"""
detect_platform.py — Inkscape config-path detection, cross-platform.

Shared by install.py and uninstall.py.
"""
from __future__ import annotations

import os
import platform
import subprocess
from pathlib import Path


def _cmd_contains(cmd: list[str], pattern: str) -> bool:
    """Run *cmd*; return True if stdout contains *pattern*."""
    try:
        result = subprocess.run(
            cmd, capture_output=True, text=True, timeout=5
        )
        return pattern in result.stdout
    except (FileNotFoundError, subprocess.TimeoutExpired):
        return False


def detect_config() -> tuple[Path, str]:
    """
    Return (inkscape_config_path, install_method).

    install_method is one of: "flatpak", "snap", "native", "store"
    """
    system = platform.system()
    if system == "Windows":
        return _detect_windows()
    if system == "Darwin":
        return _detect_macos()
    return _detect_linux()


def _detect_linux() -> tuple[Path, str]:
    # Flatpak takes priority — most common modern Linux install
    flatpak_config = Path.home() / ".var/app/org.inkscape.Inkscape/config/inkscape"
    if flatpak_config.is_dir() or _cmd_contains(
        ["flatpak", "list"], "org.inkscape.Inkscape"
    ):
        return flatpak_config, "flatpak"

    # Snap
    snap_config = Path.home() / "snap/inkscape/current/.config/inkscape"
    if snap_config.is_dir() or _cmd_contains(["snap", "list"], "inkscape"):
        return snap_config, "snap"

    # Native / XDG
    xdg = Path(os.environ.get("XDG_CONFIG_HOME", Path.home() / ".config")) / "inkscape"
    return xdg, "native"


def _detect_macos() -> tuple[Path, str]:
    # App Bundle (DMG install) stores config under ~/Library/Application Support
    app_support = (
        Path.home()
        / "Library/Application Support/org.inkscape.Inkscape/config/inkscape"
    )
    if app_support.is_dir():
        return app_support, "native"
    # Homebrew / XDG fallback
    xdg = Path(os.environ.get("XDG_CONFIG_HOME", Path.home() / ".config")) / "inkscape"
    return xdg, "native"


def _detect_windows() -> tuple[Path, str]:
    # MS Store — glob for the Packages directory
    local_appdata = os.environ.get("LOCALAPPDATA", "")
    if local_appdata:
        packages = Path(local_appdata) / "Packages"
        if packages.is_dir():
            matches = list(packages.glob("org.inkscape.Inkscape*"))
            if matches:
                return matches[0] / "LocalCache/Roaming/inkscape", "store"

    # Native (winget / Scoop / chocolatey / official installer)
    appdata = Path(os.environ.get("APPDATA", Path.home() / "AppData/Roaming"))
    return appdata / "inkscape", "native"