/* 
* @Author: 陶秋峰
* @Date:   2016-01-08 07:49:53
* @Last Modified by:   陶秋峰
* @Last Modified time: 2016-01-08 08:49:57
* @CopyRight 蛮蛮工作室
*/
import * as dom from './dom';
import * as dom_construct from './dom-construct';

const force_prop_names = {
	innerHTML:	1,
	textContent:1,
	className:	1,
	htmlFor:	0,	// has("ie"),
	value:		1
};

const attr_ames = {
	// original attribute names
	classname: "class",
	htmlfor: "for",
	// for IE
	tabindex: "tabIndex",
	readonly: "readOnly"
};

const prop_names = {
	// properties renamed to avoid clashes with reserved words
	"class": "className",
	"for": "htmlFor",
	// properties written as camelCase
	tabindex: "tabIndex",
	readonly: "readOnly",
	colspan: "colSpan",
	frameborder: "frameBorder",
	rowspan: "rowSpan",
	textcontent: "textContent",
	valuetype: "valueType"
};

function get_text(node: HTMLElement): string {
	let text = "";
	let ch = node.childNodes;
	for(let i = 0, n; n = ch[i]; i++){
		if(n.nodeType != 8){
			if(n.nodeType == 1){
				text += get_text(n);
			}else{
				text += n.nodeValue;
			}
		}
	}
	return text;
}

function has_attr(node: HTMLElement, name: string): boolean {
	let attr = node.getAttributeNode && node.getAttributeNode(name);
	return !!attr && attr.specified; // Boolean
}

export function get(node: string | HTMLElement, name: string): string {
	let el = dom.by_id(node);

	let lc = name.toLowerCase();
	let prop_name = prop_names[lc] || name;
	let force_prop = force_prop_names[prop_name];
	let value = el[prop_name];		// should we access this attribute via a property or via getAttribute()?

	if(force_prop || typeof value != "undefined"){
		// node's property
		return value;	// Anything
	}

	if(prop_name == "textContent"){
		return get_text(el);
	}

	let attrName = attr_ames[lc] || name;
	return has_attr(el, attrName) ? el.getAttribute(attrName) : null; // Anything
}

export function has(node: string | HTMLElement, name: string): boolean {
	let lc = name.toLowerCase();
	return force_prop_names[prop_names[lc] || name] || has_attr(dom.by_id(node), attr_ames[lc] || name);	// Boolean
}

export function set(node: string | HTMLElement, name: string, value: any): HTMLElement {
	let el = dom.by_id(node);
	let lc = name.toLowerCase();
	let prop_name = prop_names[lc] || name;
	let force_prop = force_prop_names[prop_name];
	if (prop_name === 'innerHTML'){
		dom_construct.empty(el);
		el[prop_name] = value;
		return el;
	} else if (prop_name === 'textContent') {
		dom_construct.empty(el);
		el.appendChild(el.ownerDocument.createTextNode(value));
		return el;
	} else if (force_prop) {
		el[prop_name] = value;
	} else {
		// node's attribute
		el.setAttribute(attr_ames[lc] || name, value);
	}
	return el; // DomNode
}

export function remove(node: string | HTMLElement, name: string): void {
	let el = dom.by_id(node);
	el && el.removeAttribute(attr_ames[name.toLowerCase()] || name);
};