# Copyright (C) 2010-2024 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

import os
import shutil
import logging
import textwrap

import pytest

import rhodecode
import rhodecode.lib

from rhodecode.tests import console_printer

log = logging.getLogger(__name__)


def store_rcextensions(destination, force=False):
    from rhodecode.config import rcextensions
    package_path = rcextensions.__path__[0]

    # Note: rcextensions are looked up based on the path of the ini file
    rcextensions_path = os.path.join(destination, 'rcextensions')

    if force:
        shutil.rmtree(rcextensions_path, ignore_errors=True)
    shutil.copytree(package_path, rcextensions_path)


@pytest.fixture(scope="module")
def rcextensions(request, tmp_storage_location):
    """
    Installs a testing rcextensions pack to ensure they work as expected.
    """

    # Note: rcextensions are looked up based on the path of the ini file
    rcextensions_path = os.path.join(tmp_storage_location, 'rcextensions')

    if os.path.exists(rcextensions_path):
        pytest.fail(
            f"Path for rcextensions already exists, please clean up before "
            f"test run this path: {rcextensions_path}")
    else:
        store_rcextensions(tmp_storage_location)


@pytest.fixture(scope='function')
def rcextensions_present(request):

    class RcExtensionsPresent:
        def __init__(self, rcextensions_location):
            self.rcextensions_location = rcextensions_location

        def __enter__(self):
            self.store()

        def __exit__(self, exc_type, exc_val, exc_tb):
            self.cleanup()

        def store(self):
            store_rcextensions(self.rcextensions_location)

        def cleanup(self):
            shutil.rmtree(os.path.join(self.rcextensions_location, 'rcextensions'))

    return RcExtensionsPresent


@pytest.fixture(scope='function')
def rcextensions_modification(request):
    """
    example usage::

        hook_name = '_pre_push_hook'
        code = '''
        raise OSError('failed')
        return HookResponse(1, 'FAILED')
        '''
        mods = [
            (hook_name, code),
        ]
        # rhodecode.ini file location, where rcextensions needs to live
        rcstack_location = os.path.dirname(rcstack.config_file)
        with rcextensions_modification(rcstack_location, mods):
            # do some stuff
    """

    class RcextensionsModification:
        def __init__(self, rcextensions_location, mods, create_if_missing=False, force_create=False):
            self.force_create = force_create
            self.create_if_missing = create_if_missing
            self.rcextensions_location = rcextensions_location
            self.mods = mods
            if not isinstance(mods, list):
                raise ValueError('mods must be a list of modifications')

        def __enter__(self):
            if self.create_if_missing:
                store_rcextensions(self.rcextensions_location, force=self.force_create)

            for hook_name, method_body in self.mods:
                self.modification(hook_name, method_body)

        def __exit__(self, exc_type, exc_val, exc_tb):
            self.cleanup()

        def cleanup(self):
            # reset rcextensions to "bare" state from the package
            store_rcextensions(self.rcextensions_location, force=True)

        def modification(self, hook_name, method_body):
            import ast

            rcextensions_path = os.path.join(self.rcextensions_location, 'rcextensions')

            # Load the code from hooks.py
            hooks_filename = os.path.join(rcextensions_path, 'hooks.py')
            with open(hooks_filename, "r") as file:
                tree = ast.parse(file.read())

            # Define new content for the function as a string
            new_code = textwrap.dedent(method_body)

            # Parse the new code to add it to the function
            new_body = ast.parse(new_code).body

            # Walk through the AST to find and modify the function
            for node in tree.body:
                if isinstance(node, ast.FunctionDef) and node.name == hook_name:
                    node.body = new_body  # Replace the function body with the new body

            # Compile the modified AST back to code
            compile(tree, hooks_filename, "exec")

            # Write the updated code back to hooks.py
            with open(hooks_filename, "w") as file:
                file.write(ast.unparse(tree))  # Requires Python 3.9+

            console_printer(f" [green]rcextensions[/green] Updated the body of '{hooks_filename}' function '{hook_name}'")

    return RcextensionsModification