"""
Moonstream Engine Play API.
"""
import logging
from typing import List, Optional
from uuid import UUID

from fastapi import Request, Depends, Query
from sqlalchemy.orm import Session
from sqlalchemy.orm.exc import NoResultFound
from hexbytes import HexBytes
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from web3 import Web3

from ..models import DropperClaimant
from .. import actions
from .. import data
from .. import db
from .. import signatures
from ..contracts import Dropper_interface
from ..middleware import EngineHTTPException
from ..settings import BLOCKCHAIN_WEB3_PROVIDERS, DOCS_TARGET_PATH
from ..version import VERSION


logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

tags_metadata = [{"name": "Play", "description": "Moonstream Engine Play API"}]


app = FastAPI(
    title=f"Moonstream Engine Play API",
    description="Moonstream Engine Play API endpoints.",
    version=VERSION,
    openapi_tags=tags_metadata,
    openapi_url="/openapi.json",
    docs_url=None,
    redoc_url=f"/{DOCS_TARGET_PATH}",
)


app.add_middleware(
    CORSMiddleware,
    allow_origins="*",
    allow_credentials=False,
    allow_methods=["*"],
    allow_headers=["*"],
)


@app.get("/blockchains")
async def get_drops_blockchains_handler(
    db_session: Session = Depends(db.yield_db_session),
) -> List[data.DropperBlockchainResponse]:
    """
    Get list of blockchains.
    """

    try:
        results = actions.list_drops_blockchains(db_session=db_session)
    except NoResultFound:
        raise EngineHTTPException(status_code=404, detail="No drops found.")
    except Exception as e:
        logger.error(f"Can't get list of drops end with error: {e}")
        raise EngineHTTPException(status_code=500, detail="Can't get drops")

    response = [
        data.DropperBlockchainResponse(
            blockchain=result.blockchain,
        )
        for result in results
    ]

    return response


@app.get("/claims/batch", response_model=List[data.DropBatchResponseItem])
async def get_drop_batch_handler(
    blockchain: str,
    address: str,
    limit: int = 10,
    offset: int = 0,
    db_session: Session = Depends(db.yield_db_session),
) -> List[data.DropBatchResponseItem]:
    """
    Get signed transaction for all user drops.
    """

    address = Web3.toChecksumAddress(address)

    try:
        claimant_drops = actions.get_claimant_drops(
            db_session, blockchain, address, limit, offset
        )
    except NoResultFound:
        raise EngineHTTPException(
            status_code=403, detail="You are not authorized to claim that reward"
        )
    except Exception as e:
        logger.error(e)
        raise EngineHTTPException(status_code=500, detail="Can't get claimant")

    # get claimants
    try:
        claimants = (
            db_session.query(DropperClaimant)
            .filter(
                DropperClaimant.id.in_(
                    [item.dropper_claimant_id for item in claimant_drops]
                )
            )
            .all()
        )
    except Exception as err:
        logger.error(f"Can't get claimant objects for address: {address}")
        raise EngineHTTPException(status_code=500, detail="Can't get claimant objects.")

    claimants_dict = {item.id: item for item in claimants}

    # generate list of claims

    claims: List[data.DropBatchResponseItem] = []

    commit_required = False

    for claimant_drop in claimant_drops:

        transformed_amount = claimant_drop.raw_amount

        if transformed_amount is None:

            transformed_amount = actions.transform_claim_amount(
                db_session, claimant_drop.dropper_claim_id, claimant_drop.amount
            )

        signature = claimant_drop.signature
        if signature is None or not claimant_drop.is_recent_signature:
            dropper_contract = Dropper_interface.Contract(
                BLOCKCHAIN_WEB3_PROVIDERS[blockchain],
                claimant_drop.dropper_contract_address,
            )

            message_hash_raw = dropper_contract.claimMessageHash(
                claimant_drop.claim_id,
                claimant_drop.address,
                claimant_drop.claim_block_deadline,
                int(transformed_amount),
            ).call()

            message_hash = HexBytes(message_hash_raw).hex()

