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

# Get the location for the dotfiles
DOTFILES=$PWD

ZSHTMP="$HOME/.zshrctmp"
echo -e "\n\n# brethil's dotfiles:" >> $ZSHTMP
echo "DOTFILES=$DOTFILES" >> $ZSHTMP
echo "source \$DOTFILES/brethil_dotfile.sh" >> $ZSHTMP
echo -e "# End of brethil's dotfiles\n\n"

function setup_git {
    # set up some git stuff
    git config --global pull.ff only
    git config --global merge.ff only
}

function install_rmate {
    # Install python version of the textmate rmate remote (from github)
    if [[ $(whoami) == "root" ]]; then
        destpath="/usr/bin"
    else
        destpath="$HOME/bin"
    fi
    if [[ -f $destpath/rmate ]]; then
        echo "rmate already exists: not installed"
        return 1
    else
        curl -sL https://raw.githubusercontent.com/sclukey/rmate-python/master/bin/rmate > $destpath/rmate
        chmod a+x $destpath/rmate
        ln -s $destpath/rmate $destpath/mate || "Could not create symbolic link to $destpath/mate (already exists?)"
        echo "Installed rmate (and mate symlink) in $destpath"
        return 0
    fi
}

function install_vimrc {
    # Install vimrc from github.com/amix/vimrc
    git clone "https://github.com/amix/vimrc.git" "$HOME/.vim_runtime" && sh "$HOME/.vim_runtime/install_awesome_vimrc.sh" || return 1
}


function install_zsh_plugins {
    # Install fast-syntax-highlighting (git: zdharma), zsh-autosuggestions (git:zsh-users), alias-tips
    ZSH_PLUGINS="$HOME/.oh-my-zsh/custom/plugins"
    mkdir -p "$ZSH_PLUGINS"
    # NOTE: if adding plugins here, be sure to also add them to the _dotfiles_upgrade function in check_for_upgrade.sh
    git clone https://github.com/zdharma/fast-syntax-highlighting.git "${ZSH_PLUGINS}/fast-syntax-highlighting" || error=true
    git clone https://github.com/zsh-users/zsh-autosuggestions "${ZSH_PLUGINS}/zsh-autosuggestions" || error=true
    git clone https://github.com/djui/alias-tips.git "${ZSH_PLUGINS}/alias-tips" || error=true
    if [[ $error ]]; then
        return 1
    else
        return 0
    fi
}

# 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 rsa -b 4096 -C $comment
        else
            ssh-keygen -t rsa -b 4096
        fi
        # fix permissions
        chmod 0700 "$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 "# 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 auto'
        echo '#ControlPath /tmp/%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 port 52698->52698 (Textmate rmate remote)"
        echo "- Remote forwarding  remote:2222->localhost:22 (mecp)"
    else
        echo "Did not modify $ssh_config."
    fi
    echo "# End of ssh config."
}

# First setup
function brethil_dotfiles_setup {
    bin="$HOME/bin"
    projects="$HOME/projects"
    git="$HOME/git"
    mkdir -p "$bin" "$projects" "$git" && echo "Created dirs $bin, $projects, $git"

    # Install packages
    # zsh
    # grc: generic colourizer, colors output of any command
    # ccze: similar to the above
    # byobu: configuration/wrapper for tmux
    # bmon: bandwidth monitor, monitors bandwith usage, shows graph
    # mtr: mytraceroute, traceroute tool
    # pv: pipe view, monitor the progress of data through a pipe
    # byobu: tmux wrapper
    # htop:  like top, but bettah
    packages="zsh git grc ccze bmon mtr pv tmux byobu htop"

