import assert from 'node:assert/strict';
import test from 'node:test';
import { ReadableStream } from 'node:stream/web';
import {
  classifySessionProviderErrorMessage,
  consumeSessionEventsUntilFinish,
  eventMatchesRequest,
  parseSessionStreamEvent,
} from './session-reply-wait.mjs';

test('parseSessionStreamEvent parses SSE data payload', () => {
  const event = parseSessionStreamEvent('id: 1\ndata: {"type":"Finish","token_state":null}\n');
  assert.equal(event?.type, 'Finish');
});

test('eventMatchesRequest scopes by request id when present', () => {
  assert.equal(eventMatchesRequest({ request_id: 'req-1' }, 'req-1'), true);
  assert.equal(eventMatchesRequest({ request_id: 'req-2' }, 'req-1'), false);
  assert.equal(eventMatchesRequest({ type: 'Finish' }, 'req-1'), true);
});

test('consumeSessionEventsUntilFinish resolves on Finish', async () => {
  const frames = [
    'data: {"type":"Message","request_id":"req-1","message":{"role":"assistant"}}\n\n',
    'data: {"type":"Finish","request_id":"req-1","token_state":{"totalTokens":12}}\n\n',
  ];
  const stream = new ReadableStream({
    start(controller) {
      for (const frame of frames) controller.enqueue(new TextEncoder().encode(frame));
      controller.close();
    },
  });
  const result = await consumeSessionEventsUntilFinish(stream, { requestId: 'req-1', timeoutMs: 5000 });
  assert.equal(result.finishEvent.type, 'Finish');
  assert.equal(result.tokenState.totalTokens, 12);
});

test('consumeSessionEventsUntilFinish ignores a stale unscoped Finish before request activity', async () => {
  const frames = [
    'data: {"type":"Finish","token_state":{"totalTokens":0}}\n\n',
    'data: {"type":"ActiveRequests","request_id":"req-fresh","request_ids":["req-fresh"]}\n\n',
    'data: {"type":"Finish","request_id":"req-fresh","token_state":{"totalTokens":0}}\n\n',
    'data: {"type":"Message","request_id":"req-fresh","message":{"role":"assistant"}}\n\n',
    'data: {"type":"Finish","token_state":{"totalTokens":12}}\n\n',
  ];
  const stream = new ReadableStream({
    start(controller) {
      for (const frame of frames) controller.enqueue(new TextEncoder().encode(frame));
      controller.close();
    },
  });

  const result = await consumeSessionEventsUntilFinish(stream, {
    requestId: 'req-fresh',
    timeoutMs: 5000,
    requireRequestActivityBeforeUnscopedFinish: true,
  });

  assert.equal(result.tokenState.totalTokens, 12);
});

test('consumeSessionEventsUntilFinish fails fast when an empty Finish has no later activity', async () => {
  const stream = new ReadableStream({
    start(controller) {
      controller.enqueue(new TextEncoder().encode(
        'data: {"type":"Finish","request_id":"req-empty","token_state":{"totalTokens":0}}\n\n',
      ));
    },
  });

  await assert.rejects(
    consumeSessionEventsUntilFinish(stream, {
      requestId: 'req-empty',
      timeoutMs: 5000,
      emptyFinishGraceMs: 5,
      requireRequestActivityBeforeUnscopedFinish: true,
    }),
    (error) => {
      assert.equal(error.code, 'SESSION_EMPTY_FINISH');
      return true;
    },
  );
});

test('consumeSessionEventsUntilFinish records a successful raster generate_image result', async () => {
  const toolResult = JSON.stringify({
    ok: true,
    jobId: 'job-1',
    source: { mimeType: 'image/webp' },
    asset: {
      id: 'asset-1',
      publicUrl: '/MindSpace/user/public/images/hero.webp',
      workspaceRelativePath: 'public/images/hero.webp',
    },
  });
  const frames = [
    `data: ${JSON.stringify({
      type: 'Message', request_id: 'req-1', message: {
        content: [{
          type: 'toolRequest', id: 'call-1',
          toolCall: { value: { name: 'sandbox-fs__generate_image', arguments: { purpose: 'hero' } } },
        }],
      },
    })}\n\n`,
    `data: ${JSON.stringify({
      type: 'Message', request_id: 'req-1', message: {
        content: [{
          type: 'toolResponse', id: 'call-1',
          toolResult: { status: 'success', value: { content: [{ type: 'text', text: toolResult }], isError: false } },
        }],
      },
    })}\n\n`,
    'data: {"type":"Finish","request_id":"req-1"}\n\n',
  ];
  const stream = new ReadableStream({
    start(controller) {
      for (const frame of frames) controller.enqueue(new TextEncoder().encode(frame));
      controller.close();
    },
  });
  const result = await consumeSessionEventsUntilFinish(stream, { requestId: 'req-1', timeoutMs: 5000 });
  assert.equal(result.toolEvidence.generateImage.called, true);
  assert.equal(result.toolEvidence.generateImage.succeeded, true);
  assert.equal(result.toolEvidence.generateImage.jobId, 'job-1');
});

