// @vitest-environment node

import { realpathSync } from 'node:fs';
import { mkdir, mkdtemp, rm, writeFile } from 'node:fs/promises';
import { createRequire } from 'node:module';
import { tmpdir } from 'node:os';
import path from 'node:path';
import { pathToFileURL } from 'node:url';
import { afterEach, describe, expect, it } from 'vitest';
import { createCodingConversationStore } from '../../electron/coding-projects/conversation-store';
import { createCodingProjectAgent } from '../../electron/coding-projects/project-config';
import { CodingProjectService } from '../../electron/coding-projects/project-service';
import {
  createCodingProjectStore,
  createLocalCodingProject,
  createMemoryCodingProjectStorage,
} from '../../electron/coding-projects/project-store';
import { CodingConversationService } from '../../electron/coding-runtime/conversation-service';
import { PiManagedExtensionHost } from '../../electron/coding-runtime/pi/extension-host';
import {
  buildPiProviderCatalog,
  selectPiProviderModel,
} from '../../electron/coding-runtime/pi/provider-config';
import {
  createPiManagedWorkerOpener,
  PiConversationRuntime,
} from '../../electron/coding-runtime/pi/runtime';
import { PiSessionRegistry } from '../../electron/coding-runtime/pi/session-registry';
import { PiWorkerProcess, type PiWorkerProcessOptions } from '../../electron/coding-runtime/pi/worker-process';
import { PiWorkerPool } from '../../electron/coding-runtime/pi/worker-pool';
import type { ProviderAccount } from '../../electron/shared/providers/types';

const roots: string[] = [];
const NOW = '2026-08-25T08:00:00.000Z';
const SOURCE_SESSION_ID = 'c67b7c7b-8364-4dcb-a7f7-913316e8d735';

function electronExecutable(): string {
  const requireFromProject = createRequire(path.resolve('package.json'));
  return requireFromProject('electron') as string;
}

afterEach(async () => {
  await Promise.all(roots.splice(0).map((root) => rm(root, {
    recursive: true,
    force: true,
    maxRetries: 3,
  })));
});

describe('real managed Pi user-entry fork', () => {
  it('forks a persisted Pi 0.84.2 session through the product service and hydrates an independent binding', async () => {
    const root = realpathSync(await mkdtemp(path.join(tmpdir(), 'makelore-pi-real-fork-')));
    roots.push(root);
    const projectPath = path.join(root, 'project');
    const userDataDir = path.join(root, 'user-data');
    const projectStore = createCodingProjectStore(createMemoryCodingProjectStorage(), {
      createId: () => 'project-real-fork',
      now: () => NOW,
    });
    const { project } = await createLocalCodingProject({ projectPath, now: NOW }, projectStore);
    const model = {
      accountId: 'account-real-fork',
      modelId: 'model-real-fork',
      thinkingLevel: 'off' as const,
    };
    await createCodingProjectAgent(projectPath, {
      id: 'agent-real-fork',
      avatarId: 'avatar-01',
      roleName: 'Fork verifier',
      name: 'Fork verifier',
      model,
      modelResolution: 'resolved',
      responsibility: {
        mission: 'Verify a persisted user-entry fork',
        owns: [], boundaries: [], collaborators: [], principles: [],
      },
      skillIds: [],
    }, { now: NOW });
    const store = createCodingConversationStore(projectPath, {
      createId: () => '4ad88774-c373-421b-9c97-5facd368ba66',
      now: () => NOW,
    });
    const source = await store.create({
      agentId: 'agent-real-fork',
      title: 'Persisted source',
      model,
      modelResolution: 'resolved',
    });
    await store.ensureSessionBinding(source.id, async () => ({
      piSessionId: SOURCE_SESSION_ID,
      sessionKey: SOURCE_SESSION_ID,
    }));

