// Hand-written mirror of arr-api's series detail, season, episode and
// release schemas — same reasoning as search.ts: the generated client
// (src/api/) is uncommitted, so CI's tsc cannot see it.

import type { MetadataTrailer } from "./movie";
import type {
  ActionOutcome,
  MovieRelease,
  PackStateOutcome,
  ReleasesOutcome,
  WaiveOutcome,
} from "./releases";
import { errorDetail, probedAttributeTags, seasonPackState, waiverOverride } from "./releases";

/** §4.2 derived status — displayed, never editable. */
export type SeriesStatus = "airing" | "incomplete" | "waiting" | "complete" | "ended";

export interface ApiSeries {
  id: number;
  tmdb_id: number;
  title: string;
  year: number | null;
  root_id: number;
  blocked: boolean;
  /** Null until a metadata refresh has stamped it (#160, #177). */
  metadata_refreshed_at: string | null;
  status: SeriesStatus;
  wanted_episodes: number;
  available_episodes: number;
}

export interface ApiEpisode {
  id: number;
  series_id: number;
  season_id: number;
  season_number: number;
  number: number;
  title: string;
  air_date: string | null;
  wanted: boolean;
  state: string;
  /** issue 122: gone upstream while a file of its own remained. */
  vanished: boolean;
}

export interface ApiSeason {
  id: number;
  number: number;
  tracked: boolean;
  /** Gone upstream while a file under it remained — a conflict, not a state. */
  vanished: boolean;
  episodes: ApiEpisode[];
}

export type SeasonsOutcome =
  | { kind: "seasons"; seasons: ApiSeason[] }
  | { kind: "error"; detail: string };

export async function fetchSeries(seriesId: number): Promise<ApiSeries | null> {
  try {
    const response = await fetch(`/api/series/${seriesId}`);
    return response.ok ? ((await response.json()) as ApiSeries) : null;
  } catch {
    return null;
  }
}

/** One episode by row id — the `/episodes/{id}/releases` deep link's lookup. */
export async function fetchEpisode(episodeId: number): Promise<ApiEpisode | null> {
  try {
    const response = await fetch(`/api/episodes/${episodeId}`);
    return response.ok ? ((await response.json()) as ApiEpisode) : null;
  } catch {
    return null;
  }
}

export async function fetchSeasons(seriesId: number): Promise<SeasonsOutcome> {
  try {
    const response = await fetch(`/api/series/${seriesId}/seasons`);
    if (!response.ok) {
      return { kind: "error", detail: await errorDetail(response) };
    }
    return { kind: "seasons", seasons: (await response.json()) as ApiSeason[] };
  } catch {
    return { kind: "error", detail: "daemon unreachable" };
  }
}

/** Issue #177: resend the on-demand refresh a page gave up polling for. */
export async function refreshSeriesMetadata(seriesId: number): Promise<ActionOutcome> {
  try {
    const response = await fetch(`/api/series/${seriesId}/refresh-metadata`, { method: "POST" });
    if (!response.ok) {
      return { kind: "error", detail: await errorDetail(response) };
    }
    return { kind: "done" };
  } catch {
    return { kind: "error", detail: "daemon unreachable" };
  }
}

/** One imported episode file as `/api/series/{id}/files` reports it (§7.4). */
export interface EpisodeFile {
  episode_id: number;
  path: string;
  size: number;
  probed: {
    resolution?: string | null;
    source?: string | null;
    hdr?: string | null;
    audio_tracks?: { language?: string | null }[] | null;
  } | null;
  waiver: string | null;
}

export type SeriesFilesOutcome =
  | { kind: "files"; files: EpisodeFile[] }
  | { kind: "error"; detail: string };

export async function fetchSeriesFiles(seriesId: number): Promise<SeriesFilesOutcome> {
  try {
    const response = await fetch(`/api/series/${seriesId}/files`);
    if (!response.ok) {
      return { kind: "error", detail: await errorDetail(response) };
    }
    return { kind: "files", files: (await response.json()) as EpisodeFile[] };
  } catch {
    return { kind: "error", detail: "daemon unreachable" };
  }
}

