#!/usr/bin/env python3
"""Open the approved OpenBao login in a new empty Playwright Chromium profile.

The Windows default browser is not used. A previous login opened Firefox,
which was already signed in as another account. This launcher uses the
headed Chromium binary pinned by coulomb-social's Playwright install.
"""
import json
import os
import pwd
import subprocess
import sys
import tempfile
from pathlib import Path
from urllib.parse import parse_qs, urlsplit


BROWSERS_JSON = Path(
    "/home/worsch/coulomb-social/scripts/node_modules/playwright-core/browsers.json"
)


def allowed(url):
    try:
        parsed = urlsplit(url)
        query = parse_qs(parsed.query)
        return (
            parsed.scheme == "https"
            and parsed.hostname == "kc.coulomb.social"
            and parsed.port in (None, 443)
            and parsed.username is None
            and parsed.password is None
            and not parsed.fragment
            and not any(char in url for char in "\r\n\x00")
            and query.get("redirect_uri")
            in (
                ["http://localhost:8250/oidc/callback"],
                ["http://127.0.0.1:8250/oidc/callback"],
            )
        )
    except ValueError:
        return False


def chromium_executable(browsers_json, cache_root):
    try:
        spec = json.loads(Path(browsers_json).read_text(encoding="utf-8"))
    except (OSError, UnicodeError, json.JSONDecodeError):
        return ""
    browsers = spec.get("browsers") if isinstance(spec, dict) else None
    if not isinstance(browsers, list):
        return ""
    revision = ""
    for item in browsers:
        if isinstance(item, dict) and item.get("name") == "chromium":
            revision = str(item.get("revision") or "")
            break
    if not revision.isdecimal():
        return ""
    candidate = Path(cache_root) / f"chromium-{revision}" / "chrome-linux64" / "chrome"
    if candidate.is_file() and os.access(candidate, os.X_OK):
        return str(candidate)
    return ""


def playwright_cache(process_home, account_home):
    """The Chromium pin lives in the account cache.

    Attended platform-admin login replaces the process home with an empty
    session before OpenBao starts. Looking under that session misses the
    binary, the window never opens, and the OIDC callback times out.
    """
    del process_home
    return Path(account_home) / ".cache" / "ms-playwright"


def browser_path():
    account_home = pwd.getpwuid(os.getuid()).pw_dir
    return chromium_executable(
        BROWSERS_JSON, playwright_cache(Path.home(), account_home)
    )


def launch_argv(browser, profile_dir, url):
    return [
        browser,
        f"--user-data-dir={profile_dir}",
        "--no-first-run",
        "--no-default-browser-check",
        "--disable-sync",
        "--new-window",
        url,
    ]


def classify_cmd(argv):
    """Classify OpenBao's WSL launch, `cmd.exe /c start <url>`.

    hashicorp/cap replaces each & with ^& before calling the Windows
    default browser. Other cmd.exe uses are left for the real binary.
    """
    if list(argv[:2]) != ["/c", "start"] or len(argv) != 3:
        return "delegate", ""
    url = str(argv[2]).replace("^&", "&")
    if allowed(url):
        return "open", url
    return "reject", ""


def stamp(result):
    path = Path("/home/worsch/.local/state/railiance/receipts/operator-browser-last.txt")
    try:
        path.parent.mkdir(mode=0o700, parents=True, exist_ok=True)
        path.write_text(result + "\n", encoding="utf-8")
        os.chmod(path, 0o600)
    except OSError:
        return


def open_url(url):
    if not os.environ.get("DISPLAY") and not os.environ.get("WAYLAND_DISPLAY"):
        stamp("no-display")
        return 1
    browser = browser_path()
    if not browser:
        stamp("no-browser")
        return 1
    profile = Path(tempfile.mkdtemp(prefix="operator-browser-"))
    os.chmod(profile, 0o700)
    command = launch_argv(browser, str(profile), url)
    try:
        subprocess.Popen(
            command,
            stdin=subprocess.DEVNULL,
            stdout=subprocess.DEVNULL,
            stderr=subprocess.DEVNULL,
            start_new_session=True,
        )
    except OSError:
        stamp("open-failed")
        return 1
    stamp("opened")
    return 0


def main():
    stamp("called")
    if len(sys.argv) != 2 or not allowed(sys.argv[1]):
        stamp("rejected")
        return 1
    return open_url(sys.argv[1])


if __name__ == "__main__":
    raise SystemExit(main())