from __future__ import annotations

import asyncio
from app.core.context_builder import ContextBuilder
from app.core.contracts import ExecutionDirective, PermissionDecision, PermissionRequest, RuntimeEvent, TaskCheckpoint, UserTask
from app.core.execution_engine import ExecutionEngine
from app.core.async_router import AsyncRouter
from app.events.event_bus import EventBus
from app.events.event_types import CHECKPOINT_SAVED, CONTEXT_BUILT, TASK_AWAITING_PERMISSION, TASK_COMPLETED, TASK_FAILED, TASK_RECEIVED
from app.core.permission_service import PermissionService
from app.state.checkpoint_store import SQLiteCheckpointStore
from app.state.task_state_store import SQLiteTaskStateStore


class AsyncRuntimeLoop:
    """Async runtime loop using LLM orchestrator."""

    def __init__(
        self,
        event_bus: EventBus,
        task_state_store: SQLiteTaskStateStore,
        checkpoint_store: SQLiteCheckpointStore,
        context_builder: ContextBuilder,
        router: AsyncRouter,
        execution_engine: ExecutionEngine,
        permission_service: PermissionService,
        memory_interface=None,
    ) -> None:
        self._event_bus = event_bus
        self._task_state_store = task_state_store
        self._checkpoint_store = checkpoint_store
        self._context_builder = context_builder
        self._router = router
        self._execution_engine = execution_engine
        self._permission_service = permission_service
        self._memory_interface = memory_interface

    async def run_task(self, task: UserTask) -> dict[str, object]:
        state = self._task_state_store.create_task(
            task.task_id,
            {
                "status": "received",
                "session_id": task.session_id,
                "plan": None,
                "task_input": task.input,
                "task_context": task.context,
            },
        )
        self._publish(task, TASK_RECEIVED, {"status": "received"})

        checkpoint = TaskCheckpoint(task_id=task.task_id, status="received")
        self._checkpoint_store.save(checkpoint)
        self._publish(task, CHECKPOINT_SAVED, checkpoint.model_dump(mode="json"))

        context = self._context_builder.build(task=task, checkpoint=checkpoint)
        self._publish(task, CONTEXT_BUILT, {"keys": sorted(context.keys())})

        directive = await self._router.decide(state=state, context=context, task_id=task.task_id, session_id=task.session_id)
        
        execution_result = await asyncio.to_thread(
            self._execution_engine.execute,
            task=task,
            directive=directive,
        )
        
        state_patch = {"status": execution_result["status"], "last_directive": directive.model_dump(mode="json")}
        
        if execution_result["status"] == "awaiting_permission":
            state_patch["pending_permission_request"] = execution_result["result"].get("permission_request")
        
        self._task_state_store.update_task(task.task_id, state_patch)
        
        status = execution_result["status"]
        
        if status == "completed":
            self._publish(task, TASK_COMPLETED, {"directive": directive.model_dump(mode="json"), "execution_result": execution_result["result"]})
        elif status == "failed":
            self._publish(task, TASK_FAILED, {"error": execution_result.get("result", {}).get("error")})
        
        checkpoint.status = status
        self._checkpoint_store.save(checkpoint)
        self._publish(task, CHECKPOINT_SAVED, checkpoint.model_dump(mode="json"))

        # Save task and result to memory for session context
        self._save_to_memory(task, execution_result, status)

        return {
            "task_id": task.task_id,
            "status": status,
            "directive": directive.model_dump(mode="json"),
            "result": execution_result.get("result"),
            "events": list(self._event_bus.get_task_events(task.task_id)),
        }

    def _publish(self, task: UserTask, event_type: str, payload: dict) -> None:
        if not self._event_bus:
            return
        event = RuntimeEvent(
            task_id=task.task_id,
            session_id=task.session_id,
            sequence=self._event_bus.next_sequence(task.task_id),
            type=event_type,
            payload=payload,
        )
        self._event_bus.publish(event)

    def _save_to_memory(self, task: UserTask, execution_result: dict, status: str) -> None:
        """Save task input and result to memory for session context."""
        if not self._memory_interface:
            return

        try:
            # Save task input as summary
            self._memory_interface.insert(
                text=f"User request: {task.input}",
                kind="summary",
                source="user",
                task_id=task.task_id,
                session_id=task.session_id,
                weight=0.8,
                metadata={"status": status},
            )

            # Save execution result
            result_text = ""
            if status == "completed":
                step_results = execution_result.get("result", {}).get("step_results", [])
                if step_results:
                    for step in step_results:
                        tool_result = step.get("result", {}).get("result", {})
                        if tool_result.get("output"):
                            result_text += f" | {step.get('step_id')}: {tool_result.get('output')[:200]}"
            elif status == "failed":
                result_text = f" | Error: {execution_result.get('result', {}).get('error', 'Unknown')}"

            if result_text:
                self._memory_interface.insert(
                    text=f"Result: {status}{result_text}",
                    kind="tool_result",
                    source="system",
                    task_id=task.task_id,
                    session_id=task.session_id,
                    weight=0.7,
                    metadata={"status": status},
                )
        except Exception as e:
            import logging
            logging.getLogger(__name__).warning(f"Failed to save to memory: {e}")