<?php

namespace LDC\LDCCRM\Models;

use Exception;
use JsonSerializable;
use Kwaadpepper\Enum\BaseEnum;
use LDC\LDCCRM\Enums\ArcadiaOrderType;
use LDC\LDCCRM\Enums\Country;
use LDC\LDCCRM\Exceptions\ValidationException;
use LDC\LDCCRM\Transport\ApiInterface;
use LDC\LDCCRM\Utils;
use ReflectionClass;
use ReflectionProperty;
use TypeError;

/**
 * @ignore
 * Base Class for crm client models
 *
 * @category Api Models
 * @package LDCCrmClient
 * @subpackage models
 */
abstract class CrmClientModel implements JsonSerializable
{

    /**
     * Is true if this model was not filled from crm
     *
     * @var boolean
     */
    private $isNew = true;

    /**
     * The Api object that will handle requests and responses
     *
     * @var \LDC\LDCCRM\Transport\ApiInterface
     */
    protected static $apiInterface;

    /**
     * Validation rules
     *
     * @var array
     */
    protected static $validation = [];

    /**
     * Model fields
     *
     * @var array
     */
    protected $modelFields = [];

    /**
     * The crm fields
     * that should not be visible
     *
     * @var array
     */
    protected $invisibleFields = [];

    /**
     * Model updated values
     */
    protected $updatedValues = [];

    public function __construct()
    {
        self::setUpApiInterface();
        return $this;
    }

    public function __get(string $field)
    {
        $props = \array_diff(
            $this->modelFields,
            $this->invisibleFields
        );
        if (in_array($field, $props)) {
            return self::getRawProperty($this, $field);
        }
        return null;
    }

    /**
     * Set prop
     *
     * @param string $field
     * @param mixed $value
     * @throws TypeError if the field has an incorrect value
     * @return mixed|null The input value or null is this prop does not exists
     */
    public function __set(string $field, $value)
    {
        if (in_array($field, $this->modelFields)) {
            $type = $this->getPropType($field);
            if (!$this->checkFieldType($type, $value)) {
                throw new TypeError("Wrong type for $field");
            }
            $this->validateValue($field, $value);
            $this->updatedValues[$field] = $value;
            return $this->setRawProperty($this, $field, $value);
        }
        return null;
    }

    protected static function setUpApiInterface()
    {
        self::$apiInterface = self::$apiInterface ?: new ApiInterface();
    }

    /**
     * Fill values into model
     *
     * @param array $properties
     * @return void
     */
    public function fill(array $properties)
    {
        if (count($properties)) {
            foreach ($properties as $field => $value) {
                self::setRawProperty($this, $field, $value);
            }
        }
    }

    /**
     * Set all properties to without any validation
     *
     * @param array $properties
     * @return void
     */
    protected function fillRaw(array $properties)
    {
        if (count($properties)) {
            foreach ($properties as $field => $value) {
                self::setRawProperty($this, $field, $value);
            }
        }
    }

    /**
     * Validate all model properties
     *
     * @return array the validated values
     */
    protected function validateAllValues(array $ignore = []): array
    {
        $out = [];
        foreach (static::$validation as $field => $validationRules) {
            if (\in_array($field, $ignore) or \is_null(self::getRawProperty($this, $field))) {
                continue;
            }
            $this->validateValue($field, self::getRawProperty($this, $field));
            $out[$field] = self::getRawProperty($this, $field);
        }
        return $out;
    }

    /**
     * Validate a value against its rules
     *
     * @param string $field
     * @param mixed $value
     * @return boolean
     * @throws TypeError
     */
    protected static function validateValue(string $field, $value): bool
    {
        if (!isset(static::$validation[$field])) {
            throw new Exception("$field has no validation rule");
        }
        $validator = Utils::makeValidator(
            [$field => $value],
            [$field => static::$validation[$field]]
        );
        if ($validator()) {
            throw new ValidationException(implode(' ', $validator->errors()->get($field)));
        }
        return true;
    }

