import {module} from '../module';
import Component from '../lib/component';
import './style.scss';

class Autocomplete extends Component {
    constructor($element, $scope, $http, $timeout) {
        super($element);
        this.$element = $element;
        this.$scope = $scope;
        this.$http = $http;
        this.$timeout = $timeout;

        this._showDropDown = false;
        this.finding = false;
        this.findMore = false;
        this._value = null;
        this._field = null;
        this._preLoad = false;
        this.maxRow = 10;
        this.showField = this.showField || 'name';
        this.valueField = this.valueField || 'id';
        this.order = this.order || 'name ASC';
        this.items = this.data || [];
        this.displayValueMultiCheck = [];
        this._multiField = [];
        this.readonly = true;
        this.removeLoadMore = false;
    }

    get showDropDown() {
        return this._showDropDown;
    }
    set showDropDown(value) {
        if (value && this.url && !this._preLoad) {
            this._preLoad = true;
            this.getItems();
        }
        if (value && !this.width) {
            let rectangle = this.$element[0].getBoundingClientRect();
            this.width = Math.round(rectangle.width) - 10;
        }
        this._showDropDown = value;
    }

    get displayValue() {
        return this._value;
    }

    set displayValue(value) {
        let val = (value === undefined || value === '') ? null : value;
        if (this.multiple && val) {
            let index = this.displayValueMultiCheck.indexOf(val);
            if (index === -1)
                this.displayValueMultiCheck.push(val);
            else
                this.displayValueMultiCheck.splice(index, 1);

            this._value = this.displayValueMultiCheck.join(', ');
        } else {
            this._value = val;
        }

        if (value === null) {
            this.field = null;
            if (this.multiple && this.items.length) {
                this.displayValueMultiCheck = [];
                this.items.map(item => {
                    item.checked = false;
                    return item;
                });
            }
        }
    }

    get field() {
        return this.multiple ? this._multiField : this._field;
    }
    set field(value) {
        if (!angular.equals(value, this.field)) {
            this.finding = true;
            if (value && value.hasOwnProperty(this.valueField)) {
                this._field = value[this.valueField];
                if (this.multiple) {
                    this.setMultiField(value[this.valueField]);
                }
            } else {
                this.setValue(value);
            }

            if (value && value.hasOwnProperty(this.showField))
                this.displayValue = value[this.showField];

            this.finding = false;

            if (this.onChange)
                this.onChange({item: this._field});
        }
    }

    set initialData(value) {
        if (value && value.hasOwnProperty(this.valueField)) {
            this._field = value[this.valueField];
            if (this.multiple) {
                this._multiField = [value[this.valueField]]
            }
            if (value.hasOwnProperty(this.showField)) {
                this.displayValue = value[this.showField];
            }
        }
    }

    setMultiField(val) {
        if (val && typeof val === 'object' && val[this.valueField]) {
            val = val[this.valueField];
        }
        if (val === null) {
            this._multiField = [];
        } else {
            let index = this._multiField.indexOf(val);
            if (index === -1) {
                this._multiField.push(val);
            } else {
                this._multiField.splice(index, 1);
            }
        }
    }

    setValue(value) {
        if (value) {
            let data = this.items;

            if (data && data.length)
                for (let i = 0; i < data.length; i++)
                    if (data[i][this.valueField] === value) {
                        this.showItem(data[i]);
                        return;
                    }

            this.requestItem(value);
        } else {
            this._field = null;
            this.setMultiField(null);
            this.displayValue = '';
        }
    }

    requestItem(value) {
        if (!value) return;

        let where = {};
        where[this.valueField] = value;

        let filter = {
            fields: this.getRequestFields(),
            where: where
        };

        let json = JSON.stringify(filter);

        this.$http.get(`${this.url}?filter=${json}`).then(
            json => this.onItemRequest(json.data),
            json => this.onItemRequest(null)
        );
    }
    onItemRequest(data) {
        if (data && data.length > 0)
            this.showItem(data[0]);
        else
            this.showItem(null);
    }

    showItem(item) {
        this.displayValue = item ? item[this.showField] : '';
        this.field = item;
    }

    getRequestFields() {
        let fields = {};
        fields[this.valueField] = true;
        fields[this.showField] = true;

        if (this._selectFields)
            for (let field of this._selectFields)
                fields[field] = true;

        return fields;
    }

    findItems(search) {
        if (!this.url)
            return this.items ? this.items : [];

        if (search && !this.finding) {
            this.maxRow = false;
            let filter = {where: {name: {regexp: search}}};
            if (this.filter && this.filter.where) {
                Object.assign(filter.where, this.filter.where);
            }
            let json = JSON.stringify(filter);
            this.finding = true;
            this.$http.get(`${this.url}?filter=${json}`).then(
                json => {
                    this.items = [];
                    json.data.forEach(
                        el => {
                            if (this.multiple) {
                                el.checked = this.field.indexOf(el[this.valueField]) !== -1;
                            }
                            this.items.push(el);
                        }
                    );
                    this.finding = false;
                },
                () => {
                    this.finding = false;
                }
            );
        } else if (!search && !this.finding) {
            this.maxRow = 10;
            this.items = [];
            this.getItems();
        }
    }
    getItems() {
        let filter = {};
        if (!this.finding) {
            this.finding = true;

            if (this.maxRow) {
                if (this.items) {
                    filter.skip = this.items.length;
                }
                filter.limit = this.maxRow;
                filter.order = this.order;
            }
            if (this.filter) {
                Object.assign(filter, this.filter);
            }

            let json = JSON.stringify(filter);

            this.removeLoadMore = false;

            this.$http.get(`${this.url}?filter=${json}`).then(
                json => {
                    if (json.data.length) {
                        json.data.forEach(
                            el => {
                                if (this.multiple) {
                                    el.checked = this.field.indexOf(el[this.valueField]) !== -1;
                                }
                                this.items.push(el);
                            }
                        );
                        if (filter.skip === 0 && this.maxRow && json.data.length < this.maxRow) {
                            this.removeLoadMore = true;
                        }
                    } else {
                        this.maxRow = false;
                    }
                    this.finding = false;
                },
                () => {
                    this.finding = false;
                }
            );
        }
    }
    $onInit() {
        this.findMore = this.url && this.maxRow;
        this.mouseFocus = false;
        this.focused = false;

        this.$element.bind('mouseover', e => {
            this.$timeout(() => {
                this.mouseFocus = true;
                this.showDropDown = this.focused;
            });
        });

        this.$element.bind('mouseout', () => {
            this.$timeout(() => {
                this.mouseFocus = false;
                this.showDropDown = this.focused;
            });
        });
        this.$element.bind('focusin', e => {
            this.$timeout(() => {
                this.focused = true;
                this.showDropDown = true;
            });
        });
        this.$element.bind('focusout', e => {
            this.$timeout(() => {
                this.focused = false;
                this.showDropDown = this.mouseFocus;
            });
        });
    }

    $onDestroy() {
        this.$element.unbind('mouseover');
        this.$element.unbind('mouseout');
        this.$element.unbind('focusin');
        this.$element.unbind('focusout');
    }

}

Autocomplete.$inject = ['$element', '$scope', '$http', '$timeout'];

module.component('vnAutocomplete', {
    template: require('./autocomplete.html'),
    controller: Autocomplete,
    bindings: {
        url: '@?',
        showField: '@?',
        valueField: '@?',
        selectFields: '@?',
        initialData: '<?',
        onChange: '&?',
        data: '<?',
        field: '=',
        label: '@',
        multiple: '@?',
        order: '@?',
        filter: '<?'
    },
    transclude: {
        tplItem: '?tplItem'
    }
});