# This is an example PKGBUILD file. Use this as a start to creating your own,
# and remove these comments. For more information, see 'man PKGBUILD'.
# NOTE: Please fill out the license field for your package! If it is unknown,
# then please put 'unknown'.

# Maintainer: David Strawn <isomarcte a__t gmail d__o__t c__o__m>
pkgname='metals'
pkgver='0.5.1'
pkgrel=1
epoch=
pkgdesc='Language Server For Scala'
url='https://scalameta.org/metals/'
arch=(any)
license=('Apache')
groups=()
depends=('java-environment=8' 'findutils' 'python')
makedepends=('sbt' 'sed' 'grep' 'coreutils')
checkdepends=()
optdepends=('bloop')
provides=()
conflicts=()
replaces=()
backup=()
options=()
install=
changelog=
source=("https://github.com/scalameta/$pkgname/archive/v$pkgver.tar.gz" 'metals-client.sh' 'metals-emacs.sh' 'metals-vim.sh' 'metals-vscode.sh' 'metals-sublime.sh' 'version-fix.patch')
noextract=()
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validpgpkeys=()

prepare() {
    cd "$pkgname-$pkgver"

    # The build currently does not set the correct version unless
    # built from git with the environment variable CI set. See
    # https://github.com/scalameta/metals/issues/662
    patch -p1 -i ../version-fix.patch
}

build() {
    export COURSIER_CACHE="./.cache/coursier/v1"
    export CI="TRUE" # Needed so the build will not think it is a SNAPSHOT
    local -r _ORG_PATH="$PATH"
    local -r _SBT_DIR="./.sbt"
    local -r _SBT_IVY="./.ivy2"
    local -r _OPENJDK_JRE_8_PATH='/usr/lib/jvm/java-8-openjdk/jre/bin/'
    cd "$pkgname-$pkgver"

    # If openjdk-8 is install, attempt to use that to build. The build
    # requires a java 8 environment. It is possible that even if
    # openjdk8 is missing another java8 environment is setup, thus in
    # the event that we can't find the openjdk8 jre, we'll just use
    # whatever is set hoping that it is a version 8 jre.
    if [ -d "$_OPENJDK_JRE_8_PATH" ]
    then
        export PATH="$_OPENJDK_JRE_8_PATH:$PATH"
    else
        echo 'Unable to find OpenJDK8 JRE. Attempting with the default JRE, but if it is not a version 8 JRE this will probably fail.'
    fi

    # When run with some AUR helpers, in particular `yay`, for a
    # reason I do not understand `sbt` will regularly attempt to
    # resolve the Scala compiler in a local-preloaded-ivy cache
    # _only_, and not attempt to download it. However if you just run
    # it again, it then tries to download it. This does not happen
    # when run locally, for me at least, with makepkg or in a
    # systemd-nspawn with extra-x86_64-build.
    sbt -sbt-dir "$_SBT_DIR" -ivy "$_SBT_IVY" clean compile || sbt -sbt-dir "$_SBT_DIR" -ivy "$_SBT_IVY" clean compile

    # Reset PATH
    export PATH="$_ORG_PATH"
}

check() {
    export COURSIER_CACHE="./.cache/coursier/v1"
    export CI="TRUE" # Needed so the build will not think it is a SNAPSHOT

    local -r _SBT_DIR="./.sbt"
    local -r _SBT_IVY="./.ivy2"
    cd "$pkgname-$pkgver"
    ## Tests on most recent release currently fail
    # sbt test
}

package() {
    export COURSIER_CACHE='./.cache/coursier/v1'
    export CI="TRUE" # Needed so the build will not think it is a SNAPSHOT

