// Generates the placeholder PNGs of the reference map "gateau-etages".
// Usage: npm run gen:test-map
import { mkdirSync, writeFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { PNG } from 'pngjs';

const W = 2048;
const H = 1024;
const outDir = resolve(import.meta.dirname, '../assets/maps/gateau-etages');

const VOID = 0x000000;
const SPONGE = 0xf2c46d;
const CHOCOLATE = 0x5a3a22;
const CREAM = 0xffffff;
const JELLY = 0xd93a5b;
const BISCUIT = 0xc8964b;
const PLATE = 0x8899aa;

const terrain = new Uint32Array(W * H).fill(VOID);
const put = (x: number, y: number, c: number): void => {
  if (x >= 0 && y >= 0 && x < W && y < H) terrain[y * W + x] = c;
};
const rect = (x0: number, y0: number, x1: number, y1: number, c: number): void => {
  for (let y = y0; y < y1; y++) for (let x = x0; x < x1; x++) put(x, y, c);
};

// Plate: a wide dish with a raised rim.
rect(180, 960, 1868, 990, PLATE);
rect(150, 940, 200, 975, PLATE);
rect(1848, 940, 1898, 975, PLATE);

interface Tier {
  x0: number;
  x1: number;
  top: number;
  bottom: number;
}
const tiers: Tier[] = [
  { x0: 280, x1: 1768, top: 700, bottom: 960 },
  { x0: 520, x1: 1528, top: 470, bottom: 700 },
  { x0: 780, x1: 1268, top: 270, bottom: 470 },
];

for (const t of tiers) {
  const h = t.bottom - t.top;
  rect(t.x0, t.top, t.x1, t.bottom, SPONGE);
  // Biscuit base, jelly layer and chocolate layer.
  rect(t.x0, t.bottom - Math.round(h * 0.12), t.x1, t.bottom, BISCUIT);
  rect(t.x0, t.top + Math.round(h * 0.55), t.x1, t.top + Math.round(h * 0.62), JELLY);
  rect(t.x0, t.top + Math.round(h * 0.3), t.x1, t.top + Math.round(h * 0.36), CHOCOLATE);
  // Chocolate pillar in the middle, a hard core to dig around.
  const mid = Math.round((t.x0 + t.x1) / 2);
  rect(mid - 20, t.top + 20, mid + 20, t.bottom - Math.round(h * 0.12), CHOCOLATE);
  // Whipped cream frosting with drips.
  for (let x = t.x0 - 6; x < t.x1 + 6; x++) {
    const wave = Math.round(6 + 4 * Math.sin(x / 23));
    for (let y = t.top - wave; y < t.top + 12; y++) put(x, y, CREAM);
    const drip = (x * 7919) % 97 < 6 ? 18 + ((x * 31) % 22) : 0;
    if (x >= t.x0 && x < t.x1) for (let y = t.top + 12; y < t.top + 12 + drip; y++) put(x, y, CREAM);
  }
  for (let y = t.top; y < t.top + 60; y++) {
    const len = Math.max(0, 6 - Math.floor((y - t.top) / 10));
    for (let i = 0; i < len; i++) {
      put(t.x0 - 6 + i, y, CREAM);
      put(t.x1 + 5 - i, y, CREAM);
    }
  }
}

function writePng(name: string, w: number, h: number, pixel: (x: number, y: number) => number): void {
  const png = new PNG({ width: w, height: h });
  for (let y = 0; y < h; y++) {
    for (let x = 0; x < w; x++) {
      const c = pixel(x, y);
      const i = (y * w + x) * 4;
      png.data[i] = (c >> 16) & 0xff;
      png.data[i + 1] = (c >> 8) & 0xff;
      png.data[i + 2] = c & 0xff;
      png.data[i + 3] = 0xff;
    }
  }
  writeFileSync(resolve(outDir, name), PNG.sync.write(png));
}

const lerp = (a: number, b: number, t: number): number => Math.round(a + (b - a) * t);
const mix = (c1: number, c2: number, t: number): number =>
  (lerp(c1 >> 16, c2 >> 16, t) << 16) | (lerp((c1 >> 8) & 0xff, (c2 >> 8) & 0xff, t) << 8) | lerp(c1 & 0xff, c2 & 0xff, t);

