import os
import shutil
import subprocess
import time
from multiprocessing import Pool


CC = "g++"
ARCH_FLAGS = "-m64 -march=x86-64 -mabi=sysv -mno-80387 -mno-red-zone -mcmodel=kernel -MMD -MP"
WARN_FLAGS = "-Wall -Wextra"
STANDART_FLAGS = "-std=gnu11"
PROTECT_FLAGS = "-O0 -pipe -ffreestanding -fno-stack-protector -fno-lto -fno-stack-check -fno-PIC -fno-PIE"
CHARSET_FLAGS = "-finput-charset=UTF-8 -fexec-charset=cp1251"
LIBS_FLAGS = "-Ilimine -Iinclude"


def find_files(directory, extensions):
    file_list = []
    for root, dirs, files in os.walk(directory):
        for file in files:
            if any(file.endswith(extension) for extension in extensions):
                file_list.append(os.path.join(root, file))
    return file_list


def compile(file: str):
    output_file = file.replace('/', '_')
    obj_file = f"bin/{output_file}.o"
    cmd = f"{CC} {WARN_FLAGS} {PROTECT_FLAGS} {ARCH_FLAGS} {CHARSET_FLAGS} {LIBS_FLAGS} -c {file} -o {obj_file}"
    print(cmd)
    os.system(cmd)
    return obj_file


def compile_all():
    file_list = find_files("kernel/", [".c", ".cpp", ".s"])

    with Pool() as pool:
        results = pool.map(compile, file_list)

    while not all(results):
        print(results)
        time.sleep(1)
    print(results)
    cmd = f"ld -nostdlib -static -m elf_x86_64 -z max-page-size=0x1000 -T configs/linker.ld -o kernel.elf {' '.join(results)}"
    print(cmd)
    os.system(cmd)


def check_limine():
    if not os.path.isdir("limine"):
        subprocess.run(["git", "clone", "https://github.com/limine-bootloader/limine.git", "--branch=v5.x-branch-binary", "--depth=1"])
    else:
        os.chdir("limine")
        subprocess.run(["git", "pull"])
        os.chdir("..")
    os.chdir("limine")
    subprocess.run(["make"])
    os.chdir("..")


def check_tools():
    required_tools = ["g++", "xorriso", "make", "mtools"]
    missing_tools = []

    for tool in required_tools:
        if shutil.which(tool) is None:
            missing_tools.append(tool)

    if len(missing_tools) > 0:
        subprocess.run(["sudo", "apt", "install"] + missing_tools)


def create_iso(IMAGE_NAME):
    subprocess.run(["rm", "-rf", "iso_root"])
    subprocess.run(["mkdir", "-p", "iso_root"])
    subprocess.run(["cp", "-v", "iso_root/"])
    subprocess.run(["cp", "-v", "kernel.elf", 
                    "configs/limine.cfg", "limine/limine-bios.sys", 
                    "limine/limine-bios-cd.bin", "limine/limine-uefi-cd.bin", 
                    "iso_root/"])
    subprocess.run(["mkdir", "-p", "iso_root/EFI/BOOT"])
    subprocess.run(["cp", "-v", "limine/BOOTX64.EFI", "iso_root/EFI/BOOT/"])
    subprocess.run(["cp", "-v", "limine/BOOTIA32.EFI", "iso_root/EFI/BOOT/"])
    subprocess.run(["xorriso", "-as", "mkisofs", "-b", "limine-bios-cd.bin",
                    "-no-emul-boot", "-boot-load-size", "4", "-boot-info-table",
                    "--efi-boot", "limine-uefi-cd.bin",
                    "-efi-boot-part", "--efi-boot-image", "--protective-msdos-label",
                    "iso_root", "-o", IMAGE_NAME+".iso"])
    subprocess.run(["./limine/limine", "bios-install", IMAGE_NAME+".iso"])
    subprocess.run(["rm", "-rf", "iso_root"])

def create_hdd(IMAGE_NAME):
    subprocess.run(["rm", "-f", IMAGE_NAME+".hdd"])
    subprocess.run(["dd", "if=/dev/zero", "bs=1M", "count=0", "seek=64", "of="+IMAGE_NAME+".hdd"])
    subprocess.run(["sgdisk", IMAGE_NAME+".hdd", "-n", "1:2048", "-t", "1:ef00"])
    subprocess.run(["./limine/limine", "bios-install", IMAGE_NAME+".hdd"])
    subprocess.run(["mformat", "-i", IMAGE_NAME+".hdd@@1M"])
    subprocess.run(["mmd", "-i", IMAGE_NAME+".hdd@@1M", "::/EFI", "::/EFI/BOOT"])
    subprocess.run(["mcopy", "-i", IMAGE_NAME+".hdd@@1M",
                    "kernel.elf", "configs/limine.cfg", "limine/limine-bios.sys", "::/"])
    subprocess.run(["mcopy", "-i", IMAGE_NAME+".hdd@@1M", 
                    "limine/BOOTX64.EFI", "limine/BOOTIA32.EFI", "::/EFI/BOOT"])


if __name__ == "__main__":
    subprocess.run(["rm", "-rf", "bin"])
    subprocess.run(["mkdir", "-p", "bin"])

    if not os.path.isdir("ovmf"):
        subprocess.run(["mkdir", "-p", "ovmf"])
        os.chdir("ovmf")
        subprocess.run(["curl", "-Lo", "OVMF.fd", "https://retrage.github.io/edk2-nightly/bin/RELEASEX64_OVMF.fd"])
        os.chdir("..")

    check_limine()
    check_tools()
    compile_all()
    create_hdd("mseos")
    create_iso("mseos")

    print("qemu-system-x86_64 -M q35 -m 8G -smp 8 -bios ovmf/OVMF.fd -hda mseos.hdd")