from __future__ import annotations

from backend.engine import primitives


class WorkflowExecutor:
    def __init__(self) -> None:
        self.registry = {
            "email_received": primitives.email_received,
            "schedule": primitives.schedule,
            "file_uploaded": primitives.file_uploaded,
            "manual_trigger": primitives.manual_trigger,
            "ai_extract": primitives.ai_extract,
            "ai_classify": primitives.ai_classify,
            "ai_compose": primitives.ai_compose,
            "sheets_read": primitives.sheets_read,
            "sheets_write": primitives.sheets_write,
            "sheets_update": primitives.sheets_update,
            "send_email": primitives.send_email,
            "notify_owner": primitives.notify_owner,
            "condition": primitives.condition,
            "loop": primitives.loop,
            "wait_for_input": primitives.wait_for_input,
        }

    def execute(self, workflow: dict, trigger: dict, db, owner_id: str) -> dict:
        runtime = {
            "trigger": trigger,
            "db": db,
            "owner_id": owner_id,
            "owner": db.get_owner(owner_id),
            "workflow_id": workflow["id"],
            "step_results": {},
        }
        steps_executed = []
        next_override = None
        try:
            for step in workflow["steps"]:
                if next_override and step["id"] != next_override and step["id"].startswith("step_notify"):
                    continue
                result = self.registry[step["action"]](step["params"], runtime)
                normalized = result["rows"] if isinstance(result, dict) and "rows" in result else result
                if isinstance(normalized, dict):
                    runtime["step_results"][step["id"]] = normalized
                steps_executed.append({"id": step["id"], "action": step["action"], "result": result})
                if step["action"] == "condition":
                    next_override = result["next_step"]
            return {"outcome": "completed", "steps": steps_executed}
        except Exception as exc:  # pragma: no cover - defensive path
            return {"outcome": "error", "steps": steps_executed, "error": str(exc)}