<?php

namespace Jio\Forum;

defined('ABSPATH') || exit;

trait RestPosts {
	public static function create_post(\WP_REST_Request $request) {
		return self::save_post($request, 0);
	}

	public static function update_post(\WP_REST_Request $request) {
		return self::save_post($request, absint($request['id']));
	}

	private static function save_post(\WP_REST_Request $request, int $id) {
		$user_id = self::actor();
		$current = $id > 0 ? self::post($id) : null;
		if ($id > 0 && (!$current || !Access::can_manage_post($user_id, $id))) {
			return self::fail('无权编辑此帖子', 403);
		}
		$input = self::input($request);
		$plate_id = absint($input['plate_id'] ?? ($current ? get_post_meta($id, '_jio_forum_plate_id', true) : 0));
		if (!self::plate($plate_id) || !Access::can_publish($user_id, $plate_id)) {
			return self::fail('没有在此版块发布的权限', 403);
		}
		if ($id === 0 && !Access::is_moderator($user_id, $plate_id)) {
			$limit = max(0, (int) jio_get_setting('jio_forum_daily_post_limit', 20));
			if ($limit > 0) {
				$recent = get_posts(['post_type' => Core::POST, 'post_status' => ['publish', 'pending'], 'author' => $user_id, 'date_query' => [['after' => 'today']], 'posts_per_page' => $limit, 'fields' => 'ids']);
				if (count($recent) >= $limit) {
					return self::fail('已达到今日发帖上限', 429);
				}
			}
		}
		$title = sanitize_text_field((string) ($input['title'] ?? ($current->post_title ?? '')));
		$content = wp_kses_post((string) ($input['content'] ?? ($current->post_content ?? '')));
		if (mb_strlen($title) < 2 || mb_strlen($title) > 120 || trim(wp_strip_all_tags($content)) === '') {
			return self::fail('请填写标题和正文');
		}
		$type = sanitize_key((string) ($input['type'] ?? ($current ? get_post_meta($id, '_jio_forum_type', true) : 'normal')));
		if (!in_array($type, ['normal', 'question', 'vote'], true)) {
			return self::fail('帖子类型无效');
		}
		if (($type === 'vote' && !jio_get_setting('jio_forum_vote_enabled', true)) || ($type === 'question' && !jio_get_setting('jio_forum_question_enabled', true))) {
			return self::fail('当前未启用此帖子类型');
		}
		$votes = [];
		$vote_type = 'single';
		$vote_title = '';
		$vote_days = 0;
		if ($type === 'vote') {
			$vote_type = sanitize_key((string) ($input['vote_type'] ?? ($current ? get_post_meta($id, '_jio_forum_vote_type', true) : 'single')));
			if ($vote_type === '') $vote_type = 'single';
			if (!in_array($vote_type, ['single', 'multiple', 'pk'], true)) return self::fail('投票方式无效');
			$vote_title = sanitize_text_field((string) ($input['vote_title'] ?? ($current ? get_post_meta($id, '_jio_forum_vote_title', true) : '')));
			if (mb_strlen($vote_title) > 60) return self::fail('投票标题过长');
			$vote_days = absint($input['vote_days'] ?? 0);
			if (!in_array($vote_days, [0, 1, 7, 30], true)) return self::fail('投票有效期无效');
			$raw = (string) ($input['vote_options'] ?? '');
			if ($raw === '' && $current) {
				$votes = (array) get_post_meta($id, '_jio_forum_vote_options', true);
			} else {
				$votes = array_values(array_unique(array_filter(array_map('sanitize_text_field', preg_split('/\R/', $raw)))));
			}
			$max_votes = max(2, min(20, (int) jio_get_setting('jio_forum_vote_max', 10)));
			if (count($votes) < 2 || count($votes) > $max_votes) {
				return self::fail('投票选项数量无效');
			}
			if ($vote_type === 'pk' && count($votes) !== 2) return self::fail('双选 PK 只能有两个选项');
			if ($current && get_post_meta($id, '_jio_forum_vote_total', true) && $votes !== (array) get_post_meta($id, '_jio_forum_vote_options', true)) {
				return self::fail('已有投票后不能更改选项');
			}
			if ($current && get_post_meta($id, '_jio_forum_vote_total', true) && $vote_type !== (string) get_post_meta($id, '_jio_forum_vote_type', true)) {
				return self::fail('已有投票后不能更改投票方式');
			}
		}
		$view = sanitize_key((string) ($input['view_limit'] ?? ($current ? get_post_meta($id, '_jio_forum_view_limit', true) : 'all')));
		if (!in_array($view, ['all', 'login', 'follow', 'points', 'pay'], true)) {
			return self::fail('访问权限无效');
