"""The virtual monitor half: a headless Hyprland output sized to the tablet."""

import json
import re
import shutil
import subprocess
import sys
import time
from pathlib import Path


def run(cmd, timeout=2):
    try:
        return subprocess.run(cmd, capture_output=True, text=True, timeout=timeout).stdout.strip()
    except (OSError, subprocess.TimeoutExpired):
        return ""


def tablet_resolution(cfg: dict, adb=None) -> str:
    res = cfg.get("display", {}).get("resolution", "auto")
    if res != "auto":
        return res
    read = adb or (lambda: run(["adb", "shell", "wm", "size"]))
    m = re.search(r"(\d+)x(\d+)", read())
    if not m:
        sys.exit("Could not read the tablet resolution; set display.resolution in the config")
    w, h = sorted(map(int, m.groups()), reverse=True)
    return f"{w}x{h}"


def hypr_lua(cfg: dict) -> bool:
    mode = cfg.get("hyprland", "auto")
    if mode == "auto":
        return (Path.home() / ".config/hypr/hyprland.lua").is_file()
    return mode == "lua"


def setup_display(cfg: dict, run_cmd=None) -> None:
    run_cmd = run_cmd or run
    d = cfg.get("display", {})
    mon = d.get("name", "TAB")
    monitors = json.loads(run_cmd(["hyprctl", "monitors", "-j"]) or "[]")
    if not any(m["name"] == mon for m in monitors):
        run_cmd(["hyprctl", "output", "create", "headless", mon])
        time.sleep(1)
    mode = f"{tablet_resolution(cfg)}@{d.get('refresh', 60)}"
    pos = d.get("position", "auto-right")
    scale = d.get("scale", 1)
    if hypr_lua(cfg):
        run_cmd(["hyprctl", "eval",
                 f'hl.monitor({{output="{mon}", mode="{mode}", position="{pos}", scale={scale}}})'])
    else:
        run_cmd(["hyprctl", "keyword", "monitor", f"{mon},{mode},{pos},{scale}"])
    tool = shutil.which("awww") or shutil.which("swww")
    if d.get("wallpaper", True) and tool:
        others = [m["name"] for m in monitors if m["name"] != mon]
        for line in run_cmd([tool, "query"]).splitlines():
            if others and others[0] in line and "image: " in line:
                run_cmd([tool, "img", "-o", mon, line.split("image: ", 1)[1]], timeout=10)
                break
    print(f"{mon}: {mode} at {pos}")