#!/bin/bash

# This script automates the installation of the cls3 tool.
# It checks for the specified version (or fetches the latest one),
# downloads the binary, and installs it on the system.

# Check for required tools: curl and tar.
# These tools are necessary for downloading and extracting the cls3 binary.
if ! command -v curl &> /dev/null; then
    echo "curl could not be found"
    exit 1
fi

if ! command -v tar &> /dev/null; then
    echo "tar could not be found"
    exit 1
fi

# Determine the version of cls3 to install.
# If no version is specified as a command line argument, fetch the latest version.
if [ -z "$1" ]; then
    VERSION=$(curl -s https://api.github.com/repos/go-to-k/cls3/releases/latest | grep '"tag_name":' | sed -E 's/.*"v([^"]+)".*/\1/')
    if [ -z "$VERSION" ]; then
        echo "Failed to fetch the latest version"
        exit 1
    fi
else
    VERSION=$1
fi

# Normalize the version string by removing any leading 'v'.
VERSION=${VERSION#v}

# Detect the architecture of the current system.
# This script supports x86_64, arm64, and i386 architectures.
ARCH=$(uname -m)
case $ARCH in
    x86_64|amd64) ARCH="x86_64" ;;
    arm64|aarch64) ARCH="arm64" ;;
    i386|i686)     ARCH="i386" ;;
    *) echo "Unsupported architecture: $ARCH"; exit 1 ;;
esac

# Detect the operating system (OS) of the current system.
# This script supports Linux, Darwin (macOS) and Windows operating systems.
OS=$(uname -s)
case $OS in
    Linux) OS="Linux" ;;
    Darwin) OS="Darwin" ;;
    MINGW*|MSYS*|CYGWIN*) OS="Windows" ;; 
    *) echo "Unsupported OS: $OS"; exit 1 ;;
esac

# Construct the download URL for the cls3 binary based on the version, OS, and architecture.
FILE_NAME="cls3_${VERSION}_${OS}_${ARCH}.tar.gz"
URL="https://github.com/go-to-k/cls3/releases/download/v${VERSION}/${FILE_NAME}"

# Download the cls3 binary.
echo "Downloading cls3..."
if ! curl -L -o "$FILE_NAME" "$URL"; then
    echo "Failed to download cls3"
    exit 1
fi

# Install cls3.
# This involves extracting the binary and moving it to /usr/local/bin.
echo "Installing cls3..."
if ! tar -xzf "$FILE_NAME"; then
    echo "Failed to extract cls3"
    exit 1
fi
if ! sudo mv cls3 /usr/local/bin/cls3; then
    echo "Failed to install cls3"
    exit 1
fi

# Clean up by removing the downloaded tar file.
rm "$FILE_NAME"

echo "cls3 installation complete."
echo "Run 'cls3 -h' to see how to use cls3."
