/**
 * AWB Runner - Static WASM version
 *
 * Usage: node run_awb_static.cjs <input_base64>
 *
 * Writes input PNG to MEMFS (preRun), runs main(), reads output from MEMFS,
 * outputs base64 of result PNG to stdout. Metadata to stderr.
 */
const path = require('path');
const fs = require('fs');

const inputBase64 = process.argv[2];
if (!inputBase64) {
    console.error('Usage: node run_awb_static.cjs <input_base64>');
    process.exit(1);
}

const mod = require('./awb_static.js');

// Prevent auto-running of main()
mod.noInitialRun = true;

// Write input to MEMFS before main()
mod.preRun = function() {
    const buf = Buffer.from(inputBase64, 'base64');
    mod.FS.mkdirTree('/data');
    mod.FS.writeFile('/data/input.png', new Uint8Array(buf));
};

// Wait for runtime init, then call callMain manually
mod.onRuntimeInitialized = function() {
    try {
        mod.callMain([]);
        // After main completes, read output
        const outputBytes = mod.FS.readFile('/data/output.png');
        process.stdout.write(Buffer.from(outputBytes).toString('base64'));
    } catch (e) {
        console.error('ERR:', e.message || e);
        process.exit(1);
    }
};