# PIPED INPUT HANDLING
# read directly from standard input when no arguments are provided
if [ ! -t 0 ] && [ $# -eq 0 ]; then
    wl-copy
    return 0
fi

# ARGUMENT VALIDATION
# ensure at least one file argument is passed when not piping
if [ $# -eq 0 ]; then
    echo "usage: copy <file...> or <command> | copy" >&2
    return 1
fi

# FILE EXISTENCE CHECK
# verify the target argument is a readable file
if [ ! -r "$1" ]; then
    echo "error: cannot read file '$1'" >&2
    return 1
fi

# MIME TYPE DETECTION
# inspect the file header to determine the correct clipboard target
local mime_type
mime_type=$(file --mime-type -b "$1")

# CLIPBOARD DISPATCH
# route the file to wl-copy with the appropriate target flags
case "$mime_type" in
    image/png|image/jpeg|image/webp|image/gif|image/bmp)
        wl-copy -t "$mime_type" < "$1"
        echo "copied $1 ($mime_type) to clipboard."
        ;;
    image/svg+xml)
        if command -v rsvg-convert >/dev/null 2>&1; then
            rsvg-convert "$1" | wl-copy -t image/png
            echo "rasterised $1 to png and copied to clipboard."
        else
            wl-copy -t image/svg+xml < "$1"
            echo "copied $1 (raw svg) to clipboard. install librsvg for automatic png rasterisation."
        fi
        ;;
    *)
        cat "$@" | wl-copy
        echo "copied text content ($# file(s)) to clipboard."
        ;;
esac