/**
 * @module vesselLabels
 * @description AIS type formatting and shared world-overlay policy retained
 * after the vessel cards moved out of their dedicated canvas renderer.
 */

import { t, msg } from '../i18n/index.js';
import { normalizeVesselType } from './vesselTypes.js';

export { normalizeVesselType };

export const VESSEL_OVERLAY_SOURCE_ID = 'ais-live-vessels';
/** Existing selector grid size; one ambient winner is retained per cell. */
export const VESSEL_LABEL_GRID_PX = 118;
/** Existing environment-default ceiling for ambient vessel rows. */
export const VESSEL_DEFAULT_LABEL_LIMIT = 900;
/** Existing configured absolute ceiling; viewport grid demand is usually lower. */
export const VESSEL_OVERLAY_MAX_COHORT = VESSEL_DEFAULT_LABEL_LIMIT;
/** Existing ambient vessel-card distance fade reaches zero at 5000 km. */
export const VESSEL_CARD_FADE_DISTANCE_M = 5_000_000;
/** Share of VESSEL_CARD_FADE_DISTANCE_M at which ambient cards begin to fade. */
export const VESSEL_CARD_FADE_START_RATIO = 0.7;

/**
 * AIS type family → chevron hue + card accent. Single source of truth for
 * vessel type colors so billboard chevrons and host cards cannot drift apart.
 */
const TYPE_STYLES = [
  { pattern: /tanker/i, css: '#ffb347', accent: '255, 179, 71' },
  {
    pattern: /cargo|container|bulk|carrier/i,
    css: '#39d5ff',
    accent: '57, 213, 255',
  },
  {
    pattern: /passenger|ferry|cruise/i,
    css: '#ff7adf',
    accent: '255, 122, 223',
  },
  { pattern: /fishing/i, css: '#7cff9b', accent: '124, 255, 155' },
  {
    pattern: /tug|tow|pilot|supply|service/i,
    css: '#f7f0a3',
    accent: '247, 240, 163',
  },
];
const DEFAULT_STYLE = { css: '#39d5ff', accent: '57, 213, 255' };

// Card text for the type tokens above. The tokens stay English: TYPE_STYLES
// and tests match on them.
const TYPE_DISPLAY_KEYS = Object.freeze({
  FISHING: msg('FISHING'),
  TOWING: msg('TOWING'),
  DREDGER: msg('DREDGER'),
  'DIVE OPS': msg('DIVE OPS'),
  MILITARY: msg('MILITARY'),
  SAILING: msg('SAILING'),
  PLEASURE: msg('PLEASURE'),
  PILOT: msg('PILOT'),
  SAR: msg('SAR'),
  TUG: msg('TUG'),
  'PORT TENDER': msg('PORT TENDER'),
  'ANTI-POLLUTION': msg('ANTI-POLLUTION'),
  'LAW ENFORCE': msg('LAW ENFORCE'),
  MEDICAL: msg('MEDICAL'),
  'HIGH-SPEED': msg('HIGH-SPEED'),
  PASSENGER: msg('PASSENGER'),
  CARGO: msg('CARGO'),
  TANKER: msg('TANKER'),
  OTHER: msg('OTHER'),
});

/**
 * Card-display form of a normalized AIS type: known tokens translate through
 * the catalog; free-text types and unknown codes render unchanged.
 * @param {string} type Raw AIS type.
 * @returns {string}
 */
export function displayVesselType(type) {
  const normalized = normalizeVesselType(type);
  const key = TYPE_DISPLAY_KEYS[normalized.toUpperCase()];
  return key ? t(key) : normalized;
}

/** AIS ship type → CSS hex hue for the billboard chevron. */
export function vesselTypeCss(type) {
  return styleForType(type).css;
}

/** AIS ship type → "r, g, b" accent string for the host card. */
export function accentForVesselType(type) {
  return styleForType(type).accent;
}

function styleForType(type) {
  const text = normalizeVesselType(type);
  return TYPE_STYLES.find((entry) => entry.pattern.test(text)) || DEFAULT_STYLE;
}

/**
 * Derive the source's ambient cohort from the shipped selector grid. This is
 * an upper bound; the existing greedy 150 px separation usually yields fewer.
 * Selected vessels are protected and do not consume this budget.
 * @param {number} width CSS viewport width.
 * @param {number} height CSS viewport height.
 * @param {number} [rowLimit=900] Configured source row ceiling.
 * @returns {number}
 */
export function vesselOverlayCohortLimit(
  width,
  height,
  rowLimit = VESSEL_DEFAULT_LABEL_LIMIT,
) {
  const w = Number(width);
  const h = Number(height);
  const requested = Number(rowLimit);
  if (!(w > 0) || !(h > 0) || !(requested > 0)) return 0;
  const gridCapacity =
    Math.ceil(w / VESSEL_LABEL_GRID_PX) * Math.ceil(h / VESSEL_LABEL_GRID_PX);
  return Math.min(
    VESSEL_OVERLAY_MAX_COHORT,
    Math.floor(requested),
    gridCapacity,
  );
}

/**
 * Add host-owned layout, fade, collision and paint-lane fields to a formatted
 * vessel card. Ambient and selected cards share `ambient-card`, so the host's
 * protected selected rectangle excludes ambient cards while bypassing quotas.
 * @param {Object} card Source-formatted vessel card.
 * @param {number} [fadeDistance=5000000] Ambient distance-fade endpoint.
 * @returns {Object}
 */
export function applyVesselOverlayPolicy(
  card,
  fadeDistance = VESSEL_CARD_FADE_DISTANCE_M,
) {
  const selected = card?.selected === true;
  const rawGap = Number(card?.gapPx) || 10;
  const gapPx = Math.max(selected ? 28 : 12, rawGap + 8);
  return {
    ...card,
    variant: selected ? 'selected' : 'card',
    protected: selected,
    collisionGroup: 'ambient-card',
    cardStyle: 'tactical',
    gapPx,
    leaderOffsetPx: Math.max(2, gapPx - 6),
    // Selected detail cards may move beside the contact to clear solid panels.
    verticalOnly: !selected,
    viewportMargin: 4,
    maxDistance: selected ? Number.POSITIVE_INFINITY : fadeDistance,
    distanceFadeStartRatio: VESSEL_CARD_FADE_START_RATIO,
    edgeFade: 'keyhole',
    horizonCull: true,
    terrainOcclusion: false,
    // Only MMSI-keyed cards can resolve back to one actionable vessel.
    interactive: card?.actionable === true,
  };
}