from PyQt6.QtWidgets import QWidget, QVBoxLayout, QTextEdit, QPushButton, QLabel, QMessageBox, QHBoxLayout
from PyQt6.QtCore import Qt, QThread, pyqtSignal
import smtplib, os
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from dotenv import load_dotenv
from app.core.main_manager import MainManager, NotificationType
from typing import Optional

# Load environment variables from .env file
load_dotenv()

class EmailSender(QThread):
    success = pyqtSignal()
    error = pyqtSignal(str)
    
    def __init__(self, subject: str, message: str) -> None:
        super().__init__()
        self.subject: str = subject
        self.message: str = message
    
    def run(self) -> None:
        try:
            # Get email configuration from environment variables
            email: Optional[str] = os.getenv('EMAIL_ADDRESS')
            password: Optional[str] = os.getenv('EMAIL_PASSWORD')
            smtp_server: str = os.getenv('EMAIL_SMTP_SERVER', 'smtp.gmail.com')
            smtp_port: int = int(os.getenv('EMAIL_SMTP_PORT', '587'))

            if not email or not password:
                self.error.emit("password")
                return
            
            # Create message
            msg: MIMEMultipart = MIMEMultipart()
            msg['From'] = email
            msg['To'] = email
            msg['Subject'] = self.subject
            
            # Add body to email
            msg.attach(MIMEText(self.message, 'plain'))
            
            # Create SMTP session
            server: smtplib.SMTP = smtplib.SMTP(smtp_server, smtp_port)
            server.starttls()  # Enable TLS encryption
            # Login with app password
            server.login(email, password)
            # Send email
            text: str = msg.as_string()
            server.sendmail(email, email, text)
            server.quit()
            self.success.emit()
        except smtplib.SMTPAuthenticationError:
            self.error.emit("email_credentials_error")
        except Exception:
            self.error.emit("suggestion_send_error")

class SuggestionWindow(QWidget):
    def __init__(self, parent: Optional[QWidget] = None) -> None:
        super().__init__(parent)
        self.main_manager: MainManager = MainManager.get_instance()
        self.language_manager = self.main_manager.get_language_manager()
        self.settings_manager = self.main_manager.get_settings_manager()
        self.alert_manager = self.main_manager.get_alert_manager()

        self.observer_manager = self.main_manager.get_observer_manager()
        self.observer_manager.subscribe(NotificationType.LANGUAGE, self.update_language)
        
        self.email_sender: Optional[EmailSender] = None
        
        self.setup_ui()

    def setup_ui(self) -> None:
        layout: QVBoxLayout = QVBoxLayout(self)
        layout.setAlignment(Qt.AlignmentFlag.AlignTop)
        layout.setSpacing(20)
        layout.setContentsMargins(20, 20, 20, 20)

        # Title
        self.title_label: QLabel = QLabel(self.language_manager.get_text("suggestion_text"), self)
        self.title_label.setStyleSheet("font-size: 18px; font-weight: bold; margin-bottom: 10px;")
        self.title_label.setWordWrap(True)  # Permet le retour à la ligne automatique
        self.title_label.setSizePolicy(self.title_label.sizePolicy().horizontalPolicy(), 
                                      self.title_label.sizePolicy().verticalPolicy())
        layout.addWidget(self.title_label)

        # Text area for suggestion
        self.text_edit: QTextEdit = QTextEdit(self)
        self.text_edit.setPlaceholderText(self.language_manager.get_text("suggestion_placeholder"))
        self.text_edit.setMinimumHeight(200)
        layout.addWidget(self.text_edit)

        # Button layout
        button_layout: QHBoxLayout = QHBoxLayout()
        button_layout.addStretch()

        # Send button
        self.send_button: QPushButton = QPushButton(self.language_manager.get_text("send_suggestion"), self)
        self.send_button.clicked.connect(self.send_suggestion)
        button_layout.addWidget(self.send_button)

        layout.addLayout(button_layout)
        layout.addStretch()

    def send_suggestion(self) -> None:
        message: str = self.text_edit.toPlainText().strip()
        
        if len(message)<15:
            self.alert_manager.show_error("suggestion_too_short")
            return

        # Disable send button during sending
        self.send_button.setEnabled(False)
        self.send_button.setText(self.language_manager.get_text("sending"))

        # Create subject with app name
        subject: str = f"Suggestion pour {self.settings_manager.get_config('app_name')}"
        
        # Create and start email sender thread
        self.email_sender = EmailSender(subject, message)
        self.email_sender.success.connect(self.on_email_sent)
        self.email_sender.error.connect(self.on_email_error)
        self.email_sender.start()

    def on_email_sent(self) -> None:
        self.send_button.setEnabled(True)
        self.send_button.setText(self.language_manager.get_text("send_suggestion"))
        self.alert_manager.show_success("suggestion_sent_success")
        self.text_edit.clear()

    def on_email_error(self, error: str) -> None:
        self.send_button.setEnabled(True)
        self.send_button.setText(self.language_manager.get_text("send_suggestion"))
        self.alert_manager.show_error(error)

    def update_language(self) -> None:
        self.title_label.setText(self.language_manager.get_text("suggestion_text"))
        self.text_edit.setPlaceholderText(self.language_manager.get_text("suggestion_placeholder"))
        self.send_button.setText(self.language_manager.get_text("send_suggestion"))