/**
 * The season's tracked toggle (§4.1): turning it on marks every revealed
 * episode wanted; turning it off withdraws nothing.
 */
export async function setSeasonTracked(
  seriesId: number,
  seasonNumber: number,
  tracked: boolean,
): Promise<ActionOutcome> {
  try {
    const response = await fetch(`/api/series/${seriesId}/seasons/${seasonNumber}`, {
      method: "PATCH",
      headers: { "content-type": "application/json" },
      body: JSON.stringify({ tracked }),
    });
    if (!response.ok) {
      return { kind: "error", detail: await errorDetail(response) };
    }
    return { kind: "done" };
  } catch {
    return { kind: "error", detail: "daemon unreachable" };
  }
}

export async function setEpisodeWanted(episodeId: number, wanted: boolean): Promise<ActionOutcome> {
  try {
    const response = await fetch(`/api/episodes/${episodeId}`, {
      method: "PATCH",
      headers: { "content-type": "application/json" },
      body: JSON.stringify({ wanted }),
    });
    if (!response.ok) {
      return { kind: "error", detail: await errorDetail(response) };
    }
    return { kind: "done" };
  } catch {
    return { kind: "error", detail: "daemon unreachable" };
  }
}

/* ---- removal (issues 174 + 175) ---------------------------------------- */

/**
 * The §7.4 title folder these episode files share. Season subfolders differ
 * between files, so the shared folder is the one carrying the `[tmdbid-…]`
 * tag every §7.4 title folder name has. `null` when the files disagree,
 * which the panel then says instead of naming one folder falsely.
 */
export function seriesFolder(files: { path: string }[]): string | null {
  const folders = new Set<string>();
  for (const file of files) {
    const parts = file.path.split("/");
    const titleAt = parts.findIndex((part) => part.includes("[tmdbid-"));
    const folder =
      titleAt > 0
        ? parts.slice(0, titleAt + 1).join("/")
        : file.path.slice(0, file.path.lastIndexOf("/"));
    if (folder === "") {
      return null;
    }
    folders.add(folder);
  }
  if (folders.size !== 1) {
    return null;
  }
  return [...folders][0] ?? null;
}

/**
 * Remove the series from the library. The row and its §7.4 title folder go.
 * Torrents keep seeding — the reaper owns that lifecycle (§7.3).
 */
export function removeSeries(seriesId: number): Promise<ActionOutcome> {
  return del(`/api/series/${seriesId}`);
}

/**
 * #174: the season's files go and its episodes stop being wanted. The season
 * stays listed — TMDB owns that metadata and the next refresh would recreate
 * it anyway.
 */
export function removeSeasonFiles(seriesId: number, seasonNumber: number): Promise<ActionOutcome> {
  return del(`/api/series/${seriesId}/seasons/${seasonNumber}/files`);
}

/** #174, one episode: the file goes and the episode stops being wanted. */
export function removeEpisodeFiles(episodeId: number): Promise<ActionOutcome> {
  return del(`/api/episodes/${episodeId}/files`);
}

async function del(url: string): Promise<ActionOutcome> {
  try {
    const response = await fetch(url, { method: "DELETE" });
    if (!response.ok) {
      return { kind: "error", detail: await errorDetail(response) };
    }
    return { kind: "done" };
  } catch {
    return { kind: "error", detail: "daemon unreachable" };
  }
}

/* ---- manual triggers and decks ---------------------------------------- */

/** §6.2 manual search, one targeted sweep, for a season or an episode. */
export interface TvTarget {
  releases: () => Promise<ReleasesOutcome>;
  grab: (releaseId: number) => Promise<ActionOutcome>;
  search: () => Promise<ActionOutcome>;
  /**
   * Why the deck is empty (#182). Seasons only: an episode deck has one
   * lane, so it has nothing to disambiguate.
   */
  packState?: () => Promise<PackStateOutcome>;
}

export function seasonTarget(seriesId: number, seasonNumber: number): TvTarget {
  const base = `/api/series/${seriesId}/seasons/${seasonNumber}`;
  return {
    releases: () => fetchJson(`${base}/releases`),
    grab: (releaseId) => post(`${base}/releases/${releaseId}/grab`),
    search: () => post(`${base}/search`),
    packState: () => seasonPackState(seriesId, seasonNumber),
  };
}

export function episodeTarget(episodeId: number): TvTarget {
  const base = `/api/episodes/${episodeId}`;
  return {
    releases: () => fetchJson(`${base}/releases`),
    grab: (releaseId) => post(`${base}/releases/${releaseId}/grab`),
    search: () => post(`${base}/search`),
  };
}

async function fetchJson(url: string): Promise<ReleasesOutcome> {
  try {
    const response = await fetch(url);
    if (!response.ok) {
      return { kind: "error", detail: await errorDetail(response) };
    }
    return { kind: "results", releases: (await response.json()) as MovieRelease[] };
  } catch {
    return { kind: "error", detail: "daemon unreachable" };
  }
}

async function post(url: string): Promise<ActionOutcome> {
  try {
    const response = await fetch(url, { method: "POST" });
    if (!response.ok) {
      return { kind: "error", detail: await errorDetail(response) };
    }
    return { kind: "done" };
  } catch {
    return { kind: "error", detail: "daemon unreachable" };
  }
}