// ---------- Background: a cartoon kitchen, drawn with felt-pen outlines ----------

const INK = 0x3b2414;
const TABLE_Y = 900;

function hash(x: number, y: number): number {
  let h = Math.imul(x, 374761393) ^ Math.imul(y, 668265263);
  h = Math.imul(h ^ (h >>> 13), 1274126177);
  return ((h ^ (h >>> 16)) >>> 0) / 4294967296;
}

function paintBackground(): Uint32Array {
  const img = new Uint32Array(W * H);
  type Inside = (x: number, y: number) => boolean;
  /** Fills a shape (inside test over a bounding box) with a color function and a felt outline. */
  const shape = (x0: number, y0: number, x1: number, y1: number, inside: Inside, fill: (x: number, y: number) => number, outline = 4): void => {
    for (let y = Math.max(0, Math.floor(y0) - 1); y < Math.min(H, Math.ceil(y1) + 1); y++) {
      for (let x = Math.max(0, Math.floor(x0) - 1); x < Math.min(W, Math.ceil(x1) + 1); x++) {
        if (!inside(x, y)) continue;
        const t = outline - (hash(x >> 2, y >> 2) < 0.3 ? 1 : 0);
        const edge = outline > 0 && (!inside(x - t, y) || !inside(x + t, y) || !inside(x, y - t) || !inside(x, y + t));
        img[y * W + x] = edge ? INK : fill(x, y);
      }
    }
  };
  const rect = (x0: number, y0: number, x1: number, y1: number): Inside => (x, y) => x >= x0 && x < x1 && y >= y0 && y < y1;
  const ellipse = (cx: number, cy: number, rx: number, ry: number): Inside => (x, y) => ((x - cx) / rx) ** 2 + ((y - cy) / ry) ** 2 <= 1;
  const solid = (c: number) => (): number => c;

  // Wallpaper: cream with pink stripes and tiny dots, warmer toward the table.
  shape(0, 0, W, TABLE_Y, () => true, (x, y) => {
    const stripe = x % 96 < 30;
    const dot = !stripe && ((x + (Math.floor(y / 40) % 2) * 24) % 48) ** 2 / 9 + ((y % 40) - 20) ** 2 / 9 < 4;
    const base = stripe ? 0xffdbe3 : dot ? 0xf7c9a8 : 0xfff3dc;
    return mix(base, 0xf6d7b0, Math.max(0, (y - 300) / 900));
  }, 0);
  // Skirting board.
  shape(0, TABLE_Y - 40, W, TABLE_Y, rect(-10, TABLE_Y - 40, W + 10, TABLE_Y + 10), (x, y) => (y < TABLE_Y - 34 ? 0xffffff : 0xe8c9a0));

  // Window with sky, clouds and a sun.
  const wx0 = 1480, wy0 = 90, wx1 = 1900, wy1 = 470;
  shape(wx0 - 24, wy0 - 24, wx1 + 24, wy1 + 34, rect(wx0 - 24, wy0 - 24, wx1 + 24, wy1 + 34), solid(0xffffff));
  shape(wx0, wy0, wx1, wy1, rect(wx0, wy0, wx1, wy1), (x, y) => {
    const t = (y - wy0) / (wy1 - wy0);
    if ((x - 1820) ** 2 + (y - 160) ** 2 < 42 ** 2) return 0xffe14d;
    const cloud = [[1560, 200, 50], [1610, 185, 60], [1665, 205, 45], [1700, 330, 40], [1745, 318, 52], [1790, 335, 38]];
    for (const [cx, cy, r] of cloud) if ((x - cx) ** 2 + ((y - cy) * 1.5) ** 2 < r * r) return 0xffffff;
    return mix(0x8fd3ff, 0xd9f1ff, t);
  }, 4);
  shape(wx0, (wy0 + wy1) / 2 - 7, wx1, (wy0 + wy1) / 2 + 7, rect(wx0 - 5, (wy0 + wy1) / 2 - 7, wx1 + 5, (wy0 + wy1) / 2 + 7), solid(0xffffff), 3);
  shape((wx0 + wx1) / 2 - 7, wy0, (wx0 + wx1) / 2 + 7, wy1, rect((wx0 + wx1) / 2 - 7, wy0 - 5, (wx0 + wx1) / 2 + 7, wy1 + 5), solid(0xffffff), 3);
  // Curtains (pink gingham), gently waved.
  for (const side of [-1, 1]) {
    const cx = side < 0 ? wx0 - 30 : wx1 + 30;
    const inside: Inside = (x, y) => {
      if (y < wy0 - 50 || y > wy1 + 90) return false;
      const width = 70 + Math.sin(y / 30) * 8 + (y - wy0) * 0.06;
      return side < 0 ? x > cx - 40 && x < cx - 40 + width : x < cx + 40 && x > cx + 40 - width;
    };
    shape(cx - 120, wy0 - 60, cx + 120, wy1 + 100, inside, (x, y) => ((Math.floor(x / 14) + Math.floor(y / 14)) % 2 ? 0xff8fab : 0xffe3ea));
  }
  shape(wx0 - 90, wy0 - 66, wx1 + 90, wy0 - 46, rect(wx0 - 90, wy0 - 66, wx1 + 90, wy0 - 46), solid(0xc8964b), 3);

