import type { ResolvedPart, ResolvedText } from './types';
import type { Commemoration, DayWinner, LiturgicalDay } from '../calendar/types';
import type { ProperText } from '../propers';
import { getCommonProper, getTemporalProper } from '../propers';
import { getSaintRecord } from '../calendar/feasts';
import { resolveActiveOctave, isAtLeast } from '../calendar';
import { splitAntiphon } from './antiphon';

function toResolvedText(proper: ProperText): ResolvedText {
  return { text: proper.text, status: proper.status, citation: proper.citation };
}

/** Shared by every hour's resolver — looks up a common proper by id and
 * shapes it as a ResolvedText. */
export function resolveCommon(id: string): ResolvedText {
  return toResolvedText(getCommonProper(id));
}

// Named temporal winners with real standing of their own, unconditionally
// override-eligible — see hours/lauds.ts's getPsalmodyOverrideFor, which
// shares this set (imported from here, not duplicated) since it's the
// same "does this temporal identity carry its own real office" question.
export const ALWAYS_OVERRIDE_TEMPORAL_IDS = new Set(['marian-saturday', 'christ-the-king']);

/**
 * Which identity's own propers actually supply the office's content
 * (collect, Benedictus antiphon, psalmody override) — usually just
 * `day.winner`, but *not* on a day within an active octave where the
 * temporal day itself has no real standing of its own (`ordinary-feria`)
 * and the winner stayed temporal — an ordinary day within St. Lawrence's
 * own octave, e.g.: live-verified (Tridentine 1910, 2026-08-12) that the
 * chapter/responsory/hymn/versicle, psalms' antiphons, Benedictus
 * antiphon, and day collect all come from the octave's own feast
 * ("{ex Commune aut Festo}" / "{ex Proprio Sanctorum}"), not from the
 * plain temporal day underneath it.
 *
 * Deliberately gated on `ordinary-feria` specifically, not just "an
 * octave is active": the Christmas Octave's own stacked octaves
 * (Christmas + Stephen + John + Holy Innocents, e.g. on Dec 30) are the
 * live-verified counterexample — that day's own temporal identity
 * ("Dominica Infra Octavam Nativitatis", `privileged-feria-minor`) is
 * itself a real, named standing, and *keeps* the office
 * ("{ex Proprio de Tempore}"); the four octaves there each become their
 * own separate "Commemoratio Octavæ ..." block instead (not yet modeled
 * — see TODO.md), rather than any one of them taking over content the
 * way Lawrence's octave does. The dividing line is real standing, not
 * merely "is an octave active."
 *
 * `day.winner`/`day.commemorations` themselves stay exactly as
 * calendar/index.ts computed them either way — this is purely a
 * content-lookup detail, not a recomputation of who "wins." Picks the
 * oldest-started active octave with an authored saint record
 * (activeOctavesFor's own ordering) — matches calendar/day-label.ts's
 * same choice for the display label, for the same reason.
 */
export function resolveOfficeWinner(day: LiturgicalDay): DayWinner {
  if (day.winner.kind === 'sanctoral' || ALWAYS_OVERRIDE_TEMPORAL_IDS.has(day.winner.id)) {
    return day.winner;
  }
  if (day.temporalCategory !== 'ordinary-feria') {
    return day.winner;
  }
  // When more than one octave is active at once (St. Lawrence's and the
  // Assumption's genuinely overlap every Aug 16-17), resolveActiveOctave
  // picks the one that actually governs the day — see its own doc
  // comment for the precedence rule. Falls through to the plain temporal
  // default if that octave turns out to be a temporal-only one with no
  // saint record (e.g. Christmas's or Pentecost's own octave id) — no
  // sanctoral content to synthesize from those.
  const activeOctave = resolveActiveOctave(day.date);
  if (activeOctave) {
    const saint = getSaintRecord(activeOctave.id);
    if (saint) {
      return { kind: 'sanctoral', id: saint.id, name: saint.name, rank: saint.rank };
    }
  }
  return day.winner;
}

/** Like calendar/index.ts's own isSundayOrFeast, but resolveOfficeWinner-
 * aware — an octave day counts as a "feast" for this purpose too.
 * Live-verified: Prime's capitulum/Preces stay in the Sunday/feast form
 * throughout St. Lawrence's octave (2026-08-12), not just his own actual
 * day (2026-08-10) — both show the identical "ex Psalterio secundum
 * diem" 1 Tim 1:17 text. Deliberately a separate function, not a
 * replacement for the plain isSundayOrFeast: Lauds' own Cross-suffrage
 * gate (hours/lauds.ts) needs the *narrower*, non-office-aware version,
 * since Marian Saturday and an octave day both need to land on the
 * ferial side there despite not being Sunday or a sanctoral `day.winner`
 * either. */
export function isSundayOrFeastOffice(day: LiturgicalDay): boolean {
  return day.weekday === 'sunday' || resolveOfficeWinner(day).kind === 'sanctoral';
}

