#!/usr/bin/env bash
# This script will ask users about their prefrences 
# like disk, file system, timezone, keyboard layout,
# user name, password, etc.
# shellcheck disable=SC2207

SCRIPT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"

# set up a config file
CONFIG_FILE=$SCRIPT_DIR/setup.conf
# check if file exists
if [ ! -f "$CONFIG_FILE" ]; then
    # create file if not exists
    touch -f "$CONFIG_FILE"
fi

# set options in setup.conf
set_option() {
    # check if option exists
    if grep -Eq "^${1}.*" "$CONFIG_FILE"; then
        # delete option if exists
        sed -i -e "/^${1}.*/d" "$CONFIG_FILE" 
    fi
    # else add option
    echo "${1}=${2}" >> "$CONFIG_FILE" 
}
# Adding global functions and variables to use in this script

check_root() {
	if [[ "$(id -u)" != "0" ]]; then
		echo -ne "Error: This script has to be run under the 'root' user!"
        exit 1
	fi
}

elements_present() {
    # check if an element exists
	for e in "${@:2}"; do [[ "$e" == "$1" ]] && break; done
}

invalid_option() {
    # invalid option message
    echo -ne "Please select a valid option: \n"
}

set_password() {
    # password helper function
    # read password without echoing (-s)
    read -prs "Please enter password: " PASSWORD1 
    echo -ne "\n"
    read -prs "Please re-enter password: " PASSWORD2
    echo -ne "\n"
    if [ "$PASSWORD1" == "$PASSWORD2" ]; then
       set_option "$1" "$PASSWORD1"
    else
        echo -ne "Passwords do not match \n"
        return
    fi
}

# make a title 
title () {
    echo -ne "\n"
    echo -ne "------------------------------------------------------------------------\n"
    echo -ne "\t\t\t$1\n"
    echo -ne "------------------------------------------------------------------------\n"
}

# ask user for option
PROMPT="Please enter your option: "

logo () {
# This will be shown on every set as user is progressing
echo -ne "
-------------------------------------------------------------------------
 █████╗ ██████╗  ██████╗██╗  ██╗████████╗██╗████████╗██╗   ██╗███████╗
██╔══██╗██╔══██╗██╔════╝██║  ██║╚══██╔══╝██║╚══██╔══╝██║   ██║██╔════╝
███████║██████╔╝██║     ███████║   ██║   ██║   ██║   ██║   ██║███████╗
██╔══██║██╔══██╗██║     ██╔══██║   ██║   ██║   ██║   ██║   ██║╚════██║
██║  ██║██║  ██║╚██████╗██║  ██║   ██║   ██║   ██║   ╚██████╔╝███████║
╚═╝  ╚═╝╚═╝  ╚═╝ ╚═════╝╚═╝  ╚═╝   ╚═╝   ╚═╝   ╚═╝    ╚═════╝ ╚══════╝
------------------------------------------------------------------------
            Please select presetup settings for your system              
------------------------------------------------------------------------
"
}

filesystem () {
    # This function will handle file systems. At this movement we are handling only
    # btrfs and ext4. Others will be added in future.
    title "File System"
    FILESYS=("btrfs" "ext2" "ext3" "ext4" "f2fs" "jfs" "nilfs2" "ntfs" "reiserfs" "vfat" "xfs")
    PS3="$PROMPT"
    select OPT in "${FILESYS[@]}"; do
        if elements_present "$OPT" "${FILESYS[@]}"; then
            if [ "$OPT" == "btrfs" ]; then
                # used -a to get more than one argument
                echo -ne "Please enter your btrfs subvolume names separated by space\n"
                echo -ne "usualy they are @, @home, @root etc. Defaults are @, @home, @var, @tmp, @.snapshots \n"
                read -pr "or press enter to use defaults: " -a ARR
                if [[  "${ARR[*]}" -eq 0 ]]; then
                    set_option "BTRFS_SUBVOLUME" "(@ @home @var @tmp @.snapshots)"
                    break
                else
                    # An array is a list of values.
                    NAMES=()
                    for i in "${ARR[@]}"; do
                        # push values to array
                        NAMES+=("$i")
                    done
                    # set to config file
                    set_option "BTRFS_SUBVOLUMES" "(${NAMES[*]})"
                    break
                fi
            fi
            set_option "FS" "$OPT"
            break
        else
            invalid_option
            break
        fi
    done
}

