#!/usr/bin/env bash
#
# Arch Linux installation
#
# Bootable USB:
# - [Download](https://archlinux.org/download/) ISO and GPG files
# - Verify the ISO file: `$ pacman-key -v archlinux-<version>-x86_64.iso.sig`
# - Create a bootable USB with: `# dd if=archlinux*.iso of=/dev/sdX && sync`
#
# UEFI setup:
#
# - Set boot mode to UEFI, disable Legacy mode entirely.
# - Temporarily disable Secure Boot.
# - Make sure a strong UEFI administrator password is set.
# - Delete preloaded OEM keys for Secure Boot, allow custom ones.
# - Set SATA operation to AHCI mode.
#
# Run installation:
#
# - Connect to wifi via: `# iwctl station wlan0 connect WIFI-NETWORK`
# - Run: `# bash <(curl -sL https://link.rafe.li/dot)`
#
# WARNING: this script will destroy data on the selected disk.
#

set -uo pipefail
trap 's=$?; echo "$0: Error on line "$LINENO": $BASH_COMMAND"; exit $s' ERR

exec 1> >(tee "stdout.log")
exec 2> >(tee "stderr.log" >&2)

export SNAP_PAC_SKIP=y

# Dialog
BACKTITLE="Arch Linux installation"

get_input() {
    title="$1"
    description="$2"

    input=$(dialog --clear --stdout --backtitle "$BACKTITLE" --title "$title" --inputbox "$description" 0 0)
    echo "$input"
}

get_password() {
    title="$1"
    description="$2"
    while : ; do
        init_pass=$(dialog --clear --stdout --backtitle "$BACKTITLE" --title "$title" --passwordbox "$description" 0 0)
        : "${init_pass:?dialog --clear --stdout --backtitle "$BACKTITLE" --title "$title" --msgbox "Password cannot be empty.\nTry again." 0 0}"

        test_pass=$(dialog --clear --stdout --backtitle "$BACKTITLE" --title "$title" --passwordbox "$description again" 0 0)
        if [[ "$init_pass" != "$test_pass" ]]; then
            dialog --clear --stdout --backtitle "$BACKTITLE" --title "$title" --msgbox "Passwords did not match.\nTry again." 0 0
        else
            break
        fi
    done
    echo "$init_pass"
}

get_choice() {
    title="$1"
    description="$2"
    shift 2
    options=("$@")
    dialog --clear --stdout --backtitle "$BACKTITLE" --title "$title" --menu "$description" 0 0 0 "${options[@]}"
}


echo -e "\n### Checking UEFI boot mode"
if [ ! -f /sys/firmware/efi/fw_platform_size ]; then
    echo >&2 "You must boot in UEFI mode to continue"
    exit 2
fi

echo -e "\n### Ensure the system clock is accurate"
timedatectl set-ntp true
hwclock --systohc --utc

echo -e "\n### Setting keyboard layout to de-latin1"
loadkeys de-latin1

echo -e "\n### Installing additional tools"
pacman -Sy --noconfirm --needed git reflector terminus-font dialog wget

echo -e "\n### HiDPI screens"
noyes=("Yes" "The font is too small" "No" "The font size is just fine")
hidpi=$(get_choice "Font size" "Is your screen HiDPI?" "${noyes[@]}") || exit 1
clear
[[ "$hidpi" == "Yes" ]] && font="ter-132n" || font="ter-716n"
setfont "$font"

hostname=$(get_input "Hostname" "Enter hostname") || exit 1
clear
: "${hostname:?"hostname cannot be empty"}"

user=$(get_input "User" "Enter username") || exit 1
clear
: "${user:?"user cannot be empty"}"

password=$(get_password "User" "Enter password") || exit 1
clear
: "${password:?"password cannot be empty"}"

devicelist=$(lsblk -dplnx size -o name,size | grep -Ev "boot|rpmb|loop" | tac | tr '\n' ' ')
read -r -a devicelist <<< "$devicelist"

