import os
import subprocess
from pathlib import Path
from shutil import which


def notify(
    application_name: str,
    title: str,
    message: str,
    urgency: str = "low",
    category: str | None = None,
    icon: Path | None = None,
    desktop_entry: str | None = None,
) -> None:
    if not which("notify-send"):
        raise FileNotFoundError("notify-send is not installed.")
    args = ["notify-send", "-a", application_name, "-u", urgency]
    if category:
        args.append("-c")
        args.append(category)
    if icon:
        args.append("-i")
        args.append(str(icon))
    if desktop_entry:
        if not does_desktop_entry_exist(desktop_entry=desktop_entry):
            raise FileNotFoundError("Desktop entry does not exist.")
        args.append("-h")
        args.append(f"string:desktop-entry:{desktop_entry}")
    args.append(title)
    args.append(message)
    print(args)
    subprocess.run(args)


def read_secret_file(secret: str, home: bool = False) -> str:
    if home:
        path = os.path.expanduser(f"~/.secrets/{secret}")
    else:
        path = f"/run/secrets/{secret}"
    if not os.path.exists(path):
        raise FileNotFoundError(f"Secret file {path} does not exist or cannot be read.")
    with open(file=path, mode="r") as secret_file:
        secret = secret_file.read().strip()
    if not secret:
        raise ValueError(f"Secret file {path} is empty.")
    return secret


def does_desktop_entry_exist(desktop_entry: str, show_all_paths: bool = True) -> bool:
    if not desktop_entry:
        raise ValueError("Please provide the full filename of the desktop entry.")

    if not desktop_entry.endswith(".desktop"):
        desktop_entry += ".desktop"

    entry_paths = []

    if which("qtpaths"):
        result = subprocess.run(
            ["qtpaths", "--paths", "ApplicationsLocation"],
            stdout=subprocess.PIPE,
            text=True,
        )
        entry_paths = result.stdout.strip().split(":")
    else:
        print("qtpaths is not installed, falling back to XDG_DATA_DIRS.")
        xdg_data_dirs = os.getenv("XDG_DATA_DIRS", "/usr/share:/usr/local/share").split(
            ":"
        )
        entry_paths = [os.path.join(path, "applications") for path in xdg_data_dirs]
        entry_paths.append(os.path.expanduser("~/.local/share/applications"))

    if show_all_paths:
        print(
            f"Checking the following paths for {desktop_entry}:\n{entry_paths}\n{'-'*20}"
        )

    for entry_path in entry_paths:
        entry_file = Path(entry_path) / f"{desktop_entry}"
        if show_all_paths:
            print(f"Checking for {entry_file}")
        if entry_file.is_file():
            print(f"{desktop_entry} found in {entry_path}")
            return True

    print(f"Desktop entry {desktop_entry} does not exist.")
    return False