#!/bin/bash

set -euo pipefail

# Detect architecture
ARCH=$(uname -m)
case "$ARCH" in
    x86_64)
        ARCH="x86_64"
        ;;
    aarch64|arm64)
        ARCH="aarch64"
        ;;
    *)
        echo "Unsupported architecture: $ARCH"
        exit 1
        ;;
esac

# Detect OS
OS=$(uname -s | tr '[:upper:]' '[:lower:]')
if [ "$OS" != "linux" ]; then
    echo "This installer only supports Linux. Detected OS: $OS"
    exit 1
fi

# Set installation directory
INSTALL_DIR="${HOME}/.local/bin"
INSTALL_PATH="${INSTALL_DIR}/dshash"

# Create installation directory if it doesn't exist
mkdir -p "${INSTALL_DIR}"

# Download dshash binary
echo "Downloading dshash for ${OS}/${ARCH}..."
DOWNLOAD_URL="https://getbin.xyz/dshash:latest-${ARCH}"

if command -v curl >/dev/null 2>&1; then
    curl -L -s -o "${INSTALL_PATH}" "${DOWNLOAD_URL}"
elif command -v wget >/dev/null 2>&1; then
    wget -q -O "${INSTALL_PATH}" "${DOWNLOAD_URL}"
else
    echo "Error: Neither curl nor wget is available. Please install one of them."
    exit 1
fi

# Make it executable
chmod +x "${INSTALL_PATH}"

# Verify installation
if "${INSTALL_PATH}" /dev/null 2>/dev/null; then
    echo "dshash has been successfully installed to ${INSTALL_PATH}"
    
    # Check if directory is in PATH
    if [[ ":$PATH:" != *":${INSTALL_DIR}:"* ]]; then
        echo ""
        echo "Note: ${INSTALL_DIR} is not in your PATH."
        echo "Add the following line to your shell configuration file (.bashrc, .zshrc, etc.):"
        echo "  export PATH=\"${INSTALL_DIR}:\$PATH\""
    fi
else
    echo "Error: Installation verification failed"
    exit 1
fi

echo ""
echo "Installation complete! You can now use 'dshash' to compute SHA256 hashes."
echo "Usage: dshash [-v] <file_or_directory>"