import collections
import logging
import os
import subprocess
import sys
from pathlib import Path

logger = logging.getLogger(__name__)
logger.setLevel(logging.ERROR)

CONFIG_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "config")
CONFIG = os.path.join(CONFIG_DIR, "app.yaml")

THIRD_PARTY = os.path.join(os.path.dirname(os.path.abspath(__file__)), "libs")
CACHE_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "cache")
PYTHON_PATH = None
SUBPROCESS_DIR = None


rtypes = []


def load_config():
    import yaml

    try:
        with open(CONFIG, 'r') as config_file:
            return yaml.safe_load(config_file)
    except FileNotFoundError:
        logger.info("no config")
        return {}


def save_config(config):
    import yaml

    logger.info("saving config")
    with open(CONFIG, 'w') as outfile:
        yaml.dump(config, outfile, default_flow_style=False)


def module_can_be_imported(name):
    try:
        __import__(name)
        return True
    except ModuleNotFoundError:
        return False


def get_package_install_directory():
    for path in sys.path:
        if os.path.basename(path) in ("dist-packages", "site-packages"):
            return path


def install_pip():
    # pip can not necessarily be imported into Blender after this
    get_pip_path = Path(__file__).parent / "libs" / "get-pip.py"
    subprocess.run([str(PYTHON_PATH), str(get_pip_path)], cwd=SUBPROCESS_DIR)


def install_package(name):
    target = get_package_install_directory()

    subprocess.run([str(PYTHON_PATH), "-m", "pip", "install",
                    name, '--target', target], cwd=SUBPROCESS_DIR)


def setup(dependencies, python_path):
    global PYTHON_PATH, SUBPROCESS_DIR

    PYTHON_PATH = Path(python_path)
    SUBPROCESS_DIR = PYTHON_PATH.parent

    if not module_can_be_imported("pip"):
        install_pip()

    for module_name, package_name in dependencies:
        if not module_can_be_imported(module_name):
            install_package(package_name)