<?php

namespace cx_newsletter;

class messages_mapper
extends mapper
implements mapper_interface {
    public function create(database_item $target) : database_item {
        if ($target->has_id()) {
            throw $this->get_has_id_exception();
        }
        
        $converter = new messages_converter();
        $converter->load_object($target);

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

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

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

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

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

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

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

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

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

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

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

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

        $messages = [];
        $converter = new messages_converter();

        foreach ($result as $row) {
            array_push($messages, $converter->load_array($row)->get_object());
        }

        return $messages;
    }

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

        $query = new \cx_appengine\string_builder();
        $query->push('select id, title, content ');
        $query->push('from '.$this->get_tables()->messages().' ');
        $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 messages_converter();
        $converter->load_array($row);

        return $converter->get_object();
    }

    public function remove(database_item $target) : void {
        if (!$target->has_id()) {
            throw $this->get_blank_id_exception();
        }

        $repository = new campaigns_repository(
            $this->get_database(),
            $this->get_tables()
        );

        $campaigns = $repository->load_all(
            [ 'message' => $target->get_id() ]
        );

        foreach ($campaigns as $campaign) {
            $this->get_database()->delete(
                $this->get_tables()->send_log(),
                [ 'campaign' => $campaign->get_id() ]
            );

            $this->get_database()->delete(
                $this->get_tables()->campaigns(),
                [ 'id' => $campaign->get_id() ]
            );  
        }

        $result = $this->get_database()->delete(
            $this->get_tables()->messages(),
            [ 'id' => $target->get_id() ]
        );

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

    public function count(array $filters = []) : int {
        $query = new \cx_appengine\string_builder();
        $query->push('select count(id) ');
        $query->push('from '.$this->get_tables()->messages().' ');
        $query->push($this->parse_filters($filters));

        $result = $this->get_database()->get_var($query->get());

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

        return intval($result);
    }

    public function find(string $phrase, ?int $limit = null) : array {
        $columns = [
            'title' => '%'.$phrase.'%',
            'content' => '%'.$phrase.'%'
        ];

        $filters = $this->parse_filters(
            $columns, 
            filter_type::like, 
            filter_glue::single
        );

        $query = new \cx_appengine\string_builder();
        $query->push('select id, title, content ');
        $query->push('from '.$this->get_tables()->messages().' ');
        $query->push($filters); 
        $query->push($this->parse_limit($limit));

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

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

        $messages = [];
        $converter = new messages_converter();

        foreach ($result as $row) {
            array_push($messages, $converter->load_array($row)->get_object());
        }

        return $messages;
    }
}