#!/bin/bash

RC='\e[0m'
RED='\e[31m'
YELLOW='\e[33m'
GREEN='\e[32m'

command_exists () {
    command -v $1 >/dev/null 2>&1;
}

checkEnv() {
    ## Check for requirements.
    REQUIREMENTS='curl groups sudo'
    if ! command_exists ${REQUIREMENTS}; then
        echo -e "${RED}To run me, you need: ${REQUIREMENTS}${RC}"
        exit 1
    fi

    ## Check Package Handeler
    PACKAGEMANAGER='apt dnf pacman'
    for pgm in ${PACKAGEMANAGER}; do
        if command_exists ${pgm}; then
            PACKAGER=${pgm}
            echo -e "Using ${pgm}"
        fi
    done

    if [ -z "${PACKAGER}" ]; then
        echo -e "${RED}Can't find a supported package manager"
        exit 1
    fi


    ## Check if the current directory is writable.
    GITPATH="$(dirname "$(realpath "$0")")"
    if [[ ! -w ${GITPATH} ]]; then
        echo -e "${RED}Can't write to ${GITPATH}${RC}"
        exit 1
    fi

    ## Check SuperUser Group
    SUPERUSERGROUP='wheel sudo'
    for sug in ${SUPERUSERGROUP}; do
        if groups | grep ${sug}; then
            SUGROUP=${sug}
            echo -e "Super user group ${SUGROUP}"
        fi
    done

    ## Check if member of the sudo group.
    if ! groups | grep ${SUGROUP} >/dev/null; then
        echo -e "${RED}You need to be a member of the sudo group to run me!"
        exit 1
    fi
    
}

installDepend() {
    ## Check for dependencies.
    DEPENDENCIES='autojump bash bash-completion tar neovim'
    echo -e "${YELLOW}Installing dependencies...${RC}"
    if [[ $PACKAGER == "pacman" ]]; then
        if ! command_exists yay; then
            echo "Installing yay..."
            sudo ${PACKAGER} --noconfirm -S base-devel
            $(cd /opt && sudo git clone https://aur.archlinux.org/yay-git.git && sudo chown -R ${USER}:${USER} ./yay-git && cd yay-git && makepkg --noconfirm -si)
        else
            echo "Command yay already installed"
        fi
    	yay --noconfirm -S ${DEPENDENCIES}
    else 
    	sudo ${PACKAGER} install -yq ${DEPENDENCIES}
    fi
}

installStarship(){
    if command_exists starship; then
        echo "Starship already installed"
        return
    fi

    if ! curl -sS https://starship.rs/install.sh|sh;then
        echo -e "${RED}Something went wrong during starship install!${RC}"
        exit 1
    fi
}

linkConfig() {
    ## Check if a bashrc file is already there.
    OLD_BASHRC="${HOME}/.bashrc"
    if [[ -e ${OLD_BASHRC} ]]; then
        echo -e "${YELLOW}Moving old bash config file to ${HOME}/.bashrc.bak${RC}"
        if ! mv ${OLD_BASHRC} ${HOME}/.bashrc.bak; then
            echo -e "${RED}Can't move the old bash config file!${RC}"
            exit 1
        fi
    fi

    echo -e "${YELLOW}Linking new bash config file...${RC}"
    ## Make symbolic link.
    ln -svf ${GITPATH}/.bashrc ${HOME}/.bashrc
    ln -svf ${GITPATH}/starship.toml ${HOME}/.config/starship.toml
}

checkEnv
installDepend
installStarship
if linkConfig; then
    echo -e "${GREEN}Done!\nrestart your shell to see the changes.${RC}"
else
    echo -e "${RED}Something went wrong!${RC}"
fi