/**
 * @copyright Copyright (c) 2016 Morris Jobke <hey@morrisjobke.de>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

(function() {
    Handlebars.registerHelper('selectItem', function(currentValue, itemValue) {
        if (currentValue === itemValue) {
            return 'selected="selected"';
        }

        return "";
    });

    Handlebars.registerHelper('getOperators', function(classname) {
        var check = OCA.WorkflowEngine.getCheckByClass(classname);
        if (!_.isUndefined(check)) {
            return check['operators'];
        }
        return [];
    });

    OCA.WorkflowEngine = _.extend(OCA.WorkflowEngine || {}, {
        availablePlugins: [],
        availableChecks: [],

        getCheckByClass: function(className) {
            var length = OCA.WorkflowEngine.availableChecks.length;
            for (var i = 0; i < length; i++) {
                if (OCA.WorkflowEngine.availableChecks[i]['class'] === className) {
                    return OCA.WorkflowEngine.availableChecks[i];
                }
            }
            return undefined;
        }
    });

    /**
     * 888b     d888               888          888
     * 8888b   d8888               888          888
     * 88888b.d88888               888          888
     * 888Y88888P888  .d88b.   .d88888  .d88b.  888 .d8888b
     * 888 Y888P 888 d88""88b d88" 888 d8P  Y8b 888 88K
     * 888  Y8P  888 888  888 888  888 88888888 888 "Y8888b.
     * 888   "   888 Y88..88P Y88b 888 Y8b.     888      X88
     * 888       888  "Y88P"   "Y88888  "Y8888  888  88888P'
     */

    /**
     * @class OCA.WorkflowEngine.Operation
     */
    OCA.WorkflowEngine.Operation =
        OC.Backbone.Model.extend({
            defaults: {
                'class': 'OCA\\WorkflowEngine\\Operation',
                'name': '',
                'checks': [],
                'operation': ''
            }
        });

    /**
     *  .d8888b.           888 888                   888    d8b
     * d88P  Y88b          888 888                   888    Y8P
     * 888    888          888 888                   888
     * 888         .d88b.  888 888  .d88b.   .d8888b 888888 888  .d88b.  88888b.  .d8888b
     * 888        d88""88b 888 888 d8P  Y8b d88P"    888    888 d88""88b 888 "88b 88K
     * 888    888 888  888 888 888 88888888 888      888    888 888  888 888  888 "Y8888b.
     * Y88b  d88P Y88..88P 888 888 Y8b.     Y88b.    Y88b.  888 Y88..88P 888  888      X88
     *  "Y8888P"   "Y88P"  888 888  "Y8888   "Y8888P  "Y888 888  "Y88P"  888  888  88888P'
     */

    /**
     * @class OCA.WorkflowEngine.OperationsCollection
     *
     * collection for all configurated operations
     */
    OCA.WorkflowEngine.OperationsCollection =
        OC.Backbone.Collection.extend({
            model: OCA.WorkflowEngine.Operation,
            url: OC.generateUrl('apps/workflowengine/operations')
        });

    /**
     * 888     888 d8b
     * 888     888 Y8P
     * 888     888
     * Y88b   d88P 888  .d88b.  888  888  888 .d8888b
     *  Y88b d88P  888 d8P  Y8b 888  888  888 88K
     *   Y88o88P   888 88888888 888  888  888 "Y8888b.
     *    Y888P    888 Y8b.     Y88b 888 d88P      X88
     *     Y8P     888  "Y8888   "Y8888888P"   88888P'
     */

    /**
     * @class OCA.WorkflowEngine.TemplateView
     *
     * a generic template that handles the Handlebars template compile step
     * in a method called "template()"
     */
    OCA.WorkflowEngine.TemplateView =
        OC.Backbone.View.extend({
            _template: null,
            template: function(vars) {
                if (!this._template) {
                    this._template = Handlebars.compile($(this.templateId).html());
                }
                return this._template(vars);
            }
        });