test('consumeSessionEventsUntilFinish surfaces reasoning_content protocol errors before Finish', async () => {
  const frames = [
    `data: ${JSON.stringify({
      type: 'Message',
      request_id: 'req-1',
      message: {
        role: 'assistant',
        content: [{
          type: 'text',
          text: 'Ran into this error: Bad request (400): The reasoning_content in the thinking mode must be passed back to the API.\n\nPlease retry if you think this is a transient or recoverable error.',
        }],
      },
    })}\n\n`,
    'data: {"type":"Finish","request_id":"req-1"}\n\n',
  ];
  const stream = new ReadableStream({
    start(controller) {
      for (const frame of frames) controller.enqueue(new TextEncoder().encode(frame));
      controller.close();
    },
  });

  await assert.rejects(
    consumeSessionEventsUntilFinish(stream, { requestId: 'req-1', timeoutMs: 5000 }),
    (error) => {
      assert.equal(error.code, 'SESSION_REASONING_CONTENT_POISONED');
      assert.match(error.message, /reasoning_content/);
      return true;
    },
  );
});

test('consumeSessionEventsUntilFinish surfaces provider tool history errors before Finish', async () => {
  const frames = [
    `data: ${JSON.stringify({
      type: 'Message',
      request_id: 'req-1',
      message: {
        role: 'assistant',
        content: [{
          type: 'text',
          text: "Ran into this error: Request failed: Bad request (400): An assistant message with 'tool_calls' must be followed by tool messages responding to each 'tool_call_id'. (insufficient tool messages following tool_calls message).\n\nPlease retry if you think this is a transient or recoverable error.",
        }],
      },
    })}\n\n`,
    'data: {"type":"Finish","request_id":"req-1"}\n\n',
  ];
  const stream = new ReadableStream({
    start(controller) {
      for (const frame of frames) controller.enqueue(new TextEncoder().encode(frame));
      controller.close();
    },
  });

  await assert.rejects(
    consumeSessionEventsUntilFinish(stream, { requestId: 'req-1', timeoutMs: 5000 }),
    (error) => {
      assert.equal(error.code, 'SESSION_TOOL_HISTORY_POISONED');
      assert.match(error.message, /tool_calls/);
      return true;
    },
  );
});

test('consumeSessionEventsUntilFinish classifies unsupported visual history as degradable', async () => {
  const message =
    'Request failed: Bad request (400): Failed to deserialize the JSON body into the target type: messages[8]: unknown variant `image_url`, expected `text`';
  assert.equal(
    classifySessionProviderErrorMessage(message),
    'SESSION_VISUAL_CONTEXT_UNSUPPORTED',
  );

  const frames = [
    `data: ${JSON.stringify({
      type: 'Message',
      request_id: 'req-visual',
      message: {
        role: 'assistant',
        content: [{
          type: 'text',
          text: `Ran into this error: ${message}\n\nPlease retry if you think this is a transient or recoverable error.`,
        }],
      },
    })}\n\n`,
    'data: {"type":"Finish","request_id":"req-visual"}\n\n',
  ];
  const stream = new ReadableStream({
    start(controller) {
      for (const frame of frames) controller.enqueue(new TextEncoder().encode(frame));
      controller.close();
    },
  });

  await assert.rejects(
    consumeSessionEventsUntilFinish(stream, {
      requestId: 'req-visual',
      timeoutMs: 5000,
    }),
    (error) => {
      assert.equal(error.code, 'SESSION_VISUAL_CONTEXT_UNSUPPORTED');
      assert.equal(error.retryable, false);
      return true;
    },
  );
});