#!/usr/bin/env php
<?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.Release
 * INGROUP: MokoStandards.Scripts
 * REPO: https://git.mokoconsulting.tech/MokoConsulting/moko-platform
 * PATH: /release/generate_joomla_update_xml.php
 * BRIEF: Create or update the <downloadurl> in updates.xml on release
 *
 * Minimal Joomla Update Server helper.  On each release it:
 *   1. Reads the existing updates.xml, or bootstraps a new one from Makefile
 *      metadata if none exists yet.
 *   2. If an <update> entry for this version already exists, updates only
 *      its <downloadurl>.
 *   3. If this is a new version, clones the latest entry, bumps <version>
 *      and <downloadurl>, and prepends it.
 *   4. Optionally injects / refreshes the <updateservers> block in every
 *      Joomla XML install manifest found in the repo (--inject-updateserver).
 *
 * The script deliberately leaves all other fields (name, description, tags,
 * targetplatform, php_minimum, etc.) untouched so they can be maintained by
 * hand or by a separate process.
 *
 * Runs in two modes:
 *   Local  — reads/writes updates.xml on disk (for use inside a release
 *             workflow that has already checked out the repo).
 *   Remote — reads/commits updates.xml via GitHub API.
 *
 * Usage (local — GitHub Actions release workflow):
 *   php generate_joomla_update_xml.php \
 *       --tag=v1.2.0 \
 *       [--zip-url=https://github.com/org/repo/releases/download/v1.2.0/mod_foo-1.2.0.zip] \
 *       [--inject-updateserver]
 *
 * Usage (remote — from MokoStandards):
 *   php generate_joomla_update_xml.php \
 *       --repo=mokoconsulting-tech/WaasComponent \
 *       --tag=v1.2.0 \
 *       [--zip-url=https://…] \
 *       [--inject-updateserver]
 */

declare(strict_types=1);

require_once __DIR__ . '/../../vendor/autoload.php';
require_once __DIR__ . '/../lib/Enterprise/CliFramework.php';

use MokoEnterprise\{ApiClient, AuditLogger, CLIApp, Config};
use MokoStandards\Plugins\Joomla\UpdateXmlGenerator;

class GenerateJoomlaUpdateXml extends CLIApp
{
    public const VERSION = '04.06.00';

    private ?ApiClient  $api = null;
    private AuditLogger $logger;

    protected function setupArguments(): array
    {
        return [
            'repo:'               => 'GitHub repo (org/repo) for remote mode.',
            'tag:'                => 'Git tag for this release, e.g. v1.2.0 (required)',
            'zip-url:'            => 'Full URL to the release ZIP. Auto-derived from the tag + Makefile EXTENSION_NAME if omitted.',
            'inject-updateserver' => 'Inject / refresh <updateservers> in all Joomla XML manifests.',
            'output:'             => 'Local output path for updates.xml (default: ./updates.xml)',
            'makefile:'           => 'Local path to Makefile for ZIP URL derivation (default: ./Makefile)',
        ];
    }

    protected function run(): int
    {
        $this->log('📦 Joomla Update XML — release updater v' . self::VERSION, 'INFO');
        $this->logger = new AuditLogger('joomla_update_xml');

        $tag = $this->getOption('tag', '');
        if (empty($tag)) {
            $this->log('❌ --tag is required (e.g. --tag=v1.2.0)', 'ERROR');
            return 1;
        }

        $repoArg = $this->getOption('repo', '');
        return !empty($repoArg)
            ? $this->runRemote($repoArg, $tag)
            : $this->runLocal($tag);
    }

    // -------------------------------------------------------------------------
    // Remote mode
    // -------------------------------------------------------------------------

    private function runRemote(string $repoArg, string $tag): int
    {
        if (!$this->initApi()) {
            return 1;
        }

        if (!str_contains($repoArg, '/')) {
            $this->log('❌ --repo must be in org/repo format', 'ERROR');
            return 1;
        }
        [$org, $repo] = explode('/', $repoArg, 2);

        $repoData      = $this->api->get("/repos/{$org}/{$repo}");
        $defaultBranch = $repoData['default_branch'] ?? 'main';

