const frappe = require('frappejs');
const octicons = require('octicons');
const utils = require('frappejs/client/ui/utils');

class Tree {
    constructor({parent, label, iconSet, withSkeleton, method}) {
		Object.assign(this, arguments[0]);
		this.nodes = {};
		if(!iconSet) {
			this.iconSet = {
				open: octicons["triangle-down"].toSVG({ "width": 10, "class": "node-parent"}),
				closed: octicons["triangle-right"].toSVG({ "width": 5, "class": "node-parent"}),
				leaf: octicons["primitive-dot"].toSVG({ "width": 7, "class": "node-leaf"})
			};
		}
		this.make();
    }

    make() {
		this.tree = frappe.ui.create('div', {
			inside: this.parent,
			className: 'tree ' + (this.withSkeleton ? 'with-skeleton' : '')
		});

		this.rootNode = this.makeNode(this.label, this.label, true, null, this.tree);
		this.expandNode(this.rootNode);
	}

	refresh() {
		// this.selectedNode.parentNode &&
		// 	this.loadChildren(this.selectedNode.parentNode, true);
	}

	loadChildren(node, deep=false) {
		if(!deep) {
			this.renderNodeChildren(node, this.method(node.value));
		} else {
			this.renderChildrenDeep(node, this.getAllNodes(node.value));
		}
	}

	renderChildrenDeep(dataList) {
		dataList.map(d => { this.renderNodeChildren(this.nodes[d.parent], d.data); });
	}

	renderNodeChildren(node, dataSet=[]) {
		frappe.ui.empty(node.childrenList);

		dataSet.forEach(data => {
			let parentNode = this.nodes[node.value];
			let childNode = this.makeNode(data.label || data.value, data.value,
				data.expandable, parentNode);
			childNode.treeLink.dataset.nodeData = data;
		});
		node.expanded = false;

		// As children loaded
		node.loaded = true;
		this.onNodeClick(node, false);
	}

	getAllNodes() { }

	makeNode(label, value, expandable, parentNode, parentEl) {
		let node = {
			parent: parent,
			label: label,
			value: value,
			loaded: 0,
			expanded: 0,
			expandable: expandable,
		};

		if(parentNode){
			node.parentNode = parentNode;
			node.parent = parentNode.childrenList;
			node.isRoot = 0;
		} else {
			node.isRoot = 1;
			node.parent = parentEl;
		}

		this.nodes[value] = node;
		this.buildNodeElement(node);
		this.onRender && this.onRender(node);

		return node;
	}

	buildNodeElement(node) {
		node.parentLi = frappe.ui.create('li', {
			inside: node.parent,
			className: 'tree-node'
		});

		let iconHtml = '';
		if(this.iconSet) {
			iconHtml = node.expandable ? this.iconSet.closed : this.iconSet.leaf;
		}
		let labelEl = `<a class="tree-label"> ${node.label}</a>`;

		node.treeLink = frappe.ui.create('span', {
			inside: node.parentLi,
			className: 'tree-link',
			'data-label': node.label,
			innerHTML: iconHtml + labelEl
		});
		node.treeLink.dataset.node = node;
		node.treeLink.addEventListener('click', () => {
			this.onNodeClick(node);
		});

		node.childrenList = frappe.ui.create('ul', {
			inside: node.parentLi,
			className: 'tree-children hide'
		});

		// if(this.toolbar) {
		// 	node.toolbar = this.getToolbar(node).insertAfter(node.treeLink);
		// }
	}

	onNodeClick(node, click = true) {
		this.setSelectedNode(node);
		if(click) {
			this.onClick && this.onClick(node);
		}
		this.expandNode(node);
		// select link
		utils.activate(this.tree, node.treeLink, 'tree-link', 'active');
		if(node.toolbar) this.showToolbar(node);
	}

	expandNode(node) {
		if(node.expandable) {
			this.toggleNode(node);
		}

		node.expanded = !node.expanded;
		// node.parent.classList.toggle('opened', node.expanded);
		node.parent.classList.add('opened');
		node.parentLi.classList.add('opened');
	}

	toggleNode(node) {
		if(!node.loaded) this.loadChildren(node);

		// expand children
		if(node.childrenList) {
			if(node.childrenList.innerHTML.length) {
				node.childrenList.classList.toggle('hide', !node.expanded);
			}

			// open close icon
			if(this.iconSet) {
				const oldIcon = node.treeLink.querySelector('svg');
				const newIconKey = !node.expanded ? 'closed' : 'open';
				const newIcon = frappe.ui.create(this.iconSet[newIconKey]);
				node.treeLink.replaceChild(newIcon, oldIcon);
			}
		}
	}

	getSelectedNode() { return this.selectedNode; }

	setSelectedNode(node) { this.selectedNode = node; }

	showToolbar() { }
}

module.exports = Tree;