<?php

/* Copyright (C) 2026 Moko Consulting <hello@mokoconsulting.tech>
 *
 * This file is part of a Moko Consulting project.
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 * FILE INFORMATION
 * DEFGROUP: MokoStandards.Enterprise.Platform
 * INGROUP: MokoStandards.Enterprise
 * REPO: https://git.mokoconsulting.tech/MokoConsulting/moko-platform
 * PATH: /lib/Enterprise/PlatformAdapterFactory.php
 * BRIEF: Factory for creating platform-specific GitPlatformAdapter instances
 */

declare(strict_types=1);

namespace MokoEnterprise;

use RuntimeException;

/**
 * Factory for creating GitPlatformAdapter instances.
 *
 * Reads GIT_PLATFORM env var (default: 'github') and constructs
 * the appropriate adapter with correct base URL, auth scheme, and token.
 *
 * Usage:
 * ```php
 * $config = Config::load();
 * $adapter = PlatformAdapterFactory::create($config);
 * $repos = $adapter->listOrgRepos('mokoconsulting-tech');
 * ```
 *
 * @package MokoStandards\Enterprise
 * @version 04.06.10
 *
 * @since 04.00.00
 */
class PlatformAdapterFactory
{
    /**
     * Create a GitPlatformAdapter based on configuration.
     *
     * @param Config $config Configuration instance
     * @param string|null $platformOverride Force a specific platform ('github' or 'gitea')
     * @return GitPlatformAdapter The constructed adapter
     * @throws RuntimeException If the platform is not supported or token is missing
     */
    public static function create(Config $config, ?string $platformOverride = null): GitPlatformAdapter
    {
        $platform = $platformOverride ?? $config->getString('platform', 'gitea');

        return match ($platform) {
            'github' => self::createGitHubAdapter($config),
            'gitea'  => self::createMokoGiteaAdapter($config),
            default  => throw new RuntimeException("Unsupported git platform: {$platform}. Use 'github' or 'gitea'."),
        };
    }

    /**
     * Create a GitHubAdapter with configured ApiClient.
     *
     * @param Config $config Configuration instance
     * @return GitHubAdapter Configured GitHub adapter
     * @throws RuntimeException If GitHub token is not available
     */
    private static function createGitHubAdapter(Config $config): GitHubAdapter
    {
        $token = $config->getString('github.token', '');
        if (empty($token)) {
            throw new RuntimeException(
                'GitHub token not found. Set GH_TOKEN, GITHUB_TOKEN, or authenticate with `gh auth login`.'
            );
        }

        $apiClient = new ApiClient(
            baseUrl: 'https://git.mokoconsulting.tech/api/v1',
            authToken: $token,
            maxRequestsPerHour: $config->getInt('github.rate_limit', 5000),
            maxRetries: $config->getInt('github.max_retries', 3),
            authScheme: 'Bearer'
        );

        return new GitHubAdapter($apiClient);
    }

    /**
     * Create a MokoGiteaAdapter with configured ApiClient.
     *
     * @param Config $config Configuration instance
     * @return MokoGiteaAdapter Configured Gitea adapter
     * @throws RuntimeException If Gitea token is not available
     */
    private static function createMokoGiteaAdapter(Config $config): MokoGiteaAdapter
    {
        $token = $config->getString('gitea.token', '');
        if (empty($token)) {
            throw new RuntimeException(
                'Gitea token not found. Set GA_TOKEN environment variable.'
            );
        }

        $giteaUrl = $config->getString('gitea.url', 'https://git.mokoconsulting.tech');
        $apiBaseUrl = rtrim($giteaUrl, '/') . '/api/v1';

        $apiClient = new ApiClient(
            baseUrl: $apiBaseUrl,
            authToken: $token,
            maxRequestsPerHour: $config->getInt('gitea.rate_limit', 5000),
            maxRetries: $config->getInt('gitea.max_retries', 3),
            authScheme: 'token'
        );

        return new MokoGiteaAdapter($apiClient, $apiBaseUrl);
    }

    /**
     * Create adapters for both platforms (useful during migration).
     *
     * @param Config $config Configuration instance
     * @return array{github: GitHubAdapter, gitea: MokoGiteaAdapter} Both adapters
     * @throws RuntimeException If either token is missing
     */
    public static function createBoth(Config $config): array
    {
        return [
            'github' => self::createGitHubAdapter($config),
            'gitea'  => self::createMokoGiteaAdapter($config),
        ];
    }

    /**
     * Sync a file between Gitea (primary) and GitHub (mirror) for a given repo.
     *
     * Reads the file from Gitea and pushes it to GitHub, ensuring both platforms
     * serve identical content. Commonly used for updates.xml sync after releases.
     *
     * @param Config $config Configuration instance
     * @param string $repo Repository name
     * @param string $branch Branch to sync (default: 'main')
     * @param string $filePath Path to the file (default: 'updates.xml')
     * @return bool True if sync succeeded or file was already identical
     * @throws RuntimeException If either platform is unreachable
     */
    public static function syncUpdatesBetweenPlatforms(
        Config $config,
        string $repo,
        string $branch = 'main',
        string $filePath = 'updates.xml'
    ): bool {
        $adapters = self::createBoth($config);
        $giteaOrg = $config->getString('gitea.organization', 'mokoconsulting-tech');
        $githubOrg = $config->getString('github.organization', 'mokoconsulting-tech');

        // Read from Gitea (primary)
        try {
            $giteaFile = $adapters['gitea']->getFileContents($giteaOrg, $repo, $filePath, $branch);
        } catch (\Exception $e) {
            throw new RuntimeException("Failed to read {$filePath} from Gitea ({$giteaOrg}/{$repo}): " . $e->getMessage());
        }

        $giteaContent = base64_decode($giteaFile['content'] ?? '');
        if (empty($giteaContent)) {
            return false;
        }

        // Read from GitHub (mirror) to check if update is needed
        $githubSha = null;
        try {
            $githubFile = $adapters['github']->getFileContents($githubOrg, $repo, $filePath, $branch);
            $githubContent = base64_decode($githubFile['content'] ?? '');
            $githubSha = $githubFile['sha'] ?? null;

            if ($githubContent === $giteaContent) {
                return true;
            }
        } catch (\Exception $e) {
            $adapters['github']->getApiClient()->resetCircuitBreaker();
        }

        $adapters['github']->createOrUpdateFile(
            $githubOrg,
            $repo,
            $filePath,
            $giteaContent,
            "chore(sync): sync {$filePath} from Gitea primary",
            $githubSha,
            $branch
        );

        return true;
    }
}