<?php
/**
 * Shared yansongda/pay config bootstrap for WeChat / Alipay gateways.
 *
 * @package AKSRT
 */

namespace AKSRT\Payment\Gateways;

defined('ABSPATH') || exit;

use Yansongda\Pay\Pay;

/**
 * Builds Pay::config() payloads from aksrt_settings and boots the SDK.
 */
class YansongdaPayFactory {

	/**
	 * Boot Pay with a partial channel config (wechat and/or alipay).
	 *
	 * @param array<string,mixed> $channels Keys: wechat?, alipay?
	 */
	public static function boot(array $channels): void {
		$config = [
			'logger' => self::logger_config(),
			'http'   => [
				'timeout'         => 10.0,
				'connect_timeout' => 5.0,
			],
		];

		if (!empty($channels['wechat']) && is_array($channels['wechat'])) {
			$config['wechat'] = [
				'default' => $channels['wechat'],
			];
		}
		if (!empty($channels['alipay']) && is_array($channels['alipay'])) {
			$config['alipay'] = [
				'default' => $channels['alipay'],
			];
		}

		// Re-config is safe; Pay caches tenant config per process.
		Pay::config($config);
	}

	/**
	 * WeChat Pay API v3 merchant config.
	 *
	 * @return array<string,mixed>
	 */
	public static function wechat_from_settings(): array {
		$all    = self::settings();
		$notify = home_url('/wp-json/aksrt/v1/payment/wechatpay/notify');

		return [
			'mch_id'               => (string) ($all['wechat_merchantid'] ?? ''),
			'mch_secret_key'       => (string) ($all['wechat_api_v3_key'] ?? ''),
			'mch_secret_cert'      => (string) ($all['wechat_private_key_path'] ?? ''),
			'mch_public_cert_path' => (string) ($all['wechat_cert_path'] ?? ''),
			'mp_app_id'            => (string) ($all['wechat_appid'] ?? ''),
			'notify_url'           => $notify,
			'mode'                 => Pay::MODE_NORMAL,
		];
	}

	/**
	 * Alipay cert-mode config (yansongda/pay 3.x requires cert paths for SN + verify).
	 *
	 * app_secret_cert may be PEM string or file path.
	 * Cert path fields accept absolute file paths (or PEM content via get_public_cert).
	 *
	 * @return array<string,mixed>
	 */
	public static function alipay_from_settings(): array {
		$all    = self::settings();
		$notify = home_url('/wp-json/aksrt/v1/payment/alipay/notify');
		$return = home_url('/wp-json/aksrt/v1/payment/alipay/return');

		return [
			'app_id'                  => (string) ($all['alipay_appid'] ?? ''),
			'app_secret_cert'         => (string) ($all['alipay_privatekey'] ?? ''),
			'app_public_cert_path'    => (string) ($all['alipay_app_public_cert_path'] ?? ''),
			'alipay_public_cert_path' => (string) ($all['alipay_public_cert_path'] ?? ''),
			'alipay_root_cert_path'   => (string) ($all['alipay_root_cert_path'] ?? ''),
			'return_url'              => $return,
			'notify_url'              => $notify,
			'mode'                    => Pay::MODE_NORMAL,
		];
	}

	public static function boot_wechat(): void {
		self::boot(['wechat' => self::wechat_from_settings()]);
	}

	public static function boot_alipay(): void {
		self::boot(['alipay' => self::alipay_from_settings()]);
	}

	/**
	 * Convert Collection / ArrayAccess / array to plain array.
	 *
	 * @param mixed $data
	 * @return array<string,mixed>
	 */
	public static function to_array($data): array {
		if (is_array($data)) {
			return $data;
		}
		if ($data instanceof \Yansongda\Supports\Collection) {
			return $data->all();
		}
		if ($data instanceof \ArrayAccess) {
			$out = [];
			foreach ($data as $k => $v) {
				$out[$k] = is_array($v) || $v instanceof \ArrayAccess || $v instanceof \Yansongda\Supports\Collection
					? self::to_array($v)
					: $v;
			}
			return $out;
		}
		if (is_object($data) && method_exists($data, 'toArray')) {
			$arr = $data->toArray();
			return is_array($arr) ? $arr : [];
		}
		return [];
	}

