<?php

namespace cx_newsletter;
use \exception;

class database_installer
extends database_builder
implements database_builder_interface {
    public function clean() : self {
        $this->drop_table($this->get_tables()->send_log());
        $this->drop_table($this->get_tables()->campaigns());
        $this->drop_table($this->get_tables()->customers());
        $this->drop_table($this->get_tables()->messages());
        $this->drop_table($this->get_tables()->groups());

        $this->get_versions()->set_installed(null);

        return $this;
    }

    public function update() : self {
        while (true) {
            if ($this->increase_version() === false) {
                return $this;
            }
        }
    }

    private function increase_version() : bool {
        $version = $this->get_versions()->get_installed();

        if ($version === null) {
            $this->init();
            return true;
        }

        if ($version === 1) {
            $this->from_first_to_second();
            return true;
        }

        if ($version === 2) {
            return false;
        }
    }

    private function from_first_to_second() : void {
        $this->create_table($this->get_tables()->groups(), [
            'id' => 'int auto_increment not null primary key',
            'name' => 'char(128)'
        ]);

        $this->add_column(
            $this->get_tables()->customers(),
            'grouped', 
            'int null default null' 
        );

        $this->add_foreign_key(
            $this->get_tables()->customers(),
            'grouped',
            $this->get_tables()->groups(),
            'id'
        );

        $this->add_column(
            $this->get_tables()->campaigns(),
            'grouped',
            'int null default null'
        );

        $this->add_foreign_key(
            $this->get_tables()->campaigns(),
            'grouped',
            $this->get_tables()->groups(),
            'id'
        );  

        $this->get_versions()->set_installed(2);
    }

    public function init() : self {
        if ($this->get_versions()->get_installed() !== null) {
            $error = 'Can not initialize currently initialized database. ';
            $error .= 'Clean it first.';

            throw new exception($error);
        }

        $this->create_table($this->get_tables()->customers(), [
            'id' => 'int auto_increment not null primary key',
            'company' => 'char(128)',
            'name' => 'char(64)',
            'surname' => 'char(64)',
            'comments' => 'char(255)',
            'email' => 'char(64)',
            'phone_number' => 'char(12)',
            'tester' => 'bool',
        ]);

        $this->create_table($this->get_tables()->messages(), [
            'id' => 'int auto_increment not null primary key',
            'title' => 'char(128)',
            'content' => 'text'
        ]);

        $this->create_table($this->get_tables()->campaigns(), [
            'id' => 'int auto_increment not null primary key',
            'message' => 'int not null',
            'type' => 'enum("SMS", "EMAIL")',
            'test' => 'bool',
            'finalized' => 'datetime default null',
            'foreign key (message)' =>   
                'references '.$this->get_tables()->messages().'(id)'
        ]);

        $this->create_table($this->get_tables()->send_log(), [
            'id' => 'int auto_increment not null primary key',
            'campaign' => 'int not null',
            'customer' => 'int not null',
            'sended' => 'datetime not null',
            'foreign key (campaign)' =>
                'references '.$this->get_tables()->campaigns().'(id)',
            'foreign key (customer)' =>
                'references '.$this->get_tables()->customers().'(id)'
        ]);

        $this->get_versions()->set_installed(1);
    
        return $this;
    }
}