import type {
  AcquisitionSlot,
  AutoFillMode,
  CoverageCell,
  JsonObject,
  Subscription,
  SubscriptionCoverage,
  SubscriptionGroup,
  SubscriptionMediaKind,
  SubscriptionOverviewItem,
  SubscriptionSlotSummary,
} from "@umt/contracts";
import type { StatusTone } from "~/components/console/status-badge.tsx";

// 订阅页(FE-5)的纯函数:分组/徽标/进度文案、矩阵格语义、表单 ↔ params。docs/design/subscriptions.md §1–§3。

export const SUB_KIND_LABEL: Record<SubscriptionMediaKind, string> = { series: "剧集", movie: "电影", variety: "综艺" };

/** 分组展示顺序(设计 §1.1:待定、追更中、待搜索、已完成、暂停) */
export const GROUP_ORDER: SubscriptionGroup[] = ["pending", "following", "waiting", "completed", "paused"];
export const GROUP_LABEL: Record<SubscriptionGroup, string> = {
  following: "追更中",
  waiting: "待搜索",
  completed: "已完成",
  paused: "暂停",
  pending: "待定",
};

export type ToneLabel = { label: string; tone: StatusTone };

/** 进度文字:已入库/总;总未知为 "?" */
export function progressText(p: SubscriptionOverviewItem["progress"]): string {
  return `${p.have}/${p.total ?? "?"}`;
}

/** 进度两段(已入库、在途)占比;总未知时按 已入库+在途 为分母只画相对比例 */
export function progressParts(p: SubscriptionOverviewItem["progress"]): { have: number; inflight: number } {
  const denom = p.total ?? 0;
  if (denom <= 0) return { have: 0, inflight: 0 };
  return { have: Math.min(1, p.have / denom), inflight: Math.min(1 - Math.min(1, p.have / denom), p.inflight / denom) };
}

/** 季标签:S0 → 特别篇;接续后续季 → "S2 起";电影 / 全部季 → null */
export function seasonLabel(
  x: Pick<SubscriptionOverviewItem, "mediaKind" | "seasonNumber" | "seasonScope">,
): string | null {
  if (x.mediaKind === "movie") return null;
  if (x.seasonNumber === null) return x.seasonScope === "following_seasons" ? "全部季" : null;
  const base = x.seasonNumber === 0 ? "特别篇" : `S${x.seasonNumber}`;
  return x.seasonScope === "following_seasons" && x.seasonNumber > 0 ? `${base} 起` : base;
}

/** 版本目标徽标:洗版中 → 在途 → 缺 N → 已齐;都没有 → 已入库 N */
export function slotBadge(s: SubscriptionSlotSummary): ToneLabel {
  if (s.upgrading)
    return {
      label: s.minPri !== null && s.targetPri !== null ? `洗版中 ${s.minPri}→${s.targetPri}` : "洗版中",
      tone: "warning",
    };
  if (s.inflight > 0) return { label: `在途 ${s.inflight}`, tone: "neutral" };
  if (s.missing > 0) return { label: `缺 ${s.missing}`, tone: "destructive" };
  if (s.total !== null && s.total > 0 && s.have >= s.total) return { label: "已齐", tone: "success" };
  return { label: s.have > 0 ? `已入库 ${s.have}` : "未开始", tone: "neutral" };
}

/** 名称列表折叠:≤max 个名 + "+N";空 = emptyLabel */
export function foldNames(names: string[], max = 2, emptyLabel = "全部站点"): string {
  if (names.length === 0) return emptyLabel;
  const head = names.slice(0, max).join("、");
  return names.length > max ? `${head} +${names.length - max}` : head;
}

export const AUTOFILL_LABEL: Record<AutoFillMode, string> = { inherit: "跟随规则组", on: "开", off: "关" };
export const AUTOFILL_SOURCE: Record<"subscription" | "rule_group" | "default", string> = {
  subscription: "订阅设置",
  rule_group: "规则组",
  default: "系统缺省",
};

export function autoFillText(a: SubscriptionOverviewItem["autoFill"]): string {
  return `自动补全${a.enabled ? "开" : "关"}${a.mode === "inherit" ? `(${AUTOFILL_SOURCE[a.source]})` : ""}`;
}

