#!/usr/bin/env bash

ENGINE_DIR=$1
VERSION=$2

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

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

GIT_COMMAND="git -C $ENGINE_DIR"
rpmName=docker-ce
rpmVersion="$VERSION"
rpmRelease=1

# rpmRelease versioning is as follows
# Docker 1.7.0:  version=1.7.0, release=1
# Docker 1.7.0-rc1: version=1.7.0, release=0.1.rc1
# Docker 1.7.0-cs1: version=1.7.0.cs1, release=1
# Docker 1.7.0-cs1-rc1: version=1.7.0.cs1, release=0.1.rc1
# Docker 1.7.0-dev nightly: version=1.7.0, release=0.0.YYYYMMDD.HHMMSS.gitHASH

# if we have a "-rc*" suffix, set appropriate release
if [[ "$rpmVersion" =~ .*-rc[0-9]+$ ]] ; then
    rcVersion=${rpmVersion#*-rc}
    rpmVersion=${rpmVersion%-rc*}
    rpmRelease="0.${rcVersion}.rc${rcVersion}"
fi

DOCKER_GITCOMMIT=$($GIT_COMMAND rev-parse --short HEAD)
if [ -n "$($GIT_COMMAND status --porcelain --untracked-files=no)" ]; then
    DOCKER_GITCOMMIT="$DOCKER_GITCOMMIT-unsupported"
fi

# if we have a "-dev" suffix or have change in Git, let's make this package version more complex so it works better
if [[ "$rpmVersion" == *-dev ]] || [ -n "$($GIT_COMMAND status --porcelain)" ]; then
    gitUnix="$($GIT_COMMAND log -1 --pretty='%at')"
    gitDate="$($DATE_COMMAND --date "@$gitUnix" +'%Y%m%d.%H%M%S')"
    gitCommit="$($GIT_COMMAND log -1 --pretty='%h')"
    gitVersion="git${gitDate}.0.${gitCommit}"
    # gitVersion is now something like '20150128.112847.17e840a'
    rpmVersion="${rpmVersion%-dev}"
    rpmRelease="0.0.dev.$gitVersion"
fi

# Replace any other dashes with periods
rpmVersion="${rpmVersion//-/.}"
echo $rpmVersion $rpmRelease $DOCKER_GITCOMMIT