<?php
/*
 * This file is part of Flarum.
 *
 * (c) Toby Zerner <toby.zerner@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Flarum\Foundation;

use Illuminate\Container\Container;
use Illuminate\Contracts\Foundation\Application as ApplicationContract;
use Illuminate\Events\EventServiceProvider;
use Illuminate\Support\Arr;
use Illuminate\Support\ServiceProvider;
use Illuminate\Support\Str;

class Application extends Container implements ApplicationContract
{
    /**
     * The Flarum version.
     *
     * @var string
     */
    const VERSION = '0.1.0-beta.5';

    /**
     * The base path for the Flarum installation.
     *
     * @var string
     */
    protected $basePath;

    /**
     * The public path for the Flarum installation.
     *
     * @var string
     */
    protected $publicPath;

    /**
     * Indicates if the application has "booted".
     *
     * @var bool
     */
    protected $booted = false;

    /**
     * The array of booting callbacks.
     *
     * @var array
     */
    protected $bootingCallbacks = [];

    /**
     * The array of booted callbacks.
     *
     * @var array
     */
    protected $bootedCallbacks = [];

    /**
     * All of the registered service providers.
     *
     * @var array
     */
    protected $serviceProviders = [];

    /**
     * The names of the loaded service providers.
     *
     * @var array
     */
    protected $loadedProviders = [];

    /**
     * The deferred services and their providers.
     *
     * @var array
     */
    protected $deferredServices = [];

    /**
     * The custom storage path defined by the developer.
     *
     * @var string
     */
    protected $storagePath;

    /**
     * Create a new Flarum application instance.
     *
     * @param string|null $basePath
     * @param string|null $publicPath
     */
    public function __construct($basePath = null, $publicPath = null)
    {
        $this->registerBaseBindings();

        $this->registerBaseServiceProviders();

        $this->registerCoreContainerAliases();

        if ($basePath) {
            $this->setBasePath($basePath);
        }

        if ($publicPath) {
            $this->setPublicPath($publicPath);
        }
    }

    /**
     * Determine if Flarum has been installed.
     *
     * @return bool
     */
    public function isInstalled()
    {
        return $this->bound('flarum.config');
    }

    public function isUpToDate()
    {
        $settings = $this->make('Flarum\Settings\SettingsRepositoryInterface');

        try {
            $version = $settings->get('version');
        } finally {
            $isUpToDate = isset($version) && $version === $this->version();
        }

        return $isUpToDate;
    }

    /**
     * @param string $key
     * @param mixed $default
     * @return mixed
     */
    public function config($key, $default = null)
    {
        return array_get($this->make('flarum.config'), $key, $default);
    }

    /**
     * Check if Flarum is in debug mode.
     *
     * @return bool
     */
    public function inDebugMode()
    {
        return ! $this->isInstalled() || $this->config('debug');
    }

    /**
     * Get the URL to the Flarum installation.
     *
     * @param string $path
     * @return string
     */
    public function url($path = null)
    {
        $config = $this->isInstalled() ? $this->make('flarum.config') : [];
        $url = array_get($config, 'url', $_SERVER['REQUEST_URI']);

        if (is_array($url)) {
            if (isset($url[$path])) {
                return $url[$path];
            }

            $url = $url['base'];
        }

        if ($path) {
            $url .= '/'.array_get($config, "paths.$path", $path);
        }

        return $url;
    }

    /**
     * Get the version number of the application.
     *
     * @return string
     */
    public function version()
    {
        return static::VERSION;
    }

    /**
     * Register the basic bindings into the container.
     */
    protected function registerBaseBindings()
    {
        static::setInstance($this);

        $this->instance('app', $this);

        $this->instance('Illuminate\Container\Container', $this);
    }

    /**
     * Register all of the base service providers.
     */
    protected function registerBaseServiceProviders()
    {
        $this->register(new EventServiceProvider($this));
    }

