from uuid import UUID

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

from app.auth.dependencies import get_current_active_user
from app.db import get_db_session
from app.encryption import encrypt_value
from app.models.project import Project
from app.models.secret import Secret
from app.models.tool_instance import ToolInstance
from app.models.user import User
from app.schemas.secret import SecretCreate, SecretRead, SecretUpdate

router = APIRouter(tags=["secrets"])


async def _verify_secret_ownership(
    secret_obj: Secret, user: User, session: AsyncSession
) -> None:
    if secret_obj.scope_type == "user":
        if secret_obj.scope_id != user.id:
            raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Access denied")
    elif secret_obj.scope_type == "project":
        project = await session.get(Project, secret_obj.scope_id)
        if not project or project.owner_id != user.id:
            raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Access denied")
    elif secret_obj.scope_type == "tool_instance":
        ti = await session.get(ToolInstance, secret_obj.scope_id)
        if not ti:
            raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Access denied")
        project = await session.get(Project, ti.project_id)
        if not project or project.owner_id != user.id:
            raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Access denied")
    elif secret_obj.scope_type == "global":
        pass
    else:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Invalid scope_type")


@router.post("/secrets", response_model=SecretRead, status_code=status.HTTP_201_CREATED)
async def create_secret(
    secret_in: SecretCreate,
    current_user: User = Depends(get_current_active_user),
    session: AsyncSession = Depends(get_db_session),
) -> SecretRead:
    secret = Secret(
        scope_type=secret_in.scope_type,
        scope_id=secret_in.scope_id,
        key=secret_in.key,
        encrypted_value=encrypt_value(secret_in.value),
    )
    await _verify_secret_ownership(secret, current_user, session)
    session.add(secret)
    await session.commit()
    await session.refresh(secret)
    return SecretRead.from_secret(secret)


@router.get("/secrets", response_model=list[SecretRead])
async def list_secrets(
    scope_type: str | None = None,
    scope_id: UUID | None = None,
    current_user: User = Depends(get_current_active_user),
    session: AsyncSession = Depends(get_db_session),
) -> list[SecretRead]:
    stmt = select(Secret)
    if scope_type:
        stmt = stmt.where(Secret.scope_type == scope_type)
    if scope_id:
        stmt = stmt.where(Secret.scope_id == scope_id)
    result = await session.execute(stmt)
    secrets = list(result.scalars().all())
    allowed = []
    for s in secrets:
        try:
            await _verify_secret_ownership(s, current_user, session)
            allowed.append(SecretRead.from_secret(s))
        except HTTPException:
            pass
    return allowed


@router.get("/secrets/{secret_id}", response_model=SecretRead)
async def get_secret(
    secret_id: UUID,
    current_user: User = Depends(get_current_active_user),
    session: AsyncSession = Depends(get_db_session),
) -> SecretRead:
    s = await session.get(Secret, secret_id)
    if not s:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Secret not found")
    await _verify_secret_ownership(s, current_user, session)
    return SecretRead.from_secret(s)


@router.put("/secrets/{secret_id}", response_model=SecretRead)
async def update_secret(
    secret_id: UUID,
    secret_in: SecretUpdate,
    current_user: User = Depends(get_current_active_user),
    session: AsyncSession = Depends(get_db_session),
) -> SecretRead:
    s = await session.get(Secret, secret_id)
    if not s:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Secret not found")
    await _verify_secret_ownership(s, current_user, session)
    if secret_in.key is not None:
        s.key = secret_in.key
    if secret_in.value is not None:
        s.encrypted_value = encrypt_value(secret_in.value)
    await session.commit()
    await session.refresh(s)
    return SecretRead.from_secret(s)


@router.delete("/secrets/{secret_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_secret(
    secret_id: UUID,
    current_user: User = Depends(get_current_active_user),
    session: AsyncSession = Depends(get_db_session),
) -> None:
    s = await session.get(Secret, secret_id)
    if not s:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Secret not found")
    await _verify_secret_ownership(s, current_user, session)
    await session.delete(s)
    await session.commit()