#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import cme
import importlib
import traceback
import sys

from os import listdir
from os.path import dirname
from os.path import join as path_join

from cme.context import Context
from cme.logger import CMEAdapter
from cme.paths import CME_PATH


class ModuleLoader:
    def __init__(self, args, db, logger):
        self.args = args
        self.db = db
        self.logger = logger

    def module_is_sane(self, module, module_path):
        """
        Check if a module has the proper attributes
        """
        module_error = False
        if not hasattr(module, "name"):
            self.logger.fail(f"{module_path} missing the name variable")
            module_error = True
        elif not hasattr(module, "description"):
            self.logger.fail(f"{module_path} missing the description variable")
            module_error = True
        elif not hasattr(module, "supported_protocols"):
            self.logger.fail(f"{module_path} missing the supported_protocols variable")
            module_error = True
        elif not hasattr(module, "opsec_safe"):
            self.logger.fail(f"{module_path} missing the opsec_safe variable")
            module_error = True
        elif not hasattr(module, "multiple_hosts"):
            self.logger.fail(f"{module_path} missing the multiple_hosts variable")
            module_error = True
        elif not hasattr(module, "options"):
            self.logger.fail(f"{module_path} missing the options function")
            module_error = True
        elif not hasattr(module, "on_login") and not (module, "on_admin_login"):
            self.logger.fail(f"{module_path} missing the on_login/on_admin_login function(s)")
            module_error = True
        # elif not hasattr(module, 'chain_support'):
        #    self.logger.fail('{} missing the chain_support variable'.format(module_path))
        #    module_error = True

        if module_error:
            return False
        return True

    def load_module(self, module_path):
        """
        Load a module, initializing it and checking that it has the proper attributes
        """
        try:
            spec = importlib.util.spec_from_file_location("CMEModule", module_path)
            module = spec.loader.load_module().CMEModule()

            if self.module_is_sane(module, module_path):
                return module
        except Exception as e:
            self.logger.fail(f"Failed loading module at {module_path}: {e}")
            self.logger.debug(traceback.format_exc())
        return None

    def init_module(self, module_path):
        """
        Initialize a module for execution
        """
        module = None
        module = self.load_module(module_path)

        if module:
            self.logger.debug(f"Supported protocols: {module.supported_protocols}")
            self.logger.debug(f"Protocol: {self.args.protocol}")
            if self.args.protocol in module.supported_protocols:
                try:
                    module_logger = CMEAdapter(extra={"module_name": module.name.upper()})
                except Exception as e:
                    self.logger.fail(f"Error loading CMEAdaptor for module {module.name.upper()}: {e}")
                context = Context(self.db, module_logger, self.args)
                module_options = {}

                for option in self.args.module_options:
                    key, value = option.split("=", 1)
                    module_options[str(key).upper()] = value

                module.options(context, module_options)
                return module
            else:
                self.logger.fail(f"Module {module.name.upper()} is not supported for protocol {self.args.protocol}")
                sys.exit(1)

    def get_module_info(self, module_path):
        """
        Get the path, description, and options from a module
        """
        try:
            spec = importlib.util.spec_from_file_location("CMEModule", module_path)
            module_spec = spec.loader.load_module().CMEModule

            module = {
                f"{module_spec.name.lower()}": {
                    "path": module_path,
                    "description": module_spec.description,
                    "options": module_spec.options.__doc__,
                    "supported_protocols": module_spec.supported_protocols,
                    "opsec_safe": module_spec.opsec_safe,
                    "multiple_hosts": module_spec.multiple_hosts,
                }
            }
            if self.module_is_sane(module_spec, module_path):
                return module
        except Exception as e:
            self.logger.fail(f"Failed loading module at {module_path}: {e}")
            self.logger.debug(traceback.format_exc())
        return None

    def list_modules(self):
        """
        List modules without initializing them
        """
        modules = {}
        modules_paths = [
            path_join(dirname(cme.__file__), "modules"),
            path_join(CME_PATH, "modules"),
        ]

        for path in modules_paths:
            for module in listdir(path):
                if module[-3:] == ".py" and module != "example_module.py":
                    try:
                        module_path = path_join(path, module)
                        module_data = self.get_module_info(module_path)
                        modules.update(module_data)
                    except:
                        pass
        return modules