<?php

namespace App\Http\Controllers\Api;

use Illuminate\Support\Facades\DB;
use Symfony\Component\HttpFoundation\Response;

class HealthController extends BaseApiController
{
    /**
     * Check if a path exists and is writable
     */
    private function checkPath(string $label, string $path): array
    {
        return [
            'label'    => $label,
            'path'     => $path,
            'exists'   => is_dir($path),
            'writable' => is_writable($path),
        ];
    }

    /**
     * Health check endpoint - checks filesystem paths and database schema
     */
    public function index()
    {
        try {
            // Use storage_path('app') as the base (equivalent to WRITEPATH in CodeIgniter)
            $uploadsBase = storage_path('app') . DIRECTORY_SEPARATOR . 'uploads';
            
            $paths = [
                'uploads'                 => $uploadsBase,
                'uploads/reimbursements'  => $uploadsBase . DIRECTORY_SEPARATOR . 'reimbursements',
                'uploads/receipts'        => $uploadsBase . DIRECTORY_SEPARATOR . 'receipts',
                'uploads/checks'          => $uploadsBase . DIRECTORY_SEPARATOR . 'checks',
            ];

            $pathsStatus = [];
            foreach ($paths as $label => $p) {
                $pathsStatus[] = $this->checkPath($label, $p);
            }

            // Use Laravel's schema builder to check tables and columns
            $schema = DB::getSchemaBuilder();
            
            $dbChecks = [
                'user_preferences_exists' => $schema->hasTable('user_preferences'),
                'settings_exists'         => $schema->hasTable('settings'),
                'migrations_exists'       => $schema->hasTable('migrations'),
            ];

            $dbChecks['user_preferences_has_timezone'] = $dbChecks['user_preferences_exists']
                ? $schema->hasColumn('user_preferences', 'timezone')
                : false;

            $dbChecks['settings_has_timezone'] = $dbChecks['settings_exists']
                ? $schema->hasColumn('settings', 'timezone')
                : false;

            // Check if all paths are OK
            $okPaths = array_reduce($pathsStatus, function ($carry, $row) {
                return $carry && $row['exists'] && $row['writable'];
            }, true);

            // Check if database schema is OK
            $okDb = true;
            if ($dbChecks['user_preferences_exists'] && !$dbChecks['user_preferences_has_timezone']) {
                $okDb = false;
            }
            if ($dbChecks['settings_exists'] && !$dbChecks['settings_has_timezone']) {
                $okDb = false;
            }

            $ok = $okPaths && $okDb;

            $payload = [
                'ok'          => $ok,
                'paths'       => $pathsStatus,
                'database'    => $dbChecks,
                'write_path'  => storage_path('app'),
                'timestamp'   => date('c'),
            ];

            $status = $ok ? Response::HTTP_OK : Response::HTTP_SERVICE_UNAVAILABLE;
            
            // Return JSON response with appropriate status code
            return response()->json($payload, $status);
        } catch (\Throwable $e) {
            log_message('error', 'Health check error: ' . $e->getMessage());
            return $this->error('Health check failed', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }
}