    /**
     * Set the base path for the application.
     *
     * @param string $basePath
     * @return $this
     */
    public function setBasePath($basePath)
    {
        $this->basePath = rtrim($basePath, '\/');

        $this->bindPathsInContainer();

        return $this;
    }

    /**
     * Set the public path for the application.
     *
     * @param string $publicPath
     * @return $this
     */
    public function setPublicPath($publicPath)
    {
        $this->publicPath = rtrim($publicPath, '\/');

        $this->bindPathsInContainer();

        return $this;
    }

    /**
     * Bind all of the application paths in the container.
     *
     * @return void
     */
    protected function bindPathsInContainer()
    {
        foreach (['base', 'public', 'storage'] as $path) {
            $this->instance('path.'.$path, $this->{$path.'Path'}());
        }
    }

    /**
     * Get the base path of the Laravel installation.
     *
     * @return string
     */
    public function basePath()
    {
        return $this->basePath;
    }

    /**
     * Get the path to the public / web directory.
     *
     * @return string
     */
    public function publicPath()
    {
        return $this->publicPath;
    }

    /**
     * Get the path to the storage directory.
     *
     * @return string
     */
    public function storagePath()
    {
        return $this->storagePath ?: $this->basePath.DIRECTORY_SEPARATOR.'storage';
    }

    /**
     * Set the storage directory.
     *
     * @param string $path
     * @return $this
     */
    public function useStoragePath($path)
    {
        $this->storagePath = $path;

        $this->instance('path.storage', $path);

        return $this;
    }

    /**
     * Get or check the current application environment.
     *
     * @param mixed
     * @return string
     */
    public function environment()
    {
        if (func_num_args() > 0) {
            $patterns = is_array(func_get_arg(0)) ? func_get_arg(0) : func_get_args();

            foreach ($patterns as $pattern) {
                if (Str::is($pattern, $this['env'])) {
                    return true;
                }
            }

            return false;
        }

        return $this['env'];
    }

    /**
     * Determine if we are running in the console.
     *
     * @return bool
     */
    public function runningInConsole()
    {
        return php_sapi_name() == 'cli';
    }

    /**
     * Determine if we are running unit tests.
     *
     * @return bool
     */
    public function runningUnitTests()
    {
        return $this['env'] == 'testing';
    }

    /**
     * Register all of the configured providers.
     *
     * @return void
     */
    public function registerConfiguredProviders()
    {
    }

    /**
     * Register a service provider with the application.
     *
     * @param ServiceProvider|string $provider
     * @param array $options
     * @param bool $force
     * @return ServiceProvider
     */
    public function register($provider, $options = [], $force = false)
    {
        if ($registered = $this->getProvider($provider) && ! $force) {
            return $registered;
        }

        // If the given "provider" is a string, we will resolve it, passing in the
        // application instance automatically for the developer. This is simply
        // a more convenient way of specifying your service provider classes.
        if (is_string($provider)) {
            $provider = $this->resolveProviderClass($provider);
        }

        $provider->register();

        // Once we have registered the service we will iterate through the options
        // and set each of them on the application so they will be available on
        // the actual loading of the service objects and for developer usage.
        foreach ($options as $key => $value) {
            $this[$key] = $value;
        }

        $this->markAsRegistered($provider);

        // If the application has already booted, we will call this boot method on
        // the provider class so it has an opportunity to do its boot logic and
        // will be ready for any usage by the developer's application logics.
        if ($this->booted) {
            $this->bootProvider($provider);
        }

        return $provider;
    }

    /**
     * Get the registered service provider instance if it exists.
     *
     * @param ServiceProvider|string $provider
     * @return ServiceProvider|null
     */
    public function getProvider($provider)
    {
        $name = is_string($provider) ? $provider : get_class($provider);

        return Arr::first($this->serviceProviders, function ($key, $value) use ($name) {
            return $value instanceof $name;
        });
    }

    /**
     * Resolve a service provider instance from the class name.
     *
     * @param string $provider
     * @return ServiceProvider
     */
    public function resolveProviderClass($provider)
    {
        return new $provider($this);
    }

