<?php

namespace App\Support;

use App\Models\SmsVerification;
use RuntimeException;

class SmsConfig
{
    /** @return array<string, string> */
    public static function realSendingRequiredEnv(): array
    {
        return match (self::driver()) {
            'submail' => self::submailRequiredEnv(),
            default => self::tencentCloudRequiredEnv(),
        };
    }

    /** @return array<string, string> */
    public static function tencentCloudRequiredEnv(): array
    {
        return [
            'sms.tencentcloud.endpoint' => 'TENCENT_SMS_ENDPOINT',
            'sms.tencentcloud.sdk_app_id' => 'TENCENT_SMS_SDK_APP_ID',
            'sms.tencentcloud.app_key' => 'TENCENT_SMS_APP_KEY',
            'sms.tencentcloud.sign_name' => 'TENCENT_SMS_SIGN_NAME',
            'sms.tencentcloud.template_id' => 'TENCENT_SMS_TEMPLATE_ID',
        ];
    }

    /** @return array<string, string> */
    public static function submailRequiredEnv(): array
    {
        return [
            'sms.submail.endpoint' => 'SUBMAIL_SMS_ENDPOINT',
            'sms.submail.app_id' => 'SUBMAIL_APP_ID',
            'sms.submail.app_key' => 'SUBMAIL_APP_KEY',
            'sms.submail.sign_name' => 'SUBMAIL_SMS_SIGN_NAME',
            'sms.submail.login_template_id' => 'SUBMAIL_LOGIN_TEMPLATE_ID',
        ];
    }

    public static function driver(): string
    {
        $driver = trim((string) config('sms.driver', 'submail'));

        return $driver !== '' ? $driver : 'submail';
    }

    public static function activeProvider(): string
    {
        if (! (bool) config('sms.enabled')) {
            return SmsVerification::PROVIDER_DISABLED;
        }

        return self::driver() === 'tencentcloud'
            ? SmsVerification::PROVIDER_TENCENTCLOUD
            : SmsVerification::PROVIDER_SUBMAIL;
    }

    public static function activeLoginTemplateId(): string
    {
        return self::driver() === 'tencentcloud'
            ? (string) config('sms.tencentcloud.template_id')
            : (string) config('sms.submail.login_template_id');
    }

    public static function activeSignName(): string
    {
        return self::driver() === 'tencentcloud'
            ? (string) config('sms.tencentcloud.sign_name')
            : (string) config('sms.submail.sign_name');
    }

    public static function assertReadyForRealSending(): void
    {
        if (! (bool) config('sms.enabled')) {
            return;
        }

        $driver = self::driver();
        if ($driver === 'submail') {
            self::assertKeysPresent(self::submailRequiredEnv(), 'Submail SMS configuration is incomplete.');

            return;
        }

        if ($driver !== 'tencentcloud') {
            throw new RuntimeException('SMS_ENABLED=true requires SMS_DRIVER=submail or tencentcloud.');
        }

        $missing = [];
        foreach (self::tencentCloudRequiredEnv() as $configKey => $envName) {
            $value = config($configKey);
            if ($value === null || trim((string) $value) === '') {
                $missing[] = $envName;
            }
        }

        if ((int) config('sms.tencentcloud.template_param_count') !== 2) {
            $missing[] = 'TENCENT_SMS_TEMPLATE_PARAM_COUNT must be 2';
        }

        if ($missing !== []) {
            throw new RuntimeException(
                'SMS_ENABLED=true but Tencent Cloud SMS configuration is incomplete. '
                .'The legacy application API requires SDKAppID and App Key. Missing or invalid: '
                .implode(', ', $missing)
            );
        }
    }

    /**
     * @param  array<string, string>  $map
     */
    private static function assertKeysPresent(array $map, string $prefix): void
    {
        $missing = [];
        foreach ($map as $configKey => $envName) {
            $value = config($configKey);
            if ($value === null || trim((string) $value) === '') {
                $missing[] = $envName;
            }
        }
        if ($missing !== []) {
            throw new RuntimeException($prefix.' Missing or invalid: '.implode(', ', $missing));
        }
    }
}