<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

declare(strict_types=1);

namespace Nette\Schema\Elements;

use Nette\Schema\Context;
use Nette\Schema\DynamicParameter;
use Nette\Schema\Helpers;
use Nette\Schema\Schema;


final class Type implements Schema
{
    use Base;

    private string $type;
    private ?Schema $itemsValue = null;
    private ?Schema $itemsKey = null;

    /** @var array{?float, ?float} */
    private array $range = [null, null];
    private ?string $pattern = null;
    private bool $merge = true;


    public function __construct(string $type)
    {
        $defaults = ['list' => [], 'array' => []];
        $this->type = $type;
        $this->default = strpos($type, '[]') ? [] : $defaults[$type] ?? null;
    }


    public function nullable(): self
    {
        $this->type = 'null|' . $this->type;
        return $this;
    }


    public function mergeDefaults(bool $state = true): self
    {
        $this->merge = $state;
        return $this;
    }


    public function dynamic(): self
    {
        $this->type = DynamicParameter::class . '|' . $this->type;
        return $this;
    }


    public function min(?float $min): self
    {
        $this->range[0] = $min;
        return $this;
    }


    public function max(?float $max): self
    {
        $this->range[1] = $max;
        return $this;
    }


    /**
     * @internal  use arrayOf() or listOf()
     */
    public function items(string|Schema $valueType = 'mixed', string|Schema $keyType = null): self
    {
        $this->itemsValue = $valueType instanceof Schema
            ? $valueType
            : new self($valueType);
        $this->itemsKey = $keyType instanceof Schema || $keyType === null
            ? $keyType
            : new self($keyType);
        return $this;
    }


    public function pattern(?string $pattern): self
    {
        $this->pattern = $pattern;
        return $this;
    }


    /********************* processing ****************d*g**/


    public function normalize(mixed $value, Context $context): mixed
    {
        if ($prevent = (is_array($value) && isset($value[Helpers::PreventMerging]))) {
            unset($value[Helpers::PreventMerging]);
        }

        $value = $this->doNormalize($value, $context);
        if (is_array($value) && $this->itemsValue) {
            $res = [];
            foreach ($value as $key => $val) {
                $context->path[] = $key;
                $context->isKey = true;
                $key = $this->itemsKey
                    ? $this->itemsKey->normalize($key, $context)
                    : $key;
                $context->isKey = false;
                $res[$key] = $this->itemsValue->normalize($val, $context);
                array_pop($context->path);
            }

            $value = $res;
        }

        if ($prevent && is_array($value)) {
            $value[Helpers::PreventMerging] = true;
        }

        return $value;
    }


    public function merge(mixed $value, mixed $base): mixed
    {
        if (is_array($value) && isset($value[Helpers::PreventMerging])) {
            unset($value[Helpers::PreventMerging]);
            return $value;
        }

        if (is_array($value) && is_array($base) && $this->itemsValue) {
            $index = 0;
            foreach ($value as $key => $val) {
                if ($key === $index) {
                    $base[] = $val;
                    $index++;
                } else {
                    $base[$key] = array_key_exists($key, $base)
                        ? $this->itemsValue->merge($val, $base[$key])
                        : $val;
                }
            }

            return $base;
        }

        return Helpers::merge($value, $base);
    }


    public function complete(mixed $value, Context $context): mixed
    {
        $merge = $this->merge;
        if (is_array($value) && isset($value[Helpers::PreventMerging])) {
            unset($value[Helpers::PreventMerging]);
            $merge = false;
        }

        if ($value === null && is_array($this->default)) {
            $value = []; // is unable to distinguish null from array in NEON
        }

        $this->doDeprecation($context);

        $isOk = $context->createChecker();
        Helpers::validateType($value, $this->type, $context);
        $isOk() && Helpers::validateRange($value, $this->range, $context, $this->type);
        $isOk() && $value !== null && $this->pattern !== null && Helpers::validatePattern($value, $this->pattern, $context);
        $isOk() && is_array($value) && $this->validateItems($value, $context);
        $isOk() && $merge && $value = Helpers::merge($value, $this->default);
        $isOk() && $value = $this->doTransform($value, $context);
        if (!$isOk()) {
            return null;
        }

        if ($value instanceof DynamicParameter) {
            $expected = $this->type . ($this->range === [null, null] ? '' : ':' . implode('..', $this->range));
            $context->dynamics[] = [$value, str_replace(DynamicParameter::class . '|', '', $expected), $context->path];
        }
        return $value;
    }


    private function validateItems(array &$value, Context $context): void
    {
        if (!$this->itemsValue) {
            return;
        }

        $res = [];
        foreach ($value as $key => $val) {
            $context->path[] = $key;
            $context->isKey = true;
            $key = $this->itemsKey ? $this->itemsKey->complete($key, $context) : $key;
            $context->isKey = false;
            $res[$key] = $this->itemsValue->complete($val, $context);
            array_pop($context->path);
        }
        $value = $res;
    }
}

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