<?php

namespace SilverStripe\Admin;

use SilverStripe\Control\HTTPRequest;
use SilverStripe\Control\HTTPResponse;
use SilverStripe\Core\Convert;
use SilverStripe\Forms\GridField\GridFieldDataColumns;
use SilverStripe\Forms\GridField\GridFieldDetailForm;
use SilverStripe\Forms\LiteralField;
use SilverStripe\Forms\Tab;
use SilverStripe\Forms\TabSet;
use SilverStripe\Forms\HiddenField;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\HeaderField;
use SilverStripe\Forms\Form;
use SilverStripe\Forms\GridField\GridFieldConfig_RecordEditor;
use SilverStripe\Forms\GridField\GridFieldButtonRow;
use SilverStripe\Forms\GridField\GridFieldExportButton;
use SilverStripe\Forms\GridField\GridField;
use SilverStripe\Security\Security;
use SilverStripe\Security\Member;
use SilverStripe\Security\Group;
use SilverStripe\Security\Permission;
use SilverStripe\Security\PermissionRole;
use SilverStripe\Security\PermissionProvider;
use SilverStripe\View\Requirements;
use SilverStripe\View\ArrayData;

/**
 * Security section of the CMS
 */
class SecurityAdmin extends LeftAndMain implements PermissionProvider
{

    private static $url_segment = 'security';

    private static $url_rule = '/$Action/$ID/$OtherID';

    private static $menu_title = 'Security';

    private static $tree_class = 'SilverStripe\\Security\\Group';

    private static $subitem_class = 'SilverStripe\\Security\\Member';

    private static $required_permission_codes = 'CMS_ACCESS_SecurityAdmin';

    private static $allowed_actions = array(
        'EditForm',
        'MemberImportForm',
        'memberimport',
        'GroupImportForm',
        'groupimport',
        'groups',
        'users',
        'roles'
    );

    /**
     * Shortcut action for setting the correct active tab.
     *
     * @param HTTPRequest $request
     * @return HTTPResponse
     */
    public function users($request)
    {
        return $this->index($request);
    }

    /**
     * Shortcut action for setting the correct active tab.
     *
     * @param HTTPRequest $request
     * @return HTTPResponse
     */
    public function groups($request)
    {
        return $this->index($request);
    }

    /**
     * Shortcut action for setting the correct active tab.
     *
     * @param HTTPRequest $request
     * @return HTTPResponse
     */
    public function roles($request)
    {
        return $this->index($request);
    }

    public function getEditForm($id = null, $fields = null)
    {
        // TODO Duplicate record fetching (see parent implementation)
        if (!$id) {
            $id = $this->currentPageID();
        }
        $form = parent::getEditForm($id);

        // TODO Duplicate record fetching (see parent implementation)
        $record = $this->getRecord($id);

        if ($record && !$record->canView()) {
            return Security::permissionFailure($this);
        }

        $memberList = GridField::create(
            'Members',
            false,
            Member::get(),
            $memberListConfig = GridFieldConfig_RecordEditor::create()
                ->addComponent(new GridFieldButtonRow('after'))
                ->addComponent(new GridFieldExportButton('buttons-after-left'))
        )->addExtraClass("members_grid");

        if ($record && method_exists($record, 'getValidator')) {
            $validator = $record->getValidator();
        } else {
            $validator = Member::singleton()->getValidator();
        }

        /** @var GridFieldDetailForm $detailForm */
        $detailForm = $memberListConfig->getComponentByType('SilverStripe\\Forms\\GridField\\GridFieldDetailForm');
        $detailForm
            ->setValidator($validator);

        $groupList = GridField::create(
            'Groups',
            false,
            Group::get(),
            GridFieldConfig_RecordEditor::create()
        );
        /** @var GridFieldDataColumns $columns */
        $columns = $groupList->getConfig()->getComponentByType('SilverStripe\\Forms\\GridField\\GridFieldDataColumns');
        $columns->setDisplayFields(array(
            'Breadcrumbs' => Group::singleton()->fieldLabel('Title')
        ));
        $columns->setFieldFormatting(array(
            'Breadcrumbs' => function ($val, $item) {
                /** @var Group $item */
                return Convert::raw2xml($item->getBreadcrumbs(' > '));
            }
        ));

