import { BadRequestException, ConflictException, NotFoundException } from '@nestjs/common';
import { AUDIT_ACTIONS, AuditService } from '../audit/audit.service';
import type { AppConfig } from '../config/config.tokens';
import type { ActingUser } from '../users/users.service';
import { ModuleHealthChecker } from './module-health-checker';
import { ModuleInstaller } from './module-installer';
import { ModuleProcessManager } from './module-process-manager';
import { ModuleRepository } from './module.repository';
import type { ModuleManifest, ModuleRecord } from './manifest.types';
import { ModulesService } from './modules.service';

/** Gültiges Test-Manifest. */
function createManifest(overrides: Partial<ModuleManifest> = {}): ModuleManifest {
  return {
    id: 'calendar',
    name: 'Kalender',
    version: '1.0.0',
    slug: 'kalender-tool',
    description: 'Kalenderverwaltung',
    author: 'MPM',
    runtime: 'node',
    entrypoint: 'server.js',
    port: 41001,
    healthcheck: '/health',
    apiVersion: 'v1',
    configuration: [],
    ...overrides,
  };
}

/** Erzeugt einen Modul-Datensatz für Tests. */
function createModuleRecord(overrides: Partial<ModuleRecord> = {}): ModuleRecord {
  const manifest = createManifest();
  return {
    id: 'module-1',
    moduleId: manifest.id,
    name: manifest.name,
    slug: manifest.slug,
    version: manifest.version,
    description: manifest.description,
    author: manifest.author,
    path: '/data/modules/calendar',
    status: 'STOPPED',
    internalPort: manifest.port,
    healthcheckUrl: manifest.healthcheck,
    enabled: true,
    createdAt: new Date(),
    updatedAt: new Date(),
    configuration: [],
    configurationReady: true,
    ...overrides,
  };
}

const ACTOR: ActingUser = { id: 'admin-1', username: 'admin' };

/** Mock des ModuleRepository. */
class MockModuleRepository {
  public modules: ModuleRecord[] = [];
  public statusUpdates: Array<{ id: string; status: ModuleRecord['status'] }> = [];
  public enabledUpdates: Array<{ id: string; enabled: boolean }> = [];
  public deletedIds: string[] = [];

  async list(): Promise<ModuleRecord[]> {
    return this.modules;
  }

  async findById(id: string): Promise<ModuleRecord | null> {
    return this.modules.find((module) => module.id === id) ?? null;
  }

  async findByModuleId(moduleId: string): Promise<ModuleRecord | null> {
    return this.modules.find((module) => module.moduleId === moduleId) ?? null;
  }

  async findBySlug(slug: string): Promise<ModuleRecord | null> {
    return this.modules.find((module) => module.slug === slug) ?? null;
  }

  async findByPort(port: number): Promise<ModuleRecord | null> {
    return this.modules.find((module) => module.internalPort === port) ?? null;
  }

  async create(manifest: ModuleManifest, directory: string): Promise<ModuleRecord> {
    const module = createModuleRecord({
      id: 'new-module',
      moduleId: manifest.id,
      name: manifest.name,
      slug: manifest.slug,
      version: manifest.version,
      path: directory,
      internalPort: manifest.port,
      healthcheckUrl: manifest.healthcheck,
    });
    this.modules.push(module);
    return module;
  }

  async updateStatus(id: string, status: ModuleRecord['status']): Promise<void> {
    this.statusUpdates.push({ id, status });
    const module = this.modules.find((m) => m.id === id);
    if (module) {
      (module as { status: ModuleRecord['status'] }).status = status;
    }
  }

  async updateEnabled(id: string, enabled: boolean): Promise<void> {
    this.enabledUpdates.push({ id, enabled });
    const module = this.modules.find((m) => m.id === id);
    if (module) {
      (module as { enabled: boolean }).enabled = enabled;
    }
  }

  async delete(id: string): Promise<void> {
    this.deletedIds.push(id);
    this.modules = this.modules.filter((m) => m.id !== id);
  }
}

