"""Toy Solar Meter Adapter with deterministic replay support."""

from dataclasses import dataclass, field
from typing import Any, Dict, List, Optional


@dataclass
class SolarMeterAdapter:
    site_id: str
    samples: Optional[List[Dict[str, Any]]] = None
    _cursor: int = field(init=False, default=0)

    def __post_init__(self) -> None:
        if self.samples is None:
            self.samples = []

    def read_meter(self) -> Dict[str, Any]:
        if self.samples:
            sample_list = self.samples
            if self._cursor >= len(sample_list):
                raise IndexError("No more solar meter samples available")
            reading = dict(sample_list[self._cursor])
            self._cursor += 1
            reading.setdefault("site_id", self.site_id)
            reading.setdefault("timestamp", self._cursor)
            reading.setdefault("status", "ok")
            return reading

        return {
            "site_id": self.site_id,
            "timestamp": self._cursor,
            "solar_output_kw": 750.0,
            "status": "ok",
        }