#!/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: MokoPlatform.Automation
 * INGROUP: MokoPlatform.Scripts
 * REPO: https://git.mokoconsulting.tech/MokoConsulting/mokocli
 * PATH: /automation/repo_cleanup.php
 * BRIEF: Enterprise repository cleanup — branches, PRs, issues, workflows, labels, logs
 */

declare(strict_types=1);

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

use MokoCli\{ApiClient, AuditLogger, CliFramework, Config, GitPlatformAdapter, MetricsCollector, PlatformAdapterFactory};

/**
 * Enterprise Repository Cleanup
 *
 * Comprehensive maintenance tool for governed repositories:
 *   1. Delete stale sync branches (keeps current versioned branch)
 *   2. Close superseded PRs on deleted branches
 *   3. Close/lock resolved tracking issues where linked PR is merged
 *   4. Delete retired workflow files from repos
 *   5. Clean cancelled/stale workflow runs
 *   6. Delete workflow run logs older than N days
 *   7. Verify and provision standard labels
 *   8. Version drift detection
 */
class RepoCleanup extends CliFramework
{
    private const VERSION        = '09.23.00';
    private const SYNC_PREFIX    = 'chore/sync-mokocli-';
    private const CURRENT_BRANCH = 'chore/sync-mokocli-v04.02.00';

    /** Workflow files that have been retired and should be deleted from governed repos. */
    private const RETIRED_WORKFLOWS = [
        'build.yml', 'code-quality.yml', 'release-cycle.yml', 'release-pipeline.yml',
        'branch-cleanup.yml', 'auto-update-changelog.yml', 'enterprise-issue-manager.yml',
        'flush-actions-cache.yml', 'mokocli-script-runner.yml', 'unified-ci.yml',
        'unified-platform-testing.yml', 'reusable-build.yml', 'reusable-ci-validation.yml',
        'reusable-deploy.yml', 'reusable-php-quality.yml', 'reusable-platform-testing.yml',
        'reusable-project-detector.yml', 'reusable-release.yml', 'reusable-script-executor.yml',
        'rebuild-docs-indexes.yml', 'setup-project-v2.yml', 'sync-docs-to-project.yml',
        'release.yml', 'sync-changelogs.yml', 'version_branch.yml',
        'publish-to-mokodolibarr.yml', 'ci.yml',
        'deploy-rs.yml',
    ];

    private ApiClient $api;
    private GitPlatformAdapter $adapter;
    protected bool $dryRun = false;
    private float $startTime;

    protected function configure(): void
    {
        $this->setDescription('Enterprise repository cleanup');
        $this->addArgument('--org', 'GitHub organization', 'MokoConsulting');
        $this->addArgument('--repos', 'Specific repos (space-separated)', '');
        $this->addArgument('--skip-archived', 'Skip archived repos', false);
        $this->addArgument('--close-issues', 'Close resolved tracking issues', false);
        $this->addArgument('--lock-old-issues', 'Lock issues closed >30 days', false);
        $this->addArgument('--clean-workflows', 'Delete stale workflow runs', false);
        $this->addArgument('--clean-logs', 'Delete old workflow logs', false);
        $this->addArgument('--log-days', 'Days to keep logs', '30');
        $this->addArgument('--delete-retired', 'Delete retired workflows', false);
        $this->addArgument('--check-labels', 'Verify labels exist', false);
        $this->addArgument('--check-drift', 'Check version drift', false);
        $this->addArgument('--all', 'Run all operations', false);
        $this->addArgument('--yes', 'Auto-confirm', false);
        $this->addArgument('--json', 'Output as JSON', false);
    }

    protected function run(): int
    {
        $this->startTime = microtime(true);
        $org = $this->getArgument('--org', 'MokoConsulting');
        $this->dryRun = (bool) $this->getArgument('--dry-run', false);
        $runAll = (bool) $this->getArgument('--all', false);

        $config = Config::load();

        try {
            $this->adapter = PlatformAdapterFactory::create($config);
            $this->api     = $this->adapter->getApiClient();
        } catch (\Exception $e) {
            $this->errorMsg('Failed to initialize platform adapter: ' . $e->getMessage());
            return 1;
        }


        $this->logMsg("🧹 mokocli Repository Cleanup v" . self::VERSION);
        $this->logMsg("Organization: {$org}");
        $this->logMsg("Current sync branch: " . self::CURRENT_BRANCH);
        if ($this->dryRun) {
            $this->logMsg("⚠️  DRY RUN — no changes will be made");
        }
        $this->logMsg('');

        $repos = $this->fetchRepositories($org);
        $this->logMsg("Found " . count($repos) . " repositories");
        $this->logMsg('');

