<?php

/*
 * This file is part of RaspiSMS.
 *
 * (c) Pierre-Lin Bonnemaison <plebwebsas@gmail.com>
 *
 * This source file is subject to the GPL-3.0 license that is bundled
 * with this source code in the file LICENSE.
 */

namespace controllers\internals;

    class Contact extends StandardController
    {
        protected $model = null;

        /**
         * Get the model for the Controller
         * @return \descartes\Model
         */
        protected function get_model () : \descartes\Model
        {
            $this->model = $this->model ?? new \models\Contact($this->bdd);
            return $this->model;
        } 

        /**
         * Return a contact for a user by a number
         * @param int $id_user : user id
         * @param string $number : Contact number
         * @return array
         */
        public function get_by_number_and_user(int $id_user, string $number)
        {
            return $this->get_model()->get_by_number_and_user($id_user, $number);
        }


        /**
         * Return a contact by his name for a user
         * @param int $id_user : User id
         * @param string $name : Contact name
         * @return array
         */
        public function get_by_name_and_user(int $id_user, string $name)
        {
            return $this->get_model()->get_by_name_and_user($id_user, $name);
        }
        
        
        /**
         * Return all contacts of a user.
         * @param int $id_user : user id
         * @return array
         */
        public function gets_for_user (int $id_user)
        {
            return $this->get_model()->gets_for_user($id_user);
        }


        /**
         * Create a new contact
         * @param int $id_user : User id
         * @param string $number : Contact number
         * @param string $name : Contact name
         * @param string $datas : Contact datas
         * @return mixed bool|int : False if cannot create contact, id of the new contact else
         */
        public function create($id_user, $number, $name, $datas)
        {
            $contact = [
                'id_user' => $id_user,
                'number' => $number,
                'name' => $name,
                'datas' => $datas,
            ];

            $result = $this->get_model()->insert($contact);
            if (!$result)
            {
                return $result;
            }

            $internal_event = new Event($this->bdd);
            $internal_event->create($id_user, 'CONTACT_ADD', 'Ajout contact : '.$name.' ('.\controllers\internals\Tool::phone_format($number).')');

            return $result;
        }


        /**
         * Update a contact
         * @param int $id_user : User id
         * @param int $id : Contact id
         * @param string $number : Contact number
         * @param string $name : Contact name
         * @param ?string $datas : Contact datas
         * @return int : number of modified rows
         */
        public function update_for_user(int $id_user, int $id, string $number, string $name, string $datas)
        {
            $contact = [
                'number' => $number,
                'name' => $name,
                'datas' => $datas,
            ];

            return $this->get_model()->update_for_user($id_user, $id, $contact);
        }


        /**
         * Import a list of contacts as csv
         * @param resource $file_handler : File handler to import contacts from
         * @param int $id_user : User id
         * @return mixed : False on error, number of inserted contacts else
         */
        public function import_csv (int $id_user, $file_handler)
        {
            if (!is_resource($file_handler))
            {
                return false;
            }

            $nb_insert = 0;

            $head = null;
            while ($line = fgetcsv($file_handler))
            {
                if ($head === null)
                {
                    $head = $line;
                    continue;
                }

                $line = array_combine($head, $line);
                if ($line === false)
                {
                    continue;
                }

                if (!isset($line['name'], $line['number']))
                {
                    continue;
                }

                $datas = [];
                foreach ($line as $key => $value)
                {
                    if ($key == 'name' || $key == 'number')
                    {
                        continue;
                    }

                    if ($value === '')
                    {
                        continue;
                    }

                    $key = mb_ereg_replace('[\W]', '', $key);
                    $datas[$key] = $value;
                }
                $datas = json_encode($datas);

                $success = $this->create($id_user, $line['number'], $line['name'], $datas);
                if ($success)
                {
                    $nb_insert ++;
                }
            }

            return $nb_insert;
        }


        /**
         * Import a list of contacts as json
         * @param resource $file_handler : File handler to import contacts from
         * @param int $id_user : User id
         * @return mixed : False on error, number of inserted contacts else
         */
        public function import_json (int $id_user, $file_handler)
        {
            if (!is_resource($file_handler))
            {
                return false;
            }

            $file_content = '';
            while ($line = fgets($file_handler))
            {
                $file_content .= $line;
            }

            try
            {
                $contacts = json_decode($file_content, true);

                if (!is_array($contacts))
                {
                    return false;
                }

                $nb_insert = 0;
                foreach ($contacts as $contact)
                {
                    if (!is_array($contact))
                    {
                        continue;
                    }

                    if (!isset($contact['name'], $contact['number']))
                    {
                        continue;
                    }

                    $datas = $contact['datas'] ?? [];
                    $datas = json_encode($datas);
                    
                    $success = $this->create($id_user, $contact['number'], $contact['name'], $datas);
                    if ($success)
                    {
                        $nb_insert ++;
                    }
                }

                return $nb_insert;
            }
            catch (\Exception $e)
            {
                return false;
            }
        }
        
        
        /**
         * Export the contacts of a user as csv
         * @param int $id_user : User id
         * @return array : ['headers' => array of headers to return, 'content' => the generated file]
         */
        public function export_csv (int $id_user) : array
        {
            $contacts = $this->get_model()->gets_for_user($id_user);

            $columns = [
                'name',
                'number',
            ];

            foreach ($contacts as $contact)
            {
                $datas = json_decode($contact['datas'], true);
                foreach ($datas as $key => $value)
                {
                    $columns[] = $key;        
                }
            }
            $columns = array_unique($columns);

            $lines = [];
            foreach ($contacts as $contact)
            {
                $datas = json_decode($contact['datas'], true);

                $line = [];
                foreach ($columns as $column)
                {
                    if (isset($contact[$column]))
                    {
                        $line[] = $contact[$column];
                        continue;
                    }

                    if (isset($datas[$column]))
                    {
                        $line[] = $datas[$column];
                        continue;
                    }

                    $line[] = null;
                }
                $lines[] = $line;
            }

            //Php only support csv formatting to file. To get it in string we need to create a tmp in memory file, write in it, and then read the file into a var
            // output up to 5MB is kept in memory, if it becomes bigger it will automatically be written to a temporary file
            $csv_tmp_file = fopen('php://temp/maxmemory:'. (5*1024*1024), 'r+');
            fputcsv($csv_tmp_file, $columns);
            foreach ($lines as $line)
            {
                fputcsv($csv_tmp_file, $line);
            }
            rewind($csv_tmp_file);

            $csv_string = stream_get_contents($csv_tmp_file);

            return [
                'headers' => [
                    'Content-Disposition: attachment; filename=contacts.csv',
                    'Content-Type: text/csv',
                    'Content-Length: ' . strlen($csv_string),
                ],
                'content' => $csv_string,
            ];
        }
        
        
        /**
         * Export the contacts of a user as json
         * @param int $id_user : User id
         * @return array : ['headers' => array of headers to return, 'content' => the generated file]
         */
        public function export_json (int $id_user) : array
        {
            $contacts = $this->get_model()->gets_for_user($id_user);

            foreach ($contacts as &$contact)
            {
                unset($contact['id']);
                unset($contact['id_user']);
                $contact['datas'] = json_decode($contact['datas']);
            }
            $content = json_encode($contacts);

            return [
                'headers' => [
                    'Content-Disposition: attachment; filename=contacts.json',
                    'Content-Type: application/json',
                    'Content-Length: ' . strlen($content),
                ],
                'content' => $content,
            ];
        }
        
    }