    ## Constants ##
    local -r _SBT_DIR='./.sbt'
    local -r _SBT_IVY='./.ivy2'
    local -r _TARGET_DIR='/usr/share/java/metals'
    local -r _DEST_DIR="$pkgdir$_TARGET_DIR"
    local -r _BIN_DEST_DIR="$_DEST_DIR/bin"
    local -r _LIB_DEST_DIR="$_DEST_DIR/lib"
    local -r _JAR_DEST_DIR="$_DEST_DIR/jars"
    local -r _USR_BIN="$pkgdir/usr/bin"
    local -r _TEMP_FILE="$(mktemp)"
    local -r _LAUNCHER_SCRIPTS=('metals-client.sh' 'metals-emacs.sh' 'metals-vim.sh' 'metals-vscode.sh' 'metals-sublime.sh')
    local -r _OPENJDK_JRE_8_PATH='/usr/lib/jvm/java-8-openjdk/jre/bin/'
    local -r _ORG_PATH="$PATH"

    # If openjdk-8 is install, attempt to use that to build. The build
    # requires a java 8 environment. It is possible that even if
    # openjdk8 is missing another java8 environment is setup, thus in
    # the event that we can't find the openjdk8 jre, we'll just use
    # whatever is set hoping that it is a version 8 jre.
    if [ -d "$_OPENJDK_JRE_8_PATH" ]
    then
        export PATH="$_OPENJDK_JRE_8_PATH:$PATH"
    else
        echo 'Unable to find OpenJDK8 JRE. Attempting with the default JRE, but if it is not a version 8 JRE this will probably fail.'
    fi

    ## Change Into Correct Directory ##
    pushd "$pkgname-$pkgver"

    ## Create lib And bin Directories ##
    install -d "$_LIB_DEST_DIR"
    install -d "$_BIN_DEST_DIR"

    ## Install Class Files And Jars ##

    ### Determine Dependencies ###

    # If you're reading this and you know of a better way to get all
    # the dependencies from SBT directly, please let me know.
    sbt -sbt-dir "$_SBT_DIR" -ivy "$_SBT_IVY" compile 'show metals/dependencyClasspath' 2>/dev/null | grep Attributed | sed 's/^[^\*]\+\* Attributed(\([^)]\+\).*/\1/g' > "$_TEMP_FILE"
    while read dep
    do
        local _SANATIZED_DEP="${dep##*${pkgname}-$pkgver/}"
        # Sort out directories from modules from third-party jars.
        if [ -d "$_SANATIZED_DEP" ]
        then
            pushd "$_SANATIZED_DEP"
            cp -r ./* "$_LIB_DEST_DIR/"
            popd
        else
            if [ ! -e "$_JAR_DEST_DIR" ]
            then
               install -d "$_JAR_DEST_DIR"
            fi
            local _JAR_PATH="${dep##*/maven2}"

            install -D "$_SANATIZED_DEP" "$_JAR_DEST_DIR$_JAR_PATH"
        fi
    done<"$_TEMP_FILE"

    ## Install Metals Class Files ##

    install -d "$_DEST_DIR/metals"
    pushd 'metals/target/scala-2.12/classes'
    cp -r ./*  "$_DEST_DIR/metals/"
    popd

    ## Install And Symlink Launcher Scripts ##
    for launcher in "${_LAUNCHER_SCRIPTS[@]}"
    do
        local _LINK_NAME="${launcher##*/}"
        _LINK_NAME="${launcher%%.*}"
        if [ ! -e "$_USR_BIN" ]
        then
            install -d "$_USR_BIN"
        fi
        install -m 755 "../$launcher" "$_BIN_DEST_DIR"
        ln -s "$_TARGET_DIR/bin/$launcher" "$_USR_BIN/$_LINK_NAME"
    done

    ## Ensure Correct Permissions ##

    chown root:root -R "$_DEST_DIR"
    chmod u=rwX -R "$_DEST_DIR"
    chmod u=rwX -R "$_BIN_DEST_DIR"
    chmod og=rX -R "$_DEST_DIR"

    ## Cleanup ##
    rm "$_TEMP_FILE"
    popd
    # Reset PATH
    export PATH="$_ORG_PATH"
}