        $results = [
            'repos_processed'    => 0,
            'repos_cleaned'      => 0,
            'branches_deleted'   => 0,
            'prs_closed'         => 0,
            'issues_closed'      => 0,
            'issues_locked'      => 0,
            'workflows_deleted'  => 0,
            'runs_deleted'       => 0,
            'logs_deleted'       => 0,
            'labels_missing'     => 0,
            'version_drift'      => 0,
            'retired_files'      => 0,
            'errors'             => 0,
        ];

        foreach ($repos as $i => $repo) {
            $name = $repo['name'];
            $num  = $i + 1;
            $total = count($repos);
            $this->logMsg("[{$num}/{$total}] {$name}");
            $results['repos_processed']++;

            try {
                $this->api->resetCircuitBreaker();
                $cleaned = false;

                // Always: delete old sync branches + close their PRs
                $cleaned = $this->cleanBranches($org, $name, $results) || $cleaned;

                // Optional: close resolved issues
                if ($runAll || $this->getArgument('--close-issues', false)) {
                    $cleaned = $this->closeResolvedIssues($org, $name, $results) || $cleaned;
                }

                // Optional: lock old closed issues
                if ($runAll || $this->getArgument('--lock-old-issues', false)) {
                    $cleaned = $this->lockOldIssues($org, $name, $results) || $cleaned;
                }

                // Optional: delete retired workflow files
                if ($runAll || $this->getArgument('--delete-retired', false)) {
                    $cleaned = $this->deleteRetiredWorkflows($org, $name, $results) || $cleaned;
                }

                // Optional: clean workflow runs
                if ($runAll || $this->getArgument('--clean-workflows', false)) {
                    $cleaned = $this->cleanWorkflowRuns($org, $name, $results) || $cleaned;
                }

                // Optional: clean old logs
                if ($runAll || $this->getArgument('--clean-logs', false)) {
                    $cleaned = $this->cleanOldLogs($org, $name, $results) || $cleaned;
                }

                // Optional: check labels
                if ($runAll || $this->getArgument('--check-labels', false)) {
                    $this->checkLabels($org, $name, $results);
                }

                // Optional: check version drift
                if ($runAll || $this->getArgument('--check-drift', false)) {
                    $this->checkVersionDrift($org, $name, $results);
                }

                if ($cleaned) {
                    $results['repos_cleaned']++;
                }
            } catch (\Exception $e) {
                $this->errorMsg("  ✗ {$name}: " . $e->getMessage());
                $results['errors']++;
            }
        }

        $duration = round(microtime(true) - $this->startTime, 1);

        $this->logMsg('');
        $this->logMsg('============================================================');
        $this->logMsg("🧹 Cleanup Complete ({$duration}s)");
        $this->logMsg('============================================================');
        $this->logMsg("Repos processed:     {$results['repos_processed']}");
        $this->logMsg("Repos with changes:  {$results['repos_cleaned']}");
        $this->logMsg("Branches deleted:    {$results['branches_deleted']}");
        $this->logMsg("PRs closed:          {$results['prs_closed']}");
        $this->logMsg("Issues closed:       {$results['issues_closed']}");
        $this->logMsg("Issues locked:       {$results['issues_locked']}");
        $this->logMsg("Retired files:       {$results['retired_files']}");
        $this->logMsg("Workflow runs:       {$results['runs_deleted']}");
        $this->logMsg("Logs cleaned:        {$results['logs_deleted']}");
        $this->logMsg("Labels missing:      {$results['labels_missing']}");
        $this->logMsg("Version drift:       {$results['version_drift']}");
        $this->logMsg("Errors:              {$results['errors']}");
        $this->logMsg('============================================================');

        if ($this->getArgument('--json', false)) {
            $results['duration_seconds'] = $duration;
            echo json_encode($results, JSON_PRETTY_PRINT) . "\n";
        }

        return $results['errors'] > 0 ? 1 : 0;
    }

    // ─── Repository fetching ─────────────────────────────────────────────

    private function fetchRepositories(string $org): array
    {
        $specificRepos = trim((string) $this->getArgument('--repos', ''));
        $skipArchived  = (bool) $this->getArgument('--skip-archived', false);

        if (!empty($specificRepos)) {
            $names = preg_split('/[\s,]+/', $specificRepos);
            return array_map(fn($n) => ['name' => trim($n), 'archived' => false], $names);
        }

        $allRepos = $this->adapter->listOrgRepos($org, $skipArchived);
        return array_filter($allRepos, fn($r) => !in_array($r['name'], ['mokocli', '.github-private'], true));
    }

    // ─── Cleanup operations ──────────────────────────────────────────────

    private function cleanBranches(string $org, string $repo, array &$results): bool
    {
        $changed = false;
        try {
            $branches = $this->api->get("/repos/{$org}/{$repo}/branches", ['per_page' => 100]);
        } catch (\Exception $e) {
            return false;
        }

        foreach ($branches as $branch) {
            $name = $branch['name'] ?? '';
            if (!str_starts_with($name, self::SYNC_PREFIX) || $name === self::CURRENT_BRANCH) {
                continue;
            }

