// @vitest-environment node

import { describe, expect, it, vi } from 'vitest';
import {
  parsePluginCatalog,
  PluginPolicyClient,
} from '../../electron/services/plugin-policy-client';

const catalog = {
  schema_version: 1,
  catalog_version: 'catalog-1',
  pricing_version: null,
  plugins: [{
    plugin_id: 'makelore.data-service',
    supported_contract_versions: [1],
    status: 'active',
    capabilities: [
      {
        capability_id: 'data-service.documents',
        operations: [
          {
            operation: 'get_document',
            billing: {
              mode: 'included',
              entitlement_scope: null,
              notice: 'Included in development data service',
            },
          },
        ],
      },
    ],
  }],
};

describe('PluginPolicyClient', () => {
  it('parses the exact catalog and rejects unknown or malformed fields', () => {
    expect(parsePluginCatalog(catalog)).toMatchObject({
      schema_version: 1,
      catalog_version: 'catalog-1',
      plugins: [{ plugin_id: 'makelore.data-service' }],
    });
    expect(() => parsePluginCatalog({ ...catalog, extra: true })).toThrow('unexpected fields');
    expect(() => parsePluginCatalog({
      ...catalog,
      plugins: [{
        ...catalog.plugins[0],
        capabilities: [{
          ...catalog.plugins[0].capabilities[0],
          operations: [{
            ...catalog.plugins[0].capabilities[0].operations[0],
            billing: { mode: 'included', entitlement_scope: 'wrong', notice: 'nope' },
          }],
        }],
      }],
    })).toThrow();
  });

  it('accepts an unavailable platform-metered policy without exposing a price', () => {
    const parsed = parsePluginCatalog({
      ...catalog,
      plugins: [{
        ...catalog.plugins[0],
        capabilities: [{
          ...catalog.plugins[0].capabilities[0],
          operations: [{
            ...catalog.plugins[0].capabilities[0].operations[0],
            billing: {
              mode: 'platform_metered',
              status: 'billing_unavailable',
              entitlement_scope: 'data-service.documents',
              notice: 'Pricing is unavailable',
            },
          }],
        }],
      }],
    });
    expect(parsed.plugins[0]?.capabilities[0]?.operations[0]?.billing).toEqual({
      mode: 'platform_metered',
      status: 'billing_unavailable',
      entitlement_scope: 'data-service.documents',
      notice: 'Pricing is unavailable',
    });
  });

  it('coalesces concurrent refreshes and marks the verified catalog stale after failure', async () => {
    let resolveRequest: ((response: Response) => void) | undefined;
    const fetchImpl = vi.fn(() => new Promise<Response>((resolve) => {
      resolveRequest = resolve;
    }));
    const client = new PluginPolicyClient({
      fetchImpl,
      apiBaseUrl: 'https://works.example',
      now: () => 123,
    });
    const first = client.refresh();
    const second = client.refresh();
    expect(first).toBe(second);
    expect(fetchImpl).toHaveBeenCalledTimes(1);
    resolveRequest?.(new Response(JSON.stringify(catalog), {
      status: 200,
      headers: { 'content-type': 'application/json' },
    }));
    await expect(first).resolves.toMatchObject({ status: 'current', revision: 1 });

    fetchImpl.mockRejectedValueOnce(new Error('offline'));
    await expect(client.refresh()).resolves.toMatchObject({
      status: 'stale',
      revision: 1,
      errorCode: 'plugin_backend_unavailable',
    });
    expect(client.getState().catalog).toEqual(expect.objectContaining({ catalog_version: 'catalog-1' }));
  });

  it('keeps an unavailable first state when no catalog was verified', async () => {
    const client = new PluginPolicyClient({ fetchImpl: vi.fn().mockRejectedValue(new Error('offline')) });
    await expect(client.refresh()).resolves.toMatchObject({
      status: 'unavailable',
      catalog: null,
      revision: 0,
      errorCode: 'plugin_backend_unavailable',
    });
  });

  it.each(['headers', 'body'] as const)(
    'bounds a catalog request whose %s never settle',
    async (phase) => {
      const fetchImpl = vi.fn((_input: string | URL, init?: RequestInit) => {
        if (phase === 'headers') {
          return new Promise<Response>((_resolve, reject) => {
            init?.signal?.addEventListener('abort', () => reject(init.signal?.reason), { once: true });
          });
        }
        return Promise.resolve(new Response(new ReadableStream<Uint8Array>({
          start(controller) {
            init?.signal?.addEventListener('abort', () => controller.error(init.signal?.reason), { once: true });
          },
        }), { status: 200, headers: { 'content-type': 'application/json' } }));
      });
      const client = new PluginPolicyClient({ fetchImpl, requestTimeoutMs: 20 });

      await expect(client.refresh()).resolves.toMatchObject({
        status: 'unavailable', catalog: null, revision: 0,
        errorCode: 'plugin_backend_unavailable',
      });
      expect(fetchImpl).toHaveBeenCalledOnce();
    },
  );
});