<?php
App::uses('AppModel', 'Model');

class SharingGroupOrg extends AppModel
{
    public $actsAs = array('AuditLog', 'Containable');

    public $belongsTo = array(
        'SharingGroup' => array(
                'className' => 'SharingGroup',
                'foreignKey' => 'sharing_group_id'
        ),
        'Organisation' => array(
                'className' => 'Organisation',
                'foreignKey' => 'org_id',
                //'conditions' => array('SharingGroupElement.organisation_uuid' => 'Organisation.uuid')
        )
    );

    public function beforeValidate($options = array())
    {
        $data = $this->data[$this->alias];
        $conditions = [
            'sharing_group_id' => $data['sharing_group_id'],
            'org_id' => $data['org_id'],
        ];
        if (isset($data['id'])) {
            $conditions['id !='] = $data['id'];
        }
        if ($this->hasAny($conditions)) {
            $this->log("Trying to save duplicate organisation `{$data['org_id']}` for sharing group `{$data['sharing_group_id']}. This should never happened.");
            $this->invalidate('org_id', 'The same organisation is already assigned to this sharing group.');
            return false;
        }
    }

    public function updateOrgsForSG($id, $new_orgs, $old_orgs, $user)
    {
        // Loop through all of the organisations we want to add.
        foreach ($new_orgs as $org) {
            $SgO = array(
                'sharing_group_id' => $id,
                'org_id' => $org['id'],
                'extend' => $org['extend']
            );
            $found = false;
            // If there is a match between a new org and an old org, keep the org in $found and unset it in the old org array.
            foreach ($old_orgs as $k => $old_org) {
                if ($old_org['org_id'] == $org['id']) {
                    $found = $old_orgs[$k];
                    unset($old_orgs[$k]);
                    break;
                }
            }
            // If we have not found the org previously, create a new sharing group org object.
            // Otherwise, if we have found it check whether the extended field has been altered, if not just continue without saving
            if (!$found) {
                $this->create();
                $isChange = false;
            } else {
                if ($found['extend'] == $SgO['extend']) {
                    continue;
                }
                $SgO['id'] = $found['id'];
                $isChange = true;
            }
            if ($this->save($SgO)) {
                if ($isChange) {
                    $this->loadLog()->createLogEntry($user, 'edit', 'SharingGroupOrg', $this->id, 'Sharing group (' . $id . '): Modified right to alter sharing group for organisation (' . $org['id'] . ').', ($org['extend'] ? 'Organisation (' . $org['id'] . ') can now extend the sharing group.' : 'Organisation (' . $org['id'] . ') can no longer extend the sharing group.'));
                } else {
                    $this->loadLog()->createLogEntry($user, 'add', 'SharingGroupOrg', $this->id, 'Sharing group (' . $id . '): Added organisation (' . $org['id'] . ').', 'Organisation (' . $org['id'] . ') added to Sharing group.' . ($org['extend'] ? ' Organisation (' . $org['id'] . ') can extend the sharing group.' : ''));
                }
            }
        }
        // We are left with some "old orgs" that are not in the new list. This means that they can be safely deleted.
        foreach ($old_orgs as $old_org) {
            if ($this->delete($old_org['id'])) {
                $this->loadLog()->createLogEntry($user, 'delete', 'SharingGroupOrg', $old_org['id'], 'Sharing group (' . $id . '): Removed organisation (' . $old_org['id'] . ').', 'Organisation (' . $org['id'] . ') removed from Sharing group.');
            }
        }
    }

    /**
     * Returns sharing groups IDs that are accessible by given organisation ID.
     *
     * @param int $org_id
     * @return array
     */
    public function fetchAllAuthorised($org_id)
    {
        $sgs = $this->find('column', array(
            'conditions' => array('org_id' => $org_id),
            'fields' => array('SharingGroupOrg.sharing_group_id'),
        ));
        return $sgs;
    }

    /**
     * Pass a sharing group ID and an organisation ID, returns true if it has a matching attached organisation object
     * @param int $id
     * @param int $org_id
     * @return bool
     */
    public function checkIfAuthorised($id, $org_id)
    {
        return $this->hasAny([
            'sharing_group_id' => $id,
            'org_id' => $org_id,
        ]);
    }
}