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'use strict';
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const { PNG } = require('pngjs');
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// Minecraft map color palette (base colors × 4 shades each)
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// Source: https://minecraft.wiki/w/Map_item_format#Color_table
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// Index 0-3 = NONE (transparent), 4-7 = GRASS, 8-11 = SAND, etc.
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// Each base color has 4 multipliers: 0.71, 0.86, 1.0, 0.53
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const BASE_COLORS = [
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null, // 0: NONE
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[127, 178, 56], // 1: GRASS
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[247, 233, 163], // 2: SAND
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[199, 199, 199], // 3: WOOL
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[255, 0, 0], // 4: FIRE
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[160, 160, 255], // 5: ICE
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[167, 167, 167], // 6: METAL
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[0, 124, 0], // 7: PLANT
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[255, 255, 255], // 8: SNOW
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[164, 168, 184], // 9: CLAY
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[151, 109, 77], // 10: DIRT
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[112, 112, 112], // 11: STONE
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[64, 64, 255], // 12: WATER
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[143, 119, 72], // 13: WOOD
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[255, 252, 245], // 14: QUARTZ
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[216, 127, 51], // 15: COLOR_ORANGE
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[178, 76, 216], // 16: COLOR_MAGENTA
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[102, 153, 216], // 17: COLOR_LIGHT_BLUE
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[229, 229, 51], // 18: COLOR_YELLOW
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[127, 204, 25], // 19: COLOR_LIGHT_GREEN
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[242, 127, 165], // 20: COLOR_PINK
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[76, 76, 76], // 21: COLOR_GRAY
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[153, 153, 153], // 22: COLOR_LIGHT_GRAY
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[76, 127, 153], // 23: COLOR_CYAN
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[127, 63, 178], // 24: COLOR_PURPLE
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[51, 76, 178], // 25: COLOR_BLUE
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[102, 76, 51], // 26: COLOR_BROWN
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[102, 127, 51], // 27: COLOR_GREEN
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[153, 51, 51], // 28: COLOR_RED
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[25, 25, 25], // 29: COLOR_BLACK
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[250, 238, 77], // 30: GOLD
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[92, 219, 213], // 31: DIAMOND
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[74, 128, 255], // 32: LAPIS
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[0, 217, 58], // 33: EMERALD
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[129, 86, 49], // 34: PODZOL
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[112, 2, 0], // 35: NETHER
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[209, 177, 161], // 36: TERRACOTTA_WHITE
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[159, 82, 36], // 37: TERRACOTTA_ORANGE
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[149, 87, 108], // 38: TERRACOTTA_MAGENTA
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[112, 108, 138], // 39: TERRACOTTA_LIGHT_BLUE
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[186, 133, 36], // 40: TERRACOTTA_YELLOW
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[103, 117, 53], // 41: TERRACOTTA_LIGHT_GREEN
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[160, 77, 78], // 42: TERRACOTTA_PINK
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[57, 41, 35], // 43: TERRACOTTA_GRAY
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[135, 107, 98], // 44: TERRACOTTA_LIGHT_GRAY
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[87, 92, 92], // 45: TERRACOTTA_CYAN
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[122, 73, 88], // 46: TERRACOTTA_PURPLE
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[76, 62, 92], // 47: TERRACOTTA_BLUE
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[76, 50, 35], // 48: TERRACOTTA_BROWN
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[76, 82, 42], // 49: TERRACOTTA_GREEN
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[142, 60, 46], // 50: TERRACOTTA_RED
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[37, 22, 16], // 51: TERRACOTTA_BLACK
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[189, 48, 49], // 52: CRIMSON_NYLIUM
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[148, 63, 97], // 53: CRIMSON_STEM
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[92, 25, 29], // 54: CRIMSON_HYPHAE
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[22, 126, 134], // 55: WARPED_NYLIUM
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[58, 142, 140], // 56: WARPED_STEM
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[86, 44, 62], // 57: WARPED_HYPHAE
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[20, 180, 133], // 58: WARPED_WART_BLOCK
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[100, 100, 100], // 59: DEEPSLATE
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[216, 175, 147], // 60: RAW_IRON
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[127, 167, 150], // 61: GLOW_LICHEN
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];
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const SHADE_MULTIPLIERS = [180, 220, 255, 135]; // out of 255
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// Build the full 256-entry lookup: MAP_COLORS[colorIndex] → [r, g, b]
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const MAP_COLORS = new Array(256).fill(null);
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for (let base = 0; base < BASE_COLORS.length; base++) {
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for (let shade = 0; shade < 4; shade++) {
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const idx = base * 4 + shade;
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if (!BASE_COLORS[base]) {
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MAP_COLORS[idx] = [0, 0, 0, 0]; // transparent
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} else {
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const [r, g, b] = BASE_COLORS[base];
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const m = SHADE_MULTIPLIERS[shade];
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MAP_COLORS[idx] = [
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Math.floor(r * m / 255),
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Math.floor(g * m / 255),
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Math.floor(b * m / 255),
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255
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];
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}
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}
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}
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/**
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* Apply a partial map update from a protocol packet to a pixel buffer.
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* @param {Uint8Array} pixels - 128×128 color index buffer (mutated in place)
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* @param {Object} packet - Map protocol packet with columns, rows, x, y, data
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*/
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function applyMapUpdate(pixels, packet) {
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const { columns, rows, x, y, data } = packet;
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if (!columns || columns === 0 || !data) return;
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for (let col = 0; col < columns; col++) {
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for (let row = 0; row < rows; row++) {
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const srcIdx = col * rows + row;
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const dstX = x + col;
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const dstY = y + row;
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if (dstX < 128 && dstY < 128) {
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pixels[dstY * 128 + dstX] = data[srcIdx];
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}
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}
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}
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}
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/**
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* Render a 128×128 color-index buffer to a base64 PNG string.
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* @param {Uint8Array} pixels - 128×128 array of Minecraft color indices
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* @returns {string} base64-encoded PNG
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*/
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function renderMapToPNG(pixels) {
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const png = new PNG({ width: 128, height: 128 });
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for (let i = 0; i < 128 * 128; i++) {
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const colorIdx = pixels[i];
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const color = MAP_COLORS[colorIdx] || [0, 0, 0, 0];
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const offset = i * 4;
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png.data[offset] = color[0]; // R
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png.data[offset + 1] = color[1]; // G
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png.data[offset + 2] = color[2]; // B
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png.data[offset + 3] = color[3]; // A
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}
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const buffer = PNG.sync.write(png);
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return buffer.toString('base64');
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}
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module.exports = { MAP_COLORS, applyMapUpdate, renderMapToPNG };
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