// repeated document changes must not accumulate unbounded live analysis storage.
const assert = require('assert');
const cp = require('child_process');
const host = cp.spawn(process.argv[2], process.argv.slice(3), { stdio: ['pipe', 'pipe', 'pipe'] });
const cycles = Number(process.env.LSP_CYCLES || 256), uri = 'file:///longevity.zc';
let buffer = Buffer.alloc(0), errors = '', next = 1;
const pending = new Map();
const timeout = setTimeout(() => { host.kill(); console.error('FAIL lsp longevity timed out'); process.exitCode = 1; }, 60000);
function send(m) { const b = Buffer.from(JSON.stringify({ jsonrpc: '2.0', ...m })); host.stdin.write(Buffer.concat([Buffer.from(`Content-Length: ${b.length}\r\n\r\n`), b])); }
function request(method, params) { const id = next++; return new Promise((resolve, reject) => { pending.set(id, { resolve, reject }); send({ id, method, params }); }); }
host.stderr.on('data', b => { errors += b; });
host.stdout.on('data', b => {
    buffer = Buffer.concat([buffer, b]);
    while (true) {
        const e = buffer.indexOf('\r\n\r\n'); if (e < 0) break;
        const n = Number(/Content-Length:\s*(\d+)/i.exec(buffer.subarray(0, e).toString())[1]); if (buffer.length < e + 4 + n) break;
        const m = JSON.parse(buffer.subarray(e + 4, e + 4 + n)); buffer = buffer.subarray(e + 4 + n);
        if (pending.has(m.id)) { const p = pending.get(m.id); pending.delete(m.id); m.error ? p.reject(new Error(JSON.stringify(m.error))) : p.resolve(m.result); }
        if (m.method === 'textDocument/publishDiagnostics') assert.ok(!m.params.diagnostics.some(d => d.severity === 1), JSON.stringify(m.params));
    }
});
host.on('error', e => { for (const p of pending.values()) p.reject(e); });
function rss() { const r = cp.spawnSync('ps', ['-o', 'rss=', '-p', String(host.pid)], { encoding: 'utf8' }); assert.strictEqual(r.status, 0); return Number(r.stdout.trim()); }
(async () => {
    try {
        await request('initialize', {});
        const text = i => `fn square(int n) { return n * n; } fn main() { let answer = square(${i % 16}); return answer; }`;
        send({ method: 'textDocument/didOpen', params: { textDocument: { uri, version: 1, text: text(0) } } });
        let baseline;
        for (let i = 0; i < cycles; i++) {
            if (i) send({ method: 'textDocument/didChange', params: { textDocument: { uri, version: i + 1 }, contentChanges: [{ text: text(i) }] } });
            const tokens = await request('textDocument/semanticTokens/full', { textDocument: { uri } });
            assert.ok(tokens.data.length);
            if (i === 31 || (cycles <= 32 && i === 0)) baseline = rss();
            if (i % 32 === 0) {
                const r = await request('textDocument/definition', { textDocument: { uri }, position: { line: 0, character: text(i).lastIndexOf('answer') } }); assert.ok(r?.length);
            }
        }
        const end = rss(); assert.ok(end - baseline < 96 * 1024, `rss grew by ${end - baseline} KiB`);
        send({ method: 'textDocument/didClose', params: { textDocument: { uri } } });
        await request('shutdown', null); send({ method: 'exit' }); host.stdin.end();
        console.log(`ok   ${cycles} editor changes with tokens/navigation; post-warmup rss delta ${end - baseline} KiB`);
    } finally { clearTimeout(timeout); host.kill(); }
})().catch(e => { console.error(e); console.error(errors); process.exitCode = 1; });