// PROCITY Lane B — fixture_plan.js
// A hand-authored CityPlan (CITY_SPEC schema v1) so the streetscape is buildable *before*
// Lane A ships generatePlan(). Everything here is deterministic layout math (no Math.random,
// no THREE) — pure JSON-serialisable data. When Lane A lands, index.html swaps in
// generatePlan(seed) and this file becomes the fallback + schema reference.
//
// LAYOUT (metres, +Y up, ground = XZ, origin = centre of the main square):
//
//                         north (backstreets: houses up the cross street)
//                                        │ cross st (X=0)
//        NW shops (Z=+11, face −Z) ──────┼────── NE shops
//        ═══════════════ MAIN STREET (Z=0, east-west) ═══════════════
//        SW shops (Z=−11, face +Z) ──────┼────── SE shops
//
// Orientation convention (documented once, obeyed by buildings.js):
//   A lot is an oriented rectangle centred (x,z), footprint w (frontage) × d (depth).
//   `ry` rotates the building about +Y. At ry=0 the shopfront outward-normal is +Z.
//   Rotation by ry maps +Z → (sin ry, 0, cos ry), so:
//     front faces +Z  → ry = 0        (south side of an E-W street)
//     front faces −Z  → ry = π        (north side of an E-W street)
//     front faces +X  → ry = +π/2     (west side of a N-S street)
//     front faces −X  → ry = −π/2     (east side of a N-S street)

import { rng, pick, irange } from '../core/prng.js';

// ── Shop-type registry (Lane A owns web/js/core/registry.js; it hasn't landed yet, so Lane B
//    carries the slice it needs. facade pools are the CITY_SPEC table. Lane F reconciles.) ──
export const SHOP_REGISTRY = {
  record:  { facades: ['timber-teal', 'arcade-tile', 'djsim-record'], signBg: '#1f2e2b', signFg: '#e8d9a0' },
  opshop:  { facades: ['weatherboard', 'fibro-blue', 'djsim-opshop'], signBg: '#2c2820', signFg: '#f0e2c0' },
  toy:     { facades: ['stucco-pink', 'deco-pastel'],                 signBg: '#7a1f5a', signFg: '#ffe6f2' },
  book:    { facades: ['federation', 'sandstone'],                    signBg: '#2a231a', signFg: '#f3e6c4' },
  video:   { facades: ['stripmall', 'djsim-video'],                   signBg: '#141a2c', signFg: '#8fb7ff' },
  pawn:    { facades: ['besser', 'grimy', 'djsim-pawn'],              signBg: '#f5c400', signFg: '#c1121f' },
  milkbar: { facades: ['djsim-milkbar', 'brickveneer'],              signBg: '#b21f1f', signFg: '#fff3d6' },
  dept:    { facades: ['terrazzo', 'djsim-dept'],                     signBg: '#20313a', signFg: '#ffd75e' },
  stall:   { facades: ['market'],                                    signBg: '#2c2820', signFg: '#f0e2c0' },
};
export const SHOP_TYPES = Object.keys(SHOP_REGISTRY);

// Parody-name word banks (kept small; deterministic pick per shop). 90s-AU flavour.
const NAME_BANK = {
  record:  { a: ['Groove', 'Wax', 'Vinyl', 'Spin', 'Needle', 'Rotary'], b: ['Junction', 'Merchants', 'Traders', 'Exchange', 'Bin'] },
  opshop:  { a: ['Vinnies', 'Salvos', 'Second', 'Thrifty', 'Endeavour', 'Lifeline'], b: ['Chance', 'Op Shop', 'Finds', 'Bazaar', 'Nook'] },
  toy:     { a: ['Toyworld', 'Kiddie', 'Wonder', 'Bright', 'Jolly'], b: ['Toys', 'Playtime', 'Corner', 'Emporium'] },
  book:    { a: ['Dog-Eared', 'Second Story', 'Turning', 'Foxed', 'Marginalia'], b: ['Books', 'Book Barn', 'Reads', 'Pages'] },
  video:   { a: ['Blockheads', 'Video', 'Reel', 'Nightowl', 'Civic'], b: ['Video', 'Rental', 'Ezy Hire', 'Movies'] },
  pawn:    { a: ['Cash', 'Quick', 'Second Chance', 'City', 'Honest'], b: ['Converters', 'Pawn', 'Loans', 'Traders'] },
  milkbar: { a: ['Corner', 'Lucky', 'Rio', 'Astoria', 'Sunny'], b: ['Milk Bar', 'Deli', 'Cafe', 'Store'] },
  dept:    { a: ['Coles', 'Waltons', 'Grace Bros', 'Fossey’s', 'Venture'], b: ['Variety', 'Department', 'Emporium', ''] },
  stall:   { a: ['Trash & Treasure', 'Sunday', 'Boot', 'Market'], b: ['Stall', 'Table', 'Trestle'] },
};

