import assert from 'node:assert/strict';
import { readFile } from 'node:fs/promises';
import { fileURLToPath } from 'node:url';
import vm from 'node:vm';
import vue from '@vitejs/plugin-vue';
import { createServer } from 'vite';
import { createSSRApp, h } from 'vue';
import { renderToString } from 'vue/server-renderer';

const server = await createServer({
    configFile: false,
    plugins: [vue()],
    resolve: {
        alias: {
            '@': fileURLToPath(new URL('../../resources/js', import.meta.url)),
        },
    },
    server: { middlewareMode: true, hmr: false, watch: null },
    appType: 'custom',
});

function browserState(cookie, stored, dark, storageDenied = false) {
    const root = { dataset: { appearance: cookie }, style: {}, dark: false };
    root.classList = {
        toggle: (_, value) => {
            root.dark = value;
        },
    };
    const listeners = new Map();
    const storage = new Map(stored === null ? [] : [['appearance', stored]]);
    const media = {
        matches: dark,
        addEventListener: (_, listener) => listeners.set('media', listener),
        removeEventListener: () => listeners.delete('media'),
    };
    return {
        document: { documentElement: root, cookie: '' },
        window: {
            matchMedia: () => media,
            localStorage: {
                getItem: (key) => {
                    if (storageDenied) {
                        throw new Error('Storage denied');
                    }
                    return storage.get(key) ?? null;
                },
                setItem: (key, value) => {
                    if (storageDenied) {
                        throw new Error('Storage denied');
                    }
                    storage.set(key, value);
                },
            },
            addEventListener: (_, listener) =>
                listeners.set('storage', listener),
            removeEventListener: () => listeners.delete('storage'),
        },
        root,
        media,
        listeners,
        storage,
    };
}

try {
    const { createAppearance, normalizeAppearance } =
        await server.ssrLoadModule(
            '/resources/js/composables/useAppearance.ts',
        );
    const { createLocalization } = await server.ssrLoadModule(
        '/resources/js/lib/localization.ts',
    );
    const { default: AppearanceTabs } = await server.ssrLoadModule(
        '/resources/js/components/AppearanceTabs.vue',
    );

    const renderTheme = (value) =>
        renderToString(
            createSSRApp({ render: () => h(AppearanceTabs) })
                .use(createLocalization())
                .use(createAppearance(value)),
        );
    const [light, dark] = await Promise.all([
        renderTheme('light'),
        renderTheme('dark'),
    ]);
    assert.match(light, /value="light"[^>]*checked/);
    assert.match(dark, /value="dark"[^>]*checked/);
    assert.match(light, /<legend class="sr-only">Color theme<\/legend>/);
    assert.equal((light.match(/type="radio"/g) ?? []).length, 3);
    assert.equal((dark.match(/ checked/g) ?? []).length, 1);
    assert.equal(normalizeAppearance('unexpected'), 'system');

    const blade = await readFile('resources/views/app.blade.php', 'utf8');
    const bootstrap = blade.match(/<script>([\s\S]*?)<\/script>/)[1];
    for (const [cookie, stored, osDark, denied, expected, preference] of [
        ['system', null, false, false, false, 'system'],
        ['system', null, true, false, true, 'system'],
        ['dark', null, false, false, true, 'dark'],
        ['light', null, true, false, false, 'light'],
        ['light', 'dark', false, false, true, 'dark'],
        ['dark', null, false, true, true, 'dark'],
        ['light', 'invalid', true, false, true, 'system'],
    ]) {
        const state = browserState(cookie, stored, osDark, denied);
        vm.runInNewContext(bootstrap, state);
        assert.equal(state.root.dark, expected);
        assert.equal(state.root.dataset.appearance, preference);
        assert.equal(state.root.style.colorScheme, expected ? 'dark' : 'light');
    }

