document.getElementById("info").innerHTML += "paper width (px)" + document.getElementById("paper").offsetWidth + "<br/>";
function css(element, property) {
    return window.getComputedStyle(element, null).getPropertyValue(property);
}
var paper = document.getElementById('paper');
var paperPage1 = document.getElementById('paper-page1');
var font_family = css(paper, 'font-family');
var font_size = css(paper, 'font-size');
paper.addEventListener('input', getWordsWidth);
paper.addEventListener('keydown', function (e) {
    if (e.key == " ") { //enter
        e.preventDefault(); //Prevent default browser behavior
        var sel;
        var range;
        sel = window.getSelection();
        range = sel.getRangeAt(0);
        range.deleteContents();
        var textNode = document.createTextNode('\u00A0'); // no linebreaking-space
        range.insertNode(textNode);
        range.setStartAfter(textNode);
        sel.addRange(range);
        getWordsWidth();
        // paper.innerHTML+= paper.innerHTML;
        //var currentPage = document.getElementById(getCaretCurrentPageId());
        //var currentRange = getCursorLengthRange(currentPage);
        //var HTMLBeforeCaret = rangeToHTMLFragement(currentRange);
    }
});
// 如果游標在 contentdiveditable id "paper-page1" 裡面，
// 該函數返回 "paper-page1"
function getCaretCurrentPageId() {
    var anchorNode = window.getSelection().anchorNode;
    var currentNode = anchorNode;
    while (currentNode.id === undefined || !(currentNode.id.match(/^paper-page\d+/))) {
        currentNode = currentNode.parentNode;
    }
    return currentNode.id;
}
// 得到子節點（文字物件）
// ["dolore", [ "m ips", ["um si"], "t am"], "et"]
function getChildNodes(ele) {
    var res_array;
    res_array = [];
    if (ele.nodeType == Node.TEXT_NODE) {
        return ele;
    }
    else {
        for (var i = 0; i < ele.childNodes.length; i++) {
            res_array.push(getChildNodes((ele.childNodes[i])));
        }
        return res_array;
    }
}
// 平坦化陣列
// [a, [b, c, d], [[e]]] => [a, b, c, d, e]
function flatten(arr) {
    if (!Array.isArray(arr)) {
        return arr;
    }
    else {
        var result = [];
        for (var i = 0; i < arr.length; i++) {
            if (Array.isArray(arr[i])) {
                result = result.concat(flatten(arr[i]));
            }
            else {
                result.push(arr[i]);
            }
        }
        return result;
    }
}
/* 從第幾個字到第幾個字選 range. */
function selecRengeFromCharToChar(i, j, ele) {
    var range = document.createRange();
    var sel = document.getSelection();
    var flattened_ar = flatten(getChildNodes(ele));
    range.selectNodeContents(ele);
    var ran_start = i;
    var ran_end = j;
    var ran_start_is_set = false;
    for (var i = 0; i < flattened_ar.length; i++) {
        var fragement_text_length = flattened_ar[i].textContent.length;
        // 如果 ran_start > 碎片長度
        if (ran_start > fragement_text_length) {
            ran_start -= fragement_text_length;
            ran_end -= fragement_text_length;
            // 如果 ran_start <= 碎片長度
        }
        else if (ran_start <= fragement_text_length && ran_start_is_set == false) {
            range.setStart(flattened_ar[i], ran_start);
            ran_start_is_set = true;
            // 如果 ran_end > 碎片長度
            if (ran_end > fragement_text_length) {
                ran_end -= fragement_text_length;
                // 如果 ran_end <= 碎片長度，setEnd 中止迴圈
            }
            else {
                range.setEnd(flattened_ar[i], ran_end);
                break;
            }
            // 如果 ran_end > 碎片長度
        }
        else if (ran_end > fragement_text_length && ran_start_is_set == true) {
            ran_end -= fragement_text_length;
        }
        // 如果 ran_end <= 碎片長度，setEnd 中止迴圈
        else {
            range.setEnd(flattened_ar[i], ran_end);
            break;
        }
    }
    var sel = window.getSelection();
    sel.removeAllRanges();
    sel.addRange(range);
    return range;
}
/*
設置游標位置於 ele 要素的第 col 個字（不含標籤），例子：

HTML <div>dolore<i>m ips<b>um si</b>t am</i>et&nbsp;1234<div>
setCaret(document.getElementById('paper-page1'),10)
                  V CARET
<div>dolore<i>m ip|s<b>um si</b>t am</i>et&nbsp;1234<div>
*/
function setCaret(ele, col) {
    var range = document.createRange();
    var sel = document.getSelection();
    var flattened_ar = flatten(getChildNodes(ele)); // flattened array
    range.selectNodeContents(ele);
    var ran_start = col;
    for (var i = 0; i < flattened_ar.length; i++) {
        var fragement_text_length = flattened_ar[i].textContent.length;
        if (ran_start > fragement_text_length) {
