import {module} from '../module';
require('./style.css');

directive.$inject = ['vnPopover'];
export function directive(popover) {
    return {
        restrict: 'A',
        link: function($scope, $element, $attrs, $ctrl) {
            $element.on('click', function(event) {
                popover.showComponent($attrs.vnDialog, $scope, $element);
                event.preventDefault();
            });
        }
    }
}
module.directive('vnPopover', directive);

export class Popover {
    constructor($document, $compile) {
        this.document = $document[0];
        this.$compile = $compile;
    }
    show(childElement, parent) {
        let popover = this.document.createElement('div');
        popover.className = 'vn-popover';
        popover.addEventListener('mousedown',
            (event) => this.onPopoverMouseDown(event));
        popover.appendChild(childElement);
        this.popover = popover;

        let style = popover.style;

        let spacing = 0;
        let screenMargin = 20;
        let dblMargin = screenMargin * 2;

        let width = popover.offsetWidth;
        let height = popover.offsetHeight;
        let innerWidth = window.innerWidth;
        let innerHeight = window.innerHeight;

        if(width + dblMargin > innerWidth) {
            width = innerWidth - dblMargin;
            style.width = width +'px';
        }
        if(height + dblMargin > innerHeight) {
            height = innerHeight - dblMargin;
            style.height = height +'px';
        }

        if(parent) {
            let parentNode = parent;
            let rect = parentNode.getBoundingClientRect();
            let left = rect.left;
            let top = rect.top + spacing + parentNode.offsetHeight;

            if(left + width > innerWidth)
                left -= (left + width) - innerWidth + margin;
            if(top + height > innerHeight)
                top -= height + parentNode.offsetHeight + spacing * 2;

            if(left < 0)
                left = screenMargin;
            if(top < 0)
                top = screenMargin;

            style.top = (top) +'px';
            style.left = (left) +'px';
            style.minWidth = (rect.width) +'px';
        }

        this.document.body.appendChild(popover);
        this.docMouseDownHandler = (event) => this.onDocMouseDown(event);
        this.document.addEventListener('mousedown', this.docMouseDownHandler);
    }
    showComponent(childComponent, $scope, parent) {
        let childElement = this.document.createElement(childComponent);
        this.$compile(childElement)($scope);
        this.show(childElement, parent);
    }
    hide() {
        if(!this.popover) return;
        this.document.removeEventListener('mousedown', this.docMouseDownHandler);
        this.document.body.removeChild(this.popover);
        this.popover = null;
        this.lastEvent = null;
        this.docMouseDownHandler = null;
    }
    onDocMouseDown(event) {
        if (event != this.lastEvent)
            this.hide();
    }
    onPopoverMouseDown(event) {
        this.lastEvent = event;
    }
}
Popover.$inject = ['$document', '$compile'];
module.service('vnPopover', Popover);