            // Close open PRs on this branch
            try {
                $prs = $this->api->get("/repos/{$org}/{$repo}/pulls", [
                    'state' => 'open', 'head' => "{$org}:{$name}", 'per_page' => 10,
                ]);
                foreach ($prs as $pr) {
                    if (($pr['number'] ?? 0) > 0 && !$this->dryRun) {
                        $this->api->patch("/repos/{$org}/{$repo}/pulls/{$pr['number']}", ['state' => 'closed']);
                    }
                    $this->logMsg("  🔒 Closed PR #{$pr['number']} ({$name})");
                    $results['prs_closed']++;
                    $changed = true;
                }
            } catch (\Exception $e) {
/* non-fatal */
            }

            if (!$this->dryRun) {
                try {
                    $this->api->delete("/repos/{$org}/{$repo}/git/refs/heads/{$name}");
                } catch (\Exception $e) {
                    continue;
                }
            }
            $this->logMsg("  🗑️  Deleted branch: {$name}");
            $results['branches_deleted']++;
            $changed = true;
        }

        return $changed;
    }

    private function closeResolvedIssues(string $org, string $repo, array &$results): bool
    {
        $changed = false;
        foreach (['standards-update', 'standards-drift'] as $label) {
            try {
                $issues = $this->api->get("/repos/{$org}/{$repo}/issues", [
                    'labels' => $label, 'state' => 'open', 'per_page' => 10,
                ]);
            } catch (\Exception $e) {
                continue;
            }

            foreach ($issues as $issue) {
                $num  = $issue['number'] ?? 0;
                $body = $issue['body'] ?? '';
                if (preg_match('/\[#(\d+)\]/', $body, $m)) {
                    $prNum = (int) $m[1];
                    try {
                        $pr = $this->api->get("/repos/{$org}/{$repo}/pulls/{$prNum}");
                        if (!empty($pr['merged_at'])) {
                            if (!$this->dryRun) {
                                $this->api->patch("/repos/{$org}/{$repo}/issues/{$num}", [
                                    'state' => 'closed', 'state_reason' => 'completed',
                                ]);
                            }
                            $this->logMsg("  ✅ Closed issue #{$num} (PR #{$prNum} merged)");
                            $results['issues_closed']++;
                            $changed = true;
                        }
                    } catch (\Exception $e) {
/* non-fatal */
                    }
                }
            }
        }
        return $changed;
    }

    private function lockOldIssues(string $org, string $repo, array &$results): bool
    {
        $changed = false;
        $cutoff = date('Y-m-d\TH:i:s\Z', strtotime('-30 days'));

        try {
            $issues = $this->api->get("/repos/{$org}/{$repo}/issues", [
                'state' => 'closed', 'per_page' => 50, 'sort' => 'updated', 'direction' => 'asc',
            ]);
        } catch (\Exception $e) {
            return false;
        }

        foreach ($issues as $issue) {
            $closedAt = $issue['closed_at'] ?? '';
            $locked   = $issue['locked'] ?? false;
            $num      = $issue['number'] ?? 0;

            if ($locked || $closedAt > $cutoff || $num === 0) {
                continue;
            }

            if (!$this->dryRun) {
                try {
                    $this->api->put("/repos/{$org}/{$repo}/issues/{$num}/lock", [
                        'lock_reason' => 'resolved',
                    ]);
                } catch (\Exception $e) {
                    continue;
                }
            }
            $results['issues_locked']++;
            $changed = true;
        }

        if ($results['issues_locked'] > 0) {
            $this->logMsg("  🔒 Locked {$results['issues_locked']} old closed issue(s)");
        }
        return $changed;
    }

    private function deleteRetiredWorkflows(string $org, string $repo, array &$results): bool
    {
        $changed = false;
        $defaultBranch = 'main';
        try {
            $repoInfo = $this->api->get("/repos/{$org}/{$repo}");
            $defaultBranch = $repoInfo['default_branch'] ?? 'main';
        } catch (\Exception $e) {
/* fallback to main */
        }