            ran_start -= fragement_text_length;
        }
        else {
            range.setEnd(flattened_ar[i], ran_start);
            range.collapse();
            break;
        }
    }
    var sel = window.getSelection();
    sel.removeAllRanges();
    sel.addRange(range);
}
// 將座標轉成座標所在位置的 range
function getCursorLengthRange(ele) {
    var win = ele.ownerDocument.defaultView;
    var range = win.getSelection().getRangeAt(0);
    var cloneRange = range.cloneRange();
    cloneRange.selectNodeContents(ele);
    cloneRange.setEnd(range.endContainer, range.endOffset);
    return cloneRange;
}
// 將座標 range 轉成字串的長度
function rangeToStringLen(range) {
    return range.toString().length;
}
// 將座標位置 range 轉成 html 斷片
function rangeToHTMLFragement(range) {
    var nodes = range.cloneContents().childNodes;
    var result = "";
    for (var i = 0; i < nodes.length; i++) {
        var parentNode = nodes[i].parentNode;
        var div = document.createElement("div");
        div.appendChild(parentNode);
        if (typeof (nodes[i].outerHTML) === "undefined") {
            result += nodes[i].textContent;
        }
        else {
            result += nodes[i].outerHTML;
        }
        console.log("Parent Node" + div.outerHTML);
    }
    return result;
}
// 得到一個 word 或是 character 的寬度
function getTextWidth(text, fontfamily, fontsize) {
    console.log(text);
    var decodedText = decodeEntities(text);
    var canvas = document.createElement("canvas");
    var context = canvas.getContext("2d");
    context.font = fontsize + " " + fontfamily;
    var width = context.measureText(decodedText).width;
    return width;
}
// 得到字寬
function getWordsWidth() {
    document.getElementById('line-info').innerHTML = "";
    var array = paper.childNodes;
    var res = [];
    for (var i = 0; i < array.length; i++) {
        if (array[i].nodeType != Node.TEXT_NODE) {
            res.push(array[i]);
        }
    }
    var innerArray = res.map(function (x) { return x.innerHTML; });
    var innerHTMLTotal = innerArray.reduce(function (x, y) { return (x + y); });
    var innerHTMLRemoveTags = innerHTMLTotal.replace(/[<][\/]?[^<]+[\/]?[>]/gi, ""); // 移除標籤
    var innerHTMLSplitted = innerHTMLRemoveTags.split(/(　|\s|&nbsp;|[⺀-\u2efe\u3000-〾㇀-\u31ee㌀-㏾㐀-\u4dbe一-\u9ffe豈-\ufafe︰-﹎]|[\ud840-\ud868\ud86a-\ud86c][\udc00-\udfff]|\ud869[\udc00-\udede\udf00-\udfff]|\ud86d[\udc00-\udf3e\udf40-\udfff]|\ud86e[\udc00-\udc1e]|\ud87e[\udc00-\ude1e])/).filter(function (item) { return item != ""; });
    console.log(innerHTMLSplitted);
    //var innerHTMLSplittedLength = innerHTMLSplitted.map((x)=>x.length)
    //var innerHTMLSelectedRange = [];
    /*var sum = 0
    for (var i=0; i<innerHTMLSplittedLength.length;i++){
     var head = sum;
     var tail = sum + innerHTMLSplittedLength[i];
     innerHTMLSelectedRange.push([head, tail]);
     sum+= innerHTMLSplittedLength[i];
    }*/
    /*var innerHTMLSplittedRange = innerHTMLSelectedRange.map((x) => rangeToHTMLFragement(selecRengeFromCharToChar(x[0],x[1],paper)))
  
    console.log("Range 結果"+innerHTMLSplittedRange);*/
    var textWidthList = innerHTMLSplitted.map(function (x) { return getTextWidth(x, font_family, font_size); });
    var lineInfoLength = [];
    for (var i = 0; i < innerHTMLSplitted.length; i++) {
        var object = { "content": innerHTMLSplitted[i],
            "length": textWidthList[i] };
        document.getElementById("line-info").innerHTML += "(" + innerHTMLSplitted[i] + ",";
        document.getElementById("line-info").innerHTML += textWidthList[i] + ")";
        lineInfoLength.push(object);
    }
    // document.getElementById("info").innerHTML += lineInfoLength;
}
// 將要在地幾個字插入符號，改為修正為在有標籤的 HTML 的片段中，第幾個不算標籤的字插入符號
/*
> getrealcol(5, "example")
> 5
> getrealcol(5, "e<em>xam</em>ple")
> 14
*/
function getrealcol(n, str) {
    var arr = str.split(RegExp("(<[^<>]+>)")).map(function (x) { return ({ cont: x, len: x.length }); });
    var j = 0;
    var k = 0;
    for (var i = 0; i < arr.length; i++) {
        if (arr[i].cont.match(/^[<]/)) {
            continue;
        }
        else {
            if (n > arr[i].len) {
                n = n - arr[i].len;
            }
            else {
                j = i;
                k = n;
                break;
            }
        }
        ;
    }
    var res_col = 0;
    for (var i = 0; i < j; i++) {
        res_col += arr[i].len;
    }
    res_col += k;
    return res_col;
}
// 解碼 &1234; 這種東西用
function decodeEntities(encodedString) {
    var textArea = document.createElement('textarea');
    textArea.innerHTML = encodedString;
    return textArea.value;
}