const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('fs/promises');
const os = require('os');
const path = require('path');
const {
    LayaRequestError,
    LayaService,
    clearDirectoryContents,
    validateBatchPayload
} = require('../server/services/layaService');

test('status reports an unavailable runtime without throwing', async () => {
    const modelDir = await fs.mkdtemp(path.join(os.tmpdir(), 'nodecast-laya-status-'));
    const service = new LayaService({
        modelDir,
        cache: null,
        fetch: async () => { throw new Error('connection refused'); }
    });
    const status = await service.status();
    assert.equal(status.runtimeAvailable, false);
    assert.equal(status.ready, false);
    assert.equal(status.modelPresent, false);
    assert.equal(status.phase, 'idle');
    assert.equal(status.downloading, false);
    assert.equal(status.progressPercent, null);
    assert.equal(status.bytesDownloaded, null);
    assert.equal(status.totalBytes, null);
    assert.equal(status.sizeBytes, 0);
    assert.equal(status.error, null);
    assert.match(status.runtimeError.detail, /Start the Laya sidecar/);
});

test('status does not report ready when a model exists but the runtime is unavailable', async () => {
    const modelDir = await fs.mkdtemp(path.join(os.tmpdir(), 'nodecast-laya-offline-model-'));
    await fs.writeFile(path.join(modelDir, 'model.bin'), 'model');
    const service = new LayaService({
        modelDir,
        cache: null,
        fetch: async () => { throw new Error('connection refused'); }
    });

    const status = await service.status();

    assert.equal(status.modelPresent, true);
    assert.equal(status.runtimeAvailable, false);
    assert.equal(status.ready, false);
    assert.equal(status.runtimeError.message, 'Laya runtime is unavailable');
});

test('model download exposes an indeterminate transition and finishes ready', async () => {
    const modelDir = await fs.mkdtemp(path.join(os.tmpdir(), 'nodecast-laya-download-'));
    let finishDownload;
    const downloadResponse = new Promise(resolve => { finishDownload = resolve; });
    const service = new LayaService({
        modelDir,
        cache: null,
        progressIntervalMs: 5,
        fetch: async url => {
            if (url.endsWith('/health')) return { ok: true, json: async () => ({ status: 'ok' }) };
            await downloadResponse;
            return { ok: true, json: async () => ({ answers: {} }) };
        }
    });

    const started = service.startModelDownload();
    assert.equal(started.phase, 'preparing');
    assert.equal(started.downloading, true);
    assert.equal(started.progressPercent, null);

    await fs.writeFile(path.join(modelDir, 'partial.bin'), 'partial model');
    await new Promise(resolve => setTimeout(resolve, 15));
    const downloading = await service.status();
    assert.equal(downloading.phase, 'downloading');
    assert.equal(downloading.downloading, true);
    assert.ok(downloading.bytesDownloaded > 0);

    finishDownload();
    await service.downloadPromise;
    const ready = await service.status();
    assert.equal(ready.phase, 'ready');
    assert.equal(ready.downloading, false);
    assert.equal(ready.modelPresent, true);
    assert.equal(ready.error, null);
});

test('download failures remain visible in status and retry resets the error', async () => {
    const modelDir = await fs.mkdtemp(path.join(os.tmpdir(), 'nodecast-laya-failure-'));
    let shouldFail = true;
    const service = new LayaService({
        modelDir,
        cache: null,
        fetch: async url => {
            if (url.endsWith('/health')) throw new Error('connection refused at https://secret.invalid/token');
            if (shouldFail) throw new Error('download failed at https://secret.invalid/token');
            return { ok: true, json: async () => ({ answers: {} }) };
        }
    });

    service.startModelDownload();
    await service.downloadPromise;
    const failed = await service.status();
    assert.equal(failed.phase, 'failed');
    assert.equal(failed.downloading, false);
    assert.equal(failed.error.message, 'Laya runtime is unavailable');
    assert.doesNotMatch(JSON.stringify(failed), /secret\.invalid|token/);

