from core_dsl import parse_workflow_definition
from core_shared import JSONValue
from pydantic import ValidationError

from app.application.designer import (
    WorkflowDebugPlan,
    WorkflowInspection,
    build_debug_plan,
    inspect_workflow_dsl,
)
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,
    WorkflowDebuggerPlanRequest,
    WorkflowDesignerValidateRequest,
    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(
            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) -> list[AppDefinition]:
        return self.app_repository.list_all()

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

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

    def create_workflow_version(self, payload: WorkflowVersionCreateRequest) -> WorkflowVersion:
        dsl_json = self._validate_workflow_dsl(payload.dsl_json)
        compiled_plan_json = payload.compiled_plan_json
        if compiled_plan_json is None and dsl_json is not None:
            compiled_plan_json = self._build_compiled_plan_json(dsl_json)
        return self.workflow_version_repository.create(
            workflow_id=payload.workflow_id,
            dsl_json=dsl_json,
            compiled_plan_json=compiled_plan_json,
            schema_version=payload.schema_version,
            checksum=payload.checksum,
            status=payload.status)

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

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

    def validate_designer_workflow(
        self,
        payload: WorkflowDesignerValidateRequest) -> WorkflowInspection:
        return inspect_workflow_dsl(payload.dsl_json)

    def build_designer_debug_plan(
        self,
        payload: WorkflowDebuggerPlanRequest) -> WorkflowDebugPlan:
        return build_debug_plan(
            payload.dsl_json,
            max_preview_steps=payload.max_preview_steps)

    def build_version_debug_plan(
        self,
        *,
        workflow_version_id: str,
        max_preview_steps: int) -> WorkflowDebugPlan | None:
        entity = self.get_workflow_version(
            workflow_version_id=workflow_version_id)
        if entity is None:
            return None
        return build_debug_plan(
            entity.dsl_json,
            max_preview_steps=max_preview_steps)

    def create_app_version(self, payload: AppVersionCreateRequest) -> AppVersion:
        return self.app_version_repository.create(
            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, app_id: str) -> list[AppVersion]:
        return self.app_version_repository.list_by_app(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

        inspection = inspect_workflow_dsl(dsl_json)
        errors = [item for item in inspection.diagnostics if item.severity == "error"]
        if errors:
            message = "; ".join(f"{item.code}: {item.message}" for item in errors)
            raise ValueError(f"invalid workflow dsl: {message}")

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

    def _build_compiled_plan_json(
        self,
        dsl_json: dict[str, JSONValue]) -> dict[str, JSONValue]:
        plan = build_debug_plan(dsl_json)
        return {
            "valid": plan.inspection.valid,
            "entry_node_ids": plan.inspection.entry_node_ids,
            "terminal_node_ids": plan.inspection.terminal_node_ids,
            "node_count": len(plan.inspection.nodes),
            "edge_count": len(plan.inspection.edges),
            "execution_preview": [
                {
                    "step_index": item.step_index,
                    "node_id": item.node_id,
                    "node_type": item.node_type,
                    "name": item.name,
                    "next_node_ids": item.next_node_ids,
                }
                for item in plan.execution_preview
            ],
        }