import ngModule from '../../module';
import './style.css';

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

export class Popover {
    constructor($document, $compile, $transitions) {
        this.document = $document[0];
        this.$compile = $compile;
        this.$transitions = $transitions;
        this.removeScope = false;
        this.popOpens = 0;
    }
    _init() {
        this.docMouseDownHandler = e => this.onDocMouseDown(e);
        this.document.addEventListener('mousedown', this.docMouseDownHandler);
        this.docKeyDownHandler = e => this.onDocKeyDown(e);
        this.document.addEventListener('keydown', this.docKeyDownHandler);
        this.deregisterCallback = this.$transitions.onStart({},
            () => this.hideAll());
    }
    _destroy() {
        this.document.removeEventListener('mousedown', this.docMouseDownHandler);
        this.document.removeEventListener('keydown', this.docKeyDownHandler);
        this.docMouseDownHandler = null;
        this.docKeyDownHandler = null;
        this.deregisterCallback();
    }
    show(childElement, parent, popoverId) {
        this.childElement = childElement;
        let popover = this.document.createElement('div');
        this.popOpens++;

        if (!popoverId) {
            popoverId = 'popover-' + this.popOpens;
            popover.id = popoverId;
        }

        popover.className = 'vn-popover';
        popover.addEventListener('mousedown',
            e => this.onPopoverMouseDown(e));
        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);

        if (this.popOpens === 1) {
            this._init();
        }
        return popoverId;
    }

    showComponent(childComponent, $scope, parent) {
        let childElement = this.document.createElement(childComponent);
        let id = 'popover-' + this.popOpens;
        childElement.id = id;
        this.removeScope = true;
        this.$compile(childElement)($scope.$new());
        this.show(childElement, parent, id);
        return childElement;
    }

    _checkOpens() {
        this.popOpens = this.document.querySelectorAll('*[id^="popover-"]').length;
        if (this.popOpens === 0) {
            this._destroy();
        }
    }

    _removeElement(val) {
        if (!val) return;
        let element = angular.element(val);
        let parent = val.parentNode;
        if (element.scope() && element.scope().$id > 1) {
            element.scope().$destroy();
        }
        element.remove();
        if (parent.className.indexOf('vn-popover') !== -1)
            this._removeElement(parent);
    }

    hide(id) {
        let popover = this.document.querySelector(`#${id}`);
        if (popover) {
            this._removeElement(popover);
        }
        this._checkOpens();
    }

    hideChilds(id) {
        let popovers = this.document.querySelectorAll('*[id^="popover-"]');
        let idNumber = parseInt(id.split('-')[1], 10);
        popovers.forEach(
            val => {
                if (parseInt(val.id.split('-')[1], 10) > idNumber)
                    this._removeElement(val);
            }
        );
        this._checkOpens();
    }

    hideAll() {
        let popovers = this.document.querySelectorAll('*[id^="popover-"]');
        popovers.forEach(
            val => {
                this._removeElement(val);
            }
        );
        this._checkOpens();
    }

    _findPopOver(node) {
        while (node != null) {
            if (node.id && node.id.startsWith('popover-')) {
                return node.id;
            }
            node = node.parentNode;
        }
        return null;
    }

    onDocMouseDown(event) {
        let targetId = this._findPopOver(event.target);
        if (targetId) {
            this.hideChilds(targetId);
        } else {
            this.hideAll();
        }
    }

    onDocKeyDown(event) {
        if (event.keyCode === 27) {
            let targetId = this._findPopOver(this.lastTarget);
            if (targetId) {
                this.hideChilds(targetId);
            } else {
                this.hideAll();
            }
            this.lastTarget = null;
        }
    }

    onPopoverMouseDown(event) {
        this.lastTarget = event.target;
    }
}
Popover.$inject = ['$document', '$compile', '$transitions'];

ngModule.service('vnPopover', Popover);