		}
		if (($view === 'points' && !jio_get_setting('jio_forum_points_enabled', true)) || ($view === 'pay' && !jio_get_setting('jio_forum_paid_content', true))) {
			return self::fail('当前未启用此解锁方式');
		}
		$price = (string) ($input['price'] ?? ($current ? get_post_meta($id, '_jio_forum_price', true) : '0'));
		if (($view === 'points' && (!ctype_digit($price) || (int) $price <= 0)) || ($view === 'pay' && !preg_match('/^(0|[1-9]\d*)(?:\.\d{1,2})?$/', $price))) {
			return self::fail('解锁价格无效');
		}
		if (in_array($view, ['points', 'pay'], true)) {
			$valid_price = self::validate_price($price, $view);
			if (is_wp_error($valid_price)) return $valid_price;
			foreach (['vip1', 'vip2'] as $vip) {
				if (!isset($input['price_' . $vip]) || $input['price_' . $vip] === '') continue;
				$valid_price = self::validate_price((string) $input['price_' . $vip], $view);
				if (is_wp_error($valid_price)) return $valid_price;
			}
		}
		if (isset($input['topics']) && !jio_get_setting('jio_forum_user_topics', true) && !Access::is_admin($user_id)) {
			foreach (array_filter(array_map('sanitize_text_field', explode(',', (string) $input['topics']))) as $name) {
				if (!term_exists($name, Core::TOPIC)) return self::fail('无权创建新话题', 403);
			}
		}
		if ($current && (int) get_post_meta($id, '_jio_forum_vote_total', true) > 0 && $type !== 'vote') {
			return self::fail('已有投票后不能更改帖子类型');
		}
		if ($current && get_post_meta($id, '_jio_forum_adopted_comment', true) && $type !== 'question') {
			return self::fail('已有采纳回复后不能更改帖子类型');
		}
		$status = Access::is_moderator($user_id, $plate_id) || !jio_get_setting('jio_forum_post_review', true) ? 'publish' : 'pending';
		$post_data = [
			'ID' => $id, 'post_type' => Core::POST, 'post_title' => $title, 'post_content' => $content,
			'post_status' => $status, 'post_author' => $current ? (int) $current->post_author : $user_id,
			'comment_status' => $current ? $current->comment_status : 'open', 'ping_status' => 'closed',
		];
		$result = $id ? wp_update_post($post_data, true) : wp_insert_post($post_data, true);
		if (is_wp_error($result) || !$result) {
			return self::fail('保存失败', 500);
		}
		$id = (int) $result;
		if (class_exists('\\Jio\\Attachment\\PendingUploads')) {
			\Jio\Attachment\PendingUploads::claim_text($content, $user_id);
		}
		update_post_meta($id, '_jio_forum_plate_id', $plate_id);
		update_post_meta($id, '_jio_forum_type', $type);
		update_post_meta($id, '_jio_forum_view_limit', $view);
		update_post_meta($id, '_jio_forum_price', $price);
		foreach (['vip1', 'vip2'] as $vip) {
			if (!isset($input['price_' . $vip])) continue;
			$vip_price = (string) $input['price_' . $vip];
			if ($vip_price === '' || preg_match($view === 'points' ? '/^\d+$/' : '/^(0|[1-9]\d*)(?:\.\d{1,2})?$/', $vip_price)) {
				update_post_meta($id, '_jio_forum_price_' . $vip, $vip_price);
			}
		}
		if ($type === 'vote') {
			update_post_meta($id, '_jio_forum_vote_options', $votes);
			update_post_meta($id, '_jio_forum_vote_type', $vote_type);
			update_post_meta($id, '_jio_forum_vote_title', $vote_title);
			if (!$current || !get_post_meta($id, '_jio_forum_vote_started', true)) {
				$started = current_time('timestamp');
				update_post_meta($id, '_jio_forum_vote_started', $started);
				update_post_meta($id, '_jio_forum_vote_deadline', $vote_days ? $started + $vote_days * DAY_IN_SECONDS : 0);
			}
		}
		foreach ([Core::TOPIC => 'topics', Core::TAG => 'tags'] as $taxonomy => $key) {
			if (isset($input[$key])) {
				$names = array_values(array_filter(array_map('sanitize_text_field', explode(',', (string) $input[$key]))));
				wp_set_object_terms($id, $names, $taxonomy);
			}
		}
		do_action($current ? 'jio_forum_post_updated' : 'jio_forum_post_created', $id, $user_id, $status);
		return self::success(['id' => $id, 'url' => $status === 'pending' ? Core::edit_url($id) : get_permalink($id), 'status' => $status], $status === 'pending' ? '已提交审核' : '帖子已发布');
	}

