<?php
// +----------------------------------------------------------------------
// | YwxApp [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2026-2036 http://ywxapp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Author: ywxapp<admin@ywxapp.cn>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace addon\docs\controller\backend;

use addon\docs\model\DocsDoc;
use addon\docs\model\DocsProject;
use addon\docs\model\DocsVersion;
use addon\docs\service\DocSearchService;
use addon\docs\service\DocTreeService;
use ywxapp\controller\BackendBase;

/**
 * 文档版本管理
 *
 * @author ywxapp <admin@ywxapp.cn>
 */
class Version extends BackendBase
{
    /**
     * 版本列表
     */
    public function index()
    {
        $projectId = (int) $this->request->get('project_id', 0);
        $projects  = DocsProject::order('sort', 'asc')->order('id', 'asc')->select()->toArray();

        // 未指定项目时默认展示第一个项目，避免空白页
        if ($projectId <= 0 && !empty($projects)) {
            $projectId = (int) $projects[0]['id'];
        }

        $list = [];
        if ($projectId > 0) {
            $list = DocsVersion::where('project_id', $projectId)
                ->order('sort', 'asc')->order('id', 'asc')
                ->select()->toArray();

            foreach ($list as &$item) {
                $item['doc_count'] = DocsDoc::where('version_id', $item['id'])->count();
            }
            unset($item);
        }

        $this->assign('list', $list);
        $this->assign('projects', $projects);
        $this->assign('projectId', $projectId);
        return $this->fetch('version/index');
    }

    /**
     * 新增页面
     */
    public function add()
    {
        $this->assign('projects', DocsProject::order('sort', 'asc')->select()->toArray());
        $this->assign('projectId', (int) $this->request->get('project_id', 0));
        return $this->fetch('version/add');
    }

    /**
     * 保存新增
     */
    public function save()
    {
        $data = $this->collect();
        if (is_string($data)) {
            return $this->result->error($data);
        }

        $exists = DocsVersion::where('project_id', $data['project_id'])
            ->where('name', $data['name'])->find();
        if ($exists) {
            return $this->result->error('该项目下已存在同名版本');
        }

        $version = DocsVersion::create($data);
        $this->syncDefault($version);

        DocTreeService::clearCache();
        return $this->result->success(null, '添加成功');
    }

    /**
     * 编辑页面
     *
     * @param int $id 版本ID
     */
    public function edit($id = null)
    {
        $version = DocsVersion::find((int) $id);
        if (!$version) {
            return $this->result->error('版本不存在');
        }

        $this->assign('item', $version);
        $this->assign('projects', DocsProject::order('sort', 'asc')->select()->toArray());
        return $this->fetch('version/edit');
    }

    /**
     * 保存编辑
     *
     * @param int $id 版本ID
     */
    public function update($id)
    {
        $version = DocsVersion::find((int) $id);
        if (!$version) {
            return $this->result->error('版本不存在');
        }

        $data = $this->collect();
        if (is_string($data)) {
            return $this->result->error($data);
        }

        $exists = DocsVersion::where('project_id', $data['project_id'])
            ->where('name', $data['name'])
            ->where('id', '<>', $version->id)
            ->find();
        if ($exists) {
            return $this->result->error('该项目下已存在同名版本');
        }

        $version->save($data);
        $this->syncDefault($version);

        DocTreeService::clearCache();
        return $this->result->success(null, '保存成功');
    }

    /**
     * 删除版本（连同其下文档）
     *
     * @param int $id 版本ID
     */
    public function delete($id)
    {
        $id      = (int) $id;
        $version = DocsVersion::find($id);
        if (!$version) {
            return $this->result->error('版本不存在');
        }

        // 项目至少保留一个版本，否则文档将无处归属
        $left = DocsVersion::where('project_id', $version->project_id)->count();
        if ($left <= 1) {
            return $this->result->error('该项目仅剩一个版本，不能删除');
        }

        $docIds = DocsDoc::where('version_id', $id)->column('id');
        foreach ($docIds as $docId) {
            DocSearchService::remove((int) $docId);
        }

        DocsDoc::where('version_id', $id)->delete();
        $version->delete();

        DocTreeService::clearCache();
        return $this->result->success(null, '删除成功');
    }

    /**
     * 收集并校验表单数据
     *
     * @return array|string
     */
    protected function collect()
    {
        $projectId = (int) $this->request->post('project_id', 0);
        $name      = trim((string) $this->request->post('name', ''));
        $title     = trim((string) $this->request->post('title', ''));

        if ($projectId <= 0 || !DocsProject::find($projectId)) {
            return '请选择所属项目';
        }
        if ($name === '' || !preg_match('/^[A-Za-z0-9][A-Za-z0-9_\.\-]{0,19}$/', $name)) {
            return '版本标识只能包含字母数字与点划线，长度 1-20';
        }
        if ($title === '') {
            return '请填写版本名称';
        }

        return [
            'project_id' => $projectId,
            'name'       => $name,
            'title'      => $title,
            'intro'      => trim((string) $this->request->post('intro', '')),
            'is_default' => (int) $this->request->post('is_default', 0) === 1 ? 1 : 0,
            'sort'       => (int) $this->request->post('sort', 0),
            'status'     => (int) $this->request->post('status', 1) === 1 ? 1 : 0,
        ];
    }

    /**
     * 保证同项目下仅有一个默认版本，并同步项目的默认版本标识
     *
     * @param DocsVersion $version 当前版本
     * @return void
     */
    protected function syncDefault(DocsVersion $version): void
    {
        if ((int) $version->is_default !== 1) {
            return;
        }

        DocsVersion::where('project_id', $version->project_id)
            ->where('id', '<>', $version->id)
            ->update(['is_default' => 0]);

        DocsProject::where('id', $version->project_id)
            ->update(['default_version' => $version->name]);
    }
}