import { beforeEach, describe, expect, it, vi } from "vitest";

const {
    TRIGGER_WORDS_MODULE,
    I18N_HELPERS_MODULE,
    UI_HELPERS_MODULE,
    MODEL_API_MODULE,
    saveModelMetadataMock,
} = vi.hoisted(() => ({
    TRIGGER_WORDS_MODULE: new URL('../../../static/js/components/shared/TriggerWords.js', import.meta.url).pathname,
    I18N_HELPERS_MODULE: new URL('../../../static/js/utils/i18nHelpers.js', import.meta.url).pathname,
    UI_HELPERS_MODULE: new URL('../../../static/js/utils/uiHelpers.js', import.meta.url).pathname,
    MODEL_API_MODULE: new URL('../../../static/js/api/modelApiFactory.js', import.meta.url).pathname,
    saveModelMetadataMock: vi.fn(),
}));

vi.mock(I18N_HELPERS_MODULE, () => ({
    translate: vi.fn((key, params, fallback) => fallback || key),
}));

vi.mock(UI_HELPERS_MODULE, () => ({
    showToast: vi.fn(),
    copyToClipboard: vi.fn(),
}));

vi.mock(MODEL_API_MODULE, () => ({
    getModelApiClient: vi.fn(() => ({
        saveModelMetadata: saveModelMetadataMock,
    })),
}));

describe("TriggerWords reordering", () => {
    let renderTriggerWords;
    let setupTriggerWordsEditMode;

    beforeEach(async () => {
        document.body.innerHTML = '';
        vi.clearAllMocks();
        saveModelMetadataMock.mockResolvedValue({});
        global.fetch = vi.fn(async () => ({
            json: async () => ({
                success: true,
                trained_words: [],
                class_tokens: null,
            }),
        }));

        const module = await import(TRIGGER_WORDS_MODULE);
        renderTriggerWords = module.renderTriggerWords;
        setupTriggerWordsEditMode = module.setupTriggerWordsEditMode;
    });

    function section() {
        return document.querySelector('.trigger-words');
    }

    function order() {
        return Array.from(document.querySelectorAll('.trigger-word-tag'))
            .map((tag) => tag.dataset.word);
    }

    function handles() {
        return Array.from(document.querySelectorAll('.reorder-handle'));
    }

    function firePointer(type, target, init = {}) {
        target.dispatchEvent(new PointerEvent(type, {
            bubbles: true,
            cancelable: true,
            ...init,
        }));
    }

    function dragToEnd(handle) {
        firePointer('pointerdown', handle);
        firePointer('pointermove', handle, { clientY: 999 });
        firePointer('pointerup', handle, { clientY: 999 });
    }

    function pressKey(handle, key, init = {}) {
        const event = new KeyboardEvent('keydown', {
            key,
            bubbles: true,
            cancelable: true,
            ...init,
        });
        handle.dispatchEvent(event);
        return event;
    }

    async function enterEditMode(words = ["alpha", "beta", "gamma"]) {
        document.body.innerHTML = renderTriggerWords(words, "test.safetensors");
        setupTriggerWordsEditMode();

        document.querySelector('.edit-trigger-words-btn')
            .dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));

        await vi.waitFor(() => {
            expect(document.querySelector('.metadata-suggestions-dropdown')).toBeTruthy();
        });
    }

    it("renders a handle per word but only offers reordering for 2+ words", async () => {
        await enterEditMode(["alpha", "beta"]);

        expect(handles()).toHaveLength(2);
        expect(section().classList.contains('has-sortable-words')).toBe(true);
    });

    it("does not offer reordering when there is a single word", async () => {
        await enterEditMode(["alpha"]);

        expect(handles()).toHaveLength(1);
        expect(section().classList.contains('has-sortable-words')).toBe(false);
    });

    it("reorders a word by dragging its handle and swallows the follow-up click", async () => {
        await enterEditMode();

        dragToEnd(handles()[0]);

        expect(order()).toEqual(["beta", "gamma", "alpha"]);

