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

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck source=lib.sh
. "${SCRIPT_DIR}/lib.sh"

qipai_repo_status() {
  local repo_dir
  repo_dir="$(qipai_repo_dir)"

  if [ ! -d "${repo_dir}/.git" ]; then
    qipai_warn "repo not cloned: ${repo_dir}"
    qipai_info "expected repo: ${QIPAI_REPO_URL}"
    return 0
  fi

  git -C "$repo_dir" remote -v
  local branch status
  branch="$(git -C "$repo_dir" branch --show-current)"
  status="$(git -C "$repo_dir" status --short --branch --untracked-files=all)"
  qipai_info "branch: ${branch}"
  printf '%s\n' "$status"

  if [ "$branch" != "$QIPAI_BRANCH" ]; then
    qipai_fail "branch mismatch: expected ${QIPAI_BRANCH}, actual ${branch}"
    return 1
  fi

  if git -C "$repo_dir" diff --quiet && git -C "$repo_dir" diff --cached --quiet; then
    qipai_pass "repo is not dirty"
  else
    qipai_fail "repo is DIRTY; deployment must stop"
    return 1
  fi

  git -C "$repo_dir" fetch origin "$QIPAI_BRANCH"
  local counts
  counts="$(git -C "$repo_dir" rev-list --left-right --count "${QIPAI_BRANCH}...origin/${QIPAI_BRANCH}")"
  qipai_info "ahead/behind: ${counts}"
  case "$counts" in
    "0	0") qipai_pass "repo matches origin/${QIPAI_BRANCH}" ;;
    0$'\t'*) qipai_warn "repo is BEHIND origin/${QIPAI_BRANCH}" ;;
    *$'\t'0) qipai_fail "repo is AHEAD origin/${QIPAI_BRANCH}; deployment must stop"; return 1 ;;
    *) qipai_fail "repo is DIVERGED; deployment must stop"; return 1 ;;
  esac
}

if [ "${1:-}" = "--run" ]; then
  qipai_repo_status
fi