#!/usr/bin/env bash
set -e

architecture() {
    case `uname -m` in
        x86_64)
            echo x86_64
            ;;
        i686 | i386)
            echo i686
            ;;
        #Probably expand out more options for arm and aarch64
        armv7*)
            echo arm32
            ;;
        aarch64)
            echo arm64
            ;;
        *)
            error "unknown architecture detected"
            ;;
    esac
}

get_os() {
    case `uname -s` in
        Linux)
            case `uname -o` in
                Android)
                    echo Android
                    ;;
                GNU/Linux)
                    echo Linux
                    ;;
            esac
            ;;
        MINGW* | MSYS* | CYGWIN*)
            echo Windows
            ;;
        Darwin)
            echo Darwin
            ;;
    esac
}

system() {
    case $(get_os) in
        Linux)
            echo linux
            ;;
        Android)
            echo android
            ;;
        Darwin)
            echo apple
            ;;
        Windows)
            echo pc-windows-msvc
            ;;
        *)
            error "machine os type is not supported"
            ;;
    esac
}

get_latest_version() {
  curl --silent "https://api.github.com/repos/foundpatterns/torchbear/releases/latest" |
    grep '"tag_name":' |
    sed -E 's/.*"([^"]+)".*/\1/'
}

get_url() {
    local arch=$(architecture)
    local os=$(system)
    #Maybe instead of getting the latest version, we could get the latest stable release instead to reduce the chance of
    #exposed bugs being sent to users
    local version=$(get_latest_version)
    #TODO: Use github api to get the uri for the download instead.
    echo "https://github.com/foundpatterns/torchbear/releases/download/${version}/torchbear-${version}-${arch}-${os}-stable.zip"
}

download_and_extract() {
    if [ ! -d $1 ]; then
        error "Path or directory does not exist."
    fi

    if [ -x "$(command -v curl)" ]; then
        curl -L $(get_url) -o temp.zip
        case $(get_os) in
            Linux | Darwin )
                sudo unzip -o temp.zip -d $1
                ;;
            * )
                unzip -o temp.zip -d $1
                ;;
        esac
        rm temp.zip
    else
        error "Curl is not installed. Please install curl. If curl is installed, check your path and try again"
    fi

}

install_machu_picchu () {
    URL="https://github.com/foundpatterns/mp-installer/archive/master.zip"
    TEMP=temp.zip
    DIR=.mp-installer

    if [ -x "$(command -v curl)" ]; then
        echo Downloading Machu Picchu
        curl -L $URL -o $TEMP
        echo Installing Machu Picchu
        mkdir $DIR
        unzip -q -o temp.zip -d $DIR
        rm $TEMP
        cd $DIR/mp-installer-master
        case $(get_os) in
            Linux | Darwin ) sudo torchbear;;
            * ) torchbear;;
        esac
        STATUS=$?
        cd ../..
        rm -rf $DIR
    else
        error "Curl is not installed. Please install curl. If curl is installed, check your path and try again"
    fi

    if [ $STATUS = "0" ]; then
        echo Machu Picchu installed succesfully
    else
        error Machu Picchu install was unsuccesfull
    fi
}

install_path() {
    case $(get_os) in
        Linux | Darwin)
            echo "/usr/local/bin"
            ;;
        Android)
            echo "/data/data/com.termux/files/usr/bin"
            ;;
        Windows)
            if [ -d "$CMDER_ROOT" ]; then
                echo "$CMDER_ROOT/bin"
            else
                error Cmder is required to run this installer.
            fi
            ;;
        *)
            error "System is not supported at this time"
            ;;
    esac
}

torchbear_path() {
    case $(get_os) in
        Linux | Darwin | Android)
            echo "$(install_path)/torchbear"
            ;;
        Windows)
            echo "$(install_path)/torchbear.exe"
            ;;
    esac
}

uninstall_torchbear() {
    if [ -f "$(torchbear_path)" ]; then
        echo Uninstalling Torchbear.
        case $(get_os) in
            Linux | Darwin)
                sudo rm $(torchbear_path)
                ;;
            * )
                rm $(torchbear_path)
                ;;
        esac
        if [ -f "$(torchbear_path)" ]; then
            error Torchbear could not be uninstalled.
        else
            echo Torchbear is now uninstalled.
        fi
    else
        error Torchbear is not installed.
    fi
}

uninstall_mp() {
    if [ -f "$(install_path)/mp" ]; then
        echo Uninstalling machu picchu.
        case $(get_os) in
            Linux | Darwin)
                sudo rm $(install_path)/mp
                sudo rm -rf $(install_path)/machu-pichu
                ;;
            * )
                rm $(install_path)/mp
                rm -rf $(install_path)/machu-pichu
                ;;
        esac
        if [ -f "$(install_path)/mp" ]; then
            error Machu Picchu could not be uninstalled.
        else
            echo Machu Picchu is now uninstalled.
        fi
    else
        error Machu Picchu is not installed.
    fi
}

install_torchbear() {
    if [ -f "$(torchbear_path)" ]; then
	    local curr_version=($(echo $($(torchbear_path) -V)))
	    local repo_version=$(get_latest_version)

	    if [ "${curr_version[1]}" == "$repo_version" ]; then
            error "Torchbear is up to date."
	    fi
        echo "New version of available"
        echo "Current Version: ${curr_version[1]}"
        echo "Latest Version: $repo_version"
    fi

    echo Downloading torchbear

    download_and_extract $(install_path)

    if [ -f "$(torchbear_path)" ]; then
	    local version=($(echo $($(torchbear_path) -V)))
        echo Torchbear ${version[1]} has been installed.
    fi
}

install_mp() {
    if [ -f "$(torchbear_path)" ]; then

        # Only install mp if not detected
        # TODO: Check for updates for mp
        if [ ! -x "$(command -v mp)" ]; then
            echo "Now that you have Torchbear installed, would you like to install Machu Picchu package manager? You can use it to install more apps, safely and easily."
            echo "To read more about it, check http://github.com/foundpatterns/machu-picchu. If you choose to install now, then running mp --help will show you what to do next with it"

            read -t 10 -e -p "Do you want to install machu-picchu (Y/n)? " -i "Y" choice </dev/tty || choice="N"

            case "$choice" in
                y|Y )
                    install_machu_picchu
                    ;;
                n|N )
                    # Ignore
                    ;;
                * ) echo "Invalid option";;
            esac
        fi
    else
        error Torchbear is not installed.
    fi
}

error() { echo "$*" 1>&2 ; exit 1; }

case $1 in
    "--install-torchbear")
        install_torchbear
    ;;
    "--install-mp")
        install_mp
    ;;
    "--uninstall")
        uninstall_torchbear
        uninstall_mp
    ;;
    "--uninstall-mp")
        uninstall_mp
    ;;
    * )
        install_torchbear
        install_mp
    ;;
esac