"""Authenticated, project-scoped node removal and restore routes."""

from collections.abc import Callable
from typing import Annotated, Literal

from fastapi import Cookie, Depends, FastAPI, Header, HTTPException, Request, Response
from pydantic import BaseModel, ConfigDict

from gewu.adapters.sqlite_node_removals import NodeRemoval, RemovalConflict, SQLiteNodeRemovalStore
from gewu.application.identity import Principal
from gewu.application.reading import CanonicalNodeReader, ReadError
from gewu.domain.contracts import RecordId


class NodeRemovalRequest(BaseModel):
    model_config = ConfigDict(extra="forbid", strict=True)
    confirmed: Literal[True]


class NodeRemovalItem(BaseModel):
    removal_id: str
    project_id: str
    node_id: str
    title: str
    requested_at: str
    restore_until: str

    @classmethod
    def from_record(cls, record: NodeRemoval) -> "NodeRemovalItem":
        return cls(
            removal_id=record.removal_id,
            project_id=record.project_id,
            node_id=record.node_id,
            title=record.title,
            requested_at=record.requested_at,
            restore_until=record.restore_until,
        )


class NodeRemovalList(BaseModel):
    can_manage: bool
    removals: list[NodeRemovalItem]


def register_node_removal_routes(
    app: FastAPI,
    store: SQLiteNodeRemovalStore,
    reader: CanonicalNodeReader,
    authenticate: Callable[..., Principal],
    require_same_origin: Callable[[Request], None],
) -> None:
    def human(
        request: Request,
        response: Response,
        authorization: str | None = Header(default=None),
        session_cookie: str | None = Cookie(default=None, alias="gewu_session"),
        csrf_token: str | None = Header(default=None, alias="X-GEWU-CSRF"),
    ) -> Principal:
        response.headers["Cache-Control"] = "private, no-store"
        write = request.method not in {"GET", "HEAD"}
        if write:
            require_same_origin(request)
        principal = authenticate(authorization, session_cookie, csrf_token, require_csrf=write)
        if "agent" in principal.roles:
            raise HTTPException(403, "A human account is required")
        return principal

    def require_manager(principal: Principal, project_id: str) -> None:
        if not principal.can_read_project(project_id):
            raise HTTPException(404, "Project removal queue is unavailable")
        if not ({"editor", "admin", "owner"} & principal.roles):
            raise HTTPException(403, "Editor role is required to remove or restore knowledge")

    @app.get(
        "/v1/projects/{project_id}/node-removals",
        response_model=NodeRemovalList,
        tags=["knowledge"],
        operation_id="node_removal_list",
    )
    def list_removals(
        project_id: RecordId,
        principal: Annotated[Principal, Depends(human)],
    ) -> NodeRemovalList:
        if not principal.can_read_project(project_id):
            raise HTTPException(404, "Project removal queue is unavailable")
        can_manage = bool({"editor", "admin", "owner"} & principal.roles)
        removals = store.list_restorable(project_id) if can_manage else ()
        return NodeRemovalList(
            can_manage=can_manage,
            removals=[NodeRemovalItem.from_record(record) for record in removals],
        )

    @app.post(
        "/v1/projects/{project_id}/nodes/{node_id}/removal",
        response_model=NodeRemovalItem,
        status_code=201,
        tags=["knowledge"],
        operation_id="node_removal_request",
    )
    def request_removal(
        project_id: RecordId,
        node_id: RecordId,
        body: NodeRemovalRequest,
        principal: Annotated[Principal, Depends(human)],
    ) -> NodeRemovalItem:
        require_manager(principal, project_id)
        try:
            envelope = reader.get_node(project_id, node_id, principal=principal)
            title = str(envelope.data[0]["title"])
            return NodeRemovalItem.from_record(
                store.request(project_id, node_id, title, principal.principal_id)
            )
        except ReadError as error:
            raise HTTPException(status_code=error.status_code, detail=str(error)) from error
        except RemovalConflict as error:
            raise HTTPException(status_code=409, detail=str(error)) from error
        except RuntimeError as error:
            raise HTTPException(status_code=503, detail=str(error)) from error

    @app.post(
        "/v1/projects/{project_id}/nodes/{node_id}/restore-removal",
        response_model=NodeRemovalItem,
        tags=["knowledge"],
        operation_id="node_removal_restore",
    )
    def restore_removal(
        project_id: RecordId,
        node_id: RecordId,
        principal: Annotated[Principal, Depends(human)],
    ) -> NodeRemovalItem:
        require_manager(principal, project_id)
        try:
            return NodeRemovalItem.from_record(
                store.restore(project_id, node_id, principal.principal_id)
            )
        except KeyError as error:
            raise HTTPException(status_code=404, detail="Removed node was not found") from error
        except RemovalConflict as error:
            raise HTTPException(status_code=410, detail=str(error)) from error
        except RuntimeError as error:
            raise HTTPException(status_code=503, detail=str(error)) from error