import io
import json
import os
import time
from typing import Any

from flask import current_app
from flask.testing import FlaskClient
from spiffworkflow_backend.exceptions.api_error import ApiError
from spiffworkflow_backend.models.db import db
from spiffworkflow_backend.models.message_instance import MessageInstanceModel
from spiffworkflow_backend.models.permission_assignment import Permission
from spiffworkflow_backend.models.permission_target import PermissionTargetModel
from spiffworkflow_backend.models.process_group import ProcessGroup
from spiffworkflow_backend.models.process_group import ProcessGroupSchema
from spiffworkflow_backend.models.process_instance import ProcessInstanceModel
from spiffworkflow_backend.models.process_instance_report import ReportMetadata
from spiffworkflow_backend.models.process_model import NotificationType
from spiffworkflow_backend.models.process_model import ProcessModelInfo
from spiffworkflow_backend.models.process_model import ProcessModelInfoSchema
from spiffworkflow_backend.models.user import UserModel
from spiffworkflow_backend.services.authorization_service import AuthorizationService
from spiffworkflow_backend.services.file_system_service import FileSystemService
from spiffworkflow_backend.services.process_instance_processor import ProcessInstanceProcessor
from spiffworkflow_backend.services.process_instance_queue_service import ProcessInstanceQueueService
from spiffworkflow_backend.services.process_instance_service import ProcessInstanceService
from spiffworkflow_backend.services.process_model_service import ProcessModelService
from spiffworkflow_backend.services.user_service import UserService
from werkzeug.test import TestResponse  # type: ignore

from tests.spiffworkflow_backend.helpers.test_data import load_test_spec

# from tests.spiffworkflow_backend.helpers.test_data import logged_in_headers


class BaseTest:
    @staticmethod
    def find_or_create_user(username: str = "test_user_1") -> UserModel:
        user = UserModel.query.filter_by(username=username).first()
        if isinstance(user, UserModel):
            return user

        user = UserService.create_user(username, "internal", username)
        if isinstance(user, UserModel):
            return user

        raise ApiError(
            error_code="create_user_error",
            message=f"Cannot find or create user: {username}",
        )

    @staticmethod
    def logged_in_headers(user: UserModel, _redirect_url: str = "http://some/frontend/url") -> dict[str, str]:
        return {"Authorization": "Bearer " + user.encode_auth_token()}

    def create_group_and_model_with_bpmn(
        self,
        client: FlaskClient,
        user: UserModel,
        process_group_id: str | None = "test_group",
        process_model_id: str | None = "random_fact",
        bpmn_file_name: str | None = None,
        bpmn_file_location: str | None = None,
    ) -> str:
        """Creates a process group.

        Creates a process model
        Adds a bpmn file to the model.
        """
        process_group_display_name = process_group_id or ""
        process_group_description = process_group_id or ""
        process_model_identifier = f"{process_group_id}/{process_model_id}"
        if bpmn_file_location is None:
            bpmn_file_location = process_model_id

        self.create_process_group_with_api(client, user, process_group_description, process_group_display_name)

        self.create_process_model_with_api(
            client,
            process_model_id=process_model_identifier,
            process_model_display_name=process_group_display_name,
            process_model_description=process_group_description,
            user=user,
        )

        load_test_spec(
            process_model_id=process_model_identifier,
            bpmn_file_name=bpmn_file_name,
            process_model_source_directory=bpmn_file_location,
        )

        return process_model_identifier

    def create_process_group(
        self,
        process_group_id: str,
        display_name: str = "",
    ) -> ProcessGroup:
        process_group = ProcessGroup(id=process_group_id, display_name=display_name, display_order=0, admin=False)
        return ProcessModelService.add_process_group(process_group)

    def create_process_group_with_api(
        self,
        client: FlaskClient,
        user: Any,
        process_group_id: str,
        display_name: str = "",
    ) -> str:
        process_group = ProcessGroup(id=process_group_id, display_name=display_name, display_order=0, admin=False)
        response = client.post(
            "/v1.0/process-groups",
            headers=self.logged_in_headers(user),
            content_type="application/json",
            data=json.dumps(ProcessGroupSchema().dump(process_group)),
        )
        assert response.status_code == 201
        assert response.json is not None
        assert response.json["id"] == process_group_id
        return process_group_id

    def create_process_model_with_api(
        self,
        client: FlaskClient,
        process_model_id: str | None = None,
        process_model_display_name: str = "Cooooookies",
        process_model_description: str = "Om nom nom delicious cookies",
        fault_or_suspend_on_exception: str = NotificationType.suspend.value,
        exception_notification_addresses: list | None = None,
        primary_process_id: str | None = None,
        primary_file_name: str | None = None,
        user: UserModel | None = None,
    ) -> TestResponse:
        if process_model_id is not None:
            # make sure we have a group
            process_group_id, _ = os.path.split(process_model_id)
            modified_process_group_id = process_group_id.replace("/", ":")
            process_group_path = os.path.abspath(os.path.join(FileSystemService.root_path(), process_group_id))
            if ProcessModelService.is_process_group(process_group_path):
                if exception_notification_addresses is None:
                    exception_notification_addresses = []

