#!/usr/bin/env bash
# bin/compile BUILD_DIR CACHE_DIR

set -e

source $(dirname $0)/../scripts/functions

BUILD_DIR=$1
loginfo "BUILD_DIR=$BUILD_DIR"
CACHE_DIR=$2
loginfo "CACHE_DIR=$CACHE_DIR"


## CHECK BUILDPACK_GHC_BASE_URL is set
setIfUnset BUILDPACK_GHC_BASE_URL "http://www.haskell.org/ghc/dist"
setIfUnset GHC_BOOTSTRAP_VERSION "7.0.4"
setIfUnset HASKELL_PLATFORM_BASE_URL "http://lambda.haskell.org/platform/download"
setIfUnset HASKELL_PLATFORM_VERSION "2011.4.0.0"

arch=$(uname -m)
ghcver=$GHC_BOOTSTRAP_VERSION
bsdir=$CACHE_DIR/bootstrap
ghcurl="$BUILDPACK_GHC_BASE_URL/$ghcver/ghc-$ghcver-$arch-unknown-linux.tar.bz2"
platformver="$HASKELL_PLATFORM_VERSION"
platformurl="$HASKELL_PLATFORM_BASE_URL/$platformver/haskell-platform-$platformver.tar.gz"

loginfo "bootstrap directory: ${bsdir}";
loginfo "bootstrap URL: $ghcurl";

if [ -f "$bsdir.ghc.downloaded" ]; then
  loginfo "already downloaded GHC bootstrap version ${ghcver}";
else
  loginfo "downloading GHC $ghcver from $ghcurl";
  $(downloadAndExtract $bsdir $ghcurl) && \
    touch $bsdir.ghc.downloaded;
fi
# GHC source is downloaded

if [ -f "$bsdir.ghc.compiled" ]; then
  loginfo "already compiled GHC bootstrap version ${ghcver}";
else
  ghcdir="$bsdir/ghc-$ghcver"
  ghcprefix="$BUILD_DIR/bootstrap/ghc-$ghcver"
  $(configureMakeInstall $ghcdir $ghcprefix) && \
    touch $bsdir.ghc.compiled;
fi
# GHC is compiled

export PATH="$ghcprefix/bin:$PATH"
export LIBRARY_PATH="$LIBRARY_PATH:$ghcprefix/lib"
export C_INCLUDE_PATH="$C_INCLUDE_PATH:$ghcprefix/include"

if [ -f "$bsdir.platform.downloaded" ]; then
  loginfo "already downloaded GHC bootstrap version ${platformver}";
else
  loginfo "downloading Haskell Platform $platformver from $platformurl";
  $(downloadAndExtract $bsdir $platformurl) && \
    touch $bsdir.platform.downloaded;
fi
# Haskell Platform source is downloaded

if [ -f "$bsdir.platform.compiled" ]; then
  loginfo "already compiled GHC bootstrap version ${platformver}";
else
  platformdir="$bsdir/haskell-platform-$platformver"
  platformprefix="$BUILD_DIR/bootstrap/haskell-platform-$platformver"
  $(configureMakeInstall $platformdir $platformprefix) && \
    touch $bsdir.platform.compiled;
fi
# Haskell platform is compiled is compiled
export PATH="$platformprefix/bin:$PATH"