<?php

namespace SparkPost\SendGridCompatibility;

class Email
{
    public $model;

    /**
     * Sets up the model for saving the configuration.
     */
    public function __construct()
    {
        $this->model = array();
    }

    /**
     * adds addresses as recipients.
     *
     * @param string $address
     * @param string $name    optional
     *
     * @return $this
     */
    public function addTo($address, $name = null)
    {
        if (!isset($this->model['recipients'])) {
            $this->model['recipients'] = array();
        }

        if (isset($name)) {
            $address = array('address' => array('email' => $address, 'name' => $name));
        } else {
            $address = array('address' => array('email' => $address));
        }

        array_push($this->model['recipients'], $address);

        return $this;
    }

    /**
     * explicitly sets a list of addresses.
     *
     * @param array $addresses
     *
     * @return $this
     */
    public function setTos(array $addresses)
    {
        $this->model['recipients'] = $addresses;

        return $this;
    }

    /**
     * sets the from address.
     *
     * @param string $address
     *
     * @return $this
     */
    public function setFrom($address)
    {
        $this->model['from'] = array('email' => $address);

        return $this;
    }

    /**
     * Sets the name for the from address.
     *
     * @param string $name
     *
     * @return $this
     *
     * @throws \Exception
     */
    public function setFromName($name)
    {
        if (!isset($this->model['from'])) {
            throw new \Exception('Must set \'From\' prior to setting \'From Name\'.');
        }
        $this->model['from']['name'] = $name;

        return $this;
    }

    /**
     * sets the reply to field.
     *
     * @param string $address
     *
     * @return $this
     */
    public function setReplyTo($address)
    {
        $this->model['replyTo'] = $address;

        return $this;
    }

    /**
     * throws an error because bcc fields are not yet implemented.
     *
     * @throws \Exception
     *
     * @param string $address
     *
     * @return $this
     */
    public function addBcc($address)
    {
        throw new \Exception('Adding bcc recipients is not yet supported, try adding them as a \'to\' address');
    }

    /**
     * sets the subject header.
     *
     * @param string $subject
     *
     * @return $this
     */
    public function setSubject($subject)
    {
        $this->model['subject'] = $subject;

        return $this;
    }

    /**
     * sets the text body.
     *
     * @param string $text
     *
     * @return $this
     */
    public function setText($text)
    {
        $this->model['text'] = $text;

        return $this;
    }

    /**
     * sets the html body.
     *
     * @param string $html
     *
     * @return $this
     */
    public function setHtml($html)
    {
        $this->model['html'] = $html;

        return $this;
    }

    /**
     * Throws an exception since adding categories is not yet supported.
     *
     * @param string $category
     *
     * @throws \Exception
     */
    public function addCategory($category)
    {
        throw new \Exception('Adding categories is not yet supported');
    }

    /**
     * Throws an exception since adding attachments is not yet supported.
     *
     * @throws \Exception
     *
     * @param mixed $attachment
     */
    public function addAttachment($attachment)
    {
        throw new \Exception('Adding attachments is not yet supported');
    }

    /**
     * Adds transmission level substitution data.
     *
     * @param string $name
     * @param mixed  $values
     *
     * @return $this
     */
    public function addSubstitution($name, $values)
    {
        if (!isset($this->model['substitutionData'])) {
            $this->model['substitutionData'] = array();
        }
        $this->model['substitutionData'][$name] = $values;

        return $this;
    }

    /**
     * Adds transmission level substitution data.
     *
     * @param string $name
     * @param mixed  $values
     */
    public function addSection($name, $values)
    {
        $this->addSubstitution($name, $values);
    }

    /**
     * Throws an exception because arguments for third party systems is not supported.
     *
     * @throws \Exception
     *
     * @param mixed $value
     */
    public function addUniqueArg($key, $value)
    {
        throw new \Exception('Adding Unique Arguments is not yet supported');
    }

    /**
     * Throws an exception because arguments for third party systems is not supported.
     *
     * @throws \Exception
     *
     * @param mixed $values
     */
    public function setUniqueArgs(array $values)
    {
        throw new \Exception('Setting Unique Arguments is not yet supported');
    }

    /**
     * Adds custom headers to the email header.
     *
     * @param string $name
     * @param string $value
     */
    public function addHeader($name, $value)
    {
        if (!isset($this->model['customHeaders'])) {
            $this->model['customHeaders'] = array();
        }
        $this->model['customHeaders'][$name] = $value;
    }

    /**
     * converts this object to a configuration for a SparkPost transmission.
     *
     * @return array
     */
    public function toSparkPostTransmission()
    {
        return $this->model;
    }
}