<?php

use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Process;
use Illuminate\Support\Str;
use NoNameWeb\LivewireMaterial\Support\Stylesheets;
use NoNameWeb\LivewireMaterial\Tests\Support\ComponentStylesheet;

/**
 * The stylesheets the package serves on its own — the showcase's and the error page's, outside an
 * application's Vite build — are prebuilt into resources/dist/ by `npm run build:stylesheets`
 * (bin/stylesheets.mjs), with Vite's own postcss-import: every `@import` inlined once, first
 * occurrence kept. This file pins that the committed files are current, the Vite deduplication they
 * rely on, and `Stylesheets::resolvedFiles()`, the import graph `DesignGuard` reads.
 *
 * This lives apart from StylesheetsTest.php, which is about the *shape* of the source tree (every
 * file's own header, layer statement and imports). `stylesheetsBundlePath()` is named apart from
 * StylesheetsTest.php's `stylesheetPath()` for the same reason: the two files may run in the same
 * Pest process, and a duplicate top-level function name is a fatal error.
 */
function stylesheetsBundlePath(string $path = ''): string
{
    return (string) realpath(ComponentStylesheet::cssPath($path));
}

it('resolves the files an entry imports, transitively, without bundling any content', function () {
    $files = Stylesheets::resolvedFiles([stylesheetsBundlePath('components/split-button.css')]);

    expect($files)->toContain(
        stylesheetsBundlePath('components/split-button.css'),
        stylesheetsBundlePath('components/button.css'),
        stylesheetsBundlePath('components/menu.css'),
        stylesheetsBundlePath('components/icon.css'),
    );
});

it('resolves past what an application entry imports and only a Vite build resolves, without throwing', function () {
    $dir = sys_get_temp_dir().'/livewire-material-resolved-'.Str::random(8);
    File::makeDirectory($dir);
    File::put($dir.'/theme.css', '.theme {}');
    File::put($dir.'/app.css', implode("\n", [
        "@import 'tailwindcss';",
        "@import url('https://fonts.googleapis.com/css2?family=Roboto');",
        "@import './theme.css' layer(app);",
        "@import './missing.css';",
        "@import '".stylesheetsBundlePath('components/icon.css')."';",
    ]));

    try {
        $files = Stylesheets::resolvedFiles([$dir.'/app.css']);
    } finally {
        File::deleteDirectory($dir);
    }

    expect($files)->toBe([realpath(sys_get_temp_dir()).'/'.basename($dir).'/app.css', realpath(sys_get_temp_dir()).'/'.basename($dir).'/theme.css']);
});

/**
 * Deduplication keeps a file at its first position, so an override that ties a rule it imports on
 * specificity (the navigation rail's header FAB over fab.css was one) still wins only while every
 * stylesheet's rules land after those of each file it imports. A depth-first inline guarantees
 * that for every import edge — except around a cycle, where one file of the two must come first.
 * So no package stylesheet may reach itself through its imports.
 */
it('keeps the package\'s import graph free of cycles, so a stylesheet always lands after what it imports', function () {
    $edges = 0;

    $walk = function (string $file, array $stack) use (&$walk, &$edges): void {
        expect(in_array($file, $stack, true))->toBeFalse('import cycle: '.implode(' → ', array_map(basename(...), [...$stack, $file])));

        preg_match_all("/@import\\s+'([^']+)'/", ComponentStylesheet::withoutComments(File::get($file)), $matches);

        foreach ($matches[1] as $import) {
            $edges++;
            $walk((string) realpath(dirname($file).'/'.$import), [...$stack, $file]);
        }
    };

    $walk(stylesheetsBundlePath('all.css'), []);

    expect($edges)->toBeGreaterThan(100);
});

/**
 * resources/dist/ is committed so applications need no Node; a stylesheet change without
 * `npm run build:stylesheets` would leave the showcase and the error pages serving the old rules.
 */
it('keeps the prebuilt stylesheets in resources/dist/ in step with resources/css/', function () {
    $node = config('livewire-material.node', 'node');

    if (Process::run([$node, '--version'])->failed() || ! is_dir(__DIR__.'/../../node_modules/vite')) {
        $this->markTestSkipped("Node ({$node}) or Vite is missing; `npm run build:stylesheets` builds resources/dist/.");
    }

    $outDir = sys_get_temp_dir().'/livewire-material-dist-'.Str::random(8);

    try {
        $result = Process::run([$node, __DIR__.'/../../bin/stylesheets.mjs', $outDir]);

        expect($result->successful())->toBeTrue($result->errorOutput());

        foreach (File::files($outDir) as $built) {
            $committed = __DIR__.'/../../resources/dist/'.$built->getFilename();

            expect(is_file($committed) ? File::get($committed) : null)
                ->toBe($built->getContents(), "resources/dist/{$built->getFilename()} is stale: run `npm run build:stylesheets`");
        }
    } finally {
        File::deleteDirectory($outDir);
    }
});

