<?php

namespace App\Komma\Kms\Transfer\Models;

use Illuminate\Database\Eloquent\Model;

class ColumnMap
{
    /** @var string */
    private $modelFQCN;

    /** @var mixed */
    private $modelFactoryMethod;

    /** @var string */
    private $modelAttributeName;

    /** @var mixed */
    private $mutator;

    /** @var string */
    private $columnKey;

    /**
     * ColumnMap constructor.
     * @param string $columnName
     */
    public function __construct(string $columnName)
    {
        $this->modelFQCN = '';
        $this->modelAttributeName = '';
        $this->columnKey = $columnName;
    }

    /**
     * @return string
     */
    public function getModelFQCN(): string
    {
        return $this->modelFQCN;
    }

    /**
     * Sets the model fully qualified class name so that the importer knows which model to make for the import
     *
     * @param string $modelFQCN
     * @return ColumnMap
     */
    public function setModelFQCN(string $modelFQCN)
    {
        if (! is_subclass_of($modelFQCN, Model::class)) {
            throw new \InvalidArgumentException('The given model name of "'.$modelFQCN.'" is no child of "'.Model::class.'" while it should be.');
        }
        $this->modelFQCN = $modelFQCN;

        return $this;
    }

    /**
     * @return string
     */
    public function getModelAttributeName(): string
    {
        return $this->modelAttributeName;
    }

    /**
     * Sets the attribute in which the columns value must be set.
     * Only relevant when the setModelFQCN method was used and not for the setModelFactory
     *
     * @param string $modelAttributeName
     * @return ColumnMap
     */
    public function setModelAttributeName(string $modelAttributeName): self
    {
        $this->modelAttributeName = $modelAttributeName;

        return $this;
    }

    /**
     * @return mixed
     */
    public function getMutator()
    {
        return $this->mutator;
    }

    /**
     * The mutator (a callable) transforms the column value to something else before passing it into the model or factory
     *
     * @param mixed $mutator
     * @return ColumnMap
     */
    public function setMutator($mutator): self
    {
        if (! is_callable($mutator)) {
            throw new \InvalidArgumentException('The mutator must be a callable');
        }
        $this->mutator = $mutator;

        return $this;
    }

    /**
     * @return mixed
     */
    public function getModelFactoryMethod()
    {
        return $this->modelFactoryMethod;
    }

    /**
     * Sets a factory function that is responsible for creating the model.
     * The factory must have the following signature parameters: ColumnMap $columnMap, string $value, int $rowNumber
     *
     * @param mixed $modelFactoryMethod
     * @return ColumnMap
     */
    public function setModelFactory($modelFactoryMethod): self
    {
        if (! is_callable($modelFactoryMethod)) {
            throw new \InvalidArgumentException('The model factory method must be a callable');
        }
        try {
            $reflectionFunction = new \ReflectionFunction($modelFactoryMethod);
        } catch (\ReflectionException $e) {
            throw new \InvalidArgumentException('Could not reflect the the factory method');
        }

        if ($reflectionFunction->getNumberOfRequiredParameters() !== 3) {
            throw new \InvalidArgumentException('The model factory method must accept 3 arguments: ColumnMap $columnMap, string $value, int $rowNumber');
        }

        $this->modelFactoryMethod = $modelFactoryMethod;

        return $this;
    }

    /**
     * Gets the columns name / key
     *
     * @return string
     */
    public function getColumnKey(): string
    {
        return $this->columnKey;
    }
}