// ── 覆盖矩阵 ──

export type CoverageColumn = SubscriptionCoverage["seasons"][number]["columns"][number];

/** 各季在展平列里的起止下标 */
export function seasonSlices(cov: SubscriptionCoverage): { start: number; end: number }[] {
  let i = 0;
  return cov.seasons.map((s) => {
    const start = i;
    i += s.columns.length;
    return { start, end: i };
  });
}

export type CellKind =
  | "have"
  | "upgradable"
  | "inflight"
  | "deferred"
  | "missing"
  | "suspected"
  | "not_aired"
  | "skipped";

export function cellKind(c: CoverageCell): CellKind {
  if (c.state === "have") return c.upgradable ? "upgradable" : "have";
  if (c.state === "inflight") return "inflight";
  if (c.state === "missing") {
    if (c.deferred) return "deferred";
    return c.reason === "suspected" ? "suspected" : "missing";
  }
  return c.reason === "not_aired" ? "not_aired" : "skipped";
}

export const CELL_LABEL: Record<CellKind, string> = {
  have: "已入库",
  upgradable: "可升级",
  inflight: "在途",
  deferred: "延后",
  missing: "缺失",
  suspected: "疑似缺失",
  not_aired: "未播出",
  skipped: "不需要",
};

export const PLAN_STAGE: Record<string, string> = { reserved: "已预留", downloading: "下载中", verifying: "核验中" };

export const SKIP_REASON: Record<string, string> = {
  out_of_range: "集范围外",
  not_aired: "未播出",
  not_required: "该版本目标不要求这个内容版本",
  suspected: "总集数未知,按已见最高集推断",
  deferred: "有延后的资源",
};

/** 列头:E03 / 日期 / 电影内容版本 */
export function columnLabel(col: CoverageColumn): string {
  if (col.edition) return col.edition === "default" ? "正片" : col.edition;
  if (col.episode !== null) return `E${String(col.episode).padStart(2, "0")}`;
  if (col.airDate) return col.airDate.slice(5);
  return col.unitKey;
}

export function seasonTitle(s: SubscriptionCoverage["seasons"][number], kind: SubscriptionMediaKind): string {
  if (kind === "movie") return "电影";
  if (s.seasonNumber === null) return "按播出日期";
  return s.seasonNumber === 0 ? "特别篇" : `第 ${s.seasonNumber} 季`;
}

// ── 版本目标 ──

export type UpgradeStrategy = "off" | "per_unit" | "full_pack" | "movie";
export const UPGRADE_LABEL: Record<UpgradeStrategy, string> = {
  off: "不洗版",
  per_unit: "按集洗版",
  full_pack: "全集洗版",
  movie: "洗版",
};

/** 订阅版本目标当前的升级策略:任一开启取其 mode */
export function upgradeOf(
  slots: Pick<AcquisitionSlot, "upgradeThreshold">[],
  kind: SubscriptionMediaKind,
): UpgradeStrategy {
  const on = slots.find((s) => (s.upgradeThreshold as { enabled?: unknown }).enabled === true);
  if (!on) return "off";
  if (kind === "movie") return "movie";
  return (on.upgradeThreshold as { mode?: unknown }).mode === "full_pack" ? "full_pack" : "per_unit";
}

/** 把 from 移到 to(拖动排序) */
export function moveItem<T>(arr: readonly T[], from: number, to: number): T[] {
  const out = arr.slice();
  if (from < 0 || from >= out.length || to < 0 || to >= out.length || from === to) return out;
  const [x] = out.splice(from, 1);
  out.splice(to, 0, x as T);
  return out;
}

