import { describe, expect, it } from "vitest";
import {
  canTransition,
  checkDistinctAssets,
  compareRank,
  evaluateCandidate,
  movieCompletion,
  type ParsedRelease,
  parseRelease,
  qualityTier,
  rankForSlot,
  type SlotSpec,
  type SlotState,
  SlotTransitionError,
  transition,
  unitCompletion,
} from "../src/index.ts";

const GiB = 1024 ** 3;
const rel = (t: string, over: Partial<ParsedRelease> = {}): ParsedRelease => ({ ...parseRelease(t), ...over });

const archival4k: SlotSpec = {
  id: "s-4k",
  name: "4K 蓝光压制",
  hard: { resolutions: ["2160p"], sources: ["BluRay", "WEB-DL"], maxSizeBytes: 40 * GiB },
  soft: { hdr: ["DV", "HDR10"], groups: ["CHD", "FraMeSToR"], preferredSizeBytes: { max: 30 * GiB } },
  upgrade: { enabled: true },
};

describe("evaluateCandidate 硬条件", () => {
  it("满足 → accept 并给软偏好排序键", () => {
    const r = evaluateCandidate(archival4k, rel("Dune.2021.2160p.BluRay.x265.DV-CHD 20GB"));
    expect(r.decision).toBe("accept");
    if (r.decision !== "accept") return;
    expect(r.softRank).toEqual([2, 2, 0, 0, 1]);
    expect(r.tier).toEqual({ source: 3, resolution: 6 });
  });
  it("已知不满足 → reject,列出全部违规", () => {
    const r = evaluateCandidate(archival4k, rel("Dune.2021.1080p.HDTV.x264-GRP 50GB"));
    expect(r.decision).toBe("reject");
    if (r.decision !== "reject") return;
    expect(r.violations.map((v) => `${v.field}:${v.code}`)).toEqual([
      "resolution:not_allowed",
      "source:not_allowed",
      "size:too_large",
    ]);
  });
  it("缺字段 → unknown_field(与不满足区分)", () => {
    const r = evaluateCandidate(archival4k, rel("Dune 2021 BluRay"));
    expect(r).toMatchObject({ decision: "unknown_field", missing: ["resolution", "size"] });
  });
  it("unknownPolicy 可按字段配置 reject / accept", () => {
    const spec: SlotSpec = { ...archival4k, unknownPolicy: { size: "accept", resolution: "reject" } };
    const r = evaluateCandidate(spec, rel("Dune 2021 BluRay"));
    expect(r.decision).toBe("reject");
    const ok = evaluateCandidate({ ...archival4k, unknownPolicy: "accept" }, rel("Dune 2021 BluRay"));
    expect(ok.decision).toBe("accept");
    if (ok.decision === "accept") expect(ok.reasons).toContain("unknown_size_accepted_by_policy");
  });
  it("必需字幕:未知 hold,缺语言 reject,zh 可被 zh-Hans 满足", () => {
    const spec: SlotSpec = { name: "zh", hard: { requiredSubtitles: ["zh"] } };
    expect(evaluateCandidate(spec, rel("Movie 2020 1080p")).decision).toBe("unknown_field");
    expect(evaluateCandidate(spec, rel("Movie 2020 1080p 简体字幕")).decision).toBe("accept");
    const r = evaluateCandidate({ name: "en", hard: { requiredSubtitles: ["en"] } }, rel("Movie 2020 简体字幕"));
    expect(r.decision).toBe("reject");
  });
  it("内容版本 / 仅二压 / 排除组 / 内容类型 / 最小体积", () => {
    const cutSpec: SlotSpec = { name: "c", hard: { cuts: ["Extended"] } };
    expect(evaluateCandidate(cutSpec, rel("LOTR 2001 Extended 1080p")).decision).toBe("accept");
    expect(evaluateCandidate(cutSpec, rel("LOTR 2001 1080p")).decision).toBe("reject");
    const enc: SlotSpec = { name: "e", hard: { requireEncode: true } };
    expect(evaluateCandidate(enc, rel("Movie 2020 1080p BluRay REMUX")).decision).toBe("reject");
    expect(evaluateCandidate(enc, rel("Movie 2020 1080p BluRay x264")).decision).toBe("accept");
    expect(evaluateCandidate(enc, rel("Movie 2020 1080p")).decision).toBe("unknown_field");
    const ex: SlotSpec = { name: "x", hard: { excludeGroups: ["badgrp"] } };
    expect(evaluateCandidate(ex, rel("Movie.2020.1080p.WEB-DL-BADGRP")).decision).toBe("reject");
    const ct: SlotSpec = { name: "m", hard: { contentTypes: ["main"] } };
    expect(evaluateCandidate(ct, rel("某综艺 第1期 加更")).decision).toBe("reject");
    expect(evaluateCandidate(ct, rel("某综艺 第1期")).decision).toBe("unknown_field");
    expect(evaluateCandidate(ct, rel("某综艺 第1期 正片")).decision).toBe("accept");
    const min: SlotSpec = { name: "min", hard: { minSizeBytes: 2 * GiB } };
    expect(evaluateCandidate(min, rel("Movie 2020 1080p 1GB")).decision).toBe("reject");
  });
});

