#!/bin/bash

readonly THISSCRIPT=$0
readonly PROJECT=$1
readonly BRANCH=$2
readonly DISTRIB=$3
readonly VERSION=$4
readonly TAG="debian/$VERSION"

source /home/vinaigrette/config/config

# ##### #
# Usage #
# ##### #

function usage()
{
    cat << EOF

Usage:
  $THISSCRIPT <project> <branch> <version>

Arguments:
  <project>     moulinette, yunohost, yunohost-admin or SSOwat
  <branch>      testing or stable
  <distrib>     stretch (can only build for stretch, no jessie)
  <version>     x.y.z (ex: 2.6.1)

EOF
}

# ################# #
# Check user inputs #
# ################# #

function validate_arguments()
{

    ## Project
    if [[ ! $PROJECT =~ ^yunohost|yunohost-admin|moulinette|SSOwat$ ]]; then
        echo "Invalid project $PROJECT"
        usage
        exit 1
    fi

    ## Branch
    if [[ ! $BRANCH =~ ^testing|stable|unstable$ ]]; then
        echo "Invalid branch $BRANCH"
        usage
        exit 2
    fi

    # Distribution
    if [[ ! $DISTRIB =~ ^stretch$ ]]; then
        echo "Invalid distribution $DISTRIB"
        usage
        exit 3
    fi

    # Version
    if [ -z "$VERSION" ]; then
        echo "Invalid version $VERSION"
        usage
        exit 4
    fi
}

function checkout_tag()
{
    # Update project's repository
    echo ""
    echo "> Updating $GIT_REPOS/$PROJECT repository ... "
    echo ""

    cd $GIT_REPOS/$PROJECT
    git fetch --quiet
    git fetch --tags --quiet
    git checkout $DISTRIB-$BRANCH --quiet
    #git checkout $BRANCH --quiet
    #git pull origin $BRANCH --quiet

    LASTVERSIONCHANGELOG=$(dpkg-parsechangelog -S Version 2>/dev/null)

    if [[ "$VERSION" != "$LASTVERSIONCHANGELOG" ]]
    then
	echo "Version $VERSION is not the last version in changelog"
	exit
    fi

    # Check if tag really exists
    if ! git rev-parse "$TAG" >/dev/null 2>&1;
    then
        echo "Invalid version $VERSION (there's no tag $TAG in the git repo !)"
        exit
    fi
    # Get commit for the tag and for HEAD
    TAGCOMMIT=$(git rev-parse "$TAG")
    HEADCOMMIT=$(git rev-parse "HEAD")

    if [[ "$TAGCOMMIT" != "$HEADCOMMIT" ]]
    then
        echo "Tag $TAG is not the HEAD of the branch :/"
        exit
    fi


}

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

   # Extract git archive a desired tag
   echo ""
   echo "> Exporting in $TMP_FOLDER ...  "
   echo ""
   git archive $TAG --format=tar | tar -x -C $TMP_FOLDER

   # Build Debian package
   echo "###############################"
   echo "# Building Debian package ... #"
   echo "###############################"
   cd $TMP_FOLDER
   $BUILD_DEB -d $BRANCH -c $DISTRIB .
}


function main()
{

    # If used asked for help, show usage
    if [[ $1 == "-h" ]] || [[ $1 == "--help" ]]; then
        usage
        exit 0
    fi

    validate_arguments

    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

    # Sum up configuration
    echo "########################################################"
    echo "# Building $PROJECT $BRANCH release - $VERSION version  "
    echo "########################################################"

    checkout_tag
    build

}


main