#!/bin/sh

set -eu

if [ "$#" -lt 1 ] || [ "$#" -gt 3 ]; then
    echo "usage: tmux-popup-attach SESSION [DIRECTORY]" >&2
    echo "       tmux-popup-attach --basename DIRECTORY SESSION_SUFFIX" >&2
    exit 2
fi

if [ "$1" = "--basename" ]; then
    if [ "$#" -ne 3 ]; then
        echo "usage: tmux-popup-attach --basename DIRECTORY SESSION_SUFFIX" >&2
        exit 2
    fi

    directory=$2
    session=$(basename "$directory")$3
else
    if [ "$#" -gt 2 ]; then
        echo "usage: tmux-popup-attach SESSION [DIRECTORY]" >&2
        exit 2
    fi

    session=$1
    directory=${2:-}
fi

if [ -n "${TMUX:-}" ]; then
    tmux switch-client -t "=$session" 2>/dev/null && exit 0
else
    tmux attach-session -t "=$session" 2>/dev/null && exit 0
fi

tmux list-sessions -F '#{session_name}:#{session_attached}' 2>/dev/null |
    while IFS=: read -r name attached; do
        case $name in
            T*)
                if [ "$attached" = 0 ]; then
                    echo "Killing $name"
                    tmux kill-session -t "=$name" || true
                fi
                ;;
        esac
    done

if [ -n "$directory" ]; then
    tmux new-session -d -s "$session" -c "$directory" 2>/dev/null || true
else
    tmux new-session -d -s "$session" 2>/dev/null || true
fi

if [ -n "${TMUX:-}" ]; then
    exec tmux -2 switch-client -t "=$session"
fi

exec tmux -2 attach-session -t "=$session"