#!/bin/bash

# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2018-2020 Ian Leonard (antonlacon@gmail.com)
#
# Scan through the given directory looking for out of date source packages.
# If a source tarball is found that is different from what is currently in
# tree, then print out the discovered files.
#
# If -d is passed, also delete obsolete files.
# If -f is passed, fetch updated source tarballs.
# If -b is passed, build a new SOURCES, populated from the old SOURCES
#   Set NEW_SOURCES_DIR to customize the temp dir to use in building
# If -r is passed, replace the old SOURCES when finished building new SOURCES

set -e

. config/options ""

# default variables
DESTRUCTIVE_RUN="false"
FETCH_UPDATES="false"
PACKAGES_TO_UPDATE=()
BUILD_SOURCES="false"
REPLACE_OLD="false"
NEW_SOURCES="${NEW_SOURCES_DIR:-${SOURCES}.new}"


# helper functions
help(){
  echo "Usage: ${0} [-hdfbr]"
    echo "Set PROJECT, DEVICE and ARCH as required."
    echo "  -h this help"
    echo "  -d delete obsolete source packages (default no)"
    echo "  -f fetch updated source packages (default: no)"
    echo "  -b build new SOURCES content (default: no)"
    echo "  -r replace old SOURCES when rebuilding (default: no)"
}


# command line opts
while getopts hdfrb OPT; do
  case "${OPT}" in
    h)
      help
      exit 0
      ;;
    d)
      DESTRUCTIVE_RUN="true"
      ;;
    f)
      FETCH_UPDATES="true"
      ;;
    b)
      BUILD_SOURCES="true"
      ;;
    r)
      REPLACE_OLD="true"
      ;;
    \?)
      # error and output help on unknown
      help
      die
      ;;
  esac
done

shift $((${OPTIND}-1))


# sanity checking
if [ ! -d "${SOURCES}" ]; then
  die "error: ${SOURCES} is not a directory"
elif [ "${DESTRUCTIVE_RUN}" = "true" -a "${BUILD_SOURCES}" = "true" ]; then
  die "error: options '-d' and '-b' are mutually exclusive"
fi


# main
# process files in SOURCES
for SOURCE_PACKAGE in $(find "${SOURCES}/" -mindepth 1 -type d); do
  PACKAGE_NAME=$(basename "${SOURCE_PACKAGE}")

  # check if package is still in the tree to selectively prune, or delete the dir
  PACKAGE_DIR=$(get_pkg_directory "${PACKAGE_NAME}" || true)
  if [ -n "${PACKAGE_DIR}" ]; then
    PACKAGE_SOURCE_FILE=$(get_pkg_variable "${PACKAGE_NAME}" "PKG_SOURCE_NAME")
  fi
  # PACKAGE_DIR is null if not in tree, PACKAGE_SOURCE_FILE is null if PKG_ARCH mismatch
  if [ -n "${PACKAGE_DIR}" -a -n "${PACKAGE_SOURCE_FILE}" ]; then
    CUR_PACKAGE_FILE=$(basename "${PACKAGE_SOURCE_FILE}")

    for FILE in $(find "${SOURCE_PACKAGE}/" -type f); do
      # don't test auxilliary files
      if [[ "${FILE}" = *.url ]] || [[ "${FILE}" = *.sha256 ]]; then
        continue
      fi

      # obsolete file handling
      if [ "${FILE}" != "${SOURCES}/${PACKAGE_NAME}/${CUR_PACKAGE_FILE}" ]; then
        ls -1 "${FILE}"*
        PACKAGES_TO_UPDATE+="${PACKAGE_NAME}"

        if [ "${DESTRUCTIVE_RUN}" = "true" ]; then
          rm -f "${FILE}"*
        fi
      # current file handling
      elif [ "${BUILD_SOURCES}" = "true" ]; then
        echo "Relocating ${PACKAGE_NAME} files..."
        mkdir -p "${NEW_SOURCES}/${PACKAGE_NAME}"
        mv "${FILE}"* "${NEW_SOURCES}/${PACKAGE_NAME}/"
      fi
    done
  else
    echo "info: ${PACKAGE_NAME} no longer in tree"
    if [ "${DESTRUCTIVE_RUN}" = "true" ]; then
      rm -rf "${SOURCE_PACKAGE}"
    fi
  fi
done

if [ "${BUILD_SOURCES}" = "true" -a "${REPLACE_OLD}" = "true" ]; then
  rm -rf "${SOURCES}"
  mv "${NEW_SOURCES}" "${SOURCES}"
fi

if [ "${FETCH_UPDATES}" = "true" ]; then
  if "${BUILD_SOURCES}" = "true" -a "${REPLACE_OLD}" = "false" ]; then
    SOURCES="${NEW_SOURCES}"
  fi
  for PACKAGE in "${PACKAGES_TO_UPDATE[@]}"; do
    # scripts/get determines if tarball is present before downloading
    SOURCES_DIR="${SOURCES}" "${SCRIPTS}/get" "${PACKAGE}"
  done
fi

exit