"use strict";

ace.define("ace/ext/elastic_tabstops_lite", ["require", "exports", "module", "ace/editor", "ace/config"], function (require, exports, module) {
    "use strict";

    var ElasticTabstopsLite = function ElasticTabstopsLite(editor) {
        this.$editor = editor;
        var self = this;
        var changedRows = [];
        var recordChanges = false;
        this.onAfterExec = function () {
            recordChanges = false;
            self.processRows(changedRows);
            changedRows = [];
        };
        this.onExec = function () {
            recordChanges = true;
        };
        this.onChange = function (e) {
            var range = e.data.range;
            if (recordChanges) {
                if (changedRows.indexOf(range.start.row) == -1) changedRows.push(range.start.row);
                if (range.end.row != range.start.row) changedRows.push(range.end.row);
            }
        };
    };

    (function () {
        this.processRows = function (rows) {
            this.$inChange = true;
            var checkedRows = [];

            for (var r = 0, rowCount = rows.length; r < rowCount; r++) {
                var row = rows[r];

                if (checkedRows.indexOf(row) > -1) continue;

                var cellWidthObj = this.$findCellWidthsForBlock(row);
                var cellWidths = this.$setBlockCellWidthsToMax(cellWidthObj.cellWidths);
                var rowIndex = cellWidthObj.firstRow;

                for (var w = 0, l = cellWidths.length; w < l; w++) {
                    var widths = cellWidths[w];
                    checkedRows.push(rowIndex);
                    this.$adjustRow(rowIndex, widths);
                    rowIndex++;
                }
            }
            this.$inChange = false;
        };

        this.$findCellWidthsForBlock = function (row) {
            var cellWidths = [],
                widths;
            var rowIter = row;
            while (rowIter >= 0) {
                widths = this.$cellWidthsForRow(rowIter);
                if (widths.length == 0) break;

                cellWidths.unshift(widths);
                rowIter--;
            }
            var firstRow = rowIter + 1;
            rowIter = row;
            var numRows = this.$editor.session.getLength();

            while (rowIter < numRows - 1) {
                rowIter++;

                widths = this.$cellWidthsForRow(rowIter);
                if (widths.length == 0) break;

                cellWidths.push(widths);
            }

            return { cellWidths: cellWidths, firstRow: firstRow };
        };

        this.$cellWidthsForRow = function (row) {
            var selectionColumns = this.$selectionColumnsForRow(row);

            var tabs = [-1].concat(this.$tabsForRow(row));
            var widths = tabs.map(function (el) {
                return 0;
            }).slice(1);
            var line = this.$editor.session.getLine(row);

            for (var i = 0, len = tabs.length - 1; i < len; i++) {
                var leftEdge = tabs[i] + 1;
                var rightEdge = tabs[i + 1];

                var rightmostSelection = this.$rightmostSelectionInCell(selectionColumns, rightEdge);
                var cell = line.substring(leftEdge, rightEdge);
                widths[i] = Math.max(cell.replace(/\s+$/g, '').length, rightmostSelection - leftEdge);
            }

            return widths;
        };

        this.$selectionColumnsForRow = function (row) {
            var selections = [],
                cursor = this.$editor.getCursorPosition();
            if (this.$editor.session.getSelection().isEmpty()) {
                if (row == cursor.row) selections.push(cursor.column);
            }

            return selections;
        };

        this.$setBlockCellWidthsToMax = function (cellWidths) {
            var startingNewBlock = true,
                blockStartRow,
                blockEndRow,
                maxWidth;
            var columnInfo = this.$izip_longest(cellWidths);

            for (var c = 0, l = columnInfo.length; c < l; c++) {
                var column = columnInfo[c];
                if (!column.push) {
                    console.error(column);
                    continue;
                }
                column.push(NaN);

                for (var r = 0, s = column.length; r < s; r++) {
                    var width = column[r];
                    if (startingNewBlock) {
                        blockStartRow = r;
                        maxWidth = 0;
                        startingNewBlock = false;
                    }
                    if (isNaN(width)) {
                        blockEndRow = r;

