#!/bin/bash

readonly THISSCRIPT=$0
readonly BRANCH_NIGHTLY="unstable"
readonly DISTRIB="stretch"
readonly TIMETAG="$(date +%Y%m%d%H%M)"
readonly PACKAGES="moulinette SSOwat yunohost yunohost-admin"

source /home/vinaigrette/config/config


function main()
{
    if [[ "$(tty)" == "not a tty" ]]
    then
        echo "You aint in a tty (are you in a 'lxc exec' ?)"
        echo "The script can't run because pbuilder won't be happy :|"
        exit
    fi

    for PACKAGE in $PACKAGES;
    do

        echo "-------------------------------------"
        echo "Looking for update in ${PACKAGE} ... "

        build_if_needed $PACKAGE

    done
    echo "-------------------------------------"
}


function build_if_needed()
{
    local PACKAGE=$1

    cd $GIT_REPOS/$PACKAGE

    git fetch origin

    # Check if there's a branch named distrib-branch (e.g. stretch-unstable)
    # By default, keep just 'branch'
    BRANCH_NIGHTLY_GIT="$BRANCH_NIGHTLY"
    if git branch --list | awk '{print $1}' | grep -q "^$DISTRIB-$BRANCH_NIGHTLY$"
    then
	    BRANCH_NIGHTLY_GIT="$DISTRIB-$BRANCH_NIGHTLY"
    fi

    # If the branch name is an alias to another branch, "resolve" the alias
    if grep -q "ref: " .git/refs/heads/$BRANCH_NIGHTLY_GIT
    then
	    BRANCH_NIGHTLY_GIT=$(cat .git/refs/heads/$BRANCH_NIGHTLY_GIT | tr '/' ' ' | awk '{print $4}')
    fi

    git checkout $BRANCH_NIGHTLY_GIT >/dev/null 2>/dev/null
    if [ -z "$(git log ${BRANCH_NIGHTLY_GIT}..origin/${BRANCH_NIGHTLY_GIT})" ]; then
        echo "Sources up-to-date, nothing to build."
        #return
    fi
    git pull origin $BRANCH_NIGHTLY_GIT >/dev/null


    VERSION=$(dpkg-parsechangelog -S Version 2>/dev/null)
    VERSION_NIGHTLY="${VERSION}+${TIMETAG}"

    # Tweak the changelog temporarily
    echo "> Setting version in changelog to ${VERSION_NIGHTLY}"
    rm -f debian/changelog.dch
    cp debian/changelog debian/changelog.old
    dch --package "${PACKAGE}" \
        --force-bad-version \
	-v "${VERSION_NIGHTLY}" \
	-D "${BRANCH_NIGHTLY}" \
	--force-distribution \
	"Daily build." \
        > /dev/null 2>&1

    head -n 10 debian/changelog

    # Launch the build using build_deb script
    build

    # Restore changelog
    echo "> Restoring previous changelog"
    cd $GIT_REPOS/$PACKAGE
    cp debian/changelog.old debian/changelog
    rm debian/changelog.old

}

function build()
{
   # Create temporary folder
   TMP_FOLDER=$(mktemp -d)

   # Move files to a tmp folder
   echo "> Exporting in $TMP_FOLDER ...  "
   git ls-files | xargs tar -czf archive.tar.gz
   cat archive.tar.gz | tar -xz -C $TMP_FOLDER
   rm archive.tar.gz

   # Build Debian package
   echo "> Starting build ..."
   cd $TMP_FOLDER
   $BUILD_DEB $DISTRIB $BRANCH_NIGHTLY .
}

main