/** Mock des ModuleInstaller. */
class MockModuleInstaller {
  public validateResult: ModuleManifest = createManifest();
  public installed: Array<{ moduleId: string }> = [];
  public removed: string[] = [];

  async validatePackage(): Promise<ModuleManifest> {
    return this.validateResult;
  }

  async install(
    _buffer: Buffer,
    manifest: ModuleManifest,
    _modulesDir: string,
  ): Promise<{ directory: string; manifest: ModuleManifest }> {
    this.installed.push({ moduleId: manifest.id });
    return { directory: `/data/modules/${manifest.id}`, manifest };
  }

  async remove(_modulesDir: string, moduleId: string): Promise<void> {
    this.removed.push(moduleId);
  }
}

/** Mock des ModuleProcessManager. */
class MockProcessManager {
  public started: string[] = [];
  public stopped: string[] = [];

  async start(module: ModuleRecord): Promise<void> {
    this.started.push(module.moduleId);
  }

  async stop(moduleId: string): Promise<void> {
    this.stopped.push(moduleId);
  }

  isRunning(moduleId: string): boolean {
    return this.started.includes(moduleId) && !this.stopped.includes(moduleId);
  }
}

/** Mock des ModuleHealthChecker. */
class MockHealthChecker {
  public healthy = true;

  async check(): Promise<{ healthy: boolean; latencyMs: number; detail: string }> {
    return { healthy: this.healthy, latencyMs: 5, detail: this.healthy ? 'healthy' : 'unreachable' };
  }
}

/** Mock des AuditService. */
class MockAuditService {
  public records: Array<{ action: string }> = [];

  async record(entry: { action: string }): Promise<void> {
    this.records.push(entry);
  }
}

/** Test-Konfiguration. */
const TEST_CONFIG: AppConfig = {
  nodeEnv: 'test',
  port: 3000,
  database: { url: 'postgresql://test' },
  security: {
    sessionTtlMinutes: 120,
    cookieSecure: false,
    behindProxy: false,
    loginMaxAttempts: 5,
    loginLockoutMinutes: 15,
    loginRateLimitAttempts: 10,
    loginRateLimitWindowMinutes: 5,
  },
  adminSeed: { username: 'admin', email: 'admin@example.com', password: 'password-123' },
  runtime: { modulesDir: '/data/modules', logsDir: '/data/logs', moduleConfigurationEncryptionKey: '' },
  marketplace: { publicUrl: 'http://127.0.0.1:8081', tokenEncryptionKey: '', providers: {} },
};

describe('ModulesService', () => {
  let repository: MockModuleRepository;
  let installer: MockModuleInstaller;
  let processManager: MockProcessManager;
  let healthChecker: MockHealthChecker;
  let auditService: MockAuditService;
  let modulesService: ModulesService;

  beforeEach(() => {
    repository = new MockModuleRepository();
    installer = new MockModuleInstaller();
    processManager = new MockProcessManager();
    healthChecker = new MockHealthChecker();
    auditService = new MockAuditService();
    modulesService = new ModulesService(
      repository as unknown as ModuleRepository,
      installer as unknown as ModuleInstaller,
      processManager as unknown as ModuleProcessManager,
      healthChecker as unknown as ModuleHealthChecker,
      auditService as unknown as AuditService,
      { resolvedValues: async () => ({}), state: async () => ({ ready: true, fields: [] }), save: async () => ({ state: { ready: true, fields: [] }, changedKeys: [] }) } as never,
      TEST_CONFIG,
    );
  });

  describe('install', () => {
    it('installiert ein neues Modul und schreibt Audit', async () => {
      const module = await modulesService.install(Buffer.from('zip'), ACTOR, null);
      expect(module.moduleId).toBe('calendar');
      expect(installer.installed).toEqual([{ moduleId: 'calendar' }]);
      expect(auditService.records.at(-1)?.action).toBe(AUDIT_ACTIONS.MODULE_INSTALLED);
    });

    it('lehnt doppelte Modul-IDs ab', async () => {
      repository.modules = [createModuleRecord()];
      await expect(modulesService.install(Buffer.from('zip'), ACTOR, null)).rejects.toThrow(
        ConflictException,
      );
    });

    it('lehnt doppelte Slugs ab', async () => {
      repository.modules = [createModuleRecord({ moduleId: 'anderes', slug: 'kalender-tool' })];
      await expect(modulesService.install(Buffer.from('zip'), ACTOR, null)).rejects.toThrow(
        ConflictException,
      );
    });

