            } finally {

                oncomplete();

            }

        }

    };

    xhr.open(method, url);

    xhr.overrideMimeType("text/xhtml; charset=" + document.characterSet.toLowerCase());

    xhr.send();

    onstart();

    return xhr;

}

function removeByClassName(className) {

    var nodes = document.getElementsByClassName(className);

    while (nodes.length) {

        nodes[0].parentNode.removeChild(nodes[0]);

    }

}

function docFromHTML(html) {

    var doc = document.implementation.createHTMLDocument('');

    doc.documentElement.innerHTML = html;

    return doc;

}

function appendFormatHTML(element, formatStr, replacements) {

    element.insertAdjacentHTML('beforeend', format(formatStr, replacements));

}

function adoptChildren(from, to) {

    var nodes = from.children;

    var curClass = 'c' + Date.now();

    while (nodes.length) {

        var node = nodes[0];

        node = document.adoptNode(node);

        node.classList.add(curClass);

        to.appendChild(node);

    }

    process_dates('.' + curClass);

}

function ajaxScrollInit(urlFormat,

                        nextPageVar,

                        nextPageVarGet,

                        containerSelector,

                        messageFormat,

                        mode) {

    var updateInitiated = false;

    var container = document.querySelector(containerSelector);

    function scrollHandler() {

        if (updateInitiated) {

            return;

        }

        var scrollHeight = document.documentElement.scrollHeight;

        var clientHeight = document.documentElement.clientHeight;

        var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;

        if (scrollHeight - (scrollTop + clientHeight) < 50) {

            updateInitiated = true;

            removeByClassName('scroll-loading-error');

            container.lastElementChild.classList.add('scroll-separator');

            if (!nextPageVar) {

                var message = {

                    'class': 'scroll-loading-info',

                    text: 'No more entries'

                };

                appendFormatHTML(container, messageFormat, message);

                return;

            }

            makeRequest(

                format(urlFormat, {next: nextPageVar}),

                'GET',

                function onstart() {

                    var message = {

                        'class': 'scroll-loading',

                        text: 'Loading...'

                    };

                    appendFormatHTML(container, messageFormat, message);

                },

                function onsuccess(htmlText) {

                    var doc = docFromHTML(htmlText);

                    if (mode === 'graph') {

                        var graph = window.graph;

                        var dataStr = htmlText.match(/^\s*var data = (.*);$/m)[1];

                        var data = JSON.parse(dataStr);

                        if (data.length < nextPageVar) {

                            nextPageVar = undefined;

                        }

                        graph.reset();

                        adoptChildren(doc.querySelector('#graphnodes'), container.querySelector('#graphnodes'));

                        graph.render(data);

                    } else {

                        adoptChildren(doc.querySelector(containerSelector), container);

                    }

                    nextPageVar = nextPageVarGet(htmlText, nextPageVar);

                },

                function onerror(errorText) {

                    var message = {

                        'class': 'scroll-loading-error',

                        text: 'Error: ' + errorText

                    };

                    appendFormatHTML(container, messageFormat, message);

                },

                function oncomplete() {

                    removeByClassName('scroll-loading');

                    updateInitiated = false;

                    scrollHandler();

                }

            );

        }

    }

    window.addEventListener('scroll', scrollHandler);

    window.addEventListener('resize', scrollHandler);

    scrollHandler();

}

function renderDiffOptsForm() {

    // We use URLSearchParams for query string manipulation. Old browsers don't

    // support this API.

    if (!("URLSearchParams" in window)) {

        return;

    }

    var form = document.getElementById("diffopts-form");

    var KEYS = [

        "ignorews",

        "ignorewsamount",

        "ignorewseol",

        "ignoreblanklines",

    ];

    var urlParams = new window.URLSearchParams(window.location.search);

    function updateAndRefresh(e) {

        var checkbox = e.target;

        var name = checkbox.id.substr(0, checkbox.id.indexOf("-"));

        urlParams.set(name, checkbox.checked ? "1" : "0");

        window.location.search = urlParams.toString();

    }

    var allChecked = form.getAttribute("data-ignorews") === "1";

    for (var i = 0; i < KEYS.length; i++) {

        var key = KEYS[i];

        var checkbox = document.getElementById(key + "-checkbox");

        if (!checkbox) {

            continue;

        }

        var currentValue = form.getAttribute("data-" + key);

        checkbox.checked = currentValue !== "0";

        // ignorews implies ignorewsamount and ignorewseol.

        if (allChecked && (key === "ignorewsamount" || key === "ignorewseol")) {

            checkbox.checked = true;