import os
from launch import LaunchDescription
from launch.actions import IncludeLaunchDescription
from launch.launch_description_sources import PythonLaunchDescriptionSource
from launch_ros.actions import Node
from launch.substitutions import Command
from ament_index_python.packages import get_package_share_directory

def generate_launch_description():
    pkg_dir = get_package_share_directory('agv_pro_description')
    xacro_file = os.path.join(pkg_dir, 'urdf', 'minimal_robot.xacro')
    world_file = os.path.join(pkg_dir, 'worlds', 'empty.world')

    robot_description = {'robot_description': Command(['xacro ', xacro_file])}

    return LaunchDescription([
        IncludeLaunchDescription(
            PythonLaunchDescriptionSource(
                os.path.join(get_package_share_directory('gazebo_ros'), 'launch', 'gazebo.launch.py')
            ),
            launch_arguments={'world': world_file}.items()
        ),
        Node(
            package='robot_state_publisher',
            executable='robot_state_publisher',
            parameters=[robot_description],
            output='screen'
        ),
        Node(
            package='gazebo_ros',
            executable='spawn_entity.py',
            arguments=['-topic', 'robot_description', '-entity', 'minimal_bot'],
            output='screen'
        )
    ])