import type { ParsedRelease } from "../release-parser/types.ts";
import { compareRank, currentPri, qualityTier, softRank } from "./evaluate.ts";
import type { QualityFacts, SlotSpec } from "./types.ts";

/** 缺少关键规格时不能声称同套；集号、文件名、种子 ID 不属于版本身份。 */
export function seasonReleaseKey(q: QualityFacts): string | null {
  if (!q.resolution || !q.source || !q.videoCodec || !q.releaseGroup?.name) return null;
  return JSON.stringify([
    q.resolution,
    q.source,
    q.videoCodec,
    q.releaseGroup.name
      .toLowerCase()
      .split("@")
      .map((g) => g.trim())
      .sort(),
    [...(q.hdr ?? [])].sort(),
    q.cut ?? "default",
  ]);
}

export function upgradeSpec(spec: SlotSpec): SlotSpec {
  return {
    ...spec,
    ...(spec.upgradeRules ? { rules: spec.upgradeRules } : {}),
    ...(spec.upgradeHard ? { hard: spec.upgradeHard } : {}),
  };
}

/** 优先级、软偏好、规范化规格形成稳定顺序；同档对齐不允许质量降档。 */
export function selectSeasonRelease(spec: SlotSpec, versions: readonly QualityFacts[]): QualityFacts | undefined {
  let target: QualityFacts | undefined;
  const rank = (q: QualityFacts) => {
    const tier = qualityTier(q, spec);
    return [
      currentPri(spec, q),
      tier.source,
      tier.resolution,
      ...softRank(spec, { raw: "", hdr: [], audio: [], ...q } as unknown as ParsedRelease),
    ];
  };
  for (const q of versions) {
    const key = seasonReleaseKey(q);
    if (!key) continue;
    const compared = target ? compareRank(rank(q), rank(target)) : 1;
    if (compared > 0 || (compared === 0 && key < seasonReleaseKey(target!)!)) target = q;
  }
  return target;
}