<?php

declare(strict_types=1);

namespace Tests\Unit\Framework\FeatureFlags;

use App\Framework\FeatureFlags\FeatureFlag;
use App\Framework\FeatureFlags\FeatureFlagContext;
use App\Framework\FeatureFlags\FeatureFlagManager;
use App\Framework\FeatureFlags\FeatureFlagRepository;
use App\Framework\FeatureFlags\FeatureFlagStatus;
use App\Framework\Core\ValueObjects\Timestamp;

describe('FeatureFlagManager', function () {
    beforeEach(function () {
        // Create in-memory repository for testing
        $this->repository = new class implements FeatureFlagRepository {
            private array $flags = [];

            public function find(string $name): ?FeatureFlag
            {
                return $this->flags[$name] ?? null;
            }

            public function findAll(): array
            {
                return array_values($this->flags);
            }

            public function save(FeatureFlag $flag): void
            {
                $this->flags[$flag->name] = $flag;
            }

            public function delete(string $name): void
            {
                unset($this->flags[$name]);
            }

            public function exists(string $name): bool
            {
                return isset($this->flags[$name]);
            }
        };

        $this->manager = new FeatureFlagManager($this->repository);
    });

    it('enables a feature flag', function () {
        $this->manager->enable('test-feature', 'Test description');

        expect($this->manager->isEnabled('test-feature'))->toBeTrue();
        expect($this->manager->exists('test-feature'))->toBeTrue();
    });

    it('disables a feature flag', function () {
        $this->manager->enable('test-feature');
        $this->manager->disable('test-feature');

        expect($this->manager->isDisabled('test-feature'))->toBeTrue();
    });

    it('returns false for non-existent flag', function () {
        expect($this->manager->isEnabled('non-existent'))->toBeFalse();
    });

    it('sets conditional feature flag', function () {
        $this->manager->setConditional('user-feature', ['user_id' => [1, 2, 3]]);

        $matchingContext = (new FeatureFlagContext())->withUserId('2');
        $nonMatchingContext = (new FeatureFlagContext())->withUserId('99');

        expect($this->manager->isEnabled('user-feature', $matchingContext))->toBeTrue();
        expect($this->manager->isEnabled('user-feature', $nonMatchingContext))->toBeFalse();
    });

    it('sets percentage rollout', function () {
        $this->manager->setPercentageRollout('rollout-feature', 50);

        $flag = $this->manager->getFlag('rollout-feature');
        expect($flag)->not->toBeNull();
        expect($flag->conditions)->toHaveKey('percentage');
        expect($flag->conditions['percentage'])->toBe(50);
    });

    it('validates percentage range', function () {
        expect(fn () => $this->manager->setPercentageRollout('invalid', 150))
            ->toThrow(\InvalidArgumentException::class);

        expect(fn () => $this->manager->setPercentageRollout('invalid', -10))
            ->toThrow(\InvalidArgumentException::class);
    });

    it('sets user-specific flag', function () {
        $this->manager->setForUsers('user-only', [1, 2, 3]);

        $flag = $this->manager->getFlag('user-only');
        expect($flag->conditions)->toHaveKey('user_id');
        expect($flag->conditions['user_id'])->toBe([1, 2, 3]);
    });

    it('sets environment-specific flag', function () {
        $this->manager->setForEnvironment('env-feature', 'production');

        $prodContext = (new FeatureFlagContext())->withEnvironment('production');
        $devContext = (new FeatureFlagContext())->withEnvironment('development');

        expect($this->manager->isEnabled('env-feature', $prodContext))->toBeTrue();
        expect($this->manager->isEnabled('env-feature', $devContext))->toBeFalse();
    });

    it('sets expiration', function () {
        $this->manager->enable('temp-feature');

        $expiry = Timestamp::fromTimestamp(time() + 3600);
        $this->manager->setExpiration('temp-feature', $expiry);

        $flag = $this->manager->getFlag('temp-feature');
        expect($flag->expiresAt)->toBe($expiry);
    });

    it('throws exception when setting expiration on non-existent flag', function () {
        $expiry = Timestamp::fromTimestamp(time() + 3600);

        expect(fn () => $this->manager->setExpiration('non-existent', $expiry))
            ->toThrow(\InvalidArgumentException::class);
    });

    it('deletes a feature flag', function () {
        $this->manager->enable('delete-me');
        expect($this->manager->exists('delete-me'))->toBeTrue();

        $this->manager->deleteFlag('delete-me');
        expect($this->manager->exists('delete-me'))->toBeFalse();
    });

    it('gets all feature flags', function () {
        $this->manager->enable('flag1');
        $this->manager->enable('flag2');
        $this->manager->disable('flag3');

        $allFlags = $this->manager->getAllFlags();

        expect($allFlags)->toHaveCount(3);
    });

    it('generates status summary', function () {
        $this->manager->enable('enabled1');
        $this->manager->enable('enabled2');
        $this->manager->disable('disabled1');
        $this->manager->setConditional('conditional1', ['user_id' => [1]]);

        $summary = $this->manager->getStatusSummary();

        expect($summary['total'])->toBe(4);
        expect($summary['enabled'])->toBe(2);
        expect($summary['disabled'])->toBe(1);
        expect($summary['conditional'])->toBe(1);
    });

    it('uses default context when none provided', function () {
        $defaultContext = (new FeatureFlagContext())->withUserId('5');
        $manager = new FeatureFlagManager($this->repository, $defaultContext);

        $manager->setConditional('user-feature', ['user_id' => [5, 6, 7]]);

        // Should use default context
        expect($manager->isEnabled('user-feature'))->toBeTrue();
    });

    it('counts expired flags in summary', function () {
        $this->manager->enable('expired-feature');

        $pastExpiry = Timestamp::fromTimestamp(time() - 3600);
        $this->manager->setExpiration('expired-feature', $pastExpiry);

        $summary = $this->manager->getStatusSummary();

        expect($summary['expired'])->toBe(1);
    });
});