function makeName(seed, type) {
  const r = rng(seed, 'name', 0);
  const bank = NAME_BANK[type] || NAME_BANK.opshop;
  const a = pick(r, bank.a), b = pick(r, bank.b);
  return b ? `${a} ${b}`.trim() : a;
}

// Deterministic hours: most open 9–5-ish, some late, a few closed-feeling.
function makeHours(seed) {
  const r = rng(seed, 'hours', 0);
  const open = irange(r, 7, 10);
  const close = irange(r, 16, 21);
  return [open, close];
}

// Facade skin for a shop, seeded from its type pool.
function pickFacade(seed, type) {
  const r = rng(seed, 'facade', 0);
  return pick(r, (SHOP_REGISTRY[type] || SHOP_REGISTRY.opshop).facades);
}

// ── Geometry constants for the fixture town ──
const W = 8;            // terraced shop frontage width (m)
const D = 8;            // shop depth (m)
const N_FRONT = 11;     // north-side frontage plane Z (fronts face −Z)
const S_FRONT = -11;    // south-side frontage plane Z (fronts face +Z)
const CROSS_W = -11;    // cross-street west frontage plane X (fronts face +X)
const CROSS_E = 11;     // cross-street east frontage plane X (fronts face −X)

// The terraced blocks. Four along the north frontage + two on the south near the plaza, spread so
// the main street spans ~6 chunks (streaming visibly kicks in walking end-to-end). Every archetype
// shows up. 8m shops; the plaza gap sits around the origin.
const BLOCKS = [
  { key: 'NW2', side: 'N', xs: [-140, -132, -124, -116], types: ['record', 'opshop', 'book', 'milkbar'] },
  { key: 'NW1', side: 'N', xs: [-52, -44, -36, -28], types: ['video', 'toy', 'pawn', 'record'] },
  { key: 'NE1', side: 'N', xs: [28, 36, 44, 52], types: ['opshop', 'book', 'milkbar', 'video'] },
  { key: 'NE2', side: 'N', xs: [116, 124, 132, 140], types: ['dept', 'toy', 'pawn', 'opshop'] },
  { key: 'SW', side: 'S', xs: [-52, -44, -36, -28], types: ['milkbar', 'record', 'opshop', 'book'] },
  { key: 'SE', side: 'S', xs: [28, 36, 44, 52], types: ['toy', 'video', 'pawn', 'record'] },
];

let _uid = 0;
const uid = (p) => `${p}${_uid++}`;

function buildShopLots(citySeed, lots, shops, blocks) {
  _uid = 0;
  for (const bd of BLOCKS) {
    const north = bd.side === 'N';
    const z = north ? N_FRONT + D / 2 : S_FRONT - D / 2;
    const ry = north ? Math.PI : 0;
    const frontEdge = north ? 'S' : 'N';
    const xs = bd.xs, types = bd.types;
    const minX = Math.min(...xs) - W / 2, maxX = Math.max(...xs) + W / 2;
    const zNear = north ? N_FRONT : S_FRONT;
    const zFar = north ? N_FRONT + D : S_FRONT - D;
    const blockId = `block-${bd.key}`;
    blocks.push({
      id: blockId, district: 'main',
      poly: [[minX, Math.min(zNear, zFar)], [maxX, Math.min(zNear, zFar)],
             [maxX, Math.max(zNear, zFar)], [minX, Math.max(zNear, zFar)]],
    });
    xs.forEach((x, i) => {
      const type = types[i % types.length];
      const lotId = uid('lot-');
      const isAnchor = type === 'dept';
      const storeys = isAnchor ? 3 : (i % 3 === 0 ? 2 : 1);
      lots.push({
        id: lotId, block: blockId, x, z, w: W, d: D, ry,
        frontEdge, use: isAnchor ? 'anchor' : 'shop',
      });
      const seed = citySeed + _uid * 2654435761 % 0xffffffff;
      const s = (seed >>> 0);
      shops.push({
        id: uid('shop-'), lot: lotId, type,
        name: makeName(s, type), sign: makeName(s, type),
        seed: s, facadeSkin: pickFacade(s, type), storeys, hours: makeHours(s),
      });
    });
  }
}

