import subprocess
import argparse


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--check", action="store_true")

    args = parser.parse_args()

    output = subprocess.check_output(["text-generation-launcher", "--help"]).decode(
        "utf-8"
    )

    wrap_code_blocks_flag = "<!-- WRAP CODE BLOCKS -->"
    final_doc = f"# Text-generation-launcher arguments\n\n{wrap_code_blocks_flag}\n\n"

    lines = output.split("\n")

    header = ""
    block = []
    for line in lines:
        if line.startswith("  -") or line.startswith("      -"):
            rendered_block = '\n'.join(block)
            if header:
                final_doc += f"## {header}\n```shell\n{rendered_block}\n```\n"
            else:
                final_doc += f"```shell\n{rendered_block}\n```\n"
            block = []
            tokens = line.split("<")
            if len(tokens)>1:
                header = tokens[-1][:-1]
            else:
                header = line.split("--")[-1]
            header = header.upper().replace("-", "_")

        block.append(line)

    rendered_block = '\n'.join(block)
    final_doc += f"## {header}\n```shell\n{rendered_block}\n```\n"
    block = []

    filename = "docs/source/basic_tutorials/launcher.md"
    if args.check:
        with open(filename, "r") as f:
            doc = f.read()
            if doc != final_doc:
                tmp = "launcher.md"
                with open(tmp, "w") as g:
                    g.write(final_doc)
                diff = subprocess.run(
                    ["diff", tmp, filename], capture_output=True
                ).stdout.decode("utf-8")
                print(diff)
                raise Exception(
                    "Doc is not up-to-date, run `python update_doc.py` in order to update it"
                )
    else:
        with open(filename, "w") as f:
            f.write(final_doc)


if __name__ == "__main__":
    main()