<?php

namespace ByJG\AnyDataset\Json;

use ByJG\AnyDataset\Core\Exception\IteratorException;
use ByJG\AnyDataset\Core\GenericIterator;
use ByJG\AnyDataset\Core\Row;
use InvalidArgumentException;

class JsonIterator extends GenericIterator
{
    /** @var ?array */
    private ?array $jsonObject;

    /**
     * Enter description here...
     *
     * @var int
     */
    private int $current = 0;
    private array $fieldDefinition = [];

    /**
     * JsonIterator constructor.
     *
     * @param array $jsonObject
     * @param string $path
     * @param bool $throwErr
     * @throws IteratorException
     */
    public function __construct(array $jsonObject, string $path = '', bool $throwErr = false)
    {
        $this->current = 0;

        if (empty($path)) {
            $this->jsonObject = $jsonObject;
            return;
        }

        $this->jsonObject = $this->parseField($jsonObject, explode("/", ltrim("$path/*", "/")), null);
        if (is_null($this->jsonObject)) {
            if ($throwErr) {
                throw new IteratorException("Invalid path '$path' in JSON Object");
            }
            $this->jsonObject = [];
        }
    }

    public function count(): int
    {
        return (count($this->jsonObject));
    }

    /**
     * @access public
     * @return bool
     */
    public function hasNext(): bool
    {
        if ($this->current < $this->count()) {
            return true;
        }

        return false;
    }

    /**
     * @access public
     * @return Row|null
     */
    public function moveNext(): ?Row
    {
        if (!$this->hasNext()) {
            return null;
        }

        return new Row($this->parseFields($this->jsonObject[$this->current++]));
    }

    private function parseFields(array $jsonObject): array
    {
        if (empty($this->fieldDefinition)) {
            return $jsonObject;
        }

        $valueList = [];
        $postProcessFields = [];
        /**
         * @var string $field
         * @var JsonFieldDefinition $value
         */
        foreach ($this->fieldDefinition as $field => $value) {
            if ($value->getPath() instanceof \Closure) {
                $postProcessFields[$field] = $value->getPath();
                continue;
            }
            $pathList = explode("/", ltrim($value->getPath(), "/"));
            $valueList[$field] = $value->validate($this->parseField($jsonObject, $pathList, $value->getDefaultValue()));
        }

        foreach ($postProcessFields as $field => $callback) {
            $valueList[$field] = $callback($valueList);
        }

        return $valueList;
    }

    private function parseField(array $record, array $pathList, mixed $defaultValue = null): mixed
    {
        $value = $record;
        while($pathElement = array_shift($pathList)) {
            if ($pathElement == "*") {
                $result = [];
                foreach ($value as $item) {
                    $parsedValue = $this->parseField($item, $pathList, $defaultValue);
                    if (!is_null($parsedValue)) {
                        $result[] = $parsedValue;
                    }
                }
                $value = $result;
                break;
            }
            if (!isset($value[$pathElement])) {
                $value = $defaultValue;
                break;
            }
            $value = $value[$pathElement];
        }

        return $value;
    }

    protected function validateValueAgainstFieldDefinition($value, $fieldDefinition)
    {
    }

    public function key(): int
    {
        return $this->current;
    }

    /**
     * @param array $definition
     * @return $this
     */
    public function withFields(array $definition): static
    {
        foreach ($definition as $field => $value) {
            if ($value instanceof JsonFieldDefinition) {
                $field = $value->getFieldName();
            } else {
                $value = JsonFieldDefinition::create($field, $value);
            }

            if (array_key_exists($field, $this->fieldDefinition)) {
                throw new InvalidArgumentException("Field '$field' already defined");
            }

            $this->fieldDefinition[$field] = $value;
        }
        return $this;
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----Njc3MDM5MTQ2MTI0MjM0MiA5OTcyODgyODIzNDQ1NTY5IDIzMTcyNzQ3NzQzMjg1MDQ=