#!/usr/bin/env bash
# shellcheck disable=SC2155

# ------------------------------------------------------------
# Configuration: Add files and directories to backup below
# ------------------------------------------------------------
PATHS_TO_BACKUP=(
    # provide absolute paths to files and directories
    # ~ does not work here, use $HOME instead

    "$HOME/.config"
    # "/etc"
    # "/path/to/important/file.txt"
    # "/path/to/important/directory"
    # Add as many paths as you need
)

# use rsync if available, otherwise fall back to cp
cp() {
    if command -v rsync &> /dev/null; then
        command rsync -a "$@"
    else
        command cp -r "$@"
    fi
}

backup_item() {
    local path="$1"
    local backup_dir="$2"
    local timestamp="$(date +"%Y%m%d_%H%M%S")"

    # Check if the path exists
    if [ ! -e "$path" ]; then
        echo "🛑 Error: $path does not exist"
        return 1
    fi

    # Get basename of the path
    local basename="$(basename "$path")"

    # Create backup name with timestamp
    if [ -n "$backup_dir" ]; then
        # If backup directory specified, put backup there
        local backup_name="${backup_dir}/${basename}.${timestamp}.bak"

        # Ensure backup directory exists
        mkdir -p "$backup_dir"
    else
        # Otherwise put backup in same directory as original with .bak extension
        local backup_name="${path}.${timestamp}.bak"
    fi

    # Make the backup
    if [ -d "$path" ]; then
        # It's a directory
        cp "$path" "$backup_name"
        echo "✅ Directory backup created: $backup_name"
    else
        # It's a file
        cp "$path" "$backup_name"
        echo "✅ File backup created: $backup_name"
    fi
}

# Optional backup directory from command line argument
BACKUP_DIR=""
if [ $# -eq 1 ]; then
    BACKUP_DIR="$1"
    echo "ℹ️  Backup destination directory: $BACKUP_DIR"
fi

# Check if any paths are configured
if [ ${#PATHS_TO_BACKUP[@]} -eq 0 ]; then
    echo "🛑 Error: No paths configured for backup"
    echo "🛑 Please edit the script and add paths to the PATHS_TO_BACKUP array"
    exit 1
fi

echo "ℹ️  Starting backup at $(date)"

# Process each configured path
for item in "${PATHS_TO_BACKUP[@]}"; do
    backup_item "$item" "$BACKUP_DIR"
done

echo "ℹ️  Backup complete! $(date)"