#!/usr/bin/env bash
set -euo pipefail

APP_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
CONFIG_PATH="${1:-${APP_DIR}/config.json}"
DOMAIN_FILE="${APP_DIR}/runtime/current_domain.txt"

before=""
if [[ -f "$DOMAIN_FILE" ]]; then
  before="$(tr -d '\r\n' < "$DOMAIN_FILE")"
fi

/usr/bin/python3 "${APP_DIR}/scripts/domain_updater.py" --config "$CONFIG_PATH"

after=""
if [[ -f "$DOMAIN_FILE" ]]; then
  after="$(tr -d '\r\n' < "$DOMAIN_FILE")"
fi

if [[ -z "$after" ]]; then
  echo "[vmess-domain-rotator] empty selected domain, skip git commit"
  exit 0
fi

if [[ "$before" == "$after" ]]; then
  echo "[vmess-domain-rotator] domain unchanged (${after}), skip git commit"
  exit 0
fi

if ! command -v git >/dev/null 2>&1; then
  echo "[vmess-domain-rotator] git not found, skip git commit"
  exit 0
fi

if ! git -C "$APP_DIR" rev-parse --is-inside-work-tree >/dev/null 2>&1; then
  echo "[vmess-domain-rotator] not a git repo, skip git commit"
  exit 0
fi

git -C "$APP_DIR" add runtime/current_domain.txt runtime/current_domain.json runtime/state.json runtime/substore_vars.json || true

if git -C "$APP_DIR" diff --cached --quiet; then
  echo "[vmess-domain-rotator] no staged changes, skip git commit"
  exit 0
fi

commit_name="${GIT_COMMIT_NAME:-vmess-domain-rotator}"
commit_email="${GIT_COMMIT_EMAIL:-vmess-domain-rotator@localhost}"
ts="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"

git -C "$APP_DIR" \
  -c user.name="$commit_name" \
  -c user.email="$commit_email" \
  commit -m "chore: rotate preferred domain to ${after} (${ts})"

echo "[vmess-domain-rotator] committed domain change: ${before} -> ${after}"