import { promises as fs } from 'node:fs';
import * as http from 'node:http';
import * as os from 'node:os';
import * as path from 'node:path';

import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';

import {
  getTeamsBasePath,
  setClaudeBasePathOverride,
} from '../../../../src/main/utils/pathDecoder';

import { formatProgressDump } from './memberWorkSyncLiveHarness';
import {
  createOpenCodeLiveHarness,
  type OpenCodeLiveHarness,
  waitForOpenCodeLanesStopped,
  waitUntil,
} from './openCodeLiveTestHarness';

import type { TeamProvisioningProgress } from '../../../../src/shared/types';

const liveDescribe =
  process.env.OPENCODE_E2E === '1' && process.env.OPENCODE_E2E_LOCAL_PROVIDER_APP_LAUNCH === '1'
    ? describe
    : describe.skip;

const LOCAL_MODEL = 'llama.cpp/qwen-test:0.5b';

liveDescribe('OpenCode local provider app launch live e2e', () => {
  let tempDir: string;
  let tempClaudeRoot: string;
  let fakeServer: FakeOpenAiCompatibleServer | null;
  let harness: OpenCodeLiveHarness | null;
  let teamName: string | null;

  beforeEach(async () => {
    tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'opencode-local-provider-app-launch-'));
    tempClaudeRoot = path.join(tempDir, '.claude');
    await fs.mkdir(tempClaudeRoot, { recursive: true });
    setClaudeBasePathOverride(tempClaudeRoot);
    fakeServer = null;
    harness = null;
    teamName = null;
  });

  afterEach(async () => {
    if (harness && teamName) {
      await harness.svc.stopTeam(teamName).catch(() => undefined);
      await waitForOpenCodeLanesStopped(teamName);
    }
    await harness?.dispose().catch(() => undefined);
    await fakeServer?.close().catch(() => undefined);
    setClaudeBasePathOverride(null);
    if (process.env.OPENCODE_E2E_KEEP_TEMP === '1') {
      console.info(`[OpenCodeLocalProviderAppLaunch.live] preserved temp dir: ${tempDir}`);
    } else {
      await fs.rm(tempDir, { recursive: true, force: true });
    }
    clearBenignSlowConfigReadWarnings();
  }, 90_000);

  it(
    'creates and stops an OpenCode team through the app service using a configured authless local provider',
    async () => {
      const projectPath = path.join(tempDir, 'project');
      await fs.mkdir(projectPath, { recursive: true });
      await fs.writeFile(
        path.join(projectPath, 'README.md'),
        '# OpenCode local provider app launch live e2e\n',
        'utf8'
      );
      fakeServer = await startFakeOpenAiCompatibleServer();
      await writeFakeLocalOpenCodeConfig({
        projectPath,
        baseUrl: fakeServer.baseUrl,
      });

      harness = await createOpenCodeLiveHarness({
        tempDir,
        selectedModel: LOCAL_MODEL,
        projectPath,
      });

      teamName = `opencode-local-provider-app-${Date.now()}`;
      const progressEvents: TeamProvisioningProgress[] = [];
      const { runId } = await harness.svc.createTeam(
        {
          teamName,
          cwd: projectPath,
          providerId: 'opencode',
          model: LOCAL_MODEL,
          skipPermissions: true,
          members: [
            {
              name: 'bob',
              role: 'Developer',
              providerId: 'opencode',
              model: LOCAL_MODEL,
              mcpPolicy: { mode: 'appOnly' },
            },
          ],
        },
        (progress) => progressEvents.push(progress)
      );

      const progressDump = formatProgressDump(progressEvents);
      expect(runId, progressDump).toBeTruthy();
      expect(
        progressEvents.some((progress) =>
          progress.message.includes('OpenCode team launch is ready')
        ),
        progressDump
      ).toBe(true);
      expect(progressDump).not.toContain('provider not connected');
      expect(progressDump).not.toContain('not authenticated');
      expect(progressDump).not.toContain('OpenCode team launch is not enabled');
      expect(fakeServer.requests, progressDump).toContain('POST /v1/chat/completions');