/**
 * Every innermost rule of a minified stylesheet — `selector{declarations}` with no block inside —
 * keyed by the at-rules around it (`@layer material.components{@media (hover:hover){…`), so the
 * same rule written for two different conditions counts as two rules, not one repeated.
 *
 * @return list<string>
 */
function stylesheetsBundleLeafRules(string $css): array
{
    $leaves = [];
    $stack = [];
    $start = 0;
    $length = strlen($css);

    for ($i = 0; $i < $length; $i++) {
        $char = $css[$i];

        if ($char === '"' || $char === "'") {
            $close = strpos($css, $char, $i + 1);

            if ($close === false) {
                break;
            }

            $i = $close;
        } elseif ($char === '{') {
            $stack[] = ['prelude' => trim(substr($css, $start, $i - $start)), 'open' => $i, 'leaf' => true];

            if (count($stack) > 1) {
                $stack[count($stack) - 2]['leaf'] = false;
            }

            $start = $i + 1;
        } elseif ($char === '}') {
            $block = array_pop($stack);

            if ($block !== null && $block['leaf']) {
                $context = implode('{', array_column($stack, 'prelude'));
                $leaves[] = $context.'{'.$block['prelude'].'{'.substr($css, $block['open'] + 1, $i - $block['open'] - 1).'}';
            }

            $start = $i + 1;
        } elseif ($char === ';' && ($stack === [] || ! $stack[count($stack) - 1]['leaf'])) {
            // A statement between blocks (`@layer a,b;`) is not part of the next rule's selector.
            $start = $i + 1;
        }
    }

    return $leaves;
}

/**
 * The Vite deduplication the prebuilt stylesheets and every application's build rely on, pinned
 * against the real bundler (tests/Fixtures/dedup.vite.config.mjs, no plugin in the graph):
 * `all.css`, and tests/Fixtures/dedup-app.css, an entry shaped like an application's — outside
 * the package, the foundation, then split button, app bar, modal and pagination, which each
 * import button.css, and button.css once more.
 *
 * The built CSS is minified, so this compares rules rather than files: no innermost rule may
 * appear twice under the same at-rules. A build that inlined every occurrence of a shared
 * stylesheet repeats hundreds of them (the Workbench's entry did while it shared one file with
 * `@tailwindcss/vite`: button.css's hover and disabled rules thirteen times), while a file's plain
 * root rule alone is no evidence — the minifier folds identical copies of that one together. In
 * the application entry, button.css must also keep its first position: before split-button.css,
 * the first file that imports it, not at the end where the application named it again.
 */
it('lands every rule once, at its first position, in a real Vite build of all.css and of an application entry', function () {
    $node = config('livewire-material.node', 'node');

    if (Process::run([$node, '--version'])->failed()) {
        $this->markTestSkipped("Node ({$node}) could not run.");
    }

    $vite = __DIR__.'/../../node_modules/vite/bin/vite.js';

    if (! is_file($vite)) {
        $this->markTestSkipped('Vite is not installed (node_modules/vite is missing).');
    }

    $outDir = sys_get_temp_dir().'/livewire-material-dedup-'.Str::random(8);

    try {
        $result = Process::path(__DIR__.'/../..')
            ->env(['DEDUP_OUT_DIR' => $outDir])
            ->timeout(120)
            ->run([$node, $vite, 'build', '--config', 'tests/Fixtures/dedup.vite.config.mjs']);

        expect($result->successful())->toBeTrue($result->errorOutput());

        $manifest = json_decode(File::get("{$outDir}/.vite/manifest.json"), true, flags: JSON_THROW_ON_ERROR);

        foreach (['resources/css/all.css', 'tests/Fixtures/dedup-app.css'] as $entry) {
            $css = File::get($outDir.'/'.$manifest[$entry]['file']);
            $leaves = stylesheetsBundleLeafRules($css);
            $repeated = array_keys(array_filter(array_count_values($leaves), fn (int $count): bool => $count > 1));

            expect(count($leaves))->toBeGreaterThan(100, $entry)
                ->and($repeated)->toBe([], "{$entry} repeats a rule, so a shared stylesheet landed more than once");
        }

        $app = File::get($outDir.'/'.$manifest['tests/Fixtures/dedup-app.css']['file']);

        expect(strpos($app, '[data-md-button]{'))->toBeInt()
            ->toBeLessThan((int) strpos($app, '[data-md-split-button]{'))
            ->and(strpos($app, '[data-md-app-bar]'))->toBeGreaterThan((int) strpos($app, '[data-md-split-button]{'));
    } finally {
        File::deleteDirectory($outDir);
    }
});