"""Task Center statistics."""

from typing import Any


class TaskStatistics:
    def summarize(self, tasks: list[dict[str, Any]] | None = None) -> dict[str, Any]:
        tasks = tasks or []
        completed = [t for t in tasks if t.get("status") == "completed"]
        blocked = [t for t in tasks if t.get("status") == "blocked"]
        waiting = [t for t in tasks if t.get("status") == "waiting_approval"]
        elapsed = [t.get("elapsed_seconds", 0) for t in tasks if t.get("elapsed_seconds") is not None]
        return {
            "total": len(tasks),
            "completed": len(completed),
            "blocked": len(blocked),
            "waiting_approval": len(waiting),
            "completion_rate": round(len(completed) / len(tasks) * 100, 2) if tasks else 0,
            "average_elapsed_seconds": round(sum(elapsed) / len(elapsed), 2) if elapsed else 0,
            "top_blockers": self._top_values(blocked, "blocker"),
            "executor_distribution": self._top_values(tasks, "executor"),
        }

    def _top_values(self, tasks: list[dict[str, Any]], key: str):
        result: dict[str, int] = {}
        for task in tasks:
            value = task.get(key)
            if value:
                result[value] = result.get(value, 0) + 1
        return result


__all__ = ["TaskStatistics"]