#!/usr/bin/env bash

build::addLicense() {
  local target="${1:?}"
  local licenseText="#
# 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
# 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 <http://www.gnu.org/licenses/>.

"
  printf '%s' "${licenseText}" >> "${target}"
}

build::headerRdlink() {
  local target="${1:?}"
  local fileHeader="#!/usr/bin/env bash

# rdlink.sh [OPTIONS] <PATH>
#  [OPTION]
#     --  :  End of options marker
#     -*  :  Other options are ignored
#
# Version: $(git describe --long --tags --always --dirty)
#  Author: Martin Winkler
#  Origin: https://winklerfamilie.eu/git/efelon/rdlink.git
"
  printf '%s' "${fileHeader}" > "${target}"
  build::addLicense "${target}"
}

build::headerStarter() {
  local target="${1:?}"
  local fileHeader="#!/usr/bin/env bash

# starter.sh
#
# Start or source your application at the end to have the 
# environment variable \$_origin available.
#
# Version: $(git describe --long --tags --always --dirty)
#  Author: Martin Winkler
#  Origin: https://winklerfamilie.eu/git/efelon/rdlink.git
"
  printf '%s' "${fileHeader}" > "${target}"
  build::addLicense "${target}"
}

build::rdlink() {
  readonly build_dir="$(cd "$(dirname -- "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
  readonly rdlinkRelease="${build_dir}/release/rdlink.sh"
  readonly starterRelease="${build_dir}/release/starter.sh"
  readonly color_green='\033[1;32m'
  readonly color_red='\033[1;31m'
  readonly color_less='\033[0m'
  readonly shellcheck_cmd="$(command -v shellcheck)"
  local testresult_graphic=
  testresult_graphic="${color_green}✔${color_less}" # alt. symbol ✓
  testresult_graphic_fail="${color_red}✗${color_less}" # alt. symbol ≠

  if ! mkdir -p "$(dirname -- "${rdlinkRelease}")" ; then
    printf ' [ERROR] Cannot create release directory\n'
    return 1
  fi

  printf '# Building releases based on rdlink.sh\n'

  build::headerRdlink "${rdlinkRelease}"
  printf '  (Extracting script part and removing debug information)\n'
  printf '  Building release/rdlink.sh...'
  # Get essential script content
  # * extract script part
  # * remove script marker
  #   * remove debug function calls
  #   * remove debug options from rdlink
  # * replace multiple empty lines with one
  if sed -n '/### Script.*/,/### Script EOF/ p' < "${build_dir}/rdlink.sh" \
      | sed '/### Script.*/d; /^[[:blank:]]*info/d; /-d\{1,2\}/,/;;/d' \
      | sed '/^$/N; /^\n$/D' \
        >> "${rdlinkRelease}" 2>/dev/null ; then
    printf '%b' "${testresult_graphic}\n"
  else
    printf '%b' "${testresult_graphic_fail}\n"
    return 1
  fi

  { 
    build::headerStarter "${starterRelease}"
    printf '  Building release/starter.sh...'
    if sed -n '/### Script.*/,/### Script Starter EOF/ p' < "${build_dir}/rdlink.sh" \
        | sed '/### Script.*/d; /^[[:blank:]]*info/d; /-d\{1,2\}/,/;;/d' \
        | sed '/^$/N; /^\n$/D' \
          >> "${starterRelease}" 2>/dev/null ; then
      printf '%b' "${testresult_graphic}\n"
    else
      printf '%b' "${testresult_graphic_fail}\n"
      return 1
    fi

    printf '_origin="$(cd "$(dirname -- "$(rl::rdlink "${BASH_SOURCE[0]}")")" >/dev/null 2>&1 && pwd)"\n' >> "${starterRelease}"
    printf 'export _origin\n\n' >> "${starterRelease}"

    printf '# Uncomment one of the next lines and replace "tostart.sh" with your script\n' >> "${starterRelease}"
    printf '# to have _origin available even on platforms not supporting readlink -f.\n\n' >> "${starterRelease}"
    printf '#bash "${_origin}/tostart.sh"\n' >> "${starterRelease}"
    printf '#. "${_origin}/tostart.sh"\n' >> "${starterRelease}"
    printf '#"${_origin}/tostart.sh"\n' >> "${starterRelease}"
  }

  if [[ "${shellcheck_cmd}" ]] ; then
    printf '%b\n' "  Running shellcheck for rdlink...\033[1A\033[s\n"
    if "${shellcheck_cmd}" "${rdlinkRelease}" ; then
      printf '%b' "\033[u${testresult_graphic}\n"
    else
      return 1
    fi
    printf '%b\n' "  Running shellcheck for starter...\033[1A\033[s\n"
    if "${shellcheck_cmd}" "${starterRelease}" ; then
      printf '%b' "\033[u${testresult_graphic}\n"
    else
      return 1
    fi
  fi
  chmod +x "${rdlinkRelease}"
  return 0
}

build::rdlink