describe("升级规则", () => {
  const cur4kWeb = { resolution: "2160p" as const, source: "WEB-DL" as const };
  it("WEB-DL → 蓝光二压:upgrade", () => {
    const r = evaluateCandidate(archival4k, rel("Dune.2021.2160p.BluRay.x265-CHD 20GB"), cur4kWeb);
    expect(r.decision).toBe("upgrade");
    if (r.decision === "upgrade") expect(r.fromTier.source).toBe(2);
  });
  it("同等级不反复更换", () => {
    const r = evaluateCandidate(archival4k, rel("Dune.2021.2160p.WEB-DL.DV-FLUX 20GB"), cur4kWeb);
    expect(r).toMatchObject({ decision: "reject", violations: [{ code: "same_tier" }] });
    const remuxToEncode = evaluateCandidate(
      { ...archival4k, hard: { resolutions: ["2160p"] } },
      rel("Dune.2021.2160p.BluRay.x265-CHD 20GB"),
      { resolution: "2160p", source: "REMUX" },
    );
    expect(remuxToEncode).toMatchObject({ decision: "reject", violations: [{ code: "same_tier" }] });
  });
  it("更低等级 / 未开启升级 / 当前资产字段未知 / 达到上限", () => {
    const hi = { resolution: "2160p" as const, source: "BluRay" as const };
    expect(evaluateCandidate(archival4k, rel("Dune.2021.2160p.WEB-DL 20GB"), hi)).toMatchObject({
      violations: [{ code: "lower_tier" }],
    });
    expect(
      evaluateCandidate({ ...archival4k, upgrade: { enabled: false } }, rel("Dune.2021.2160p.BluRay 2GB"), cur4kWeb),
    ).toMatchObject({ violations: [{ code: "upgrade_disabled" }] });
    expect(
      evaluateCandidate({ ...archival4k, upgrade: undefined }, rel("Dune.2021.2160p.BluRay 2GB"), cur4kWeb),
    ).toMatchObject({ decision: "reject" });
    expect(evaluateCandidate(archival4k, rel("Dune.2021.2160p.BluRay 2GB"), {})).toMatchObject({
      decision: "unknown_field",
      missing: ["current_asset"],
    });
    expect(
      evaluateCandidate(
        { ...archival4k, upgrade: { enabled: true, ceilingTier: 2 } },
        rel("Dune.2021.2160p.BluRay 2GB"),
        cur4kWeb,
      ),
    ).toMatchObject({ violations: [{ code: "at_ceiling" }] });
  });
  it("最小改进阈值 2 级:WEBRip → WEB-DL 不够", () => {
    const spec: SlotSpec = { name: "x", hard: {}, upgrade: { enabled: true, minTierSteps: 2 } };
    const r = evaluateCandidate(spec, rel("Movie 2020 1080p WEB-DL"), { resolution: "1080p", source: "WEBRip" });
    expect(r).toMatchObject({ violations: [{ code: "below_min_improvement" }] });
  });
  it("分辨率升级需显式允许", () => {
    const spec: SlotSpec = { name: "x", hard: {}, upgrade: { enabled: true, allowResolutionUpgrade: true } };
    const cur = { resolution: "1080p" as const, source: "WEB-DL" as const };
    expect(evaluateCandidate(spec, rel("M 2020 2160p WEB-DL"), cur).decision).toBe("upgrade");
    expect(evaluateCandidate({ ...spec, upgrade: { enabled: true } }, rel("M 2020 2160p WEB-DL"), cur).decision).toBe(
      "reject",
    );
  });
  it("合格压制组名单:名单外压制不自动升级", () => {
    const spec: SlotSpec = { ...archival4k, upgrade: { enabled: true, encodeGroupAllowlist: ["CHD"] } };
    expect(evaluateCandidate(spec, rel("Dune.2021.2160p.BluRay.x265-CHD 20GB"), cur4kWeb).decision).toBe("upgrade");
    expect(evaluateCandidate(spec, rel("Dune.2021.2160p.BluRay.x265-LOWQ 20GB"), cur4kWeb)).toMatchObject({
      violations: [{ code: "encode_not_qualified" }],
    });
  });
  it("自定义来源等级表", () => {
    expect(
      qualityTier(
        { source: "REMUX", resolution: "1080p" },
        { name: "x", hard: {}, upgrade: { enabled: true, sourceTiers: { REMUX: 5 } } },
      ),
    ).toEqual({
      source: 5,
      resolution: 4,
    });
    expect(qualityTier({})).toEqual({ source: -1, resolution: -1 });
  });
});