        $existingXml = $this->fetchRemoteFile($org, $repo, 'updates.xml');
        if ($existingXml === null) {
            $this->log("ℹ️  updates.xml not found in {$org}/{$repo} — bootstrapping first entry", 'INFO');
            $zipUrl      = $this->resolveZipUrl($org, $repo, $tag);
            $existingXml = $this->bootstrapXml($org, $repo, $tag, $zipUrl);
        }

        $zipUrl = $this->resolveZipUrl($org, $repo, $tag);
        $xml    = $this->updateXml($existingXml, $tag, $zipUrl);

        if ($this->dryRun) {
            $this->log("(dry-run) updates.xml:\n{$xml}", 'INFO');
            return 0;
        }

        $sha = $this->fetchRemoteFileSha($org, $repo, 'updates.xml');
        $payload = [
            'message' => "chore(release): update download URL in updates.xml for {$tag}",
            'content' => base64_encode($xml),
            'branch'  => $defaultBranch,
        ];
        if ($sha !== null) {
            $payload['sha'] = $sha;
        }
        try {
            $this->api->put("/repos/{$org}/{$repo}/contents/updates.xml", $payload);
            $this->log("✅ updates.xml committed to {$defaultBranch}", 'INFO');
        } catch (\Exception $e) {
            $this->log('❌ Failed to commit: ' . $e->getMessage(), 'ERROR');
            return 1;
        }

        if ($this->hasOption('inject-updateserver')) {
            $this->injectUpdateServerRemote($org, $repo, $defaultBranch);
        }

        return 0;
    }

    // -------------------------------------------------------------------------
    // Local mode
    // -------------------------------------------------------------------------

    private function runLocal(string $tag): int
    {
        $outputPath = $this->getOption('output', './updates.xml');
        $ghRepo     = getenv('GITHUB_REPOSITORY') ?: '';
        [$org, $repo] = str_contains($ghRepo, '/') ? explode('/', $ghRepo, 2) : ['', ''];

        $zipUrl = $this->resolveZipUrl($org, $repo, $tag);

        if (!file_exists($outputPath)) {
            $this->log("ℹ️  {$outputPath} not found — bootstrapping first entry", 'INFO');
            $existingXml = $this->bootstrapXml($org, $repo, $tag, $zipUrl);
        } else {
            $existingXml = file_get_contents($outputPath) ?: '';
        }

        $xml = $this->updateXml($existingXml, $tag, $zipUrl);

        if ($this->dryRun) {
            $this->log("(dry-run) updates.xml:\n{$xml}", 'INFO');
            return 0;
        }

        if (file_put_contents($outputPath, $xml) === false) {
            $this->log("❌ Failed to write: {$outputPath}", 'ERROR');
            return 1;
        }
        $this->log("✅ updates.xml updated ({$outputPath})", 'INFO');

        // Validate structure
        $result = UpdateXmlGenerator::validate($xml);
        if (!$result['valid']) {
            foreach ($result['errors'] as $err) {
                $this->log("⚠️  {$err}", 'WARN');
            }
        } else {
            $this->log("✅ Structure validated", 'INFO');
        }

        if ($this->hasOption('inject-updateserver') && !empty($org) && !empty($repo)) {
            $url = "https://raw.githubusercontent.com/{$org}/{$repo}/main/updates.xml";
            foreach ($this->findJoomlaManifests('.') as $path) {
                $this->injectUpdateServerIntoFile($path, $url, $repo);
            }
        }

        return 0;
    }

    // -------------------------------------------------------------------------
    // Bootstrap — build a minimal updates.xml when none exists yet
    // -------------------------------------------------------------------------

    /**
     * Create a minimal but valid updates.xml skeleton with one <update> entry.
     * Called only when no updates.xml exists.  The resulting XML is immediately
     * handed to updateXml() so the canonical write path stays unchanged.
     */
    private function bootstrapXml(string $org, string $repo, string $tag, string $zipUrl): string
    {
        $version = ltrim($tag, 'vV');
        $vars    = $this->parseMakefileVars();

