/*
 * @Author: HonorLee
 * @Version 2.0
 * @LastUpdate 2019/10/11
*/
import PATH = require('path');

export default class Router{
    private static _midware:any = {};
    private static _midwareIndex:Array<string> = [];
    public static setMidware(rule:RegExp,func:any){
        const reg = rule.toString();
        if(!Router._midware[reg]){
            Router._midware[reg] = {exp:rule,handler:[]};
            Router._midwareIndex.push(reg);
        }
        Router._midware[reg].handler.push(func);
    }
    public static async run(requestData:RequestData){
        let method  = 'index';
        let handlerFile;
        Object.keys(SYSTEM.MVC.ROUTER_MAP).forEach(path=>{
            if(requestData.path && requestData.path.indexOf(path) == 0){
                if(SYSTEM.MVC.ROUTER_MAP[path].constructor==String){
                    requestData.path = `${SYSTEM.MVC.ROUTER_MAP[path]}${requestData.path.replace(path,'')}`;
                }else if(SYSTEM.MVC.ROUTER_MAP[path].constructor==Object){
                    if(SYSTEM.MVC.ROUTER_MAP[path].method){
                        if(requestData.method!=SYSTEM.MVC.ROUTER_MAP[path].method){
                            if(requestData.res){
                                requestData.res.statusCode = 400;
                                requestData.res.write('Unauthorized request method!');
                                requestData.res.end();
                            }
                            return
                        }
                    }
                    if(SYSTEM.MVC.ROUTER_MAP[path].forward){
                        requestData.path = `${SYSTEM.MVC.ROUTER_MAP[path].forward}${requestData.path.replace(path,'')}`;
                    }
                }
            }
        })
        if(requestData.path == '/'){
            handlerFile = '/index.js'
        }else if(requestData.path && requestData.path.match(/\/$/g)){
            handlerFile = `${requestData.path}index.js`;
        }else if(requestData.path){
            try{
                FILE.statSync(`${SYSTEM.MVC.PATH.CONTROLLER}${requestData.path}.js`)
                handlerFile = `${requestData.path}.js`;
            }catch(e){
                const pathArr = requestData.path.split('/');
                method = pathArr.pop() || 'index';
                const path = pathArr.join('/');
                try{
                    FILE.statSync(`${SYSTEM.MVC.PATH.CONTROLLER}${path}.js`)
                    handlerFile = `${path}.js`;
                }catch(e){
                    try{
                        FILE.statSync(`${SYSTEM.MVC.PATH.CONTROLLER}${path}/index.js`);
                        handlerFile = `${path}/index.js`;
                    }catch(e){
                        handlerFile = null;
                    }
                }
            }
        }else{
            handlerFile = null;
        }
        if(method == '__construct') return Router._error(403,'Function __construct can\'t be called outside',requestData.res);
        if(!handlerFile) return Router._error(404,`No such handler [${requestData.path}]`,requestData.res);

        handlerFile = `${SYSTEM.MVC.PATH.CONTROLLER}${handlerFile}`;
        let handlerClass,handler;
        try {
            // eslint-disable-next-line @typescript-eslint/no-var-requires
            handlerClass = require(handlerFile);
            if(handlerClass.default) handlerClass = handlerClass.default;
        }catch(e:any){
            console.log(e.stack);
            if(e.code=='MODULE_NOT_FOUND'){
                Router._error(404,null,requestData.res);
            }else{
                Router._error(404,e.stack,requestData.res);
            }
            return;
        }
        try{
            handler = new handlerClass(requestData);
            // const mixHandler = handler;
        }catch(e:any){
            return Router._error(403,e.stack,requestData.res);
        }
        // if(handler instanceof CONTROLLER){
        //     mixHandler = handler;
        // }else{
        //     const baseClass  = new CONTROLLER(requestData);
        //     mixHandler = Object.assign(baseClass,handler);
        // }
        
        if(typeof handler[method]==='function'){
            let returnSometing;
            if(requestData.path && Router._midwareIndex.length){
                for(const reg of Router._midwareIndex){
                    const match = requestData.path.match(Router._midware[reg].exp);
                    if(match && match.index==0){
                        for(const func of Router._midware[reg].handler){
                            const ret = await func.call(handler,handler);
                            if(ret==false) return;
                        }
                    }
                }
            }
            if(typeof handler['__construct']==='function'){
                try{
                    returnSometing = await handler['__construct'].call(handler);
                }catch(e:any){
                    LOGGER.error(`Function __construct in [${handlerFile}] called error:`);
                    Router._error(403,e.stack,requestData.res);
                    return;
                }
                if(returnSometing == false) return;
            }
            if(handler[method].prototype && handler[method].prototype.method && handler[method].prototype.method.toLowerCase()!=requestData.method) return handler.end('Unauthorized request method',400);
            try{
                await handler[method].call(handler,returnSometing);
            }catch(e:any){
                LOGGER.error(`Function [${method}] in [${handlerFile}] called error:`);
                Router._error(403,e.stack,requestData.res);
            }
        }else{
            Router._error(404,`No such method [${method}] in handler [${handlerFile}]`,requestData.res);
        }
    }
    private static _error(code:number,errMsg:string|null,res:any){
        if(errMsg) LOGGER.error(errMsg);
        res.writeHead(code, {'Content-Type': 'text/html'});
        res.end(`<center style="font-size:24px">- ${code} -</center>`);
    }
    // private static _encodeRequestData(req){
    //     req._GET = Router._encodeObj(req._GET);
    //     req._POST = Router._encodeObj(req._POST);
    // }
    // private static _encodeObj(obj){
    //     let newObj = {};
    //     Object.keys(obj).forEach(key=>{
    //         if(typeof(obj[key]==='string')){
    //             newObj[encodeURI(key)] = encodeURI(obj[key]);
    //         }else{
    //             newObj[encodeURI(key)] = obj[key];
    //         }
    //     })
    //     return newObj;
    // }
}

// module.exports = Router;