<?php

declare(strict_types=1);

namespace App\Support\Release;

final class FeatureFlagRegistry
{
    /**
     * Return the raw modular release feature flag config.
     *
     * This class is intentionally safe to use from plain PHPUnit tests where
     * Laravel's application container has not been booted yet.
     *
     * @return array<string, array<string, mixed>>
     */
    public static function all(): array
    {
        $config = self::loadConfig();

        return $config['feature_flags'] ?? $config['flags'] ?? [];
    }

    /**
     * Export a normalized list of flags for release checks and generated docs.
     *
     * @return array<int, array<string, mixed>>
     */
    public function export(): array
    {
        $flags = [];

        foreach (self::all() as $key => $definition) {
            $flags[] = [
                'key' => (string) $key,
                'owner' => (string) ($definition['owner'] ?? ''),
                'default' => (bool) ($definition['default'] ?? false),
                'removal_target' => $definition['removal_target'] ?? null,
                'dimensions' => $definition['dimensions'] ?? [],
            ];
        }

        return $flags;
    }

    /**
     * @return array<int, array<string, mixed>>
     */
    public static function highRisk(): array
    {
        return array_values(array_filter(
            (new self())->export(),
            fn (array $flag): bool => ($flag['risk'] ?? null) === 'high'
        ));
    }

    /**
     * @return array<string, mixed>
     */
    private static function loadConfig(): array
    {
        if (class_exists(\Illuminate\Foundation\Application::class)
            && class_exists(\Illuminate\Container\Container::class)
        ) {
            $container = \Illuminate\Container\Container::getInstance();

            if ($container instanceof \Illuminate\Foundation\Application && $container->bound('config')) {
                return ['flags' => $container['config']->get('modular_release.flags', [])];
            }
        }

        $path = dirname(__DIR__, 3).'/config/modular_release.php';

        if (! is_file($path)) {
            return [];
        }

        $contents = file_get_contents($path);

        if ($contents === false) {
            return [];
        }

        if (! preg_match("/'flags'\s*=>\s*\[(.*?)\n\s*\],\s*\n\s*'rollout_tracks'/s", $contents, $matches)) {
            return [];
        }

        /** @var array<string, array<string, mixed>> $flags */
        $flags = eval('return ['.$matches[1].'];');

        return ['flags' => is_array($flags) ? $flags : []];
    }
}