// tests/fixtures/_setup.js
// Run once to create test fixtures. Not part of regular tests.
const fs = require('node:fs');
const path = require('node:path');
const { PNG } = require('pngjs');

function writeSolidPng(filePath, w, h, rgba) {
    const png = new PNG({ width: w, height: h });
    for (let y = 0; y < h; y++) {
        for (let x = 0; x < w; x++) {
            const i = (y * w + x) * 4;
            png.data[i + 0] = rgba[0];
            png.data[i + 1] = rgba[1];
            png.data[i + 2] = rgba[2];
            png.data[i + 3] = rgba[3];
        }
    }
    fs.writeFileSync(filePath, PNG.sync.write(png));
}

function writeSolidL8Png(filePath, w, h, v) {
    const png = new PNG({ width: w, height: h, colorType: 0 });  // grayscale
    for (let y = 0; y < h; y++) {
        for (let x = 0; x < w; x++) {
            png.data[(y * w + x) * 4 + 0] = v;
            png.data[(y * w + x) * 4 + 1] = v;
            png.data[(y * w + x) * 4 + 2] = v;
            png.data[(y * w + x) * 4 + 3] = 255;
        }
    }
    fs.writeFileSync(filePath, PNG.sync.write(png));
}

const dir = path.resolve(__dirname, 'small-fresh');
fs.mkdirSync(dir, { recursive: true });
writeSolidPng(path.join(dir, 'grass_diffuse.png'),  32, 32, [110, 170,  80, 255]);
writeSolidPng(path.join(dir, 'stone_diffuse.png'),  32, 32, [120, 120, 120, 255]);
writeSolidPng(path.join(dir, 'water_diffuse.png'),  32, 32, [ 60, 110, 180, 255]);
writeSolidL8Png(path.join(dir, 'water_height.png'), 32, 32, 0);   // L8=0 plane
console.log('fixtures written: small-fresh/');