<?php

namespace League\Plates;

use League\Plates\Extension\ExtensionInterface;
use League\Plates\Template\Data;
use League\Plates\Template\Directory;
use League\Plates\Template\FileExtension;
use League\Plates\Template\Folders;
use League\Plates\Template\Func;
use League\Plates\Template\Functions;
use League\Plates\Template\Name;
use League\Plates\Template\Template;

/**
 * Template API and environment settings storage.
 */
class Engine
{
    /**
     * Default template directory.
     * @var Directory
     */
    protected $directory;

    /**
     * Template file extension.
     * @var FileExtension
     */
    protected $fileExtension;

    /**
     * Collection of template folders.
     * @var Folders
     */
    protected $folders;

    /**
     * Collection of template functions.
     * @var Functions
     */
    protected $functions;

    /**
     * Collection of preassigned template data.
     * @var Data
     */
    protected $data;

    /**
     * Create new Engine instance.
     * @param string $directory
     * @param string $fileExtension
     */
    public function __construct($directory = null, $fileExtension = 'php')
    {
        $this->directory = new Directory($directory);
        $this->fileExtension = new FileExtension($fileExtension);
        $this->folders = new Folders();
        $this->functions = new Functions();
        $this->data = new Data();
    }

    /**
     * Set path to templates directory.
     * @param  string|null $directory Pass null to disable the default directory.
     * @return Engine
     */
    public function setDirectory($directory)
    {
        $this->directory->set($directory);

        return $this;
    }

    /**
     * Get path to templates directory.
     * @return string
     */
    public function getDirectory()
    {
        return $this->directory->get();
    }

    /**
     * Set the template file extension.
     * @param  string|null $fileExtension Pass null to manually set it.
     * @return Engine
     */
    public function setFileExtension($fileExtension)
    {
        $this->fileExtension->set($fileExtension);

        return $this;
    }

    /**
     * Get the template file extension.
     * @return string
     */
    public function getFileExtension()
    {
        return $this->fileExtension->get();
    }

    /**
     * Add a new template folder for grouping templates under different namespaces.
     * @param  string  $name
     * @param  string  $directory
     * @param  boolean $fallback
     * @return Engine
     */
    public function addFolder($name, $directory, $fallback = false)
    {
        $this->folders->add($name, $directory, $fallback);

        return $this;
    }

    /**
     * Remove a template folder.
     * @param  string $name
     * @return Engine
     */
    public function removeFolder($name)
    {
        $this->folders->remove($name);

        return $this;
    }

    /**
     * Get collection of all template folders.
     * @return Folders
     */
    public function getFolders()
    {
        return $this->folders;
    }

    /**
     * Add preassigned template data.
     * @param  array             $data;
     * @param  null|string|array $templates;
     * @return Engine
     */
    public function addData(array $data, $templates = null)
    {
        $this->data->add($data, $templates);

        return $this;
    }

    /**
     * Get all preassigned template data.
     * @param  null|string $template;
     * @return array
     */
    public function getData($template = null)
    {
        return $this->data->get($template);
    }

    /**
     * Register a new template function.
     * @param  string   $name;
     * @param  callback $callback;
     * @return Engine
     */
    public function registerFunction($name, $callback)
    {
        $this->functions->add($name, $callback);

        return $this;
    }

    /**
     * Remove a template function.
     * @param  string $name;
     * @return Engine
     */
    public function dropFunction($name)
    {
        $this->functions->remove($name);

        return $this;
    }

    /**
     * Get a template function.
     * @param  string $name
     * @return Func
     */
    public function getFunction($name)
    {
        return $this->functions->get($name);
    }

    /**
     * Check if a template function exists.
     * @param  string  $name
     * @return boolean
     */
    public function doesFunctionExist($name)
    {
        return $this->functions->exists($name);
    }

    /**
     * Load an extension.
     * @param  ExtensionInterface $extension
     * @return Engine
     */
    public function loadExtension(ExtensionInterface $extension)
    {
        $extension->register($this);

        return $this;
    }

    /**
     * Load multiple extensions.
     * @param  array  $extensions
     * @return Engine
     */
    public function loadExtensions(array $extensions = array())
    {
        foreach ($extensions as $extension) {
            $this->loadExtension($extension);
        }

        return $this;
    }

    /**
     * Get a template path.
     * @param  string $name
     * @return string
     */
    public function path($name)
    {
        $name = new Name($this, $name);

        return $name->getPath();
    }

    /**
     * Check if a template exists.
     * @param  string  $name
     * @return boolean
     */
    public function exists($name)
    {
        $name = new Name($this, $name);

        return $name->doesPathExist();
    }

    /**
     * Create a new template.
     * @param  string   $name
     * @return Template
     */
    public function make($name)
    {
        return new Template($this, $name);
    }

    /**
     * Create a new template and render it.
     * @param  string $name
     * @param  array  $data
     * @return string
     */
    public function render($name, array $data = array())
    {
        return $this->make($name)->render($data);
    }
}