#!/bin/bash

GIT_URL="https://github.com/matrix-org/dendrite.git"

SCRIPT_PATH=$(dirname $(realpath $0))

REPO_DIR="${SCRIPT_PATH}/repo"
PACK_DIR="${SCRIPT_PATH}/package"


BUILD_DIR="$REPO_DIR/bin"
ROOTFS="${SCRIPT_PATH}/rootfs"
TARGET_TAG=""

ACTION="initialze"

function err_occur {
    echo "Error occurred in $ACTION"
}
trap err_occur ERR
set -o errexit
set -o errtrace

function usage()
{
    echo "$0 usage:"
    echo "  -b the build release number"
    echo "  -t specify the tag to build, instead of the latest one"
}

BUILD_REL=""
while getopts ":b:t:" arg
do
    case "$arg" in
        b)
            BUILD_REL="$OPTARG"
            ;;
        t)
            TARGET_TAG="$OPTARG"
            ;;
        *)
            usage
            exit 1
            ;;
    esac
done

function download()
{
    ACTION="download"
    echo "downloading/update sources..."

    if [ ! -d "$REPO_DIR" ]
    then
        git clone "$GIT_URL" "$REPO_DIR"
    else
        git -C "$REPO_DIR" fetch --all
    fi

}

function switch_tag()
{
    ACTION="switch tag"
    if [ -z "$TARGET_TAG" ]
    then
        TARGET_TAG=$(git -C "$REPO_DIR" tag --sort=-version:refname --list 'v*' | head -n 1)
    fi

    echo "switching to tag: $TARGET_TAG"
    git -C "$REPO_DIR" switch --force-create build "$TARGET_TAG"
    echo "cleaning workspace..."
    git -C "$REPO_DIR" clean --force -xd
}

function build()
{
    ACTION="build"
    echo "building the program..."

    cd "$REPO_DIR"
    bash build.sh
}

function package()
{
    ACTION="package"
    echo "packaging the binaries..."

    rm -rf "$ROOTFS"/*

    install -D -t $ROOTFS/usr/local/lib/dendrite   $BUILD_DIR/*
    install -D -t $ROOTFS/etc/dendrite             $REPO_DIR/dendrite-sample.yaml

    export VERSION=$($BUILD_DIR/dendrite --version)
    if [ -n "${BUILD_REL}" ]
    then
        VERSION=$VERSION-brel$BUILD_REL
    fi


    mkdir -p $ROOTFS/DEBIAN
    sed "s/+++VERSION+++/${VERSION}/" > $ROOTFS/DEBIAN/control << EOF
Package: dendrite
Version: +++VERSION+++
Priority: optional
Architecture: all
Maintainer: leafee98 <me@leafee98.com>
Description: Dendrite is a second-generation Matrix homeserver written in Go! 
  Dendrite is a second-generation Matrix homeserver written in Go. It intends to provide an efficient, reliable and scalable alternative to Synapse.
EOF

    mkdir -p "$PACK_DIR"
    dpkg-deb --build --root-owner-group $ROOTFS $PACK_DIR/dendrite-$VERSION.deb
}


download
switch_tag
build
package