"""Login dialog for server authentication."""

from PyQt6.QtWidgets import (
    QDialog, QVBoxLayout, QHBoxLayout, QFormLayout,
    QLineEdit, QPushButton, QLabel, QMessageBox, QComboBox
)
from PyQt6.QtCore import Qt

from config import DEFAULT_SERVER_URL, APP_NAME


class LoginDialog(QDialog):
    """Login dialog for user authentication."""

    def __init__(self, parent=None):
        super().__init__(parent)
        self.setWindowTitle(f"{APP_NAME} - Login")
        self.setMinimumWidth(400)
        self.setModal(True)

        self._setup_ui()

    def _setup_ui(self):
        """Setup UI components."""
        layout = QVBoxLayout(self)

        # Title
        title = QLabel(APP_NAME)
        title.setStyleSheet("font-size: 18px; font-weight: bold; margin-bottom: 10px;")
        title.setAlignment(Qt.AlignmentFlag.AlignCenter)
        layout.addWidget(title)

        # Form
        form = QFormLayout()

        # Server URL
        self.server_input = QComboBox()
        self.server_input.setEditable(True)
        self.server_input.addItem(DEFAULT_SERVER_URL)
        self.server_input.setCurrentText(DEFAULT_SERVER_URL)
        form.addRow("Server:", self.server_input)

        # Username
        self.username_input = QLineEdit()
        self.username_input.setPlaceholderText("Enter username")
        form.addRow("Username:", self.username_input)

        # Password
        self.password_input = QLineEdit()
        self.password_input.setPlaceholderText("Enter password")
        self.password_input.setEchoMode(QLineEdit.EchoMode.Password)
        form.addRow("Password:", self.password_input)

        layout.addLayout(form)

        # Error label
        self.error_label = QLabel()
        self.error_label.setStyleSheet("color: red;")
        self.error_label.setVisible(False)
        layout.addWidget(self.error_label)

        # Buttons
        button_layout = QHBoxLayout()
        button_layout.addStretch()

        self.login_button = QPushButton("Login")
        self.login_button.setDefault(True)
        self.login_button.clicked.connect(self.accept)
        button_layout.addWidget(self.login_button)

        cancel_button = QPushButton("Cancel")
        cancel_button.clicked.connect(self.reject)
        button_layout.addWidget(cancel_button)

        layout.addLayout(button_layout)

        # Enter key handling
        self.password_input.returnPressed.connect(self.login_button.click)

    def get_credentials(self) -> tuple[str, str, str]:
        """Get entered credentials."""
        return (
            self.server_input.currentText().strip(),
            self.username_input.text().strip(),
            self.password_input.text()
        )

    def show_error(self, message: str):
        """Show error message."""
        self.error_label.setText(message)
        self.error_label.setVisible(True)

    def clear_error(self):
        """Clear error message."""
        self.error_label.setVisible(False)