# What is this?
## Cost calculation for Google AI Studio / Vertex AI models
import traceback
from typing import List, Literal, Optional, Tuple, Union

import litellm
from litellm import verbose_logger

"""
Gemini pricing covers: 
- token
- image
- audio
- video
"""

"""
Vertex AI -> character based pricing 

Google AI Studio -> token based pricing
"""

models_without_dynamic_pricing = ["gemini-1.0-pro", "gemini-pro"]


def _is_above_128k(tokens: float) -> bool:
    if tokens > 128000:
        return True
    return False


def cost_router(
    model: str,
    custom_llm_provider: str,
    prompt_tokens: float,
    completion_tokens: float,
    prompt_characters: float,
    completion_characters: float,
    call_type: Union[Literal["embedding", "aembedding"], str],
) -> Literal["cost_per_character", "cost_per_token"]:
    """
    Route the cost calc to the right place, based on model/call_type/etc.

    Returns
        - str, the specific google cost calc function it should route to.
    """
    if custom_llm_provider == "vertex_ai" and (
        "claude" in model
        or "llama" in model
        or "mistral" in model
        or "codestral" in model
    ):
        return "cost_per_token"
    elif custom_llm_provider == "gemini":
        return "cost_per_token"
    elif custom_llm_provider == "vertex_ai" and (
        call_type == "embedding" or call_type == "aembedding"
    ):
        return "cost_per_token"
    return "cost_per_character"


def cost_per_character(
    model: str,
    custom_llm_provider: str,
    prompt_tokens: float,
    completion_tokens: float,
    prompt_characters: float,
    completion_characters: float,
) -> Tuple[float, float]:
    """
    Calculates the cost per character for a given VertexAI model, input messages, and response object.

    Input:
        - model: str, the model name without provider prefix
        - custom_llm_provider: str, "vertex_ai-*"
        - prompt_characters: float, the number of input characters
        - completion_characters: float, the number of output characters

    Returns:
        Tuple[float, float] - prompt_cost_in_usd, completion_cost_in_usd

    Raises:
        Exception if model requires >128k pricing, but model cost not mapped
    """
    model_info = litellm.get_model_info(
        model=model, custom_llm_provider=custom_llm_provider
    )

    ## GET MODEL INFO
    model_info = litellm.get_model_info(
        model=model, custom_llm_provider=custom_llm_provider
    )

    ## CALCULATE INPUT COST
    try:
        if (
            _is_above_128k(tokens=prompt_characters * 4)  # 1 token = 4 char
            and model not in models_without_dynamic_pricing
        ):
            ## check if character pricing, else default to token pricing
            assert (
                "input_cost_per_character_above_128k_tokens" in model_info
                and model_info["input_cost_per_character_above_128k_tokens"] is not None
            ), "model info for model={} does not have 'input_cost_per_character_above_128k_tokens'-pricing for > 128k tokens\nmodel_info={}".format(
                model, model_info
            )
            prompt_cost = (
                prompt_characters
                * model_info["input_cost_per_character_above_128k_tokens"]
            )
        else:
            assert (
                "input_cost_per_character" in model_info
                and model_info["input_cost_per_character"] is not None
            ), "model info for model={} does not have 'input_cost_per_character'-pricing\nmodel_info={}".format(
                model, model_info
            )
            prompt_cost = prompt_characters * model_info["input_cost_per_character"]
    except Exception as e:
        verbose_logger.error(
            "litellm.litellm_core_utils.llm_cost_calc.google.cost_per_character(): Exception occured - {}\n{}\n\
                Defaulting to (cost_per_token * 4) calculation for prompt_cost".format(
                str(e), traceback.format_exc()
            )
        )
        initial_prompt_cost, _ = cost_per_token(
            model=model,
            custom_llm_provider=custom_llm_provider,
            prompt_tokens=prompt_tokens,
            completion_tokens=completion_tokens,
        )

        prompt_cost = initial_prompt_cost * 4

    ## CALCULATE OUTPUT COST
    try:
        if (
            _is_above_128k(tokens=completion_characters * 4)  # 1 token = 4 char
            and model not in models_without_dynamic_pricing
        ):
            assert (
                "output_cost_per_character_above_128k_tokens" in model_info
                and model_info["output_cost_per_character_above_128k_tokens"]
                is not None
            ), "model info for model={} does not have 'output_cost_per_character_above_128k_tokens' pricing\nmodel_info={}".format(
                model, model_info
            )
            completion_cost = (
                completion_tokens
                * model_info["output_cost_per_character_above_128k_tokens"]
            )
        else:
            assert (
                "output_cost_per_character" in model_info
                and model_info["output_cost_per_character"] is not None
            ), "model info for model={} does not have 'output_cost_per_character'-pricing\nmodel_info={}".format(
                model, model_info
            )
            completion_cost = (
                completion_tokens * model_info["output_cost_per_character"]
            )
    except Exception as e:
        verbose_logger.error(
            "litellm.litellm_core_utils.llm_cost_calc.google.cost_per_character(): Exception occured - {}\n{}\n\
                Defaulting to (cost_per_token * 4) calculation for completion_cost".format(
                str(e), traceback.format_exc()
            )
        )
        _, initial_completion_cost = cost_per_token(
            model=model,
            custom_llm_provider=custom_llm_provider,
            prompt_tokens=prompt_tokens,
            completion_tokens=completion_tokens,
        )

        completion_cost = initial_completion_cost * 4
    return prompt_cost, completion_cost


def cost_per_token(
    model: str,
    custom_llm_provider: str,
    prompt_tokens: float,
    completion_tokens: float,
) -> Tuple[float, float]:
    """
    Calculates the cost per token for a given model, prompt tokens, and completion tokens.

    Input:
        - model: str, the model name without provider prefix
        - custom_llm_provider: str, either "vertex_ai-*" or "gemini"
        - prompt_tokens: float, the number of input tokens
        - completion_tokens: float, the number of output tokens

    Returns:
        Tuple[float, float] - prompt_cost_in_usd, completion_cost_in_usd

    Raises:
        Exception if model requires >128k pricing, but model cost not mapped
    """
    ## GET MODEL INFO
    model_info = litellm.get_model_info(
        model=model, custom_llm_provider=custom_llm_provider
    )

    ## CALCULATE INPUT COST
    if (
        _is_above_128k(tokens=prompt_tokens)
        and model not in models_without_dynamic_pricing
    ):
        assert (
            "input_cost_per_token_above_128k_tokens" in model_info
            and model_info["input_cost_per_token_above_128k_tokens"] is not None
        ), "model info for model={} does not have pricing for > 128k tokens\nmodel_info={}".format(
            model, model_info
        )
        prompt_cost = (
            prompt_tokens * model_info["input_cost_per_token_above_128k_tokens"]
        )
    else:
        prompt_cost = prompt_tokens * model_info["input_cost_per_token"]

    ## CALCULATE OUTPUT COST
    if (
        _is_above_128k(tokens=completion_tokens)
        and model not in models_without_dynamic_pricing
    ):
        assert (
            "output_cost_per_token_above_128k_tokens" in model_info
            and model_info["output_cost_per_token_above_128k_tokens"] is not None
        ), "model info for model={} does not have pricing for > 128k tokens\nmodel_info={}".format(
            model, model_info
        )
        completion_cost = (
            completion_tokens * model_info["output_cost_per_token_above_128k_tokens"]
        )
    else:
        completion_cost = completion_tokens * model_info["output_cost_per_token"]

    return prompt_cost, completion_cost