function buildHouses(citySeed, lots) {
  // Backstreets: houses lining the cross street north of the square.
  const specs = [
    { x: CROSS_W - 5, z: 36, ry: Math.PI / 2, frontEdge: 'E' },
    { x: CROSS_W - 5, z: 60, ry: Math.PI / 2, frontEdge: 'E' },
    { x: CROSS_E + 5, z: 48, ry: -Math.PI / 2, frontEdge: 'W' },
    { x: CROSS_E + 5, z: 72, ry: -Math.PI / 2, frontEdge: 'W' },
  ];
  specs.forEach((sp, i) => {
    lots.push({
      id: `lot-house-${i}`, block: 'block-back', x: sp.x, z: sp.z,
      w: 9, d: 10, ry: sp.ry, frontEdge: sp.frontEdge, use: 'house',
    });
  });
}

function buildStalls(citySeed, lots, shops) {
  // Two market stalls in the square (brickpave plaza around the origin).
  const specs = [{ x: -9, z: 6, ry: 0 }, { x: 9, z: -6, ry: Math.PI }];
  specs.forEach((sp, i) => {
    const lotId = `lot-stall-${i}`;
    lots.push({ id: lotId, block: 'block-square', x: sp.x, z: sp.z, w: 4, d: 3, ry: sp.ry, use: 'stall', frontEdge: 'S' });
    const s = (citySeed + 7777 + i * 131) >>> 0;
    shops.push({
      id: `shop-stall-${i}`, lot: lotId, type: 'stall',
      name: makeName(s, 'stall'), sign: makeName(s, 'stall'),
      seed: s, facadeSkin: 'market', storeys: 1, hours: [8, 14],
    });
  });
}

/**
 * fixturePlan(citySeed) → CityPlan (schema v1). Deterministic in citySeed.
 */
export function fixturePlan(citySeed = 20261990) {
  citySeed = citySeed >>> 0;
  const lots = [], shops = [], blocks = [];
  buildShopLots(citySeed, lots, shops, blocks);
  buildHouses(citySeed, lots);
  buildStalls(citySeed, lots, shops);

  const r = rng(citySeed, 'city', 0);

  const plan = {
    version: 1,
    citySeed,
    name: pick(r, ['Wollamby', 'Dunroamin', 'Barretta', 'Coolabah', 'Mungindi', 'Yarraville Junction']),
    size: { w: 1024, d: 1024 },
    districts: [
      { id: 'main', kind: 'mainstreet', cx: 0, cz: 0 },
      { id: 'square', kind: 'market', cx: 0, cz: 0 },
      { id: 'back', kind: 'backstreets', cx: 0, cz: 55 },
    ],
    streets: {
      nodes: [
        { id: 'n0', x: -155, z: 0 },  // west end, main
        { id: 'n1', x: 0, z: 0 },     // central intersection / square
        { id: 'n2', x: 155, z: 0 },   // east end, main
        { id: 'n3', x: 0, z: 95 },    // north end, cross street
      ],
      edges: [
        { id: 'e0', a: 'n0', b: 'n1', width: 14, kind: 'main' },
        { id: 'e1', a: 'n1', b: 'n2', width: 14, kind: 'main' },
        { id: 'e2', a: 'n1', b: 'n3', width: 8, kind: 'side' },
      ],
    },
    blocks,
    lots,
    shops,
    // Which sky this town gets (Lane B lighting reads this; seeded so a town's weather is stable).
    sky: pick(r, ['golden-arvo', 'spring-puffy', 'endless-blue', 'high-cirrus', 'summer-storm', 'outback-dusk']),
  };
  return plan;
}

// Default fixture used by index.html when citygen is absent.
export default fixturePlan;