// ── 表单 ──

export type SubscriptionDraft = {
  mediaKind: SubscriptionMediaKind;
  seasonUnitId: string;
  seasonScope: Subscription["seasonScope"];
  mode: Subscription["mode"];
  priority: Subscription["priority"];
  episodeStart: string;
  episodeEnd: string;
  total: string;
  totalLocked: boolean;
  siteIds: string[];
  downloaderInstanceId: string;
  libraryRootId: string;
  downloadSavePath: string;
  policyRevisionId: string;
  upgrade: UpgradeStrategy;
  ruleGroupIds: string[];
  include: string;
  exclude: string;
  keywords: string;
  searchIntervalHours: string;
  stopAfter: string;
  autoFill: AutoFillMode;
  unitsPerDay: string;
  gbPerDay: string;
};

const lines = (s: string) =>
  s
    .split(/\n/)
    .map((x) => x.trim())
    .filter(Boolean);
const str = (v: unknown) => (typeof v === "string" ? v : "");
const numStr = (v: unknown) => (typeof v === "number" && Number.isFinite(v) ? String(v) : "");
const strArr = (v: unknown) => (Array.isArray(v) ? v.filter((x): x is string => typeof x === "string") : []);

export function emptyDraft(kind: SubscriptionMediaKind = "series"): SubscriptionDraft {
  return {
    mediaKind: kind,
    seasonUnitId: "",
    seasonScope: kind === "movie" ? "current_season" : "following_seasons",
    mode: kind === "movie" ? "once" : "continuous",
    priority: "tracking",
    episodeStart: "",
    episodeEnd: "",
    total: "",
    totalLocked: false,
    siteIds: [],
    downloaderInstanceId: "",
    libraryRootId: "",
    downloadSavePath: "",
    policyRevisionId: "",
    upgrade: "off",
    ruleGroupIds: [],
    include: "",
    exclude: "",
    keywords: "",
    searchIntervalHours: "",
    stopAfter: "",
    autoFill: "inherit",
    unitsPerDay: "",
    gbPerDay: "",
  };
}

const GB = 1024 ** 3;

/** datetime-local 值 ↔ ISO */
export function toLocalInput(iso: string): string {
  const t = new Date(iso);
  if (Number.isNaN(t.getTime())) return "";
  const p = (n: number) => String(n).padStart(2, "0");
  return `${t.getFullYear()}-${p(t.getMonth() + 1)}-${p(t.getDate())}T${p(t.getHours())}:${p(t.getMinutes())}`;
}

export function draftFromSubscription(sub: Subscription, upgrade: UpgradeStrategy): SubscriptionDraft {
  const p = sub.params as Record<string, unknown>;
  const range = (p.episodeRange ?? {}) as { start?: unknown; end?: unknown };
  const budget = (p.fillBudget ?? {}) as { unitsPerDay?: unknown; bytesPerDay?: unknown };
  const bytes = typeof budget.bytesPerDay === "number" ? budget.bytesPerDay : null;
  return {
    ...emptyDraft(sub.mediaKind),
    mediaKind: sub.mediaKind,
    seasonUnitId: sub.seasonUnitId ?? "",
    seasonScope: sub.seasonScope,
    mode: sub.mode,
    priority: sub.priority,
    episodeStart: numStr(range.start),
    episodeEnd: numStr(range.end),
    siteIds: strArr(p.siteIds),
    downloaderInstanceId: str(p.downloaderInstanceId),
    libraryRootId: str(p.libraryRootId),
    downloadSavePath: str(p.downloadSavePath),
    policyRevisionId: sub.policyRevisionId ?? "",
    upgrade,
    ruleGroupIds: strArr(p.ruleGroupIds),
    include: strArr(p.include).join("\n"),
    exclude: strArr(p.exclude).join("\n"),
    keywords: strArr(p.keywords).join("\n"),
    searchIntervalHours: numStr(p.searchIntervalHours),
    stopAfter: typeof p.stopAfter === "string" ? toLocalInput(p.stopAfter) : "",
    autoFill: p.autoFill === "on" || p.autoFill === "off" ? p.autoFill : "inherit",
    unitsPerDay: numStr(budget.unitsPerDay),
    gbPerDay: bytes !== null ? String(Math.round((bytes / GB) * 10) / 10) : "",
  };
}

export type DraftErrors = Partial<Record<keyof SubscriptionDraft, string>>;

const isInt = (s: string) => /^\d+$/.test(s.trim());