    /**
     * @class OCA.WorkflowEngine.OperationView
     *
     * this creates the view for a single operation
     */
    OCA.WorkflowEngine.OperationView =
        OCA.WorkflowEngine.TemplateView.extend({
            templateId: '#operation-template',
            events: {
                'change .check-class': 'checkChanged',
                'change .check-operator': 'checkChanged',
                'change .check-value': 'checkChanged',
                'change .operation-name': 'operationChanged',
                'change .operation-operation': 'operationChanged',
                'click .button-reset': 'reset',
                'click .button-save': 'save',
                'click .button-add': 'add',
                'click .button-delete': 'delete',
                'click .button-delete-check': 'deleteCheck'
            },
            originalModel: null,
            hasChanged: false,
            message: '',
            errorMessage: '',
            saving: false,
            groups: [],
            initialize: function() {
                // this creates a new copy of the object to definitely have a new reference and being able to reset the model
                this.originalModel = JSON.parse(JSON.stringify(this.model));
                this.model.on('change', function() {
                    console.log('model changed');
                    this.hasChanged = true;
                    this.render();
                }, this);

                if (this.model.get('id') === undefined) {
                    this.hasChanged = true;
                }
                var self = this;
                $.ajax({
                    url: OC.linkToOCS('cloud/groups', 2) + 'details',
                    dataType: 'json',
                    quietMillis: 100,
                }).success(function(data) {
                    if (data.ocs.data.groups && data.ocs.data.groups.length > 0) {

                        data.ocs.data.groups.forEach(function(group) {
                            self.groups.push({ id: group.id, displayname: group.displayname });
                        });
                        self.render();

                    } else {
                        OC.Notification.error(t('workflowengine', 'Group list is empty'), { type: 'error' });
                        console.log(data);
                    }
                }).error(function(data) {
                    OC.Notification.error(t('workflowengine', 'Unable to retrieve the group list'), { type: 'error' });
                    console.log(data);
                });
            },
            delete: function() {
                if (OC.PasswordConfirmation.requiresPasswordConfirmation()) {
                    OC.PasswordConfirmation.requirePasswordConfirmation(_.bind(this.delete, this));
                    return;
                }

                this.model.destroy();
                this.remove();
            },
            reset: function() {
                this.hasChanged = false;
                // silent is need to not trigger the change event which resets the hasChanged attribute
                this.model.set(this.originalModel, { silent: true });
                this.render();
            },
            save: function() {
                if (OC.PasswordConfirmation.requiresPasswordConfirmation()) {
                    OC.PasswordConfirmation.requirePasswordConfirmation(_.bind(this.save, this));
                    return;
                }

                var success = function(model, response, options) {
                    this.saving = false;
                    this.originalModel = JSON.parse(JSON.stringify(this.model));

                    this.message = t('workflowengine', 'Saved');
                    this.errorMessage = '';
                    this.render();
                };
                var error = function(model, response, options) {
                    this.saving = false;
                    this.hasChanged = true;

                    this.message = t('workflowengine', 'Saving failed:');
                    this.errorMessage = response.responseText;
                    this.render();
                };
                this.hasChanged = false;
                this.saving = true;
                this.render();
                this.model.save(null, { success: success, error: error, context: this });
            },
            add: function() {
                var checks = _.clone(this.model.get('checks')),
                    classname = OCA.WorkflowEngine.availableChecks[0]['class'],
                    operators = OCA.WorkflowEngine.availableChecks[0]['operators'];

                checks.push({
                    'class': classname,
                    'operator': operators[0]['operator'],
                    'value': ''
                });
                this.model.set({ 'checks': checks });
            },
            checkChanged: function(event) {
                var value = event.target.value,
                    id = $(event.target.parentElement).data('id'),
                    // this creates a new copy of the object to definitely have a new reference
                    checks = JSON.parse(JSON.stringify(this.model.get('checks'))),
                    key = null;

                for (var i = 0; i < event.target.classList.length; i++) {
                    var className = event.target.classList[i];
                    if (className.substr(0, 'check-'.length) === 'check-') {
                        key = className.substr('check-'.length);
                        break;
                    }
                }

