/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2015 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
 * Website: http://www.espocrm.com
 *
 * EspoCRM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/
Espo.define('views/fields/duration', 'views/fields/enum', function (Dep) {

    return Dep.extend({

        type: 'duration',

        listTemplate: 'fields/base/detail',

        detailTemplate: 'fields/base/detail',

        editTemplate: 'fields/duration/edit',

        data: function () {
            return _.extend({
                durationOptions: this.durationOptions,
            }, Dep.prototype.data.call(this));
        },

        calculateSeconds: function () {
            this.seconds = 0;
            var start = this.model.get(this.startField);
            var end = this.model.get(this.endField);
            if (this.mode == 'edit' || this.mode == 'detail') {
                this.seconds = this.model.getFieldParam(this.name, 'default') || 0;
            }

            if (start && end) {
                this.seconds = moment(this.model.get(this.endField)).unix() - moment(this.model.get(this.startField)).unix();
            } else {
                if (start) {
                    var end = this._getDateEnd();
                    this.model.set(this.endField, end, {silent: true});
                }
            }
        },

        init: function () {
            Dep.prototype.init.call(this);

            this.listenTo(this, 'render', function () {

                this.calculateSeconds();

                var durationOptions = '';
                var options = this.defaultOptions = _.clone(this.model.getFieldParam(this.name, 'options'));

                if (options.indexOf(this.seconds) == -1) {
                    options.push(this.seconds);
                }
                options.sort(function (a, b) {
                    return a - b;
                });

                options.forEach(function (d) {
                    durationOptions += '<option value="' + d + '" ' + (d == this.seconds ? 'selected' : '') +'>' + this.stringifyDuration(d) + '</option>';
                }.bind(this));
                this.durationOptions = durationOptions;
                this.stringValue = this.stringifyDuration(this.seconds);
            }.bind(this));
        },

        setup: function () {
            this.startField = this.model.getFieldParam(this.name, 'start');
            this.endField = this.model.getFieldParam(this.name, 'end');
            if (!this.startField || !this.endField) {
                throw new Error('Bad definition for field \'' + this.name + '\'.');
            }
            this.calculateSeconds();
        },

        getValueForDisplay: function () {
            return this.stringValue;
        },

        stringifyDuration: function (seconds) {
            if (!seconds) {
                return '';
            }
            var d = seconds;
            var days = Math.floor(d / (86400));
            d = d % (86400);
            var hours = Math.floor(d / (3600));
            d = d % (3600);
            var minutes = Math.floor(d / (60));

            var parts = [];
            if (days) {
                parts.push(days + '' + this.getLanguage().translate('d'));
            }
            if (hours) {
                parts.push(hours + '' + this.getLanguage().translate('h'));
            }
            if (minutes) {
                parts.push(minutes + '' + this.getLanguage().translate('m'));
            }
            return parts.join(' ');
        },

        afterRender: function () {
            var parentView = this.getParentView();
            if (parentView && 'getView' in parentView) {
                this.startFieldView = parentView.getView(this.startField);
                this.endFieldView = parentView.getView(this.endField);
            }

            if (this.mode == 'edit') {
                this.$duration = this.$el.find('[name="' + this.name + '"]');
                this.$duration.on('change', function () {
                    this.seconds = parseInt(this.$duration.val());
                    this.updateDateEnd();
                    this.$duration.find('option.custom').remove();
                }.bind(this));
            }

            this.stopListening(this.model, 'change:' + this.endField);
            this.stopListening(this.model, 'change:' + this.endField);

            this.listenTo(this.model, 'change:' + this.endField, function () {
                var start = this.model.get(this.startField);
                var end = this.model.get(this.endField);

                if (!end || !start) {
                    return;
                }

                this.seconds = moment(end).unix() - moment(start).unix();
                this.updateDuration();
            }.bind(this));

            this.listenTo(this.model, 'change:' + this.startField, this.updateDateEnd);

            if (this.mode == 'edit') {
                var start = this.model.get(this.startField);
                var end = this.model.get(this.endField);
                var seconds = this.$duration.val();

                if (!end && start && seconds) {
                    if (this.endFieldView) {
                        if (this.endFieldView.isRendered()) {
                            this.updateDateEnd();
                        } else {
                            this.endFieldView.once('after:render', function () {
                                this.updateDateEnd();
                            }.bind(this));
                        }
                    }
                }
            }
        },

        _getDateEnd: function () {
            var seconds = this.seconds;
            var start = this.model.get(this.startField);

            if (!start) {
                return;
            }

            var endUnix;
            var end;
            if (seconds) {
                endUnix = moment.utc(start).unix() + seconds;
                end = moment.unix(endUnix).utc().format(this.getDateTime().internalDateTimeFormat);
            } else {
                end = start;
            }
            return end;
        },

        updateDateEnd: function () {
            var end = this._getDateEnd();

            setTimeout(function () {
                this.model.set(this.endField, end);
            }.bind(this), 1);
        },

        updateDuration: function () {
            var seconds = this.seconds;

            if (seconds <= 0) {
                if (this.mode == 'edit') {
                    this.$duration.val('');
                } else {
                    this.setup();
                    this.render();
                }
            } else {
                if (this.mode == 'edit') {
                    this.$duration.find('option.custom').remove();
                    var $o = $('<option>').val(seconds).text(this.stringifyDuration(seconds)).addClass('custom');
                        var $found = this.$duration.find('option').filter(function (i, el) {
                        return $(el).val() >= seconds;
                    }).first();

                    if ($found.size()) {
                        if ($found.val() != seconds) {
                            $o.insertBefore($found);
                        };
                    } else {
                        $o.appendTo(this.$duration);
                    }
                    this.$duration.val(seconds);
                } else {
                    this.setup();
                    this.render();
                }
            }
        },

        fetch: function () {
            return {};
        },
    });
});

