import {module} from '../module';
import Component from '../lib/component';
import Flatpickr from 'vendor/src/flatpickr';
import './style.scss';

// equivalences to format date between flatpicker and angularjs
export const formatEquivalence = {
    d: 'dd', // Day of the month, 2 digits with leading zeros (01 to 31)
    j: 'd', // Day of the month without leading zeros (1 to 31)
    m: 'MM', // Month in year, padded (01-12)
    n: 'M', // Month in year (1-12)
    y: 'yy', // A two digit representation of a year	(00-99)
    Y: 'yyyy', // A full numeric representation of a year, 4 digits	(1999 or 2003)
    H: 'HH', // Hour in AM/PM, padded (01-12)
    h: 'H', // Hour in AM/PM, (1-12)
    i: 'mm', // Minutes	(00 to 59)
    s: 'ss' // Seconds	(00 to 59)
};

class DatePicker extends Component {
    constructor($element, $translate, $filter, $timeout, $attrs) {
        super($element);
        this.input = $element[0].querySelector('input');
        this.$translate = $translate;
        this.$filter = $filter;
        this.$timeout = $timeout;
        this.$attrs = $attrs;

        this.enabled = true;
        this._modelView = null;
        this._model = undefined;
        this._optionsChecked = false;
        this._waitingInit = 0;
        this.hasFocus = false;
        this.hasMouseIn = false;
        componentHandler.upgradeElement($element[0].firstChild);
    }

    get model() {
        return this._model;
    }
    set model(value) {
        if (this._optionsChecked) {
            this._waitingInit = 0;
            this._model = value;
            if (value && !this.modelView) {
                let initialDateFormat = this.$translate.use() === 'es' ? 'd-m-Y' : 'Y-m-d';
                if (this.iniOptions.enableTime) {
                    initialDateFormat += ' H:i:s';
                }
                let format = this._formatFlat2Angular(initialDateFormat);
                this._modelView = this.$filter('date')(new Date(value), format);
                this.mdlUpdate();
            }
        } else if (this._waitingInit < 4) {
            this._waitingInit++;
            this.$timeout(() => {
                this.model = value;
            }, 250);
        } else {
            this.model = null;
            this.modelView = '';
            this._waitingInit = 0;
        }
    }
    get modelView() {
        return this._modelView;
    }
    set modelView(value) {
        this._modelView = value;
        this.input.value = value;
        this._setModel(value);
        this.mdlUpdate();
    }

    onClear() {
        this.modelView = null;
    }
    onClick() {
        if (this.vp) {
            this.vp.open();
        }
    }
    mdlUpdate() {
        this.$timeout(() => {
            let mdlField = this.element.firstChild.MaterialTextfield;
            if (mdlField)
                mdlField.updateClasses_();
        }, 500);
    }

    _formatFlat2Angular(string) { // change string Flatpickr format to angular format (d-m-Y  -> dd-MM-yyyy)
        let aux = string.split(/[ZT.,/ :-]/);
        let parts = [];
        aux.forEach(
            val => {
                parts.push(formatEquivalence[val]);
            }
        );
        if (string.indexOf(' ') !== -1 || string.indexOf('T') !== -1) { // datetime format
            let dates = parts.slice(0, 3).join('-');
            let hours = parts.slice(3, parts.length).join(':');
            return `${dates} ${hours}`.trim();
        } else if (string.indexOf(':') !== -1) { // only time format
            return parts.join(':');
        } // only date format
        return parts.join('-');
    }

    _setModel(value) {
        let model;
        if (!value) {
            model = undefined;
        } else if (!this.iniOptions || (this.iniOptions.dateFormat && this.iniOptions.dateFormat.startsWith('Y-m-d'))) {
            model = value;
        } else {
            let formats = this.iniOptions.dateFormat.split(/[ZT.,/ :-]/);
            let aux = value.split(/[ZT.,/ :-]/);
            let date = {};
            formats.forEach(
                (k, i) => {
                    if (k.toLowerCase() === 'y') {
                        date.year = aux[i];
                    } else if (k === 'm' || k === 'n') {
                        date.month = aux[i];
                    } else if (k === 'd' || k === 'j') {
                        date.day = aux[i];
                    } else if (k.toLowerCase() === 'h') {
                        date.hour = aux[i];
                    } else if (k === 'i') {
                        date.minutes = aux[i];
                    } else if (k === 's') {
                        date.seccons = aux[i];
                    }
                }
            );

            let dateStr = '';
            let hourStr = '';

            if (date.year && date.month && date.day) {
                dateStr = `${date.year}-${date.month}-${date.day}`;
            }
            if (date.hour) {
                hourStr = date.hour;
                if (date.minutes) {
                    hourStr += ':' + date.minutes;
                } else {
                    hourStr += ':00';
                }
                if (date.seccons) {
                    hourStr += ':' + date.seccons;
                } else {
                    hourStr += ':00';
                }
            }
            model = `${dateStr} ${hourStr}`.trim();
        }

        if (this.model !== model) {
            this.model = model;
        }
    }

    _getOptions() {
        if (this.iniOptions && this._optionsChecked) {
            return this.iniOptions;
        } else if (!this.iniOptions) {
            this.iniOptions = {};
        }

        if (!this.iniOptions.locale)
            this.iniOptions.locale = this.$translate.use();

        if (!this.iniOptions.dateFormat)
            this.iniOptions.dateFormat = this.iniOptions.locale === 'es' ? 'd-m-Y' : 'm-d-Y';
        else if (this.iniOptions.dateFormat) {
            let format = this.iniOptions.dateFormat.split(/[ZT.,/ :-]/);
            if (format.length <= 1) {
                throw new Error(`Error: Invalid string format ${format}`);
            }
            format.forEach(
                val => {
                    if (!formatEquivalence[val]) {
                        throw new Error(`Error in dateFormat ${this.iniOptions.dateFormat}: is not like Flatpickr Formatting Token https://chmln.github.io/flatpickr/formatting/`);
                    }
                }
            );
        }

        if (this.$attrs.hasOwnProperty('today')) {
            this.iniOptions.defaultDate = new Date();
        }

        this._optionsChecked = true;
        return this.iniOptions;
    }

    initPicker() {
        this.iniOptions = this._getOptions();
        this.isTimePicker = (this.iniOptions && this.iniOptions.enableTime && this.iniOptions.noCalendar);
        this.vp = new Flatpickr(this.input, this.iniOptions);
        if (this.iniOptions.defaultDate) {
            this.modelView = this.vp.formatDate(this.iniOptions.defaultDate, this.iniOptions.dateFormat);
        }
    }
    destroyPicker() {
        if (this.vp)
            this.vp.destroy();
        this.vp = undefined;
    }

    $onChanges(objChange) {
        if (objChange.iniOptions && objChange.iniOptions.currentValue) {
            this.iniOptions = Object.assign(this.iniOptions, objChange.iniOptions.currentValue);
        }
    }

    $onInit() {
        this.initPicker();
    }

    $onDestroy() {
        this.destroyPicker();
    }
}
DatePicker.$inject = ['$element', '$translate', '$filter', '$timeout', '$attrs'];

module.component('vnDatePicker', {
    template: require('./datePicker.html'),
    bindings: {
        model: '=',
        label: '@?',
        name: '@?',
        enabled: '<?',
        rule: '<?',
        iniOptions: '<?'
    },
    controller: DatePicker
});