#!/usr/bin/env php
<?php

/* Copyright (C) 2026 Moko Consulting <hello@mokoconsulting.tech>
 * SPDX-License-Identifier: GPL-3.0-or-later
 * FILE INFORMATION
 * DEFGROUP: MokoPlatform.Scripts.Deploy
 * INGROUP: MokoPlatform
 * REPO: https://git.mokoconsulting.tech/MokoConsulting/mokocli
 * PATH: /deploy/deploy-and-verify.php
 * BRIEF: Deploy with automatic health check and rollback on failure
 */

declare(strict_types=1);

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

use MokoCli\{AuditLogger, CliFramework};

/**
 * Deploy-and-Verify: orchestrates backup → deploy → health-check → rollback.
 *
 * If the health check fails after deployment, automatically triggers a rollback
 * using the pre-deploy snapshot, with full audit trail.
 *
 * @see https://git.mokoconsulting.tech/MokoConsulting/mokocli/issues/147
 */
class DeployAndVerify extends CliFramework
{
    private ?AuditLogger $auditLogger = null;

    protected function configure(): void
    {
        $this->setDescription('Deploy with automatic health check and rollback on failure');
        $this->addArgument('--path',    'Repository root',                              '.');
        $this->addArgument('--env',     'Target environment: dev, demo, rs, live',      '');
        $this->addArgument('--config',  'Explicit sftp-config path (overrides --env)',   '');
        $this->addArgument('--url',     'Site URL for health check',                     '');
        $this->addArgument('--checks',  'Health checks: http,admin,api (comma-sep)',     'http');
        $this->addArgument('--timeout', 'Health check timeout in seconds',               '30');
        $this->addArgument('--retries', 'Health check retries before rollback',          '2');
        $this->addArgument('--delay',   'Seconds between health check retries',          '5');
    }

    protected function run(): int
    {
        $path    = realpath($this->getArgument('--path', '.')) ?: '.';
        $env     = $this->getArgument('--env', '');
        $config  = $this->getArgument('--config', '');
        $url     = $this->getArgument('--url', '');
        $checks  = $this->getArgument('--checks', 'http');
        $timeout = (int) $this->getArgument('--timeout', '30');
        $retries = (int) $this->getArgument('--retries', '2');
        $delay   = (int) $this->getArgument('--delay', '5');

        if ($url === '') {
            $this->log('ERROR', 'The --url argument is required for health checks');
            return self::EXIT_USAGE;
        }

        if ($env === '' && $config === '') {
            $this->log('ERROR', 'Specify --env or --config for the deploy target');
            return self::EXIT_USAGE;
        }

        try {
            $this->auditLogger = new AuditLogger('deploy-and-verify');
        } catch (\Exception $e) {
            // Non-fatal — proceed without audit logging
        }

        $this->audit('start', ['path' => $path, 'env' => $env, 'url' => parse_url($url, PHP_URL_HOST) ?? $url]);

        // ── Build subprocess args ────────────────────────────────────
        $deployArgs = $this->buildDeployArgs($path, $env, $config);

        // ── Step 1: Backup ───────────────────────────────────────────
        $this->section('Step 1: Pre-deploy backup');
        $snapshotDir = sys_get_temp_dir() . '/moko_deploy_snapshot_' . date('Ymd_His') . '_' . getmypid() . '_' . bin2hex(random_bytes(4));

        if ($this->dryRun) {
            $this->log('INFO', "[dry-run] Would create snapshot at {$snapshotDir}");
        } else {
            $backupExit = $this->runSubprocess('backup-before-deploy.php', array_merge(
                $deployArgs, ['--snapshot-dir', $snapshotDir]
            ));

            if ($backupExit !== 0) {
                $this->log('ERROR', 'Pre-deploy backup failed — aborting deployment');
                $this->audit('backup_failed', ['exit_code' => $backupExit]);
                return self::EXIT_FAILURE;
            }
            $this->log('INFO', "Snapshot saved to {$snapshotDir}");
        }

