#! /usr/bin/sh

# Needs to be updated each version bump
VERSION="0.3.0"

DOWNLOAD_LOCATION="/tmp/ouch-binary"
INSTALLATION_LOCATION="/usr/local/bin/ouch"
REPO_URL="https://github.com/ouch-org/ouch"

# Panics script if anything fails
set -e

abort() {
    echo "error occurred, aborting." ; exit 1
}

install() {
    echo "Ouch v$VERSION."

    printf "Detected system: "
    # System detection from https://stackoverflow.com/a/27776822/9982477
    # Go there to see a full table of what `uname -s` might output
    case "$(uname -s)" in
        Linux)
            echo "Linux."
            system_suffix="-linux-musl"
        ;;

        Darwin)
            echo "Mac OS X."
            system_suffix="-apple-darwin"
        ;;

        CYGWIN*|MINGW32*|MSYS*|MINGW*)
            echo "Windows."
            system_suffix="-pc-windows-msvc.exe"
        ;;

        *)
            echo "ERROR."
            echo "This script only works for installing on Linux, Mac OS and Windows."
            echo "We found '$(uname -s)' instead."
            echo ""
            echo "To install 'ouch' you can opt for other installation method"
            echo "listed at $REPO_URL"
            echo ""
            echo "If you think this is an error, please open an issue"
            exit 1
        ;;
    esac

    binary_file_name="ouch-x86_64${system_suffix}"
    binary_url="https://github.com/ouch-org/ouch/releases/download/${VERSION}/${binary_file_name}"

    echo ""

    # Set $downloader
    if [ $(which curl) ]; then
        downloader="curl"
        downloader_command="curl -fSL $binary_url -o $DOWNLOAD_LOCATION"
    elif [ $(which wget) ]; then
        downloader="wget"
        downloader_command="wget $binary_url -O $DOWNLOAD_LOCATION"
    else
        echo "ERROR: have not found 'curl' nor 'wget' to donwload ouch binary."
        exit 1
    fi

    if [ -f "$DOWNLOAD_LOCATION" ]; then
        echo "Reusing downloaded binary at '$DOWNLOAD_LOCATION'."
    else
        echo "Downloading binary to '$DOWNLOAD_LOCATION' with $downloader."
        echo "From $binary_url"
        # Run command to download binary
        $downloader_command
    fi

    echo ""

    if [ "$USER" = "root" ]; then
        echo "Detected root user, trying to copy $DOWNLOAD_LOCATION to $INSTALLATION_LOCATION."
        cp $DOWNLOAD_LOCATION $INSTALLATION_LOCATION
        chmod +x $INSTALLATION_LOCATION
    else
        echo "Asking for \"sudo\" permissions to finish installation."
        echo "Permission is needed to copy '$DOWNLOAD_LOCATION' to '$INSTALLATION_LOCATION'"

        sudo cp $DOWNLOAD_LOCATION $INSTALLATION_LOCATION
        sudo chmod +x $INSTALLATION_LOCATION
    fi

    echo ""

    echo "Successfully installed!"
    echo "See $REPO_URL for usage instructions."
}

install