import { describe, it, expect, vi, beforeEach } from 'vitest';
import type { K8sClientConfig } from '../src/services/k8s/k8s-client.js';

// Mock the K8sClient before importing KubernetesOrchestrator
vi.mock('../src/services/k8s/k8s-client.js', () => {
  class MockK8sClient {
    defaultNamespace: string;
    // Store mock handlers so tests can override
    _handlers = new Map<string, { statusCode: number; body: unknown }>();

    constructor(config: K8sClientConfig) {
      this.defaultNamespace = config.namespace ?? 'default';
    }

    _setResponse(key: string, statusCode: number, body: unknown) {
      this._handlers.set(key, { statusCode, body });
    }

    _getResponse(key: string) {
      return this._handlers.get(key) ?? { statusCode: 200, body: {} };
    }

    async get(path: string) { return this._getResponse(`GET:${path}`); }
    async post(path: string, _body: unknown) { return this._getResponse(`POST:${path}`); }
    async delete(path: string) { return this._getResponse(`DELETE:${path}`); }
    async patch(path: string, _body: unknown) { return this._getResponse(`PATCH:${path}`); }
    async getLogs(_ns: string, _pod: string, _opts?: unknown) {
      return this._getResponse('LOGS')?.body ?? '';
    }
  }

  return {
    K8sClient: MockK8sClient,
    loadDefaultConfig: vi.fn(),
    parseKubeconfig: vi.fn(),
  };
});

import { KubernetesOrchestrator } from '../src/services/k8s/kubernetes-orchestrator.js';
import type { ContainerSpec } from '../src/services/orchestrator.js';

function getClient(orch: KubernetesOrchestrator): {
  _setResponse(key: string, statusCode: number, body: unknown): void;
} {
  // Access private client for test setup
  return (orch as unknown as { client: { _setResponse(k: string, sc: number, b: unknown): void } }).client;
}

const testConfig: K8sClientConfig = {
  apiServer: 'https://localhost:6443',
  token: 'test-token',
  namespace: 'test-ns',
};

const testSpec: ContainerSpec = {
  image: 'mcpctl/server:latest',
  name: 'my-server',
  env: { PORT: '3000' },
  containerPort: 3000,
};

const podStatusRunning = {
  metadata: {
    name: 'my-server',
    namespace: 'test-ns',
    creationTimestamp: '2026-01-01T00:00:00Z',
    labels: { 'mcpctl.managed': 'true' },
  },
  status: {
    phase: 'Running',
    containerStatuses: [{
      state: { running: { startedAt: '2026-01-01T00:00:00Z' } },
    }],
  },
  spec: {
    containers: [{ ports: [{ containerPort: 3000 }] }],
  },
};

const podStatusPending = {
  metadata: {
    name: 'my-server',
    namespace: 'test-ns',
    creationTimestamp: '2026-01-01T00:00:00Z',
  },
  status: {
    phase: 'Pending',
    containerStatuses: [{
      state: { waiting: { reason: 'ContainerCreating' } },
    }],
  },
};

describe('KubernetesOrchestrator', () => {
  let orch: KubernetesOrchestrator;

  beforeEach(() => {
    orch = new KubernetesOrchestrator(testConfig);
  });

  describe('ping', () => {
    it('returns true on successful API call', async () => {
      getClient(orch)._setResponse('GET:/api/v1', 200, { kind: 'APIResourceList' });
      expect(await orch.ping()).toBe(true);
    });

    it('returns false on error', async () => {
      getClient(orch)._setResponse('GET:/api/v1', 500, { message: 'internal error' });
      expect(await orch.ping()).toBe(false);
    });
  });

  describe('pullImage', () => {
    it('is a no-op for K8s', async () => {
      await expect(orch.pullImage('some-image:latest')).resolves.toBeUndefined();
    });
  });

  describe('createContainer', () => {
    it('creates a pod and returns container info', async () => {
      const client = getClient(orch);
      // ensureNamespace check
      client._setResponse('GET:/api/v1/namespaces/test-ns', 200, {});
      // create pod
      client._setResponse('POST:/api/v1/namespaces/test-ns/pods', 201, podStatusRunning);
      // inspect after creation
      client._setResponse('GET:/api/v1/namespaces/test-ns/pods/my-server', 200, podStatusRunning);

      const info = await orch.createContainer(testSpec);
      expect(info.containerId).toBe('my-server');
      expect(info.state).toBe('running');
      expect(info.port).toBe(3000);
    });

    it('throws on API error', async () => {
      const client = getClient(orch);
      client._setResponse('GET:/api/v1/namespaces/test-ns', 200, {});
      client._setResponse('POST:/api/v1/namespaces/test-ns/pods', 422, {
        message: 'pod already exists',
      });

