<?php

namespace PSC\Library\Calc\Graph;

use PSC\Library\Calc\Model\Part;
use PSC\Library\Calc\Model\PartCollection;
use SVG\Nodes\Shapes\SVGRect;
use SVG\Nodes\Structures\SVGDocumentFragment;
use SVG\Nodes\Texts\SVGText;
use SVG\Nodes\Texts\SVGTSpan;
use SVG\SVG;

class Graph
{
    protected PartCollection $calcFormel;

    protected Parser $parser;
    protected Calc $calc;

    public function __construct(string $formulas = '', string $params = '')
    {
        $this->calcFormel = new PartCollection();
        $this->parser = new Parser($formulas, $params);
        $this->calc = new Calc($params, $formulas);
    }

    public function addCalcFormel(Part $formel): void
    {
        $this->calcFormel->addPart($formel);
    }

    public function addPart(Part $part): void
    {
        $this->parser->addPart($part);
    }

    private function build(): bool
    {
        $this->parser->parseInternals();
        foreach ($this->calcFormel->getData() as $formel) {
            $this->parser->parse($formel);
        }

        foreach ($this->calcFormel->getData() as $formel) {
            $this->calc->calc($formel);
        }

        return true;
    }

    public function getSum(): float
    {
        return round(array_reduce($this->calcFormel->getData(), fn($sum, $item) => $sum + $item->getResult(), 0), 2);
    }

    public function generateJsonGraph(): string
    {
        $this->build();
        $json = [];
        foreach ($this->calcFormel->getData() as $part) {
            $json[] = $part->toArray();
        }

        return json_encode($json);
    }

    public function generateSVGGraph(): string
    {
        $image = new SVG(1000, 1000);
        $doc = $image->getDocument();
        $doc->setStyle('background-color', '#ffffff');
        $bg = new SVGRect(0, 0, 1000, 1000);
        $bg->setAttribute('fill', '#ffffff');
        $doc->addChild($bg);
        $x = 20;
        $y = 0;

        foreach ($this->calcFormel as $formel) {
            $y = $this->renderSubPart($x, $y, $doc, $formel);
        }

        return $image->toXMLString();
    }

    private function renderSubPart(int $x, int $y, SVGDocumentFragment $doc, Part $part): int
    {
        $y = $y + 20;
        if (count($part->getChildren()) > 0) {
            $textC = new SVGText('', $x, $y);
            $span1 = new SVGTSpan();
            $span1->setValue(sprintf('%s', $part->getName()));
            $textC->addChild($span1);

            $pattern = '/(\$[FPV][a-zA-Z0-9]+\$[FPV])/';

            $parts = preg_split($pattern, $part->getUnparsed(), -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);

            foreach ($parts as $subPart) {
                $child = $part->getChildrenByName($subPart);
                if ($child) {
                    $span1 = new SVGTSpan();
                    $span1->setValue(sprintf('%s (%s)', $subPart, $child->getResult()));
                    $span1->setAttribute('dx', 10);
                    $span1->setAttribute('fill', $child->getColor());
                    $textC->addChild($span1);
                    $x = $x + 20;
                    $y = $this->renderSubPart($x, $y, $doc, $child);
                } else {
                    $span1 = new SVGTSpan();
                    $span1->setValue($subPart);
                    $span1->setAttribute('dx', 10);
                    $textC->addChild($span1);
                }
            }
        } else {
            $textC = new SVGText('', $x, $y);
            $span1 = new SVGTSpan();
            $span1->setValue($part->getUnparsed());
            $span1->setAttribute('dx', 10);
            $textC->addChild($span1);
        }
        $doc->addChild($textC);
        return $y;
    }
}