// NG2
import { ElementRef, Component, EventEmitter, Input, Output, forwardRef, trigger, state, style, transition, animate } from '@angular/core';
import { NG_VALUE_ACCESSOR, ControlValueAccessor } from '@angular/forms';
// Vendor
import * as dateFns from 'date-fns';
// APP
import { Helpers } from '../../utils/Helpers';
import { NovoLabelService } from '../../services/novo-label-service';

// Value accessor for the component (supports ngModel)
const DATE_TIME_PICKER_VALUE_ACCESSOR = {
    provide: NG_VALUE_ACCESSOR,
    useExisting: forwardRef(() => NovoDateTimePickerElement),
    multi: true
};

@Component({
    selector: 'novo-date-time-picker',
    providers: [DATE_TIME_PICKER_VALUE_ACCESSOR],
    animations: [
        trigger('dateTextState', [
            state('date', style({
                'opacity': '1.0'
            })),
            state('time', style({
                'opacity': '0.6'
            })),
            transition('date <=> time', animate('200ms ease-in'))
        ]),
        trigger('timeTextState', [
            state('date', style({
                'opacity': '0.6'
            })),
            state('time', style({
                'opacity': '1.0'
            })),
            transition('date <=> time', animate('200ms ease-in'))
        ]),
        trigger('indicatorState', [
            state('date', style({
                'transform': 'translateX(0%)'
            })),
            state('time', style({
                'transform': 'translateX(100%)'
            })),
            transition('date <=> time', animate('200ms ease-in'))
        ]),
        trigger('containerState', [
            state('date', style({
                'transform': 'translateX(0%)'
            })),
            state('time', style({
                'transform': 'translateX(-100%)'
            })),
            transition('date <=> time', animate('200ms ease-in'))
        ])
    ],
    template: `
        <div class="date-time-container">
            <div class="date-time-tabs">
                <span class="date-tab" (click)="toggleView('date')" [@dateTextState]="componentTabState">{{selectedLabel}}</span>
                <span class="time-tab" (click)="toggleView('time')" [@timeTextState]="componentTabState">
                    <span class="hours" data-automation-id="novo-time-picker-hours">{{hours}}</span>:<span
                    class="minutes" data-automation-id="novo-time-picker-minutes">{{minutes}}</span>
                    <span *ngIf="!military" class="meridian">{{meridian}}</span>
                </span>
                <i class="date-time-indicator" [@indicatorState]="componentTabState"></i>
            </div>
            <div class="view-container" [@containerState]="componentTabState">
                <div class="calendar">
                    <novo-date-picker (onSelect)="onDateSelected($event)" [(ngModel)]="model" inline="true" [minYear]="minYear" [maxYear]="maxYear" [start]="start" [end]="end"></novo-date-picker>
                </div>
                <div class="time-picker">
                    <novo-time-picker (onSelect)="onTimeSelected($event)" [(ngModel)]="model" [military]="military" inline="true"></novo-time-picker>
                </div>
            </div>
        </div>
    `
})
export class NovoDateTimePickerElement implements ControlValueAccessor {
    @Input() minYear: any;
    @Input() maxYear: any;
    @Input() start: any;
    @Input() end: any;
    @Input() military: any;

    // Select callback for output
    @Output() onSelect: EventEmitter<any> = new EventEmitter(false);

    componentTabState: string = 'date';
    selectedLabel: string;
    hours: string;
    minutes: string;
    meridian: string;
    datePickerValue: Date = new Date();
    timePickerValue: Date = new Date();

    model: any;
    onModelChange: Function = () => { };
    onModelTouched: Function = () => { };

    constructor(public labels: NovoLabelService, private element: ElementRef) { }

    toggleView(tab: string): void {
        this.componentTabState = tab;
    }

    setDateLabels(value: Date) {
        this.selectedLabel = this.labels.formatDateWithFormat(value, {
            month: 'short',
            day: '2-digit',
            year: 'numeric'
        });
    }

    setTimeLabels(value: Date) {
        let hours = value.getHours();
        let minutes = value.getMinutes();

        this.meridian = value.toLocaleTimeString().slice(-2);

        if (!this.military) {
            hours = this.meridian === 'PM' && hours > 12 ? hours - 12 : hours;

            // Special case for 12
            if (this.meridian === 'PM' && hours === 24) {
                hours = 12;
            } else if (this.meridian === 'AM' && hours === 0) {
                hours = 12;
            }
        }

        this.hours = hours.toString().length === 1 ? `0${hours.toString()}` : hours.toString();
        this.minutes = minutes.toString().length === 1 ? `0${minutes.toString()}` : minutes.toString();
    }

    onDateSelected(event: { month?: any, year?: any, day?: any, date?: Date }) {
        this.datePickerValue = event.date;
        this.model = this.createFullDateValue(this.datePickerValue, this.timePickerValue);
        this.setDateLabels(this.model);
        this.onModelChange(this.model);
        this.onSelect.emit({ date: this.model });
        this.toggleView('time');
    }

    onTimeSelected(event: { hours?: number, minutes?: number, meridian?: string, date?: Date, text?: string }) {
        this.timePickerValue = event.date;
        this.model = this.createFullDateValue(this.datePickerValue, this.timePickerValue);
        this.setTimeLabels(this.model);
        this.onModelChange(this.model);
        this.onSelect.emit({ date: this.model });
    }

    createFullDateValue(datePickerValue: Date, timePickerValue: Date) {
        return dateFns.setMilliseconds(dateFns.setSeconds(dateFns.setMinutes(dateFns.setHours(datePickerValue, dateFns.getHours(timePickerValue)), dateFns.getMinutes(timePickerValue)), dateFns.getSeconds(timePickerValue)), dateFns.getMilliseconds(timePickerValue));
    }

    // ValueAccessor Functions
    writeValue(model: any): void {
        this.model = model;
        if (Helpers.isEmpty(model)) {
            this.model = new Date();
        } else if (!isNaN(model)) {
            this.model = new Date(model);
        }
        this.datePickerValue = this.model;
        this.timePickerValue = this.model;
        if (Helpers.isDate(this.model)) {
            this.setDateLabels(this.model);
            this.setTimeLabels(this.model);
        }
    }

    registerOnChange(fn: Function): void {
        this.onModelChange = fn;
    }

    registerOnTouched(fn: Function): void {
        this.onModelTouched = fn;
    }
}