    /**
     * Mark the given provider as registered.
     *
     * @param ServiceProvider $provider
     * @return void
     */
    protected function markAsRegistered($provider)
    {
        $this['events']->fire($class = get_class($provider), [$provider]);

        $this->serviceProviders[] = $provider;

        $this->loadedProviders[$class] = true;
    }

    /**
     * Load and boot all of the remaining deferred providers.
     */
    public function loadDeferredProviders()
    {
        // We will simply spin through each of the deferred providers and register each
        // one and boot them if the application has booted. This should make each of
        // the remaining services available to this application for immediate use.
        foreach ($this->deferredServices as $service => $provider) {
            $this->loadDeferredProvider($service);
        }

        $this->deferredServices = [];
    }

    /**
     * Load the provider for a deferred service.
     *
     * @param string $service
     */
    public function loadDeferredProvider($service)
    {
        if (! isset($this->deferredServices[$service])) {
            return;
        }

        $provider = $this->deferredServices[$service];

        // If the service provider has not already been loaded and registered we can
        // register it with the application and remove the service from this list
        // of deferred services, since it will already be loaded on subsequent.
        if (! isset($this->loadedProviders[$provider])) {
            $this->registerDeferredProvider($provider, $service);
        }
    }

    /**
     * Register a deferred provider and service.
     *
     * @param string $provider
     * @param string $service
     */
    public function registerDeferredProvider($provider, $service = null)
    {
        // Once the provider that provides the deferred service has been registered we
        // will remove it from our local list of the deferred services with related
        // providers so that this container does not try to resolve it out again.
        if ($service) {
            unset($this->deferredServices[$service]);
        }

        $this->register($instance = new $provider($this));

        if (! $this->booted) {
            $this->booting(function () use ($instance) {
                $this->bootProvider($instance);
            });
        }
    }

    /**
     * Resolve the given type from the container.
     *
     * (Overriding Container::make)
     *
     * @param string $abstract
     * @param array $parameters
     * @return mixed
     */
    public function make($abstract, array $parameters = [])
    {
        $abstract = $this->getAlias($abstract);

        if (isset($this->deferredServices[$abstract])) {
            $this->loadDeferredProvider($abstract);
        }

        return parent::make($abstract, $parameters);
    }

    /**
     * Determine if the given abstract type has been bound.
     *
     * (Overriding Container::bound)
     *
     * @param string $abstract
     * @return bool
     */
    public function bound($abstract)
    {
        return isset($this->deferredServices[$abstract]) || parent::bound($abstract);
    }

    /**
     * Determine if the application has booted.
     *
     * @return bool
     */
    public function isBooted()
    {
        return $this->booted;
    }

    /**
     * Boot the application's service providers.
     *
     * @return void
     */
    public function boot()
    {
        if ($this->booted) {
            return;
        }

        // Once the application has booted we will also fire some "booted" callbacks
        // for any listeners that need to do work after this initial booting gets
        // finished. This is useful when ordering the boot-up processes we run.
        $this->fireAppCallbacks($this->bootingCallbacks);

        array_walk($this->serviceProviders, function ($p) {
            $this->bootProvider($p);
        });

        $this->booted = true;

        $this->fireAppCallbacks($this->bootedCallbacks);
    }

    /**
     * Boot the given service provider.
     *
     * @param ServiceProvider $provider
     * @return mixed
     */
    protected function bootProvider(ServiceProvider $provider)
    {
        if (method_exists($provider, 'boot')) {
            return $this->call([$provider, 'boot']);
        }
    }

    /**
     * Register a new boot listener.
     *
     * @param mixed $callback
     * @return void
     */
    public function booting($callback)
    {
        $this->bootingCallbacks[] = $callback;
    }

    /**
     * Register a new "booted" listener.
     *
     * @param mixed $callback
     * @return void
     */
    public function booted($callback)
    {
        $this->bootedCallbacks[] = $callback;

        if ($this->isBooted()) {
            $this->fireAppCallbacks([$callback]);
        }
    }

