from pydantic import ValidationError

from core_dsl import parse_workflow_definition
from core_shared import JSONValue
from app.db.models import AppDefinition, AppVersion, WorkflowDefinitionModel, WorkflowVersion
from app.domain.repositories import (
    AppDefinitionRepository,
    AppVersionRepository,
    WorkflowDefinitionRepository,
    WorkflowVersionRepository,
)
from app.schemas.app import AppCreateRequest, AppVersionCreateRequest
from app.schemas.workflow import WorkflowCreateRequest, WorkflowVersionCreateRequest


class WorkflowApplicationService:
    def __init__(
        self,
        app_repository: AppDefinitionRepository,
        workflow_repository: WorkflowDefinitionRepository,
        app_version_repository: AppVersionRepository,
        workflow_version_repository: WorkflowVersionRepository,
    ) -> None:
        self.app_repository = app_repository
        self.workflow_repository = workflow_repository
        self.app_version_repository = app_version_repository
        self.workflow_version_repository = workflow_version_repository

    def create_app(self, payload: AppCreateRequest) -> AppDefinition:
        return self.app_repository.create(
            tenant_id=payload.tenant_id,
            code=payload.code,
            name=payload.name,
            description=payload.description,
            owner_user_id=payload.owner_user_id,
            settings_json=payload.settings_json,
        )

    def list_apps(self, tenant_id: str) -> list[AppDefinition]:
        return self.app_repository.list_by_tenant(tenant_id)

    def create_workflow(self, payload: WorkflowCreateRequest) -> WorkflowDefinitionModel:
        return self.workflow_repository.create(
            tenant_id=payload.tenant_id,
            app_id=payload.app_id,
            code=payload.code,
            name=payload.name,
            workflow_type=payload.workflow_type,
        )

    def list_workflows(self, tenant_id: str, app_id: str | None = None) -> list[WorkflowDefinitionModel]:
        return self.workflow_repository.list_by_scope(tenant_id=tenant_id, app_id=app_id)

    def create_workflow_version(self, payload: WorkflowVersionCreateRequest) -> WorkflowVersion:
        dsl_json = self._validate_workflow_dsl(payload.dsl_json)
        return self.workflow_version_repository.create(
            tenant_id=payload.tenant_id,
            workflow_id=payload.workflow_id,
            dsl_json=dsl_json,
            compiled_plan_json=payload.compiled_plan_json,
            schema_version=payload.schema_version,
            checksum=payload.checksum,
            status=payload.status,
        )

    def list_workflow_versions(self, tenant_id: str, workflow_id: str) -> list[WorkflowVersion]:
        return self.workflow_version_repository.list_by_workflow(
            tenant_id=tenant_id,
            workflow_id=workflow_id,
        )

    def get_workflow_version(self, tenant_id: str, workflow_version_id: str) -> WorkflowVersion | None:
        return self.workflow_version_repository.get_by_id(
            tenant_id=tenant_id,
            workflow_version_id=workflow_version_id,
        )

    def create_app_version(self, payload: AppVersionCreateRequest) -> AppVersion:
        return self.app_version_repository.create(
            tenant_id=payload.tenant_id,
            app_id=payload.app_id,
            workflow_version_id=payload.workflow_version_id,
            status=payload.status,
            published_by=payload.published_by,
            changelog=payload.changelog,
        )

    def list_app_versions(self, tenant_id: str, app_id: str) -> list[AppVersion]:
        return self.app_version_repository.list_by_app(tenant_id=tenant_id, app_id=app_id)

    def _validate_workflow_dsl(
        self,
        dsl_json: dict[str, JSONValue] | None,
    ) -> dict[str, JSONValue] | None:
        if dsl_json is None:
            return None

        try:
            workflow = parse_workflow_definition(dsl_json)
        except ValidationError as exc:
            raise ValueError(f"invalid workflow dsl: {exc}") from exc

        if workflow is None:
            return None
        return workflow.model_dump(mode="json")