#!/usr/bin/env sh
#
# stowpkg package manager
#
# Copyright (C) 2017 Silvio Rhatto - rhatto at riseup.net
#
# 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/>.

# Parameters
VERSION="0.0.1"
DIRNAME="$(cd `dirname $0` && pwd)"
BASENAME="`basename $0`"
ACTION="$1"

__stowpkg_initialize () {
  # Check for stow
  if ! which stow > /dev/null 2>&1; then
    echo "$BASENAME: please install stow first"
    exit 1
  fi

  # Sudo config
  if [ "`whoami`" != 'root' ]; then
    SUDO="sudo"
  fi

  # Source config file
  if [ -e "$HOME/.config/stowpkg" ]; then
    . "$HOME/.config/stowpkg"
  fi

  # Ports
  if [ -z "$PORTS" ]; then
    PORTS="$DIRNAME/ports"
  fi

  # Set base
  if [ -z "$BASE" ]; then
    BASE="$DIRNAME/tree/`uname -m`"
  fi

  # Sources
  if [ -z "$SOURCES" ]; then
    SOURCES="$BASE/src"
  fi

  # Binaries
  if [ -z "$BINARIES" ]; then
    BINARIES="$BASE/stow"
  fi

  # Ensure folders exists
  mkdir -p $BASE $PORTS $SOURCES $BINARIES

  # Export
  export BASE="$BASE"
  export PORTS="$PORTS"
  export SOURCES="$SOURCES"
  export BASE="$BINARIES"
}

stowpkg_usage () {
  echo "$BASENAME $VERSION - a package manager"
  echo ""
  echo "usage: $BASENAME <action> [options]"
  echo ""
  echo "available actions:"
  echo ""
  grep "^stowpkg_" $0 | cut -d ' ' -f 1 | sed -e 's/stowpkg_//' | sort | xargs -L 6 | column -t -c 6 | sed -e 's/^/\t/'
  echo ""

  exit 1
}

stowpkg_search () {
  local package="$2"

  if [ ! -z "$package" ]; then
    stowpkg_search | grep "$package$"
  else
    ( cd $PORTS && find -name 'desc' | sed -e 's|^\./||' -e 's|/desc||' )
  fi
}

stowpkg_install () {
  local package="$2"

  if [ -z "$package" ]; then
    stowpkg_usage
  fi

  # Find package on ports
  local location="$PORTS/`$0 search $package`"

  if [ "$location" = "${PORTS}/" ]; then
    echo "$BASENAME: package not found: $package"
    exit 1
  fi
  
  if [ "`basename $location`" != "$package" ]; then
    echo "$BASENAME: package not found: $package"
    exit 1
  fi

  # Source environment
  if [ -e "$location/env" ]; then
    . $location/env
  fi

  # Set default version
  if [ -z "$version" ]; then
    version="latest"
  fi

  # Set PREFIX
  if [ -z "$PREFIX" ]; then
    PREFIX="$BINARIES/${package}-${version}"
  fi

  # Resolve default dependencies
  if [ ! -z "$dependencies_stowpkg" ]; then
    for dependency in $dependencies_stowpkg; do
      $0 install $dependency
    done
  fi

  # Resolve debian dependencies
  if [ -e "/etc/debian_version" ]; then
    if [ ! -z "$dependencies_debian" ]; then
      $SUDO apt install $dependencies_debian
    fi
  fi

  # Go to sources folder
  cd $SOURCES

  # Download sources if needed
  if [ ! -d "${package}-${version}" ]; then
    if [ "$source_format" = "git" ]; then
      git clone $url ${package}-${version}
    fi
  fi

  # Go to source folder
  if [ ! -d "${package}-${version}" ]; then
    echo "$BASENAME: source not found for package $package"
    exit 1
  fi

  cd ${package}-${version}

  # Build
  if [ -e "$location/rules" ]; then
    . $location/rules
  else
    # Run default rules
    if [ -e "Makefile" ]; then
      make clean
    fi

    if [ -e "configure" ]; then
      ./configure --prefix=$PREFIX
    fi

    if [ -e "Makefile" ]; then
      make PREFIX=$PREFIX
      make PREFIX=$PREFIX install
    fi
  fi

  cd $BINARIES

  if [ -d "${package}-${version}" ]; then
    stow ${package}-${version} || exit 1
  else
    echo "$BASENAME: error building $package"
    exit 1
  fi
}

# Dispatch
if grep -q "^stowpkg_$ACTION () {$" $0; then
  __stowpkg_initialize
  stowpkg_$ACTION $*
else
  stowpkg_usage
fi