      const runtimeSnapshot = await harness.svc.getTeamAgentRuntimeSnapshot(teamName);
      expect(runtimeSnapshot.runId).toBe(runId);
      expect(runtimeSnapshot.members.bob).toMatchObject({
        alive: true,
        providerId: 'opencode',
        laneId: 'primary',
        laneKind: 'primary',
        runtimeModel: LOCAL_MODEL,
        historicalBootstrapConfirmed: true,
      });

      const deliveryMarker = `local-provider-delivery-${Date.now()}`;
      const chatBodyCountBeforeDelivery = fakeServer.chatBodies.length;
      const delivery = await harness.svc.deliverOpenCodeMemberMessage(teamName, {
        memberName: 'bob',
        messageId: `local-provider-delivery-${Date.now()}`,
        replyRecipient: 'user',
        source: 'manual',
        text: [
          `Local provider delivery marker: ${deliveryMarker}`,
          'Answer with PONG. Do not edit files.',
        ].join('\n'),
      });
      expect(delivery.delivered, JSON.stringify(delivery, null, 2)).toBe(true);
      await waitUntil(
        async () =>
          fakeServer!.chatBodies.length > chatBodyCountBeforeDelivery &&
          fakeServer!.chatBodies.some((body) => JSON.stringify(body).includes(deliveryMarker)),
        60_000,
        500
      );

      await harness.svc.stopTeam(teamName);
      await waitForOpenCodeLanesStopped(teamName);
      clearBenignSlowConfigReadWarnings();
    },
    300_000
  );

  it(
    'fails app service launch for an unknown local model before creating OpenCode lanes',
    async () => {
      const projectPath = path.join(tempDir, 'unknown-model-project');
      await fs.mkdir(projectPath, { recursive: true });
      fakeServer = await startFakeOpenAiCompatibleServer();
      await writeFakeLocalOpenCodeConfig({
        projectPath,
        baseUrl: fakeServer.baseUrl,
      });

      harness = await createOpenCodeLiveHarness({
        tempDir,
        selectedModel: 'llama.cpp/missing-test:0.5b',
        projectPath,
      });

      teamName = `opencode-local-provider-unknown-${Date.now()}`;
      const progressEvents: TeamProvisioningProgress[] = [];
      const { runId } = await harness.svc.createTeam(
        {
          teamName,
          cwd: projectPath,
          providerId: 'opencode',
          model: 'llama.cpp/missing-test:0.5b',
          skipPermissions: true,
          members: [
            {
              name: 'bob',
              role: 'Developer',
              providerId: 'opencode',
              model: 'llama.cpp/missing-test:0.5b',
            },
          ],
        },
        (progress) => progressEvents.push(progress)
      );
      expect(runId).toBeTruthy();
      await waitUntil(
        async () => progressEvents.some((progress) => progress.state === 'failed'),
        30_000,
        500
      );

      const progressDump = formatProgressDump(progressEvents);
      expect(progressEvents.some((progress) => progress.state === 'failed'), progressDump).toBe(
        true
      );
      expect(progressDump).toMatch(/missing-test:0\.5b|not available|unavailable/i);
      expect(fakeServer.requests, progressDump).not.toContain('POST /v1/chat/completions');
      await waitUntil(
        async () => {
          const laneIndexPath = path.join(
            getTeamsBasePath(),
            teamName!,
            'runtime',
            'opencode',
            'lanes.json'
          );
          try {
            const parsed = JSON.parse(await fs.readFile(laneIndexPath, 'utf8')) as {
              lanes?: Record<string, unknown>;
            };
            return Object.keys(parsed.lanes ?? {}).length === 0;
          } catch (error) {
            if ((error as NodeJS.ErrnoException).code === 'ENOENT') {
              return true;
            }
            throw error;
          }
        },
        15_000,
        500
      );
      clearBenignSlowConfigReadWarnings();
    },
    180_000
  );
});

interface FakeOpenAiCompatibleServer {
  baseUrl: string;
  requests: string[];
  chatBodies: unknown[];
  close: () => Promise<void>;
}

