import { Injectable } from '@angular/core';
import { AppConf } from '../app-conf/app-conf';
import { AuthService } from '../auth/auth';
import { AppUtil } from '../app-util/app-util';

@Injectable()
export class LoginSvc {

    constructor(public authService: AuthService, public appConf: AppConf, public appUtil: AppUtil, 
    /*public navCtrl: NavController*/) {
        console.log('Hello LoginProvider Provider');
    }

    /* self.loginFailed = false; */
    /* self.error = null; */

    public checkLogin() {
        let promise = new Promise((resolve, reject) => {
            if (this.appUtil.isNull(this.appConf.getUserName()) || this.appUtil.isNull(this.appConf.getUserToken())) {
                reject({
                    "Error": "Not able to find the Token"
                });
                reject({});
            } else {
                this.authService.checkTokenLogin().then((res) => {
                    this.onSucess(res).then((res) => {
                        resolve(res['Success']);
                    }, (rej) => {
                        reject(rej);
                    });
                }, (res) => {
                    this.onFailer(res).then((res) => {
                        reject(res);
                    }, (rej) => {
                        reject(rej);
                    });
                });
            }
        });
        return promise;
    }

    public logout() {
        this.appConf.removeLoginParam();          // AppConf.removeLoginParam();
        localStorage.clear();                     // to clear history and cache
    }

    public onSucess(response) {
        let error = response.Error;
        let promise = new Promise((resolve, reject) => {
            if (error) {
                reject(response);
            } else {
                if (response.RowCount > 0) {
                    if (response.ADLoginResponse.Token) {
                        this.appConf.setUserToken(response.ADLoginResponse.Token);
                        this.appConf.setUserID(response.DataSet.DataRow.field.val);
                    }
                    resolve(response);
                } else {
                    reject({
                        "Error": "No matches found. Please enter valid data!!"
                    });
                }
            }
        });
        return promise;
    }

    public onFailer(response) {
        let error = response.Error;
        let promise = new Promise((resolve, reject) => {
            if (error) {
                resolve(response);
            } else {
                reject({
                    "Error": "Login failed.. Please contact Administrator"
                });
            }
        });
        return promise;
    }

    public doLogin(param) {
        let loginSvcInstance = this;
        this.appConf.setUserName(param.username);
        let promise = new Promise((resolve, reject) => {
            this.authService.login(param).then((res) => {
                loginSvcInstance.onSucess(res).then((res) => {
                    resolve(res);
                }, (rej) => {
                    reject(rej);
                });
            }, (res) => {
                loginSvcInstance.onFailer(res).then((res) => {
                    reject(res);
                }, (rej) => {
                    reject(rej);
                });
            });
        });
        return promise;
    }
}