#!/bin/bash

readonly THISSCRIPT=$0
readonly PROJECT=$1
readonly BRANCH=$2
readonly DISTRIB="stretch"
readonly VERSION=$3
readonly TAG=$(echo "debian/$VERSION" | tr '~' '-')

source /home/vinaigrette/config/config
source /home/vinaigrette/scripts/common.sh

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

function usage()
{
    cat << EOF

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

Arguments:
  <project>     moulinette, yunohost, yunohost-admin or SSOwat
  <branch>      testing or stable
  <version>     x.y.z (ex: 2.6.1)

EOF
}

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

function validate_arguments()
{
    [[ $PROJECT =~ ^yunohost|yunohost-admin|moulinette|SSOwat$ ]] || critical "Invalid project $PROJECT"
    [[ $BRANCH =~ ^testing|stable|unstable$ ]] || critical "Invalid branch $BRANCH"
    [[ $DISTRIB =~ ^stretch$ ]] || critical "Invalid distribution $DISTRIB"
    [[ ! -z "$VERSION" ]] || critical "Invalid version $VERSION"
    [[ "$(tty)" != "not a tty" ]] || critical "You aint in a tty (are you in a 'lxc exec' ?) The script can't run because pbuilder won't be happy :|"
}

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

    cd $GIT_REPOS/$PROJECT
    git fetch --quiet
    git fetch --tags --quiet
    git checkout $DISTRIB-$BRANCH --quiet
    git reset --hard origin/$DISTRIB-$BRANCH --quiet

    # Validate constrains for the version number given (is in changelog + has corresponding tag)

    LASTVERSIONCHANGELOG=$(dpkg-parsechangelog -S Version 2>/dev/null)
    [[ "$VERSION" == "$LASTVERSIONCHANGELOG" ]] || critical "Version $VERSION is not the last version in changelog"
    git rev-parse "$TAG" >/dev/null 2>&1 || critical "Invalid version $VERSION (there's no tag $TAG in the git repo !)"

    # Get commit for the tag and for HEAD

    TAGCOMMIT=$(git rev-parse "$TAG")
    HEADCOMMIT=$(git rev-parse "HEAD")

    [[ "$TAGCOMMIT" == "$HEADCOMMIT" ]] || critical "Tag $TAG is not the HEAD of the branch :/"
}

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

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

   # Build Debian package
   boxed "Building Debian package ... "
   cd $TMP_FOLDER
   $BUILD_DEB $DISTRIB $BRANCH .
}


function main()
{
    validate_arguments

    boxed "Building $PROJECT $BRANCH release - $VERSION version"

    checkout_tag
    build
}

[[ "$1" =~ ^-h|--help$ ]] && (usage; exit 0) || main