        $fields = new FieldList(
            $root = new TabSet(
                'Root',
                $usersTab = new Tab(
                    'Users',
                    _t('SecurityAdmin.Users', 'Users'),
                    new LiteralField(
                        'MembersCautionText',
                        sprintf(
                            '<div class="alert alert-warning" role="alert">%s</div>',
                            _t(
                                'SecurityAdmin.MemberListCaution',
                                'Caution: Removing members from this list will remove them from all groups and the database'
                            )
                        )
                    ),
                    $memberList
                ),
                $groupsTab = new Tab(
                    'Groups',
                    singleton('SilverStripe\\Security\\Group')->i18n_plural_name(),
                    $groupList
                )
            ),
            // necessary for tree node selection in LeftAndMain.EditForm.js
            new HiddenField('ID', false, 0)
        );

        // Add import capabilities. Limit to admin since the import logic can affect assigned permissions
        if (Permission::check('ADMIN')) {
            $fields->addFieldsToTab('Root.Users', array(
                new HeaderField('ImportUsersHeader', _t('SecurityAdmin.IMPORTUSERS', 'Import users'), 3),
                new LiteralField(
                    'MemberImportFormIframe',
                    sprintf(
                        '<iframe src="%s" id="MemberImportFormIframe" width="100%%" height="330px" frameBorder="0">'
                        . '</iframe>',
                        $this->Link('memberimport')
                    )
                )
            ));
            $fields->addFieldsToTab('Root.Groups', array(
                new HeaderField('ImportGroupsHeader', _t('SecurityAdmin.IMPORTGROUPS', 'Import groups'), 3),
                new LiteralField(
                    'GroupImportFormIframe',
                    sprintf(
                        '<iframe src="%s" id="GroupImportFormIframe" width="100%%" height="330px" frameBorder="0">'
                        . '</iframe>',
                        $this->Link('groupimport')
                    )
                )
            ));
        }

        // Tab nav in CMS is rendered through separate template
        $root->setTemplate('SilverStripe\\Forms\\CMSTabSet');

        // Add roles editing interface
        $rolesTab = null;
        if (Permission::check('APPLY_ROLES')) {
            $rolesField = GridField::create(
                'Roles',
                false,
                PermissionRole::get(),
                GridFieldConfig_RecordEditor::create()
            );

            $rolesTab = $fields->findOrMakeTab('Root.Roles', _t('SecurityAdmin.TABROLES', 'Roles'));
            $rolesTab->push($rolesField);
        }

        $actionParam = $this->getRequest()->param('Action');
        if ($actionParam == 'groups') {
            $groupsTab->addExtraClass('ui-state-active');
        } elseif ($actionParam == 'users') {
            $usersTab->addExtraClass('ui-state-active');
        } elseif ($actionParam == 'roles' && $rolesTab) {
            $rolesTab->addExtraClass('ui-state-active');
        }

        $actions = new FieldList();

        $form = Form::create(
            $this,
            'EditForm',
            $fields,
            $actions
        )->setHTMLID('Form_EditForm');
        $form->addExtraClass('cms-edit-form fill-height');
        $form->setTemplate($this->getTemplatesWithSuffix('_EditForm'));
        // Tab nav in CMS is rendered through separate template
        if ($form->Fields()->hasTabSet()) {
            $form->Fields()->findOrMakeTab('Root')->setTemplate('SilverStripe\\Forms\\CMSTabSet');
        }
        $form->addExtraClass('ss-tabset cms-tabset ' . $this->BaseCSSClasses());
        $form->setAttribute('data-pjax-fragment', 'CurrentForm');

        $this->extend('updateEditForm', $form);

        return $form;
    }

    public function memberimport()
    {
        Requirements::clear();
        Requirements::javascript(FRAMEWORK_ADMIN_DIR . '/client/dist/js/vendor.js');
        Requirements::javascript(ltrim(FRAMEWORK_ADMIN_DIR . '/client/dist/js/MemberImportForm.js', '/'));
        Requirements::css(ltrim(FRAMEWORK_ADMIN_DIR . '/client/dist/styles/bundle.css', '/'));

        return $this->renderWith('BlankPage', array(
            'Form' => $this->MemberImportForm()->forTemplate(),
            'Content' => ' '
        ));
    }

    /**
     * @see SecurityAdmin_MemberImportForm
     *
     * @return Form
     */
    public function MemberImportForm()
    {
        if (!Permission::check('ADMIN')) {
            return null;
        }

