#!/usr/bin/env python
#
# Generate the PyConnection wrapper for a Python class.

import sys
import os

INTERFACE_TEMPLATE = """
package %(package)s;

public interface %(pyClassName)sType {
    // write the public interface for the Python
    // class '%(pyClassName)s' here.
}
"""

FACTORY_TEMPLATE = """
package %(package)s;

import pyconnection.PyFactory;

public class %(pyClassName)sFactory extends PyFactory {

	public %(pyClassName)sFactory() {
		super("%(package)s.%(pyClassName)sType", "%(pyClassName)s");
	}

	public %(pyClassName)sType create(Object... objects) {
		return (%(pyClassName)sType)super.create(objects);
	}
}
"""

def check_location(pyClassName):
    """
    Check whether the directory contains a Python file with the name
    of the class.
    """
    try:
        file('%s.py' %pyClassName)
    except IOError:
        print "Couldn't find Python file: %s.py" %pyClassName
        sys.exit(1)

def make_java_project_dir(javaProjectName, pyClassName):
    """
    Create the java project directory structure, if it does not exist.
    """
    try:
        cwd = os.getcwd()
        os.chdir(os.pardir)
        package_dir = os.path.join(javaProjectName,
                                   'src',
                                   pyClassName.lower())
        os.makedirs(package_dir)
        python_dir = os.path.join(javaProjectName, 'src/python')
        os.symlink(cwd, python_dir)

        package = pyClassName.lower()
        iface_src = INTERFACE_TEMPLATE %locals()
        factory_src = FACTORY_TEMPLATE %locals()

        iface_file = file(os.path.join(package_dir, pyClassName+'Type.java'), 'w')
        factory_file = file(os.path.join(package_dir, pyClassName+'Factory.java'), 'w')

        iface_file.write(iface_src)
        factory_file.write(factory_src)

        iface_file.close()
        factory_file.close()
        
    except OSError, e:
        if e.errno != 17:       # ignore if some directory already exists
            raise
    finally:
        os.chdir(cwd)


if __name__ == '__main__':
    if len(sys.argv) != 3:
        print 'Usage: %s <Python class name> <Java project name>' %sys.argv[0]
        sys.exit(1)

    pyClassName = sys.argv[1]
    javaProjectName = sys.argv[2]

    check_location(pyClassName)
    make_java_project_dir(javaProjectName, pyClassName)