      await expect(orch.createContainer(testSpec)).rejects.toThrow('Failed to create pod');
    });
  });

  describe('inspectContainer', () => {
    it('returns running container info', async () => {
      getClient(orch)._setResponse('GET:/api/v1/namespaces/test-ns/pods/my-server', 200, podStatusRunning);

      const info = await orch.inspectContainer('my-server');
      expect(info.state).toBe('running');
      expect(info.name).toBe('my-server');
    });

    it('maps pending state correctly', async () => {
      getClient(orch)._setResponse('GET:/api/v1/namespaces/test-ns/pods/my-server', 200, podStatusPending);

      const info = await orch.inspectContainer('my-server');
      expect(info.state).toBe('starting');
    });

    it('throws on 404', async () => {
      getClient(orch)._setResponse('GET:/api/v1/namespaces/test-ns/pods/missing', 404, {
        message: 'pods "missing" not found',
      });

      await expect(orch.inspectContainer('missing')).rejects.toThrow('not found');
    });
  });

  describe('stopContainer', () => {
    it('deletes the pod', async () => {
      getClient(orch)._setResponse('DELETE:/api/v1/namespaces/test-ns/pods/my-server', 200, {});
      await expect(orch.stopContainer('my-server')).resolves.toBeUndefined();
    });
  });

  describe('removeContainer', () => {
    it('deletes the pod successfully', async () => {
      getClient(orch)._setResponse('DELETE:/api/v1/namespaces/test-ns/pods/my-server', 200, {});
      await expect(orch.removeContainer('my-server')).resolves.toBeUndefined();
    });

    it('ignores 404 (already deleted)', async () => {
      getClient(orch)._setResponse('DELETE:/api/v1/namespaces/test-ns/pods/my-server', 404, {});
      await expect(orch.removeContainer('my-server')).resolves.toBeUndefined();
    });

    it('throws on other errors', async () => {
      getClient(orch)._setResponse('DELETE:/api/v1/namespaces/test-ns/pods/my-server', 403, {
        message: 'forbidden',
      });
      await expect(orch.removeContainer('my-server')).rejects.toThrow('Failed to delete pod');
    });
  });

  describe('getContainerLogs', () => {
    it('returns logs from pod', async () => {
      getClient(orch)._setResponse('LOGS', 200, 'log line 1\nlog line 2\n');

      const logs = await orch.getContainerLogs('my-server');
      expect(logs.stdout).toBe('log line 1\nlog line 2\n');
      expect(logs.stderr).toBe('');
    });
  });

  describe('listContainers', () => {
    it('lists managed pods', async () => {
      getClient(orch)._setResponse(
        'GET:/api/v1/namespaces/test-ns/pods?labelSelector=mcpctl.managed%3Dtrue',
        200,
        { items: [podStatusRunning] },
      );

      const containers = await orch.listContainers();
      expect(containers).toHaveLength(1);
      expect(containers[0]!.containerId).toBe('my-server');
      expect(containers[0]!.state).toBe('running');
    });

    it('returns empty on API error', async () => {
      getClient(orch)._setResponse(
        'GET:/api/v1/namespaces/test-ns/pods?labelSelector=mcpctl.managed%3Dtrue',
        500,
        {},
      );

      const containers = await orch.listContainers();
      expect(containers).toEqual([]);
    });
  });

  describe('ensureNamespace', () => {
    it('does nothing if namespace exists', async () => {
      getClient(orch)._setResponse('GET:/api/v1/namespaces/test-ns', 200, {});
      await expect(orch.ensureNamespace('test-ns')).resolves.toBeUndefined();
    });

    it('creates namespace if not found', async () => {
      const client = getClient(orch);
      client._setResponse('GET:/api/v1/namespaces/new-ns', 404, {});
      client._setResponse('POST:/api/v1/namespaces', 201, {});
      await expect(orch.ensureNamespace('new-ns')).resolves.toBeUndefined();
    });

    it('handles conflict (namespace already created by another process)', async () => {
      const client = getClient(orch);
      client._setResponse('GET:/api/v1/namespaces/new-ns', 404, {});
      client._setResponse('POST:/api/v1/namespaces', 409, { message: 'already exists' });
      await expect(orch.ensureNamespace('new-ns')).resolves.toBeUndefined();
    });
  });

  describe('getNamespace', () => {
    it('returns configured namespace', () => {
      expect(orch.getNamespace()).toBe('test-ns');
    });

    it('defaults to "default"', () => {
      const defaultOrch = new KubernetesOrchestrator({
        apiServer: 'https://localhost:6443',
      });
      expect(defaultOrch.getNamespace()).toBe('default');
    });
  });
});