import time
from typing import Tuple

from vllm import SamplingParams
from vllm.sequence import Sequence, SequenceGroup


def create_dummy_prompt(
        request_id: str,
        prompt_length: int,
        block_size: int = None) -> Tuple[Sequence, SequenceGroup]:
    if not block_size:
        block_size = prompt_length

    # Create dummy prompt sequence with tokens 0...block_size-1
    # and prompt "0 ... block_size".
    prompt_tokens = list(range(prompt_length))
    prompt_str = " ".join([str(t) for t in prompt_tokens])
    prompt = Sequence(int(request_id), prompt_str, prompt_tokens, block_size)
    seq_group = SequenceGroup(request_id, [prompt], SamplingParams(),
                              time.time(), None)

    return prompt, seq_group


def round_up_to_next_block(seq_len: int, block_size: int) -> int:
    return (seq_len + block_size - 1) // block_size