#!/bin/bash

# mp-migrate | MatterLinux package migration script 
# MatterLinux 2023-2024 (https://matterlinux.xyz)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

#############################
## import common functions ##
#############################
location="$(dirname "${0}")"
location="$(realpath "${location}")"
commonsh="$(echo "${location}" | sed 's/\/bin/\/lib/g')/mtsc-common.sh"

source "${commonsh}"

if [ "${?}" != "0" ]; then
  echo "Failed to import mtsc-common"
  exit 1
fi

#################
## main script ##
#################
if [ -z "$1" ]; then
  error "Please specify a package directory"
  exit 1
fi

if [ ! -d "$1" ]; then
  error "Failed to access to the specified directory"
  exit 1
fi

target="$(realpath "${1}")"
pkg_script="${target}/pkg.sh"
install_script="${target}/install.sh"

if [ ! -f "${pkg_script}" ]; then
  error "Specified directory does not contain a package script (pkg.sh)"
  exit 1
fi

info "Sourcing the package script"
source "${pkg_script}"

if [ -z "${VERSION}" ]; then
  error "Required package variable \"\$VERSION\" is not set"
  exit 1
fi

info "Auto generating the changes file"
cat > "${target}/changes.md" << EOF
# ${VERSION}
First version
EOF

info "Adding the gitignore file"
cat > "${target}/.gitignore" << EOF
.cache/
dist/
root/
EOF

sed -i 's/build() {/PACKAGE() {/' "${pkg_script}"
check_ret "Failed to update the build function"

if [ -f "${install_script}" ]; then
  info "Migrating the install script"
  echo >> "${pkg_script}"
  echo "INSTALL(){" >> "${pkg_script}"

  while read l; do
    echo "  ${l}" >> "${pkg_script}"
  done < "${install_script}"

  echo "}" >> "${pkg_script}"

  rm "${install_script}"
  check_ret "Failed to remove the install script"
fi

success "Migration is completed"