    /**
     * Check a value against its field type
     *
     * @param string $type
     * @param mixed $value
     * @return boolean
     * @throws Exception if type is not handled handled types are bool, string,
     *                   int, \LDC\LDCCRM\Enums\Country,  \LDC\LDCCRM\Enums\ArcadiaOrderType
     */
    protected function checkFieldType(string $type, $value): bool
    {
        switch ($type) {
            case '\\' . Country::class:
                try {
                    $value = \is_int($value) ? Country::make($value) : $value;
                } finally {
                    return \is_object($value) and (get_class($value) === Country::class or
                        \in_array(Country::class, \class_parents($value)));
                }
            case '\\' . ArcadiaOrderType::class:
                try {
                    $value = \is_int($value) ? ArcadiaOrderType::make($value) : $value;
                } finally {
                    return \is_object($value) and (get_class($value) === ArcadiaOrderType::class or
                        \in_array(ArcadiaOrderType::class, \class_parents($value)));
                }
            case 'bool':
                $value = \is_int($value) ? (bool)$value : $value;
                return \is_bool($value);
            case 'string':
                return \is_string($value);
            case 'int':
                return \is_int($value);
            default:
                throw new Exception(\sprintf("Unhandled $type for %s", \json_encode($value)));
        }
    }

    /**
     * Get the type of any of this class property
     * from doc comment
     *
     * @param string $property
     * @return string|null the type or null if not defined
     */
    protected function getPropType(string $property)
    {
        $matches = [];
        $propReflection = new ReflectionProperty(static::class, $property);
        $docComment = $propReflection->getDocComment();
        preg_match_all('/@var ([\w_\x5c]+)/', $docComment, $matches);
        if (isset($matches[1][0]) and in_array($matches[1][0], [
            'string', 'int', 'bool', '\\' . Country::class, '\\' . ArcadiaOrderType::class
        ], true)) {
            return $matches[1][0];
        }
        return null;
    }

    /**
     * Set a property withou any validation
     *
     * @param string $field
     * @param mixed $value
     * @return void
     */
    protected static function setRawProperty(object $object, string $field, $value): void
    {
        if (is_object($value) and in_array(BaseEnum::class, class_parents($value))) {
            $value = $value->value;
        }
        $refClass = new ReflectionClass(\get_class($object));
        $refProp = $refClass->getProperty($field);
        $refProp->setAccessible(true);
        $refProp->setValue($object, $value);
    }

    /**
     * Get a property
     *
     * @param string $field
     * @param mixed $value
     * @return mixed
     */
    protected static function getRawProperty(object $object, string $field)
    {
        $refClass = new ReflectionClass(\get_class($object));
        $refProp = $refClass->getProperty($field);
        $refProp->setAccessible(true);
        return $refProp->getValue($object);
    }

    /**
     * Assert primaryKey is valid
     *
     * @param int $primaryKey
     * @return void
     * @throws LDC\LDCCRM\Exceptions\ValidationException
     */
    protected static function assertValidPrimaryKey(int $primaryKey): void
    {
        $validator = Utils::makeValidator(
            ['id' => $primaryKey],
            ['id' => 'required|int']
        );
        if ($validator()) {
            throw new ValidationException(implode(' ', $validator->errors()->get('id')));
        }
    }

    /**
     * Assert hashcode is valid
     *
     * @param string|null $hashcode
     * @return void
     * @throws LDC\LDCCRM\Exceptions\ValidationException
     */
    protected static function assertValidHascode(?string $hashcode): void
    {
        $validator = Utils::makeValidator(
            ['hashcode' => $hashcode],
            ['hashcode' => 'required|uuid']
        );
        if ($validator()) {
            throw new ValidationException(implode(' ', $validator->errors()->get('hashcode')));
        }
    }
}