/**
 * Whether today's office winner (resolveOfficeWinner) is a strong enough
 * feast to carry its own proper minor-hour content (antiphon + chapter)
 * — duplex-majus+, the same threshold Lauds' own psalmody override uses
 * (hours/lauds.ts's getPsalmodyOverrideFor), kept in sync deliberately:
 * as each remaining duplex-majus+ saint gets a Lauds override authored,
 * the same id is what Prime/Terce/Sext/None would look for too, so it's
 * one shared backlog (see TODO.md), not per-hour lists that can drift.
 * Returns the id to look up (`${hourId}-antiphon-${id}` etc.), or
 * `undefined` when nothing eligible is happening today.
 */
export function getMinorHourOverrideId(day: LiturgicalDay): string | undefined {
  const winner = resolveOfficeWinner(day);
  if (winner.kind === 'sanctoral' && isAtLeast(winner.rank, 'duplex-majus')) {
    return winner.id;
  }
  return undefined;
}

/** A Little Hour's (or Prime's) plain per-weekday antiphon, overridden by
 * a duplex-majus+ feast's own proper (`${hourId}-antiphon-${id}`) when
 * authored — same honest "not gated behind whether content exists, just
 * eligible to override at all" fallback as every other override in this
 * codebase: an eligible feast without one authored yet just falls
 * through to the plain weekday default silently. */
export function resolveMinorHourAntiphon(
  hourId: string,
  day: LiturgicalDay,
  weekdayDefault: Partial<Record<string, string>>,
): Partial<Record<string, string>> {
  const overrideId = getMinorHourOverrideId(day);
  if (overrideId) {
    const proper = getCommonProper(`${hourId}-antiphon-${overrideId}`);
    if (proper.status.la !== 'missing' || proper.status.en !== 'missing') {
      return proper.text;
    }
  }
  return weekdayDefault;
}

/** Same idea as resolveMinorHourAntiphon, for the chapter
 * (`${hourId}-capitulum-${id}`) — falls back to `fallbackId` (the plain
 * per-annum/per-weekday one already in place for that hour) when no
 * override is eligible, or none has been authored yet for one that is. */
export function resolveMinorHourChapter(hourId: string, day: LiturgicalDay, fallbackId: string): ResolvedText {
  const overrideId = getMinorHourOverrideId(day);
  if (overrideId) {
    const proper = resolveCommon(`${hourId}-capitulum-${overrideId}`);
    if (proper.status.la !== 'missing' || proper.status.en !== 'missing') {
      return proper;
    }
  }
  return resolveCommon(fallbackId);
}

/**
 * The day's own collect — real for the vast majority of days (a temporal
 * winner always resolves, since all 52 Sunday collects are authored and
 * ferias inherit the governing Sunday's via calendar/temporal-id.ts), and
 * honestly "missing" for the handful of days a saint wins outright until
 * that saint's own propers are authored (`saints/<id>.yml`'s `propers`
 * field is still `null` for all of them today) — same "resolve as
 * pending" convention as everywhere else, not a special case to handle.
 * Uses resolveOfficeWinner, not the raw `day.winner` — see its own doc
 * comment for why those two differ on an octave day.
 */
export function getDayCollect(day: LiturgicalDay): ResolvedText {
  const winner = resolveOfficeWinner(day);
  if (winner.kind === 'temporal') {
    return toResolvedText(getTemporalProper(`${winner.id}-collect`));
  }
  const saint = getSaintRecord(winner.id);
  if (saint?.propers) {
    return resolveCommon(`${saint.propers}-collect`);
  }
  return { text: {}, status: { la: 'missing', en: 'missing' } };
}

/** A sanctoral commemoration's own rendering: the fuller Ant+V/R+collect
 * bundle (`${propers}-commemoration`, e.g. st-clare-commemoration.yml)
 * when authored — live-verified this is the real shape a commemoration
 * takes, not a bare collect — falling back to just the collect alone
 * (still labeled, unlike the old unlabeled bare-collect rendering this
 * replaces) when only that's been authored, and to an honestly labeled
 * "missing" block when neither has. Always labeled ("Commemoration of St.
 * X") so an unauthored one reads as "this saint's commemoration isn't
 * written up yet," not as a mystery blank prayer. */
function sanctoralCommemorationPart(commemoration: Extract<Commemoration, { kind: 'sanctoral' }>): ResolvedPart {
  const label = `Commemoration of ${commemoration.name}`;
  const saint = getSaintRecord(commemoration.id);
  if (saint?.propers) {
    const combined = resolveCommon(`${saint.propers}-commemoration`);
    if (combined.status.la !== 'missing' || combined.status.en !== 'missing') {
      return { kind: 'preces', text: combined, label };
    }
    return { kind: 'preces', text: resolveCommon(`${saint.propers}-collect`), label };
  }
  return { kind: 'preces', text: { text: {}, status: { la: 'missing', en: 'missing' } }, label };
}

