"""Router for the concept database."""

from typing import Annotated, Iterable, Optional, cast

from fastapi import APIRouter, HTTPException
from fastapi.params import Depends
from openai_function_call import OpenAISchema
from pydantic import BaseModel, Field

from .auth import UserInfo, get_session_user
from .concepts.concept import (
  DRAFT_MAIN,
  Concept,
  ConceptMetrics,
  ConceptType,
  DraftId,
  draft_examples,
)
from .concepts.db_concept import DISK_CONCEPT_DB, DISK_CONCEPT_MODEL_DB, ConceptInfo, ConceptUpdate
from .env import env
from .router_utils import RouteErrorHandler, server_compute_concept
from .schema import RichData
from .signals.concept_scorer import ConceptSignal

router = APIRouter(route_class=RouteErrorHandler)


@router.get('/', response_model_exclude_none=True)
def get_concepts(
    user: Annotated[Optional[UserInfo], Depends(get_session_user)]) -> list[ConceptInfo]:
  """List the concepts."""
  return DISK_CONCEPT_DB.list(user)


@router.get('/{namespace}/{concept_name}', response_model_exclude_none=True)
def get_concept(namespace: str,
                concept_name: str,
                draft: Optional[DraftId] = DRAFT_MAIN,
                user: Annotated[Optional[UserInfo], Depends(get_session_user)] = None) -> Concept:
  """Get a concept from a database."""
  concept = DISK_CONCEPT_DB.get(namespace, concept_name, user)
  if not concept:
    raise HTTPException(
      status_code=404,
      detail=f'Concept "{namespace}/{concept_name}" was not found or user does not have access.')

  # Only return the examples from the draft.
  concept.data = draft_examples(concept, draft or DRAFT_MAIN)

  return concept


class CreateConceptOptions(BaseModel):
  """Options for creating a concept."""
  # Namespace of the concept.
  namespace: str
  # Name of the concept.
  name: str
  # Input type (modality) of the concept.
  type: ConceptType
  description: Optional[str] = None


@router.post('/create', response_model_exclude_none=True)
def create_concept(options: CreateConceptOptions,
                   user: Annotated[Optional[UserInfo],
                                   Depends(get_session_user)]) -> Concept:
  """Edit a concept in the database."""
  return DISK_CONCEPT_DB.create(options.namespace, options.name, options.type, options.description,
                                user)


@router.post('/{namespace}/{concept_name}', response_model_exclude_none=True)
def edit_concept(namespace: str, concept_name: str, change: ConceptUpdate,
                 user: Annotated[Optional[UserInfo], Depends(get_session_user)]) -> Concept:
  """Edit a concept in the database."""
  return DISK_CONCEPT_DB.edit(namespace, concept_name, change, user)


@router.delete('/{namespace}/{concept_name}')
def delete_concept(namespace: str, concept_name: str,
                   user: Annotated[Optional[UserInfo],
                                   Depends(get_session_user)]) -> None:
  """Deletes the concept from the database."""
  DISK_CONCEPT_DB.remove(namespace, concept_name, user)


class MergeConceptDraftOptions(BaseModel):
  """Merge a draft into main."""
  draft: DraftId


@router.post('/{namespace}/{concept_name}/merge_draft', response_model_exclude_none=True)
def merge_concept_draft(namespace: str, concept_name: str, options: MergeConceptDraftOptions,
                        user: Annotated[Optional[UserInfo],
                                        Depends(get_session_user)]) -> Concept:
  """Merge a draft in the concept into main."""
  return DISK_CONCEPT_DB.merge_draft(namespace, concept_name, options.draft, user)


class ScoreExample(BaseModel):
  """Example to score along a specific concept."""
  text: Optional[str] = None
  img: Optional[bytes] = None


class ScoreBody(BaseModel):
  """Request body for the score endpoint."""
  examples: list[ScoreExample]
  draft: str = DRAFT_MAIN


class ConceptModelInfo(BaseModel):
  """Information about a concept model."""
  namespace: str
  concept_name: str
  embedding_name: str
  version: int
  metrics: Optional[ConceptMetrics] = None


@router.get('/{namespace}/{concept_name}/model')
def get_concept_models(
    namespace: str,
    concept_name: str,
    user: Annotated[Optional[UserInfo],
                    Depends(get_session_user)] = None) -> list[ConceptModelInfo]:
  """Get a concept model from a database."""
  concept = DISK_CONCEPT_DB.get(namespace, concept_name, user)
  if not concept:
    raise HTTPException(
      status_code=404, detail=f'Concept "{namespace}/{concept_name}" was not found')
  models = DISK_CONCEPT_MODEL_DB.get_models(namespace, concept_name, user)

  for m in models:
    DISK_CONCEPT_MODEL_DB.sync(m.namespace, m.concept_name, m.embedding_name, user)

  return [
    ConceptModelInfo(
      namespace=m.namespace,
      concept_name=m.concept_name,
      embedding_name=m.embedding_name,
      version=m.version,
      metrics=m.get_metrics()) for m in models
  ]


@router.get('/{namespace}/{concept_name}/model/{embedding_name}')
def get_concept_model(
  namespace: str,
  concept_name: str,
  embedding_name: str,
  create_if_not_exists: bool = False,
  user: Annotated[Optional[UserInfo], Depends(get_session_user)] = None
) -> Optional[ConceptModelInfo]:
  """Get a concept model from a database."""
  concept = DISK_CONCEPT_DB.get(namespace, concept_name, user)
  if not concept:
    raise HTTPException(
      status_code=404, detail=f'Concept "{namespace}/{concept_name}" was not found')

  model = DISK_CONCEPT_MODEL_DB.get(namespace, concept_name, embedding_name, user)
  if not model and not create_if_not_exists:
    return None

  model = DISK_CONCEPT_MODEL_DB.sync(
    namespace, concept_name, embedding_name, user=user, create=create_if_not_exists)
  model_info = ConceptModelInfo(
    namespace=model.namespace,
    concept_name=model.concept_name,
    embedding_name=model.embedding_name,
    version=model.version,
    metrics=model.get_metrics())
  return model_info


@router.post(
  '/{namespace}/{concept_name}/model/{embedding_name}/score', response_model_exclude_none=True)
def score(namespace: str, concept_name: str, embedding_name: str, body: ScoreBody,
          user: Annotated[Optional[UserInfo], Depends(get_session_user)]) -> list[list[dict]]:
  """Score examples along the specified concept."""
  concept_scorer = ConceptSignal(
    namespace=namespace, concept_name=concept_name, embedding=embedding_name)
  concept_scorer.set_user(user)
  return cast(
    list[list[dict]],
    server_compute_concept(concept_scorer, cast(Iterable[RichData],
                                                [e.text for e in body.examples]), user))


class Examples(OpenAISchema):
  """Generated text examples."""
  examples: list[str] = Field(..., description='List of generated examples')


@router.get('/generate_examples')
def generate_examples(description: str) -> list[str]:
  """Generate positive examples for a given concept using an LLM model."""
  try:
    import openai
  except ImportError:
    raise ImportError('Could not import the "openai" python package. '
                      'Please install it with `pip install openai`.')

  openai.api_key = env('OPENAI_API_KEY')
  completion = openai.ChatCompletion.create(
    model='gpt-3.5-turbo-0613',
    functions=[Examples.openai_schema],
    messages=[
      {
        'role': 'system',
        'content': 'You must call the `Examples` function with the generated examples',
      },
      {
        'role': 'user',
        'content': f'Write 5 diverse, unnumbered, and concise examples of "{description}"',
      },
    ],
  )
  result = Examples.from_response(completion)
  return result.examples