from __future__ import annotations

from uuid import UUID

from fastapi import APIRouter, Depends, Header, HTTPException, Request, status
from jsonschema import ValidationError

from hub_core.runtime.models import (
    EventCommand,
    MessageCommand,
    PortAccepted,
    PortCollection,
    PortRecord,
    RegistryRegistration,
)
from hub_core.runtime.store import PortStore
from hub_core.runtime.validation import ContractValidator


def get_port_store(request: Request) -> PortStore:
    return request.app.state.port_store


def get_contract_validator(request: Request) -> ContractValidator:
    return request.app.state.contract_validator


def _attribute_event(body: EventCommand, request: Request) -> EventCommand:
    context = getattr(request.state, "hub_access", None)
    if context is None:
        return body
    # Reserved server provenance overrides any payload assertion. Domain
    # subject_refs remain business data and are never authentication evidence.
    return body.model_copy(update={"payload": {**body.payload, "_hub_access": {
        "issuer": context.actor.issuer, "subject": context.actor.subject,
        "principal_type": context.actor.principal_type,
        "actor_tenant": context.actor.tenant,
        "target_tenant": context.facts.target_tenant,
        "correlation_id": context.correlation_id,
    }}})


def create_ports_router() -> APIRouter:
    router = APIRouter(prefix="/ports")

    @router.post(
        "/registry/registrations",
        response_model=PortAccepted,
        status_code=status.HTTP_202_ACCEPTED,
        tags=["registry"],
        openapi_extra={"x-port-id": "port.registry", "x-direction": "in"},
    )
    async def register_extension(
        body: RegistryRegistration,
        x_correlation_id: UUID = Header(alias="X-Correlation-ID"),
        store: PortStore = Depends(get_port_store),
        validator: ContractValidator = Depends(get_contract_validator),
    ) -> PortAccepted:
        try:
            validator.validate_registration(body)
        except (ValidationError, ValueError) as exc:
            raise HTTPException(status_code=422, detail=str(exc)) from exc
        return await store.register_extension(body, x_correlation_id)

    @router.get(
        "/registry/registrations/{hub_slug}",
        response_model=PortRecord,
        tags=["registry"],
        openapi_extra={"x-port-id": "port.registry", "x-direction": "out"},
    )
    async def resolve_registration(
        hub_slug: str,
        store: PortStore = Depends(get_port_store),
    ) -> PortRecord:
        resolved = await store.resolve_registration(hub_slug)
        if resolved is None:
            raise HTTPException(status_code=404, detail=f"Registration '{hub_slug}' not found")
        return resolved

    @router.get(
        "/registry/registrations/{hub_slug}/audit",
        response_model=PortCollection,
        tags=["registry"],
        openapi_extra={"x-port-id": "port.registry", "x-direction": "out"},
    )
    async def registration_audit(
        hub_slug: str,
        store: PortStore = Depends(get_port_store),
    ) -> PortCollection:
        audit = await store.list_registration_audit(hub_slug)
        if not audit.items:
            raise HTTPException(status_code=404, detail=f"No audit history for '{hub_slug}'")
        return audit

    @router.get(
        "/messaging/messages",
        response_model=PortCollection,
        tags=["messaging"],
        openapi_extra={"x-port-id": "port.messaging", "x-direction": "out"},
    )
    async def list_messages(
        address: str,
        conversation_id: UUID | None = None,
        store: PortStore = Depends(get_port_store),
    ) -> PortCollection:
        return await store.list_messages(address, conversation_id)

    @router.post(
        "/messaging/messages",
        response_model=PortAccepted,
        status_code=status.HTTP_202_ACCEPTED,
        tags=["messaging"],
        openapi_extra={"x-port-id": "port.messaging", "x-direction": "in"},
    )
    async def send_message(
        body: MessageCommand,
        store: PortStore = Depends(get_port_store),
    ) -> PortAccepted:
        return await store.send_message(body)

    @router.post(
        "/events/progress",
        response_model=PortAccepted,
        status_code=status.HTTP_202_ACCEPTED,
        tags=["events"],
        openapi_extra={"x-port-id": "port.events.progress", "x-direction": "in"},
    )
    async def append_progress(
        body: EventCommand,
        request: Request,
        store: PortStore = Depends(get_port_store),
        validator: ContractValidator = Depends(get_contract_validator),
    ) -> PortAccepted:
        try:
            validator.validate_event_family(body.event_type, "progress")
        except ValueError as exc:
            raise HTTPException(status_code=422, detail=str(exc)) from exc
        return await store.append_progress(_attribute_event(body, request))

    @router.post(
        "/events/interaction",
        response_model=PortAccepted,
        status_code=status.HTTP_202_ACCEPTED,
        tags=["events"],
        openapi_extra={"x-port-id": "port.events.interaction", "x-direction": "in"},
    )
    async def append_interaction(
        body: EventCommand,
        request: Request,
        store: PortStore = Depends(get_port_store),
        validator: ContractValidator = Depends(get_contract_validator),
    ) -> PortAccepted:
        try:
            validator.validate_event_family(body.event_type, "interaction")
        except ValueError as exc:
            raise HTTPException(status_code=422, detail=str(exc)) from exc
        return await store.append_interaction(_attribute_event(body, request))

    @router.get(
        "/projections/{projection_id}",
        response_model=PortRecord,
        tags=["projections"],
        openapi_extra={"x-port-id": "port.projection.query", "x-direction": "out"},
    )
    async def query_projection(
        projection_id: str,
        store: PortStore = Depends(get_port_store),
    ) -> PortRecord:
        projection = await store.query_projection(projection_id)
        if projection is None:
            raise HTTPException(status_code=404, detail=f"Projection '{projection_id}' not found")
        return projection

    return router