	public static function create_plate(\WP_REST_Request $request) {
		return self::save_plate($request, 0);
	}

	public static function update_plate(\WP_REST_Request $request) {
		return self::save_plate($request, absint($request['id']));
	}

	private static function save_plate(\WP_REST_Request $request, int $id) {
		$user_id = self::actor();
		$current = $id > 0 ? self::plate($id) : null;
		if ($id > 0 && (!$current || !Access::is_moderator($user_id, $id))) {
			return self::fail('无权编辑版块', 403);
		}
		if ($id === 0 && !Access::is_admin($user_id) && !jio_get_setting('jio_forum_user_plates', true)) {
			return self::fail('当前不允许创建版块', 403);
		}
		$input = self::input($request);
		$title = sanitize_text_field((string) ($input['title'] ?? ($current->post_title ?? '')));
		if (mb_strlen($title) < 2 || mb_strlen($title) > 80) {
			return self::fail('版块名称需为 2 至 80 个字符');
		}
		$follow_mode = sanitize_key((string) ($input['follow_mode'] ?? ($current ? get_post_meta($id, '_jio_forum_follow_mode', true) : 'all')));
		$view_limit = sanitize_key((string) ($input['view_limit'] ?? ($current ? get_post_meta($id, '_jio_forum_view_limit', true) : 'all')));
		if (!in_array($follow_mode, ['all', 'points', 'pay'], true) || !in_array($view_limit, ['all', 'login', 'follow', 'points', 'pay'], true)) {
			return self::fail('版块权限无效');
		}
		if (in_array($follow_mode, ['points', 'pay'], true) && !jio_get_setting('jio_forum_paid_follow', true)) {
			return self::fail('付费关注未启用');
		}
		if (($follow_mode === 'points' || $view_limit === 'points') && !jio_get_setting('jio_forum_points_enabled', true)) {
			return self::fail('积分解锁未启用');
		}
		$follow_price = (string) ($input['follow_price'] ?? ($current ? get_post_meta($id, '_jio_forum_follow_price', true) : '0'));
		if ($follow_price === '') $follow_price = '0';
		if (!preg_match($follow_mode === 'points' ? '/^\d+$/' : '/^(0|[1-9]\d*)(?:\.\d{1,2})?$/', $follow_price)) {
			return self::fail('关注价格无效');
		}
		if (in_array($follow_mode, ['points', 'pay'], true)) {
			$valid_price = self::validate_price($follow_price, $follow_mode);
			if (is_wp_error($valid_price)) return $valid_price;
			foreach (['vip1', 'vip2'] as $vip) {
				if (!isset($input['follow_price_' . $vip]) || $input['follow_price_' . $vip] === '') continue;
				$valid_price = self::validate_price((string) $input['follow_price_' . $vip], $follow_mode);
				if (is_wp_error($valid_price)) return $valid_price;
			}
		}
		$status = Access::is_admin($user_id) || !jio_get_setting('jio_forum_plate_review', true) ? 'publish' : 'pending';
		$result = $id ? wp_update_post([
			'ID' => $id, 'post_title' => $title,
			'post_content' => wp_kses_post((string) ($input['content'] ?? $current->post_content)),
		], true) : wp_insert_post([
			'post_type' => Core::PLATE, 'post_title' => $title, 'post_status' => $status,
			'post_author' => $user_id, 'post_content' => wp_kses_post((string) ($input['content'] ?? '')),
		], true);
		if (is_wp_error($result) || !$result) {
			return self::fail('版块保存失败', 500);
		}
		$id = (int) $result;
		if (isset($input['category_id'])) {
			$term_id = absint($input['category_id']);
			if ($term_id && term_exists($term_id, Core::CATEGORY)) {
				wp_set_object_terms($id, [$term_id], Core::CATEGORY);
			}
		}
		if (Access::is_moderator($user_id, $id) && isset($input['publish_limit'])) {
			$limit = sanitize_key((string) $input['publish_limit']);
			if (in_array($limit, ['all', 'follow'], true)) {
				update_post_meta($id, '_jio_forum_publish_limit', $limit);
			}
		}
		update_post_meta($id, '_jio_forum_follow_mode', $follow_mode);
		update_post_meta($id, '_jio_forum_follow_price', $follow_price);
		update_post_meta($id, '_jio_forum_view_limit', $view_limit);
		foreach (['vip1', 'vip2'] as $vip) {
			if (!isset($input['follow_price_' . $vip])) continue;
			$vip_price = (string) $input['follow_price_' . $vip];
			if ($vip_price === '' || preg_match($follow_mode === 'points' ? '/^\d+$/' : '/^(0|[1-9]\d*)(?:\.\d{1,2})?$/', $vip_price)) {
				update_post_meta($id, '_jio_forum_follow_price_' . $vip, $vip_price);
			}
		}
		return self::success(['id' => $id, 'url' => get_post_status($id) === 'publish' ? get_permalink($id) : Core::home_url(), 'status' => get_post_status($id)], get_post_status($id) === 'pending' ? '版块已提交审核' : '版块已保存');
	}

	private static function validate_price(string $value, string $mode) {
		if ($mode === 'points') {
			$max = (string) PHP_INT_MAX;
			return preg_match('/^(0|[1-9]\d*)$/', $value) && (strlen($value) < strlen($max) || strlen($value) === strlen($max) && strcmp($value, $max) <= 0)
				? true : self::fail('积分价格超出范围');
		}
		try {
			\Jio\Ledger\AssetAmount::balance($value);
			return true;
		} catch (\InvalidArgumentException $exception) {
			return self::fail('付费价格超出范围');
		}
	}
}