        /** @var Group $group */
        $group = $this->currentPage();
        /** @skipUpgrade */
        $form = new MemberImportForm(
            $this,
            'MemberImportForm'
        );
        $form->setGroup($group);

        return $form;
    }

    public function groupimport()
    {
        Requirements::clear();
        Requirements::javascript(FRAMEWORK_ADMIN_DIR . '/client/dist/js/vendor.js');
        Requirements::javascript(ltrim(FRAMEWORK_ADMIN_DIR . '/client/dist/js/MemberImportForm.js', '/'));
        Requirements::css(ltrim(FRAMEWORK_ADMIN_DIR . '/client/dist/styles/bundle.css', '/'));

        return $this->renderWith('BlankPage', array(
            'Content' => ' ',
            'Form' => $this->GroupImportForm()->forTemplate()
        ));
    }

    /**
     * @see SecurityAdmin_MemberImportForm
     *
     * @skipUpgrade
     * @return Form
     */
    public function GroupImportForm()
    {
        if (!Permission::check('ADMIN')) {
            return null;
        }

        $form = new GroupImportForm($this, 'GroupImportForm');
        return $form;
    }

    /**
     * Disable GridFieldDetailForm backlinks for this view, as its
     */
    public function Backlink()
    {
        return false;
    }

    public function Breadcrumbs($unlinked = false)
    {
        $crumbs = parent::Breadcrumbs($unlinked);

        // Name root breadcrumb based on which record is edited,
        // which can only be determined by looking for the fieldname of the GridField.
        // Note: Titles should be same titles as tabs in RootForm().
        $params = $this->getRequest()->allParams();
        if (isset($params['FieldName'])) {
            // TODO FieldName param gets overwritten by nested GridFields,
            // so shows "Members" rather than "Groups" for the following URL:
            // admin/security/EditForm/field/Groups/item/2/ItemEditForm/field/Members/item/1/edit
            $firstCrumb = $crumbs->shift();
            if ($params['FieldName'] == 'Groups') {
                $crumbs->unshift(new ArrayData(array(
                    'Title' => Group::singleton()->i18n_plural_name(),
                    'Link' => $this->Link('groups')
                )));
            } elseif ($params['FieldName'] == 'Users') {
                $crumbs->unshift(new ArrayData(array(
                    'Title' => _t('SecurityAdmin.Users', 'Users'),
                    'Link' => $this->Link('users')
                )));
            } elseif ($params['FieldName'] == 'Roles') {
                $crumbs->unshift(new ArrayData(array(
                    'Title' => _t('SecurityAdmin.TABROLES', 'Roles'),
                    'Link' => $this->Link('roles')
                )));
            }
            $crumbs->unshift($firstCrumb);
        }

        return $crumbs;
    }

    public function providePermissions()
    {
        $title = $this->menu_title();
        return array(
            "CMS_ACCESS_SecurityAdmin" => array(
                'name' => _t('CMSMain.ACCESS', "Access to '{title}' section", array('title' => $title)),
                'category' => _t('Permission.CMS_ACCESS_CATEGORY', 'CMS Access'),
                'help' => _t(
                    'SecurityAdmin.ACCESS_HELP',
                    'Allow viewing, adding and editing users, as well as assigning permissions and roles to them.'
                )
            ),
            'EDIT_PERMISSIONS' => array(
                'name' => _t('SecurityAdmin.EDITPERMISSIONS', 'Manage permissions for groups'),
                'category' => _t('Permissions.PERMISSIONS_CATEGORY', 'Roles and access permissions'),
                'help' => _t(
                    'SecurityAdmin.EDITPERMISSIONS_HELP',
                    'Ability to edit Permissions and IP Addresses for a group.'
                    . ' Requires the "Access to \'Security\' section" permission.'
                ),
                'sort' => 0
            ),
            'APPLY_ROLES' => array(
                'name' => _t('SecurityAdmin.APPLY_ROLES', 'Apply roles to groups'),
                'category' => _t('Permissions.PERMISSIONS_CATEGORY', 'Roles and access permissions'),
                'help' => _t('SecurityAdmin.APPLY_ROLES_HELP', 'Ability to edit the roles assigned to a group.'
                    . ' Requires the "Access to \'Users\' section" permission.'),
                'sort' => 0
            )
        );
    }
}