#!/bin/sh

SCRIPT="$(basename "$0")"

long='width,verbose,help'
short='wvh'

if ! opts="$(getopt -o $short -l $long -n "$SCRIPT" -- "$@")"; then
	exit 1
fi

eval set -- "$opts"

help() {
	cat <<-EOF
		$SCRIPT
		Toby Vincent <tobyv@tobyvin.dev>

		$SCRIPT
		    Filter script used for lesspipe.sh filtering

		USAGE:
		    $SCRIPT [OPTION ...] <PATH> [PATH ...]

		OPTIONS:
		    -w, --width           Specify width. By default uses FZF_PREVIEW_COLUMNS if
		                              set, and falls back to COLUMNS
		    -v, --verbose         Increase verbosity
		    -h, --help            Show this help
	EOF
}

say() {
	if [ -z "$LESSQUIET" ]; then
		printf "%s: %s\n" "$SCRIPT" "$*"
	fi
}

say_verbose() {
	if [ "$verbose" -gt "0" ]; then
		say "$*"
	fi
}

say_err() {
	say "$*" >&2
}

err() {
	err_dir="$1"
	shift
	say_err "cannot preview '$err_dir': $*"
	exit 1
}

err_help() {
	help
	err "$*"
}

has() {
	command -v "$1" >/dev/null
}

in_git_repo() {
	[ -d "$1/.git" ] || git -C "$1" rev-parse --is-inside-work-tree >/dev/null 2>&1
}

filetype() {
	case "$1" in
	https://git.sr.ht*) ftype="sourcehut" ;;
	https://github.com*) ftype="github" ;;
	*.md | *.MD | *.mkd | *.markdown | *.rst) ftype='markdown' ;;
	/*) [ -d "$1" ] && ftype='directory' ;;
	"${1%/*}/${1#*/}")
		for remote in ${GIT_REMOTES:-https://git.sr.ht https://github.com}; do
			if git ls-remote "$remote/$1" CHECK_GIT_REMOTE_URL_REACHABILITY; then
				ftype=$(filetype "$remote/$1")
				break
			fi
		done
		;;
	esac

	printf %s\\n "$ftype"
}

verbose=0
width=${FZF_PREVIEW_COLUMNS:-$COLUMNS}
while true; do
	case "$1" in
	-h | --help)
		help
		exit 0
		;;
	-v | --verbose)
		verbose=$((verbose + 1))
		shift
		;;
	-w | --width)
		width=$2
		shift 2
		;;
	--)
		shift
		break
		;;
	*)
		err_help "Invalid argument: $1"
		;;
	esac
done

if [ "$#" -eq 0 ]; then
	IFS='
'
	set -o noglob
	# shellcheck disable=2046
	set -- $(cat)
fi

if [ -z "$width" ]; then
	width=$(tput cols)
fi

ft=$(filetype "$1")

case "$ft" in
directory)
	if has onefetch && in_git_repo "$1" 2>/dev/null; then
		if [ "$width" -lt "80" ]; then
			version=$(
				(
					onefetch --version | sed 's/onefetch //'
					printf '2.16'
				) | sort -V | tail -n1
			)

			if [ "$version" = '2.16.0' ]; then
				args='--no-art'
			else
				args='--show-logo=never'
			fi
		fi

		cmd="onefetch --include-hidden $args"
	elif [ -f "$1/README.md" ]; then
		exec $SCRIPT "$1/README.md"
	else
		cmd="exa --tree --git-ignore --level=3 --icons"
	fi
	;;
markdown)
	had bat && cmd="bat --color always"
	;;
sourcehut)
	has hut && cmd="hut git show --repo"
	;;
github)
	has gh && cmd="gh repo view"
	;;
esac

if [ -z "$cmd" ]; then
	exit 1
fi

$cmd "$1" 2>/dev/null