        // ── Step 2: Deploy ───────────────────────────────────────────
        $this->section('Step 2: Deploy');

        if ($this->dryRun) {
            $this->log('INFO', '[dry-run] Would run deploy-sftp.php ' . implode(' ', $deployArgs));
        } else {
            $deployExit = $this->runSubprocess('deploy-sftp.php', $deployArgs);

            if ($deployExit !== 0) {
                $this->log('ERROR', 'Deploy failed — rolling back to pre-deploy state');
                $this->audit('deploy_failed', ['exit_code' => $deployExit]);
                $this->runSubprocess('rollback-joomla.php', array_merge(
                    $deployArgs, ['--snapshot-dir', $snapshotDir]
                ));
                $this->cleanup($snapshotDir);
                return self::EXIT_FAILURE;
            }
            $this->log('INFO', 'Deploy completed successfully');
        }

        // ── Step 3: Health check (with retries) ──────────────────────
        $this->section('Step 3: Health check');

        if ($this->dryRun) {
            $this->log('INFO', "[dry-run] Would check {$url} with checks: {$checks}");
            $this->log('INFO', '[dry-run] Deploy-and-verify complete');
            return self::EXIT_SUCCESS;
        }

        $healthy = false;
        for ($attempt = 1; $attempt <= $retries; $attempt++) {
            $this->log('INFO', "Health check attempt {$attempt}/{$retries}...");

            if ($attempt > 1) {
                $this->log('INFO', "Waiting {$delay}s before retry...");
                sleep($delay);
            }

            $healthExit = $this->runHealthCheck($url, $checks, $timeout);

            if ($healthExit === 0) {
                $healthy = true;
                break;
            }

            $this->log('WARNING', "Health check attempt {$attempt} failed (exit {$healthExit})");
        }

        if ($healthy) {
            $this->section('Result: SUCCESS');
            $this->log('INFO', 'Health check passed — deploy verified');
            $this->audit('success', ['url' => $url, 'attempts' => $attempt]);
            $this->cleanup($snapshotDir);
            return self::EXIT_SUCCESS;
        }

        // ── Step 4: Rollback ─────────────────────────────────────────
        $this->section('Step 4: ROLLBACK');
        $this->log('ERROR', "Health check failed after {$retries} attempts — rolling back");
        $this->audit('rollback_triggered', ['url' => $url, 'retries' => $retries]);

        $rollbackExit = $this->runSubprocess('rollback-joomla.php', array_merge(
            $deployArgs, ['--snapshot-dir', $snapshotDir]
        ));

        if ($rollbackExit === 0) {
            $this->log('INFO', 'Rollback completed — site restored to pre-deploy state');
            $this->audit('rollback_success', []);

            // Verify rollback worked
            $postRollbackHealth = $this->runHealthCheck($url, $checks, $timeout);
            if ($postRollbackHealth === 0) {
                $this->log('INFO', 'Post-rollback health check passed — site is healthy');
            } else {
                $this->log('ERROR', 'Post-rollback health check FAILED — manual intervention needed');
                $this->audit('rollback_verification_failed', []);
            }
        } else {
            $this->log('ERROR', 'Rollback FAILED — manual intervention required');
            $this->audit('rollback_failed', ['exit_code' => $rollbackExit]);
        }

        $this->cleanup($snapshotDir);
        return self::EXIT_FAILURE;
    }

    // ── Health check (inline, no subprocess) ─────────────────────────

    private function runHealthCheck(string $url, string $checks, int $timeout): int
    {
        $url = rtrim($url, '/');
        $checkList = array_map('trim', explode(',', $checks));
        $failed = 0;

        foreach ($checkList as $check) {
            $checkUrl = match ($check) {
                'admin' => $url . '/administrator/',
                'api'   => $url . '/api/index.php/v1',
                default => $url,
            };

            $result = $this->httpGet($checkUrl, $timeout);

            if ($result === null) {
                $this->log('ERROR', "  [{$check}] FAIL: connection failed");
                $failed++;
                continue;
            }

