/**
 * Created by jackyanjiaqi on 16/12/16.
 */
import * as file from "./file";
import PATH = require("path");
import * as CONFIG from "./config";

var __crcSyncConfig:IExmlsCRC = null;

export interface IExmlsCRC {
    lasttime?:string,
    exmls?: { [path:string]: string },
    __savePath?:string
}

function initFromProject():IExmlsCRC{
    let crcSyncFilePath = PATH.resolve(CONFIG.getProjectDir(),".exmlCrcSync");
    let crcSyncConfig:IExmlsCRC = {exmls:{}};
    if(file.exists(crcSyncFilePath)){
        crcSyncConfig = JSON.parse(file.read(crcSyncFilePath));
    }
    crcSyncConfig.__savePath = crcSyncFilePath;
    return crcSyncConfig;
}

export function save(){
    if(__crcSyncConfig){
        __crcSyncConfig.lasttime = new Date().toLocaleDateString();
        let savePath = __crcSyncConfig.__savePath;
        delete __crcSyncConfig.__savePath;
        file.save(savePath,JSON.stringify(__crcSyncConfig,null,4));
    }
}

export function crcSyncFilter(item:any){
    //step1.读取crcSync文件
    if(!__crcSyncConfig){
        __crcSyncConfig = initFromProject();
    }
    //step2.根据crc32值过滤掉不需要编译的文件
    let path;
    let content;
    if(typeof item === "string"){
        path = item;
        content = file.read(PATH.resolve(CONFIG.getProjectDir(),path));
    }else{
        path = item.path;
        content = item.content?item.content:file.read(PATH.resolve(CONFIG.getProjectDir(),path));
    }
    let crc32 = require("../import/crc32.js");
    let marker = crc32(content,null);
    if(path in __crcSyncConfig.exmls){
        if(marker != __crcSyncConfig.exmls[path]){
            //存储到crc同步配置中
            __crcSyncConfig.exmls[path] = marker;
            return true;
        }else{
            return false;
        }
    }else{
        __crcSyncConfig.exmls[path] = marker;
        return true;
    }
}