#include "loginDialog.h"

#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QMessageBox>

#include<QDebug>

LoginDialog::LoginDialog(QWidget *parent):QDialog(parent)
{
   
    this->setFixedSize(380, 300);
    userLabel = new QLabel(this);
    userLabel->move(70, 80);
    userLabel->setText(tr("用户名"));

    userEditLine = new QLineEdit(this);
    userEditLine->move(150, 80);
    userEditLine->setPlaceholderText(tr("请输入用户名"));

    pwdLabel = new QLabel(this);
    pwdLabel->move(70, 130);
    pwdLabel->setText(tr("密码"));

    pwdEditLine = new QLineEdit(this);
    pwdEditLine->move(150, 130);
    pwdEditLine->setPlaceholderText(tr("请输入密码"));
    pwdEditLine->setEchoMode(QLineEdit::Password);

    loginBtn = new QPushButton(this);
    loginBtn->move(60, 200);
    loginBtn->setText(tr("登录"));

    exitBtn = new QPushButton(this);
    exitBtn->move(220, 200);
    exitBtn->setText(tr("退出"));

    connect(loginBtn, &QPushButton::clicked, this, &LoginDialog::login);
    connect(exitBtn, &QPushButton::clicked, this, &LoginDialog::close);

    // 待解锁的组件名称
    setting_name = {"cloud_topic", "laser_topic", "open_file", "bag_progress", "fixd_frame_topic"};
    // 账号路径
    user_file_name = "../PointVisual/src/point_visual/sources/user/user.txt";

    // 创建用户表存下
    createUser();
    // userPasswords["root"] = hashPassword("root123");
    // userPasswords["wbw"] = hashPassword("123");
}


void LoginDialog::createUser(){
    std::ifstream inputFile(user_file_name);
        // 第一次读写user.txt将user加密后，建立userPasswords
    if(inputFile.is_open()){
        std::string line;
        while(std::getline(inputFile, line)){
            std::istringstream iss(line);
            std::string username, pwd;
            if(iss>> username && iss>> pwd){
                if(pwd.size() <= 8){
                    // 根据长度判断是否已经被加密
                    pwd = hashPassword(pwd);
                }
                // 创建map/用户表
                userPasswords[QString::fromStdString(username)] = QString::fromStdString(pwd);
            }
        }
        inputFile.close();
    }else{
        qDebug() << "Unable to open the user.txt.";
    }
    writeHash(userPasswords);
}

// 加密后的账户密码写入user.txt
void LoginDialog::writeHash(const std::map<QString, QString> user){
    std::ofstream file(user_file_name);

    if(file.is_open()){
        for(auto iter = user.begin(); iter != user.end() ; iter++){
            file << (iter->first).toStdString() << " ";
            file << (iter->second).toStdString() << std::endl;
        }
        file.close();
    }else{
        qDebug()<<"Unable to write hashcode!!!";
    }
}


// hash加密函数
QString LoginDialog::hashPassword(const QString& pwd) {
    std::string password = pwd.toStdString();
    unsigned char hash[SHA256_DIGEST_LENGTH];
    SHA256_CTX sha256;
    SHA256_Init(&sha256);
    SHA256_Update(&sha256, password.c_str(), password.size());
    SHA256_Final(hash, &sha256);

    std::string hashedPassword;
    for (int i = 0; i < SHA256_DIGEST_LENGTH; ++i) {
        hashedPassword += hash[i];
    }
    return QString(hashedPassword.c_str());
}

// 重载加密函数
std::string LoginDialog::hashPassword(const std::string& password) {
    // std::string password = pwd.toStdString();
    unsigned char hash[SHA256_DIGEST_LENGTH];
    SHA256_CTX sha256;
    SHA256_Init(&sha256);
    SHA256_Update(&sha256, password.c_str(), password.size());
    SHA256_Final(hash, &sha256);

    std::string hashedPassword;
    for (int i = 0; i < SHA256_DIGEST_LENGTH; ++i) {
        hashedPassword += hash[i];
    }
    return hashedPassword;
}


// 判断用户账号返回不同code
int LoginDialog::checkUser(const QString username, const QString pwd){
    auto iter = userPasswords.find(username);
    if(iter != userPasswords.end()){
        if(pwd.size() > 8) { return 1; }
        if(iter->second == hashPassword(pwd)){
         // 用户密码都对
         return 2;
        }else{
         // 用户对，密码不对
         return 1;
        }
    }else {
        // 用户不对
        return 0;
    }
}

// 槽函数
void LoginDialog::login()
{
    int flag = checkUser(userEditLine->text().trimmed(), pwdEditLine->text());
    switch(flag){
        case 0: {
            QMessageBox::warning(this, tr("登录失败"), tr("用户名错误"), QMessageBox::Ok);
            break;
        }
        case 1: {
            QMessageBox::warning(this, tr("登录失败"), tr("密码错误"), QMessageBox::Ok);
            break;
        }
        case 2:{
            for(int i=0 ; i<setting_name.size(); i++){
                QWidget *foundChild = parent()->findChild<QWidget*>(setting_name[i]);
                if (foundChild) {
                    // 找到了指定的子组件 在这里可以对子组件进行操作
                    foundChild->setEnabled(true); 
                }else{
                    qDebug()<<"第" << i+1 <<"组件未找到" ;
                }
            }
            QMessageBox::information(this, tr("登录成功"), tr("已解锁"), QMessageBox::Ok);
            accept();
        }
    }
    userEditLine->clear();
    pwdEditLine->clear();
    userEditLine->setFocus();
}


LoginDialog::~LoginDialog()
{

}