feat: add abstract app module and refactor config

.gitignore

@@ -7,4 +7,5 @@ env/
 venv/
 .venv/
 .idea/
-*.egg-info
+*.egg-info
+.vscode/

ou_dedetai/app.py

@@ -0,0 +1,221 @@
+
+import abc
+import logging
+import os
+from pathlib import Path
+import sys
+import threading
+from typing import Callable, NoReturn, Optional
+
+from ou_dedetai import constants
+from ou_dedetai.constants import PROMPT_OPTION_DIRECTORY, PROMPT_OPTION_FILE
+
+
+class App(abc.ABC):
+    # FIXME: consider weighting install steps. Different steps take different lengths
+    installer_step_count: int = 0
+    """Total steps in the installer, only set the installation process has started."""
+    installer_step: int = 1
+    """Step the installer is on. Starts at 0"""
+
+    _threads: list[threading.Thread]
+    """List of threads
+
+    Non-daemon threads will be joined before shutdown
+    """
+    _last_status: Optional[str] = None
+    """The last status we had"""
+    config_updated_hooks: list[Callable[[], None]] = []
+    _config_updated_event: threading.Event = threading.Event()
+
+    def __init__(self, config, **kwargs) -> None:
+        # This lazy load is required otherwise these would be circular imports
+        from ou_dedetai.config import Config
+        from ou_dedetai.logos import LogosManager
+        from ou_dedetai.system import check_incompatibilities
+
+        self.conf = Config(config, self)
+        self.logos = LogosManager(app=self)
+        self._threads = []
+        # Ensure everything is good to start
+        check_incompatibilities(self)
+
+        def _config_updated_hook_runner():
+            while True:
+                self._config_updated_event.wait()
+                self._config_updated_event.clear()
+                for hook in self.config_updated_hooks:
+                    hook()
+        _config_updated_hook_runner.__name__ = "Config Update Hook"
+        self.start_thread(_config_updated_hook_runner, daemon_bool=True)
+
+    def ask(self, question: str, options: list[str]) -> str:
+        """Asks the user a question with a list of supplied options
+
+        Returns the option the user picked.
+
+        If the internal ask function returns None, the process will exit with 1
+        """
+        def validate_result(answer: str, options: list[str]) -> Optional[str]:
+            special_cases = set([PROMPT_OPTION_DIRECTORY, PROMPT_OPTION_FILE])
+            # These constants have special meaning, don't worry about them to start with
+            simple_options = list(set(options) - special_cases)
+            # This MUST have the same indexes as above
+            simple_options_lower = [opt.lower() for opt in simple_options]
+
+            # Case sensitive check first
+            if answer in simple_options:
+                return answer
+            # Also do a case insensitive match, no reason to fail due to casing
+            if answer.lower() in simple_options_lower:
+                # Return the correct casing to simplify the parsing of the ask result
+                return simple_options[simple_options.index(answer.lower())]
+
+            # Now check the special cases
+            if PROMPT_OPTION_FILE in options and Path(answer).is_file():
+                return answer
+            if PROMPT_OPTION_DIRECTORY in options and Path(answer).is_dir():
+                return answer
+
+            # Not valid
+            return None
+
+
+        passed_options: list[str] | str = options
+        if len(passed_options) == 1 and (
+            PROMPT_OPTION_DIRECTORY in passed_options
+            or PROMPT_OPTION_FILE in passed_options
+        ):
+            # Set the only option to be the follow up prompt
+            passed_options = options[0]
+        elif passed_options is not None and self._exit_option is not None:
+            passed_options = options + [self._exit_option]
+
+        answer = self._ask(question, passed_options)
+        while answer is None or validate_result(answer, options) is None:
+            invalid_response = "That response is not valid, please try again."
+            new_question = f"{invalid_response}\n{question}"
+            answer = self._ask(new_question, passed_options)
+
+        if answer is not None:
+            answer = validate_result(answer, options)
+            if answer is None:
+                # Huh? coding error, this should have been checked earlier
+                logging.critical("An invalid response slipped by, please report this incident to the developers") #noqa: E501
+                self.exit("Failed to get a valid value from user")
