<?php

declare(strict_types=1);
/**
 * +----------------------------------------------------------------------
 * | ThinkAdmin Plugin
 * +----------------------------------------------------------------------
 * | Copyright (c) 2014~2026 ThinkAdmin [ thinkadmin.top ]
 * +----------------------------------------------------------------------
 * | Official Website: https://thinkadmin.top
 * +----------------------------------------------------------------------
 * | Licensed: https://mit-license.org
 * | Disclaimer: https://thinkadmin.top/disclaimer
 * | Vip Rights: https://thinkadmin.top/vip-introduce
 * +----------------------------------------------------------------------
 * | Gitee Repository: https://gitee.com/zoujingli/ThinkAdmin
 * | Github Repository: https://github.com/zoujingli/ThinkAdmin
 * +----------------------------------------------------------------------
 */

namespace think\admin\tests;

use PHPUnit\Framework\TestCase;

/**
 * @internal
 * @coversNothing
 */
class ComposerDependencyBoundaryTest extends TestCase
{
    private string $projectRoot;

    /**
     * @var array<string, array{name:string, path:string, require:array<string, string>}>
     */
    private array $packages = [];

    protected function setUp(): void
    {
        parent::setUp();
        $this->projectRoot = TEST_PROJECT_ROOT;
        $this->packages = $this->loadPackages();
    }

    public function testLocalPluginDependencyGraphIsAcyclic(): void
    {
        $graph = $this->localGraph();
        $state = [];
        $stack = [];
        $cycle = [];

        $visit = function (string $package) use (&$visit, &$graph, &$state, &$stack, &$cycle): void {
            if ($cycle !== []) {
                return;
            }
            $state[$package] = 1;
            $stack[] = $package;

            foreach ($graph[$package] ?? [] as $dependency) {
                $depState = $state[$dependency] ?? 0;
                if ($depState === 0) {
                    $visit($dependency);
                    if ($cycle !== []) {
                        return;
                    }
                    continue;
                }
                if ($depState === 1) {
                    $offset = array_search($dependency, $stack, true);
                    $cycle = array_slice($stack, $offset === false ? 0 : $offset);
                    $cycle[] = $dependency;
                    return;
                }
            }

            array_pop($stack);
            $state[$package] = 2;
        };

        foreach (array_keys($graph) as $package) {
            if (($state[$package] ?? 0) === 0) {
                $visit($package);
            }
        }

        $this->assertSame([], $cycle, 'Local composer dependency cycle detected: ' . implode(' -> ', $cycle));
    }

    public function testBasePackagesStayAtTheBottomOfDependencyGraph(): void
    {
        $this->assertSame([], $this->localRequires('zoujingli/think-library'));
        $this->assertSame([
            'zoujingli/think-library',
            'zoujingli/think-plugs-static',
            'zoujingli/think-plugs-worker',
        ], $this->localRequires('zoujingli/think-plugs-system'));
        $this->assertSame(['zoujingli/think-library'], $this->localRequires('zoujingli/think-plugs-worker'));
    }

    public function testSystemDoesNotReintroduceLegacyStoragePackage(): void
    {
        $system = $this->localRequires('zoujingli/think-plugs-system');

        $this->assertNotContains('zoujingli/think-plugs-storage', $system);
    }

    public function testHelperPackageStaysMergedIntoSystem(): void
    {
        $this->assertDirectoryDoesNotExist($this->path('plugin/think-plugs-helper'));
        $this->assertFileExists($this->path('plugin/think-plugs-system/src/helper/Service.php'));
        $this->assertFileExists($this->path('plugin/think-plugs-system/src/helper/command/project/PublishCommand.php'));

        $legacyHelperNamespace = 'plugin' . '\\helper\\';
        $systemComposer = $this->jsonFile($this->path('plugin/think-plugs-system/composer.json'));
        $systemPsr4 = is_array($systemComposer['autoload']['psr-4'] ?? null) ? $systemComposer['autoload']['psr-4'] : [];
        $systemServices = is_array($systemComposer['extra']['think']['services'] ?? null) ? $systemComposer['extra']['think']['services'] : [];

        $this->assertArrayNotHasKey($legacyHelperNamespace, $systemPsr4);
        $this->assertContains('plugin\system\helper\Service', $systemServices);
        $this->assertNotContains($legacyHelperNamespace . 'Service', $systemServices);

