/**
 * Tests for proxy API client
 */

import {
    beforeEach,
    describe,
    expect,
    test,
    vi,
} from 'vitest';
import type { UnifiedFont } from '../../model/types';
import type { ProxyFontsResponse } from './proxyFonts';

vi.mock('$shared/api/api', () => ({
    api: {
        get: vi.fn(),
    },
}));

import { api } from '$shared/api/api';
import {
    fetchFontsByIds,
    fetchProxyFontById,
    fetchProxyFonts,
} from './proxyFonts';

const PROXY_API_URL = 'https://api.glyphdiff.com/api/v1/fonts';

function createMockFont(overrides: Partial<UnifiedFont> = {}): UnifiedFont {
    return {
        id: 'roboto',
        family: 'Roboto',
        provider: 'google',
        category: 'sans-serif',
        variants: [],
        subsets: [],
        ...overrides,
    } as UnifiedFont;
}

function mockApiGet<T>(data: T) {
    vi.mocked(api.get).mockResolvedValueOnce({ data, status: 200 });
}

describe('proxyFonts', () => {
    beforeEach(() => {
        vi.mocked(api.get).mockReset();
    });

    describe('fetchProxyFonts', () => {
        test('should fetch fonts with no params', async () => {
            const mockResponse: ProxyFontsResponse = {
                fonts: [createMockFont()],
                total: 1,
                limit: 50,
                offset: 0,
            };
            mockApiGet(mockResponse);

            const result = await fetchProxyFonts();

            expect(api.get).toHaveBeenCalledWith(PROXY_API_URL);
            expect(result).toEqual(mockResponse);
        });

        test('should build URL with query params', async () => {
            const mockResponse: ProxyFontsResponse = {
                fonts: [createMockFont()],
                total: 1,
                limit: 20,
                offset: 0,
            };
            mockApiGet(mockResponse);

            await fetchProxyFonts({ provider: 'google', category: 'sans-serif', limit: 20, offset: 0 });

            const calledUrl = vi.mocked(api.get).mock.calls[0][0];
            expect(calledUrl).toContain('provider=google');
            expect(calledUrl).toContain('category=sans-serif');
            expect(calledUrl).toContain('limit=20');
            expect(calledUrl).toContain('offset=0');
        });

        test('should throw on invalid response (missing fonts array)', async () => {
            mockApiGet({ total: 0 });

            await expect(fetchProxyFonts()).rejects.toThrow('Proxy API returned invalid response');
        });

        test('should throw on null response data', async () => {
            vi.mocked(api.get).mockResolvedValueOnce({ data: null, status: 200 });

            await expect(fetchProxyFonts()).rejects.toThrow('Proxy API returned invalid response');
        });
    });

    describe('fetchProxyFontById', () => {
        test('should return font matching the ID', async () => {
            const targetFont = createMockFont({ id: 'satoshi', name: 'Satoshi' });
            const mockResponse: ProxyFontsResponse = {
                fonts: [createMockFont(), targetFont],
                total: 2,
                limit: 1000,
                offset: 0,
            };
            mockApiGet(mockResponse);

            const result = await fetchProxyFontById('satoshi');

            expect(result).toEqual(targetFont);
        });

        test('should return undefined when font not found', async () => {
            const mockResponse: ProxyFontsResponse = {
                fonts: [createMockFont()],
                total: 1,
                limit: 1000,
                offset: 0,
            };
            mockApiGet(mockResponse);

            const result = await fetchProxyFontById('nonexistent');

            expect(result).toBeUndefined();
        });

        test('should search with the ID as query param', async () => {
            const mockResponse: ProxyFontsResponse = {
                fonts: [],
                total: 0,
                limit: 1000,
                offset: 0,
            };
            mockApiGet(mockResponse);

            await fetchProxyFontById('Roboto');

            const calledUrl = vi.mocked(api.get).mock.calls[0][0];
            expect(calledUrl).toContain('limit=1000');
            expect(calledUrl).toContain('q=Roboto');
        });
    });

    describe('fetchFontsByIds', () => {
        test('should return empty array for empty input', async () => {
            const result = await fetchFontsByIds([]);

            expect(result).toEqual([]);
            expect(api.get).not.toHaveBeenCalled();
        });

        test('should call batch endpoint with comma-separated IDs', async () => {
            const fonts = [createMockFont({ id: 'roboto' }), createMockFont({ id: 'satoshi' })];
            mockApiGet(fonts);

            const result = await fetchFontsByIds(['roboto', 'satoshi']);

            expect(api.get).toHaveBeenCalledWith(`${PROXY_API_URL}/batch?ids=roboto,satoshi`);
            expect(result).toEqual(fonts);
        });

        test('should return empty array when response data is nullish', async () => {
            vi.mocked(api.get).mockResolvedValueOnce({ data: null, status: 200 });

            const result = await fetchFontsByIds(['roboto']);

            expect(result).toEqual([]);
        });
    });
});