#!/usr/bin/env python3
"""Self-installing / self-updating entry point — `python update.py`.

Run it once (the install one-liner does this for you). From then on a Windows
Scheduled Task runs it automatically **at logon and once a day**, so the watchers
stay up to date and running with zero further thought. Each run it:

  1. makes config.ini on first run (webhook prefilled; gitignored so your edits
     and OCR snip survive every update),
  2. `git pull`s the latest watcher code,
  3. installs/upgrades deps only when something changed,
  4. (re)starts the watchers ONLY if the code changed or they aren't running —
     so the daily run never interrupts an active session for nothing,
  5. ensures the daily+logon Scheduled Task exists (idempotent).

First time on a new PC (or just paste the install one-liner):
    git clone https://git.armoredarmadillo.com/brockdarnold/eve-watcher.git
    cd eve-watcher
    python update.py
    python eve_orehold_watcher.py --snip     # one-time GUI step for OCR hold alerts
"""
import configparser
import os
import shutil
import subprocess
import sys

HERE = os.path.dirname(os.path.abspath(__file__))
WIN = os.name == "nt"
TASK = "EveWatcher"
WATCHER_SCRIPTS = ("eve_combat_watcher.py", "eve_chat_watcher.py", "eve_orehold_watcher.py")


def run(cmd, **kw):
    print(f"  $ {' '.join(cmd)}")
    return subprocess.run(cmd, cwd=HERE, **kw)


def ps(script):
    """Run a PowerShell snippet, return (rc, stdout)."""
    r = subprocess.run(["powershell", "-NoProfile", "-ExecutionPolicy", "Bypass",
                        "-Command", script], cwd=HERE, capture_output=True, text=True)
    return r.returncode, (r.stdout or "").strip()


def ensure_config():
    cfg = os.path.join(HERE, "config.ini")
    first = not os.path.exists(cfg)
    if first:
        shutil.copyfile(os.path.join(HERE, "config.ini.example"), cfg)
        print("• created config.ini from example (webhook prefilled).")
    else:
        print("• config.ini exists — your settings + OCR snip left untouched.")
    # heal a UTF-8 BOM left by the old PowerShell installer (breaks configparser)
    with open(cfg, "rb") as fh:
        raw = fh.read()
    if raw.startswith(b"\xef\xbb\xbf"):
        with open(cfg, "wb") as fh:
            fh.write(raw[3:])
        print("• stripped a UTF-8 BOM from config.ini (old-installer leftover).")
    return cfg, first


def git_pull():
    """Return True if new commits were pulled."""
    if not os.path.isdir(os.path.join(HERE, ".git")):
        print("• not a git clone — can't auto-update. Reinstall via:\n"
              "    git clone https://git.armoredarmadillo.com/brockdarnold/eve-watcher.git")
        return False
    r = subprocess.run(["git", "pull", "--ff-only"], cwd=HERE,
                       capture_output=True, text=True)
    out = (r.stdout + r.stderr).strip()
    print(f"  git: {out.splitlines()[-1] if out else '(no output)'}")
    if r.returncode != 0:
        print("! git pull failed (local edits to tracked files?). config.ini is safe.")
        return False
    return "Already up to date" not in out and "Already up-to-date" not in out


def deps():
    req = os.path.join(HERE, "requirements.txt")
    if os.path.exists(req):
        run([sys.executable, "-m", "pip", "install", "--quiet", "-r", req])


def watchers_running():
    if not WIN:
        return 0
    _, out = ps("(Get-CimInstance Win32_Process -Filter \"Name='pythonw.exe'\" "
                "| Where-Object { $_.CommandLine -like '*watcher*' }).Count")
    try:
        return int(out or "0")
    except ValueError:
        return 0


def stop_watchers():
    ps("Get-CimInstance Win32_Process -Filter \"Name='pythonw.exe'\" | "
       "Where-Object { $_.CommandLine -like '*watcher*' } | "
       "ForEach-Object { Stop-Process -Id $_.ProcessId -Force }")


def start_watchers(cfg_path):
    if not WIN:
        print("• non-Windows — start watchers manually (this is a Windows tool).")
        return
    stop_watchers()
    run(["powershell", "-ExecutionPolicy", "Bypass", "-File",
         os.path.join(HERE, "start-all.ps1")])
    cp = configparser.ConfigParser()
    cp.read(cfg_path, encoding="utf-8-sig")
    if cp.get("watcher", "mode", fallback="ocr") == "ocr" and \
       not cp.get("ocr", "region", fallback="").strip():
        print("\n  >> ONE-TIME (per PC) for hold/compress/stall alerts, run once:\n"
              "     python eve_orehold_watcher.py --snip\n"
              "     (drag a box around the Ore Hold fill bar; saved forever after.)")


def ensure_task():
    """Register a daily + at-logon Scheduled Task so this runs itself forever.
    Idempotent: only creates it if missing."""
    if not WIN:
        return
    rc, _ = ps(f"Get-ScheduledTask -TaskName '{TASK}' -ErrorAction SilentlyContinue")
    if rc == 0:
        print(f"• Scheduled Task '{TASK}' already set (auto-update at logon + daily).")
        return
    pyw = os.path.join(os.path.dirname(sys.executable), "pythonw.exe")
    if not os.path.exists(pyw):
        pyw = "pythonw.exe"
    here = HERE.replace("'", "''")
    pyw_e = pyw.replace("'", "''")
    snippet = (
        f"$a = New-ScheduledTaskAction -Execute '{pyw_e}' "
        f"-Argument '\"{here}\\update.py\"' -WorkingDirectory '{here}';"
        "$t1 = New-ScheduledTaskTrigger -AtLogOn;"
        "$t2 = New-ScheduledTaskTrigger -Daily -At 5am;"
        "$s = New-ScheduledTaskSettingsSet -StartWhenAvailable "
        "-AllowStartIfOnBatteries -DontStopIfGoingOnBatteries "
        "-ExecutionTimeLimit (New-TimeSpan -Hours 1);"
        "$p = New-ScheduledTaskPrincipal -UserId $env:USERNAME "
        "-LogonType Interactive -RunLevel Limited;"
        f"Register-ScheduledTask -TaskName '{TASK}' -Action $a -Trigger $t1,$t2 "
        "-Settings $s -Principal $p -Force | Out-Null")
    rc, out = ps(snippet)
    if rc == 0:
        print(f"• Scheduled Task '{TASK}' created — auto-updates at logon + daily 5am. "
              "You never have to run this again.")
    else:
        print(f"! couldn't register Scheduled Task: {out}")


def main():
    print("=== Eve watcher setup / auto-update ===")
    cfg, first = ensure_config()
    changed = git_pull()
    if changed or first:
        deps()
    if changed or first or watchers_running() == 0:
        start_watchers(cfg)
    else:
        print("• up to date and watchers already running — nothing to restart.")
    ensure_task()
    print("\nDone. Hands-off from here: it updates + keeps itself running automatically.")


if __name__ == "__main__":
    main()