#!/usr/bin/env bash

ENGINE_DIR="$1"
VERSION="$2"
origVersion=$VERSION

SUFFIX=${SUFFIX:=ce}

[[ $# < 2 ]] && echo 'not enough args' && exit 1

DATE_COMMAND="date"
if [[ $(uname) -eq "Darwin" ]]; then
    DATE_COMMAND="docker run --rm alpine date"
fi

gen_deb_version() {
    # Adds an increment to the deb version to get proper order
    # 18.01.0-${SUFFIX}-tp1   -> 18.01.0-${SUFFIX}-0.1-tp1
    # 18.01.0-${SUFFIX}-beta1 -> 18.01.0-${SUFFIX}-1.1-beta1
    # 18.01.0-${SUFFIX}-rc1   -> 18.01.0-${SUFFIX}-2.1-rc1
    # 18.01.0-${SUFFIX}       -> 18.01.0-${SUFFIX}-3
    fullVersion="$1"
    pattern="$2"
    increment="$3"
    testVersion="${fullVersion#*-$SUFFIX-*$pattern}"
    baseVersion="${fullVersion%-"$pattern"*}"
    echo "$baseVersion-$increment.$testVersion.$pattern$testVersion"
}

case "$VERSION" in
    *-dev)
        debVersion="$VERSION"
        ;;
    *-tp[0-9]*)
        debVersion="$(gen_deb_version "$VERSION" tp 0)"
        ;;
    *-beta[0-9]*)
        debVersion="$(gen_deb_version "$VERSION" beta 1)"
        ;;
    *-rc[0-9]*)
        debVersion="$(gen_deb_version "$VERSION" rc 2)"
        ;;
    *)
        debVersion="$VERSION-3"
        ;;
esac

export TZ=UTC

tilde='~' # ouch Bash 4.2 vs 4.3, you keel me
# git running in different directories, backwards compatible too
GIT_COMMAND="git -C $ENGINE_DIR"
debVersion="${debVersion//-/$tilde}" # using \~ or '~' here works in 4.3, but not 4.2; just ~ causes $HOME to be inserted, hence the $tilde
# if we have a "-dev" suffix or have change in Git, let's make this package version more complex so it works better
if [[ "$VERSION" == *-dev ]]; then
    gitUnix="$($GIT_COMMAND log -1 --pretty='%at')"
    gitDate="$($DATE_COMMAND --date "@$gitUnix" +'%Y%m%d.%H%M%S')"
    gitCommit="$($GIT_COMMAND log -1 --pretty='%h')"
    debVersion="0.${gitDate}-${gitCommit}"
    origVersion=$debVersion

    # $ dpkg --compare-versions 1.5.0 gt 1.5.0~rc1 && echo true || echo false
    # true
    # $ dpkg --compare-versions 1.5.0~rc1 gt 1.5.0~git20150128.112847.17e840a && echo true || echo false
    # true
    # $ dpkg --compare-versions 1.5.0~git20150128.112847.17e840a gt 1.5.0~dev~git20150128.112847.17e840a && echo true || echo false
    # true

    # ie, 1.5.0 > 1.5.0~rc1 > 1.5.0~git20150128.112847.17e840a > 1.5.0~dev~git20150128.112847.17e840a
fi

echo "$debVersion" "$origVersion"