<?php declare(strict_types=1);

namespace Picea;

class Builder
{
    public const TEMPLATE_CLASSNAME_PREFIX = "PiceaTemplate_";

    protected string $templatePath = "";

    public function __construct(string $templatePath = "./Builder/ClassTemplate.php")
    {
        $this->templatePath = $templatePath;
    }

    public function build(Compiler\Context &$context, string $compiledSource) : Compiler\Context
    {
        $path = fn($p) => addslashes(str_replace('/', DIRECTORY_SEPARATOR, $p));
        
        $context->className = static::generateClassName($context->viewPath);

        $replace = [
            '%NAMESPACE%' => $context->namespace,
            '%USE%' => ( $uses = $context->renderUses() ) ? $uses : false,
            '%CLASSNAME%' => $context->className,
            '%PATHNAME%' => $path($context->viewPath),
            '%FULLPATH%' => $path($context->filePath),
            '%TEMPLATE%' => $path($this->templatePath),
            '%EXTENDS%' => $context->extendFrom ? "extends " . static::TEMPLATE_CLASSNAME_PREFIX . static::generateClassUID($context->extendFrom) : '',
            '%EXTENDS_TEMPLATE%' => $context->extendFrom,
            '%CONTENT%' => $compiledSource,
            '%FUNCTIONS%' => $context->functionStack ? $context->renderFunctions() : "",
            '%PARENT_OUTPUT%' => $context->extendFrom ? "parent::output(\$variablesList);" : "",
        ];

        $context->compiledSource = str_replace(array_keys($replace), array_values($replace), file_get_contents($this->templatePath));

        return $context;
    }

    public static function generateClassName(string $filepath) : string
    {
        return static::TEMPLATE_CLASSNAME_PREFIX . static::generateClassUID($filepath);
    }

    public static function generateClassUID(string $filePath) : string
    {
        return md5($filePath);
    }
}