            $validCodes = ($check === 'api') ? [200, 401] : [200];
            if (!in_array($result['http_code'], $validCodes, true)) {
                $this->log('ERROR', "  [{$check}] FAIL: HTTP {$result['http_code']}");
                $failed++;
                continue;
            }

            if ($this->containsFatalError($result['body'])) {
                $this->log('ERROR', "  [{$check}] FAIL: PHP fatal error in response");
                $failed++;
                continue;
            }

            $this->log('INFO', "  [{$check}] PASS: HTTP {$result['http_code']} ({$result['time_ms']}ms)");
        }

        return $failed > 0 ? 1 : 0;
    }

    private function httpGet(string $url, int $timeout): ?array
    {
        $ch = curl_init();
        curl_setopt_array($ch, [
            CURLOPT_URL            => $url,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_MAXREDIRS      => 5,
            CURLOPT_TIMEOUT        => $timeout,
            CURLOPT_CONNECTTIMEOUT => $timeout,
            CURLOPT_SSL_VERIFYPEER => true,
            CURLOPT_USERAGENT      => 'MokoDeployVerify/1.0',
        ]);

        $body = curl_exec($ch);
        if (curl_errno($ch)) {
            curl_close($ch);
            return null;
        }

        $httpCode  = (int) curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $totalTime = curl_getinfo($ch, CURLINFO_TOTAL_TIME);
        curl_close($ch);

        return [
            'http_code' => $httpCode,
            'body'      => is_string($body) ? $body : '',
            'time_ms'   => (int) round($totalTime * 1000),
        ];
    }

    private function containsFatalError(string $body): bool
    {
        foreach (['Fatal error:', 'Fatal Error', 'Parse error:', 'Uncaught Error:', 'Uncaught Exception:'] as $pattern) {
            if (stripos($body, $pattern) !== false) {
                return true;
            }
        }
        return false;
    }

    // ── Subprocess helpers ───────────────────────────────────────────

    private function runSubprocess(string $script, array $args): int
    {
        $scriptPath = __DIR__ . '/' . $script;
        if (!is_file($scriptPath)) {
            $this->log('ERROR', "Script not found: {$scriptPath}");
            return 127;
        }

        $cmd = sprintf('php %s %s 2>&1',
            escapeshellarg($scriptPath),
            implode(' ', array_map('escapeshellarg', $args))
        );

        $this->log('DEBUG', "Running: {$cmd}");
        passthru($cmd, $exitCode);
        return $exitCode;
    }

    private function buildDeployArgs(string $path, string $env, string $config): array
    {
        $args = ['--path', $path];
        if ($config !== '') {
            $args[] = '--config';
            $args[] = $config;
        } elseif ($env !== '') {
            $args[] = '--env';
            $args[] = $env;
        }
        if ($this->dryRun) {
            $args[] = '--dry-run';
        }
        return $args;
    }

    // ── Audit ────────────────────────────────────────────────────────

    private function audit(string $event, array $data): void
    {
        if ($this->auditLogger === null) {
            return;
        }
        try {
            $this->auditLogger->logInfo("deploy-verify:{$event}", $data);
        } catch (\Exception $e) {
            // Non-fatal
        }
    }

    // ── Cleanup ──────────────────────────────────────────────────────

    private function cleanup(string $snapshotDir): void
    {
        if (is_dir($snapshotDir)) {
            $this->removeDirectory($snapshotDir);
            $this->log('DEBUG', "Cleaned up snapshot: {$snapshotDir}");
        }
    }

    private function removeDirectory(string $dir): void
    {
        $entries = scandir($dir);
        if ($entries === false) {
            return;
        }
        foreach ($entries as $entry) {
            if ($entry === '.' || $entry === '..') {
                continue;
            }
            $path = $dir . DIRECTORY_SEPARATOR . $entry;
            is_dir($path) ? $this->removeDirectory($path) : unlink($path);
        }
        rmdir($dir);
    }
}

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