async function startFakeOpenAiCompatibleServer(): Promise<FakeOpenAiCompatibleServer> {
  const requests: string[] = [];
  const chatBodies: unknown[] = [];
  const server = http.createServer(async (request, response) => {
    requests.push(`${request.method ?? 'GET'} ${request.url ?? '/'}`);
    if (request.url === '/v1/models') {
      sendJson(response, 200, {
        object: 'list',
        data: [{ id: 'qwen-test:0.5b', object: 'model' }],
      });
      return;
    }

    if (request.method === 'POST' && request.url === '/v1/chat/completions') {
      const body = JSON.parse((await readRequestBody(request)) || '{}') as { stream?: boolean };
      chatBodies.push(body);
      if (body.stream) {
        const created = Math.floor(Date.now() / 1000);
        response.writeHead(200, {
          'content-type': 'text/event-stream',
          'cache-control': 'no-cache',
        });
        response.write(
          `data: ${JSON.stringify({
            id: 'chatcmpl-test',
            object: 'chat.completion.chunk',
            created,
            model: 'qwen-test:0.5b',
            choices: [
              {
                index: 0,
                delta: { role: 'assistant', content: 'PONG' },
                finish_reason: null,
              },
            ],
          })}\n\n`
        );
        response.write(
          `data: ${JSON.stringify({
            id: 'chatcmpl-test',
            object: 'chat.completion.chunk',
            created,
            model: 'qwen-test:0.5b',
            choices: [{ index: 0, delta: {}, finish_reason: 'stop' }],
          })}\n\n`
        );
        response.end('data: [DONE]\n\n');
        return;
      }

      sendJson(response, 200, {
        id: 'chatcmpl-test',
        object: 'chat.completion',
        model: 'qwen-test:0.5b',
        choices: [
          {
            index: 0,
            message: { role: 'assistant', content: 'PONG' },
            finish_reason: 'stop',
          },
        ],
      });
      return;
    }

    sendJson(response, 404, { error: { message: 'not found' } });
  });

  await new Promise<void>((resolve, reject) => {
    server.once('error', reject);
    server.listen(0, '127.0.0.1', resolve);
  });
  const address = server.address();
  if (!address || typeof address === 'string') {
    await closeServer(server);
    throw new Error('Fake OpenAI-compatible server did not bind to a TCP port');
  }

  return {
    baseUrl: `http://127.0.0.1:${address.port}`,
    requests,
    chatBodies,
    close: () => closeServer(server),
  };
}

async function writeFakeLocalOpenCodeConfig(input: {
  projectPath: string;
  baseUrl: string;
}): Promise<void> {
  const configPath = path.join(input.projectPath, 'opencode.json');
  await fs.writeFile(
    configPath,
    `${JSON.stringify(
      {
        provider: {
          'llama.cpp': {
            npm: '@ai-sdk/openai-compatible',
            options: {
              baseURL: `${input.baseUrl}/v1`,
            },
            models: {
              'qwen-test:0.5b': {},
            },
          },
        },
        model: LOCAL_MODEL,
        small_model: LOCAL_MODEL,
      },
      null,
      2
    )}\n`,
    'utf8'
  );
}

async function readRequestBody(request: http.IncomingMessage): Promise<string> {
  const chunks: Buffer[] = [];
  for await (const chunk of request) {
    chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk));
  }
  return Buffer.concat(chunks).toString('utf8');
}

function sendJson(response: http.ServerResponse, status: number, body: unknown): void {
  response.writeHead(status, { 'content-type': 'application/json' });
  response.end(JSON.stringify(body));
}

function closeServer(server: http.Server): Promise<void> {
  return new Promise((resolve, reject) => {
    server.close((error) => (error ? reject(error) : resolve()));
  });
}

function clearBenignSlowConfigReadWarnings(): void {
  const warn = vi.mocked(console.warn);
  if (
    warn.mock.calls.length > 0 &&
    warn.mock.calls.every((call) =>
      call.map((part) => String(part)).join(' ').includes('[getConfig] slow read diag=')
    )
  ) {
    warn.mockClear();
  }
}