#!/bin/sh

msg() {
    echo "configure: $1"
}

step_msg() {
    msg
    msg "$1"
    msg
}

warn() {
    echo "configure: WARNING: $1"
}

err() {
    echo "configure: error: $1"
    exit 1
}

need_ok() {
    if [ $? -ne 0 ]
    then
        err $1
    fi
}

need_cmd() {
    if which $1 >/dev/null 2>&1
    then msg "found $1"
    else err "need $1"
    fi
}

make_dir() {
    if [ ! -d $1 ]
    then
        msg "mkdir -p $1"
        mkdir -p $1
    fi
}

copy_if_changed() {
    if cmp -s $1 $2
    then
        msg "leaving $2 unchanged"
    else
        msg "cp $1 $2"
        cp -f $1 $2
        chmod u-w $2 # make copied artifact read-only
    fi
}

move_if_changed() {
    if cmp -s $1 $2
    then
        msg "leaving $2 unchanged"
    else
        msg "mv $1 $2"
        mv -f $1 $2
        chmod u-w $2 # make moved artifact read-only
    fi
}

putvar() {
    local T
    eval T=\$$1
    eval TLEN=\${#$1}
    if [ $TLEN -gt 35 ]
    then
        printf "configure: %-20s := %.35s ...\n" $1 "$T"
    else
        printf "configure: %-20s := %s %s\n" $1 "$T" "$2"
    fi
    printf "%-20s := %s\n" $1 "$T" >>${CFG_SRC_DIR}config.tmp
}

probe() {
    local V=$1
    shift
    local P
    local T
    for P
    do
        T=$(which $P 2>&1)
        if [ $? -eq 0 ]
        then
            VER0=$($P --version 2>/dev/null | head -1 \
                |  sed -e 's/[^0-9]*\([vV]\?[0-9.]\+[^ ]*\).*/\1/' )
            if [ $? -eq 0 -a "x${VER0}" != "x" ]
            then
              VER="($VER0)"
            else
              VER=""
            fi
            break
        else
            VER=""
            T=""
        fi
    done
    eval $V=\$T
    putvar $V "$VER"
}

probe_need() {
    local V=$1
    probe $*
    eval VV=\$$V
    if [ -z "$VV" ]
    then
        err "needed, but unable to find any of: $*"
    fi
}

valopt() {
    local OP=$1
    local DEFAULT=$2
    shift
    shift
    local DOC="$*"
    if [ $HELP -eq 0 ]
    then
        local UOP=$(echo $OP | tr '[:lower:]' '[:upper:]' | tr '\-' '\_')
        local V="CFG_${UOP}"
        eval $V="$DEFAULT"
        for arg in $CFG_CONFIGURE_ARGS
        do
            if echo "$arg" | grep -q -- "--$OP="
            then
                val=$(echo "$arg" | cut -f2 -d=)
                eval $V=$val
            fi
        done
        putvar $V
    else
        if [ -z "$DEFAULT" ]
        then
            DEFAULT="<none>"
        fi
        OP="${OP}=[${DEFAULT}]"
        printf "    --%-30s %s\n" "$OP" "$DOC"
    fi
}

opt() {
    local OP=$1
    local DEFAULT=$2
    shift
    shift
    local DOC="$*"
    local FLAG=""

    if [ $DEFAULT -eq 0 ]
    then
        FLAG="enable"
    else
        FLAG="disable"
        DOC="don't $DOC"
    fi

    if [ $HELP -eq 0 ]
    then
        for arg in $CFG_CONFIGURE_ARGS
        do
            if [ "$arg" = "--${FLAG}-${OP}" ]
            then
                OP=$(echo $OP | tr 'a-z-' 'A-Z_')
                FLAG=$(echo $FLAG | tr 'a-z' 'A-Z')
                local V="CFG_${FLAG}_${OP}"
                eval $V=1
                putvar $V
            fi
        done
    else
        if [ ! -z "$META" ]
        then
            OP="$OP=<$META>"
        fi
        printf "    --%-30s %s\n" "$FLAG-$OP" "$DOC"
     fi
}

msg "looking for configure programs"
need_cmd cmp
need_cmd mkdir
need_cmd printf
need_cmd cut
need_cmd grep
need_cmd xargs
need_cmd cp
need_cmd find
need_cmd uname
need_cmd date
need_cmd tr
need_cmd sed

msg "inspecting environment"

CFG_OSTYPE=$(uname -s)
case $CFG_OSTYPE in
    Linux)
        CFG_OSTYPE=linux
        ;;

    FreeBSD)
        CFG_OSTYPE=freebsd
        ;;

    Darwin)
        CFG_OSTYPE=darwin
        ;;

    MINGW32*)
        CFG_OSTYPE=mingw32
        ;;
    *)
        err "unknown OS type: $CFG_OSTYPE"
        ;;
esac


CFG_SRC_DIR="$(cd $(dirname $0) && pwd)/"
CFG_BUILD_DIR="$(pwd)/"
CFG_SELF=${CFG_SRC_DIR}$(basename $0)
CFG_CONFIGURE_ARGS="$@"