            try:
                signature = signatures.DROP_SIGNER.sign_message(message_hash)
                claimants_dict[claimant_drop.dropper_claimant_id].signature = signature
                commit_required = True
            except signatures.AWSDescribeInstancesFail:
                raise EngineHTTPException(status_code=500)
            except signatures.SignWithInstanceFail:
                raise EngineHTTPException(status_code=500)
            except Exception as err:
                logger.error(f"Unexpected error in signing message process: {err}")
                raise EngineHTTPException(status_code=500)

        claims.append(
            data.DropBatchResponseItem(
                claimant=claimant_drop.address,
                amount=transformed_amount,
                amount_string=str(transformed_amount),
                claim_id=claimant_drop.claim_id,
                block_deadline=claimant_drop.claim_block_deadline,
                signature=signature,
                dropper_claim_id=claimant_drop.dropper_claim_id,
                dropper_contract_address=claimant_drop.dropper_contract_address,
                blockchain=claimant_drop.blockchain,
                active=claimant_drop.active,
                title=claimant_drop.title,
                description=claimant_drop.description,
            )
        )

    if commit_required:
        db_session.commit()

    return claims


@app.get("/claims/{dropper_claim_id}", response_model=data.DropResponse)
async def get_drop_handler(
    dropper_claim_id: UUID,
    address: str,
    db_session: Session = Depends(db.yield_db_session),
) -> data.DropResponse:
    """
    Get signed transaction for user with the given address for that claim.
    """

    address = Web3.toChecksumAddress(address)

    try:
        claimant = actions.get_claimant(db_session, dropper_claim_id, address)
    except NoResultFound:
        raise EngineHTTPException(
            status_code=403, detail="You are not authorized to claim that reward"
        )
    except Exception as e:
        raise EngineHTTPException(status_code=500, detail="Can't get claimant")

    try:
        claimant_db_object = (
            db_session.query(DropperClaimant)
            .filter(DropperClaimant.id == claimant.dropper_claimant_id)
            .one()
        )
    except Exception as err:
        logger.error(
            f"Can't get claimant object for drop: {dropper_claim_id} and address: {address}"
        )
        raise EngineHTTPException(status_code=500, detail="Can't get claimant object.")

    if not claimant.active:
        raise EngineHTTPException(
            status_code=403, detail="Cannot claim rewards for an inactive claim"
        )

    # If block deadline has already been exceeded - the contract (or frontend) will handle it.
    if claimant.claim_block_deadline is None:
        raise EngineHTTPException(
            status_code=403,
            detail="Cannot claim rewards for a claim with no block deadline",
        )

    transformed_amount = claimant.raw_amount
    if transformed_amount is None:
        transformed_amount = actions.transform_claim_amount(
            db_session, dropper_claim_id, claimant.amount
        )

    signature = claimant.signature
    if signature is None or not claimant.is_recent_signature:
        dropper_contract = Dropper_interface.Contract(
            claimant.blockchain, claimant.dropper_contract_address
        )
        message_hash_raw = dropper_contract.claimMessageHash(
            claimant.claim_id,
            claimant.address,
            claimant.claim_block_deadline,
            int(transformed_amount),
        ).call()

        message_hash = HexBytes(message_hash_raw).hex()

        try:
            signature = signatures.DROP_SIGNER.sign_message(message_hash)
            claimant_db_object.signature = signature
            db_session.commit()
        except signatures.AWSDescribeInstancesFail:
            raise EngineHTTPException(status_code=500)
        except signatures.SignWithInstanceFail:
            raise EngineHTTPException(status_code=500)
        except Exception as err:
            logger.error(f"Unexpected error in signing message process: {err}")
            raise EngineHTTPException(status_code=500)

    return data.DropResponse(
        claimant=claimant.address,
        amount=str(transformed_amount),
        claim_id=claimant.claim_id,
        block_deadline=claimant.claim_block_deadline,
        signature=signature,
        title=claimant.title,
        description=claimant.description,
    )


