<?php

// (c) Copyright by authors of the Tiki Wiki CMS Groupware Project
//
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
// $Id$

class Perms_Builder
{
    private $prefix = 'tiki_p_';

    private $categories = false;
    private $definitions = [];
    private $adminPermissionMap = [];
    private $globalOnlyPermissions = [];

    public function build()
    {
        $alternateCheck = new Perms_Check_Alternate('admin');
        $fixedCheck = new Perms_Check_Fixed($this->globalOnlyPermissions);

        $perms = new Perms();
        $perms->setPrefix($this->prefix);
        $perms->setCheckSequence($this->getSequence($alternateCheck, $fixedCheck));
        $perms->setResolverFactories($this->getFactories());

        $accessor = $perms->getAccessor([]);
        $alternateCheck->setResolver($accessor->getResolver());
        $fixedCheck->setResolver($accessor->getResolver());

        return $perms;
    }

    public function withCategories($with = true)
    {
        $this->categories = (bool) $with;
        return $this;
    }

    public function withDefinitions($definitions = [])
    {
        $this->definitions = $definitions;

        $adminPermissions = [];

        foreach ($definitions as $row) {
            $permName = $row['name'];
            if ($row['admin']) {
                $adminPermissions[ $row['type'] ] = substr($permName, strlen($this->prefix));
            }
        }

        // Create a map from the permission to the admin permission
        foreach ($definitions as $row) {
            $permName = $row['name'];
            $type = $row['type'];
            if (isset($adminPermissions[$type]) && ! $row['admin']) {
                $permName = substr($permName, strlen($this->prefix));
                $this->adminPermissionMap[$permName] = $adminPermissions[$type];
            }
        }

        foreach ($definitions as $row) {
            if ($row['scope'] == 'global') {
                $this->globalOnlyPermissions[] = substr($row['name'], strlen($this->prefix));
            }
        }

        return $this;
    }

    private function getSequence($alternate, $fixed)
    {
        $args = func_get_args();

        $args[] = new Perms_Check_Direct();
        $args[] = new Perms_Check_Indirect($this->adminPermissionMap);

        return $args;
    }

    private function getFactories()
    {
        $factories = [
            new Perms_ResolverFactory_ObjectFactory()
        ];

        if ($this->categories) {
            $factories[] = new Perms_ResolverFactory_CategoryFactory();
        }

        $factories[] = new Perms_ResolverFactory_ObjectFactory('parent');

        if ($this->categories) {
            $factories[] = new Perms_ResolverFactory_CategoryFactory('parent');
        }

        $factories[] = new Perms_ResolverFactory_GlobalFactory();

        return $factories;
    }
}