#!/usr/bin/env bash

default_session='quak'
dummy_session='dummy'
temp_window='temp'

function check_remote {
    if [[ -z "$1" ]]; then
        notify-send "[dmux]" "SCRIPT ERROR!"
        return 1
    fi

    if [[ -n "$(git fetch --all)" ]]; then
        notify-send "[$1]" "update available"
    fi
}

function create_default_session {
    if [[ -n "$TMUX" ]]; then
        echo "already attached to a session. don't nest tmux sessions"
        # return failure so the external attach command is not run
        return 1
    fi

    # check if the default session exists
    # redirect stderr to /dev/null because `session not found` is
    # not a relevant error in this case
    if $(tmux has-session -t ${default_session} 2>/dev/null); then
        # return success so the external attach command is run
        return 0
    fi

    # check repository paths
    if [[ -d "${HOME}/repositories" ]]; then
        path_repositories="${HOME}/repositories"
    fi
    if [[ -d "${HOME}/dotfiles" ]]; then
        path_dotfiles="${HOME}/dotfiles"
    elif [[ -n "${path_repositories}" ]] && [[ -d "${path_repositories}/dotfiles" ]]; then
        path_dotfiles="${path_repositories}/dotfiles"
    fi
    if [[ -d "${HOME}/collection" ]]; then
        path_documentation="${HOME}/collection"
    elif [[ -n "${path_repositories}" ]] && [[ -d "${path_repositories}/collection" ]]; then
        path_documentation="${path_repositories}/collection"
    fi

    # start dummy session to avoid error messages on `has-session`
    tmux new-session -d -s "${dummy_session}"

    # dont forget the '-d' option, otherwise the session is closed
    # before the rest of the commands are executed
    tmux new-session -d -s "${default_session}" -n "${temp_window}" -c "${HOME}" # create dummy window to set default path for new windows

    # open window for config and check git status
    if [[ -n "${path_dotfiles}" ]]; then
        tmux new-window -t "${default_session}" -n "dotfiles" -c "${path_dotfiles}"
        tmux select-window -t "${default_session}:dotfiles"
        check_remote "dotfiles"
    fi

    if [[ -n "${path_documentation}" ]]; then
        tmux new-window -t "${default_session}" -n "docs" -c "${path_documentation}"
        tmux select-window -t "${default_session}:docs"
        check_remote "collection"
    fi

    tmux new-window -t "${default_session}" -n "stuff" -c "${HOME}"
    tmux select-window -t "${default_session}:stuff"

    tmux kill-window -t "${temp_window}"

    ## NOTE: this causes the script to exit only, when the session is ended
    ## or detached.
    ## it also causes tmux's detach command with hang up signal to fail,
    ## therefore the following line is commented out and an `alias` is
    ## created in `.bashrc`, which runs this script and `tmux attach`
    #tmux attach -t "${DEFAULT_SESSION}"

    tmux kill-session -t "${dummy_session}"
}

create_default_session