        $extensionName    = $vars['EXTENSION_NAME']         ?? $repo;
        $extensionType    = strtolower($vars['EXTENSION_TYPE']  ?? 'module');
        $displayName      = $vars['EXTENSION_DISPLAY_NAME'] ?? $repo;
        $pluginGroup      = strtolower($vars['PLUGIN_GROUP']    ?? 'system');
        $moduleType       = strtolower($vars['MODULE_TYPE']     ?? 'site');

        $element = match ($extensionType) {
            'module'    => "mod_{$extensionName}",
            'plugin'    => "plg_{$pluginGroup}_{$extensionName}",
            'component' => "com_{$extensionName}",
            'package'   => "pkg_{$extensionName}",
            'template'  => "tpl_{$extensionName}",
            default     => $extensionName,
        };

        // client attribute only applies to modules
        $clientAttr = ($extensionType === 'module')
            ? ' client="' . htmlspecialchars($moduleType, ENT_XML1) . '"'
            : '';

        $updateServerUrl = (!empty($org) && !empty($repo))
            ? "https://raw.githubusercontent.com/{$org}/{$repo}/main/updates.xml"
            : '';

        $updateServersBlock = $updateServerUrl !== ''
            ? "\n    <updateservers>\n        <server type=\"extension\" name=\"{$displayName} Updates\">{$updateServerUrl}</server>\n    </updateservers>"
            : '';

        $xml = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<updates>
    <update>
        <name>{$displayName}</name>
        <description>{$displayName} Joomla extension</description>
        <element>{$element}</element>
        <type>{$extensionType}</type>
        <version>{$version}</version>
        <downloads>
            <downloadurl type="full" format="zip"{$clientAttr}>{$zipUrl}</downloadurl>
        </downloads>
        <tags>
            <tag>stable</tag>
        </tags>
        <targetplatform name="joomla" version="4\.[0-9]+" />
        <php_minimum>8.1</php_minimum>{$updateServersBlock}
    </update>
</updates>
XML;

        $this->log("ℹ️  Bootstrapped updates.xml for {$element} v{$version}", 'INFO');
        return $xml;
    }

    /**
     * Parse Makefile variables (KEY = value / KEY := value / KEY ?= value).
     * @return array<string,string>
     */
    private function parseMakefileVars(): array
    {
        $path = $this->getOption('makefile', './Makefile');
        if (!file_exists($path)) {
            return [];
        }
        $vars = [];
        foreach (explode("\n", file_get_contents($path) ?: '') as $line) {
            if (preg_match('/^([A-Z_]+)\s*[:?]?=\s*(.+)$/', trim($line), $m)) {
                $vars[$m[1]] = trim($m[2]);
            }
        }
        return $vars;
    }

    // -------------------------------------------------------------------------
    // Core XML update — only touches <version> and <downloadurl>
    // -------------------------------------------------------------------------

    /**
     * Update updates.xml:
     *  - If an <update> entry for $tag's version exists → update its <downloadurl>
     *  - Otherwise → clone the first entry, set new <version> + <downloadurl>, prepend
     *
     * All other XML content is preserved byte-for-byte.
     */
    private function updateXml(string $xml, string $tag, string $zipUrl): string
    {
        $version = ltrim($tag, 'vV');

        $dom = new DOMDocument();
        $dom->formatOutput      = true;
        $dom->preserveWhiteSpace = false;
        if (!@$dom->loadXML($xml)) {
            $this->log('❌ Cannot parse existing updates.xml', 'ERROR');
            return $xml;
        }

        $updates = $dom->getElementsByTagName('updates')->item(0);
        if (!$updates) {
            $this->log('❌ No <updates> root in updates.xml', 'ERROR');
            return $xml;
        }

        $existingEntry = null;
        foreach ($updates->getElementsByTagName('update') as $node) {
            $vNode = $node->getElementsByTagName('version')->item(0);
            if ($vNode && trim($vNode->textContent) === $version) {
                $existingEntry = $node;
                break;
            }
        }

        if ($existingEntry !== null) {
            // Update only the downloadurl in the existing entry
            $dlNodes = $existingEntry->getElementsByTagName('downloadurl');
            if ($dlNodes->length > 0) {
                $dlNodes->item(0)->textContent = $zipUrl;
                $this->log("ℹ️  Updated <downloadurl> for existing v{$version} entry", 'INFO');
            }
        } else {
            // Clone the first (most recent) entry and set new version + url
            $firstEntry = $updates->getElementsByTagName('update')->item(0);
            if ($firstEntry === null) {
                $this->log('❌ No existing <update> entries to clone', 'ERROR');
                return $xml;
            }

