# ~/.config/kitty/mywatcher.py
from kitty.tabs import TabManager
from typing import Any

from kitty.boss import Boss
from kitty.window import Window

# from pprint import pprint

# Kitty currently ships with Python 3.12, but os.ptsname was added in 3.13.
import ctypes

libc = ctypes.CDLL("libc.so.6")
libc.ptsname.restype = ctypes.c_char_p

updating = False


def get_title(window: Window, title: str) -> str:
    vt = "n/a"
    try:
        vt = window.user_vars["vt"]
    except KeyError:
        pass

    ptsname = libc.ptsname(window.child.child_fd).decode()
    ptsname = ptsname.removeprefix("/dev/")

    return f"{title} [{vt} {ptsname}]"


def on_title_change(boss: Boss, window: Window, data: dict[str, Any]) -> None:
    # pprint(("title change", "window", window, "data", data))
    tm = boss.active_tab_manager_with_dispatch
    if tm is not None:
        update_title(boss, window, tm)


def on_tab_bar_dirty(boss: Boss, window: Window, data: dict[str, Any]) -> None:
    # called when any changes happen to the tab bar, such a new tabs being
    # created, tab titles changing, tabs moving, etc. Useful to display the
    # tab bar externally to kitty. This is called even if the tab bar is
    # hidden. Note that this is called only in *global watchers*, that is
    # watchers defined in kitty.conf or using the --watcher command line
    # flag. data contains tab_manager which is the object responsible for
    # managing all tabs in a single OS Window.
    # return get_title(window, data["title"])
    tm = data["tab_manager"]
    update_title(boss, window, tm)


def update_title(boss: Boss, window: Window, tm: TabManager) -> None:
    # pprint(("update title", "window", window))
    global updating

    if updating:
        # pprint("already updating, skipping")
        return

    tab = tm.active_tab
    if tab is None:
        return

    title = get_title(window, window.child_title)
    if title != tab.effective_title:
        updating = True
        # pprint(
        #     (
        #         "title",
        #         title,
        #         "tab.effective title",
        #         tab.effective_title,
        #         "window.title",
        #         window.title,
        #         "window.child_title",
        #         window.child_title,
        #     )
        # )
        window.set_title(title)
        updating = False
    else:
        pass
        # pprint(
        #     (
        #         "no update",
        #         "title",
        #         title,
        #         "tab.effective title",
        #         tab.effective_title,
        #         "window.title",
        #         window.title,
        #         "window.child_title",
        #         window.child_title,
        #     )
        # )

    return