        // The click generated by the drag must not open the inline editor
        const movedTag = document.querySelector('.trigger-word-tag[data-word="alpha"]');
        const clickEvent = new MouseEvent('click', { bubbles: true, cancelable: true });
        movedTag.dispatchEvent(clickEvent);

        expect(clickEvent.defaultPrevented).toBe(true);
        expect(movedTag.querySelector('.trigger-word-edit-input')).toBeNull();
    });

    it("does not start a drag from the tag body", async () => {
        await enterEditMode();

        const content = document.querySelector('.trigger-word-content');
        firePointer('pointerdown', content);
        expect(document.body.classList.contains('reorder-drag-active')).toBe(false);

        firePointer('pointermove', content, { clientY: 999 });
        firePointer('pointerup', content, { clientY: 999 });

        expect(order()).toEqual(["alpha", "beta", "gamma"]);
        expect(document.querySelector('.reorder-dragging')).toBeNull();
    });

    it("reorders with the keyboard and saves the new order", async () => {
        await enterEditMode();

        pressKey(handles()[0], 'ArrowRight', { altKey: true });
        expect(order()).toEqual(["beta", "alpha", "gamma"]);

        pressKey(handles()[2], 'ArrowUp', { altKey: true });
        expect(order()).toEqual(["beta", "gamma", "alpha"]);

        document.querySelector('.metadata-save-btn')
            .dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));

        await vi.waitFor(() => {
            expect(saveModelMetadataMock).toHaveBeenCalled();
        });

        expect(saveModelMetadataMock).toHaveBeenCalledWith("test.safetensors", {
            civitai: { trainedWords: ["beta", "gamma", "alpha"] },
        });
    });

    it("swallows the reorder shortcut at the ends of the list", async () => {
        await enterEditMode();

        const event = pressKey(handles()[0], 'ArrowLeft', { altKey: true });

        expect(event.defaultPrevented).toBe(true);
        expect(order()).toEqual(["alpha", "beta", "gamma"]);
    });

    it("ignores the reorder shortcut without the Alt modifier", async () => {
        await enterEditMode();

        pressKey(handles()[0], 'ArrowRight');

        expect(order()).toEqual(["alpha", "beta", "gamma"]);
    });

    it("announces moved words for screen readers", async () => {
        await enterEditMode();

        pressKey(handles()[0], 'ArrowRight', { altKey: true });

        const liveRegion = section().querySelector('.reorder-live-region');
        expect(liveRegion.getAttribute('aria-live')).toBe('polite');
        expect(liveRegion.textContent).toBe(
            'Moved to position 2 of 3',
        );
    });

    it("updates handle labels with the current position", async () => {
        await enterEditMode();

        expect(handles()[0].getAttribute('aria-label'))
            .toBe('Reorder alpha, position 1 of 3');

        pressKey(handles()[0], 'ArrowRight', { altKey: true });

        expect(handles()[0].getAttribute('aria-label'))
            .toBe('Reorder beta, position 1 of 3');
        expect(handles()[1].getAttribute('aria-label'))
            .toBe('Reorder alpha, position 2 of 3');
    });

    it("restores the original order when edit mode is canceled", async () => {
        await enterEditMode();

        dragToEnd(handles()[0]);
        expect(order()).toEqual(["beta", "gamma", "alpha"]);

        document.querySelector('.edit-trigger-words-btn')
            .dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));

        expect(order()).toEqual(["alpha", "beta", "gamma"]);
    });

    it("wires reordering for words added while editing", async () => {
        await enterEditMode(["alpha", "beta"]);

        const input = document.querySelector('.metadata-input');
        input.value = 'gamma';
        input.dispatchEvent(new KeyboardEvent('keydown', {
            key: 'Enter',
            bubbles: true,
            cancelable: true,
        }));

        expect(order()).toEqual(["alpha", "beta", "gamma"]);
        expect(handles()).toHaveLength(3);
        expect(section().classList.contains('has-sortable-words')).toBe(true);

        // The freshly added word is draggable too
        const newHandle = document.querySelector(
            '.trigger-word-tag[data-word="gamma"] .reorder-handle',
        );
        firePointer('pointerdown', newHandle);
        firePointer('pointermove', newHandle, { clientY: -999 });
        firePointer('pointerup', newHandle, { clientY: -999 });

        expect(order()).toEqual(["gamma", "alpha", "beta"]);
    });

    it("stops handling drags once edit mode is left", async () => {
        await enterEditMode();

        document.querySelector('.edit-trigger-words-btn')
            .dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));

        dragToEnd(handles()[0]);

        expect(order()).toEqual(["alpha", "beta", "gamma"]);
        expect(document.body.classList.contains('reorder-drag-active')).toBe(false);
        // The grip must not be offered anymore outside edit mode
        expect(section().classList.contains('has-sortable-words')).toBe(false);
        expect(
            document.querySelector('.trigger-words-tags').classList.contains('pointer-sort-enabled'),
        ).toBe(false);
    });
});