    # Check if running as root, if try using sudo to install packages.
    # If sudo is not installed, launch a shell to try and install it
    if [[ $(id -u) != 0 ]]; then
        if [[ ! -f $(which sudo) ]] ; then
            unset yn
            until [[ $yn == "y" || $yn == "n" ]]; do
                echo "Cannot install new packages without root access. Do you want to try to manually install sudo? (yn) "
                read yn
            done
            if [[ $yn == "y" ]]; then
                echo "Launching an interactive shell. Type exit after installing sudo."
                # Launch bash
                $(which bash)
            else
                echo "Quitting."
                exit 0
            fi
        elif [[ -f $(which sudo) ]]; then
            sudo="sudo "
        fi
    fi

    if [[ $(which apt-get ) ]]; then
        install_command="${sudo}apt-get install"
    elif [[ $(which pacman) ]]; then
        pacman -Sy yay # also install the yay aur package managery
        packages="$packages"
        install_command="${sudo}yay -Sy"
    elif [[ $(which yum) ]]; then
        install_command="${sudo}yum"
    elif [[ $(which port) ]]; then
        install_command="${sudo}port install"
    elif [[ $(which brew) ]]; then
        install_command="${sudo}brew install"
    else
        echo "I do not know how to install the required packages. Quitting."
        exit 0
    fi

    # actually install the packages:
    $install_command $packages

    # Install oh-my-zsh
    echo "Installing oh-my-zsh..."
    sh -c "$(curl -sL zsh.dioporc.one | sed 's/env zsh/#env zsh/')" # comment the part that launches zsh

    # oh-my-zsh's zshrc has been installed, prepend the dotfiles setup to it
    cat "$HOME/.zshrc" >> $ZSHTMP
    mv $ZSHTMP $HOME/.zshrc

    # Increase history size
    echo "export HISTSIZE=100000" >> $HOME/.zshrc

    ## 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:
    sed 's|ls \\|#ls \\|' /etc/grc.zsh

    # Set m and M to enable/disable mouse mode in tmux/byobu
    echo 'bind-key m source $BYOBU_PREFIX/share/byobu/keybindings/mouse.tmux.enable \; display-message "Mouse: ON"' >> ~/.tmux.conf
    echo 'bind-key M source $BYOBU_PREFIX/share/byobu/keybindings/mouse.tmux.disable \; display-message "Mouse: Off"' >> ~/.tmux.conf

    ## Install the rmate client for textmate
    #install_rmate && echo "Installed rmate Textmate remote "|| echo "Failed to install rmate Textmate remote"

    # Install vim awesomerc (git amix/vimrc)
    install_vimrc && echo "Installed vim awesome rc" || echo "Failed to install vim awesome rc"
    # Create ssh config
    create_ssh_config
    # git config
    setup_git

    # Install new zsh plugins in $ZSH/custom/plugins/
    install_zsh_plugins && echo "Installed custom zsh plugins in $ZSH/custom/plugins/" || echo "Failed to install custom zsh plugins"

    # Source the plugins defined in brethil_dotfile.sh ($plugins)
    if [[ $(uname) == "Darwin" ]]; then
        sed -i "" -e 's/plugins=.*/plugins=\( $plugins \)/' $HOME/.zshrc
    else
        sed -i -e 's/plugins=.*/plugins=\( $plugins \)/'  $HOME/.zshrc
    fi

    # Symlink brethil.zsh-theme
    ln -s $DOTFILES/brethil.zsh-theme $HOME/.oh-my-zsh/custom/
    # Symlink brethil-minimal.zsh-theme
    ln -s $DOTFILES/brethil-minimal.zsh-theme $HOME/.oh-my-zsh/custom/

    # Set brethil theme
    if [[ $(uname) == "Darwin" ]]; then # MacOS has a different syntax for sed
        sed -i '' 's/ZSH_THEME=".*"/ZSH_THEME="brethil"/' $HOME/.zshrc
    else
        sed -i 's/ZSH_THEME=".*"/ZSH_THEME="brethil"/' $HOME/.zshrc
    fi

    #TODO: replace brethil theme with powerline?
}



# Setup
brethil_dotfiles_setup

echo "Functions definitions in $DOTFILES/functions.sh (you can add your own functions in ~/.dotfiles_functions)"
echo "Aliases definitions in $DOTFILES/aliases.sh (you can add your own aliases in ~/.dotfiles_aliases)"
echo "Colors are defined in $DOTFILES/colors.sh"

echo "Type . ~/.zshrc to source the new dotfiles, or simply launch another shell. )"