describe("rankForSlot 排序", () => {
  it("可用在前;按等级再按软偏好", () => {
    const cands = [
      rel("Dune.2021.2160p.WEB-DL.DV-FLUX 20GB"),
      rel("Dune.2021.1080p.BluRay-CHD 10GB"),
      rel("Dune.2021.2160p.BluRay.x265.HDR-SPARKS 35GB"),
      rel("Dune.2021.2160p.BluRay.x265.DV-CHD 25GB"),
    ];
    const ranked = rankForSlot(archival4k, cands);
    expect(ranked.map((r) => r.candidate.releaseGroup?.name)).toEqual(["CHD", "SPARKS", "FLUX", "CHD"]);
    expect(ranked[3]!.evaluation.decision).toBe("reject");
  });
  it("compareRank 字典序", () => {
    expect(compareRank([1, 0], [0, 5])).toBeGreaterThan(0);
    expect(compareRank([1], [1, 0])).toBe(0);
  });
});

describe("Slot 状态机", () => {
  const s = (status: SlotState["status"], hasAsset = false): SlotState => ({ status, hasAsset });
  it("主路径 empty→reserved→downloading→verifying→satisfied", () => {
    let st = s("empty");
    st = transition(st, { type: "reserve" });
    st = transition(st, { type: "download_started" });
    st = transition(st, { type: "download_completed" });
    st = transition(st, { type: "verify_passed", complete: true });
    expect(st).toEqual({ status: "satisfied", hasAsset: true });
  });
  it("升级路径保留旧资产,取消回到 satisfied", () => {
    let st = transition(s("satisfied", true), { type: "upgrade_found" });
    expect(st.status).toBe("upgrade_pending");
    expect(transition(st, { type: "upgrade_cancelled" }).status).toBe("satisfied");
    st = transition(st, { type: "reserve" });
    expect(transition(st, { type: "release" })).toEqual({ status: "satisfied", hasAsset: true });
    expect(transition(s("reserved"), { type: "release" }).status).toBe("empty");
  });
  it("失败/校验失败进 attention,解决后按是否有资产回退", () => {
    expect(transition(s("downloading"), { type: "download_failed" }).status).toBe("attention");
    expect(transition(s("reserved"), { type: "download_failed" }).status).toBe("attention");
    expect(transition(s("verifying"), { type: "verify_failed" }).status).toBe("attention");
    expect(transition(s("attention"), { type: "attention_resolved", hasAsset: true }).status).toBe("satisfied");
    expect(transition(s("attention"), { type: "attention_resolved", hasAsset: false }).status).toBe("empty");
    expect(transition(s("attention"), { type: "reserve" }).status).toBe("reserved");
    expect(transition(s("satisfied", true), { type: "asset_missing_confirmed" })).toEqual({
      status: "attention",
      hasAsset: false,
    });
  });
  it("需处理经人工整理回到核验,再按实际资产落终态(manual_verify)", () => {
    const st = transition(s("attention"), { type: "manual_verify", reason: "manual_organize" });
    expect(st).toEqual({ status: "verifying", hasAsset: false });
    expect(transition(st, { type: "verify_passed", complete: true })).toEqual({ status: "satisfied", hasAsset: true });
    for (const from of ["empty", "reserved", "downloading", "verifying", "satisfied", "upgrade_pending"] as const)
      expect(canTransition(s(from), { type: "manual_verify", reason: "x" }), from).toBe(false);
  });
  it("部分覆盖回到 empty 但记住已有资产", () => {
    expect(transition(s("verifying"), { type: "verify_passed", complete: false })).toEqual({
      status: "empty",
      hasAsset: true,
    });
  });
  it("非法迁移抛错", () => {
    const illegal: [SlotState["status"], Parameters<typeof transition>[1]][] = [
      ["empty", { type: "download_started" }],
      ["satisfied", { type: "reserve" }],
      ["empty", { type: "release" }],
      ["reserved", { type: "download_completed" }],
      ["empty", { type: "verify_passed", complete: true }],
      ["downloading", { type: "verify_failed" }],
      ["empty", { type: "upgrade_found" }],
      ["satisfied", { type: "upgrade_cancelled" }],
      ["empty", { type: "attention_resolved", hasAsset: false }],
      ["empty", { type: "asset_missing_confirmed" }],
      ["satisfied", { type: "download_failed" }],
    ];
    for (const [from, ev] of illegal) {
      expect(() => transition(s(from), ev), `${from} ${ev.type}`).toThrow(SlotTransitionError);
      expect(canTransition(s(from), ev)).toBe(false);
    }
    expect(canTransition(s("empty"), { type: "reserve" })).toBe(true);
  });
});

