// @vitest-environment jsdom

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

import { createActiveDom } from '$adom';
import { state } from '$libs/reactive';
import type { Morfo } from '$uix/morfo';
import { Soma } from '$soma/core/soma.svelte';
import { createSomaRuntime, type SomaRuntimeSources } from '$soma/runtime.svelte';

import { TimelineItemProvider, TimelineProvider } from './timeline-provider.svelte';

function withEffectRoot<T>(fn: () => T): { result: T; cleanup: () => void } {
	let result!: T;
	const cleanup = $effect.root(() => {
		result = fn();
	});
	return { result, cleanup };
}

function installSomaHarness() {
	const dom = createActiveDom();
	const soma = {
		dom,
		langs: {
			ts: vi.fn(() => 'Timeline')
		},
		runtime: (morfo: Morfo, sources: Omit<SomaRuntimeSources, 'dom' | 'eventEngine'>) =>
			createSomaRuntime(morfo, {
				dom,
				translate: (key) => key,
				...sources
			})
	} as unknown as Soma;

	vi.spyOn(Soma, 'require').mockReturnValue(soma);
	vi.spyOn(TimelineProvider.ctx, 'set').mockImplementation((value) => value);
	vi.spyOn(TimelineItemProvider.ctx, 'set').mockImplementation((value) => value);

	return { dom };
}

function timelineOpts(active: number | null, live = false, root = document.createElement('ol')) {
	return {
		id: state('timeline-root'),
		ref: state<HTMLElement | null>(root),
		active: state<number | null>(active),
		live: state(live),
		ariaLabel: state<string | undefined>(undefined)
	};
}

function itemOpts(index: number | undefined, opts?: { status?: 'done' | 'current' | 'upcoming' }) {
	return {
		id: state(`timeline-item-${index ?? 'auto'}`),
		ref: state<HTMLElement | null>(document.createElement('li')),
		index: state<number | undefined>(index),
		status: state<'done' | 'current' | 'upcoming' | undefined>(opts?.status),
		intent: state<'neutral' | 'affirm' | 'fulfill' | 'risk' | 'threat' | 'loss' | undefined>(undefined)
	};
}

describe('TimelineProvider', () => {
	afterEach(() => {
		vi.restoreAllMocks();
		document.body.innerHTML = '';
	});

	it('derives item status from the active index and projects runtime attrs', async () => {
		const { dom } = installSomaHarness();
		const root = document.createElement('ol');
		const firstEl = document.createElement('li');
		const currentEl = document.createElement('li');
		const lastEl = document.createElement('li');
		document.body.append(root, firstEl, currentEl, lastEl);

		const { result, cleanup } = withEffectRoot(() => {
			const provider = TimelineProvider.create(timelineOpts(1, false, root));
			vi.spyOn(TimelineProvider, 'require').mockReturnValue(provider);

			const first = TimelineItemProvider.create({ ...itemOpts(0), ref: state<HTMLElement | null>(firstEl) });
			const current = TimelineItemProvider.create({ ...itemOpts(1), ref: state<HTMLElement | null>(currentEl) });
			const last = TimelineItemProvider.create({ ...itemOpts(2), ref: state<HTMLElement | null>(lastEl) });
			return { provider, first, current, last };
		});

		expect(result.first.effectiveStatus).toBe('done');
		expect(result.current.effectiveStatus).toBe('current');
		expect(result.last.effectiveStatus).toBe('upcoming');
		expect(result.current.isCurrent).toBe(true);

		// renderProps resolves the morfo attrs into the props object the wrapper
		// spreads onto the element; assert the object (no wrapper in this harness).
		expect(result.provider.props).toMatchObject({
			id: 'timeline-root',
			'data-timeline': '',
			role: 'list',
			'aria-label': 'Timeline'
		});
		expect(result.first.props).toMatchObject({ 'data-timeline-item': '', 'data-status': 'done' });
		expect(result.current.props).toMatchObject({
			'data-status': 'current',
			'aria-current': 'step'
		});
		expect(result.last.props).toMatchObject({ 'data-status': 'upcoming' });
		expect(result.first.props['aria-current']).toBeUndefined();

		await tick();
		cleanup();
		dom.dispose();
	});

	it('lets an explicit status override the derived value and tints with intent', async () => {
		const { dom } = installSomaHarness();
		const root = document.createElement('ol');
		const el = document.createElement('li');
		document.body.append(root, el);

		const { result, cleanup } = withEffectRoot(() => {
			const provider = TimelineProvider.create(timelineOpts(2, false, root));
			vi.spyOn(TimelineProvider, 'require').mockReturnValue(provider);
			// index 0 would derive 'done', but the explicit status wins.
			const item = TimelineItemProvider.create({
				...itemOpts(0, { status: 'current' }),
				ref: state<HTMLElement | null>(el),
				intent: state<'neutral' | 'affirm' | 'fulfill' | 'risk' | 'threat' | 'loss' | undefined>('threat')
			});
			return { provider, item };
		});

		expect(result.item.effectiveStatus).toBe('current');
		expect(result.item.props).toMatchObject({
			'data-status': 'current',
			'data-intent': 'threat',
			'aria-current': 'step'
		});

		cleanup();
		dom.dispose();
	});

	it('auto-indexes items by registration order when no index is passed', () => {
		const { dom } = installSomaHarness();
		const root = document.createElement('ol');

		const { result, cleanup } = withEffectRoot(() => {
			const provider = TimelineProvider.create(timelineOpts(1, false, root));
			vi.spyOn(TimelineProvider, 'require').mockReturnValue(provider);
			const a = TimelineItemProvider.create(itemOpts(undefined));
			const b = TimelineItemProvider.create(itemOpts(undefined));
			const c = TimelineItemProvider.create(itemOpts(undefined));
			return { a, b, c };
		});

		expect([result.a.index, result.b.index, result.c.index]).toEqual([0, 1, 2]);
		expect(result.a.effectiveStatus).toBe('done');
		expect(result.b.effectiveStatus).toBe('current');
		expect(result.c.effectiveStatus).toBe('upcoming');

		cleanup();
		dom.dispose();
	});

	it('leaves status undefined when neither active nor explicit status is set', () => {
		const { dom } = installSomaHarness();
		const { result, cleanup } = withEffectRoot(() => {
			const provider = TimelineProvider.create(timelineOpts(null));
			vi.spyOn(TimelineProvider, 'require').mockReturnValue(provider);
			const item = TimelineItemProvider.create(itemOpts(0));
			return { item };
		});

		expect(result.item.effectiveStatus).toBeUndefined();

		cleanup();
		dom.dispose();
	});
});