<?php

namespace Frs;

class FieldDefinition
{
    private $fieldData = array();

    /**
     * @param string $type Type of FieldDefinition (hotel, car, etc.)
     * @throws \Exception if no definition file for this $type is found
     */
    public function __construct($type)
    {
        $definitionFile = 'definitions/' . $type . '.json';
        if (!file_exists($definitionFile)) {
            throw new \Exception('File ' . $definitionFile . ' not found!');
        }
        $fieldDataJson   = file_get_contents($definitionFile);
        $fieldData       = json_decode($fieldDataJson, true);
        if (!is_array($fieldData)) {
            $fieldData = array($fieldData);
        }
        $this->fieldData = $fieldData;
    }

    public function getFieldData()
    {
        return $this->fieldData;
    }

    public function getGroups()
    {
        $byGroup = array();
        foreach ($this->fieldData['groups'] as $id=>$group) {
            $byGroup[$group] = array(
                'group_name' => $group,
                'fields'     => array(),
            );
        }

        foreach ($this->fieldData['fields'] as $key=>$meta) {
            $groupName = $this->fieldData['groups'][$meta['group']];
            $byGroup[$groupName]['fields'][] = $meta;
        }

        return $byGroup;
    }

    /**
     * Adds the given $values or default values and replaces $placeholders. Also
     * adds some helping attributes to fields.
     *
     * @param mixed[] Key-value-array of values (value) to assign to fields (key)
     * @param string[] Key-value-array of values (value) to replace placeholders (key) with
     */
    public function addFieldValues($values = array(), $placeholders = array())
    {
        foreach ($this->fieldData['fields'] as $key=>$meta) {
            $meta['field_id']   = $key;
            $groupName          = $this->fieldData['groups'][$meta['group']];
            $meta['group_name'] = $groupName;

            // Assign session value if set, or use default if set
            if (isset($values[$key])) {
                $meta['value'] = $values[$key];

                switch ($meta['type']) {
                    case 'datetime':
                        $meta['value_unixtime'] = strtotime($meta['value']);
                        break;
                }

            } elseif (isset($meta['default'])) {
                if (isset($placeholders[$meta['default']])) {
                    $meta['value'] = $placeholders[$meta['default']];
                } else {
                    $meta['value'] = $meta['default'];
                }
            }

            // Field type marker for Mustache
            $meta['fieldtype_' . $meta['type']] = true;

            // Add useful default values for some types
            switch ($meta['type']) {
                case 'datetime':
                    $meta['min'] = date('Y-m-d');
                    $meta['today'] = date('Y-m-d');
                    break;
            }

            // Add to fieldlist
            $this->fieldData['fields'][$key] = $meta;
        }
    }
}