            /** @var \DOMElement $newEntry */
            $newEntry = $firstEntry->cloneNode(true);

            // Set version
            $vNode = $newEntry->getElementsByTagName('version')->item(0);
            if ($vNode) {
                $vNode->textContent = $version;
            }

            // Set downloadurl
            $dlNode = $newEntry->getElementsByTagName('downloadurl')->item(0);
            if ($dlNode) {
                $dlNode->textContent = $zipUrl;
            }

            // Prepend before first entry
            $updates->insertBefore($newEntry, $firstEntry);
            $this->log("ℹ️  Prepended new v{$version} entry (cloned from latest)", 'INFO');
        }

        return $dom->saveXML() ?: $xml;
    }

    // -------------------------------------------------------------------------
    // ZIP URL resolution
    // -------------------------------------------------------------------------

    /**
     * Resolve the download ZIP URL in priority order:
     *   1. --zip-url CLI option
     *   2. GitHub Releases API (first .zip asset on the tag's release)
     *   3. Derived from EXTENSION_NAME in Makefile + standard GitHub releases path
     */
    private function resolveZipUrl(string $org, string $repo, string $tag): string
    {
        $explicit = $this->getOption('zip-url', '');
        if (!empty($explicit)) {
            return $explicit;
        }

        // Try GitHub Releases API
        if ($this->api !== null && !empty($org) && !empty($repo)) {
            try {
                $release = $this->api->get("/repos/{$org}/{$repo}/releases/tags/{$tag}");
                foreach ($release['assets'] ?? [] as $asset) {
                    if (str_ends_with($asset['name'] ?? '', '.zip')) {
                        $this->log("ℹ️  ZIP URL from release asset: {$asset['browser_download_url']}", 'INFO');
                        return $asset['browser_download_url'];
                    }
                }
            } catch (\Exception $e) {
                $this->log('⚠️  Could not query release assets: ' . $e->getMessage(), 'WARN');
            }
        }

        // Derive from Makefile
        $version  = ltrim($tag, 'vV');
        $element  = $this->elementFromMakefile();
        $zipName  = "{$element}-{$version}.zip";
        $derived  = "https://github.com/{$org}/{$repo}/releases/download/{$tag}/{$zipName}";
        $this->log("ℹ️  Derived ZIP URL: {$derived}", 'INFO');
        return $derived;
    }

    /**
     * Read EXTENSION_NAME and EXTENSION_TYPE from the local Makefile to
     * construct the element prefix (mod_, plg_, com_, etc.).
     */
    private function elementFromMakefile(): string
    {
        $vars  = $this->parseMakefileVars();
        $name  = $vars['EXTENSION_NAME'] ?? 'extension';
        $type  = strtolower($vars['EXTENSION_TYPE'] ?? 'module');
        $group = strtolower($vars['PLUGIN_GROUP'] ?? 'system');
        return match ($type) {
            'module'    => "mod_{$name}",
            'plugin'    => "plg_{$group}_{$name}",
            'component' => "com_{$name}",
            'package'   => "pkg_{$name}",
            'template'  => "tpl_{$name}",
            default     => $name,
        };
    }

    // -------------------------------------------------------------------------
    // <updateservers> injection into Joomla manifests
    // -------------------------------------------------------------------------

