<?php

namespace cx_newsletter;

class campaigns_repository
extends repository {
    public function create(campaign $target) : campaign {
        if ($target->has_id()) {
            throw $this->get_has_id_exception();
        }

        $converter = new campaigns_converter();
        $converter->load_object($target);

        $result = $this->get_database()->insert(
            $this->get_tables()->campaigns(),
            $converter->get_array()
        );

        if ($result === false) {
            throw $this->get_exception('create');
        }

        return $this->complete(
            new campaign($this->get_database()->insert_id)
        );
    }

    public function complete(campaign $target) : campaign { 
        if (!$target->has_id()) {
            throw $this->get_blank_id_exception();
        }

        $query = new \cx_appengine\string_builder();
        $query->push('select * ');
        $query->push('from '.$this->get_tables()->campaigns().' ');
        $query->push('where id=%d');

        $sql = $this->get_database()->prepare($query, $target->get_id());
        $row = $this->get_database()->get_row($sql, ARRAY_A);

        if ($row === null ) {
            throw $this->get_exception('complete');
        }

        $converter = new campaigns_converter();
        $converter->load_array($row);

        $target = $converter->get_object();
        
        $mapper = new messages_mapper(
            $this->get_database(),
            $this->get_tables()
        );

        $target->message = $mapper->complete($target->message);

        return $target;
    }

    public function load_all(array $filters = [], ?int $limit = null) : array {
        $query = new \cx_appengine\string_builder();
        $query->push('select * ');
        $query->push('from '.$this->get_tables()->campaigns().' ');
        $query->push($this->parse_filters($filters));
        $query->push($this->parse_limit($limit));
        $query->push('order by id desc');

        $result = $this->get_database()->get_results($query->get(), ARRAY_A);

        if ($result === null) {
            throw $this->get_exception('load_all');
        }

        $campaigns = [];
        $converter = new campaigns_converter();

        $mapper = new messages_mapper(
            $this->get_database(),
            $this->get_tables()
        );

        foreach ($result as $row) {
            $target = $converter->load_array($row)->get_object();
            $target->message = $mapper->complete($target->message);

            array_push($campaigns, $target);
        }

        return $campaigns;
    }

    public function load_next(campaign_type $type) : ?campaign {
        $converter = new campaign_type_converter();

        $filters = [];
        $filters['finalized'] = null;
        $filters['type'] = $converter->load_enum($type)->get_string();

        $nexts = $this->load_all($filters);
        
        if (empty($nexts)) {
            return null;
        }
        
        return $nexts[0];
    }

    public function save(campaign $target) : ?campaign {
        if (!$target->has_id()) {
            throw $this->get_blank_id_exception();
        }   

        $converter = new campaigns_converter();
        $converter->load_object($target);

        $condition = [];
        $condition['id'] = $target->get_id();

        $result = $this->get_database()->update(
            $this->get_tables()->campaigns(),
            $converter->get_array(),
            $condition
        );

        if ($result === false) {
            throw $this->get_exception('save');
        }

        return $this->complete($target);
    }
}