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

import { createFleetApiDataSource } from './fleet-api-data-source.js';

describe('Fleet API data source', () => {
  it('loads instances and their allowlisted resource summaries', async () => {
    const fetcher = vi.fn(
      async (input: RequestInfo | URL) =>
        new Response(
          JSON.stringify(
            String(input).endsWith('/resources')
              ? {
                  cpuPercent: 23.4,
                  memoryPercent: 67.8,
                  maxTemperatureCelsius: 52.6,
                  phoneNumbers: ['13800000000'],
                }
              : {
                  items: [
                    {
                      id: 'alpha',
                      name: 'Alpha',
                      origin: 'https://alpha.example/admin',
                      tags: ['lab'],
                      revision: 4,
                      capabilityStatus: 'unknown',
                      freshness: 'unknown',
                      credentialConfigured: false,
                    },
                  ],
                  page: { page: 1, pageSize: 20, total: 1 },
                },
          ),
          { status: 200, headers: { 'content-type': 'application/json' } },
        ),
    );
    const snapshot = await createFleetApiDataSource(fetcher as typeof fetch).load();
    expect(snapshot.instances).toEqual([
      { id: 'alpha', name: 'Alpha', url: 'https://alpha.example/admin', tags: ['lab'], revision: 4 },
    ]);
    expect(snapshot.statuses.get('alpha')?.summary?.resources).toEqual({
      cpuPercent: 23.4,
      memoryPercent: 67.8,
      maxTemperatureCelsius: 52.6,
      phoneNumbers: ['13800000000'],
    });
    expect(fetcher).toHaveBeenCalledWith(
      '/api/v1/instances',
      expect.objectContaining({ credentials: 'same-origin' }),
    );
    expect(fetcher).toHaveBeenCalledWith(
      '/api/v1/instances/alpha/resources',
      expect.objectContaining({ credentials: 'same-origin' }),
    );
  });

  it('emits a partial fleet snapshot before resource enrichment completes', async () => {
    let resolveResources!: (value: Response) => void;
    const resourcesPromise = new Promise<Response>((resolve) => {
      resolveResources = resolve;
    });
    const fetcher = vi.fn(async (input: RequestInfo | URL) => {
      if (String(input).endsWith('/resources')) return resourcesPromise;
      return new Response(
        JSON.stringify({
          items: [
            {
              id: 'alpha',
              name: 'Alpha',
              origin: 'https://alpha.example/admin',
              tags: [],
              revision: 1,
              capabilityStatus: 'unknown',
              freshness: 'unknown',
              credentialConfigured: false,
            },
          ],
          page: { page: 1, pageSize: 20, total: 1 },
        }),
        { status: 200, headers: { 'content-type': 'application/json' } },
      );
    });
    const partials: unknown[] = [];
    const pending = createFleetApiDataSource(fetcher as typeof fetch).load(undefined, (snapshot) => {
      partials.push({
        resources: snapshot.statuses.get('alpha')?.summary?.resources,
        freshness: snapshot.statuses.get('alpha')?.summary?.freshness,
      });
    });
    await vi.waitFor(() => expect(partials.length).toBe(1));
    expect(partials[0]).toEqual({ resources: undefined, freshness: 'unknown' });
    resolveResources(
      new Response(JSON.stringify({ cpuPercent: 11, memoryPercent: 22 }), {
        status: 200,
        headers: { 'content-type': 'application/json' },
      }),
    );
    await pending;
    expect(partials.at(-1)).toEqual({
      resources: { cpuPercent: 11, memoryPercent: 22 },
      freshness: 'fresh',
    });
  });

  it('rejects legacy or malformed envelopes instead of rendering a false empty fleet', async () => {
    const fetcher = vi.fn(async () => new Response(JSON.stringify({ data: [] }), { status: 200 }));
    await expect(createFleetApiDataSource(fetcher as typeof fetch).load()).rejects.toThrow(
      'Fleet response is invalid.',
    );
  });
});