device=$(get_choice "Installation" "Select installation disk" "${devicelist[@]}") || exit 1

clear

echo -e "\n### Setting up fastest mirrors"
reflector --country 'Germany,France' --protocol https --sort rate --latest 5 --save /etc/pacman.d/mirrorlist

echo -e "\n### Setting up partitions"
umount -R /mnt 2> /dev/null || true
swapoff --all
cryptsetup close swap 2> /dev/null || true
cryptsetup luksClose luks 2> /dev/null || true

sgdisk --zap-all "${device}"
sgdisk --clear \
    --new=1:0:+550MiB --typecode=1:ef00 --change-name=1:EFI \
    --new=2:0:+8GiB   --typecode=2:8200 --change-name=2:cryptswap \
    --new=3:0:0       --typecode=3:8300 --change-name=3:cryptsystem \
    "${device}"
sleep 5

echo -e "\n### Formatting partitions"
# Boot partition
mkfs.fat -F 32 -n "EFI" /dev/disk/by-partlabel/EFI

# Swap partition
cryptsetup open --type plain --key-file /dev/urandom /dev/disk/by-partlabel/cryptswap swap
mkswap -L swap /dev/mapper/swap
swapon -L swap

# System partition
echo -n "${password}" | cryptsetup luksFormat --type luks2 --pbkdf argon2id "/dev/disk/by-partlabel/cryptsystem"
echo -n "${password}" | cryptsetup luksOpen --allow-discards --persistent "/dev/disk/by-partlabel/cryptsystem" system
mkfs.btrfs --force --label system /dev/mapper/system

echo -e "\n### Setting up BTRFS subvolumes"
o=defaults,x-mount.mkdir
o_btrfs=$o,compress=zstd,ssd,noatime

mount -t btrfs LABEL=system /mnt
btrfs subvolume create /mnt/root
btrfs subvolume create /mnt/home
btrfs subvolume create /mnt/snapshots
btrfs subvolume create /mnt/pkgs
btrfs subvolume create /mnt/aurbuild
btrfs subvolume create /mnt/archbuild
btrfs subvolume create /mnt/docker
btrfs subvolume create /mnt/logs
btrfs subvolume create /mnt/tmp
umount -R /mnt

mount -t btrfs -o subvol=root,$o_btrfs LABEL=system /mnt
mount -t btrfs -o subvol=home,$o_btrfs LABEL=system /mnt/home
mount -t btrfs -o subvol=snapshots,$o_btrfs LABEL=system /mnt/.snapshots
mount -t btrfs -o subvol=pkgs,$o_btrfs LABEL=system /mnt/var/cache/pacman
mount -t btrfs -o subvol=aurbuild,$o_btrfs LABEL=system /mnt/var/lib/aurbuild
mount -t btrfs -o subvol=archbuild,$o_btrfs LABEL=system /mnt/var/lib/archbuild
mount -t btrfs -o subvol=docker,$o_btrfs LABEL=system /mnt/var/lib/docker
mount -t btrfs -o subvol=logs,$o_btrfs LABEL=system /mnt/var/log
mount -t btrfs -o subvol=tmp,$o_btrfs LABEL=system /mnt/var/tmp

mount -o $o LABEL=EFI /mnt/efi

echo -e "\n### Configuring custom repo"
mkdir "/mnt/var/cache/pacman/${user}-local"

# if [[ "${user}" == "maximbaz" && "${hostname}" == "home-"* ]]; then
#     wget -m -nH -np -q --show-progress --progress=bar:force --reject='index.html*' --cut-dirs=2 -P "/mnt/var/cache/pacman/${user}-local" 'https://pkgbuild.com/~maximbaz/repo/'
#     rename -- 'maximbaz.' "${user}-local." "/mnt/var/cache/pacman/${user}-local"/*
# else
    repo-add "/mnt/var/cache/pacman/${user}-local/${user}-local.db.tar"
# fi

if ! grep "${user}" /etc/pacman.conf > /dev/null; then
    cat >> /etc/pacman.conf << EOF

