#!/bin/bash
## brethil's dotfiles installation script
## 20 June 2016

# Get the location for the dotfiles
DOTFILES=$PWD

PACKAGES="vim zsh antibody git grc ccze bmon mtr tmux byobu htop"

function setup_git {
    # set up some git stuff
    git config --global include.path $DOTFILES/gitconfig
}

function install_vimrc {
    # TODO: check if vim-plug is installed
    if [ -f "$HOME/.vimrc" ]; then
		mv "$HOME/.vimrc"{,.bak} && echo "Backed up old vimrc"
    fi
    ln -s "$DOTFILES/.vimrc" "$HOME/.vimrc"
}

function setup_ackrc {
    ln -s "$DOTFILES/ackrc" "$HOME/.ackrc"
}

function setup_ipython {
    python -m pip install pip ipython || python -m pip install --user pip ipython
    ipython -c "1+1" # run ipython once so that we are sure that the profile directories exist
    ln -s "$DOTFILES/ipython/profile_default/ipython_config.py" "$HOME/.ipython/profile_default/"
    ln -s "$DOTFILES/ipython/profile_default/startup" "$HOME/.ipython/profile_default/startup"
}

# Add an ssh config file with:
# - Connection multiplexer for faster multiple connections
# - Keep connections alive (avoid timeout disconnections)
function create_ssh_config {
    echo "# Configuring ssh..."

    ssh_config="$HOME/.ssh/config"

    if [ ! -f $HOME/.ssh/id_rsa ]; then
        echo "Creating ssh key (4096bit)..."

        echo "Enter ssh-key comment (leave empty for default: user@host)"
        read comment
        if [[ $comment ]]; then
            ssh-keygen -t ed25519 -C "$comment"
        else
            ssh-keygen -t ed25519
        fi
        # fix permissions
        chmod 0700 "$HOME/.ssh"
    fi

    if [[ -f $ssh_config ]]; then
        until [[ $modifyssh == "y" || $modifyssh == "n" ]]; do
            echo "Do you want to modify the existing ssh config? (New values will be appended) (y/n)"
            read modifyssh
        done
    fi

    exec 3>&1 # save stdout file descriptor

	# add the ssh rc that symlinks the used SSH_AUTH_SOCK. This will be executed on every ssh login.
	# The idea is that if the user is logging in using ssh -A, the symlink will point to the correct
	# location of the ssh auth socket and the remote ssh agent will be used.
    # SSH_AUTH_SOCK is declared in brethil_dotfile.sh
    exec 1>>~/.ssh/rc
	echo '#!/bin/bash'
	echo 'if test "$SSH_AUTH_SOCK" ; then'
    echo '	ln -sf $SSH_AUTH_SOCK ~/.ssh/ssh_auth_sock'
	echo 'fi   '
	chmod 755 ~/.ssh/rc

    exec 1>>$ssh_config # redirect everything below to the $ssh_config file
    if [[ "$modifyssh" == "n" ]]; then
        echo "Did not modify $ssh_config."
        exec 1>&3 # restore stdout
        return
    fi
    echo "# brethil's dotfiles setup start"
    echo 'TCPKeepAlive=yes'
    echo 'ServerAliveCountMax=6'
    echo
    echo "## Uncomment to enable compression for all ssh sessions"
    echo '#Compression=yes'
    echo
    echo '## Uncomment the following to enable ssh ControlMaster and ssh session persistence'
    echo '#ControlMaster autoask # ask for confirmation before using a shared connection'
    echo '#ControlMaster auto # do not ask for confirmation'
    echo '#ControlPath ~/.ssh/%r@%h:%p'
    echo '#ControlPersist yes'
    echo
    echo 'Host *'
    echo '    ServerAliveInterval 300'
    echo
    echo '## Enable the following if you want to use the rmate textmate remote'
    echo "#Host *"
    echo "#    RemoteForward 52698 localhost:52698"
    echo
    echo '## Enable the following if you want to use a reverse ssh tunnel to use mecp command on remote hosts'
    echo "#Host *"
    echo "#    Remoteforward 2222 localhost:22"
    echo
    echo '# end of brethil dotfiles setup #'

    exec 1>&3 # restore stdout
    echo ".ssh/ssh_config configured. Edit it to enable custom options:"
    echo "- Compression"
    echo "- Remote forwarding  remote:2222->localhost:22 (revere tunnel to scp back to the original host using mecp)"
    echo "# End of ssh config."
}

function fix_annoyances {
    ## Fix scrolling in byobu
    if [[ $(uname) == "Darwin" ]]; then
        sed -i '' 's/set -g terminal-overrides/#set -g terminal-overrides/' /usr/share/byobu/profiles/tmux
    else
        sed -i 's/set -g terminal-overrides/#set -g terminal-overrides/' /usr/share/byobu/profiles/tmux
    fi

    # remove ls from the grc.zsh config: # TODO: fix this on MacOS
    sed 's|ls \\|#ls \\|' /etc/grc.zsh

    # TODO: add iptables, docker to grc.zsh
}


# First setup
function brethil_dotfiles_setup {
    antibody &>/dev/null || (echo "Please install antibody then continue." 1>&2 && echo "Other useful packages: $PACKAGES" && exit)
    bin="$HOME/bin"
    projects="$HOME/projects"
    git="$HOME/git"
    mkdir -p "$bin" "$projects" "$git" && echo "Created dirs $bin, $projects, $git"

    # prepare .zshrc
    cp "$HOME/.zshrc"{,.pre-brethil-dotfiles}
    exec 3>&1 # save stdout
    exec 1>>"$HOME/.zshrc"
    echo -e "\n\n# brethil's dotfiles:"
    echo "export DOTFILES=$DOTFILES"
    echo "source \$DOTFILES/brethil_dotfile.sh"
    echo -e "# End of brethil's dotfiles\n\n"
    exec 1>&3 # restore stdout

    antibody bundle "$DOTFILES/antibody_plugins.txt"
    antibody update

    fix_annoyances
    setup_vim
    # Create ssh config
    create_ssh_config
    # git config
    setup_git
    # ipython profile
    setup_ipython
    # pdbpp rc
    setup_pdbprc
    # ackrc
    setup_ackrc

    ZSH="$(antibody path robbyrussell/oh-my-zsh)"
    ln -s "$DOTFILES/brethil.zsh-theme" "${ZSH}/themes/" # TODO: improve this
    ln -s "$DOTFILES/brethil-minimal.zsh-theme" "${ZSH}/themes/"
}


function main(){
	set -e
	set -o pipefail
	# Setup
	# brethil_dotfiles_setup
	source "$DOTFILES/colors.sh"

	echo -e "$BOLD$GREEN Install complete!"
	echo ""
	echo "$WHITE Set \$DOTFILES to $DOTFILES"
	echo -e "$RED Functions definitions:$WHITE \$DOTFILES/functions.sh\n\tyou can add your own functions in ~/.dotfiles_functions"
	echo -e "$RED Aliases definitions:$WHITE \$DOTFILES/aliases.sh\n\tyou can add your own aliases in ~/.dotfiles_aliases)"
	echo -e "$RED Colors definitions:$WHITE \$DOTFILES/colors.sh"
	echo -e "$CLEAR"
	echo "More zsh plugins can be added using antibody, adding them at \$DOTFILES/antibody_plugins.txt"

	echo "Type '. ~/.zshrc' or 'exec zsh -l' to source the new configuration."
}

main