/**
 * The one-click override on a waived TV row (§5.1, §9.3). Overrides sit on
 * the series — `episode_policy` and `season_policy` both read them there —
 * so the relaxed rule is written once, then the grab proceeds.
 */
export async function waiveAndGrabTv(
  seriesId: number,
  target: TvTarget,
  releaseId: number,
  rule: string | null,
): Promise<WaiveOutcome> {
  const override = waiverOverride(rule);
  let overrideWritten = false;
  if (override) {
    try {
      const current = await fetch(`/api/series/${seriesId}`);
      if (!current.ok) {
        return { kind: "error", detail: await errorDetail(current), overrideWritten };
      }
      const series = (await current.json()) as { overrides: Record<string, unknown> };
      const patch = await fetch(`/api/series/${seriesId}`, {
        method: "PATCH",
        headers: { "content-type": "application/json" },
        body: JSON.stringify({ overrides: { ...series.overrides, ...override } }),
      });
      if (!patch.ok) {
        return { kind: "error", detail: await errorDetail(patch), overrideWritten };
      }
      overrideWritten = true;
    } catch {
      return { kind: "error", detail: "daemon unreachable", overrideWritten };
    }
  }
  const grabbed = await target.grab(releaseId);
  if (grabbed.kind === "error") {
    return { kind: "error", detail: grabbed.detail, overrideWritten };
  }
  return { kind: "done", overrideWritten };
}

/* ---- §9.6 rich detail --------------------------------------------------- */

/** Rich detail for one library series' §9.6 page (#146). */
export interface SeriesMetadata {
  tmdb_id: number;
  overview: string | null;
  tagline: string | null;
  genres: string[];
  /** Minutes per episode. */
  runtime: number | null;
  status: string;
  poster_path: string | null;
  backdrop_path: string | null;
  /** `null` when TMDB has no votes for the title (#156). */
  vote_average: number | null;
  vote_count: number;
  homepage: string | null;
  /** §9.6 links out to TVDB for series; absent when the id is unknown. */
  tvdb_id: number | null;
  trailer: MetadataTrailer | null;
}

export type SeriesMetadataOutcome =
  | { kind: "metadata"; metadata: SeriesMetadata }
  | { kind: "error"; detail: string };

/** One request for everything above the season tree (§9.6). */
export async function seriesMetadata(seriesId: number): Promise<SeriesMetadataOutcome> {
  try {
    const response = await fetch(`/api/series/${seriesId}/metadata`);
    if (!response.ok) {
      return { kind: "error", detail: await errorDetail(response) };
    }
    return { kind: "metadata", metadata: (await response.json()) as SeriesMetadata };
  } catch {
    return { kind: "error", detail: "daemon unreachable" };
  }
}

/* ---- display helpers --------------------------------------------------- */

/** Wanted / on-disk counts for one season, whatever its number. */
export function seasonCounts(season: ApiSeason): { wanted: number; available: number } {
  let wanted = 0;
  let available = 0;
  for (const episode of season.episodes) {
    if (episode.wanted) {
      wanted += 1;
      if (episode.state === "available") {
        available += 1;
      }
    }
  }
  return { wanted, available };
}

/**
 * §6.2: do not search before the thing exists. No air date yet counts as
 * not aired — TMDB has not dated it, so neither will we.
 */
export function isUnaired(airDate: string | null, now = new Date()): boolean {
  if (airDate === null) {
    return true;
  }
  const parsed = Date.parse(airDate);
  if (Number.isNaN(parsed)) {
    return true;
  }
  const today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
  return parsed > today.getTime() + 86_399_999;
}

/** `2026-08-10` as the readout spells it; unknown stays a dash. */
export function formatAirDate(airDate: string | null): string {
  return airDate ?? "—";
}

/** The probed attributes an episode file row shows as chips (§5.6, §7.4). */
export function fileAttributeTags(file: EpisodeFile): string[] {
  return probedAttributeTags(file.probed);
}