from __future__ import annotations

import json
import logging
from typing import override

from flask import Response
from flask_restx import Resource
from sqlalchemy.orm import Session
from werkzeug.exceptions import BadRequest

from controllers.common.human_input import HumanInputFormSubmitPayload, stringify_form_default_values
from controllers.common.rbac import PlainApp, RBACCheck, RBACPermission
from controllers.common.schema import register_schema_models
from controllers.openapi import openapi_ns
from controllers.openapi._contract import endpoint
from controllers.openapi._errors import HumanInputFormNotFound, RecipientSurfaceMismatch
from controllers.openapi._models import FormSubmitResponse, HumanInputFormDefinitionResponse
from controllers.openapi.auth.context import Context
from controllers.openapi.auth.loaders import PathParam, load_app
from controllers.openapi.auth.requirements import (
    CheckAppAccess,
    CheckAppApiEnabled,
    CheckRBACPermission,
    CheckScope,
    CheckSubject,
    CheckWorkspaceMember,
    Requirement,
)
from controllers.openapi.auth.subjects import AccountSubject, ExternalSsoSubject, ResourceAccessSubject, Subject
from core.db.session_factory import session_factory
from core.workflow.human_input_policy import HumanInputSurface, is_recipient_type_allowed_for_surface
from extensions.ext_database import db
from libs.helper import to_timestamp
from libs.oauth_bearer import Scope
from models.enums import CreatorUserRole
from models.model import App
from services.human_input_service import FormNotFoundError, HumanInputService

logger = logging.getLogger(__name__)

register_schema_models(openapi_ns, HumanInputFormSubmitPayload)


class CheckFormSurface(Requirement):
    """`/openapi/v1` is allowed only the recipient types `human_input_policy` lists
    for it, so a console-bound form is refused before any handler body runs. It
    lives here rather than in `auth/requirements.py` so the auth layer never has
    to import this feature's domain.

    A form the caller could not have found anyway — missing, or belonging to
    another app — is left to the handler's own 404: answering 403 here would tell
    an outsider the form token exists.
    """

    @override
    def run(self, subject: Subject, ctx: Context, session: Session) -> None:
        form_token = ctx.view_args[PathParam.FORM_TOKEN]
        app = load_app(ctx)
        # `HumanInputService` takes an engine or a maker, never a `Session`, so this
        # read is a separate transaction from the handler's — as it was before the move.
        form = HumanInputService(session_factory.get_session_maker()).get_form_by_token(form_token)
        if form is None or form.app_id != app.id or form.tenant_id != app.tenant_id:
            return
        if not is_recipient_type_allowed_for_surface(form.recipient_type, HumanInputSurface.OPENAPI):
            raise RecipientSurfaceMismatch()


def _jsonify_form_definition(form) -> Response:
    definition_payload = form.get_definition().model_dump()
    payload = {
        "form_content": definition_payload["rendered_content"],
        "inputs": definition_payload["inputs"],
        "resolved_default_values": stringify_form_default_values(definition_payload["default_values"]),
        "user_actions": definition_payload["user_actions"],
        "expiration_time": to_timestamp(form.expiration_time),
    }
    return Response(json.dumps(payload, ensure_ascii=False), mimetype="application/json")


def _ensure_form_belongs_to_app(form, app_model: App) -> None:
    if form.app_id != app_model.id or form.tenant_id != app_model.tenant_id:
        raise HumanInputFormNotFound()


@openapi_ns.route("/apps/<string:app_id>/human-input-forms/<string:form_token>")
class OpenApiWorkflowHumanInputFormApi(Resource):
    @endpoint(
        requirements=(
            CheckSubject(allowed=(AccountSubject, ExternalSsoSubject, ResourceAccessSubject)),
            CheckAppApiEnabled(),
            CheckWorkspaceMember(),
            CheckScope(Scope.APPS_RUN),
            CheckRBACPermission(RBACCheck(RBACPermission.APP_TEST_AND_RUN, PlainApp())),
            CheckAppAccess(),
            CheckFormSurface(),
        ),
        returns=(200, HumanInputFormDefinitionResponse, "Form definition"),
    )
    def get(self, ctx: Context, app_id: str, form_token: str):
        service = HumanInputService(db.engine)
        form = service.get_form_by_token(form_token)
        if form is None:
            raise HumanInputFormNotFound()

        _ensure_form_belongs_to_app(form, ctx.app)
        service.ensure_form_active(form)
        return _jsonify_form_definition(form)


@openapi_ns.route("/apps/<string:app_id>/human-input-forms/<string:form_token>:submit")
class OpenApiWorkflowHumanInputFormSubmitApi(Resource):
    @endpoint(
        requirements=(
            CheckSubject(allowed=(AccountSubject, ExternalSsoSubject, ResourceAccessSubject)),
            CheckAppApiEnabled(),
            CheckWorkspaceMember(),
            CheckScope(Scope.APPS_RUN),
            CheckRBACPermission(RBACCheck(RBACPermission.APP_TEST_AND_RUN, PlainApp())),
            CheckAppAccess(),
            CheckFormSurface(),
        ),
        body=HumanInputFormSubmitPayload,
        returns=(200, FormSubmitResponse, "Form submitted"),
    )
    def post(self, ctx: Context, app_id: str, form_token: str, *, body: HumanInputFormSubmitPayload):
        service = HumanInputService(db.engine)
        form = service.get_form_by_token(form_token)
        if form is None:
            raise HumanInputFormNotFound()

        _ensure_form_belongs_to_app(form, ctx.app)

        submission_user_id: str | None = None
        submission_end_user_id: str | None = None
        if ctx.subject.caller_role is CreatorUserRole.ACCOUNT:
            submission_user_id = ctx.account.id
        else:
            submission_end_user_id = ctx.end_user.id

        if form.recipient_type is None:
            logger.warning("Recipient type is None for form, form_token=%s", form_token)
            raise BadRequest("Form recipient type is invalid")

        try:
            service.submit_form_by_token(
                recipient_type=form.recipient_type,
                form_token=form_token,
                selected_action_id=body.action,
                form_data=body.inputs,
                submission_user_id=submission_user_id,
                submission_end_user_id=submission_end_user_id,
            )
        except FormNotFoundError:
            raise HumanInputFormNotFound()

        return FormSubmitResponse()