#!/bin/bash

#######################################################################
# Default settings
#######################################################################
# Use git by default
BUNDLE_TRANSPORT="git"

#######################################################################
# Helper functions
#######################################################################

# Make a folder (throw errors if it's already there but not a folder)
mkfolder()
{
    if [[ -e $1 ]]
    then
        if [[ ! -d $1 ]]
        then
            echo "$1 is not a directory!"
            echo "Backing up $1 to $1.bak"
            mv -v $1 $1.bak

            mkdir -p $1
        fi
    else
        mkdir -p $1
    fi
}

# Symlink file to destination folder
lnfile()
{
    # See if we are linking to a directory
    if [[ $2 =~ /$ ]]
    then
        FILE_PATH=$2
        FILE_NAME=$(basename $1)
        DST_FILE="${FILE_PATH}${FILE_NAME}"
    else
        FILE_PATH=$(dirname $2)
        FILE_NAME=$(basename $2)
        DST_FILE="$FILE_PATH/$FILE_NAME"
    fi
    SRC_FILE="$DF_PATH/$1"
    WRITE_LINK=0

    # See if the target exists
    if [[ -e $DST_FILE ]]
    then
        # Is the target a symbolic link?
        if [[ -L $DST_FILE ]]
        then
            POINTS_TO=$(readlink $DST_FILE)
            # Does it point to our file?
            if [[ "$POINTS_TO" != "$SRC_FILE" ]]
            then
                echo "Target $DST_FILE points to a different file - $POINTS_TO"
                echo -n "Replace link to point to $SRC_FILE? [y/n] "
                read -n1
                echo

                if [[ $REPLY == y || $REPLY == Y ]]
                then
                    WRITE_LINK=1
                    # Remove the old symbolic link
                    rm -f $DST_FILE
                fi
            #else
                # It already points to our file. No point in rewriting it.
            fi
        else
            # No, it's not a symbolic link
            echo "Target $DST_FILE is not a symbolic link!"
            echo "Backing up to $DST_FILE.bak"
            mv -v $DST_FILE ${DST_FILE}.bak
            WRITE_LINK=1
        fi
    else
        WRITE_LINK=1
    fi

    if [[ ! -z $DEBUG ]]
    then
        echo -n "Linking "
        [[ ! -z $WRITE_LINK ]] && echo -n "(NOT) "
        echo "'$DST_FILE' -> '$SRC_FILE'"
    fi

    if [[ $WRITE_LINK == 1 ]]
    then
        echo "Installing $1"
        ln -sf "$SRC_FILE" "$DST_FILE"
    fi
}

#######################################################################
# Verify command line switches
#######################################################################
while getopts "h" OPTION
do
    case "$OPTION" in
        h)
            echo '
This script installs the dotfiles into various locations using symbolic
links.

Options:
--------
    -h              Displays this help message
'
            exit 0
            ;;

        \?)
            exit 1
            break
            ;;
    esac
done

#######################################################################
# Install dotfiles
#######################################################################

# Install scripts/config files to corresponding destination folders
cd $(dirname $0)
DF_PATH=$(pwd)
PRINT_PATH=$(echo $DF_PATH | sed "s:^$HOME:~:")
echo Installing dotfiles from $PRINT_PATH

#######################################################################
# Initialize submodules
#######################################################################
git submodule init
git submodule update

#######################################################################
# Install scripts
#######################################################################

# Create ~/bin folder
mkfolder ~/bin

# Install scripts
lnfile scripts/beep ~/bin/
lnfile scripts/deploy ~/bin/
lnfile scripts/mlog ~/bin/
lnfile scripts/stardate ~/bin/
lnfile scripts/settitle ~/bin/
lnfile scripts/smartwd ~/bin/

# Don't bother installing the note script on a Mac, it doesn't work that well
if [[ "$(uname)" != *"Darwin"* ]]
then
    lnfile scripts/note ~/bin/
    lnfile scripts/note ~/bin/n
fi

#######################################################################
# Install git configuration
#######################################################################
if [[ ! -e ~/.gitconfig ]]
then
    echo "Installing gitconfig"
    cp -v gitconfig ~/.gitconfig
    echo -n "What is your default Git username? "
    read $GIT_USER
    echo -n "What is your default Git e-mail address? "
    read $GIT_EMAIL
    git config --global user.name $GIT_USER
    git config --global user.email $GIT_EMAIL
fi

# Install git prompt functions
if [[ ! -e ~/.git_prompt.sh ]]
then
    echo "Installing Git prompt functionality..."
    curl -Sso ~/.git_prompt.sh \
    https://raw.githubusercontent.com/git/git/master/contrib/completion/git-prompt.sh
fi

#######################################################################
# Install vimrc & plugins
#######################################################################

# Create VIM folders
mkfolder ~/.vim

# Update the Git repository at ~/.vim, if it exists, clone otherwise
pushd ~/.vim &>/dev/null
if [[ -d .git ]]
then
    git pull
else
    git clone git@github.com:nirenjan/vimfiles.git .
fi

git submodule init
git submodule update

popd &>/dev/null

# Install the basic vimrc file from this repo
lnfile vimrc ~/.vimrc

#######################################################################
# Install tmux & screen config files
#######################################################################

# Install tmux configuration file
lnfile tmux.conf ~/.tmux.conf

# Install screen configuration file
lnfile screenrc ~/.screenrc

#######################################################################
# Install bashrc files
#######################################################################
if [[ -L ~/.bashrc.common ]]
then
    PRINT_INST=0
else
    PRINT_INST=1
fi

lnfile bash/bashrc.common ~/.bashrc.common
lnfile bash/bashrc.lscolors ~/.bashrc.lscolors
lnfile bash/bashrc.aliases ~/.bashrc.aliases
lnfile dircolors ~/.dir_colors

if [[ $PRINT_INST == 1 ]]
then
    echo "Add the following line to your ~/.bashrc file"
    echo "    source ~/.bashrc.common"
fi