#!/usr/bin/bash

# This file is part of noxos and licensed under the MIT open source license

set -e

workspace_setup() {
    echo "  --> Setting up workspace"
    mkdir -pv build
    mkdir -pv build/cmake
    echo ""
}

check_toolchain() {
  echo "  --> Checking Toolchain"
  hash gcc
  echo "   |--> found gcc"
  hash ld
  echo "   |--> found ld"
  hash nasm
  echo "   |--> found nasm"
  hash cmake
  echo "   |--> found cmake"
  hash xorriso
  echo "   |--> found xorriso"
  hash qemu-system-x86_64
  echo "   |--> found qemu"

  [ ! -d "/usr/share/ovmf/x64/" ] && echo "OVMF binaries not found!" && exit 255
  echo "   |--> found ovmf"

  echo "  --> All checks passed"
}


kernel_build() {
    echo "  --> Building kernel"
    cd build/cmake
    cmake -S ../.. -B .
    make
    cd ../..
    echo ""
}

libnx_build() {
  cd ../libnx
  bash build.sh
  cd ../kernel
}

shell_build() {
  gcc shell.c -o ramdisk/shell.elf -nostdlib -nolibc -fno-stack-protector -I../libnx/inc ../libnx/build/cmake/libnx.so
}


limine_install() {
    echo "  --> Installing Limine"
    cd build
    rm -rfv limine
    echo "   |--> Cloning repository"
    git clone https://github.com/limine-bootloader/limine.git --branch=v4.x-branch-binary --depth=1
    echo "   |--> Compiling Limine"
    make -C limine
    cd ..
    echo ""
}

generate_initial_ramdisk() {
  echo "  --> Generating initrd"
  tar -C ramdisk -cvf build/initrd.tar .
}

generate_image() {
    echo "  --> Generating Image"
    cd build

    rm -rfv iso
    mkdir -pv iso

    cp limine/limine-cd.bin     iso
    cp limine/limine-cd-efi.bin iso
    cp limine/limine.sys        iso
    cp ../limine.cfg            iso
    cp initrd.tar               iso
    cp cmake/kernel             iso/kernel.elf

    xorriso -as mkisofs -b limine-cd.bin \
            -no-emul-boot -boot-load-size 4 -boot-info-table \
            --efi-boot limine-cd-efi.bin \
            -efi-boot-part --efi-boot-image --protective-msdos-label \
            iso -o noxos.iso

    ./limine/limine-deploy noxos.iso

    rm -rfv iso

    cd ..
    echo ""
}

echo "!=====[ NoxOS build script ]=====!"

case $1 in
    "check")
        check_toolchain
        ;;
    *)
        workspace_setup
        kernel_build
        [ ! -d "build/limine" ] && limine_install
        libnx_build
        shell_build
        generate_initial_ramdisk
        generate_image
        ;;
esac

echo "!=====[ Finished ]=====!"