timezone () {
    # Added this from arch wiki https://wiki.archlinux.org/title/System_time
    _TIMEZONE="$(curl --fail https://ipapi.co/timezone)"
    _ZONE=($(timedatectl list-timezones | sed 's/\/.*$//' | uniq))
    echo -ne "System detected your timezone to be '$_TIMEZONE'"
    echo -ne  "\n"
    read -pr "Is this correct? yes/no: " ANSWER
    case "$ANSWER" in
        y|Y|yes|Yes|YES)
            set_option TIMEZONE "$_TIMEZONE"
            ;;
        n|N|no|NO|No)
            title "Manually setting timezone"
            PS3="$PROMPT"
            echo -ne "Please select your zone: \n"
            select ZONE in "${_ZONE[@]}"; do
                if elements_present "$ZONE" "${_ZONE[@]}"; then
                    _SUBZONE=($(timedatectl list-timezones | grep "${ZONE}" | sed 's/^.*\///'))
                    PS3="$PROMPT"
                    echo -ne "Please select your subzone: \n"
                    select SUBZONE in "${_SUBZONE[@]}"; do
                        if elements_present "$SUBZONE" "${_SUBZONE[@]}"; then
                            set_option TIMEZONE "${ZONE}/${SUBZONE}"
                            break
                        else
                            invalid_option
                            break
                        fi
                    done
                    break
                else
                    invalid_option
                    break
                fi
            done
            ;;

        *) echo "Wrong option. Try again";timezone;;
    esac
}

keymap () {
    # These are default key maps as presented in official arch repo archinstall
    KEYMAPS=("by" "ca" "cf" "cz" "de" "dk" "es" "et" "fa" "fi" "fr" "gr" "hu" "il" "it" "lt" "lv" "mk" "nl" "no" "pl" "ro" "ru" "sg" "ua" "uk" "us")
    PS3="$PROMPT"
    select OPT in "${KEYMAPS[@]}"; do
        if elements_present "$OPT" "${KEYMAPS[@]}"; then
            set_option KEYMAP "$OPT"
            break
        else
            invalid_option
            keymap
        fi
    done
}

drivessd () {
    # confirm if ssd is present
    read -pr "Is this system using an SSD? yes/no: " _SSD
    case "$_SSD" in
        y|Y|yes|Yes|YES)
            set_option "SSD" 1
            set_option "MOUNTOPTION" "noatime,compress=zstd,ssd,commit=120"
            ;;
        n|N|no|NO|No)
            set_option "SSD" 0
            set_option "MOUNTOPTION" "noatime,compress=zstd,commit=120"
            ;;
        *) echo "Wrong option. Try again";drivessd;;
    esac
}

diskselection () {
    # selection for disk type
    # show disks present on system
    DISKLIST="$(lsblk -n --output TYPE,KNAME,SIZE | awk '$1=="disk"{print "/dev/"$2" - "$3}')" # show disks with /dev/ prefix and size
    PS3="$PROMPT"
    select _DISK in "${DISKLIST[@]}"; do
        if elements_present "$_DISK" "${DISKLIST[@]}"; then
            # remove size from string
            DISK=$(echo "$_DISK" | awk '{print $1}')
            set_option DISK "$DISK"
            break
        else
            invalid_option
            break
        fi
    done
}

userinfo () {
    read -pr "Please enter your username: " USERNAME
    set_option USERNAME "${USERNAME,,}" # convert to lower case as in issue #109 
    set_password "PASSWORD"
    read -pr "Please enter your hostname: " HOSTNAME
    set_option HOSTNAME "$HOSTNAME"
}

setlocale (){
    # set locale
    locale_list=($(grep UTF-8 /etc/locale.gen | sed 's/\..*$//' | sed '/@/d' | awk '{print $1}' | uniq | sed 's/#//g'))
    PS3="$PROMPT"
    select LOCALE in "${locale_list[@]}"; do
        if elements_present "$LOCALE" "${locale_list[@]}"; then
            set_option LOCALE "${LOCALE}.UTF-8 UTF-8"
            break
        else
            invalid_option
            break
        fi
    done
}
# More features in future
# language (){}

# Starting functions
clear
logo
userinfo
clear
logo
diskpart
clear
logo
filesystem
clear
logo
timezone
clear
logo
keymap