#!/bin/bash

# This script helps to build release artifacts.
# arg1: profile, e.g. emqx | emqx-edge | emqx-pkg | emqx-edge-pkg
# arg2: artifact, e.g. tar | relup | zip | pkg

set -euo pipefail

PROFILE="$1"
ARTIFACT="$2"

# ensure dir
cd -P -- "$(dirname -- "${BASH_SOURCE[0]}")"

case "$PROFILE" in
    emqx-edge*)
	    export EMQX_DESC="EMQ X Edge"
        ;;
    emqx*)
	    export EMQX_DESC="EMQ X Broker"
        ;;
    *)
        echo "Unknown profile $PROFILE"
        exit 1
        ;;
esac

PKG_VSN="${PKG_VSN:-$(./pkg-vsn.sh)}"
export PKG_VSN

if [ "$(uname -s)" = 'Darwin' ]; then
	SYSTEM=macos
elif [ "$(uname -s)" = 'Linux' ]; then
    if grep -q -i 'centos' /etc/*-release; then
        DIST='centos'
        VERSION_ID="$(rpm --eval '%{centos_ver}')"
    else
        DIST="$(sed -n '/^ID=/p' /etc/os-release | sed -r 's/ID=(.*)/\1/g' | sed 's/"//g')"
        VERSION_ID="$(sed -n '/^VERSION_ID=/p' /etc/os-release | sed -r 's/VERSION_ID=(.*)/\1/g' | sed 's/"//g')"
    fi
    SYSTEM="$(echo "${DIST}${VERSION_ID}" | sed -r 's/([a-zA-Z]*)-.*/\1/g')"
fi

##
## Support RPM and Debian based linux systems
##
if [ "$(uname -s)" = 'Linux' ]; then
    case "${DIST:-}" in
        ubuntu|debian|raspbian)
            PKGERDIR='deb'
            ;;
        *)
            PKGERDIR='rpm'
            ;;
    esac
fi

log() {
    local msg="$1"
    # rebar3 prints ===>, so we print ===<
    echo "===< $msg"
}

make_tar() {
    ./rebar3 as "$PROFILE" tar
}

## unzip previous version .zip files to _build/$PROFILE/rel/emqx/releases before making relup
make_relup() {
    local releases_dir="_build/$PROFILE/rel/emqx/releases"
    local releases=()
    if [ -d "$releases_dir" ]; then
        while read -r dir; do
            local version
            version="$(basename "$dir")"
            # skip current version
            if [ "$version" != "$PKG_VSN" ]; then
                releases+=( "$version" )
            fi
        done < <(find "_build/$PROFILE/rel/emqx/releases" -maxdepth 1 -name '*.*.*' -type d)
    fi
    if [ ${#releases[@]} -eq 0 ]; then
        log "No previous release found, relup ignored"
        return 0
    fi
    if [ ${#releases[@]} -gt 1 ]; then
        log "Found more than one previous versions in $releases_dir:"
        log "${releases[@]}"
        log "ERROR: So far we can not support multi base-version relup creation"
        return 1
    fi
    local base_version="${releases[0]}"
    # TODO: comma separate base-versions when supported
    ./rebar3 as "$PROFILE" relup --relname emqx --relvsn "${PKG_VSN}" --upfrom "$base_version"
}

## make_zip turns .tar.gz into a .zip with a slightly different name.
## It assumes the .tar.gz has been built -- relies on Makefile dependency
make_zip() {
    tard="/tmp/emqx_untar_${PKG_VSN}"
    rm -rf "${tard}"
    mkdir -p "${tard}/emqx"
    local relpath="_build/${PROFILE}/rel/emqx"
    local pkgpath="_packages/${PROFILE}"
    mkdir -p "${pkgpath}"
    local tarball="${relpath}/emqx-${PKG_VSN}.tar.gz"
    if [ ! -f "$tarball" ]; then
        log "ERROR: $tarball is not found"
    fi
    local zipball
    zipball="${pkgpath}/${PROFILE}-${SYSTEM}-${PKG_VSN}-$(uname -m).zip"
    tar zxf "${tarball}" -C "${tard}/emqx"
    (cd "${tard}" && zip -qr - emqx) > "${zipball}"
}

log "building artifact=$ARTIFACT for profile=$PROFILE"

case "$ARTIFACT" in
    tar)
        make_tar
        ;;
    relup)
        make_relup
        ;;
    zip)
        make_zip
        ;;
    pkg)
        if [ -z "${PKGERDIR:-}" ]; then
            # zip should have been built as a Makefile dependency
            log "Skipped making deb/rpm package for $SYSTEM"
            exit 0
        fi
        # build the tar which is going to be used as the base of deb and rpm packages
        make_tar
        make -C "deploy/packages/${PKGERDIR}" clean
        EMQX_REL="$(pwd)" EMQX_BUILD="${PROFILE}" SYSTEM="${SYSTEM}" make -C "deploy/packages/${PKGERDIR}"
        ;;
    *)
        log "Unknown artifact $ARTIFACT"
        exit 1
        ;;
esac