import {Component, EventEmitter, HostListener, Input, OnInit, Output, ViewChild} from '@angular/core';

@Component({
    selector: 'wysiwyg-editor',
    templateUrl: './wysiwyg.component.html',
    styleUrls: ['./wysiwyg.component.scss'],
})
export class WysiwygComponent implements OnInit {
    @ViewChild('editable') editable;
    @Input() readonly = false;
    @Input() contents = '';
    @Output() contentsChanged: EventEmitter<string> = new EventEmitter<string>();

    public isFocused = false;
    protected hadOneFocusOut = false;
    public initialValue = '';

    public get displayContents() {
        return this.contents.replace(/</g, '\n<').replace(/(https?:\/\/[^\s]+)/g, (val) => `<a href="${val}" target="_blank">${val}</a>`);
    }

    public isDark() {
        return document.body.classList.contains('dark');
    }

    ngOnInit() {
        this.initialValue = this.contents;
    }

    onFocusIn(event: MouseEvent) {
        console.log('on focus in', event);
        this.isFocused = !this.readonly;
    }

    @HostListener('document:keyup.escape', ['$event'])
    onFocusOut(event) {
        if ( !this.hadOneFocusOut ) {
            this.hadOneFocusOut = true;
            setTimeout(() => {
                this.hadOneFocusOut = false;
            }, 500);
        } else {
            this.isFocused = false;
            this.hadOneFocusOut = false;
        }
    }

    documentCommand(cmd: string) {
        // Yes, technically this is deprecated, but it'll be poly-filled if necessary. Bite me.
        document.execCommand(cmd, false, '');
    }

    onContentsChanged(contents: string) {
        const innerHTML = this.editable.nativeElement.innerHTML;
        if ( this.contents !== innerHTML ) {
            this.contents = innerHTML;
            this.contentsChanged.emit(innerHTML);
        }
    }

    @HostListener('document:keydown.tab', ['$event'])
    onIndent(event) {
        event.preventDefault();
        this.documentCommand('indent');
    }

    @HostListener('document:keydown.shift.tab', ['$event'])
    onOutdent(event) {
        event.preventDefault();
        this.documentCommand('outdent');
    }

    @HostListener('document:keydown.control.b', ['$event'])
    onBold(event) {
        event.preventDefault();
        this.documentCommand('bold');
    }

    @HostListener('document:keydown.control.i', ['$event'])
    onItalic(event) {
        event.preventDefault();
        this.documentCommand('italic');
    }

    @HostListener('document:keydown.control.u', ['$event'])
    onUnderline(event) {
        event.preventDefault();
        this.documentCommand('underline');
    }

    @HostListener('document:keydown.control.z', ['$event'])
    onUndo(event) {
        event.preventDefault();
        this.documentCommand('undo');
    }

    @HostListener('document:keydown.control.shift.z', ['$event'])
    onRedo(event) {
        event.preventDefault();
        this.documentCommand('redo');
    }
}