describe("完成条件", () => {
  it("电影按内容版本", () => {
    expect(movieCompletion(undefined, [{ assetId: "a", verified: true }]).complete).toBe(true);
    expect(movieCompletion(undefined, [{ assetId: "a", verified: false }]).complete).toBe(false);
    const r = movieCompletion(["default", "Extended"], [{ assetId: "a", verified: true }]);
    expect(r).toEqual({ complete: false, missingCuts: ["Extended"], satisfiedBy: { default: "a" } });
  });
  it("剧集按 content_unit;season pack 需实际文件清单覆盖", () => {
    const req = ["e1", "e2", "e3"];
    const pack = { assetId: "p", verified: true, fileUnits: ["e1", "e2"], claimedUnits: ["e1", "e2", "e3"] };
    const r = unitCompletion(req, [pack], { totalKnown: true });
    expect(r).toEqual({
      complete: false,
      covered: ["e1", "e2"],
      missing: ["e3"],
      unverifiedClaims: ["e3"],
      keepTracking: true,
    });
    const full = unitCompletion(req, [pack, { assetId: "x", verified: true, fileUnits: ["e3"] }], { totalKnown: true });
    expect(full.complete).toBe(true);
    expect(full.keepTracking).toBe(false);
    expect(
      unitCompletion(req, [{ assetId: "x", verified: false, fileUnits: req }], { totalKnown: true }).complete,
    ).toBe(false);
    expect(
      unitCompletion(["e1"], [{ assetId: "x", verified: true, fileUnits: ["e1"] }], { totalKnown: false }),
    ).toMatchObject({
      complete: true,
      keepTracking: true,
    });
    expect(unitCompletion([], [], { totalKnown: false }).complete).toBe(false);
  });
  it("require_distinct_asset 校验", () => {
    const g = { slots: [], requireDistinctAsset: true };
    expect(
      checkDistinctAssets(g, [
        { slotId: "a", assetId: "1" },
        { slotId: "b", assetId: "1" },
      ]),
    ).toEqual({
      ok: false,
      sharedAssets: ["1"],
    });
    expect(
      checkDistinctAssets(g, [
        { slotId: "a", assetId: "1" },
        { slotId: "b", assetId: "2" },
      ]).ok,
    ).toBe(true);
    expect(
      checkDistinctAssets({ slots: [] }, [
        { slotId: "a", assetId: "1" },
        { slotId: "b", assetId: "1" },
      ]).ok,
    ).toBe(true);
  });
});