"""
Remote debugging support.

This addon allows you to use a remote Python debugger with PyCharm, PyDev and
possibly other IDEs. As it is, without modification, it only supports PyCharm,
but it may work by pointing it at a similar egg file shipped with PyDev.

Before using, point the addon to your pycharm-debug-py3k.egg file in the
addon preferences screen.

For more information on how to use this addon, please read my article at
http://code.blender.org/2015/10/debugging-python-code-with-pycharm/
"""

bl_info = {
    'name': 'Remote debugger',
    'author': 'Sybren A. Stüvel',
    'version': (0, 4),
    'blender': (2, 80, 0),
    'location': 'Press [Space], search for "debugger"',
    'category': 'Development',
}

import bpy
import os.path
from bpy.types import AddonPreferences
from bpy.props import StringProperty


# Get references to all property definition functions in bpy.props,
# so that they can be used to replace 'x = IntProperty()' to 'x: IntProperty()'
# dynamically when working on Blender 2.80+
__all_prop_funcs = {
    getattr(bpy.props, propname)
    for propname in dir(bpy.props)
    if propname.endswith('Property')
}

def convert_properties(class_):
    """Class decorator to avoid warnings in Blender 2.80+

    This decorator replaces property definitions like this:

        someprop = bpy.props.IntProperty()

    to annotations, as introduced in Blender 2.80:

        someprop: bpy.props.IntProperty()

    No-op if running on Blender 2.79 or older.
    """

    if bpy.app.version < (2, 80):
        return class_

    if not hasattr(class_, '__annotations__'):
        class_.__annotations__ = {}

    attrs_to_delete = []
    for name, value in class_.__dict__.items():
        if not isinstance(value, tuple) or len(value) != 2:
            continue

        prop_func, kwargs = value
        if prop_func not in __all_prop_funcs:
            continue

        # This is a property definition, replace it with annotation.
        attrs_to_delete.append(name)
        class_.__annotations__[name] = value

    for attr_name in attrs_to_delete:
        delattr(class_, attr_name)

    return class_


def addon_preferences(context):
    try:
        preferences = context.preferences
    except AttributeError:
        # Old (<2.80) location of user preferences
        preferences = context.user_preferences

    return preferences.addons[__name__].preferences


@convert_properties
class DebuggerAddonPreferences(AddonPreferences):
    # this must match the addon name, use '__package__'
    # when defining this in a submodule of a python package.
    bl_idname = __name__

    eggpath = StringProperty(
        name='Path of the PyCharm egg file',
        description='Make sure you select the py3k egg',
        subtype='FILE_PATH',
        default='pycharm-debug-py3k.egg'
    )

    pydevpath = StringProperty(
        name='Path of the PyDev pydevd.py file',
        subtype='FILE_PATH',
        default='pydevd.py'
    )

    def draw(self, context):
        layout = self.layout
        layout.prop(self, 'pydevpath')
        layout.prop(self, 'eggpath')
        layout.label(text='Make sure you select the egg for Python 3.x: pycharm-debug-py3k.egg ')


class DEBUG_OT_connect_debugger_pycharm(bpy.types.Operator):
    bl_idname = 'debug.connect_debugger_pycharm'
    bl_label = 'Connect to remote PyCharm debugger'
    bl_description = 'Connects to a PyCharm debugger on localhost:1090'

    def execute(self, context):
        import sys

        addon_prefs = addon_preferences(context)
        eggpath = os.path.abspath(addon_prefs.eggpath)

        if not os.path.exists(eggpath):
            self.report({'ERROR'}, 'Unable to find debug egg at %r. Configure the addon properties '
                                   'in the User Preferences menu.' % eggpath)
            return {'CANCELLED'}

        if not any('pycharm-debug' in p for p in sys.path):
            sys.path.append(eggpath)

        import pydevd
        pydevd.settrace('localhost', port=1090, stdoutToServer=True, stderrToServer=True,
                        suspend=False)

        return {'FINISHED'}


class DEBUG_OT_connect_debugger_pydev(bpy.types.Operator):
    bl_idname = 'debug.connect_debugger_pydev'
    bl_label = 'Connect to remote PyDev debugger'
    bl_description = 'Connects to a PyDev debugger on localhost:5678'

    def execute(self, context):
        import sys

        addon_prefs = addon_preferences(context)
        pydevpath = os.path.abspath(addon_prefs.pydevpath)

        if not os.path.exists(pydevpath):
            self.report({'ERROR'}, 'Unable to find pydevd.py at %r. Configure the addon properties '
                                   'in the User Preferences menu.' % pydevpath)
            return {'CANCELLED'}

        dirname = os.path.dirname(pydevpath)
        basename = os.path.basename(dirname)
        if not any(basename in p for p in sys.path):
            sys.path.append(dirname)

        import pydevd
        pydevd.settrace('localhost', port=5678, stdoutToServer=True, stderrToServer=True,
                        suspend=False)

        return {'FINISHED'}


def register():
    bpy.utils.register_class(DEBUG_OT_connect_debugger_pycharm)
    bpy.utils.register_class(DEBUG_OT_connect_debugger_pydev)
    bpy.utils.register_class(DebuggerAddonPreferences)


def unregister():
    bpy.utils.unregister_class(DEBUG_OT_connect_debugger_pycharm)
    bpy.utils.unregister_class(DEBUG_OT_connect_debugger_pydev)
    bpy.utils.unregister_class(DebuggerAddonPreferences)


if __name__ == '__main__':
    register()