#!/usr/bin/env bash

__scriptpath=$(cd "$(dirname "$0")"; pwd -P)
__init_tools_log=$__scriptpath/init-tools.log
__PACKAGES_DIR=$__scriptpath/packages
__TOOLRUNTIME_DIR=$__scriptpath/Tools
__DOTNET_PATH=$__TOOLRUNTIME_DIR/dotnetcli
__DOTNET_CMD=$__DOTNET_PATH/dotnet
if [ -z "$__BUILDTOOLS_SOURCE" ]; then __BUILDTOOLS_SOURCE=https://dotnet.myget.org/F/dotnet-buildtools/api/v3/index.json; fi
__BUILD_TOOLS_PACKAGE_VERSION=$(cat $__scriptpath/BuildToolsVersion.txt)
__DOTNET_TOOLS_VERSION=$(cat $__scriptpath/DotnetCLIVersion.txt)
__BUILD_TOOLS_PATH=$__PACKAGES_DIR/Microsoft.DotNet.BuildTools/$__BUILD_TOOLS_PACKAGE_VERSION/lib
__PROJECT_JSON_PATH=$__TOOLRUNTIME_DIR/$__BUILD_TOOLS_PACKAGE_VERSION
__PROJECT_JSON_FILE=$__PROJECT_JSON_PATH/project.json
__PROJECT_JSON_CONTENTS="{ \"dependencies\": { \"Microsoft.DotNet.BuildTools\": \"$__BUILD_TOOLS_PACKAGE_VERSION\" }, \"frameworks\": { \"netcoreapp1.0\": { } } }"

OSName=$(uname -s)
case $OSName in
    Darwin)
        OS=OSX
        __DOTNET_PKG=dotnet-dev-osx-x64
        ulimit -n 2048
        ;;

    Linux)
        OS=Linux
        if [ ! -e /etc/os-release ]; then
            echo "Cannot determine Linux distribution, asuming Ubuntu 14.04."
            __DOTNET_PKG=dotnet-dev-ubuntu.14.04-x64
        else
            source /etc/os-release
            __DOTNET_PKG="dotnet-dev-$ID.$VERSION_ID-x64"
        fi
        ;;

    *)
        echo "Unsupported OS '$OSName' detected. Downloading ubuntu-x64 tools."
        OS=Linux
        __DOTNET_PKG=dotnet-dev-ubuntu-x64
        ;;
esac

display_error_message()
{
    echo "Please check the detailed log that follows." 1>&2
    cat "$__init_tools_log" 1>&2
}

if [ ! -e $__PROJECT_JSON_FILE ]; then
    if [ -e $__TOOLRUNTIME_DIR ]; then rm -rf -- $__TOOLRUNTIME_DIR; fi
    echo "Running: $__scriptpath/init-tools.sh" > $__init_tools_log
    if [ ! -e $__DOTNET_PATH ]; then
        echo "Installing dotnet cli..."
        __DOTNET_LOCATION="https://dotnetcli.blob.core.windows.net/dotnet/preview/Binaries/${__DOTNET_TOOLS_VERSION}/${__DOTNET_PKG}.${__DOTNET_TOOLS_VERSION}.tar.gz"
        # curl has HTTPS CA trust-issues less often than wget, so lets try that first.
        echo "Installing '${__DOTNET_LOCATION}' to '$__DOTNET_PATH/dotnet.tar'" >> $__init_tools_log
        which curl > /dev/null 2> /dev/null
        if [ $? -ne 0 ]; then
            mkdir -p "$__DOTNET_PATH"
            wget -q -O $__DOTNET_PATH/dotnet.tar ${__DOTNET_LOCATION}
        else
            curl --retry 10 -sSL --create-dirs -o $__DOTNET_PATH/dotnet.tar ${__DOTNET_LOCATION}
        fi
        cd $__DOTNET_PATH
        tar -xf $__DOTNET_PATH/dotnet.tar

        cd $__scriptpath
    fi

    if [ ! -d "$__PROJECT_JSON_PATH" ]; then mkdir "$__PROJECT_JSON_PATH"; fi
    echo $__PROJECT_JSON_CONTENTS > "$__PROJECT_JSON_FILE"

    if [ ! -e $__BUILD_TOOLS_PATH ]; then
        echo "Restoring BuildTools version $__BUILD_TOOLS_PACKAGE_VERSION..."
        echo "Running: $__DOTNET_CMD restore \"$__PROJECT_JSON_FILE\" --packages $__PACKAGES_DIR --source $__BUILDTOOLS_SOURCE" >> $__init_tools_log
        $__DOTNET_CMD restore "$__PROJECT_JSON_FILE" --packages $__PACKAGES_DIR --source $__BUILDTOOLS_SOURCE >> $__init_tools_log
        if [ ! -e "$__BUILD_TOOLS_PATH/init-tools.sh" ]; then 
            echo "ERROR: Could not restore build tools correctly." 1>&2
            display_error_message
        fi
    fi

    echo "Initializing BuildTools..."
    echo "Running: $__BUILD_TOOLS_PATH/init-tools.sh $__scriptpath $__DOTNET_CMD $__TOOLRUNTIME_DIR" >> $__init_tools_log
    $__BUILD_TOOLS_PATH/init-tools.sh $__scriptpath $__DOTNET_CMD $__TOOLRUNTIME_DIR >> $__init_tools_log
    if [ "$?" != "0" ]; then
        echo "ERROR: An error occured when trying to initialize the tools." 1>&2
        display_error_message
    fi
    echo "Done initializing tools."
else
    echo "Tools are already initialized"
fi