                if (key === null) {
                    console.warn('checkChanged triggered but element doesn\'t have any "check-" class');
                    return;
                }

                if (!_.has(checks[id], key)) {
                    console.warn('key "' + key + '" is not available in check', check);
                    return;
                }

                checks[id][key] = value;
                // if the class is changed most likely also the operators have changed
                // with this we set the operator to the first possible operator
                if (key === 'class') {
                    var check = OCA.WorkflowEngine.getCheckByClass(value);
                    if (!_.isUndefined(check)) {
                        checks[id]['operator'] = check['operators'][0]['operator'];
                    }
                }
                // model change will trigger render
                this.model.set({ 'checks': checks });
            },
            deleteCheck: function(event) {
                console.log(arguments);
                var id = $(event.target.parentElement).data('id'),
                    checks = JSON.parse(JSON.stringify(this.model.get('checks')));

                // splice removes 1 element at index `id`
                checks.splice(id, 1);
                // model change will trigger render
                this.model.set({ 'checks': checks });
            },
            operationChanged: function(event) {
                var value = event.target.value,
                    key = null;

                for (var i = 0; i < event.target.classList.length; i++) {
                    var className = event.target.classList[i];
                    if (className.substr(0, 'operation-'.length) === 'operation-') {
                        key = className.substr('operation-'.length);
                        break;
                    }
                }

                if (key === null) {
                    console.warn('operationChanged triggered but element doesn\'t have any "operation-" class');
                    return;
                }

                if (key !== 'name' && key !== 'operation') {
                    console.warn('key "' + key + '" is no valid attribute');
                    return;
                }

                // model change will trigger render
                this.model.set(key, value);
            },
            render: function() {
                this.$el.html(this.template({
                    operation: this.model.toJSON(),
                    classes: OCA.WorkflowEngine.availableChecks,
                    hasChanged: this.hasChanged,
                    message: this.message,
                    errorMessage: this.errorMessage,
                    saving: this.saving
                }));

                var checks = this.model.get('checks');
                _.each(this.$el.find('.check'), function(element) {
                    var $element = $(element),
                        id = $element.data('id'),
                        check = checks[id],
                        valueElement = $element.find('.check-value').first();
                    var self = this;

                    _.each(OCA.WorkflowEngine.availablePlugins, function(plugin) {
                        if (_.isFunction(plugin.render)) {
                            plugin.render(valueElement, check, self.groups);
                        }
                    });
                }, this);

                if (this.message !== '') {
                    // hide success messages after some time
                    _.delay(function(elements) {
                        $(elements).css('opacity', 0);
                    }, 7000, this.$el.find('.msg.success'));
                    this.message = '';
                }

                return this.$el;
            }
        });

    /**
     * @class OCA.WorkflowEngine.OperationsView
     *
     * this creates the view for configured operations
     */
    OCA.WorkflowEngine.OperationsView =
        OCA.WorkflowEngine.TemplateView.extend({
            templateId: '#operations-template',
            collection: null,
            $el: null,
            events: {
                'click .button-add-operation': 'add'
            },
            initialize: function(classname) {
                if (!OCA.WorkflowEngine.availablePlugins.length) {
                    OCA.WorkflowEngine.availablePlugins = OC.Plugins.getPlugins('OCA.WorkflowEngine.CheckPlugins');
                    _.each(OCA.WorkflowEngine.availablePlugins, function(plugin) {
                        if (_.isFunction(plugin.getCheck)) {
                            OCA.WorkflowEngine.availableChecks.push(plugin.getCheck(classname));
                        }
                    });
                }

                this.collection.fetch({
                    data: {
                        'class': classname
                    }
                });
                this.collection.once('sync', this.render, this);
            },
            add: function() {
                var operation = this.collection.create();
                this.renderOperation(operation);
            },
            renderOperation: function(subView) {
                var operationsElement = this.$el.find('.operations');
                operationsElement.append(subView.$el);
                subView.render();
            },
            render: function() {
                this.$el.html(this.template());
                this.collection.each(this.renderOperation, this);
            }
        });
})();