import { basename, dirname } from "node:path";
import { DatabaseSync } from "node:sqlite";

/** 只读已有副本；保留 incomplete 的数值及重复尝试，不冒充有效成绩。 */
export function referenceScores(path: string) {
  const study = basename(dirname(path));
  const db = new DatabaseSync(path, { readOnly: true });
  try {
    type Fact<T> = { seq: number; content: T };
    const facts = <T>(kind: string): Fact<T>[] =>
      (
        db
          .prepare(
            "SELECT created_seq, payload FROM facts WHERE kind = ? ORDER BY created_seq",
          )
          .all(kind) as Array<{ created_seq: number; payload: string }>
      ).map((r) => ({
        seq: r.created_seq,
        content: JSON.parse(r.payload) as T,
      }));
    const links = facts<{
      purpose: string;
      roundId: string;
      runId: string;
      candidateId: string;
    }>("run-link");
    const observations = facts<{
      runId: string;
      status: string;
      finalMetric: { value: number | null };
      reasons: string[];
    }>("run-observation");
    const adoption = facts<{
      roundId: string;
      adoptedRunId: string | null;
      newBaselineId: string;
    }>("adoption").find((r) => r.content.roundId === `${study}.r1`)!;
    return links
      .filter(
        (r) =>
          r.content.purpose === "forward" &&
          r.content.roundId === `${study}.r1`,
      )
      .map((link) => {
        const observation = observations.find(
          (r) => r.content.runId === link.content.runId,
        )!;
        return {
          source: path,
          study,
          candidate: link.content.candidateId,
          run: link.content.runId,
          status: observation.content.status,
          rawScore: observation.content.finalMetric.value,
          validScore:
            observation.content.status === "valid"
              ? observation.content.finalMetric.value
              : null,
          adopted: adoption.content.adoptedRunId === link.content.runId,
          newBaseline: adoption.content.newBaselineId,
          linkSeq: link.seq,
          observationSeq: observation.seq,
          adoptionSeq: adoption.seq,
          reasons: observation.content.reasons,
        };
      });
  } finally {
    db.close();
  }
}