#!/bin/sh
TS_GITHUB="https://github.com/microsoft/TypeScript"
TS_DIR="${TS_DIR:=$HOME/.local/share/typescript}"
TS_BIN="$TS_DIR/package/bin/tsc"

_prompt() {
    printf "[TS] \033[34m%s\033[0m \033[1m[y/n]:\033[0m " "$1"
    read -r opt

    case "$opt" in
        [Yy]) return 0;;
        [Nn]) return 1;;
        *)    return 1;;
    esac
}

_msg() {
    printf "[TS] \033[0m%s\033[0m\n" "$1"
}

_error() {
    printf "[TS] \033[31m%s\033[0m\n" "$1"
}

_latest_ts_version() {
    release_url="$(curl -Ls -o /dev/null -w %{url_effective} "$TS_GITHUB"/releases/latest)"
    echo "${release_url##*/v}"
}

_update_ts() {
    if ! [ -d "$TS_DIR" ]; then
        _prompt "Installation directory '$TS_DIR' does not exist, create?"
        if [ "$?" -eq 1 ]; then
            return 1
        fi
        mkdir -p "$TS_DIR"
    fi

    _msg "getting latest version..."
    version="$(_latest_ts_version)"
    if [ "$?" -eq 1 ]; then
        _error "failed to get version"
        return 1
    fi

    download_url="$TS_GITHUB/releases/download/v$version/typescript-$version.tgz"
    rm -rf "$TS_DIR"
    mkdir -p "$TS_DIR"

    _msg "downloading ts v$version..."
    curl -sLo "$TS_DIR/ts-$version.tgz" "$download_url"
    if [ "$?" -eq 1 ]; then
        _error "failed to download"
        return 1
    fi

    _msg "extracting..."
    tar xzf "$TS_DIR/ts-$version.tgz" -C "$TS_DIR"
    if [ "$?" -eq 1 ]; then
        _error "failed to extract"
        return 1
    fi
    rm -f "$TS_DIR/ts-$version.tgz"

    _msg "done!"
}

if [ -x "$TS_BIN" ]; then
    case "$1" in
        update) _update_ts ;;
        *)      $TS_BIN $@ ;;
    esac
else
    _prompt "tsc not installed, download?"
    if [ "$?" -eq 1 ]; then
        return 1
    fi

    _update_ts
fi