import RuleInterface from "./RuleInterface";
import FileObj from "../../vo/FileObj";
import path from 'path';

export default class DeleteRule implements RuleInterface {
	/**
	 * 类别：deletePart:部分删除，deleteAll:全部删除
	 */
	type: string;
	/**
	 * 部分删除时的开始信息
	 */
	start: DeleteRuleItem;
	/**
	 * 部分删除时的结束信息

	 */
	end: DeleteRuleItem;
	/**
	 * 忽略拓展名，true:忽略，false：不忽略
	 */
	ignorePostfix: boolean;

	constructor(data: any) {
		this.type = data.type;
		this.start = new DeleteRuleItem(data.start);
		this.end = new DeleteRuleItem(data.end);
		this.ignorePostfix = data.ignorePostfix;
	}



	deal(file: FileObj): void {
		if (this.type === 'deleteAll') {
			file.realName = "";
			if (!this.ignorePostfix) {
				file.expandName = "";
			}
		} else {
			let str = file.realName + (this.ignorePostfix ? "" : file.expandName);
			let startIndex = this.start.calIndex(str);
			let endIndex = this.end.calIndex(str);
			if (startIndex < 0 || endIndex < 0) {
				return;
			}
			str = str.substring(0, startIndex) + str.substring(endIndex + 1);
			if (this.ignorePostfix) {
				file.realName = str;
			} else {
				file.expandName = path.extname(str);
				if (file.expandName.length > 0) {
					file.realName = str.substring(0, str.lastIndexOf("."));
				} else {
					file.realName = str;
				}
			}
		}

		file.name = file.realName + file.expandName;
	}

}

class DeleteRuleItem {
	/**
	 * location:位置，text:文本，end:直到末尾
	 */
	type: string;
	/**
	 * 对应的值
	 */
	value: string;

	constructor(data: any) {
		this.type = data.type;
		this.value = data.value;
	}

	/**
	 * 计算位置
	 */
	calIndex(str: string): number {
		if (this.type === 'location') {
			return parseInt(this.value) - 1;
		} else if (this.type === 'text') {
			return str.indexOf(this.value);
		} else if (this.type === 'end') {
			return str.length - 1;
		}
		return -1;
	}
}