# ─────────────────────────────────────────────────────────────────
# otp_fill.py — fill an SMS OTP into a running SARS login Chromium
# session via Chrome DevTools Protocol.
#
# Used by the parent agent when `SARS login Company spesific.py`
# detects a SARS OTP prompt and pauses. The login script writes its
# CDP port + PID to `scripts/.sars_cdp.json`; we read it from there
# (or accept the port as an argument) and connect.
#
# Usage:
#   .venv\Scripts\python otp_fill.py <cdp_port> <otp>
#   .venv\Scripts\python otp_fill.py --from-marker <otp>
#
# Returns exit code 0 on success, non-zero on failure (with a clear
# stderr message so the agent can debug).
# ─────────────────────────────────────────────────────────────────

import argparse
import json
import sys
import time
from pathlib import Path

from playwright.sync_api import sync_playwright

SCRIPTS_DIR = Path(__file__).resolve().parent
CDP_INFO_PATH = SCRIPTS_DIR / ".sars_cdp.json"

# Selectors that match SARS's OTP input. Kept in sync with
# SARS login Company spesific.py::OTP_SELECTORS.
OTP_SELECTORS = [
    "input[aria-label*='OTP' i]",
    "input[aria-label*='One' i]",  # "One Time Pin"
    "input[aria-label*='verification' i]",
    "input[placeholder*='OTP' i]",
    "input[placeholder*='PIN' i]",
    "input[name*='otp' i]",
    "input[id*='otp' i]",
    "input[type='tel']",
]

# Button names SARS uses to submit the OTP. First match wins.
SUBMIT_BUTTON_NAMES = ["Submit", "Verify", "Continue", "Login", "Confirm", "Next"]


def _fill_otp(page, otp: str) -> str:
    """Find the OTP input and fill it. Returns the selector that matched."""
    for sel in OTP_SELECTORS:
        try:
            loc = page.locator(sel).first
            if loc.count() > 0:
                loc.fill(otp)
                return sel
        except Exception:
            continue
    raise RuntimeError(
        f"No OTP field found matching any of {OTP_SELECTORS} "
        f"(current URL: {page.url})"
    )


def _click_submit(page) -> str:
    """Click the submit button. Returns the button name that matched."""
    for name in SUBMIT_BUTTON_NAMES:
        try:
            btn = page.get_by_role("button", name=name).first
            if btn.count() > 0:
                btn.click(timeout=3_000)
                return name
        except Exception:
            continue
    raise RuntimeError(
        f"No submit button found matching any of {SUBMIT_BUTTON_NAMES}"
    )


def main() -> int:
    ap = argparse.ArgumentParser(
        description=(
            "Inject an SMS OTP into a running SARS login Chromium session "
            "via Chrome DevTools Protocol."
        )
    )
    ap.add_argument("port_or_marker", help="CDP port number, or --from-marker flag value")
    ap.add_argument("otp", help="OTP/PIN value to type into the browser")
    ap.add_argument(
        "--from-marker",
        action="store_true",
        help=(
            "Read CDP port + PID from scripts/.sars_cdp.json "
            "(written by the SARS login script)."
        ),
    )
    args = ap.parse_args()

    if args.from_marker:
        try:
            with open(CDP_INFO_PATH) as f:
                port = json.load(f)["cdp_port"]
        except Exception as e:
            print(
                f"ERROR: Could not read {CDP_INFO_PATH}: {e}",
                file=sys.stderr,
            )
            return 2
        print(f"Read CDP port {port} from {CDP_INFO_PATH}")
    else:
        port = int(args.port_or_marker)

    otp = args.otp

    try:
        with sync_playwright() as p:
            browser = p.chromium.connect_over_cdp(f"http://127.0.0.1:{port}")
            if not browser.contexts:
                print("ERROR: Browser has no contexts", file=sys.stderr)
                return 3
            ctx = browser.contexts[0]
            if not ctx.pages:
                print("ERROR: Context has no pages", file=sys.stderr)
                return 4
            page = ctx.pages[0]
            print(f"Connected to port {port}. URL: {page.url}")

            matched_sel = _fill_otp(page, otp)
            print(f"Filled OTP into field matched by: {matched_sel}")

            try:
                btn_name = _click_submit(page)
                print(f"Clicked button: {btn_name}")
            except RuntimeError as e:
                print(f"WARNING: {e}", file=sys.stderr)
                print("OTP filled but not submitted. Typing Enter as fallback.")
                try:
                    page.keyboard.press("Enter")
                except Exception:
                    pass

            time.sleep(2)
            print(f"After submit, URL: {page.url}")
    except Exception as e:
        print(f"ERROR: {type(e).__name__}: {e}", file=sys.stderr)
        return 5

    print("OK")
    return 0


if __name__ == "__main__":
    sys.exit(main())