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

SCRIPT_DIR="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"
ROOT_DIR="$(CDPATH= cd -- "$SCRIPT_DIR/.." && pwd)"

if [ -x "$ROOT_DIR/.venv/bin/python" ]; then
  PYTHON_BIN="$ROOT_DIR/.venv/bin/python"
else
  PYTHON_BIN="python3"
fi

fail() {
  echo "$*" >&2
  exit 1
}

require_command() {
  if ! command -v "$1" >/dev/null 2>&1; then
    fail "missing command: $1"
  fi
}

current_branch() {
  local branch
  branch="$(git -C "$ROOT_DIR" rev-parse --abbrev-ref HEAD)"
  if [ "$branch" = "HEAD" ]; then
    fail "current git HEAD is detached; switch to a branch first"
  fi
  echo "$branch"
}

has_upstream() {
  git -C "$ROOT_DIR" rev-parse --abbrev-ref --symbolic-full-name '@{upstream}' >/dev/null 2>&1
}

commit_message() {
  if [ "$#" -gt 0 ]; then
    printf '%s\n' "$1"
    return 0
  fi
  date '+deploy %Y-%m-%d %H:%M:%S'
}

main() {
  require_command git
  require_command "$PYTHON_BIN"

  local branch
  local message
  branch="$(current_branch)"
  message="$(commit_message "$@")"

  cd "$ROOT_DIR"

  # 统一先把当前工作区改动全部纳入本次发布。
  git add -A

  # 没有新增改动时跳过提交，仍然允许继续推送和部署。
  if ! git diff --cached --quiet; then
    git commit -m "$message"
  else
    echo "no local changes to commit"
  fi

  if has_upstream; then
    git push
  else
    git push -u origin "$branch"
  fi

  # 强制让远端按当前分支拉取，避免部署脚本和本地分支漂移。
  MONITOR_REPO_REF="$branch" \
  MONITOR_REPO_URL="$(git -C "$ROOT_DIR" remote get-url origin)" \
  "$PYTHON_BIN" "$ROOT_DIR/ops/deploy_via_tat.py"
}

main "$@"