#!/usr/bin/env python3
import configparser
import json
import os
import pathlib
import shlex

SEARCH_DIRS = [
    "/usr/share/wayland-sessions",
    "/usr/local/share/wayland-sessions",
    os.path.expanduser("~/.local/share/wayland-sessions"),
    "/usr/share/xsessions",
    "/usr/local/share/xsessions",
    os.path.expanduser("~/.local/share/xsessions"),
]

def clean_exec(exec_string: str):
    parts = shlex.split(exec_string)
    out = []

    for part in parts:
        if part == "%%":
            out.append("%")
        elif part.startswith("%"):
            # ignore desktop-entry field codes for login sessions
            continue
        else:
            out.append(part)

    return out

def truthy(value: str) -> bool:
    return value.strip().lower() in {"1", "true", "yes"}

sessions = []

for directory in SEARCH_DIRS:
    kind = "wayland" if "wayland-sessions" in directory else "x11"
    base = pathlib.Path(directory)

    if not base.is_dir():
        continue

    for file in sorted(base.glob("*.desktop")):
        parser = configparser.ConfigParser(interpolation=None, strict=False)
        parser.read(file, encoding="utf-8")

        if "Desktop Entry" not in parser:
            continue

        entry = parser["Desktop Entry"]

        if entry.get("Type", "Application") != "Application":
            continue
        if truthy(entry.get("Hidden", "false")):
            continue
        if truthy(entry.get("NoDisplay", "false")):
            continue

        exec_string = entry.get("Exec", "").strip()
        if not exec_string:
            continue

        sessions.append({
            "id": file.stem,
            "name": entry.get("Name", file.stem),
            "comment": entry.get("Comment", ""),
            "icon": entry.get("Icon", ""),
            "kind": kind,
            "desktopFile": str(file),
            "command": clean_exec(exec_string),
        })

print(json.dumps(sessions))