import type { TurnConfig } from "@/lib/api";

export function defaultTurnConfig(): TurnConfig {
  return {
    bargeIn: { strategy: "vad" },
    vad: {
      confidence: 0.7,
      startSecs: 0.2,
      stopSecs: 0.2,
      minVolume: 0.6,
    },
    turnDetection: {
      strategy: "silence",
      silenceTimeoutSecs: 0.6,
    },
  };
}

function record(value: unknown): Record<string, unknown> {
  return value && typeof value === "object"
    ? (value as Record<string, unknown>)
    : {};
}

function numberOr(value: unknown, fallback: number): number {
  return typeof value === "number" && Number.isFinite(value)
    ? value
    : fallback;
}

/** Fill settings introduced after the first Workflow release for old records. */
export function normalizeTurnConfig(value: unknown): TurnConfig {
  const defaults = defaultTurnConfig();
  const input = record(value);
  const bargeIn = record(input.bargeIn);
  const vad = record(input.vad);
  const turnDetection = record(input.turnDetection);

  return {
    bargeIn: {
      strategy:
        bargeIn.strategy === "transcription" ? "transcription" : "vad",
    },
    vad: {
      confidence: numberOr(vad.confidence, defaults.vad.confidence),
      startSecs: numberOr(vad.startSecs, defaults.vad.startSecs),
      stopSecs: numberOr(vad.stopSecs, defaults.vad.stopSecs),
      minVolume: numberOr(vad.minVolume, defaults.vad.minVolume),
    },
    turnDetection: {
      strategy:
        turnDetection.strategy === "smart_turn" ? "smart_turn" : "silence",
      silenceTimeoutSecs: numberOr(
        turnDetection.silenceTimeoutSecs,
        defaults.turnDetection.silenceTimeoutSecs,
      ),
    },
  };
}