# Simply sets up a few useful variables.

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

function relative() {
  local full_path="${SCRIPT_DIR}/../${1}"

  if [ -d "${full_path}" ]; then
    # Try to use readlink as a fallback to readpath for cross-platform compat.
    if command -v realpath >/dev/null 2>&1; then
      realpath "${full_path}"
    elif ! (readlink -f 2>&1 | grep illegal > /dev/null); then
      readlink -f "${full_path}"
    else
      echo "Rocket's scripts require 'realpath' or 'readlink -f' support." >&2
      echo "Install realpath or GNU readlink via your package manager." >&2
      echo "Aborting." >&2
      exit 1
    fi
  else
    # when the directory doesn't exist, fallback to this.
    echo "${full_path}"
  fi
}

function future_date() {
  local days_in_future=`[[ -z "$1" ]] && echo "0" || echo "$1"`
  if date -v+1d +%Y-%m-%d > /dev/null 2>&1; then
    echo $(date -v+${days_in_future}d +%Y-%m-%d)
  elif date -d "+1 day" > /dev/null 2>&1; then
    echo $(date '+%Y-%m-%d' -d "+${days_in_future} days")
  else
    echo "Error: need a 'date' cmd that accepts -v (BSD) or -d (GNU)"
    exit 1
  fi
}

# Root of workspace-like directories.
PROJECT_ROOT=$(relative "") || exit $?
CONTRIB_ROOT=$(relative "contrib") || exit $?
BENCHMARKS_ROOT=$(relative "benchmarks") || exit $?
FUZZ_ROOT=$(relative "core/lib/fuzz") || exit $?

# Root of project-like directories.
CORE_LIB_ROOT=$(relative "core/lib") || exit $?
CORE_CODEGEN_ROOT=$(relative "core/codegen") || exit $?
CORE_HTTP_ROOT=$(relative "core/http") || exit $?

CORE_CRATE_ROOTS=(
    "${CORE_LIB_ROOT}"
    "${CORE_CODEGEN_ROOT}"
    "${CORE_HTTP_ROOT}"
)

CONTRIB_SYNC_DB_POOLS_CRATE_ROOTS=(
    "${CONTRIB_ROOT}/sync_db_pools/lib"
    "${CONTRIB_ROOT}/sync_db_pools/codegen"
)

CONTRIB_DB_POOLS_CRATE_ROOTS=(
    "${CONTRIB_ROOT}/db_pools/lib"
    "${CONTRIB_ROOT}/db_pools/codegen"
)

# Root of infrastructure directories.
EXAMPLES_DIR=$(relative "examples") || exit $?
DOC_DIR=$(relative "target/doc") || exit $?

# Versioning information.
VERSION=$(git grep -h "^version" "${CORE_LIB_ROOT}" | head -n 1 | cut -d '"' -f2)
GIT_BRANCH="$(git branch --show-current)"
GIT_BRANCH=${GIT_BRANCH:-$BRANCH}
IS_DEV_BRANCH=$( [[ $GIT_BRANCH == "v"* ]]; echo $? )

case $IS_DEV_BRANCH in
  1) DOC_VERSION="${GIT_BRANCH}-$(future_date)" ;;
  *) DOC_VERSION="${VERSION}" ;;
esac

function print_environment() {
  echo "  VERSION: ${VERSION}"
  echo "  GIT_BRANCH: ${GIT_BRANCH}"
  echo "  IS_DEV_BRANCH: ${IS_DEV_BRANCH}"
  echo "  DOC_VERSION: ${DOC_VERSION}"
  echo "  SCRIPT_DIR: ${SCRIPT_DIR}"
  echo "  PROJECT_ROOT: ${PROJECT_ROOT}"
  echo "  CONTRIB_ROOT: ${CONTRIB_ROOT}"
  echo "  FUZZ_ROOT: ${FUZZ_ROOT}"
  echo "  BENCHMARKS_ROOT: ${BENCHMARKS_ROOT}"
  echo "  CORE_LIB_ROOT: ${CORE_LIB_ROOT}"
  echo "  CORE_CODEGEN_ROOT: ${CORE_CODEGEN_ROOT}"
  echo "  CORE_HTTP_ROOT: ${CORE_HTTP_ROOT}"
  echo "  CONTRIB_SYNC_DB_POOLS_CRATE_ROOTS: ${CONTRIB_SYNC_DB_POOLS_CRATE_ROOTS[*]}"
  echo "  CONTRIB_DB_POOLS_CRATE_ROOTS: ${CONTRIB_DB_POOLS_CRATE_ROOTS[*]}"
  echo "  EXAMPLES_DIR: ${EXAMPLES_DIR}"
  echo "  DOC_DIR: ${DOC_DIR}"
  echo "  date(): $(future_date)"
}

if [ "${1}" = "-p" ]; then
  print_environment
fi