#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Fenrir TTY screen reader
# By Chrys, Storm Dragon, and contributors.

import time

from fenrirscreenreader.core import debug
from fenrirscreenreader.core.inputDriver import InputDriver as inputDriver


class driver(inputDriver):
    """PTY (Pseudo-terminal) input driver for Fenrir screen reader.
    
    This driver provides input handling for terminal emulation environments
    where direct device access (evdev) is not available or appropriate.
    It uses byte-based input processing instead of key event processing.
    
    This is primarily used when running Fenrir in terminal emulators,
    desktop environments, or other contexts where traditional TTY device
    access is not available.
    
    Features:
    - Byte-based input processing
    - Terminal emulation compatibility
    - Simplified input handling for non-TTY environments
    """
    def __init__(self):
        self._is_initialized = False
        inputDriver.__init__(self)

    def initialize(self, environment):
        """Initialize the PTY input driver.
        
        Sets the input manager to use byte-based shortcuts instead of
        key-based shortcuts, enabling proper operation in terminal
        emulation environments.
        
        Args:
            environment: Fenrir environment dictionary
            
        Returns:
            bool: True if initialization successful, False otherwise
        """
        try:
            if environment is None:
                raise ValueError("Environment cannot be None")
                
            self.env = environment
            
            # Validate required managers are available
            if "runtime" not in self.env:
                raise ValueError("Runtime environment missing")
            if "InputManager" not in self.env["runtime"]:
                raise ValueError("InputManager not available")
                
            self.env["runtime"]["InputManager"].set_shortcut_type("BYTE")
            self._is_initialized = True
            
            self.env["runtime"]["DebugManager"].write_debug_out(
                "PTY inputDriver: Initialized with byte-based shortcuts",
                debug.DebugLevel.INFO
            )
            return True
            
        except Exception as e:
            # Log error if possible, otherwise fallback to print
            try:
                if hasattr(self, 'env') and self.env and "runtime" in self.env:
                    self.env["runtime"]["DebugManager"].write_debug_out(
                        f"PTY inputDriver: Initialization failed: {e}",
                        debug.DebugLevel.ERROR
                    )
                else:
                    print(f"PTY inputDriver initialization error: {e}")
            except:
                print(f"PTY inputDriver initialization error: {e}")
            
            self._is_initialized = False
            return False

    def shutdown(self):
        """Shutdown the PTY input driver.
        
        Performs cleanup operations when the driver is being stopped.
        For PTY driver, this involves cleaning up any resources and
        logging the shutdown.
        """
        if not self._is_initialized:
            return
            
        try:
            self.env["runtime"]["DebugManager"].write_debug_out(
                "PTY inputDriver: Shutting down",
                debug.DebugLevel.INFO
            )
        except Exception as e:
            # Fallback logging if debug manager is unavailable
            print(f"PTY inputDriver shutdown error: {e}")
        finally:
            self._is_initialized = False

    def get_input_event(self):
        """Get input event from PTY.
        
        For PTY driver, input events are handled through the byte-based
        shortcut system rather than direct device events. This method
        returns None as PTY input is processed through the screen driver
        and InputManager's byte processing.
        
        Returns:
            None: PTY driver uses byte-based processing, not event-based
        """
        return None

    def is_device_connected(self):
        """Check if PTY input device is connected.
        
        For PTY driver, the "device" is the terminal interface itself,
        which is considered connected if the driver is initialized.
        
        Returns:
            bool: True if driver is initialized, False otherwise
        """
        return self._is_initialized

    def get_device_name(self):
        """Get the name of the PTY input device.
        
        Returns:
            str: Human-readable name of the PTY input device
        """
        return "PTY (Pseudo-terminal) Input"

    def grab_devices(self, grab=True):
        """Grab or release input devices.
        
        For PTY driver, device grabbing is not applicable since input
        is processed through terminal emulation rather than direct
        device access.
        
        Args:
            grab (bool): Whether to grab (True) or release (False) devices
            
        Returns:
            bool: Always returns True for PTY driver (no-op success)
        """
        if not self._is_initialized:
            return False
            
        action = "grab" if grab else "release"
        self.env["runtime"]["DebugManager"].write_debug_out(
            f"PTY inputDriver: {action} devices (no-op for PTY)",
            debug.DebugLevel.INFO
        )
        return True

    def has_device_detection(self):
        """Check if driver supports device detection.
        
        PTY driver does not support dynamic device detection since
        it operates on the terminal interface directly.
        
        Returns:
            bool: Always False for PTY driver
        """
        return False

    def get_device_list(self):
        """Get list of available input devices.
        
        For PTY driver, there is only one logical device - the terminal
        interface itself.
        
        Returns:
            list: Single-item list containing PTY device info
        """
        if not self._is_initialized:
            return []
            
        return [{
            'name': 'PTY Terminal',
            'path': '/dev/pts/*',
            'type': 'terminal',
            'connected': True
        }]

    def get_led_state(self, led_mask=None):
        """Get LED state information.
        
        PTY driver cannot access LED states since it operates through
        terminal emulation rather than direct hardware access.
        
        Args:
            led_mask: LED mask parameter (ignored for PTY)
        
        Returns:
            dict: Empty dict (no LED access for PTY)
        """
        return {}

    def set_led_state(self, led_dict):
        """Set LED states.
        
        PTY driver cannot control LEDs since it operates through
        terminal emulation rather than direct hardware access.
        
        Args:
            led_dict (dict): LED state dictionary (ignored for PTY)
            
        Returns:
            bool: Always False (LED control not supported)
        """
        return False
