import {NgModule,Component,Input,Output,EventEmitter,forwardRef,ChangeDetectorRef,ContentChild,TemplateRef,SimpleChanges,OnChanges,ChangeDetectionStrategy, ViewEncapsulation} from '@angular/core';
import {CommonModule} from '@angular/common';
import {SelectItem} from 'mirra-ui/api';
import {ObjectUtils} from 'mirra-ui/utils';
import {RippleModule} from 'mirra-ui/ripple';
import {NG_VALUE_ACCESSOR, ControlValueAccessor} from '@angular/forms';

export const SELECTBUTTON_VALUE_ACCESSOR: any = {
  provide: NG_VALUE_ACCESSOR,
  useExisting: forwardRef(() => SelectButton),
  multi: true
};

@Component({
    selector: 'p-selectButton',
    template: `
        <div [ngClass]="'p-selectbutton p-buttonset p-component'" [ngStyle]="style" [class]="styleClass"  role="group">
            <div *ngFor="let option of options; let i = index" #btn class="p-button p-component btn {{buttonClass}}" [class]="option.styleClass" role="button" [attr.aria-pressed]="isSelected(option)"
                [ngClass]="{'p-highlight active':isSelected(option), 'p-disabled': disabled || option.disabled,
                'p-button-icon-only': (option.icon && !option.label)}" (click)="onItemClick($event,option,i)" (keydown.enter)="onItemClick($event,option,i)"
                [attr.title]="option.title" [attr.aria-label]="option.label" (blur)="onBlur($event)" [attr.tabindex]="tabindex" [attr.aria-labelledby]="ariaLabelledBy" pRipple>
                <ng-container *ngIf="!itemTemplate else customcontent">
                    <span [ngClass]="'p-button-icon p-button-icon-left'" [class]="option.icon" *ngIf="option.icon"></span>
                    <span class="p-button-label">{{option.label}}</span>
                </ng-container>
                <ng-template #customcontent>
                    <ng-container *ngTemplateOutlet="itemTemplate; context: {$implicit: option, index: i}"></ng-container>
                </ng-template>
            </div>
        </div>
    `,
    providers: [SELECTBUTTON_VALUE_ACCESSOR],
    changeDetection: ChangeDetectionStrategy.OnPush,
    encapsulation: ViewEncapsulation.None,
    styleUrls: ['./selectbutton.scss', '../button/button.scss']
})
export class SelectButton implements ControlValueAccessor, OnChanges {

    @Input() tabindex: number = 0;

    @Input() multiple: boolean;

    @Input() style: any;

    @Input() styleClass: string;

    @Input() buttonClass: string;

    @Input() ariaLabelledBy: string;

    @Input() disabled: boolean;

    @Input() dataKey: string

    @Input() optionLabel: string;

    @Output() onOptionClick: EventEmitter<any> = new EventEmitter();

    @Output() onChange: EventEmitter<any> = new EventEmitter();

    @ContentChild(TemplateRef) itemTemplate;

    value: any;

    _options: any[];

    onModelChange: Function = () => {};

    onModelTouched: Function = () => {};

    constructor(private cd: ChangeDetectorRef) {}

    @Input() get options(): any[] {
        return this._options;
    }

    set options(val: any[]) {
        //NoOp
    }

    ngOnChanges(simpleChange: SimpleChanges) {
        if (simpleChange.options) {
            this._options = this.optionLabel ? ObjectUtils.generateSelectItems(simpleChange.options.currentValue, this.optionLabel) : simpleChange.options.currentValue;
        }
    }

    writeValue(value: any) : void {
        this.value = value;
        this.cd.markForCheck();
    }

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

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

    setDisabledState(val: boolean): void {
        this.disabled = val;
    }

    onItemClick(event, option: SelectItem, index: number) {
        if (this.disabled || option.disabled) {
            return;
        }

        if (this.multiple) {
            let itemIndex = this.findItemIndex(option);
            if (itemIndex != -1)
                this.value = this.value.filter((val,i) => i!=itemIndex);
            else
                this.value = [...this.value||[], option.value];
        }
        else {
            this.value = option.value;
        }

        this.onOptionClick.emit({
            originalEvent: event,
            option: option,
            index: index
        });

        this.onModelChange(this.value);

        this.onChange.emit({
            originalEvent: event,
            value: this.value
        });
    }

    onBlur(event) {
        this.onModelTouched();
    }

    isSelected(option: SelectItem) {
        if (this.multiple)
            return this.findItemIndex(option) != -1;
        else
            return ObjectUtils.equals(option.value, this.value, this.dataKey);
    }

    findItemIndex(option: SelectItem) {
        let index = -1;
        if (this.value) {
            for(let i = 0; i < this.value.length; i++) {
                if (this.value[i] == option.value) {
                    index = i;
                    break;
                }
            }
        }
        return index;
    }
}

@NgModule({
    imports: [CommonModule,RippleModule],
    exports: [SelectButton],
    declarations: [SelectButton]
})
export class SelectButtonModule { }