from uuid import UUID

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

from app.core.config import Settings
from app.core.deps import get_app_settings, get_db
from app.models.challenge import Challenge
from app.schemas.api import (
    ChallengeApprovalRequest,
    ChallengeCreateRequest,
    ChallengeOut,
    DenyRequest,
    EnrollmentFinishRequest,
    EnrollmentFinishResponse,
    EnrollmentStartRequest,
    EnrollmentStartResponse,
)
from app.services.challenges import approve_challenge, create_challenge, deny_challenge, expire_if_needed
from app.services.enrollment import finish_enrollment, start_enrollment
from app.services.push import PushService

router = APIRouter(prefix="/api", tags=["api"])


@router.post("/enroll/start", response_model=EnrollmentStartResponse)
async def enroll_start(
    body: EnrollmentStartRequest,
    request: Request,
    session: AsyncSession = Depends(get_db),
    settings: Settings = Depends(get_app_settings),
):
    enrollment, qr_payload, qr_b64 = await start_enrollment(
        session,
        settings,
        username=body.username,
        display_name=body.display_name,
        email=body.email,
        ip_address=request.client.host if request.client else None,
    )
    await session.commit()
    return EnrollmentStartResponse(
        enrollment_id=enrollment.id,
        qr_payload=qr_payload,
        qr_png_base64=qr_b64,
        expires_at=enrollment.expires_at,
    )


@router.post("/enroll/finish", response_model=EnrollmentFinishResponse)
async def enroll_finish(
    body: EnrollmentFinishRequest,
    request: Request,
    session: AsyncSession = Depends(get_db),
):
    device = await finish_enrollment(
        session,
        enrollment_token=body.enrollment_token,
        device_name=body.device_name,
        public_key_pem=body.public_key_pem,
        public_key_alg=body.public_key_alg,
        fcm_token=body.fcm_token,
        app_version=body.app_version,
        attestation=body.attestation,
        ip_address=request.client.host if request.client else None,
    )
    if not device:
        raise HTTPException(status_code=400, detail="Invalid or expired enrollment")
    await session.commit()
    return EnrollmentFinishResponse(device_id=device.id, user_id=device.user_id)


@router.post("/challenges", response_model=ChallengeOut)
async def challenges_create(
    body: ChallengeCreateRequest,
    session: AsyncSession = Depends(get_db),
    settings: Settings = Depends(get_app_settings),
):
    challenge = await create_challenge(
        session,
        settings,
        PushService(settings),
        username=body.username,
        relying_party=body.relying_party,
        requester_ip=body.requester_ip,
        location=body.location,
        ttl_seconds=body.ttl_seconds,
        oidc_state=body.oidc_state,
    )
    if not challenge:
        raise HTTPException(status_code=404, detail="No active enrolled device for user")
    await session.commit()
    return challenge


@router.get("/challenges/{challenge_id}", response_model=ChallengeOut)
async def challenges_get(challenge_id: UUID, session: AsyncSession = Depends(get_db)):
    challenge = await session.get(Challenge, challenge_id)
    if not challenge:
        raise HTTPException(status_code=404, detail="Challenge not found")
    await expire_if_needed(session, challenge)
    await session.commit()
    return challenge


@router.post("/challenges/{challenge_id}/approve")
async def challenges_approve(
    challenge_id: UUID,
    body: ChallengeApprovalRequest,
    request: Request,
    session: AsyncSession = Depends(get_db),
):
    challenge = await session.get(Challenge, challenge_id)
    if not challenge:
        raise HTTPException(status_code=404, detail="Challenge not found")
    ok, reason = await approve_challenge(
        session,
        challenge=challenge,
        device_id=body.device_id,
        payload=body.payload,
        signature=body.signature,
        ip_address=request.client.host if request.client else None,
    )
    await session.commit()
    if not ok:
        raise HTTPException(status_code=400, detail=reason)
    return {"status": "approved"}


@router.post("/challenges/{challenge_id}/deny")
async def challenges_deny(
    challenge_id: UUID,
    body: DenyRequest,
    request: Request,
    session: AsyncSession = Depends(get_db),
):
    challenge = await session.get(Challenge, challenge_id)
    if not challenge:
        raise HTTPException(status_code=404, detail="Challenge not found")
    ok, reason = await deny_challenge(
        session,
        challenge=challenge,
        device_id=body.device_id,
        reason=body.reason,
        ip_address=request.client.host if request.client else None,
    )
    await session.commit()
    if not ok:
        raise HTTPException(status_code=400, detail=reason)
    return {"status": "denied"}