    for (const denied of [false, true]) {
        const state = browserState('system', null, false, denied);
        globalThis.window = state.window;
        globalThis.document = state.document;
        const theme = createAppearance();
        let cleanup;
        theme.install({
            provide() {},
            onUnmount(callback) {
                cleanup = callback;
            },
        });
        assert.equal(theme.resolvedAppearance.value, 'light');
        state.listeners.get('media')({ matches: true });
        assert.equal(theme.resolvedAppearance.value, 'dark');
        assert.equal(state.root.dark, true);
        theme.updateAppearance('light');
        assert.equal(state.root.dark, false);
        assert.match(state.document.cookie, /appearance=light;.*SameSite=Lax/);
        state.listeners.get('media')({ matches: false });
        state.listeners.get('media')({ matches: true });
        assert.equal(theme.resolvedAppearance.value, 'light');
        theme.updateAppearance('system');
        assert.equal(theme.resolvedAppearance.value, 'dark');
        state.listeners.get('storage')({
            key: 'appearance',
            newValue: 'light',
        });
        assert.equal(theme.appearance.value, 'light');
        state.listeners.get('storage')({ key: null, newValue: null });
        assert.equal(theme.appearance.value, 'system');
        if (!denied) {
            assert.equal(state.storage.get('appearance'), 'system');
        }
        cleanup();
        assert.equal(state.listeners.size, 0);
        delete globalThis.window;
        delete globalThis.document;
    }

    const css = await readFile('resources/css/theme.css', 'utf8');
    function luminance(hex) {
        const values = hex
            .match(/[a-f\d]{2}/gi)
            .map((part) => parseInt(part, 16) / 255)
            .map((value) =>
                value <= 0.04045
                    ? value / 12.92
                    : ((value + 0.055) / 1.055) ** 2.4,
            );
        return values[0] * 0.2126 + values[1] * 0.7152 + values[2] * 0.0722;
    }
    function contrast(first, second) {
        const values = [luminance(first), luminance(second)].sort(
            (a, b) => b - a,
        );
        return (values[0] + 0.05) / (values[1] + 0.05);
    }
    for (const selector of [':root', '.dark']) {
        const declarations = css
            .slice(css.indexOf(selector))
            .match(/\{([^}]+)\}/)[1];
        const tokens = Object.fromEntries(
            [...declarations.matchAll(/--([\w-]+):\s*(#[a-f\d]{6})/gi)].map(
                (match) => [match[1], match[2]],
            ),
        );
        for (const [background, foreground] of [
            ['background', 'foreground'],
            ['card', 'card-foreground'],
            ['popover', 'popover-foreground'],
            ['primary', 'primary-foreground'],
            ['secondary', 'secondary-foreground'],
            ['muted', 'muted-foreground'],
            ['accent', 'accent-foreground'],
            ['destructive', 'destructive-foreground'],
            ['card', 'destructive'],
            ['brand', 'brand-foreground'],
            ['success', 'success-foreground'],
            ['warning', 'warning-foreground'],
            ['info', 'info-foreground'],
            ['sidebar-background', 'sidebar-foreground'],
            ['sidebar-accent', 'sidebar-accent-foreground'],
            ['sidebar-primary', 'sidebar-primary-foreground'],
        ]) {
            assert.ok(
                contrast(tokens[background], tokens[foreground]) >= 4.5,
                selector + ': ' + background + '/' + foreground,
            );
        }
        assert.ok(contrast(tokens.background, tokens.ring) >= 3);
        assert.ok(contrast(tokens.card, tokens.input) >= 3);
    }
    const appCss = await readFile('resources/css/app.css', 'utf8');
    assert.match(appCss, /@media \(prefers-reduced-motion: reduce\)/);
    assert.match(appCss, /animation-duration: 0.01ms !important/);
    assert.match(appCss, /transition-duration: 0.01ms !important/);
    assert.match(appCss, /scroll-behavior: auto !important/);
    console.log('Appearance behavior checks passed.');
} finally {
    delete globalThis.window;
    delete globalThis.document;
    await server.close();
}