#!/bin/bash
#set -x
source /etc/libretools.conf
source $(dirname $0)/libremessages
source $XDG_CONFIG_HOME/libretools/libretools.conf >/dev/null 2>&1|| true

# End inmediately but print a useful message
trap_exit() {
  error "($(basename $0)) $@"
  exit 1
}

# Trap signals from makepkg
set -E
trap 'trap_exit "TERM signal caught. Exiting..."' TERM HUP QUIT
trap 'trap_exit "Aborted by user! Exiting..."' INT
trap 'trap_exit "An unknown error has occurred. Exiting..."' ERR

# return : full version spec, including epoch (if necessary), pkgver, pkgrel
#  usage : get_fullver( ${epoch:-0}, $pkgver, $pkgrel )
get_fullver() {
    if [ $1 -eq 0 ]; then
# zero epoch case, don't include it in version
        echo $2-$3
    else
        echo $1:$2-$3
    fi

}

# Add line to build order cache in CSV format
# $1 status
# $2 pkgname
add_order() {
  echo "${1};${DEPTH};${2:-${pkgbase}};${fullver};${PWD}" >> "${BUILDORDER}"
  ${VERBOSE} && msg2 "%${DEPTH}s${2:-${pkgbase}} [${1}]" || true
}

# Finds a PKGBUILD on toru's path cache
# Look in all caches but pick the first one
# TODO move to a toru flag (-p?)
where_is() {
  grep -m1 "^${1}:" "${TORUPATH}/paths" 2>/dev/null| \
    cut -d: -f2 2>/dev/null
}

if [ ! -f PKGBUILD ]; then
  error "Missing PKGBUILD"
  exit 1
fi

if ! source PKGBUILD ; then
  error "Can't source PKGBUILD"
  exit 1
fi

# Save resources
unset pkgdesc arch license groups backup install md5sums sha1sums \
      sha256sums source options >/dev/null 2>&1

unset build package >/dev/null 2>&1

for _pkg in ${pkgname[@]}; do
  unset package_${_pkg} >/dev/null 2>&1 || true
done
## 

# Get useful values
pkgbase="${pkgbase:-${pkgname[0]}}"
fullver=$(get_fullver ${epoch:-0} ${pkgver} ${pkgrel})

# Get or set the build order cache (canonical)
BUILDORDER="$(readlink -f "${1:-$(mktemp /tmp/${pkgbase}.buildorder.XXXX)}")"
DEPTH=${2:-0}
NEXTDEPTH=$((${DEPTH} + 1))
VERBOSE=true

# ensure it exists
touch "${BUILDORDER}"

# If this package is already built quit silently
if is_built "${pkgbase}>=${fullver}"; then
  add_order "ignore"
  exit 0
fi

# Ignore if already in build order
egrep -q ";${pkgbase};" "${BUILDORDER}" && exit 0

# Add pkgbase to build order
add_order "build"

# Cleanup dep versioning
deps=($(echo "${depends[@]} ${makedepends[@]}" | \
       sed "s/[=<>]\+[^ ]\+//g" | \
       tr ' ' "\n" | \
       sort -u))

# NOTE: getting depends from package() is a PITA
for _dep in ${deps[@]}; do
# Ignore if already in build order
  egrep -q ";${_dep};" "${BUILDORDER}" && continue

  depdir="$(where_is ${_dep})"

  if [ -z "${depdir}" -o ! -d "${depdir}" ]; then
# We specify the pkgname because we can't source the dep PKGBUILD
    add_order "missing" "${_dep}"
    continue
  fi

  pushd "${depdir}" >/dev/null

# Run itself over dependencies
  $0 "${BUILDORDER}" ${NEXTDEPTH}

done

# Only print build order at the end
if [ ${DEPTH} -eq 0 ]; then
  ${VERBOSE} && msg "Build tree stored in ${BUILDORDER}" || true
  ${VERBOSE} || echo "${BUILDORDER}" || true
fi

exit $?