/**
 * 草稿 → params(PATCH 整体替换,所以以现有 params 为底保留未知键)。
 * upgradeChanged:只有升级策略改了才带 best_version(否则每次保存都会 bump 版本目标 revision)。
 */
export function draftToParams(
  d: SubscriptionDraft,
  base: JsonObject = {},
  opts: { upgradeChanged: boolean; totalChanged: boolean },
): { params: JsonObject; errors: DraftErrors } {
  const errors: DraftErrors = {};
  const out: Record<string, unknown> = { ...base };
  const known = [
    "siteIds",
    "episodeRange",
    "searchIntervalHours",
    "stopAfter",
    "downloaderInstanceId",
    "ruleGroupIds",
    "keywords",
    "include",
    "exclude",
    "libraryRootId",
    "downloadSavePath",
    "autoFill",
    "fillBudget",
  ];
  for (const k of known) delete out[k];
  const set = (k: string, v: unknown) => {
    if (v === undefined || v === "" || (Array.isArray(v) && v.length === 0)) return;
    out[k] = v;
  };
  set("siteIds", d.siteIds);
  set("downloaderInstanceId", d.downloaderInstanceId);
  set("libraryRootId", d.libraryRootId);
  set("downloadSavePath", d.downloadSavePath.trim());
  set("ruleGroupIds", d.ruleGroupIds);
  set("include", lines(d.include));
  set("exclude", lines(d.exclude));
  const kw = lines(d.keywords);
  if (kw.length > 10) errors.keywords = "最多 10 个";
  set("keywords", kw);
  if (d.mediaKind !== "movie") {
    const s = d.episodeStart.trim();
    const e = d.episodeEnd.trim();
    if (s && (!isInt(s) || Number(s) < 1)) errors.episodeStart = "填正整数";
    if (e && (!isInt(e) || Number(e) < 1)) errors.episodeEnd = "填正整数";
    if (s && e && !errors.episodeStart && !errors.episodeEnd && Number(e) < Number(s))
      errors.episodeEnd = "结束集不能小于开始集";
    if ((s || e) && !errors.episodeStart && !errors.episodeEnd)
      out.episodeRange = { ...(s ? { start: Number(s) } : {}), ...(e ? { end: Number(e) } : {}) };
    const t = d.total.trim();
    if (t) {
      if (!isInt(t) || Number(t) < 1) errors.total = "填正整数";
      else if (opts.totalChanged) {
        out.total_episode = Number(t);
        out.manual_total_episode = d.totalLocked;
      }
    }
  }
  const h = d.searchIntervalHours.trim();
  if (h) {
    if (!/^\d+(\.\d+)?$/.test(h) || Number(h) > 720) errors.searchIntervalHours = "0–720 小时";
    else out.searchIntervalHours = Number(h);
  }
  if (d.stopAfter) {
    const t = new Date(d.stopAfter);
    if (Number.isNaN(t.getTime())) errors.stopAfter = "时间无效";
    else out.stopAfter = t.toISOString();
  }
  if (d.autoFill !== "inherit") out.autoFill = d.autoFill;
  const budget: Record<string, number> = {};
  if (d.unitsPerDay.trim()) {
    if (!isInt(d.unitsPerDay)) errors.unitsPerDay = "填非负整数";
    else budget.unitsPerDay = Number(d.unitsPerDay);
  }
  if (d.gbPerDay.trim()) {
    const g = Number(d.gbPerDay);
    if (!Number.isFinite(g) || g < 0) errors.gbPerDay = "填非负数";
    else budget.bytesPerDay = Math.round(g * GB);
  }
  if (Object.keys(budget).length) out.fillBudget = budget;
  if (opts.upgradeChanged) {
    out.best_version = d.upgrade !== "off";
    if (d.mediaKind !== "movie") out.best_version_full = d.upgrade === "full_pack";
  }
  return { params: out as JsonObject, errors };
}