    /**
     * Call the booting callbacks for the application.
     *
     * @param array $callbacks
     * @return void
     */
    protected function fireAppCallbacks(array $callbacks)
    {
        foreach ($callbacks as $callback) {
            call_user_func($callback, $this);
        }
    }

    /**
     * Get the path to the cached "compiled.php" file.
     *
     * @return string
     */
    public function getCachedCompilePath()
    {
        return $this->basePath().'/bootstrap/cache/compiled.php';
    }

    /**
     * Get the path to the cached services.json file.
     *
     * @return string
     */
    public function getCachedServicesPath()
    {
        return $this->basePath().'/bootstrap/cache/services.json';
    }

    /**
     * Determine if the application is currently down for maintenance.
     *
     * @return bool
     */
    public function isDownForMaintenance()
    {
        return $this->config('offline');
    }

    /**
     * Get the service providers that have been loaded.
     *
     * @return array
     */
    public function getLoadedProviders()
    {
        return $this->loadedProviders;
    }

    /**
     * Get the application's deferred services.
     *
     * @return array
     */
    public function getDeferredServices()
    {
        return $this->deferredServices;
    }

    /**
     * Set the application's deferred services.
     *
     * @param  array  $services
     * @return void
     */
    public function setDeferredServices(array $services)
    {
        $this->deferredServices = $services;
    }

    /**
     * Add an array of services to the application's deferred services.
     *
     * @param  array  $services
     * @return void
     */
    public function addDeferredServices(array $services)
    {
        $this->deferredServices = array_merge($this->deferredServices, $services);
    }

    /**
     * Determine if the given service is a deferred service.
     *
     * @param  string  $service
     * @return bool
     */
    public function isDeferredService($service)
    {
        return isset($this->deferredServices[$service]);
    }

    /**
     * Register the core class aliases in the container.
     */
    public function registerCoreContainerAliases()
    {
        $aliases = [
            'app'                  => ['Flarum\Foundation\Application', 'Illuminate\Contracts\Container\Container', 'Illuminate\Contracts\Foundation\Application'],
            'blade.compiler'       => 'Illuminate\View\Compilers\BladeCompiler',
            'cache'                => ['Illuminate\Cache\CacheManager', 'Illuminate\Contracts\Cache\Factory'],
            'cache.store'          => ['Illuminate\Cache\Repository', 'Illuminate\Contracts\Cache\Repository'],
            'config'               => ['Illuminate\Config\Repository', 'Illuminate\Contracts\Config\Repository'],
            'db'                   => 'Illuminate\Database\DatabaseManager',
            'events'               => ['Illuminate\Events\Dispatcher', 'Illuminate\Contracts\Events\Dispatcher'],
            'files'                => 'Illuminate\Filesystem\Filesystem',
            'filesystem'           => ['Illuminate\Filesystem\FilesystemManager', 'Illuminate\Contracts\Filesystem\Factory'],
            'filesystem.disk'      => 'Illuminate\Contracts\Filesystem\Filesystem',
            'filesystem.cloud'     => 'Illuminate\Contracts\Filesystem\Cloud',
            'hash'                 => 'Illuminate\Contracts\Hashing\Hasher',
            'mailer'               => ['Illuminate\Mail\Mailer', 'Illuminate\Contracts\Mail\Mailer', 'Illuminate\Contracts\Mail\MailQueue'],
            'validator'            => ['Illuminate\Validation\Factory', 'Illuminate\Contracts\Validation\Factory'],
            'view'                 => ['Illuminate\View\Factory', 'Illuminate\Contracts\View\Factory'],
        ];

        foreach ($aliases as $key => $aliases) {
            foreach ((array) $aliases as $alias) {
                $this->alias($key, $alias);
            }
        }
    }

    /**
     * Flush the container of all bindings and resolved instances.
     */
    public function flush()
    {
        parent::flush();

        $this->loadedProviders = [];
    }
}