    shouldFail = false;
    const retry = service.startModelDownload();
    assert.equal(retry.error, null);
    assert.equal(retry.lastError, null);
    await service.downloadPromise;
});

test('model deletion remains limited to the configured model directory', async () => {
    const parent = await fs.mkdtemp(path.join(os.tmpdir(), 'nodecast-laya-delete-'));
    const modelDir = path.join(parent, 'models');
    const sentinel = path.join(parent, 'keep.txt');
    await fs.mkdir(path.join(modelDir, 'nested'), { recursive: true });
    await fs.writeFile(path.join(modelDir, 'nested', 'model.bin'), 'model');
    await fs.writeFile(sentinel, 'keep');

    const service = new LayaService({ modelDir, cache: null, fetch: async () => { throw new Error('offline'); } });
    service.downloadState.phase = 'failed';
    service.downloadState.error = { message: 'previous error', detail: 'safe' };
    const deleted = await service.deleteModel();

    assert.deepEqual(await fs.readdir(modelDir), []);
    assert.equal(await fs.readFile(sentinel, 'utf8'), 'keep');
    assert.equal(deleted.phase, 'idle');
    assert.equal(deleted.error, null);
    assert.equal(deleted.sizeBytes, 0);
});

test('batch validation rejects oversized item counts', () => {
    assert.throws(
        () => validateBatchPayload({ items: Array.from({ length: 65 }, (_, id) => ({ id, text: 'channel' })) }),
        error => error instanceof LayaRequestError && error.statusCode === 413
    );
});

test('language batch sends the Laya contract and parses language confidence without fallback', async () => {
    let requestedUrl;
    let requestBody;
    const service = new LayaService({
        cache: null,
        batchTimeoutMs: 120000,
        fetch: async (url, options) => {
            requestedUrl = url;
            requestBody = JSON.parse(options.body);
            return {
                ok: true,
                json: async () => ({
                    results: [
                        { answers: { language: { choice: 'fr', answer_confidence: 0.93 } } },
                        { answers: { language: { choice: 'en', confidence: 0.81 } } }
                    ]
                })
            };
        }
    });

    const response = await service.detectBatch({
        model: 'multilingual',
        items: [
            { id: 'fr-channel', text: 'France 2 FR' },
            { id: 'en-channel', text: 'BBC News UK' }
        ]
    });

    assert.equal(requestedUrl, 'http://laya:8000/v1/systemone/batch');
    assert.deepEqual(requestBody.states, ['France 2 FR', 'BBC News UK']);
    assert.equal(requestBody.model, 'multilingual');
    assert.deepEqual(response, {
        runtimeAvailable: true,
        model: 'multilingual',
        results: [
            { id: 'fr-channel', language: 'fr', confidence: 0.93, cached: false },
            { id: 'en-channel', language: 'en', confidence: 0.81, cached: false }
        ]
    });
});

test('identity hints send only sanitized channel metadata to Laya', async () => {
    let requestBody;
    const service = new LayaService({
        cache: null,
        fetch: async (url, options) => {
            requestBody = JSON.parse(options.body);
            return {
                ok: true,
                json: async () => ({ results: [{ answers: { sameIdentity: { noul: 0.9, confidence: 0.8 } } }] })
            };
        }
    });
    await service.identityHintBatch([{
        id: 'pair',
        left: { name: 'Sports http://user:pass@example.test/live', group: 'token=secret', source: 'Provider', tvgId: 'one', streamUrl: 'forbidden' },
        right: { name: 'Sports', group: 'Group', source: 'Provider', tvgId: 'two', password: 'forbidden' }
    }]);
    assert.deepEqual(Object.keys(requestBody.states[0].left), ['name', 'group', 'source', 'tvgId']);
    assert.doesNotMatch(JSON.stringify(requestBody), /example\.test|secret|forbidden|user:pass/);
});