"""
modules/app_scheduler.py — Phase 4: Scheduled app launching (Windows Task Scheduler).

Creates a one-time task using schtasks for the current user.
"""

from __future__ import annotations

import datetime as _dt
import subprocess
from dataclasses import dataclass


@dataclass(frozen=True, slots=True)
class SchedResult:
    ok: bool
    message: str


def schedule_run(task_name: str, exe: str, when: _dt.datetime) -> SchedResult:
    tn = (task_name or "").strip() or "FRIDAY_RunApp"
    cmd = (exe or "").strip()
    if not cmd:
        return SchedResult(False, "Missing executable.")
    # schtasks expects HH:MM (24h) and date MM/DD/YYYY
    st = when.strftime("%H:%M")
    sd = when.strftime("%m/%d/%Y")
    p = subprocess.run(
        ["schtasks", "/Create", "/SC", "ONCE", "/TN", tn, "/TR", cmd, "/ST", st, "/SD", sd, "/F"],
        capture_output=True,
        text=True,
        shell=False,
    )
    out = (p.stdout or p.stderr or "").strip()
    if p.returncode == 0:
        return SchedResult(True, f"Scheduled {cmd} at {when}.")
    if "access is denied" in out.lower():
        return SchedResult(False, "Scheduling needs admin permission on this system.")
    return SchedResult(False, f"Schedule failed: {out[:200]}")


def cancel(task_name: str) -> SchedResult:
    tn = (task_name or "").strip()
    if not tn:
        return SchedResult(False, "Missing task name.")
    p = subprocess.run(["schtasks", "/Delete", "/TN", tn, "/F"], capture_output=True, text=True, shell=False)
    out = (p.stdout or p.stderr or "").strip()
    if p.returncode == 0:
        return SchedResult(True, f"Cancelled task {tn}.")
    return SchedResult(False, f"Cancel failed: {out[:200]}")