<?php

use Spark\Commands\Command;
use Spark\Environment\Environment;
use Spark\Pipe\Filters\FilterInterface;
use Spark\Pipe\Filters\PhpFilter;
use Spark\Resource\ResourceType;
use Spark\SparkApplication;

$HELPERS = [];

function object(...$data) {
    return (object)$data;
}

function register_helper(string $name, callable $helper) {
    global $HELPERS;
    $HELPERS[$name] = $helper;
}

function helper(string $name, ...$args) {
    global $HELPERS;
    if (!array_key_exists($name, $HELPERS)) {
        fprintf(STDERR, "error: No helper %s registered", $name);
        return false;
    }
    $helper = $HELPERS[$name];
    return $helper(...$args);
}

function register_plugin(string $name, SparkPlug $plugin) {
    $refl = new ReflectionClass($plugin);
    $psr4 = object(
        namespace: $refl->getNamespaceName()."\\",
        path: dirname($refl->getFileName())."/"
    );
    spl_autoload_register(function ($class) use ($psr4) {
        if (str_starts_with($class, $psr4->namespace)) {
            $part = substr($class, strlen($psr4->namespace));
            $file = $psr4->path . strtr($part, "\\", DIRECTORY_SEPARATOR).".php";
            if (file_exists($file)) {
                require_once $file;
            }
        }
    });
    SparkApplication::$instance->getPluginManager()->registerPlugin($name, $plugin);
}

function get_plugin(string $name) {
    return SparkApplication::$instance->getPluginManager()->getPlugin($name);
}

function register_command(Command $command) {
    SparkApplication::$instance->add($command);    
}

function get_environment(): Environment {
    return SparkApplication::$instance->getEnvironment();
}

function register_resource_type(string $name, string $type) {
    SparkApplication::$instance->getResourceManager()->registerResourceType($name, $type);
}

function create_resource(string $name, string $type, ...$options) {
    return SparkApplication::$instance->getResourceManager()->createNamedResource($name, $type, $options);
}

function get_resource(string $name) {
    return SparkApplication::$instance->getResourceManager()->getNamedResource($name);
}

function resource(string $name) {
    return get_resource($name);
}

function read_config($file=null) {
    if (!$file) return;
    $abs = get_environment()->getConfigDirectory() . "/" . $file;
    if (!file_exists($abs)) {
        //fprintf(STDERR, "warning: Can't read config file %s\n", $abs);
        return [];
    }
    return (array)json_decode(file_get_contents($abs), true);
}


// ------ Filters ------

$FILTERS = [];

function register_filter(string $name, string|callable $filter) {
    global $FILTERS;
    $FILTERS[$name] = $filter;
}

function get_registered_filters(): array
{
    global $FILTERS;
    return array_keys($FILTERS);
}

function get_filter(string $name, array $args=[]): null|FilterInterface|callable
{
    global $FILTERS;
    $filter = $FILTERS[$name]??null;
    if (is_string($filter) && class_exists($filter)) {
        $filter = new $filter;
    }
    if (is_callable($filter)) {
        $filter = new PhpFilter($filter);
    }
    if ($filter instanceof FilterInterface) {
        $filter->setArguments($args);
    }
    return $filter;
}