/**
 * The day's own collect, plus one more per commemoration (calendar/
 * types.ts's LiturgicalDay.commemorations) — Lauds/Vespers say all of
 * these in sequence, unlike the Little Hours' single getDayCollect.
 *
 * Simplification, not yet corrected: real practice compresses this into
 * one "Orémus" and lets only the *last* collect close with the full
 * doxology, with earlier ones trailing straight into the next ("And:").
 * Each collect file (data/propers/temporal/*-collect.yml, the per-saint
 * *-collect.yml files) already bakes in its own "Orémus."/"Per Dóminum...
 * Amen." for the single-collect case every other hour uses today, and
 * stripping that back out per-collect to chain them properly would need
 * text surgery this doesn't attempt — so on a commemorated day, each
 * collect here renders as its own complete, separate block instead. An
 * octave commemoration never contributes anything of its own here — once
 * resolveOfficeWinner is in play, its content is already the primary
 * collect above, so a separate entry would just be a redundant repeat.
 */
export function getDayCollects(day: LiturgicalDay): ResolvedPart[] {
  const parts: ResolvedPart[] = [{ kind: 'prayer', text: getDayCollect(day) }];
  for (const commemoration of day.commemorations) {
    if (commemoration.kind === 'temporal') {
      parts.push({ kind: 'prayer', text: toResolvedText(getTemporalProper(`${commemoration.id}-collect`)) });
    } else if (commemoration.kind === 'sanctoral') {
      parts.push(sanctoralCommemorationPart(commemoration));
    }
  }
  return parts;
}

/**
 * Lauds' Benedictus antiphon, resolved the same way as getDayCollect: a
 * per-saint `${propers}-antiphon` (already authored during the sanctoral
 * pull, sourced from each saint's own raw [Ant 1] — see e.g.
 * st-lawrence-antiphon.yml) for a sanctoral winner, `${id}-benedictus-
 * antiphon` (not authored yet for any temporal id — resolves "missing",
 * same pending convention as everywhere else) for a temporal one. Uses
 * resolveOfficeWinner, not the raw `day.winner` — on an octave day this
 * is the octave's own feast's antiphon (live-verified: St. Lawrence's
 * "In cratícula", not the commemorated St. Clare's, and not the plain
 * temporal day's), not a *commemorated* saint's, which is a separate,
 * weaker standing (see getDayCollects/sanctoralCommemorationPart).
 */
export function getBenedictusAntiphon(day: LiturgicalDay): ResolvedText {
  const winner = resolveOfficeWinner(day);
  if (winner.kind === 'temporal') {
    return toResolvedText(getTemporalProper(`${winner.id}-benedictus-antiphon`));
  }
  const saint = getSaintRecord(winner.id);
  if (saint?.propers) {
    return resolveCommon(`${saint.propers}-antiphon`);
  }
  return { text: {}, status: { la: 'missing', en: 'missing' } };
}

export function verifiedText(text: Partial<Record<string, string>>): ResolvedText {
  const status: Partial<Record<string, 'verified'>> = {};
  for (const lang of Object.keys(text)) {
    status[lang] = 'verified';
  }
  return { text, status };
}

const STATUS_RANK = { verified: 0, draft: 1, missing: 2 } as const;

/** Joins a hymn's body with its (seasonally-variable) final doxology
 * stanza, per language — status is the worse of the two per language. */
export function appendDoxology(body: ResolvedText, doxology: ResolvedText): ResolvedText {
  const text: Partial<Record<string, string>> = { ...body.text };
  const status: Partial<Record<string, 'verified' | 'draft' | 'missing'>> = { ...body.status };
  for (const lang of Object.keys(doxology.text)) {
    const doxText = doxology.text[lang];
    if (doxText) {
      text[lang] = text[lang] ? `${text[lang]}\n\n${doxText}` : doxText;
    }
    const bodyStatus = status[lang] ?? 'missing';
    const doxStatus = doxology.status[lang] ?? 'missing';
    status[lang] = STATUS_RANK[doxStatus] > STATUS_RANK[bodyStatus] ? doxStatus : bodyStatus;
  }
  return { text, status };
}

/** Splits a bilingual antiphon (one string per language, each with an
 * embedded "*") into its incipit and full forms, per language — each
 * prefixed "Ant. " inline, the same way "V."/"R." are baked directly into
 * versicle text rather than rendered as a separate UI marker. */
export function splitNamedAntiphon(text: Partial<Record<string, string>>): {
  incipit: ResolvedText;
  full: ResolvedText;
} {
  const incipitText: Partial<Record<string, string>> = {};
  const fullText: Partial<Record<string, string>> = {};
  for (const [lang, t] of Object.entries(text)) {
    if (!t) {
      continue;
    }
    const split = splitAntiphon(t);
    incipitText[lang] = `Ant. ${split.incipit}`;
    fullText[lang] = `Ant. ${split.full}`;
  }
  return { incipit: verifiedText(incipitText), full: verifiedText(fullText) };
}