export type ProspectAssessment = {
  row: Record<string, unknown>;
  suggestion: {
    fit: "likely_fit" | "unlikely_fit" | "unknown";
    score?: number;
    reason: string;
  };
};

/** Validate the entire file before the first write, including optional legacy scores. */
export function parseProspectAssessments(input: unknown): ProspectAssessment[] {
  if (!Array.isArray(input) || !input.length || input.length > 100)
    throw new Error("Provide 1–100 assessments containing row and suggestion.");
  return input.map((entry) => {
    const row = entry?.row;
    const suggestion = entry?.suggestion;
    if (
      !row ||
      typeof row !== "object" ||
      Array.isArray(row) ||
      !suggestion ||
      !["likely_fit", "unlikely_fit", "unknown"].includes(suggestion.fit) ||
      typeof suggestion.reason !== "string" ||
      !suggestion.reason.trim() ||
      suggestion.reason.length > 2000
    )
      throw new Error(
        "Each assessment needs a profile row, fit (likely_fit|unlikely_fit|unknown), and a reason of 1–2000 characters.",
      );
    const score = suggestion.score;
    if (
      score !== undefined &&
      (typeof score !== "number" ||
        !Number.isInteger(score) ||
        score < 0 ||
        score > 100)
    )
      throw new Error(
        "ICP relevance score must be a whole number from 0 to 100.",
      );
    return {
      row,
      suggestion: {
        fit: suggestion.fit,
        reason: suggestion.reason.trim(),
        ...(score !== undefined ? { score } : {}),
      },
    };
  });
}