/**
 * CLASS MODEL — the pure reads over the class roster (data/classes.json).
 *
 * No Phaser, no scene: the same contract as js/ship/ShipScreenModel.js and
 * js/combat/Weapons.js, so dev/classes.test.mjs exercises exactly this in
 * bare Node and every screen (the select console, the ship console's class
 * plate, the combat system's firing code) reads ONE definition of a class.
 *
 * The split: data/classes.json owns the labels, the accents, the insignia
 * frame indices, the overview copy and the perk numbers; this module owns
 * the shape — normalizing whatever the data says into records the UI and
 * the combat code can rely on (a malformed entry is dropped, never
 * propagated; every read has a fallback).
 *
 * THE DOOR LEVEL is NOT restated here: `classAt` lives in
 * data/shipScreen.json → level.classAt (the ship console's journey plate
 * and the class trigger read the same number — one source).
 *
 * A CLASS RECORD (classDef / classList):
 *   { id, label, accent, frame, role, tagline, summary, overview: string[],
 *     skillPoints: int, perks: [perkRecord] }
 * A PERK RECORD (perkDef):
 *   { id, label, note, ...the perk's own numbers }
 */
import { config } from '../config/Config.js';

/** The class-insignia texture key (one sheet, cached game-wide). */
export const CLASS_ICON_KEY = 'class_icons';

const str = (v, fb = '') => (typeof v === 'string' && v.trim() ? v : fb);

/** A CSS/int color → the int Graphics + Phaser text both want. */
function toInt(v, fb) {
  if (typeof v === 'number' && Number.isFinite(v)) return v >>> 0;
  const s = String(v ?? '').trim().replace('#', '');
  if (!/^[0-9a-fA-F]{6}$/.test(s)) return fb;
  return parseInt(s, 16) >>> 0;
}

/** Is the class layer on at all (data/classes.json → enabled)? */
export function classesEnabled() {
  return config.get('classes.enabled', true) !== false;
}

/** The combat level a class is earned at — data/shipScreen.json → level.classAt. */
export function classAt() {
  const n = Number(config.get('shipScreen.level.classAt', 5));
  return Number.isFinite(n) ? Math.max(1, Math.round(n)) : 5;
}

/** The insignia sheet's config (texture + frame size). */
export function iconSheet() {
  const cfg = config.section('classes.icons', {});
  return {
    texture: str(cfg.texture, 'assets/images/classes.png'),
    frameWidth: Math.max(1, Math.round(Number(cfg.frameWidth) || 128)),
    frameHeight: Math.max(1, Math.round(Number(cfg.frameHeight) || 128)),
  };
}

/**
 * One perk record (data/classes.json → perks[id]). The definition carries
 * its own mechanics numbers (dualCannon.barrels / barrelOffset,
 * targetingComputer.maxLead) so combat reads them here, never hardcoded.
 * @param {string} id the perk id a class lists in bonuses.perks
 * @returns {object|null} null for an unknown id
 */
export function perkDef(id) {
  const key = str(id);
  if (!key) return null;
  const table = config.section('classes.perks', {});
  const def = table[key];
  if (!def || typeof def !== 'object') return null;
  return { id: key, label: str(def.label, key).toUpperCase(), note: str(def.note), ...def };
}

/** The perk records a class's initial bonus grants (unknown ids drop). */
export function perksFor(id) {
  const def = classDef(id);
  if (!def) return [];
  return def.perks;
}

/**
 * One class record (data/classes.json → classes[id]).
 * @param {string} id a class id ('vanguard', 'wraith')
 * @returns {object|null} null when the roster has no such class
 */
export function classDef(id) {
  const key = String(id ?? '').trim().toLowerCase();
  if (!key) return null;
  return classList().find((c) => c.id === key) ?? null;
}

/**
 * EVERY class offered, in data order (the tab order). An entry without a
 * usable id is skipped — a half-authored class never shows as a dead tab.
 * @returns {Array<object>} the normalized roster ([] when the layer is off)
 */
export function classList() {
  if (!classesEnabled()) return [];
  const rows = config.get('classes.classes', []);
  if (!Array.isArray(rows)) return [];
  const out = [];
  for (const row of rows) {
    const id = str(row?.id).toLowerCase();
    if (!id) continue;
    const bonuses = row.bonuses && typeof row.bonuses === 'object' ? row.bonuses : {};
    const perkIds = Array.isArray(bonuses.perks) ? bonuses.perks : [];
    const perks = perkIds.map((p) => perkDef(p)).filter(Boolean);
    const overview = Array.isArray(row.overview)
      ? row.overview.map((p) => str(p)).filter(Boolean)
      : [];
    out.push({
      id,
      label: str(row.label, id).toUpperCase(),
      accent: toInt(row.accent, 0x00e5ff),
      accentCss: typeof row.accent === 'string' && row.accent.trim() ? row.accent.trim() : '#00e5ff',
      frame: Math.max(0, Math.floor(Number(row.frame) || 0)),
      role: str(row.role).toUpperCase(),
      tagline: str(row.tagline).toUpperCase(),
      summary: str(row.summary),
      overview,
      skillPoints: Math.max(0, Math.floor(Number(bonuses.skillPoints) || 0)),
      perks,
    });
  }
  return out;
}

