#  Copyright 2021-present, the Recognai S.L. team.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

from typing import List, Optional
from uuid import UUID

from fastapi import APIRouter, Depends, HTTPException, Security, status
from sqlalchemy.ext.asyncio import AsyncSession

from argilla.server.contexts import accounts, datasets
from argilla.server.database import get_async_db
from argilla.server.enums import ResponseStatusFilter
from argilla.server.models import Dataset as DatasetModel
from argilla.server.models import ResponseStatus, User
from argilla.server.policies import DatasetPolicyV1, MetadataPropertyPolicyV1, authorize, is_authorized
from argilla.server.schemas.v1.datasets import (
    Dataset,
    DatasetCreate,
    Datasets,
    DatasetUpdate,
    Field,
    FieldCreate,
    Fields,
    MetadataProperties,
    MetadataProperty,
    MetadataPropertyCreate,
    Metrics,
    Question,
    QuestionCreate,
    Questions,
    VectorSettings,
    VectorSettingsCreate,
    VectorsSettings,
)
from argilla.server.search_engine import (
    SearchEngine,
    get_search_engine,
)
from argilla.server.security import auth
from argilla.server.telemetry import TelemetryClient, get_telemetry_client

CREATE_DATASET_VECTOR_SETTINGS_MAX_COUNT = 5

router = APIRouter()


async def _get_dataset(
    db: AsyncSession,
    dataset_id: UUID,
    with_fields: bool = False,
    with_questions: bool = False,
    with_metadata_properties: bool = False,
    with_vectors_settings: bool = False,
) -> DatasetModel:
    dataset = await datasets.get_dataset_by_id(
        db,
        dataset_id,
        with_fields=with_fields,
        with_questions=with_questions,
        with_metadata_properties=with_metadata_properties,
        with_vectors_settings=with_vectors_settings,
    )
    if not dataset:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Dataset with id `{dataset_id}` not found",
        )
    return dataset


async def _filter_metadata_properties_by_policy(
    current_user: User, metadata_properties: List[MetadataProperty]
) -> List[MetadataProperty]:
    filtered_metadata_properties = []

    for metadata_property in metadata_properties:
        metadata_property_is_authorized = await is_authorized(
            current_user, MetadataPropertyPolicyV1.get(metadata_property)
        )

        if metadata_property_is_authorized:
            filtered_metadata_properties.append(metadata_property)

    return filtered_metadata_properties


@router.get("/me/datasets", response_model=Datasets)
async def list_current_user_datasets(
    *,
    db: AsyncSession = Depends(get_async_db),
    workspace_id: Optional[UUID] = None,
    current_user: User = Security(auth.get_current_user),
):
    await authorize(current_user, DatasetPolicyV1.list(workspace_id))

    if not workspace_id:
        if current_user.is_owner:
            dataset_list = await datasets.list_datasets(db)
        else:
            await current_user.awaitable_attrs.datasets
            dataset_list = current_user.datasets
    else:
        dataset_list = await datasets.list_datasets_by_workspace_id(db, workspace_id)

    return Datasets(items=dataset_list)


@router.get("/datasets/{dataset_id}/fields", response_model=Fields)
async def list_dataset_fields(
    *, db: AsyncSession = Depends(get_async_db), dataset_id: UUID, current_user: User = Security(auth.get_current_user)
):
    dataset = await _get_dataset(db, dataset_id, with_fields=True)

    await authorize(current_user, DatasetPolicyV1.get(dataset))

    return Fields(items=dataset.fields)


@router.get("/datasets/{dataset_id}/questions", response_model=Questions)
async def list_dataset_questions(
    *, db: AsyncSession = Depends(get_async_db), dataset_id: UUID, current_user: User = Security(auth.get_current_user)
):
    dataset = await _get_dataset(db, dataset_id, with_questions=True)

    await authorize(current_user, DatasetPolicyV1.get(dataset))

    return Questions(items=dataset.questions)


@router.get("/datasets/{dataset_id}/vectors-settings", response_model=VectorsSettings)
async def list_dataset_vector_settings(
    *, db: AsyncSession = Depends(get_async_db), dataset_id: UUID, current_user: User = Security(auth.get_current_user)
):
    dataset = await _get_dataset(db, dataset_id, with_vectors_settings=True)

    await authorize(current_user, DatasetPolicyV1.get(dataset))

    return VectorsSettings(items=dataset.vectors_settings)


@router.get("/me/datasets/{dataset_id}/metadata-properties", response_model=MetadataProperties)
async def list_current_user_dataset_metadata_properties(
    *, db: AsyncSession = Depends(get_async_db), dataset_id: UUID, current_user: User = Security(auth.get_current_user)
):
    dataset = await _get_dataset(db, dataset_id, with_metadata_properties=True)

    await authorize(current_user, DatasetPolicyV1.get(dataset))

    filtered_metadata_properties = await _filter_metadata_properties_by_policy(
        current_user, dataset.metadata_properties
    )

    return MetadataProperties(items=filtered_metadata_properties)


