// modules/test/test-ai-fs-tools.js — run: node
// Proves MAINT-011 (list_files must see the virtual /sys mount) and MAINT-012
// (write_file must not report success when the write was refused).
const fsMod = require('fs'), path = require('path');
const ROOT = path.join(__dirname, '..', 'core');
const ls = {};
global.localStorage = { getItem: k => (k in ls ? ls[k] : null), setItem: (k, v) => { ls[k] = String(v); }, removeItem: k => { delete ls[k]; } };
global.indexedDB = { open() { throw new Error('no idb'); }, deleteDatabase() { throw new Error('no idb'); } };
global.window = global;

const load = (file, cls) => new Function(fsMod.readFileSync(path.join(ROOT, file), 'utf8') + '\nreturn ' + cls + ';')();
const VFS = load('virtual-fs.js', 'VirtualFileSystem');
const AI = load('module-aiassist.js', 'WebX11AIAssistantModule');

function mk() {
    const out = [];
    const vfs = new VFS();
    vfs.saveToStorage = () => true;
    // Bypass the constructor (it touches the DOM) but keep the real prototype methods.
    const ai = Object.create(AI.prototype);
    ai.terminal = { print: (m, t) => out.push({ text: String(m), type: t || '' }), log: () => {}, fs: vfs };
    ai.checkGuardrail = () => null;
    return { ai, vfs, out };
}

let fails = 0, passes = 0;
function ok(name, cond, detail) {
    if (cond) { passes++; return; }
    fails++;
    console.log('FAIL ' + name + (detail ? ' — ' + detail : ''));
}
const run = async (ai, name, args) => JSON.parse(await ai.runTool(name, args));

(async () => {
    // A. list_files on the virtual /sys mount
    {
        const { ai } = mk();
        const res = await run(ai, 'list_files', { path: '/sys' });
        ok('A1 /sys lists entries instead of an error', Array.isArray(res), JSON.stringify(res).slice(0, 120));
        ok('A2 /sys contains the modules mount', Array.isArray(res) && res.some(e => e.name === 'modules'),
            JSON.stringify(res).slice(0, 160));
    }

    // B. a genuinely missing directory still reports the error
    {
        const { ai } = mk();
        const res = await run(ai, 'list_files', { path: '/no-such-dir' });
        ok('B1 missing path reports Directory not found', !!res.error && /Directory not found/.test(res.error), JSON.stringify(res));
    }

    // C. write_file into a missing parent must not claim success
    {
        const { ai, vfs } = mk();
        const res = await ai.runTool('write_file', { path: '/missing/dir/f.txt', content: 'x' });
        ok('C1 refused write reports failure', typeof res === 'string' && /Write FAILED/.test(res), String(res));
        ok('C2 nothing was created', vfs.readFile('/missing/dir/f.txt') === null);
    }

    // D. the same write succeeds once the parent exists
    {
        const { ai, vfs } = mk();
        vfs.mkdirRecursive('/missing/dir');
        const res = await ai.runTool('write_file', { path: '/missing/dir/f.txt', content: 'x' });
        ok('D1 successful write still reports success', /File written/.test(String(res)), String(res));
        ok('D2 content landed', vfs.readFile('/missing/dir/f.txt') === 'x');
    }

    if (fails === 0) {
        console.log('test-ai-fs-tools: ' + passes + ' passed, 0 failed');
    } else {
        console.log('test-ai-fs-tools: ' + passes + ' passed, ' + fails + ' FAILED');
        process.exit(1);
    }
})();