+
+        if answer == self._exit_option:
+            answer = None
+
+        if answer is None:
+            self.exit("Failed to get a valid value from user")
+
+        return answer
+
+    def approve_or_exit(self, question: str, context: Optional[str] = None):
+        """Asks the user a question, if they refuse, shutdown"""
+        if not self.approve(question, context):
+            self.exit(f"User refused the prompt: {question}")
+
+    def approve(self, question: str, context: Optional[str] = None) -> bool:
+        """Asks the user a y/n question"""
+        question = f"{context}\n" if context is not None else "" + question
+        options = ["Yes", "No"]
+        return self.ask(question, options) == "Yes"
+
+    def exit(self, reason: str, intended: bool = False) -> NoReturn:
+        """Exits the application cleanly with a reason."""
+        logging.debug(f"Closing {constants.APP_NAME}.")
+        # Shutdown logos/indexer if we spawned it
+        self.logos.end_processes()
+        # Join threads
+        for thread in self._threads:
+            # Only wait on non-daemon threads.
+            if not thread.daemon:
+                try:
+                    thread.join()
+                except RuntimeError:
+                    # Will happen if we try to join the current thread
+                    pass
+        # Remove pid file if exists
+        try:
+            os.remove(constants.PID_FILE)
+        except FileNotFoundError:  # no pid file when testing functions
+            pass
+        # exit from the process
+        if intended:
+            sys.exit(0)
+        else:
+            logging.critical(f"Cannot continue because {reason}\n{constants.SUPPORT_MESSAGE}") #noqa: E501
+            sys.exit(1)
+
+    _exit_option: Optional[str] = "Exit"
+
+    @abc.abstractmethod
+    def _ask(self, question: str, options: list[str] | str) -> Optional[str]:
+        """Implementation for asking a question pre-front end
+
+        Options may include ability to prompt for an additional value.
+        Such as asking for one of strings or a directory.
+        If the user selects choose a new directory, the
+        implementations MUST handle the follow up prompt before returning
+
+        Options may be a single value,
+        Implementations MUST handle this single option being a follow up prompt
+        """
+        raise NotImplementedError()
+
+    def is_installed(self) -> bool:
+        """Returns whether the install was successful by
+        checking if the installed exe exists and is executable"""
+        if self.conf.logos_exe is not None:
+            return os.access(self.conf.logos_exe, os.X_OK)
+        return False
+
+    def status(self, message: str, percent: Optional[int | float] = None):
+        """A status update"""
+        if isinstance(percent, float):
+            percent = round(percent * 100)
+        # If we're installing
+        if self.installer_step_count != 0:
+            current_step_percent = percent or 0
+            # We're further than the start of our current step, percent more
+            installer_percent = round((self.installer_step * 100 + current_step_percent) / self.installer_step_count) # noqa: E501
+            logging.debug(f"Install step {self.installer_step} of {self.installer_step_count}")  # noqa: E501
+            self._status(message, percent=installer_percent)
+        else:
+            # Otherwise just print status using the progress given
+            self._status(message, percent)
+        self._last_status = message
+
+    def _status(self, message: str, percent: Optional[int] = None):
+        """Implementation for updating status pre-front end"""
+        # De-dup
+        if message != self._last_status:
+            print(f"{message}")
+
+    @property
+    def superuser_command(self) -> str:
+        """Command when root privileges are needed.
+
+        Raises:
+            SuperuserCommandNotFound
+
+        May be sudo or pkexec for example"""
+        from ou_dedetai.system import get_superuser_command
+        return get_superuser_command()
+
+    def start_thread(self, task, *args, daemon_bool: bool = True, **kwargs):
+        """Starts a new thread
+
+        Non-daemon threads be joined before shutdown"""
+        thread = threading.Thread(
+            name=f"{constants.APP_NAME} {task}",
+            target=task,
+            daemon=daemon_bool,
+            args=args,
+            kwargs=kwargs
+        )
+        self._threads.append(thread)
+        thread.start()
+        return thread