#!/bin/bash
#
## Wizard Kit: Live Linux Build Tool

# Prep
ROOT_DIR="$(realpath $(dirname "$0"))"
BUILD_DIR="$ROOT_DIR/BUILD_LINUX"
ARCHLIVE_DIR="$BUILD_DIR/Archlive"
AUR_PACKAGES="$ROOT_DIR/.linux_items/AUR-Packages"
CUSTOM_REPO_DIR="$BUILD_DIR/CustomRepo"
DATE="$(date +%F)"
DATETIME="$(date +%F_%H%M)"
LOG_DIR="$BUILD_DIR/Logs"
OUT_DIR="$ROOT_DIR/OUT_LINUX"
TMP_DIR="$BUILD_DIR/Temp"
if which nano >/dev/null 2>&1; then
    EDITOR=nano
elif which vim >/dev/null 2>&1; then
    EDITOR=vim
else
    EDITOR=vi
fi
if which sudo >/dev/null 2>&1; then
    REAL_USER="$SUDO_USER"
fi

function ask() {
    while :; do
        read -p "$1 " -r answer
        if echo "$answer" | egrep -iq '^(y|yes|sure)$'; then
            return 0
        elif echo "$answer" | egrep -iq '^(n|no|nope)$'; then
            return 1
        fi
    done
}
        
function cleanup() {
    for d in "$TMP_DIR" "$ARCHLIVE_DIR"; do
        if [[ -d "$d" ]]; then
            if ask "Remove: ${d}?"; then
                rm -Rf "$d"
            fi
        fi
    done
    mkdir "$BUILD_DIR" 2>/dev/null
    mkdir "$LOG_DIR" 2>/dev/null
    mkdir "$OUT_DIR" 2>/dev/null
    mkdir "$TMP_DIR" 2>/dev/null
}

function copy_archiso() {
    echo "Copying Archlinux files..."
    rsync -a /usr/share/archiso/configs/releng/ "$ARCHLIVE_DIR/"
    
    # Update build.sh
    if ! grep -iq 'customize_iso' archlive/build.sh; then
        sed -ir 's!run_once make_iso!# customize_iso\ncp -a ${script_path}/extra/* ${work_dir}/iso/\n\nrun_once make_iso!' archlive/build.sh
    fi
}

function copy_settings() {
    if [[ ! -e "$BUILD_DIR/MAIN_SETTINGS" ]] || ask "Overwrite MAIN_SETTINGS?"; then
        cp -bv "$ROOT_DIR/.bin/Scripts/settings/main.py" "$BUILD_DIR/MAIN_SETTINGS"
    fi

    # Edit settings
    read -p "Press Enter to open settings... " -r
    "$EDITOR" "$BUILD_DIR/MAIN_SETTINGS"

    # Load settings
    while read line; do
        if echo "$line" | egrep -q "^\w+='"; then
            line="$(echo "$line" | sed -r 's/[\r\n]+//')"
            eval "$line"
        fi
    done < "$BUILD_DIR/MAIN_SETTINGS"
}

function run_elevated() {
    prog="$1"
    shift
    if which sudo >/dev/null 2>&1; then
        sudo "$prog" $*
    else
        echo -n "Root "
        su -c "export REAL_USER=$USER && '$prog' $*"
    fi
}

function update_repo() {
    if [[ "$EUID" -eq 0 ]]; then
        echo "This section not meant to be run as root."
        echo "Aborted."
        exit 1
    fi
    echo "Updating custom repo..."

    # Archive current files
    if [[ -d "$CUSTOM_REPO_DIR" ]]; then
        mkdir "$BUILD_DIR/Archive" 2>/dev/null
        archive="$BUILD_DIR/Archive/$(date "+%F_%H%M%S")"
        mv -bv "$CUSTOM_REPO_DIR" "$archive"
    fi
    sleep 1s

    # Build custom repo packages
    mkdir "$CUSTOM_REPO_DIR" 2>/dev/null
    mkdir "$TMP_DIR" 2>/dev/null
    pushd "$TMP_DIR" >/dev/null
    for p in $(cat "$AUR_PACKAGES"); do
        echo "Building: $p"
        curl -LsfO https://aur.archlinux.org/cgit/aur.git/snapshot/$p.tar.gz
        tar xf $p.tar.gz
        pushd $p >/dev/null
        makepkg -s --noconfirm
        popd >/dev/null
        mv -n $p/*xz "$CUSTOM_REPO_DIR"/
    done
    popd >/dev/null

    # Build custom repo database
    pushd "$CUSTOM_REPO_DIR" >/dev/null
    repo-add custom.db.tar.gz *xz
    popd >/dev/null
}

function install_deps() {
    echo "Installing dependancies..."
    run_elevated pacman -Syu --needed --noconfirm archiso attr base-devel curl libewf progsreiserfs rsync
}

function build_arch() {
    if [[ "$EUID" -ne 0 ]]; then
        echo "This section is meant to be run as root."
        echo "Aborted."
        exit 1
    fi
    
    # Set permissions
    echo "Setting permissions..."
    chown root:root "$ARCHLIVE_DIR" -R
    chmod 700 "$ARCHLIVE_DIR/airootfs/etc/skel/.ssh"
    chmod 600 "$ARCHLIVE_DIR/airootfs/etc/skel/.ssh/id_rsa"
    
    # Build ISO
    prefix="$(echo "${KIT_NAME_SHORT}-linux" | tr "[:upper:]" "[:lower:]")"
    label="${KIT_NAME_SHORT}_LINUX"
    "$ARCHLIVE/bulid.sh" -N "$prefix" -V "$DATE" -L "$label" -s "$TMP_DIR/Arch" -o "$OUT_DIR" -v | tee -a "$LOG_DIR/$DATETIME.log"

    # Cleanup
    echo "Removing temp files..."
    rm "$TMP_DIR/Arch" -Rf | tee -a "$LOG_DIR/$DATETIME.log"

    echo "Reverting permissions..."
    chown $REAL_USER:$REAL_USER "$ARCHLIVE_DIR" -R
}

function build_full() {
    if [[ "$EUID" -eq 0 ]]; then
        echo "This section not meant to be run as root."
        echo "Aborted."
        exit 1
    fi
    
    # Prep for build
    cleanup
    install_deps
    copy_settings
    update_repo
    copy_archiso
    # Rerun script as root to start Archiso build process
    run_elevated "$(realpath "$0")" --build-arch
}

# Check input
case $1 in
    --build-arch)
        build_arch
        ;;

    --install-deps)
        install_deps
        ;;

    --update-repo)
        update_repo
        ;;
    
    *)
        build_full
        ;;
esac