                model = ProcessModelInfo(
                    id=process_model_id,
                    display_name=process_model_display_name,
                    description=process_model_description,
                    primary_process_id=primary_process_id,
                    primary_file_name=primary_file_name,
                    fault_or_suspend_on_exception=fault_or_suspend_on_exception,
                    exception_notification_addresses=exception_notification_addresses,
                )
                if user is None:
                    user = self.find_or_create_user()

                response = client.post(
                    f"/v1.0/process-models/{modified_process_group_id}",
                    content_type="application/json",
                    data=json.dumps(ProcessModelInfoSchema().dump(model)),
                    headers=self.logged_in_headers(user),
                )

                assert response.status_code == 201
                return response

            else:
                raise Exception("You must create the group first")
        else:
            raise Exception("You must include the process_model_id, which must be a path to the model")

    def get_test_data_file_full_path(self, file_name: str, process_model_test_data_dir: str) -> str:
        return os.path.join(
            current_app.instance_path,
            "..",
            "..",
            "tests",
            "data",
            process_model_test_data_dir,
            file_name,
        )

    def get_test_data_file_contents(self, file_name: str, process_model_test_data_dir: str) -> bytes:
        file_full_path = self.get_test_data_file_full_path(file_name, process_model_test_data_dir)
        with open(file_full_path, "rb") as file:
            return file.read()

    def create_spec_file(
        self,
        client: FlaskClient,
        process_model_id: str,
        process_model_location: str | None = None,
        process_model: ProcessModelInfo | None = None,
        file_name: str = "random_fact.svg",
        file_data: bytes = b"abcdef",
        user: UserModel | None = None,
    ) -> Any:
        """Test_create_spec_file.

        Adds a bpmn file to the model.
        process_model_id is the destination path
        process_model_location is the source path

        because of permissions, user might be required now..., not sure yet.
        """
        if process_model_location is None:
            process_model_location = file_name.split(".")[0]
        if process_model is None:
            process_model = load_test_spec(
                process_model_id=process_model_id,
                bpmn_file_name=file_name,
                process_model_source_directory=process_model_location,
            )
        data = {"file": (io.BytesIO(file_data), file_name)}
        if user is None:
            user = self.find_or_create_user()
        modified_process_model_id = process_model.id.replace("/", ":")
        response = client.post(
            f"/v1.0/process-models/{modified_process_model_id}/files",
            data=data,
            follow_redirects=True,
            content_type="multipart/form-data",
            headers=self.logged_in_headers(user),
        )
        assert response.status_code == 201
        assert response.get_data() is not None
        file = json.loads(response.get_data(as_text=True))
        # assert FileType.svg.value == file["type"]
        # assert "image/svg+xml" == file["content_type"]

        response = client.get(
            f"/v1.0/process-models/{modified_process_model_id}/files/{file_name}",
            headers=self.logged_in_headers(user),
        )
        assert response.status_code == 200
        file2 = json.loads(response.get_data(as_text=True))
        assert file["file_contents"] == file2["file_contents"]
        return file

    @staticmethod
    def create_process_instance_from_process_model_id_with_api(
        client: FlaskClient,
        test_process_model_id: str,
        headers: dict[str, str],
    ) -> TestResponse:
        """Create_process_instance.

        There must be an existing process model to instantiate.
        """
        if not ProcessModelService.is_process_model_identifier(test_process_model_id):
            dirname = os.path.dirname(test_process_model_id)
            if not ProcessModelService.is_process_group_identifier(dirname):
                process_group = ProcessGroup(id=dirname, display_name=dirname)
                ProcessModelService.add_process_group(process_group)
            basename = os.path.basename(test_process_model_id)
            load_test_spec(
                process_model_id=test_process_model_id,
                process_model_source_directory=basename,
                bpmn_file_name=basename,
            )
        modified_process_model_id = test_process_model_id.replace("/", ":")
        response = client.post(
            f"/v1.0/process-instances/{modified_process_model_id}",
            headers=headers,
        )
        assert response.status_code == 201
        return response

    # @staticmethod
    # def get_public_access_token(username: str, password: str) -> dict:
    #     """Get_public_access_token."""
    #     public_access_token = AuthenticationService().get_public_access_token(
    #         username, password
    #     )
    #     return public_access_token

    def create_process_instance_from_process_model(
        self,
        process_model: ProcessModelInfo,
        status: str | None = "not_started",
        user: UserModel | None = None,
    ) -> ProcessInstanceModel:
        if user is None:
            user = self.find_or_create_user()

        current_time = round(time.time())
        process_instance = ProcessInstanceModel(
            status=status,
            process_initiator=user,
            process_model_identifier=process_model.id,
            process_model_display_name=process_model.display_name,
            updated_at_in_seconds=round(time.time()),
            start_in_seconds=current_time - (3600 * 1),
            end_in_seconds=current_time - (3600 * 1 - 20),
        )
        db.session.add(process_instance)
        db.session.commit()

        run_at_in_seconds = round(time.time())
        ProcessInstanceQueueService.enqueue_new_process_instance(process_instance, run_at_in_seconds)

        return process_instance

    @classmethod
    def create_user_with_permission(
        cls,
        username: str,
        target_uri: str = PermissionTargetModel.URI_ALL,
        permission_names: list[str] | None = None,
    ) -> UserModel:
        user = BaseTest.find_or_create_user(username=username)
        return cls.add_permissions_to_user(user, target_uri=target_uri, permission_names=permission_names)

