#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-3.0-or-later
"""Render the MQTT kiosk Home Assistant package from its parameterized template."""
import argparse
import json
import re
from pathlib import Path

parser = argparse.ArgumentParser()
parser.add_argument("--name", required=True)
parser.add_argument("--entity-prefix", required=True, help="HA device/entity slug, e.g. lounge_kiosk")
parser.add_argument("--command-root", required=True, help="MQTT command topic root, e.g. kiosk/commands/lounge")
parser.add_argument("--status-root", required=True, help="MQTT status topic root, e.g. kiosk/status/lounge")
parser.add_argument("--manufacturer", default="Generic")
parser.add_argument("--model", default="Linux Touchscreen Kiosk")
parser.add_argument("--area", default="")
parser.add_argument("--output", required=True, type=Path)
args = parser.parse_args()

if not re.fullmatch(r"[a-z][a-z0-9_]*", args.entity_prefix):
    parser.error("--entity-prefix must contain lowercase letters, digits, and underscores")
topic_pattern = r"[A-Za-z0-9_.-]+(?:/[A-Za-z0-9_.-]+)*"
if not re.fullmatch(topic_pattern, args.command_root):
    parser.error("--command-root must be a non-empty MQTT topic path without wildcards")
if not re.fullmatch(topic_pattern, args.status_root):
    parser.error("--status-root must be a non-empty MQTT topic path without wildcards")

text = Path(__file__).with_name("kiosk-package.yaml.in").read_text()
quoted_values = {
    "__KIOSK_NAME__": args.name,
    "__MANUFACTURER__": args.manufacturer,
    "__MODEL__": args.model,
    "__AREA__": args.area,
}
for marker, value in quoted_values.items():
    text = text.replace(f'"{marker}"', json.dumps(value, ensure_ascii=False))
    text = text.replace(marker, value)
for marker, value in {
    "__KIOSK_ENTITY_PREFIX__": args.entity_prefix,
    "__COMMAND_TOPIC_ROOT__": args.command_root,
    "__STATUS_TOPIC_ROOT__": args.status_root,
}.items():
    text = text.replace(marker, value)
if re.search(r"__[A-Z_]+__", text):
    raise SystemExit("Unresolved template marker remains")
if not args.area:
    text = text.replace('        suggested_area: ""\n', "")
args.output.parent.mkdir(parents=True, exist_ok=True)
args.output.write_text(text)