#!/bin/sh

HOST=$(tmux display -p '#h' 2>/dev/null)

if [ -n "$SSH_CLIENT" ] || [ -n "$SSH_TTY" ]; then
	tmux -L ssh run-shell "tmux-ssh"
	exit 0
fi

if [ "$#" -eq 0 ]; then
	ATTACHED=$(tmux display -p '#{?#{m:*ssh,#{socket_path}},#S,#{host}}' 2>/dev/null)

	set -- "$(
		sshr --all --exclude="$ATTACHED" |
			fzf-tmux -p20%,20% -- --print-query --tac |
			tail -1
	)"
fi

if [ -z "$1" ]; then
	exit 0
fi

target="$1"

if [ "$target" = "$HOST" ]; then
	tmux detach -E 'tmux new -A'
else
	if ! tmux -L ssh has-session -t "$target"; then
		local_socket=$(tmux -L ssh start-server \; display -p "#{socket_path}")
		remote_socket=$(
			ssh -T \
				-o "ControlMaster=auto" \
				-o "ControlPath=${XDG_RUNTIME_DIR}/ssh.%C" \
				"$target" 'tmux -L ssh start-server \; display -p "#{socket_path}"'
		)

		tmux -L ssh new-session -ds "$target" \
			ssh -t \
			-o "ControlMaster=auto" \
			-o "ControlPath=${XDG_RUNTIME_DIR}/ssh.%C" \
			-R "$local_socket":"$remote_socket" \
			"$target" "zsh -l -c 'tmux new -A'"
	fi

	if [ -z "$TMUX" ]; then
		tmux -L ssh attach -t "$target"
	else
		tmux detach -E "tmux -L ssh attach -t $target"
	fi

	exit 0
fi