<?php

namespace Lean;

use Psr\Container\ContainerInterface;

class Lean
{
    const DEFAULT_PICEA_CONTEXT  = __NAMESPACE__;

    protected ContainerInterface $container;

    public array $applications = [];

    public function __construct(ContainerInterface $container)
    {
        $this->container = $container;

        $this->loadApplications();
    }

    protected function loadApplications() : void
    {
        $list = array_filter($this->container->get('config')['lean']['autoload'] ?? []);

        if (! $list ) {
            throw new \Exception("You must provide at least one application to autoload within your config file ( 'lean' => 'autoload' => [] )");
        }

        # Allows 'lean.default' and [ 'lean.default', 100 ] which allows ordering of apps loading.
        usort($list, fn($e1, $e2) => ( is_array($e1) ? $e1[1] : 0 ) <=> ( is_array($e2) ? $e2[1] : 0 ));

        foreach(array_map(fn($item) => is_array($item) ? $item[0] : $item, $list) as $application) {
            if ( $this->container->has($application) ) {
                $this->applications[] = ( new Application($application) )->fromArray($this->container->get($application));
            }
            else {
                throw new \RuntimeException("Trying to load an application '$application' which have not been configured yet");
            }
        }
    }

    public function getApplication(string $name) : ? Application
    {
        foreach($this->applications as $app) {
            if ($app->name === $name) {
                return $app;
            }
        }

        return null;
    }

    public function getPiceaContext() /*: string|array */
    {
        foreach(array_reverse($this->applications) as $apps) {
            if ( $apps->piceaContext ?? null ) {
                return $apps->piceaContext;
            }
        }

        return static::DEFAULT_PICEA_CONTEXT;
    }

    public function getPiceaExtensions() : array
    {
        $list = [];

        foreach(array_reverse($this->applications) as $apps) {
            if ( $apps->piceaExtensions ?? null ) {
                $list = array_merge($list, $apps->piceaExtensions);
            }
        }

        return $list;
    }

    public function getRoutable() : array
    {
        return array_merge(...array_map(fn($app) => $app->routes ?? [], $this->applications));
    }

    public function getCronard() : array
    {
        return array_merge(...array_map(fn($app) => $app->cronard ?? [], $this->applications));
    }

    public function getCLI() : array
    {
        return array_merge(...array_map(fn($app) => $app->cli ?? [], $this->applications));
    }

    public function getEvents() : array
    {
        return array_merge(...array_map(fn($app) => $app->events ?? [], $this->applications));
    }

    public function getTaxusPrivileges() : array
    {
        return array_merge(...array_map(fn($app) => $app->taxus ?? [], $this->applications));
    }

    public function getEntities() : array
    {
        return array_merge(...array_map(fn($app) => $app->entities ?? [], $this->applications));
    }

    public function getViewPaths() : array
    {
        $list = array_merge(...array_map(fn($app) => $app->views ?? [], $this->applications));

        $this->verifyPathList($list);

        uasort($list, fn($i1, $i2) => $i1['order'] <=> $i2['order'] );

        return $list;
    }

    public function getAssetPaths() : array
    {
        $list = array_merge(...array_map(fn($app) => $app->piceaAssets ?? [], $this->applications));

        $this->verifyPathList($list);

        uasort($list, fn($i1, $i2) => $i1['order'] <=> $i2['order'] );

        return $list;
    }

    protected function verifyPathList(array $list) : void
    {
        foreach($list as $item) {
            if (! isset($item['order']) ) {
                throw new \RuntimeException(sprintf("An error occured while verifying a path list (%s)", json_encode($item, \JSON_PRETTY_PRINT)));
            }
        }
    }

    public function getI18n(string $reader) : ? array
    {
        switch($reader) {
            case "php":
                $list = array_merge(...array_map(fn($app) => $app->tellPhp ?? [], $this->applications));
                break;

            case "json":
                $list = array_merge(...array_map(fn($app) => $app->tellJson ?? [], $this->applications));
                break;
        }

        if ( $list ?? false ) {
            uasort($list, fn($i1, $i2) => $i2['order'] <=> $i1['order']);

            return array_map(fn($item) => $item['path'], $list);
        }

        return null;
    }

    #[\Deprecated("Definitions are now loaded automatically from composer extra array.")]
    public static function definitions() : array
    {
        return [];
    }

    public static function getDefinitionsPathsFromComposer() : array
    {
        $list = [];

        foreach(Composer::readComposerLock()['packages'] as $package) {
            $order = $package['extra']['lean']['autoload']['order'] ?? 0;

            foreach($package['extra']['lean']['autoload']['definitions'] ?? [] as $autoload) {
                $list[] = [ static::pathFromPackage($package, $autoload), $order ];
            }
        }

        foreach(Composer::readComposerJson()['extra']['lean']['autoload']['definitions'] ?? [] as $autoload) {
            $order = $package['extra']['lean']['autoload']['order'] ?? 1000;

            $list[] = [ getenv('PROJECT_PATH') . DIRECTORY_SEPARATOR . $autoload, $order ];
        }

        # Allows 'lean.default' and [ 'lean.default', 100 ] which allows ordering of apps loading.
        usort($list, fn($e1, $e2) => $e1[1] <=>  $e2[1]);

        return array_column($list, 0);
    }

    public static function autoloadConfigFromComposerExtra() : array
    {
        $list = [];

        foreach(Composer::readComposerLock()['packages'] as $package) {
            foreach($package['extra']['lean']['autoload']['config'] ?? [] as $autoload) {
                $list = array_merge_recursive($list, static::loadFromPackage($package, $autoload));
            }
        }

        foreach(Composer::readComposerJson()['extra']['lean']['autoload']['config'] ?? [] as $autoload) {
            $list = array_merge_recursive($list, static::loadFromPackage(null, $autoload));
        }

        return $list;
    }

    protected static function pathFromPackage(?array $package, array|string $autoload) : string
    {
        if ($package === null) {
            $filepath = getenv('PROJECT_PATH') . DIRECTORY_SEPARATOR . $autoload;
        }
        else {
            $vendor = getenv('VENDOR_DIR') ? getenv('VENDOR_PATH') : dirname(__DIR__, 3);
            $filepath = $vendor . DIRECTORY_SEPARATOR . $package['name'] . DIRECTORY_SEPARATOR . $autoload;
        }

        if (! file_exists($filepath)) {
            throw new \InvalidArgumentException("Given definition filepath do not exists '$filepath'");
        }

        return $filepath;
    }

    protected static function loadFromPackage(? array $package, array|string $autoload) : false|array
    {
        $list = [];

        if (is_string($autoload)) {
            $file = static::pathFromPackage($package, $autoload);

            if ( ! file_exists($file) ) {
                throw new \InvalidArgumentException(sprintf("Given autoload file `%s` from package `%s` was not found or is unreachable", $autoload, $package['name']));
            }

            return require($file);
        }

        $func = implode('::', array_merge([ key($autoload) ], $autoload));

        return call_user_func($func);
    }
}