# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the terms described in the LICENSE file in
# the root directory of this source tree.
from typing import Any, Dict, List, Literal, Optional, Protocol, Union

from pydantic import BaseModel, Field
from typing_extensions import Annotated

from llama_stack.apis.agents import AgentConfig
from llama_stack.apis.common.job_types import CommonJobFields, JobType
from llama_stack.apis.datasets import DataSource
from llama_stack.apis.inference import SamplingParams, SystemMessage
from llama_stack.schema_utils import json_schema_type, register_schema, webmethod


@json_schema_type
class ModelCandidate(BaseModel):
    """A model candidate for evaluation.

    :param model: The model ID to evaluate.
    :param sampling_params: The sampling parameters for the model.
    :param system_message: (Optional) The system message providing instructions or context to the model.
    """

    type: Literal["model"] = "model"
    model_id: str
    sampling_params: SamplingParams
    system_message: Optional[SystemMessage] = None


@json_schema_type
class AgentCandidate(BaseModel):
    """An agent candidate for evaluation.

    :param config: The configuration for the agent candidate.
    """

    type: Literal["agent"] = "agent"
    config: AgentConfig


EvaluationCandidate = register_schema(
    Annotated[Union[ModelCandidate, AgentCandidate], Field(discriminator="type")],
    name="EvaluationCandidate",
)


@json_schema_type
class BenchmarkTask(BaseModel):
    type: Literal["benchmark_id"] = "benchmark_id"
    benchmark_id: str


@json_schema_type
class DatasetGraderTask(BaseModel):
    type: Literal["dataset_grader"] = "dataset_grader"
    dataset_id: str
    grader_ids: List[str]


@json_schema_type
class DataSourceGraderTask(BaseModel):
    type: Literal["data_source_grader"] = "data_source_grader"
    data_source: DataSource
    grader_ids: List[str]


EvaluationTask = register_schema(
    Annotated[
        Union[BenchmarkTask, DatasetGraderTask, DataSourceGraderTask],
        Field(discriminator="type"),
    ],
    name="EvaluationTask",
)


@json_schema_type
class EvaluationJob(CommonJobFields):
    type: Literal[JobType.evaluation.value] = JobType.evaluation.value

    # input params for the submitted evaluation job
    task: EvaluationTask
    candidate: EvaluationCandidate


@json_schema_type
class ScoringResult(BaseModel):
    """
    A scoring result for a single row.

    :param scores: The scoring result for each row. Each row is a map of grader column name to value.
    :param metrics: Map of metric name to aggregated value.
    """

    scores: List[Dict[str, Any]]
    metrics: Dict[str, Any]


@json_schema_type
class EvaluationResponse(BaseModel):
    """
    A response to an inline evaluation.

    :param generations: The generations in rows for the evaluation.
    :param scores: The scores for the evaluation. Map of grader id to ScoringResult.
    """

    generations: List[Dict[str, Any]]
    scores: Dict[str, ScoringResult]


class Evaluation(Protocol):
    @webmethod(route="/evaluation/run", method="POST")
    async def run(
        self,
        task: EvaluationTask,
        candidate: EvaluationCandidate,
    ) -> EvaluationJob:
        """
        Run an evaluation job.

        :param task: The task to evaluate. One of:
         - BenchmarkTask: Run evaluation task against a benchmark_id
         - DatasetGraderTask: Run evaluation task against a dataset_id and a list of grader_ids
         - DataSourceGraderTask: Run evaluation task against a data source (e.g. rows, uri, etc.) and a list of grader_ids
        :param candidate: The candidate to evaluate.
        """
        ...

    @webmethod(route="/evaluation/run_inline", method="POST")
    async def run_inline(
        self,
        task: EvaluationTask,
        candidate: EvaluationCandidate,
    ) -> EvaluationResponse:
        """
        Run an evaluation job inline.

        :param task: The task to evaluate. One of:
         - BenchmarkTask: Run evaluation task against a benchmark_id
         - DatasetGraderTask: Run evaluation task against a dataset_id and a list of grader_ids
         - DataSourceGraderTask: Run evaluation task against a data source (e.g. rows, uri, etc.) and a list of grader_ids
        :param candidate: The candidate to evaluate.
        """
        ...

    @webmethod(route="/evaluation/grade", method="POST")
    async def grade(self, task: EvaluationTask) -> EvaluationJob:
        """
        Run an grading job with generated results. Use this when you have generated results from inference in a dataset.

        :param task: The task to evaluate. One of:
         - BenchmarkTask: Run evaluation task against a benchmark_id
         - DatasetGraderTask: Run evaluation task against a dataset_id and a list of grader_ids
         - DataSourceGraderTask: Run evaluation task against a data source (e.g. rows, uri, etc.) and a list of grader_ids

        :return: The evaluation job containing grader scores.
        """
        ...

    @webmethod(route="/evaluation/grade_inline", method="POST")
    async def grade_inline(self, task: EvaluationTask) -> EvaluationResponse:
        """
        Run an grading job with generated results inline.

        :param task: The task to evaluate. One of:
         - BenchmarkTask: Run evaluation task against a benchmark_id
         - DatasetGraderTask: Run evaluation task against a dataset_id and a list of grader_ids
         - DataSourceGraderTask: Run evaluation task against a data source (e.g. rows, uri, etc.) and a list of grader_ids

        :return: The evaluation job containing grader scores. "generations" is not populated in the response.
        """
        ...