'''
本模块用于创建登录界面并保存用户信息
'''
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLineEdit, QPushButton, QVBoxLayout, QHBoxLayout, QLabel
from PyQt5.QtCore import Qt,QTimer
from PyQt5.QtGui import QPixmap, QPainter
import platform
from solve_path import b2_path, b2txt_path
import json
from show_welcome import show_image
platf = platform.platform()
class MyApp(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        # 加载背景图片
        if 'Windows' in platf:
            b2_path.replace('\b','\\b')
        self.background = QPixmap(b2_path)
        # 创建一个垂直布局
        mainLayout = QVBoxLayout()

        # 创建三个文本框并设置占位符
        self.nameEdit = QLineEdit()
        self.pwdEdit = QLineEdit()
        self.urlEdit = QLineEdit()

        # 创建一个按钮并连接信号
        btn = QPushButton('提交')
        btn.clicked.connect(self.onSubmit)

        # 创建一个用于显示错误信息的标签
        self.errorLabel = QLabel('', self)
        self.errorLabel.hide()  # 初始时隐藏该标签

        self.setWindowTitle('头歌助手登录')

        # 对于每个输入框，创建一个水平布局以保持居中
        for label_text, edit_widget in [("用户名", self.nameEdit), 
                                        ("密   码", self.pwdEdit), 
                                        ("实训网址", self.urlEdit)]:
            hbox = QHBoxLayout()
            hbox.addStretch()
            vbox_inner = QVBoxLayout()
            vbox_inner.addWidget(QLabel(label_text))
            vbox_inner.addWidget(edit_widget)
            hbox.addLayout(vbox_inner)
            hbox.addStretch()
            mainLayout.addLayout(hbox)

        # 添加按钮和错误信息标签到布局
        mainLayout.addWidget(btn, 0, Qt.AlignCenter)
        mainLayout.addWidget(self.errorLabel, 0, Qt.AlignCenter)

        # 设置窗口的布局
        self.setLayout(mainLayout)
        self.setGeometry(350, 350, 1200, 700)
        self.centerWindow()

        # 应用样式
        self.applyStyles()

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.drawPixmap(self.rect(), self.background)

    def centerWindow(self):
        qr = self.frameGeometry()
        cp = QApplication.desktop().availableGeometry().center()
        qr.moveCenter(cp)
        self.move(qr.topLeft())

    def applyStyles(self):
        self.setStyleSheet("""
            QLineEdit {
                border: 1px solid gray; 
                border-radius: 10px; 
                padding: 5px; 
                background: rgba(255, 255, 255, 100);  
                color: black;
                width: 300px;
                height: 50px;
                font-size: 14pt; /* 设置字号为14磅 */
                font-family: 'Microsoft YaHei'; /* 设置字体为微软雅黑 */
            }
            QLineEdit:focus {
                border: 3px solid black;
            }
            QLabel {
                color: black;
                font-size: 20pt; 
                font-family: "Microsoft YaHei";
                margin-top: 50px; /* 顶部外边距 */
                margin-left: 200px; /* 左侧外边距 */
            }
            QPushButton {
                border: 1px solid gray;
                border-radius: 10px;
                background: rgba(255, 255, 255, 100);
                color: black;
                width: 100px;
                height: 27px;
            }
            /* 样式用于错误信息标签 */
            QLabel#errorLabel {
                color: red;
                font-size: 16pt;
            }
        """)

    def onSubmit(self):
        name = self.nameEdit.text()
        pwd = self.pwdEdit.text()
        url = self.urlEdit.text()
        
        if name == '' or pwd == '' or url == '':
            self.showError("非法输入！")
        else:
            with open('userinfo.json', 'w') as f:
                json.dump({'name': name, 'pwd': pwd, 'url': url}, f)
            self.close()

    def showError(self, message):
        self.errorLabel.setText(message)
        self.errorLabel.show()
        QTimer.singleShot(1200, self.hideError)

    def hideError(self):
        self.errorLabel.hide()
        # 关闭窗口


def show_login():
    app = QApplication(sys.argv)
    ex = MyApp()
    ex.show()
    app.exec_()
if __name__ == '__main__':
    show_image()
    show_login()