    @classmethod
    def add_permissions_to_user(
        cls,
        user: UserModel,
        target_uri: str = PermissionTargetModel.URI_ALL,
        permission_names: list[str] | None = None,
    ) -> UserModel:
        permission_target = AuthorizationService.find_or_create_permission_target(target_uri)

        if permission_names is None:
            permission_names = [member.name for member in Permission]

        for permission in permission_names:
            AuthorizationService.create_permission_for_principal(
                principal=user.principal,
                permission_target=permission_target,
                permission=permission,
            )
        return user

    def assert_user_has_permission(
        self,
        user: UserModel,
        permission: str,
        target_uri: str,
        expected_result: bool = True,
    ) -> None:
        has_permission = AuthorizationService.user_has_permission(
            user=user,
            permission=permission,
            target_uri=target_uri,
        )
        assert has_permission is expected_result

    def modify_process_identifier_for_path_param(self, identifier: str) -> str:
        return ProcessModelInfo.modify_process_identifier_for_path_param(identifier)

    def un_modify_modified_process_identifier_for_path_param(self, modified_identifier: str) -> str:
        return modified_identifier.replace(":", "/")

    def create_process_model_with_metadata(self) -> ProcessModelInfo:
        self.create_process_group("test_group", "test_group")
        process_model = load_test_spec(
            "test_group/hello_world",
            process_model_source_directory="nested-task-data-structure",
        )
        ProcessModelService.update_process_model(
            process_model,
            {
                "metadata_extraction_paths": [
                    {"key": "awesome_var", "path": "outer.inner"},
                    {"key": "invoice_number", "path": "invoice_number"},
                ]
            },
        )
        return process_model

    def post_to_process_instance_list(
        self,
        client: FlaskClient,
        user: UserModel,
        report_metadata: ReportMetadata | None = None,
        param_string: str | None = "",
    ) -> TestResponse:
        report_metadata_to_use = report_metadata
        if report_metadata_to_use is None:
            report_metadata_to_use = self.empty_report_metadata_body()
        response = client.post(
            f"/v1.0/process-instances{param_string}",
            headers=self.logged_in_headers(user),
            content_type="application/json",
            data=json.dumps({"report_metadata": report_metadata_to_use}),
        )
        assert response.status_code == 200
        assert response.json is not None
        return response

    def empty_report_metadata_body(self) -> ReportMetadata:
        return {"filter_by": [], "columns": [], "order_by": []}

    def start_sender_process(
        self,
        client: FlaskClient,
        payload: dict,
        group_name: str = "test_group",
    ) -> ProcessInstanceModel:
        process_model = load_test_spec(
            "test_group/message",
            process_model_source_directory="message_send_one_conversation",
            bpmn_file_name="message_sender.bpmn",  # Slightly misnamed, it sends and receives
        )

        process_instance = self.create_process_instance_from_process_model(process_model)
        processor_send_receive = ProcessInstanceProcessor(process_instance)
        processor_send_receive.do_engine_steps(save=True)
        task = processor_send_receive.get_all_user_tasks()[0]
        human_task = process_instance.active_human_tasks[0]

        ProcessInstanceService.complete_form_task(
            processor_send_receive,
            task,
            payload,
            process_instance.process_initiator,
            human_task,
        )
        processor_send_receive.save()
        return process_instance

    def assure_a_message_was_sent(self, process_instance: ProcessInstanceModel, payload: dict) -> None:
        # There should be one new send message for the given process instance.
        send_messages = (
            MessageInstanceModel.query.filter_by(message_type="send")
            .filter_by(process_instance_id=process_instance.id)
            .order_by(MessageInstanceModel.id)
            .all()
        )
        assert len(send_messages) == 1
        send_message = send_messages[0]
        assert send_message.payload == payload, "The send message should match up with the payload"
        assert send_message.name == "Request Approval"
        assert send_message.status == "ready"

    def assure_there_is_a_process_waiting_on_a_message(self, process_instance: ProcessInstanceModel) -> None:
        # There should be one new send message for the given process instance.
        waiting_messages = (
            MessageInstanceModel.query.filter_by(message_type="receive")
            .filter_by(status="ready")
            .filter_by(process_instance_id=process_instance.id)
            .order_by(MessageInstanceModel.id)
            .all()
        )
        assert len(waiting_messages) == 1
        waiting_message = waiting_messages[0]
        self.assure_correlation_properties_are_right(waiting_message)

    def assure_correlation_properties_are_right(self, message: MessageInstanceModel) -> None:
        # Correlation Properties should match up
        po_curr = next(c for c in message.correlation_rules if c.name == "po_number")
        customer_curr = next(c for c in message.correlation_rules if c.name == "customer_id")
        assert po_curr is not None
        assert customer_curr is not None