        $violations = [];
        foreach ($this->composerFiles() as $file) {
            $json = $this->jsonFile($file);

            if (str_ends_with($file, '/composer.lock')) {
                $packages = array_merge(
                    is_array($json['packages'] ?? null) ? $json['packages'] : [],
                    is_array($json['packages-dev'] ?? null) ? $json['packages-dev'] : []
                );

                foreach ($packages as $package) {
                    if (!is_array($package)) {
                        continue;
                    }
                    if (($package['name'] ?? null) === 'zoujingli/think-plugs-helper') {
                        $violations[] = [$file, 'package'];
                    }
                    foreach (['require', 'require-dev'] as $section) {
                        if (isset($package[$section]['zoujingli/think-plugs-helper'])) {
                            $violations[] = [$file, $section, $package['name'] ?? 'unknown'];
                        }
                    }
                }

                continue;
            }

            foreach (['require', 'require-dev'] as $section) {
                if (isset($json[$section]['zoujingli/think-plugs-helper'])) {
                    $violations[] = [$file, $section];
                }
            }
        }

        $this->assertSame([], $violations, 'Legacy helper package dependencies found: ' . json_encode($violations, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
    }

    public function testLegacyViewPackagesStayRemoved(): void
    {
        $legacyPackages = [
            'zoujingli/think-plugs-view' => 'plugin/think-plugs-view',
            'zoujingli/think-plugs-system-view' => 'plugin/think-plugs-system-view',
            'zoujingli/think-plugs-wechat-client-view' => 'plugin/think-plugs-wechat-client-view',
            'zoujingli/think-plugs-wechat-service-view' => 'plugin/think-plugs-wechat-service-view',
        ];

        foreach ($legacyPackages as $package => $directory) {
            $this->assertDirectoryDoesNotExist($this->path($directory), $package . ' directory should stay removed');
        }

        $violations = [];
        foreach ($this->composerFiles() as $file) {
            $content = file_get_contents($file) ?: '';
            foreach (array_keys($legacyPackages) as $package) {
                if (strpos($content, $package) !== false) {
                    $violations[] = [$package, $file];
                }
            }
        }

        $this->assertSame([], $violations, 'Legacy view package references found: ' . json_encode($violations, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
    }

    public function testEveryLocalDependencyPointsToAnExistingWorkspacePackage(): void
    {
        $known = array_keys($this->packages);
        $missing = [];

        foreach ($this->packages as $name => $package) {
            foreach ($this->localRequires($name) as $dependency) {
                if (!in_array($dependency, $known, true)) {
                    $missing[] = [$name, $dependency];
                }
            }
        }

        $this->assertSame([], $missing, 'Unknown local package dependencies found: ' . json_encode($missing, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
    }

    /**
     * @return array<string, array{name:string, path:string, require:array<string, string>}>
     */
    private function loadPackages(): array
    {
        $items = [];
        foreach (glob($this->path('plugin/*/composer.json')) ?: [] as $file) {
            $json = json_decode(file_get_contents($file) ?: '', true);
            if (!is_array($json) || empty($json['name'])) {
                continue;
            }
            $items[strval($json['name'])] = [
                'name' => strval($json['name']),
                'path' => $file,
                'require' => is_array($json['require'] ?? null) ? $json['require'] : [],
            ];
        }

        ksort($items);
        return $items;
    }

    /**
     * @return array<string, list<string>>
     */
    private function localGraph(): array
    {
        $graph = [];
        foreach (array_keys($this->packages) as $name) {
            $graph[$name] = $this->localRequires($name);
        }
        return $graph;
    }

    /**
     * @return list<string>
     */
    private function localRequires(string $package): array
    {
        $requires = array_keys($this->packages[$package]['require'] ?? []);
        $locals = array_values(array_filter($requires, fn (string $name): bool => isset($this->packages[$name])));
        sort($locals);
        return $locals;
    }

    /**
     * @return list<string>
     */
    private function composerFiles(): array
    {
        $files = [];

        foreach (['composer.json', 'composer.lock'] as $name) {
            $file = $this->path($name);
            if (is_file($file)) {
                $files[] = str_replace('\\', '/', $file);
            }
        }

        foreach (glob($this->path('plugin/*/composer.json')) ?: [] as $file) {
            $files[] = str_replace('\\', '/', $file);
        }

        sort($files);
        return $files;
    }

    /**
     * @return array<string, mixed>
     */
    private function jsonFile(string $file): array
    {
        $json = json_decode(file_get_contents($file) ?: '', true);
        return is_array($json) ? $json : [];
    }

    private function path(string $relative): string
    {
        return $this->projectRoot . '/' . ltrim($relative, '/');
    }
}