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

regen_env_version() {
  echo "[fx-pipeline] regenerating .env.version defaults" >&2
  local git_rev branch app_v build_date build_user
  if [[ -n "${WOODPECKER_COMMIT:-}" ]]; then
    git_rev="$(printf '%s' "${WOODPECKER_COMMIT}" | cut -c1-7)"
  elif command -v git >/dev/null 2>&1; then
    git_rev="$(git rev-parse --short HEAD 2>/dev/null || echo dev)"
  else
    git_rev="dev"
  fi

  if [[ -n "${WOODPECKER_BRANCH:-}" ]]; then
    branch="${WOODPECKER_BRANCH}"
  elif command -v git >/dev/null 2>&1; then
    branch="$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo local)"
  else
    branch="local"
  fi

  if [[ -f version ]]; then
    app_v="$(cat version 2>/dev/null || echo dev)"
  else
    app_v="dev"
  fi

  build_date="$(date -u +%Y-%m-%dT%H:%M:%SZ 2>/dev/null || echo unknown)"
  build_user="${WOODPECKER_MACHINE:-woodpecker}"

  printf "GIT_REV=%s\nBUILD_BRANCH=%s\nAPP_V=%s\nBUILD_DATE=%s\nBUILD_USER=%s\n" \
    "$git_rev" "$branch" "$app_v" "$build_date" "$build_user" > .env.version
}

ensure_env_version() {
  if [[ ! -s ./.env.version ]]; then
    regen_env_version
    return
  fi

  local tmp
  tmp="$(mktemp)"
  if ! grep -E '^[[:space:]]*[A-Za-z_][A-Za-z0-9_]*=' ./.env.version >"$tmp"; then
    rm -f "$tmp"
    regen_env_version
    return
  fi

  if [[ ! -s "$tmp" ]]; then
    rm -f "$tmp"
    regen_env_version
    return
  fi

  mv "$tmp" ./.env.version
}

ensure_env_version