<?php
/** Manual identity application flow. @package AKSRT */

namespace AKSRT\Identity;

defined('ABSPATH') || exit;

final class ApplicationService {

	private ApplicationRepository $applications;
	private EvidenceService $evidence;

	public function __construct(?ApplicationRepository $applications = null, ?EvidenceService $evidence = null) {
		$this->applications = $applications ?? new ApplicationRepository();
		$this->evidence = $evidence ?? new EvidenceService();
	}

	/** @return array<string,mixed>|\WP_Error */
	public function create(int $user_id, array $input, $files = null) {
		$settings = \AKSRT\User\AuthApply::settings();
		if (empty($settings['enabled']) || empty($settings['allow_apply'])) {
			return new \WP_Error('aksrt_identity_disabled', __('暂不能申请身份认证', 'aksrt'), ['status' => 403]);
		}
		if (\AKSRT\User\AuthApply::is_verified($user_id)) {
			return new \WP_Error('aksrt_identity_verified', __('您已是认证用户', 'aksrt'), ['status' => 409]);
		}
		if ($this->applications->active_for_user($user_id)) {
			return new \WP_Error('aksrt_identity_active', __('您的申请已提交，请耐心等待', 'aksrt'), ['status' => 409]);
		}
		$minimum_level = max(0, (int) ($settings['minimum_level'] ?? 0));
		$identity_settings = class_exists('AKSRT\\Settings\\Settings')
			? \AKSRT\Settings\Settings::get_user_identity_settings()
			: [];
		$level_enabled = !isset($identity_settings['level']['enabled']) || !empty($identity_settings['level']['enabled']);
		if (!\AKSRT\User\AuthApply::meets_minimum_level($user_id, $minimum_level, $level_enabled)) {
			return new \WP_Error('aksrt_identity_level', __('当前等级暂不能申请身份认证', 'aksrt'), ['status' => 403]);
		}

		$name = sanitize_text_field((string) ($input['name'] ?? ''));
		$description = sanitize_textarea_field((string) ($input['description'] ?? ''));
		$message = sanitize_textarea_field((string) ($input['message'] ?? ''));
		if ($this->length($name) < 4 || $this->length($name) > 16) {
			return new \WP_Error('aksrt_identity_name', __('认证名称不能少于 4 个或超过 16 个字符', 'aksrt'));
		}

		$uuid = wp_generate_uuid4();
		$evidence_ids = [];
		if ($files !== null) {
			$evidence_ids = $this->evidence->upload($user_id, $uuid, $files);
			if (is_wp_error($evidence_ids)) {
				return $evidence_ids;
			}
		}
		$created = $this->applications->create([
			'application_uuid' => $uuid,
			'client_request_id' => wp_generate_uuid4(),
			'request_payload_hash' => hash('sha256', wp_json_encode([$name, $description, $message])),
			'user_id' => $user_id,
			'type' => 'general',
			'channel' => 'manual',
			'status' => 'manual_pending',
			'public_name' => $name,
			'description' => $description,
			'manual_reason' => $message,
			'evidence_ids' => wp_json_encode(array_map('absint', $evidence_ids)),
		]);
		if (is_wp_error($created)) {
			$this->evidence->delete($evidence_ids);
			return $created;
		}
		(new EventRepository())->record([
			'application_id' => (int) $created['id'],
			'source' => 'user',
			'event_type' => 'application_submitted',
			'dedupe_key' => hash('sha256', $uuid . '|submitted'),
			'to_status' => 'manual_pending',
			'actor_user_id' => $user_id,
			'summary' => ['name' => $name],
		]);
		if (class_exists('AKSRT\\Settings\\MailNotifications')) {
			\AKSRT\Settings\MailNotifications::auth_submitted($user_id, $created);
		}
		return $this->view($created);
	}

	/** @return array<string,mixed> */
	private function view(array $application): array {
		$items = [];
		foreach ($this->evidence->items($application) as $item) {
			$items[] = ['url' => $item['url'], 'thumbnail_url' => $item['thumbnail_url']];
		}
		return [
			'uuid' => (string) ($application['application_uuid'] ?? ''),
			'status' => TransitionService::public_status((string) ($application['status'] ?? '')),
			'name' => (string) ($application['public_name'] ?? ''),
			'description' => (string) ($application['description'] ?? ''),
			'message' => (string) ($application['manual_reason'] ?? ''),
			'admin_note' => (string) ($application['review_note'] ?? ''),
			'time' => (string) ($application['created_at'] ?? ''),
			'evidence' => $items,
		];
	}

	private function length(string $value): int {
		if (function_exists('mb_strlen')) {
			return mb_strlen($value);
		}
		$count = preg_match_all('/./us', $value, $matches);
		return $count === false ? strlen($value) : $count;
	}
}