[${user}-local]
Server = file:///mnt/var/cache/pacman/${user}-local

[maximbaz]
Server = https://pkgbuild.com/~maximbaz/repo/x86_64/

[options]
CacheDir = /mnt/var/cache/pacman/pkg
CacheDir = /mnt/var/cache/pacman/${user}-local
EOF
fi

echo -e "\n### Installing packages"
kernel_packages=(
    "linux"
    "linux-headers"
    "linux-lts"
    "linux-firmware"
    "intel-ucode"
)
fs_packages=(
    "btrfs-progs"
    "dosfstools"
    "e2fsprogs"
)
network_packages=(
    "iwd"
    "networkmanager"
)
basic_packages=(
    "man-db"
    "man-pages"
    "pacman-contrib"
    "neovim"
    "bash-completion"
    "git"
    "rsync"
    "openssh"
    "htop"
    "fzf"
    "sudo"
    #"pipewire"
    #"pipewire-pulse"
    #"pipewire-jack"
    #"wireplumber"
    #"firefox"
    #"firefox-i18n-de"
    #"firefox-ublock-origin"
    #"firefox-dark-reader"
    #"aurutils" # from maximbaz repo
    #"devtools" # tools for aurutils
    #"docbook-xls" # depenency of plymouth-git
    #"efitools" # provides KeyTool
    #"libfido2" # for systemd-cryptenroll
    #"bluez"
    #"bluez-utils"
    #"usbutils" # for lsusb
)
all_packages=(
	${kernel_packages[@]}
	${fs_packages[@]}
	${network_packages[@]}
	${basic_packages[@]}
)

pacstrap /mnt base base-devel arch-secure-boot chezmoi ${all_packages[@]}

echo -e "\n### Generating base config files"
genfstab -L -p /mnt >> /mnt/etc/fstab
sed -i "s+LABEL=swap+/dev/mapper/swap+" /mnt/etc/fstab
echo "cryptswap /dev/disk/by-partlabel/cryptswap /dev/urandom swap,cipher=aes-xts-plain64,size=256" >> /mnt/etc/crypttab

systemd-nspawn -bD /mnt

sed -i 's/^#en_US\.UTF-8/en_US\.UTF-8/' /etc/locale.gen
sed -i 's/^#de_DE\.UTF-8/de_DE\.UTF-8/' /etc/locale.gen
locale-gen

systemd-firstboot \
    --locale="en_US.UTF-8" \
    --keymap="de-latin1" \
    --timezone="Europe/Berlin" \
    --hostname="${hostname}" \
    --setup-machine-id
echo "FONT=$font" > /etc/vconsole.conf
echo -e "127.0.0.1\tlocalhost" >> /etc/hosts
echo -e "127.0.1.1\t$hostname" >> /etc/hosts
echo -e "\n::1\tlocalhost"     >> /etc/hosts
timedatectl set-ntp 1

echo -e "\n### Creating user"
useradd -m "$user"
for group in wheel network video audio input storage power; do
    groupadd -rf "$group"
    gpasswd -a "$user" "$group"
done
echo "$user:$password" | chpasswd

echo -e "\n### Disabling root login"
passwd -dl root

echo -e "\n### Setting permissions on the custom repo"
chown -R "$user:$user" "/var/cache/pacman/${user}-local/"

#echo -e "\n### Cloning dotfiles and running initial setup"
#sudo -u $user sh -c 'chezmoi init --apply https://code.strobeto.de/strobeltobias/dotfiles.git && chezmoi state delete-bucket --bucket=scriptState'

cat > /etc/NetworkManager/conf.d/wifi_backend.conf <<EOF
[device]
wifi.backend=iwd
EOF
systemctl enable NetworkManager.service
poweroff #exit nspawned environment
echo -e "\n### DONE - reboot and re-run 'chezmoi apply' to complete system setup"