var rowData = [];
var data = {};
var colors = d3.scale.category20().range();

function readSingleFile(evt) {
    //Retrieve the first (and only!) File from the FileList object
    var f = evt.target.files[0];

    if (f) {
        var r = new FileReader();
        r.onload = function (e) {
            var contents = e.target.result;
            var data = CSV2JSON(contents);
            rowData = data;
            processDate();
        }
        r.readAsText(f);
    } else {
        alert("Failed to load file");
    }
    evt.target.value = ""
}

document.getElementById('fileinput').addEventListener('change', readSingleFile, false);

d3.csv("data.csv")
    .get(function (error, rows) {
        rowData = rows;
        processDate(rows);
    });

function processDate() {
    data.words = d3.nest()
        .key(function (d) {
            return d.Word;
        })
        .key(function (d) {
            return d.Category;
        })
        .entries(rowData);
    data.group = d3.nest().key(function (d) { return d.Word }).entries(rowData).map(function (d) { return d.key });
    data.category = d3.nest()
        .key(function (d) {
            return d.Category;
        }).entries(rowData).map(function (d, c) {
            return { name: d.key, color: colors[c] };
        });
    data.categoryNames = data.category.map(function (d) { return d.name });
    var items = document.querySelectorAll("#header UL .colorPicker");
    for (var i = 0; i < items.length; i++) {
        items[i].remove();
    }

    data.categoryNames.forEach(function (d, i) {
        var div = document.createElement("LI");
        div.setAttribute("class", "colorPicker");

        var text = document.createElement("SPAN");
        text.innerText = d;
        div.appendChild(text);

        var color = document.createElement("INPUT");
        color.setAttribute("type", "color");
        color.value = colors[i];
        color.setAttribute("id", "color_" + (i + 1));

        color.addEventListener("input", function () {
            colors[i] = color.value;
            //drawWordCount();
            processDate();
        }, false);

        div.appendChild(color);

        document.querySelector("#header UL").appendChild(div);
        //document.body.appendChild(x);
    });
    data.words.forEach(function (d, index) {
        d.id = "id" + (index + 1);
        d.group = d.values[0].values[0].FEATURE_GROUP;
        d.name = d.key;
        delete d.key;
        d.count = (new Array(data.categoryNames.length)).map(function (d) { return 0; });
        d.values.forEach(function (dd, di) {
            d.count[data.categoryNames.indexOf(d.values[di].key)] = d3.sum(d.values[di].values, function (d) { return +d.Total });
        });
        delete d.values;
    });

    function drawWordCount() {
        var height = parseInt(d3.select("#g-chart").style("height"));
        if (height === 0) {
            height = window.innerHeight - 100;
        }
        var split = false;
        var options = {
            width: parseInt(d3.select("#g-chart").style("width")),
            height: split == true ? (height / 2) * data.group.length : height,
            minRadiusCircle: 15,
            minRadius: 20,
            maxRadius: 70,
            minFontSize: 8,
            collisionPadding: 4,
            searchSelector: "#search",
            chartSelector: "#g-chart",
            split: split
        };
        wordCount(options, data);
    }
    drawWordCount();
}


function CSV2JSON(csvData, headerMapping) {
    var retJSONdata = [];
    var headerData = null;
    var all_rows = null;
    var flag = false;
    var retValue = null;
    var columnSeperator = ",";
    all_rows = csvData.split("\n");
    headerData = splitByChar(all_rows[0], columnSeperator, "\"", "\"", true, true);
    all_rows.splice(0, 1);
    flag = all_rows.every(function (d) {
        if (d.length == 0) {
            return true;
        } else {
            var trmpJSON = {};
            var tempRow = splitByChar(d, columnSeperator, "\"", "\"", true, true);
            if (tempRow.length == headerData.length) {
                headerData.forEach(function (d1, i) {
                    if (headerMapping == undefined || headerMapping[d1] == undefined)
                        trmpJSON[d1] = tempRow[i];
                    else {
                        trmpJSON[headerMapping[d1]] = tempRow[i];
                    }
                });
                retJSONdata.push(trmpJSON);
                return true;
            } else {
                return false;
            }
        }
    });
    if (!flag) {
        throw Error("invalid csv");
    } else {
        retValue = retJSONdata;
    };

    return retValue;
}

function splitByChar(line, splitChar, enclosedStartChar, enclosedEndChar, removeEnclosedChar, trim) {
    var arrFields = [];
    var bracketCounter = 0;
    var currLine = '';
    for (cnt = 0; cnt < line.length; cnt++) {
        if (line.charAt(cnt) == enclosedStartChar) {
            if (enclosedStartChar == enclosedEndChar && bracketCounter > 0) {
                bracketCounter--;
            } else {
                bracketCounter++;
            }
        } else if (line.charAt(cnt) == enclosedEndChar) {
            bracketCounter--;
        }
        if (bracketCounter == 0) {
            //if (line.charAt(cnt) == splitChar) {
            if (line.substr(cnt, splitChar.length) == splitChar) {
                if (removeEnclosedChar == true) {
                    if (currLine.indexOf(enclosedStartChar) == 0) {
                        currLine = currLine.substr(1, currLine.length - 2);
                    }
                }
                if (trim) {
                    currLine = currLine.trim();
                }
                arrFields.push(currLine);
                currLine = "";
                cnt += (splitChar.length - 1);
            } else {
                currLine += line.charAt(cnt);
            }
        } else {
            currLine += line.charAt(cnt);
        }
    }
    if (removeEnclosedChar == true) {
        if (currLine.indexOf(enclosedStartChar) == 0) {
            currLine = currLine.substr(1, currLine.length - 2);
        }
    }
    if (trim) {
        currLine = currLine.trim();
    }
    arrFields.push(currLine);
    return arrFields;
}