import * as fs from 'fs';
const text = fs.readFileSync('C:/ScriptoriumAI/scriptoriumai-ui/src/__tests__/Runboard.telemetry-lockstep-parity.test.tsx', 'utf8');

const testMatches = [];
const regex = /^\s*it\(['"]([^'"]+)['"],\s*(?:async\s)?\(\)\s*=>\s*\{/gm;
let match;
while ((match = regex.exec(text)) !== null) {
   testMatches.push({ index: match.index, length: match[0].length, name: match[1] });
}

console.log('Found', testMatches.length, 'it blocks.');
const tailIdx = text.lastIndexOf('})'); // closes the describe
console.log('Tail starts at:', tailIdx);

const prefix = text.substring(0, testMatches[0].index);
const suffix = text.substring(tailIdx);

const batchSize = Math.ceil(testMatches.length / 4);

for (let i = 0; i < 4; i++) {
    const chunkMatches = testMatches.slice(i * batchSize, (i + 1) * batchSize);
    if (!chunkMatches.length) continue;

    const start = chunkMatches[0].index;
    const end = i === 3 ? tailIdx : chunkMatches[chunkMatches.length - 1].index + (testMatches[(i+1)*batchSize] ? (testMatches[(i+1)*batchSize].index - chunkMatches[chunkMatches.length-1].index) : tailIdx - chunkMatches[chunkMatches.length-1].index);
    const sliceEnd = i === 3 || !testMatches[(i+1)*batchSize] ? tailIdx : testMatches[(i+1)*batchSize].index;

    const body = text.substring(start, sliceEnd);
    fs.writeFileSync(C:/ScriptoriumAI/scriptoriumai-ui/src/__tests__/Runboard.telemetry-lockstep-parity.part + (i+1) + .test.tsx, prefix + body + suffix);
    console.log(Wrote part  + (i+1) +  with  + chunkMatches.length +  tests.);
}

// Remove original if successful
fs.unlinkSync('C:/ScriptoriumAI/scriptoriumai-ui/src/__tests__/Runboard.telemetry-lockstep-parity.test.tsx');
console.log('Original massive file removed.');