    private function injectUpdateServerRemote(string $org, string $repo, string $branch): void
    {
        $url = "https://raw.githubusercontent.com/{$org}/{$repo}/{$branch}/updates.xml";
        try {
            $tree = $this->api->get("/repos/{$org}/{$repo}/git/trees/{$branch}", ['recursive' => '1']);
            foreach ($tree['tree'] ?? [] as $node) {
                if (!str_ends_with($node['path'] ?? '', '.xml') || $node['type'] !== 'blob') {
                    continue;
                }
                $content = $this->fetchRemoteFile($org, $repo, $node['path']);
                if ($content === null || !$this->isJoomlaManifest($content)) {
                    continue;
                }
                $updated = $this->injectUpdateServerIntoXml($content, $url, $repo);
                if ($updated === null) {
                    continue;
                }
                $sha     = $this->fetchRemoteFileSha($org, $repo, $node['path']);
                $payload = [
                    'message' => 'chore(release): refresh <updateservers> URL in manifest',
                    'content' => base64_encode($updated),
                    'branch'  => $branch,
                ];
                if ($sha !== null) {
                    $payload['sha'] = $sha;
                }
                $this->api->put("/repos/{$org}/{$repo}/contents/{$node['path']}", $payload);
                $this->log("  ✅ updateservers → {$node['path']}", 'INFO');
            }
        } catch (\Exception $e) {
            $this->log('⚠️  updateservers injection failed: ' . $e->getMessage(), 'WARN');
        }
    }

    /** @return string[] */
    private function findJoomlaManifests(string $dir): array
    {
        $found    = [];
        $iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($dir));
        foreach ($iterator as $file) {
            if (!$file->isFile() || $file->getExtension() !== 'xml') {
                continue;
            }
            $content = file_get_contents((string) $file) ?: '';
            if ($this->isJoomlaManifest($content)) {
                $found[] = (string) $file;
            }
        }
        return $found;
    }

    private function isJoomlaManifest(string $xml): bool
    {
        return (bool) preg_match('/<extension\s[^>]*type=/', $xml);
    }

    private function injectUpdateServerIntoFile(string $path, string $url, string $repoName): void
    {
        $content = file_get_contents($path) ?: '';
        $updated = $this->injectUpdateServerIntoXml($content, $url, $repoName);
        if ($updated !== null) {
            file_put_contents($path, $updated);
            $this->log("  ✅ updateservers → {$path}", 'INFO');
        }
    }

    private function injectUpdateServerIntoXml(string $xml, string $url, string $repoName): ?string
    {
        $dom = new DOMDocument();
        $dom->formatOutput      = true;
        $dom->preserveWhiteSpace = false;
        if (!@$dom->loadXML($xml)) {
            return null;
        }
        $root = $dom->documentElement;
        if (!$root || strtolower($root->nodeName) !== 'extension') {
            return null;
        }

        // Remove existing block so we can replace it cleanly
        foreach (iterator_to_array($dom->getElementsByTagName('updateservers')) as $node) {
            $node->parentNode?->removeChild($node);
        }

        $servers = $dom->createElement('updateservers');
        $server  = $dom->createElement('server');
        $server->setAttribute('type', 'extension');
        $server->setAttribute('name', "{$repoName} Updates");
        $server->textContent = $url;
        $servers->appendChild($server);
        $root->appendChild($servers);

        $out = $dom->saveXML();
        return ($out !== false && $out !== $xml) ? $out : null;
    }

    // -------------------------------------------------------------------------
    // API helpers
    // -------------------------------------------------------------------------

    private function initApi(): bool
    {
        $config = Config::load();
        try {
            $this->adapter = \MokoEnterprise\PlatformAdapterFactory::create($config);
            $this->api     = $this->adapter->getApiClient();
            return true;
        } catch (\Exception $e) {
            $this->log('❌ API init failed: ' . $e->getMessage(), 'ERROR');
            return false;
        }
    }

    private function fetchRemoteFile(string $org, string $repo, string $path): ?string
    {
        try {
            $r = $this->api->get("/repos/{$org}/{$repo}/contents/{$path}");
            return base64_decode(str_replace(["\n", "\r"], '', $r['content'] ?? '')) ?: null;
        } catch (\Exception $e) {
            return null;
        }
    }

    private function fetchRemoteFileSha(string $org, string $repo, string $path): ?string
    {
        try {
            return $this->api->get("/repos/{$org}/{$repo}/contents/{$path}")['sha'] ?? null;
        } catch (\Exception $e) {
            return null;
        }
    }
}

// Execute if run directly
if (php_sapi_name() === 'cli' && isset($argv[0]) && realpath($argv[0]) === __FILE__) {
    $app = new GenerateJoomlaUpdateXml(
        'generate-joomla-update-xml',
        'Update the download URL in updates.xml on Joomla extension release',
        GenerateJoomlaUpdateXml::VERSION
    );
    exit($app->execute());
}