@router.get("/datasets/{dataset_id}", response_model=Dataset)
async def get_dataset(
    *, db: AsyncSession = Depends(get_async_db), dataset_id: UUID, current_user: User = Security(auth.get_current_user)
):
    dataset = await _get_dataset(db, dataset_id)

    await authorize(current_user, DatasetPolicyV1.get(dataset))

    return dataset


@router.get("/me/datasets/{dataset_id}/metrics", response_model=Metrics)
async def get_current_user_dataset_metrics(
    *, db: AsyncSession = Depends(get_async_db), dataset_id: UUID, current_user: User = Security(auth.get_current_user)
):
    dataset = await _get_dataset(db, dataset_id)

    await authorize(current_user, DatasetPolicyV1.get(dataset))

    return {
        "records": {
            "count": await datasets.count_records_by_dataset_id(db, dataset_id),
        },
        "responses": {
            "count": await datasets.count_responses_by_dataset_id_and_user_id(db, dataset_id, current_user.id),
            "submitted": await datasets.count_responses_by_dataset_id_and_user_id(
                db, dataset_id, current_user.id, ResponseStatus(ResponseStatusFilter.submitted)
            ),
            "discarded": await datasets.count_responses_by_dataset_id_and_user_id(
                db, dataset_id, current_user.id, ResponseStatus(ResponseStatusFilter.discarded)
            ),
            "draft": await datasets.count_responses_by_dataset_id_and_user_id(
                db, dataset_id, current_user.id, ResponseStatus(ResponseStatusFilter.draft)
            ),
        },
    }


@router.post("/datasets", status_code=status.HTTP_201_CREATED, response_model=Dataset)
async def create_dataset(
    *,
    db: AsyncSession = Depends(get_async_db),
    dataset_create: DatasetCreate,
    current_user: User = Security(auth.get_current_user),
):
    await authorize(current_user, DatasetPolicyV1.create(dataset_create.workspace_id))

    if not await accounts.get_workspace_by_id(db, dataset_create.workspace_id):
        raise HTTPException(
            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
            detail=f"Workspace with id `{dataset_create.workspace_id}` not found",
        )

    if await datasets.get_dataset_by_name_and_workspace_id(db, dataset_create.name, dataset_create.workspace_id):
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail=f"Dataset with name `{dataset_create.name}` already exists for workspace with id `{dataset_create.workspace_id}`",
        )

    dataset = await datasets.create_dataset(db, dataset_create)
    return dataset


@router.post("/datasets/{dataset_id}/fields", status_code=status.HTTP_201_CREATED, response_model=Field)
async def create_dataset_field(
    *,
    db: AsyncSession = Depends(get_async_db),
    dataset_id: UUID,
    field_create: FieldCreate,
    current_user: User = Security(auth.get_current_user),
):
    dataset = await _get_dataset(db, dataset_id)

    await authorize(current_user, DatasetPolicyV1.create_field(dataset))

    if await datasets.get_field_by_name_and_dataset_id(db, field_create.name, dataset_id):
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail=f"Field with name `{field_create.name}` already exists for dataset with id `{dataset_id}`",
        )

    # TODO: We should split API v1 into different FastAPI apps so we can customize error management.
    # After mapping ValueError to 422 errors for API v1 then we can remove this try except.
    try:
        field = await datasets.create_field(db, dataset, field_create)
        return field
    except ValueError as err:
        raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail=str(err))


@router.post("/datasets/{dataset_id}/questions", status_code=status.HTTP_201_CREATED, response_model=Question)
async def create_dataset_question(
    *,
    db: AsyncSession = Depends(get_async_db),
    dataset_id: UUID,
    question_create: QuestionCreate,
    current_user: User = Security(auth.get_current_user),
):
    dataset = await _get_dataset(db, dataset_id)

    await authorize(current_user, DatasetPolicyV1.create_question(dataset))

    if await datasets.get_question_by_name_and_dataset_id(db, question_create.name, dataset_id):
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail=f"Question with name `{question_create.name}` already exists for dataset with id `{dataset_id}`",
        )

    # TODO: We should split API v1 into different FastAPI apps so we can customize error management.
    # After mapping ValueError to 422 errors for API v1 then we can remove this try except.
    try:
        question = await datasets.create_question(db, dataset, question_create)
        return question
    except ValueError as err:
        raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail=str(err))


