#!/bin/bash

################################################################################
#Copyright (C) 2013 Tony Grosinger. All rights reserved.
#
#Description:
# This script can be run in two modes depending on the file structure of the
# current working directory or the arguments passed to it.
#
# Mode 1: From within a cloned repository or downloaded snapshot with all files
#         already present and ready to be symlinked
#
# Mode 2: Standalone or through Curl in which case all required files will be
#         downloaded automatically to `~/.dotfiles` before creating symlinks.
#
################################################################################

DOTFILES_DIR="${HOME}/.dotfiles"
GIT_REPO_BASE="https://github.com/tgrosinger/dotfiles"
GIT_REPO="${GIT_REPO_BASE}.git"
REPO_TAR="${GIT_REPO_BASE}/archive/master.tar.gz"

################################################################################
# Define functions
################################################################################

# Remove a file if it exists then create a symlink to the one contained in ${REPO_DIR}
function linkFile() {
    ln -fns ${REPO_DIR}/$1 $1;
}

# Create a directory named by first parameter. Delete directory first if it already exists.
function createDirectory() {
    if [ -d $1 ]; then rm -rf $1; fi
    mkdir $1
}

# Perform the actual work of copying files and creating symlinks.
# Requires a home directory argument.
function performSetup() {
    if [ ${#} != 1 ]; then
        echo "Must pass home directory to ${FUNCNAME}"
        exit 1
    fi
    home=${1}

    echo "Moving to Home directory..."
    pushd ${home} > /dev/null

    if [ ! -d bin ]; then
        echo "Creating a bin directory..."
        mkdir bin
    fi

    if [ ! -d .config ]; then
        echo "Creating a .config directory..."
        mkdir .config
    fi

    echo "Linking shell configs..."
    linkFile ".bashrc"

    echo "Linking vim..."
    linkFile ".vim"
    linkFile ".vimrc"

    echo "Linking spacemacs..."
    echo "(note: you must install spacemacs separately)"
    linkFile ".spacemacs"

    echo "Linking Git..."
    linkFile ".gitconfig"

    echo "Linking tmux..."
    linkFile ".tmux.conf"

    echo "Linking inputrc..."
    linkFile ".inputrc"

    echo "Linking i3..."
    linkFile ".i3"
    linkFile ".i3status.conf"

    echo "Linking bin files"
    linkFile "bin/git-safedel"
    linkFile "bin/diff-highlight"
    linkFile "bin/exa-0.8.0"
    linkFile "bin/bat-0.10.0"

    echo "Installing tmux plugins"
    git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm

    popd > /dev/null
}

################################################################################
# Initialize (Determine mode)
################################################################################

# Determine which mode we are running in. (Is the file in the current directory?)
if [ -f install.sh ]; then
    echo "Running in Mode 1: Already cloned repository"
    REPO_DIR="$( cd "$( dirname "$0" )" && pwd )"

    echo "This will create symlinks and destroy any conflicting configs already in place.";
    read -p "Continue? [y/N] " choice

    # Perform the logic
    case "$choice" in
        Y|y|yes )
            performSetup ${HOME}
            echo "Done! Restart your shell to see changes"
        ;;
        * ) echo "Aborted!";;
    esac
else
    echo "Running in Mode 2: Direct from Curl"

    # Make sure git is installed. Exit if it isn't.
    if which git; then
        # Git is installed, clone the repository using read-only url
        if [ -d ${DOTFILES_DIR} ]; then
            if [ -d ${DOTFILES_DIR}/.git ]; then
                echo "Updating dotfiles repository in ${DOTFILES_DIR}"
                pushd ${DOTFILES_DIR} > /dev/null
                git pull > /dev/null
                popd > /dev/null
            else
                echo "Cloning dotfiles repository to ${DOTFILES_DIR}"
                rm -rf ${DOTFILES_DIR}
                git clone ${GIT_REPO} ${DOTFILES_DIR}
            fi
        else
            echo "Cloning dotfiles repository to ${DOTFILES_DIR}"
            git clone ${GIT_REPO} ${DOTFILES_DIR}
        fi
    else
        # Git is not installed, download the zip and extract
        if ! which wget; then
            echo "You must have either git or wget installed. Please install one before continuing."
            exit 1
        fi

        if [ -d ${DOTFILES_DIR} ]; then
            rm -rf ${DOTFILES_DIR}
        fi

        mkdir ${DOTFILES_DIR}
        curl -L ${REPO_TAR} | tar zx --strip 1 --directory ${DOTFILES_DIR}
    fi

    REPO_DIR="${DOTFILES_DIR}"
    performSetup ${HOME}
    echo "Done! Restart your shell to see changes"
fi