/**
 * Planet symbols for the North Indian chart and the chart page planet table.
 *
 * The chart used to print display text inside each house ("水 19°", "罗逆 29°"),
 * which stacked three labels on top of each other whenever a house held three
 * planets. The chart now carries symbols only; degrees, nakshatra and direction
 * live in the planet table under the chart.
 *
 * Colour is an identification aid, not a verdict: nothing here says benefic or
 * malefic. Rahu and Ketu deliberately share one neutral grey.
 *
 * ♀ and ♂ are followed by U+FE0E (VARIATION SELECTOR-15, text presentation).
 * Without it iOS renders both as colour emoji.
 */

export const PLANET_GLYPH_KEYS = [
  "sun",
  "moon",
  "mars",
  "mercury",
  "jupiter",
  "venus",
  "saturn",
  "rahu",
  "ketu",
] as const;

export type PlanetGlyphKey = (typeof PLANET_GLYPH_KEYS)[number];

const TEXT_PRESENTATION = "\uFE0E";

export const PLANET_GLYPH: Readonly<Record<PlanetGlyphKey, string>> = {
  sun: "☉",
  moon: "☽",
  mars: `♂${TEXT_PRESENTATION}`,
  mercury: "☿",
  jupiter: "♃",
  venus: `♀${TEXT_PRESENTATION}`,
  saturn: "♄",
  rahu: "☊",
  ketu: "☋",
};

/** One-character Chinese name, as used in the chart legend. */
export const PLANET_GLYPH_ZH: Readonly<Record<PlanetGlyphKey, string>> = {
  sun: "日",
  moon: "月",
  mars: "火",
  mercury: "水",
  jupiter: "木",
  venus: "金",
  saturn: "土",
  rahu: "罗",
  ketu: "计",
};

/** Full Chinese name, as used in the planet table. */
export const PLANET_NAME_ZH: Readonly<Record<PlanetGlyphKey, string>> = {
  sun: "太阳",
  moon: "月亮",
  mars: "火星",
  mercury: "水星",
  jupiter: "木星",
  venus: "金星",
  saturn: "土星",
  rahu: "北交点",
  ketu: "南交点",
};

export const PLANET_ABBR: Readonly<Record<PlanetGlyphKey, string>> = {
  sun: "Su",
  moon: "Mo",
  mars: "Ma",
  mercury: "Me",
  jupiter: "Ju",
  venus: "Ve",
  saturn: "Sa",
  rahu: "Ra",
  ketu: "Ke",
};

/**
 * Colour modifier per body; both nodes share one. The colours themselves are
 * `--color-planet-*` in globals.css, one value per theme.
 *
 * A class rather than an inline `style`: the personal report's markup contract
 * forbids a `style=` attribute anywhere in the rendered document, and that rule
 * is load-bearing (it is what keeps agent-authored content from carrying its
 * own CSS), so the chart may not be the one exception.
 */
export const PLANET_COLOR_CLASS: Readonly<Record<PlanetGlyphKey, string>> = {
  sun: "is-sun",
  moon: "is-moon",
  mars: "is-mars",
  mercury: "is-mercury",
  jupiter: "is-jupiter",
  venus: "is-venus",
  saturn: "is-saturn",
  rahu: "is-node",
  ketu: "is-node",
};

export const ASCENDANT_COLOR_CLASS = "is-ascendant";
/** The North Indian first house is always the ascendant, so the mark needs no data. */
export const ASCENDANT_MARK = "As";
export const ASCENDANT_NAME_ZH = "上升";

/** Chinese names the engines emit, keyed by their first character. */
const ZH_FIRST_CHARACTER: Readonly<Record<string, PlanetGlyphKey>> = {
  日: "sun",
  太: "sun", // 太阳
  月: "moon",
  火: "mars",
  水: "mercury",
  木: "jupiter",
  金: "venus",
  土: "saturn",
  罗: "rahu", // 罗睺
  计: "ketu", // 计都
};

const EN_NAMES: Readonly<Record<string, PlanetGlyphKey>> = {
  sun: "sun",
  moon: "moon",
  mars: "mars",
  mercury: "mercury",
  jupiter: "jupiter",
  venus: "venus",
  saturn: "saturn",
  rahu: "rahu",
  ketu: "ketu",
};

const ASCENDANT_NAMES = new Set(["as", "asc", "ascendant", "lagna"]);
/** 上升 / 上升点 / 上升星座 — the report's own wording for the same point. */
const ASCENDANT_ZH_PREFIX = "上升";

/**
 * Maps a label to a glyph key. Accepts every spelling the three call sites can
 * produce: the report chart block's one-character names ("水", "罗"), the
 * rectification house table's full Chinese names ("水星", "罗睺"), and the
 * report evidence bundle's English celestial names ("Mercury", "Rahu").
 */
export function planetGlyphKey(name: string): PlanetGlyphKey | null {
  const trimmed = name.trim();
  if (!trimmed) return null;
  const latin = trimmed.match(/^[A-Za-z]+/);
  if (latin) return EN_NAMES[latin[0].toLowerCase()] ?? null;
  return ZH_FIRST_CHARACTER[trimmed[0]!] ?? null;
}

export type ChartOccupant =
  | { kind: "planet"; key: PlanetGlyphKey; retrograde: boolean; label: string }
  | { kind: "ascendant"; label: string }
  | { kind: "text"; label: string };

/**
 * Reads one occupant string. The rectification board and the personal report
 * both receive their house tables as engine/agent display text and have no
 * structured planet list to join against — their contracts are golden-fixture
 * shaped and may not be invented here — so those two routes are parsed.
 * `toNorthIndianChart` instead attaches `occupantGlyphs` and never reaches this.
 */
export function parseChartOccupant(label: string): ChartOccupant {
  const trimmed = label.trim();
  if (!trimmed) return { kind: "text", label };
  if (ASCENDANT_NAMES.has(trimmed.toLowerCase()) || trimmed.startsWith(ASCENDANT_ZH_PREFIX)) {
    return { kind: "ascendant", label: trimmed };
  }
  const key = planetGlyphKey(trimmed);
  if (!key) return { kind: "text", label: trimmed };
  return { kind: "planet", key, retrograde: trimmed.includes("逆"), label: trimmed };
}

/** Reading order for the chart legend: 日 月 水 金 火 木 土 罗 计. */
export const PLANET_LEGEND_ORDER = [
  "sun",
  "moon",
  "mercury",
  "venus",
  "mars",
  "jupiter",
  "saturn",
  "rahu",
  "ketu",
] as const satisfies readonly PlanetGlyphKey[];