/** The perk LABELS a class grants, joined for the toast / confirm line. */
export function perkNames(id, sep = ' + ') {
  return perksFor(id)
    .map((p) => p.label)
    .join(sep);
}

/** The insignia frame index of a class (null when the class is unknown). */
export function iconFrame(id) {
  const def = classDef(id);
  return def ? def.frame : null;
}

/**
 * The select console's briefing (data/classes.json → window.intro +
 * window.speech). `text` is Trestle's copy verbatim from the data.
 */
export function introSpec() {
  const win = config.section('classes.window', {});
  const intro = win.intro ?? {};
  const speech = win.speech ?? {};
  return {
    speaker: str(intro.speaker, 'TRESTLE'),
    role: str(intro.role).toUpperCase(),
    text: str(intro.text),
    hint: str(intro.hint).toUpperCase(),
    caret: intro.caret !== false,
    audio: str(speech.file),
    musicDuck: Number.isFinite(Number(speech.musicDuck)) ? Number(speech.musicDuck) : 0.25,
    backLabel: str(intro.backLabel, '◂ BRIEFING').toUpperCase(),
  };
}

/** The window's own copy + knobs (data/classes.json → window). */
export function windowSpec() {
  const win = config.section('classes.window', {});
  return {
    title: str(win.title, 'CLASS SELECT'),
    meta: str(win.meta),
    // the little stamp under the left feed (the console's own shelf label)
    feedLine: str(win.feedLine, 'CLASS DOCTRINE // LV {classAt}'),
    video: {
      file: str(win.video?.file, 'classes.mp4'),
      aspect: Array.isArray(win.video?.aspect) ? win.video.aspect : [2, 3],
      tag: str(win.video?.tag).toUpperCase(),
      noSignalTag: str(win.video?.noSignalTag, 'FEED OFFLINE').toUpperCase(),
    },
    tabs: {
      iconSize: Math.max(0, Number(win.tabs?.iconSize) || 26),
      height: Math.max(30, Number(win.tabs?.height) || 46),
    },
    plate: win.classPlate ?? {},
    pick: win.pick ?? {},
    toasts: {
      alreadyChosen: str(win.alreadyChosenToast),
      success: str(win.successToast),
      defer: str(win.deferToast),
    },
    sfx: {
      lock: str(win.lockSfx, 'ui_window'),
      success: str(win.lockSuccessSfx, 'discovery'),
    },
  };
}

/**
 * The template fill the confirm / toast lines use — `{class}`, `{perks}`,
 * `{skillPoints}` (an unknown placeholder is left alone, so a typo in the
 * data never prints "undefined").
 */
export function fillTemplate(str_, map = {}) {
  return String(str_ ?? '').replace(/\{(\w+)\}/g, (m, k) =>
    (map[k] === undefined || map[k] === null ? m : String(map[k])),
  );
}

/**
 * The confirm dialog's copy for one class (data/classes.json → window.pick).
 * @param {string} id the class about to be locked in
 */
export function confirmSpec(id) {
  const def = classDef(id);
  const pick = windowSpec().pick;
  const map = {
    class: def?.label ?? String(id ?? '').toUpperCase(),
    perks: perkNames(id),
    skillPoints: def?.skillPoints ?? 0,
    frame: def?.frame ?? 0,
  };
  return {
    title: fillTemplate(pick.title, map),
    line1: fillTemplate(pick.line1, map),
    line2: fillTemplate(pick.line2, map),
    confirmLabel: str(pick.confirmLabel, 'CONFIRM'),
    cancelLabel: str(pick.cancelLabel, 'CANCEL'),
    width: Number(pick.width) || 520,
    height: Number(pick.height) || 196,
    accent: def?.accentCss ?? '#00e5ff',
  };
}

/** The lock-in toast's copy for one class. */
export function successMessage(id) {
  const spec = windowSpec();
  return fillTemplate(spec.toasts.success, {
    class: classDef(id)?.label ?? String(id ?? '').toUpperCase(),
    perks: perkNames(id),
    skillPoints: classDef(id)?.skillPoints ?? 0,
  });
}