OPTIONS=""
HELP=0
if [ "$1" = "--help" ]
then
    HELP=1
    shift
    echo ""
    echo "Usage: $CFG_SELF [options]"
    echo ""
    echo "Options:"
    echo ""
else
    msg "recreating config.tmp"
    echo '' >${CFG_SRC_DIR}config.tmp

    step_msg "processing $CFG_SELF args"
fi

opt optimize 1 "build optimized rust code"
opt optimize-cxx 1 "build optimized C++ code"
opt manage-submodules 1 "let the build manage the git submodules"
opt fast-make 0 "use .gitmodules as timestamp for submodule deps"
valopt local-rust-root "/usr/local" "set prefix for local rust binary"

if [ $HELP -eq 1 ]
then
    echo ""
    exit 0
fi

step_msg "looking for build programs"

probe_need CFG_GIT         git
probe CFG_CLANG            clang++
probe CFG_GCC              gcc
probe CFG_LD               ld
# Spidermonkey requires autoconf 2.13 exactly
probe_need CFG_AUTOCONF213 autoconf213  \
                           autoconf2.13 \
                           autoconf-2.13

if [ ! -z "$CFG_ENABLE_LOCAL_RUST" ]
then
    if [ ! -f ${CFG_LOCAL_RUST_ROOT}/bin/rustc ]
    then
        err "no local rust to use"
    else
        LRV=`${CFG_LOCAL_RUST_ROOT}/bin/rustc --version`
        step_msg "using rustc at: ${CFG_LOCAL_RUST_ROOT} with version: " $LRV
	CFG_RUSTC = ${CFG_LOCAL_RUST_ROOT}/bin/rustc
    fi
else
    probe CFG_RUSTC rustc
fi

if [ ! -z "$CFG_ENABLE_CLANG" ]
then
    if [ -z "$CFG_CLANG" ]
    then
	err "clang requested but not found"
    fi
    CFG_CLANG_VERSION=$("$CFG_CLANG" \
                      --version \
                      | grep version \
                      | sed 's/.*\(version .*\)/\1/' \
                      | cut -d ' ' -f 2)

    case $CFG_CLANG_VERSION in
        (3.0svn | 3.0 | 3.1 | 4.0)
        step_msg "found ok version of CLANG: $CFG_CLANG_VERSION"
        CFG_C_COMPILER="clang"
        ;;
        (*)
        err "bad CLANG version: $CFG_CLANG_VERSION, need >=3.0svn"
        ;;
    esac
else
    CFG_C_COMPILER="gcc"
fi

if [ -z "$CFG_ENABLE_CLANG" -a -z "$CFG_GCC" ]
then
    err "either clang or gcc is required"
fi

# Configure submodules
step_msg "configuring submodules"

# Have to be in the top of src directory for this
if [ -z $CFG_DISABLE_MANAGE_SUBMODULES ]
then
    cd ${CFG_SRC_DIR}

    msg "git: submodule sync"
    "${CFG_GIT}" submodule --quiet sync

    # NB: this is just for the sake of getting the submodule SHA1 values
    # and status written into the build log.
    msg "git: submodule status"
    "${CFG_GIT}" submodule status --recursive

    msg "git: submodule update"
    "${CFG_GIT}" submodule --quiet update --init --recursive
    need_ok "git failed"

    msg "git: submodule clobber"
    "${CFG_GIT}" submodule --quiet foreach --recursive git clean -dxf
    need_ok "git failed"
    "${CFG_GIT}" submodule --quiet foreach --recursive git checkout .
    need_ok "git failed"

    cd ${CFG_BUILD_DIR}
fi

step_msg "running submodule autoconf scripts"

(cd ${CFG_SRC_DIR}src/mozjs/js/src && "${CFG_AUTOCONF213}") || exit $?

CFG_SUBMODULES="libwapcaplet rust-harfbuzz rust-opengles rust-azure rust-stb-image rust-geom rust-glut rust-layers rust-http-client libparserutils libhubbub libcss servo-sandbox rust-hubbub sharegl rust-mozjs mozjs"

if [ $CFG_OSTYPE = "darwin" ]
then
CFG_SUBMODULES="rust-cocoa rust-io-surface rust-core-foundation ${CFG_SUBMODULES}"
fi

# needed because Spidermonkey configure is in non-standard location
CFG_CONFIGURE_PATHS="${CFG_SUBMODULES} mozjs/js/src/"

step_msg "making build directories"

cd "${CFG_BUILD_DIR}"

for i in ${CFG_SUBMODULES}
do
    make_dir ${CFG_BUILD_DIR}src/${i}
done

make_dir src/test/ref

# TODO: don't run configure on submodules unless necessary. For an example,
# see how Rust's configure script optionally reconfigures the LLVM module.
step_msg "running submodule configure scripts"

for i in ${CFG_CONFIGURE_PATHS}
do
    if [ -d ${CFG_BUILD_DIR}src/${i} ]
    then
	cd ${CFG_BUILD_DIR}src/${i}
    fi
    CONFIGURE_SCRIPT="${CFG_SRC_DIR}src/${i}/configure"
    if [ -f ${CONFIGURE_SCRIPT} ]
    then
	sh ${CONFIGURE_SCRIPT}
    fi
done

step_msg "writing configuration"

putvar CFG_OSTYPE
putvar CFG_SRC_DIR
putvar CFG_BUILD_DIR
putvar CFG_CONFIGURE_ARGS
putvar CFG_C_COMPILER
putvar CFG_SUBMODULES
putvar CFG_DISABLE_MANAGE_SUBMODULES

msg
copy_if_changed ${CFG_SRC_DIR}Makefile.in ${CFG_BUILD_DIR}Makefile
move_if_changed ${CFG_SRC_DIR}config.tmp ${CFG_SRC_DIR}config.mk
copy_if_changed ${CFG_SRC_DIR}config.mk ${CFG_BUILD_DIR}config.mk
rm -f ${CFG_SRC_DIR}config.tmp
touch ${CFG_SRC_DIR}config.stamp

step_msg "complete"