@app.get("/drops", response_model=data.DropListResponse)
async def get_drop_list_handler(
    blockchain: str,
    claimant_address: str,
    dropper_contract_address: Optional[str] = Query(None),
    terminus_address: Optional[str] = Query(None),
    terminus_pool_id: Optional[int] = Query(None),
    active: Optional[bool] = Query(None),
    limit: int = 20,
    offset: int = 0,
    db_session: Session = Depends(db.yield_db_session),
) -> data.DropListResponse:
    """
    Get list of drops for a given dropper contract and claimant address.
    """

    if dropper_contract_address:
        dropper_contract_address = Web3.toChecksumAddress(dropper_contract_address)

    if claimant_address:
        claimant_address = Web3.toChecksumAddress(claimant_address)

    if terminus_address:
        terminus_address = Web3.toChecksumAddress(terminus_address)

    try:
        results = actions.get_claims(
            db_session=db_session,
            dropper_contract_address=dropper_contract_address,
            blockchain=blockchain,
            claimant_address=claimant_address,
            terminus_address=terminus_address,
            terminus_pool_id=terminus_pool_id,
            active=active,
            limit=limit,
            offset=offset,
        )
    except NoResultFound:
        raise EngineHTTPException(status_code=404, detail="No drops found.")
    except Exception as e:
        logger.error(
            f"Can't get claims for user {claimant_address} end with error: {e}"
        )
        raise EngineHTTPException(status_code=500, detail="Can't get claims")

    return data.DropListResponse(drops=[result for result in results])


@app.get("/drops/contracts", response_model=List[data.DropperContractResponse])
async def get_dropper_contracts_handler(
    blockchain: Optional[str] = Query(None),
    db_session: Session = Depends(db.yield_db_session),
) -> List[data.DropperContractResponse]:
    """
    Get list of drops for a given dropper contract.
    """

    try:
        results = actions.list_dropper_contracts(
            db_session=db_session, blockchain=blockchain
        )
    except NoResultFound:
        raise EngineHTTPException(status_code=404, detail="No drops found.")
    except Exception as e:
        logger.error(f"Can't get list of dropper contracts end with error: {e}")
        raise EngineHTTPException(status_code=500, detail="Can't get contracts")

    response = [
        data.DropperContractResponse(
            id=result.id,
            blockchain=result.blockchain,
            address=result.address,
            title=result.title,
            description=result.description,
            image_uri=result.image_uri,
        )
        for result in results
    ]

    return response


@app.get("/drops/{dropper_claim_id}", response_model=data.DropperClaimResponse)
async def get_drop_handler(
    request: Request,
    dropper_claim_id: str,
    db_session: Session = Depends(db.yield_db_session),
) -> data.DropperClaimResponse:
    """
    Get drop.
    """

    try:
        drop = actions.get_drop(
            db_session=db_session, dropper_claim_id=dropper_claim_id
        )
    except NoResultFound:
        raise EngineHTTPException(status_code=404, detail="No drops found.")
    except Exception as e:
        logger.error(f"Can't get drop {dropper_claim_id} end with error: {e}")
        raise EngineHTTPException(status_code=500, detail="Can't get drop")

    return data.DropperClaimResponse(
        id=drop.id,
        dropper_contract_id=drop.dropper_contract_id,
        title=drop.title,
        description=drop.description,
        active=drop.active,
        claim_block_deadline=drop.claim_block_deadline,
        terminus_address=drop.terminus_address,
        terminus_pool_id=drop.terminus_pool_id,
        claim_id=drop.claim_id,
    )


@app.get("/terminus")
async def get_drops_terminus_handler(
    blockchain: str = Query(None),
    db_session: Session = Depends(db.yield_db_session),
) -> List[data.DropperTerminusResponse]:

    """
    Return distinct terminus pools
    """

    try:
        results = actions.list_drops_terminus(
            db_session=db_session, blockchain=blockchain
        )
    except Exception as e:
        logger.error(f"Can't get list of terminus contracts end with error: {e}")
        raise EngineHTTPException(
            status_code=500, detail="Can't get terminus contracts"
        )

    response = [
        data.DropperTerminusResponse(
            terminus_address=result.terminus_address,
            terminus_pool_id=result.terminus_pool_id,
            blockchain=result.blockchain,
        )
        for result in results
    ]

    return response