/*
 * Copyright 2015 Open Networking Laboratory
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 ONOS GUI -- Widget -- Table Service
 */
(function () {
    'use strict';

    // injected refs
    var $log, $window, fs, mast, is;

    // constants
    var tableIconTdSize = 33,
        pdg = 22,
        flashTime = 1500,
        colWidth = 'col-width',
        tableIcon = 'table-icon';

    // internal state
    var cstmWidths = {},
        api;

    // Functions for resizing a tabular view to the window

    function _width(elem, width) {
        elem.style('width', width);
    }

    function findCstmWidths(table) {
        var headers = table.select('.table-header').selectAll('td');

        headers.each(function (d, i) {
            var h = d3.select(this),
                index = i.toString();
            if (h.classed(tableIcon)) {
                cstmWidths[index] = tableIconTdSize + 'px';
            }
            if (h.attr(colWidth)) {
                cstmWidths[index] = h.attr(colWidth);
            }
        });
        if (fs.debugOn('widget')) {
            $log.debug('Headers with custom widths: ', cstmWidths);
        }
    }

    function setTdWidths(elem, width) {
        var tds = elem.select('tr:first-child').selectAll('td');
        _width(elem, width + 'px');

        tds.each(function (d, i) {
            var td = d3.select(this),
                index = i.toString();
            if (cstmWidths.hasOwnProperty(index)) {
                _width(td, cstmWidths[index]);
            }
        });
    }

    function setHeight(thead, body, height) {
        var h = height - (mast.mastHeight() +
            fs.noPxStyle(d3.select('.tabular-header'), 'height') +
            fs.noPxStyle(thead, 'height') + pdg);
        body.style('height', h + 'px');
    }

    function adjustTable(haveItems, tableElems, width, height) {
        if (haveItems) {
            setTdWidths(tableElems.thead, width);
            setTdWidths(tableElems.tbody, width);
            setHeight(tableElems.thead, tableElems.table.select('.table-body'), height);
        } else {
            setTdWidths(tableElems.thead, width);
            _width(tableElems.tbody, width + 'px');
        }
    }

    // sort columns state model and functions
    var sortState = {
        s: {
            first: null,
            second: null,
            touched: null
        },

        reset: function () {
            var s = sortState.s;
            s.first && api.none(s.first.adiv);
            s.second && api.none(s.second.adiv);
            sortState.s = { first: null, second: null, touched: null };
        },

        touch: function (id, adiv) {
            var s = sortState.s,
                s1 = s.first,
                d;

            if (!s.touched) {
                s.first = { id: id, dir: 'asc', adiv: adiv };
                s.touched = id;
            } else {
                if (id === s.touched) {
                    d = s1.dir === 'asc' ? 'desc' : 'asc';
                    s1.dir = d;
                    s1.adiv = adiv;

                } else {
                    s.second = s.first;
                    s.first = { id: id, dir: 'asc', adiv: adiv };
                    s.touched = id;
                }
            }
        },

        update: function () {
            var s = sortState.s,
                s1 = s.first,
                s2 = s.second;
            api[s1.dir](s1.adiv);
            s2 && api.none(s2.adiv);
        }
    };

    // Functions for sorting table rows by header

    function updateSortDirection(thElem) {
        var adiv = thElem.select('div'),
            id = thElem.attr('colId');

        api.none(adiv);
        adiv = thElem.append('div');
        sortState.touch(id, adiv);
        sortState.update();
    }

    function sortRequestParams() {
        var s = sortState.s,
            s1 = s.first,
            s2 = s.second,
            id2 = s2 && s2.id,
            dir2 = s2 && s2.dir;
        return {
            firstCol: s1.id,
            firstDir: s1.dir,
            secondCol: id2,
            secondDir: dir2
        };
    }

    angular.module('onosWidget')
    .directive('onosTableResize', ['$log','$window', 'FnService', 'MastService',

        function (_$log_, _$window_, _fs_, _mast_) {
        return function (scope, element) {
            $log = _$log_;
            $window = _$window_;
            fs = _fs_;
            mast = _mast_;

            var table = d3.select(element[0]),
                tableElems = {
                    table: table,
                    thead: table.select('.table-header').select('table'),
                    tbody: table.select('.table-body').select('table')
                },
                wsz;

            findCstmWidths(table);

            // adjust table on window resize
            scope.$watchCollection(function () {
                return {
                    h: $window.innerHeight,
                    w: $window.innerWidth
                };
            }, function () {
                wsz = fs.windowSize(0, 30);
                adjustTable(
                    scope.tableData.length,
                    tableElems,
                    wsz.width, wsz.height
                );
            });

            // adjust table when data changes
            scope.$watchCollection('tableData', function () {
                adjustTable(
                    scope.tableData.length,
                    tableElems,
                    wsz.width, wsz.height
                );
            });

            scope.$on('$destroy', function () {
                cstmWidths = {};
            });
        };
    }])

    .directive('onosSortableHeader', ['$log', 'IconService',
        function (_$log_, _is_) {
        return function (scope, element) {
            $log = _$log_;
            is = _is_;
            var header = d3.select(element[0]);

            api = is.sortIcons();

            header.selectAll('td').on('click', function () {
                var col = d3.select(this);

                if (col.attr('sortable') === '') {
                    updateSortDirection(col);
                    scope.sortParams = sortRequestParams();
                    scope.sortCallback(scope.sortParams);
                }
            });

            scope.$on('$destroy', function () {
                sortState.reset();
            });
        };
    }])

    .directive('onosFlashChanges',
        ['$log', '$parse', '$timeout', 'FnService',
        function ($log, $parse, $timeout, fs) {

        return function (scope, element, attrs) {
            var idProp = attrs.idProp,
                table = d3.select(element[0]),
                trs, promise;

            function highlightRows() {
                var changedRows = [];
                function classRows(b) {
                    if (changedRows.length) {
                        angular.forEach(changedRows, function (tr) {
                            tr.classed('data-change', b);
                        });
                    }
                }
                // timeout because 'row-id' was the un-interpolated value
                // "{{link.one}}" for example, instead of link.one evaluated
                // timeout executes on the next digest -- after evaluation
                $timeout(function () {
                    if (scope.tableData.length) {
                        trs = table.selectAll('tr');
                    }

                    if (trs && !trs.empty()) {
                        trs.each(function () {
                            var tr = d3.select(this);
                            if (fs.find(tr.attr('row-id'),
                                    scope.changedData,
                                    idProp) > -1) {
                                changedRows.push(tr);
                            }
                        });
                        classRows(true);
                        promise = $timeout(function () {
                            classRows(false);
                        }, flashTime);
                        trs = undefined;
                    }
                });
            }

            // new items added:
            scope.$on('ngRepeatComplete', highlightRows);
            // items changed in existing set:
            scope.$watchCollection('changedData', highlightRows);

            scope.$on('$destroy', function () {
                if (promise) {
                    $timeout.cancel(promise);
                }
            });
        };
    }]);

}());