        // Check both workflow directories for retired workflows (supports dual-platform repos)
        $wfDirs = array_unique(['.github/workflows', '.mokogitea/workflows', $this->adapter->getWorkflowDir()]);
        foreach (self::RETIRED_WORKFLOWS as $wf) {
            foreach ($wfDirs as $wfDir) {
                $path = "{$wfDir}/{$wf}";
                try {
                    $file = $this->api->get("/repos/{$org}/{$repo}/contents/{$path}");
                    $sha  = $file['sha'] ?? '';
                    if (empty($sha)) {
                        continue;
                    }

                    if (!$this->dryRun) {
                        $this->api->delete("/repos/{$org}/{$repo}/contents/{$path}", [
                            'message' => "chore: delete retired workflow {$wf}",
                            'sha'     => $sha,
                            'branch'  => $defaultBranch,
                        ]);
                    }
                    $this->logMsg("  Deleted retired: {$wf} (from {$wfDir})");
                    $results['retired_files']++;
                    $changed = true;
                } catch (\Exception $e) {
                    // File doesn't exist in this dir — skip
                    $this->api->resetCircuitBreaker();
                }
            }
        }
        return $changed;
    }

    private function cleanWorkflowRuns(string $org, string $repo, array &$results): bool
    {
        $changed = false;
        foreach (['cancelled', 'stale'] as $status) {
            try {
                $runs = $this->api->get("/repos/{$org}/{$repo}/actions/runs", [
                    'status' => $status, 'per_page' => 100,
                ]);
                foreach (($runs['workflow_runs'] ?? []) as $run) {
                    $id = $run['id'] ?? 0;
                    if ($id > 0 && !$this->dryRun) {
                        try {
                            $this->api->delete("/repos/{$org}/{$repo}/actions/runs/{$id}");
                            $results['runs_deleted']++;
                            $changed = true;
                        } catch (\Exception $e) {
                            $this->api->resetCircuitBreaker();
                        }
                    }
                }
            } catch (\Exception $e) {
/* non-fatal */
            }
        }
        if ($results['runs_deleted'] > 0) {
            $this->logMsg("  🔄 Cleaned {$results['runs_deleted']} workflow run(s)");
        }
        return $changed;
    }

    private function cleanOldLogs(string $org, string $repo, array &$results): bool
    {
        $changed = false;
        $days = (int) $this->getArgument('--log-days', '30');
        $cutoff = date('Y-m-d\TH:i:s\Z', strtotime("-{$days} days"));

        try {
            $runs = $this->api->get("/repos/{$org}/{$repo}/actions/runs", [
                'created' => "<{$cutoff}", 'per_page' => 100,
            ]);
            foreach (($runs['workflow_runs'] ?? []) as $run) {
                $id = $run['id'] ?? 0;
                if ($id > 0 && !$this->dryRun) {
                    try {
                        $this->api->delete("/repos/{$org}/{$repo}/actions/runs/{$id}/logs");
                        $results['logs_deleted']++;
                        $changed = true;
                    } catch (\Exception $e) {
                        $this->api->resetCircuitBreaker();
                    }
                }
            }
        } catch (\Exception $e) {
/* non-fatal */
        }

        if ($results['logs_deleted'] > 0) {
            $this->logMsg("  📋 Cleaned {$results['logs_deleted']} old log(s)");
        }
        return $changed;
    }

    private function checkLabels(string $org, string $repo, array &$results): void
    {
        try {
            $this->api->get("/repos/{$org}/{$repo}/labels/mokocli");
        } catch (\Exception $e) {
            $this->logMsg("  ⚠️  Missing 'mokocli' label");
            $results['labels_missing']++;
            $this->api->resetCircuitBreaker();
        }
    }

    private function checkVersionDrift(string $org, string $repo, array &$results): void
    {
        try {
            $file = $this->api->get("/repos/{$org}/{$repo}/contents/README.md");
            $content = base64_decode($file['content'] ?? '');
            if (preg_match('/^\s*VERSION:\s*(\d{2}\.\d{2}\.\d{2})/m', $content, $m)) {
                $version = $m[1];

                // Check manifest.xml for the tracked mokocli version
                try {
                    $mokoFile = $this->api->get("/repos/{$org}/{$repo}/contents/.mokogitea/manifest.xml");
                    $mokoContent = base64_decode($mokoFile['content'] ?? '');
                    if (preg_match('/standards_version:\s*(\d{2}\.\d{2}\.\d{2})/m', $mokoContent, $vm)) {
                        if ($vm[1] !== self::VERSION) {
                            $this->logMsg("  ⚠️  Standards drift: {$vm[1]} (expected " . self::VERSION . ")");
                            $results['version_drift']++;
                        }
                    }
                } catch (\Exception $e) {
                    $this->api->resetCircuitBreaker();
                }
            }
        } catch (\Exception $e) {
            $this->api->resetCircuitBreaker();
        }
    }

    // ─── Helpers ─────────────────────────────────────────────────────────

    private function logMsg(string $message): void
    {
        if (!$this->quiet) {
            echo $message . "\n";
        }
    }

    private function errorMsg(string $message): void
    {
        fwrite(STDERR, $message . "\n");
    }
}

$app = new RepoCleanup();
exit($app->execute());