    const sessionDirectory = path.join(
      userDataDir,
      'coding-runtime',
      'pi',
      'sessions',
      project.id,
    );
    await mkdir(sessionDirectory, { recursive: true });
    const sessionEntries = [
      { type: 'session', version: 3, id: SOURCE_SESSION_ID, timestamp: NOW, cwd: project.path },
      {
        type: 'message', id: 'entry-user-real-fork', parentId: null, timestamp: NOW,
        message: { role: 'user', content: 'Persisted user fork source', timestamp: 1 },
      },
      {
        type: 'message', id: 'entry-assistant-real-fork', parentId: 'entry-user-real-fork', timestamp: NOW,
        message: {
          role: 'assistant',
          content: [{ type: 'text', text: 'Persisted assistant response' }],
          usage: {
            input: 1, output: 1, cacheRead: 0, cacheWrite: 0, totalTokens: 2,
            cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
          },
          stopReason: 'stop',
          timestamp: 2,
        },
      },
    ];
    await writeFile(
      path.join(sessionDirectory, `2026-08-25T08-00-00-000Z_${SOURCE_SESSION_ID}.jsonl`),
      `${sessionEntries.map((entry) => JSON.stringify(entry)).join('\n')}\n`,
    );
    const packageRoot = realpathSync(path.resolve(
      'node_modules', '@earendil-works', 'pi-coding-agent',
    ));
    const { SessionManager } = await import(pathToFileURL(
      path.join(packageRoot, 'dist', 'core', 'session-manager.js'),
    ).href) as {
      SessionManager: { list(cwd: string, sessionDir: string): Promise<Array<{ id: string }>> };
    };
    expect(await SessionManager.list(project.path, sessionDirectory)).toEqual([
      expect.objectContaining({ id: SOURCE_SESSION_ID }),
    ]);

    const account: ProviderAccount = {
      id: model.accountId,
      vendorId: 'custom',
      label: 'Local fork proof account',
      authMode: 'local',
      apiProtocol: 'openai-completions',
      baseUrl: 'http://127.0.0.1:9/v1',
      model: model.modelId,
      enabled: true,
      isDefault: true,
      createdAt: NOW,
      updatedAt: NOW,
    };
    const providerInput = { accounts: [account], modelSummaries: [] };
    const registry = new PiSessionRegistry({ projectStore });
    const extensionHost = new PiManagedExtensionHost();
    const processOptions: PiWorkerProcessOptions[] = [];
    const pool = new PiWorkerPool({
      maxIdle: 2,
      openWorker: createPiManagedWorkerOpener({
        registry,
        executablePath: electronExecutable(),
        cliPath: path.join(packageRoot, 'dist', 'cli.js'),
        userDataDir,
        bundledSkillsDir: path.resolve('resources/coding-skills'),
        extensionHost,
        loadProviderInput: async () => providerInput,
        resolveCredential: async () => null,
        createProcess: (options) => {
          processOptions.push(options);
          return new PiWorkerProcess(options);
        },
      }),
    });
    const runtime = new PiConversationRuntime({
      pool,
      registry,
      extensionHost,
      resolveModel: async (candidate) => selectPiProviderModel(
        buildPiProviderCatalog(providerInput),
        candidate,
      ),
    });
    const service = new CodingConversationService(
      new CodingProjectService(projectStore),
      runtime,
    );

    try {
      const sourceSnapshot = await service.getSnapshot(source.id);
      expect(processOptions[0]?.sessionDir).toBe(sessionDirectory);
      expect(processOptions[0]?.cwd).toBe(project.path);
      expect(sourceSnapshot.nodes).toEqual(expect.arrayContaining([
        expect.objectContaining({
          kind: 'message', role: 'user', sourceEntryId: 'entry-user-real-fork', status: 'complete',
        }),
        expect.objectContaining({
          kind: 'message', role: 'assistant', sourceEntryId: 'entry-assistant-real-fork', status: 'complete',
        }),
      ]));

      const forked = await service.fork(source.id, 'entry-user-real-fork');
      const [sourceAfterFork, forkedSnapshot, sourceBinding, forkedBinding] = await Promise.all([
        service.getSnapshot(source.id),
        service.getSnapshot(forked.id),
        store.get(source.id),
        store.get(forked.id),
      ]);
      expect(forked.agentId).toBe(source.agentId);
      expect(forkedSnapshot).toMatchObject({
        conversation: { id: forked.id, agentId: source.agentId },
        nodes: [],
        run: { status: 'idle' },
        worker: { status: 'ready' },
      });
      expect(sourceAfterFork.nodes).toEqual(sourceSnapshot.nodes);
      expect(sourceBinding).toMatchObject({
        piSessionId: SOURCE_SESSION_ID,
        sessionKey: SOURCE_SESSION_ID,
      });
      expect(forkedBinding?.piSessionId).toBeTruthy();
      expect(forkedBinding?.sessionKey).toBeTruthy();
      expect(forkedBinding?.piSessionId).not.toBe(sourceBinding?.piSessionId);
      expect(forkedBinding?.sessionKey).not.toBe(sourceBinding?.sessionKey);
      expect(runtime.getDiagnostics().workers).toHaveLength(2);
    } finally {
      await runtime.shutdown();
      await extensionHost.close();
    }
    expect(runtime.getDiagnostics().workers).toHaveLength(0);
  }, 30_000);
});