    it('lehnt belegte Ports ab', async () => {
      repository.modules = [createModuleRecord({ moduleId: 'anderes', slug: 'anderer-slug' })];
      await expect(modulesService.install(Buffer.from('zip'), ACTOR, null)).rejects.toThrow(
        ConflictException,
      );
    });
  });

  describe('start', () => {
    it('startet ein gestopptes Modul (STARTING → RUNNING)', async () => {
      repository.modules = [createModuleRecord({ status: 'STOPPED' })];
      const module = await modulesService.start('module-1', ACTOR, null);
      expect(module.status).toBe('RUNNING');
      expect(processManager.started).toEqual(['calendar']);
      expect(auditService.records.at(-1)?.action).toBe(AUDIT_ACTIONS.MODULE_STARTED);
    });

    it('setzt ERROR bei fehlgeschlagenem Healthcheck', async () => {
      repository.modules = [createModuleRecord({ status: 'STOPPED' })];
      healthChecker.healthy = false;
      await expect(modulesService.start('module-1', ACTOR, null)).rejects.toThrow(
        BadRequestException,
      );
      expect(repository.statusUpdates).toContainEqual({ id: 'module-1', status: 'ERROR' });
      expect(processManager.stopped).toEqual(['calendar']);
    });

    it('lehnt Start deaktivierter Module ab', async () => {
      repository.modules = [createModuleRecord({ enabled: false })];
      await expect(modulesService.start('module-1', ACTOR, null)).rejects.toThrow(
        BadRequestException,
      );
    });

    it('wirft NotFoundException bei unbekannter ID', async () => {
      await expect(modulesService.start('unbekannt', ACTOR, null)).rejects.toThrow(
        NotFoundException,
      );
    });
  });

  describe('stop', () => {
    it('stoppt ein laufendes Modul (STOPPING → STOPPED)', async () => {
      repository.modules = [createModuleRecord({ status: 'RUNNING' })];
      const module = await modulesService.stop('module-1', ACTOR, null);
      expect(module.status).toBe('STOPPED');
      expect(processManager.stopped).toEqual(['calendar']);
      expect(auditService.records.at(-1)?.action).toBe(AUDIT_ACTIONS.MODULE_STOPPED);
    });
  });

  describe('restart', () => {
    it('stoppt und startet ein laufendes Modul', async () => {
      repository.modules = [createModuleRecord({ status: 'RUNNING' })];
      const module = await modulesService.restart('module-1', ACTOR, null);
      expect(module.status).toBe('RUNNING');
      expect(processManager.stopped).toEqual(['calendar']);
      expect(processManager.started).toEqual(['calendar']);
      expect(auditService.records.at(-1)?.action).toBe(AUDIT_ACTIONS.MODULE_STARTED);
    });
  });

  describe('setEnabled', () => {
    it('deaktiviert ein laufendes Modul (stoppt es zuerst)', async () => {
      repository.modules = [createModuleRecord({ status: 'RUNNING' })];
      const module = await modulesService.setEnabled('module-1', false, ACTOR, null);
      expect(module.enabled).toBe(false);
      expect(module.status).toBe('DISABLED');
      expect(processManager.stopped).toEqual(['calendar']);
      expect(auditService.records.at(-1)?.action).toBe(AUDIT_ACTIONS.MODULE_DISABLED);
    });

    it('aktiviert ein deaktiviertes Modul', async () => {
      repository.modules = [createModuleRecord({ enabled: false, status: 'DISABLED' })];
      const module = await modulesService.setEnabled('module-1', true, ACTOR, null);
      expect(module.enabled).toBe(true);
      expect(module.status).toBe('STOPPED');
      expect(auditService.records.at(-1)?.action).toBe(AUDIT_ACTIONS.MODULE_ENABLED);
    });
  });

  describe('remove', () => {
    it('stoppt, löscht Registry-Eintrag und Dateien', async () => {
      repository.modules = [createModuleRecord({ status: 'RUNNING' })];
      await modulesService.remove('module-1', ACTOR, null);
      expect(processManager.stopped).toEqual(['calendar']);
      expect(repository.deletedIds).toEqual(['module-1']);
      expect(installer.removed).toEqual(['calendar']);
      expect(auditService.records.at(-1)?.action).toBe(AUDIT_ACTIONS.MODULE_REMOVED);
    });
  });
});