                        for (var j = blockStartRow; j < blockEndRow; j++) {
                            cellWidths[j][c] = maxWidth;
                        }
                        startingNewBlock = true;
                    }

                    maxWidth = Math.max(maxWidth, width);
                }
            }

            return cellWidths;
        };

        this.$rightmostSelectionInCell = function (selectionColumns, cellRightEdge) {
            var rightmost = 0;

            if (selectionColumns.length) {
                var lengths = [];
                for (var s = 0, length = selectionColumns.length; s < length; s++) {
                    if (selectionColumns[s] <= cellRightEdge) lengths.push(s);else lengths.push(0);
                }
                rightmost = Math.max.apply(Math, lengths);
            }

            return rightmost;
        };

        this.$tabsForRow = function (row) {
            var rowTabs = [],
                line = this.$editor.session.getLine(row),
                re = /\t/g,
                match;

            while ((match = re.exec(line)) != null) {
                rowTabs.push(match.index);
            }

            return rowTabs;
        };

        this.$adjustRow = function (row, widths) {
            var rowTabs = this.$tabsForRow(row);

            if (rowTabs.length == 0) return;

            var bias = 0,
                location = -1;
            var expandedSet = this.$izip(widths, rowTabs);

            for (var i = 0, l = expandedSet.length; i < l; i++) {
                var w = expandedSet[i][0],
                    it = expandedSet[i][1];
                location += 1 + w;
                it += bias;
                var difference = location - it;

                if (difference == 0) continue;

                var partialLine = this.$editor.session.getLine(row).substr(0, it);
                var strippedPartialLine = partialLine.replace(/\s*$/g, "");
                var ispaces = partialLine.length - strippedPartialLine.length;

                if (difference > 0) {
                    this.$editor.session.getDocument().insertInLine({ row: row, column: it + 1 }, Array(difference + 1).join(" ") + "\t");
                    this.$editor.session.getDocument().removeInLine(row, it, it + 1);

                    bias += difference;
                }

                if (difference < 0 && ispaces >= -difference) {
                    this.$editor.session.getDocument().removeInLine(row, it + difference, it);
                    bias += difference;
                }
            }
        };
        this.$izip_longest = function (iterables) {
            if (!iterables[0]) return [];
            var longest = iterables[0].length;
            var iterablesLength = iterables.length;

            for (var i = 1; i < iterablesLength; i++) {
                var iLength = iterables[i].length;
                if (iLength > longest) longest = iLength;
            }

            var expandedSet = [];

            for (var l = 0; l < longest; l++) {
                var set = [];
                for (var i = 0; i < iterablesLength; i++) {
                    if (iterables[i][l] === "") set.push(NaN);else set.push(iterables[i][l]);
                }

                expandedSet.push(set);
            }

            return expandedSet;
        };
        this.$izip = function (widths, tabs) {
            var size = widths.length >= tabs.length ? tabs.length : widths.length;

            var expandedSet = [];
            for (var i = 0; i < size; i++) {
                var set = [widths[i], tabs[i]];
                expandedSet.push(set);
            }
            return expandedSet;
        };
    }).call(ElasticTabstopsLite.prototype);

    exports.ElasticTabstopsLite = ElasticTabstopsLite;

    var Editor = require("../editor").Editor;
    require("../config").defineOptions(Editor.prototype, "editor", {
        useElasticTabstops: {
            set: function set(val) {
                if (val) {
                    if (!this.elasticTabstops) this.elasticTabstops = new ElasticTabstopsLite(this);
                    this.commands.on("afterExec", this.elasticTabstops.onAfterExec);
                    this.commands.on("exec", this.elasticTabstops.onExec);
                    this.on("change", this.elasticTabstops.onChange);
                } else if (this.elasticTabstops) {
                    this.commands.removeListener("afterExec", this.elasticTabstops.onAfterExec);
                    this.commands.removeListener("exec", this.elasticTabstops.onExec);
                    this.removeListener("change", this.elasticTabstops.onChange);
                }
            }
        }
    });
});
(function () {
    ace.require(["ace/ext/elastic_tabstops_lite"], function () {});
})();