#! /usr/bin/env bash
# Copyright 2024 Dotanuki Labs
# SPDX-License-Identifier: MIT

set -eo pipefail

current_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

readonly github_org="https://github.com/dotanuki-labs"
readonly release="gradle-wrapper-validator/releases/latest/download"
readonly bin_name="gwv"
readonly tool_home="$HOME/bin/dotanuki"
readonly gwv="$tool_home/$bin_name"

target_path="$1"

require_target_path() {
    if [[ -z "$target_path" ]]; then
        target_path="$current_dir"
    fi

    if [[ ! -d "$target_path" ]]; then
        echo
        echo "$target_path should be an existing directory."
        echo "Usage :"
        echo "./run.sh (runs on current folder)"
        echo "./run.sh $HOME/IdeaProjects/my-project"
        echo
        exit 1
    fi
}

find_os_sulfix() {
    local os
    os="$(uname -s)"

    if [ "$os" == "Darwin" ]; then
        echo "apple-darwin"

    elif [ "$os" == "Linux" ]; then
        echo "unknown-linux-gnu"
    else
        echo "Unsupported OS -> $os"
        exit 1
    fi
}

find_machine_prefix() {
    local machine
    machine="$(uname -m)"

    if [ "$machine" == "x86_64" ]; then
        echo "$machine"

    elif [ "$machine" == "arm64" ]; then
        echo "aarch64"
    else
        echo "Unsupported architecture -> $machine"
        exit 1
    fi
}

cleanup() {
    rm -rf "$tool_home"
}

create_installation_dir() {
    cleanup
    mkdir "$tool_home"
}

download_target_bin() {
    local prefix
    prefix=$(find_machine_prefix)

    local sulfix
    sulfix=$(find_os_sulfix)

    local target="$github_org/$release/$bin_name-$prefix-$sulfix"
    curl -L --proto '=https' --tlsv1.2 -sSf --url "$target" -o "$gwv"
    chmod +x "$gwv"
}

validate_wrappers() {
    "$gwv" --path "$target_path"
    cleanup
}

echo
require_target_path
create_installation_dir
download_target_bin || cleanup
validate_wrappers || cleanup
echo