	/**
	 * Nested value from array using dot path.
	 *
	 * @param array<string,mixed> $data
	 * @return mixed
	 */
	public static function dig(array $data, string $path, $default = null) {
		$cur = $data;
		foreach (explode('.', $path) as $seg) {
			if (!is_array($cur) || !array_key_exists($seg, $cur)) {
				return $default;
			}
			$cur = $cur[$seg];
		}
		return $cur;
	}

	/**
	 * Extract a redirect / payment URL from alipay web/wap response.
	 *
	 * @param mixed $result
	 */
	public static function extract_payment_url($result): string {
		if (is_string($result) && $result !== '') {
			return $result;
		}
		if ($result instanceof \Psr\Http\Message\ResponseInterface) {
			$loc = $result->getHeaderLine('Location');
			if ($loc !== '') {
				return $loc;
			}
			$body = (string) $result->getBody();
			if (preg_match('#action=[\'"]([^\'"]+)[\'"]#i', $body, $m)) {
				return html_entity_decode($m[1], ENT_QUOTES);
			}
			if (preg_match('#https?://[^\s"\'<>]+#', $body, $m)) {
				return $m[0];
			}
			// Auto-submit HTML form: callers may open as document; store empty payment_url and put HTML in payment_data.
			return '';
		}
		if (is_object($result)) {
			if (method_exists($result, 'getTargetUrl')) {
				$url = (string) $result->getTargetUrl();
				if ($url !== '') {
					return $url;
				}
			}
			if (method_exists($result, '__toString')) {
				$s = (string) $result;
				if (strpos($s, 'http') === 0) {
					return $s;
				}
			}
		}
		$arr = self::to_array($result);
		foreach (['payment_url', 'h5_url', 'code_url', 'mweb_url'] as $k) {
			if (!empty($arr[$k]) && is_string($arr[$k])) {
				return $arr[$k];
			}
		}
		return '';
	}

	/**
	 * HTML body from alipay Response (form auto-submit) when no Location header.
	 *
	 * @param mixed $result
	 */
	public static function extract_html_body($result): string {
		if ($result instanceof \Psr\Http\Message\ResponseInterface) {
			if ($result->getHeaderLine('Location') !== '') {
				return '';
			}
			return (string) $result->getBody();
		}
		return '';
	}

	/**
	 * Emit SDK success()/fail() ResponseInterface (or string) and exit.
	 *
	 * @param mixed $response
	 */
	public static function emit_response($response, string $fallback_body = 'success'): void {
		if ($response instanceof \Psr\Http\Message\ResponseInterface) {
			$status = $response->getStatusCode();
			if ($status > 0 && !headers_sent()) {
				http_response_code($status);
			}
			foreach ($response->getHeaders() as $name => $values) {
				if (strtolower((string) $name) === 'transfer-encoding') {
					continue;
				}
				foreach ($values as $value) {
					header($name . ': ' . $value, false);
				}
			}
			$body = (string) $response->getBody();
			echo $body !== '' ? $body : $fallback_body;
			exit;
		}
		if (is_string($response) && $response !== '') {
			echo $response;
			exit;
		}
		echo $fallback_body;
		exit;
	}

	/**
	 * @return array<string,mixed>
	 */
	private static function settings(): array {
		if (class_exists('\AKSRT\Settings\Settings')) {
			return \AKSRT\Settings\Settings::get_all();
		}
		return [];
	}

	/**
	 * @return array<string,mixed>
	 */
	private static function logger_config(): array {
		$enabled = defined('WP_DEBUG') && WP_DEBUG;
		$file    = '';
		if ($enabled && function_exists('wp_upload_dir')) {
			$uploads = wp_upload_dir();
			if (empty($uploads['error']) && !empty($uploads['basedir'])) {
				$dir = trailingslashit((string) $uploads['basedir']) . 'aksrt-pay';
				if (!is_dir($dir)) {
					wp_mkdir_p($dir);
				}
				$file = trailingslashit($dir) . 'pay.log';
			}
		}

		return [
			'enable'   => $enabled && $file !== '',
			'file'     => $file,
			'level'    => 'info',
			'type'     => 'single',
			'max_file' => 30,
		];
	}
}