<?php namespace App\Controllers;

use App\Controllers\BaseController;
use CodeIgniter\Exceptions\PageNotFoundException;

class SwaggerController extends BaseController
{
    public function index()
    {
        return view('swagger/index', [
            'specUrl' => base_url('assets/api.yaml'),
            'pageTitle' => 'Swagger UI',
            'swaggerPreauthorize' => [],
        ]);
    }

    /**
     * Swagger UI for TPA external integrations OpenAPI spec (openapi/tpa-external-integrations.yaml).
     * Pre-fills Authorize from the same `.env` keys the API controllers use (`getenv`).
     */
    public function tpa()
    {
        return view('swagger/index', [
            'specUrl' => base_url('swagger/tpa-spec'),
            'pageTitle' => 'TPA external APIs — Swagger UI',
            'swaggerPreauthorize' => $this->buildTpaSwaggerPreauthorize(),
        ]);
    }

    /**
     * Values for Swagger UI Authorize (apiKey / basic). Uses runtime env — keep `/swagger/tpa` access-controlled.
     *
     * @return list<array<string, string>>
     */
    protected function buildTpaSwaggerPreauthorize(): array
    {
        return [
            ['kind' => 'apiKey', 'scheme' => 'MediAssistUsername', 'value' => $this->readEnvString('MEDI_ASSIST_API_USERNAME')],
            ['kind' => 'apiKey', 'scheme' => 'MediAssistPassword', 'value' => $this->readEnvString('MEDI_ASSIST_API_PASSWORD')],
            ['kind' => 'apiKey', 'scheme' => 'VidalSubscriptionKey', 'value' => $this->readEnvString('VIDAL_API_SUBSCRIPTION_KEY')],
            ['kind' => 'apiKey', 'scheme' => 'VidalIrSubscriptionKey', 'value' => $this->readEnvString('VIDAL_SUBSCRIPTION_KEY')],
            ['kind' => 'apiKey', 'scheme' => 'VidalWellnessSubscriptionKey', 'value' => $this->readEnvString('VIDAL_WELLNESS_SUBSCRIPTION_KEY')],
            [
                'kind' => 'basic',
                'scheme' => 'HealthIndiaTokenBasic',
                'username' => $this->readEnvString('HEALTH_INDIA_USERNAME'),
                'password' => $this->readEnvString('HEALTH_INDIA_PASSWORD'),
            ],
        ];
    }

    /**
     * Read `.env` the same way as the rest of CodeIgniter (`env()` then `getenv()`).
     */
    protected function readEnvString(string $key): string
    {
        if (function_exists('env')) {
            $v = \env($key);
            if ($v !== null) {
                return \is_bool($v) ? '' : (string) $v;
            }
        }

        $g = \getenv($key);

        return $g === false ? '' : (string) $g;
    }

    /**
     * Serves the OpenAPI YAML from project root /openapi (not under public/).
     */
    public function tpaSpec()
    {
        $path = ROOTPATH . 'openapi/tpa-external-integrations.yaml';
        if (! is_readable($path)) {
            throw PageNotFoundException::forPageNotFound('OpenAPI spec not found.');
        }

        return $this->response
            ->setHeader('Content-Type', 'application/yaml; charset=UTF-8')
            ->setHeader('Cache-Control', 'public, max-age=300')
            ->setBody(file_get_contents($path));
    }
}