import { queryClient } from '$shared/api/queryClient';
import { fontKeys } from '$shared/api/queryKeys';
import {
    beforeEach,
    describe,
    expect,
    it,
    vi,
} from 'vitest';
import * as api from '../../api/proxy/proxyFonts';
import {
    FontNetworkError,
    FontResponseError,
} from '../../lib/errors/errors';
import { BatchFontStore } from './batchFontStore.svelte';

describe('BatchFontStore', () => {
    beforeEach(() => {
        queryClient.clear();
        vi.clearAllMocks();
    });

    describe('Fetch Behavior', () => {
        it('should skip fetch when initialized with empty IDs', async () => {
            const spy = vi.spyOn(api, 'fetchFontsByIds');
            const store = new BatchFontStore([]);
            expect(spy).not.toHaveBeenCalled();
            expect(store.fonts).toEqual([]);
        });

        it('should fetch and seed cache for valid IDs', async () => {
            const fonts = [{ id: 'a', name: 'A' }] as any[];
            vi.spyOn(api, 'fetchFontsByIds').mockResolvedValue(fonts);
            const store = new BatchFontStore(['a']);
            await vi.waitFor(() => expect(store.fonts).toEqual(fonts), { timeout: 1000 });
            expect(queryClient.getQueryData(fontKeys.detail('a'))).toEqual(fonts[0]);
        });
    });

    describe('Loading States', () => {
        it('should transition through loading state', async () => {
            vi.spyOn(api, 'fetchFontsByIds').mockImplementation(() =>
                new Promise(r => setTimeout(() => r([{ id: 'a' }] as any), 50))
            );
            const store = new BatchFontStore(['a']);
            expect(store.isLoading).toBe(true);
            await vi.waitFor(() => expect(store.isLoading).toBe(false), { timeout: 1000 });
        });
    });

    describe('Error Handling', () => {
        it('should wrap network failures in FontNetworkError', async () => {
            vi.spyOn(api, 'fetchFontsByIds').mockRejectedValue(new Error('Network fail'));
            const store = new BatchFontStore(['a']);
            await vi.waitFor(() => expect(store.isError).toBe(true), { timeout: 1000 });
            expect(store.error).toBeInstanceOf(FontNetworkError);
        });

        it('should handle malformed API responses with FontResponseError', async () => {
            // Mocking a malformed response that the store should validate
            vi.spyOn(api, 'fetchFontsByIds').mockResolvedValue(null as any);
            const store = new BatchFontStore(['a']);
            await vi.waitFor(() => expect(store.isError).toBe(true), { timeout: 1000 });
            expect(store.error).toBeInstanceOf(FontResponseError);
        });

        it('should have null error in success state', async () => {
            const fonts = [{ id: 'a' }] as any[];
            vi.spyOn(api, 'fetchFontsByIds').mockResolvedValue(fonts);
            const store = new BatchFontStore(['a']);
            await vi.waitFor(() => expect(store.fonts).toEqual(fonts), { timeout: 1000 });
            expect(store.error).toBeNull();
        });
    });

    describe('Disable Behavior', () => {
        it('should return empty fonts and not fetch when setIds is called with empty array', async () => {
            const fonts1 = [{ id: 'a' }] as any[];
            const spy = vi.spyOn(api, 'fetchFontsByIds').mockResolvedValueOnce(fonts1);

            const store = new BatchFontStore(['a']);
            await vi.waitFor(() => expect(store.fonts).toEqual(fonts1), { timeout: 1000 });

            spy.mockClear();
            store.setIds([]);

            await vi.waitFor(() => expect(store.fonts).toEqual([]), { timeout: 1000 });
            expect(spy).not.toHaveBeenCalled();
        });
    });

    describe('Reactivity', () => {
        it('should refetch when setIds is called', async () => {
            const fonts1 = [{ id: 'a' }] as any[];
            const fonts2 = [{ id: 'b' }] as any[];
            vi.spyOn(api, 'fetchFontsByIds')
                .mockResolvedValueOnce(fonts1)
                .mockResolvedValueOnce(fonts2);

            const store = new BatchFontStore(['a']);
            await vi.waitFor(() => expect(store.fonts).toEqual(fonts1), { timeout: 1000 });

            store.setIds(['b']);
            await vi.waitFor(() => expect(store.fonts).toEqual(fonts2), { timeout: 1000 });
        });
    });
});