@router.post(
    "/datasets/{dataset_id}/metadata-properties", status_code=status.HTTP_201_CREATED, response_model=MetadataProperty
)
async def create_dataset_metadata_property(
    *,
    db: AsyncSession = Depends(get_async_db),
    search_engine: SearchEngine = Depends(get_search_engine),
    dataset_id: UUID,
    metadata_property_create: MetadataPropertyCreate,
    current_user: User = Security(auth.get_current_user),
):
    dataset = await _get_dataset(db, dataset_id)

    await authorize(current_user, DatasetPolicyV1.create_metadata_property(dataset))

    if await datasets.get_metadata_property_by_name_and_dataset_id(db, metadata_property_create.name, dataset_id):
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail=f"Metadata property with name `{metadata_property_create.name}` "
            f"already exists for dataset with id `{dataset_id}`",
        )

    # TODO: We should split API v1 into different FastAPI apps so we can customize error management.
    # After mapping ValueError to 422 errors for API v1 then we can remove this try except.
    try:
        metadata_property = await datasets.create_metadata_property(
            db, search_engine, dataset, metadata_property_create
        )
        return metadata_property
    except ValueError as err:
        raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail=str(err))


@router.post(
    "/datasets/{dataset_id}/vectors-settings", status_code=status.HTTP_201_CREATED, response_model=VectorSettings
)
async def create_dataset_vector_settings(
    *,
    db: AsyncSession = Depends(get_async_db),
    search_engine: SearchEngine = Depends(get_search_engine),
    dataset_id: UUID,
    vector_settings_create: VectorSettingsCreate,
    current_user: User = Security(auth.get_current_user),
):
    dataset = await _get_dataset(db, dataset_id)

    await authorize(current_user, DatasetPolicyV1.create_vector_settings(dataset))

    count_vectors_settings_by_dataset_id = await datasets.count_vectors_settings_by_dataset_id(db, dataset_id)
    if count_vectors_settings_by_dataset_id >= CREATE_DATASET_VECTOR_SETTINGS_MAX_COUNT:
        raise HTTPException(
            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
            detail=f"The maximum number of vector settings has been reached for dataset with id `{dataset_id}`",
        )

    if await datasets.get_vector_settings_by_name_and_dataset_id(db, vector_settings_create.name, dataset_id):
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail=f"Vector settings with name `{vector_settings_create.name}` already exists for dataset with id"
            f" `{dataset_id}`",
        )

    try:
        vector_settings = await datasets.create_vector_settings(
            db, search_engine, dataset=dataset, vector_settings_create=vector_settings_create
        )
        return vector_settings
    except ValueError as err:
        raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail=str(err))


@router.put("/datasets/{dataset_id}/publish", response_model=Dataset)
async def publish_dataset(
    *,
    db: AsyncSession = Depends(get_async_db),
    search_engine: SearchEngine = Depends(get_search_engine),
    telemetry_client: TelemetryClient = Depends(get_telemetry_client),
    dataset_id: UUID,
    current_user: User = Security(auth.get_current_user),
) -> DatasetModel:
    dataset = await _get_dataset(
        db, dataset_id, with_fields=True, with_questions=True, with_metadata_properties=True, with_vectors_settings=True
    )

    await authorize(current_user, DatasetPolicyV1.publish(dataset))
    # TODO: We should split API v1 into different FastAPI apps so we can customize error management.
    #  After mapping ValueError to 422 errors for API v1 then we can remove this try except.
    try:
        dataset = await datasets.publish_dataset(db, search_engine, dataset)

        telemetry_client.track_data(
            action="PublishedDataset",
            data={"questions": list(set([question.settings["type"] for question in dataset.questions]))},
        )

        return dataset
    except ValueError as err:
        raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail=str(err))


@router.delete("/datasets/{dataset_id}", response_model=Dataset)
async def delete_dataset(
    *,
    db: AsyncSession = Depends(get_async_db),
    search_engine: SearchEngine = Depends(get_search_engine),
    dataset_id: UUID,
    current_user: User = Security(auth.get_current_user),
):
    dataset = await _get_dataset(db, dataset_id)

    await authorize(current_user, DatasetPolicyV1.delete(dataset))

    await datasets.delete_dataset(db, search_engine, dataset=dataset)

    return dataset


@router.patch("/datasets/{dataset_id}", response_model=Dataset)
async def update_dataset(
    *,
    db: AsyncSession = Depends(get_async_db),
    dataset_id: UUID,
    dataset_update: DatasetUpdate,
    current_user: User = Security(auth.get_current_user),
):
    dataset = await _get_dataset(db, dataset_id)

    await authorize(current_user, DatasetPolicyV1.update(dataset))

    return await datasets.update_dataset(db, dataset=dataset, dataset_update=dataset_update)