  // Shelf with jars and cups.
  const sy = 330;
  shape(70, sy, 600, sy + 22, rect(70, sy, 600, sy + 22), (x) => (x % 60 < 3 ? 0x9c6b3a : 0xc8964b));
  for (const [x, y] of [[110, sy + 22], [560, sy + 22]]) shape(x - 12, y, x + 12, y + 40, (px, py) => px >= x - 12 && px < x + 12 && py >= y && py < y + 40 - (px - x + 12), solid(0x9c6b3a), 3);
  const jar = (cx: number, w: number, h: number, color: number, lid: number): void => {
    shape(cx - w / 2, sy - h, cx + w / 2, sy, rect(cx - w / 2, sy - h, cx + w / 2, sy + 2), (x, y) => (x - cx + w / 2 < 8 ? mix(color, 0xffffff, 0.4) : y > sy - h * 0.6 ? color : mix(color, 0xffffff, 0.6)));
    shape(cx - w / 2 - 4, sy - h - 16, cx + w / 2 + 4, sy - h + 2, rect(cx - w / 2 - 4, sy - h - 16, cx + w / 2 + 4, sy - h + 2), solid(lid), 3);
  };
  jar(160, 70, 110, 0xd93a5b, 0xff6f91);
  jar(250, 60, 80, 0xf2c46d, 0x4dc4ff);
  jar(335, 80, 130, 0x5a3a22, 0x9be15d);
  // Teacup.
  shape(420, sy - 60, 520, sy, ellipse(470, sy - 60, 50, 60), (x, y) => (y < sy - 60 ? 0xfff6e4 : (x + y) % 40 < 6 ? 0xff8fab : 0xffffff));
  shape(505, sy - 55, 545, sy - 15, (x, y) => { const d = Math.hypot(x - 515, y - 35 - sy + 70); return d < 22 && d > 12 && x > 515; }, solid(0xffffff), 3);
  shape(400, sy - 10, 540, sy, ellipse(470, sy - 4, 70, 9), solid(0xffffff), 3);

  // Wall clock.
  shape(250, 470, 410, 630, ellipse(330, 550, 78, 78), (x, y) => {
    const d = Math.hypot(x - 330, y - 550);
    return d > 62 ? 0xff6f91 : 0xfff6e4;
  });
  shape(326, 495, 334, 552, rect(326, 495, 334, 552), solid(INK), 0);
  shape(330, 546, 375, 554, rect(330, 546, 375, 554), solid(INK), 0);
  for (let i = 0; i < 12; i++) {
    const a = (i / 12) * Math.PI * 2;
    const tx = 330 + Math.cos(a) * 52;
    const ty = 550 + Math.sin(a) * 52;
    shape(tx - 4, ty - 4, tx + 4, ty + 4, ellipse(tx, ty, 4, 4), solid(INK), 0);
  }

  // Bunting garland across the top.
  const sag = (x: number): number => 30 + 70 * Math.sin((x / W) * Math.PI);
  shape(0, 0, W, 130, (x, y) => Math.abs(y - sag(x)) < 3, solid(INK), 0);
  const flagColors = [0xff6f91, 0xffe14d, 0x4dc4ff, 0x9be15d, 0xb18cff];
  for (let i = 0, fx = 20; fx < W; i++, fx += 110) {
    const top = sag(fx + 35);
    const inside: Inside = (x, y) => {
      const t = (y - top) / 70;
      return t >= 0 && t <= 1 && Math.abs(x - (fx + 35)) <= 35 * (1 - t);
    };
    shape(fx - 2, top - 2, fx + 72, top + 74, inside, (x, y) => (hash(x >> 3, y >> 3) < 0.15 ? 0xffffff : flagColors[i % flagColors.length]));
  }

  // Table: lace edge then a gingham tablecloth with a hint of perspective.
  shape(0, TABLE_Y, W, H, rect(-10, TABLE_Y, W + 10, H + 10), (x, y) => {
    const depth = (y - TABLE_Y) / (H - TABLE_Y);
    const cell = 40 + depth * 30;
    const cx = Math.floor((x - W / 2) / cell);
    const cy = Math.floor((y - TABLE_Y) / (cell * 0.6));
    const a = (cx & 1) === 0;
    const b = (cy & 1) === 0;
    const base = a && b ? 0xe85d75 : a || b ? 0xf7a8b8 : 0xfff3f5;
    return mix(base, 0x7a3a2a, depth * 0.25);
  });
  shape(0, TABLE_Y - 6, W, TABLE_Y + 30, (x, y) => y >= TABLE_Y - 6 && y < TABLE_Y + 14 + 12 * Math.abs(Math.sin((x / 40) * Math.PI)), (x, y) => (((x % 40) - 20) ** 2 + (y - TABLE_Y - 8) ** 2 < 25 ? 0xf3dfe3 : 0xffffff), 3);
  return img;
}

mkdirSync(outDir, { recursive: true });
writePng('terrain.png', W, H, (x, y) => terrain[y * W + x]);
const background = paintBackground();
writePng('background.png', W, H, (x, y) => background[y * W + x]);
const TW = 256;
const TH = 128;
writePng('thumb.png', TW, TH, (x, y) => {
  const c = terrain[Math.floor((y * H) / TH) * W + Math.floor((x * W) / TW)];
  return c === VOID ? 0xbfe6ff : c;
});
console.log(`Wrote terrain.png, background.png and thumb.png to ${outDir}`);