/*
 * MIT License
 *
 * Copyright (c) 2020-present Cloudogu GmbH and Contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package sonia.scm.lifecycle.modules;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.inject.Provider;
import com.google.inject.multibindings.Multibinder;
import com.google.inject.servlet.RequestScoped;
import com.google.inject.servlet.ServletModule;
import com.google.inject.throwingproviders.ThrowingProviderBinder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import sonia.scm.Default;
import sonia.scm.PushStateDispatcher;
import sonia.scm.PushStateDispatcherProvider;
import sonia.scm.Undecorated;
import sonia.scm.api.rest.ObjectMapperProvider;
import sonia.scm.cache.CacheManager;
import sonia.scm.cache.GuavaCacheManager;
import sonia.scm.config.ScmConfiguration;
import sonia.scm.event.ScmEventBus;
import sonia.scm.group.DefaultGroupCollector;
import sonia.scm.group.DefaultGroupDisplayManager;
import sonia.scm.group.DefaultGroupManager;
import sonia.scm.group.GroupCollector;
import sonia.scm.group.GroupDAO;
import sonia.scm.group.GroupDisplayManager;
import sonia.scm.group.GroupManager;
import sonia.scm.group.GroupManagerProvider;
import sonia.scm.group.xml.XmlGroupDAO;
import sonia.scm.migration.MigrationDAO;
import sonia.scm.net.SSLContextProvider;
import sonia.scm.net.ahc.AdvancedHttpClient;
import sonia.scm.net.ahc.ContentTransformer;
import sonia.scm.net.ahc.DefaultAdvancedHttpClient;
import sonia.scm.net.ahc.JsonContentTransformer;
import sonia.scm.net.ahc.XmlContentTransformer;
import sonia.scm.plugin.DefaultPluginManager;
import sonia.scm.plugin.PluginLoader;
import sonia.scm.plugin.PluginManager;
import sonia.scm.repository.DefaultRepositoryManager;
import sonia.scm.repository.DefaultRepositoryProvider;
import sonia.scm.repository.DefaultRepositoryRoleManager;
import sonia.scm.repository.HealthCheckContextListener;
import sonia.scm.repository.NamespaceStrategy;
import sonia.scm.repository.NamespaceStrategyProvider;
import sonia.scm.repository.Repository;
import sonia.scm.repository.RepositoryDAO;
import sonia.scm.repository.RepositoryManager;
import sonia.scm.repository.RepositoryManagerProvider;
import sonia.scm.repository.RepositoryProvider;
import sonia.scm.repository.RepositoryRoleDAO;
import sonia.scm.repository.RepositoryRoleManager;
import sonia.scm.repository.api.HookContextFactory;
import sonia.scm.repository.api.RepositoryServiceFactory;
import sonia.scm.repository.spi.HookEventFacade;
import sonia.scm.repository.xml.XmlRepositoryDAO;
import sonia.scm.repository.xml.XmlRepositoryRoleDAO;
import sonia.scm.schedule.CronScheduler;
import sonia.scm.schedule.Scheduler;
import sonia.scm.security.AccessTokenCookieIssuer;
import sonia.scm.security.AuthorizationChangedEventProducer;
import sonia.scm.security.ConfigurableLoginAttemptHandler;
import sonia.scm.security.DefaultAccessTokenCookieIssuer;
import sonia.scm.security.DefaultSecuritySystem;
import sonia.scm.security.LoginAttemptHandler;
import sonia.scm.security.SecuritySystem;
import sonia.scm.template.MustacheTemplateEngine;
import sonia.scm.template.TemplateEngine;
import sonia.scm.template.TemplateEngineFactory;
import sonia.scm.template.TemplateServlet;
import sonia.scm.update.repository.DefaultMigrationStrategyDAO;
import sonia.scm.user.DefaultUserDisplayManager;
import sonia.scm.user.DefaultUserManager;
import sonia.scm.user.UserDAO;
import sonia.scm.user.UserDisplayManager;
import sonia.scm.user.UserManager;
import sonia.scm.user.UserManagerProvider;
import sonia.scm.user.xml.XmlUserDAO;
import sonia.scm.util.DebugServlet;
import sonia.scm.util.ScmConfigurationUtil;
import sonia.scm.web.UserAgentParser;
import sonia.scm.web.cgi.CGIExecutorFactory;
import sonia.scm.web.cgi.DefaultCGIExecutorFactory;
import sonia.scm.web.filter.LoggingFilter;
import sonia.scm.web.security.AdministrationContext;
import sonia.scm.web.security.DefaultAdministrationContext;

import javax.net.ssl.SSLContext;

/**
 * @author Sebastian Sdorra
 */
class ScmServletModule extends ServletModule {

  private static final String PATTERN_ALL = "/*";
  private static final String PATTERN_DEBUG = "/debug.html";
  private static final String PATTERN_INDEX = "/index.html";
  private static final String SYSTEM_PROPERTY_DEBUG_HTTP = "scm.debug.http";

  private static final Logger logger = LoggerFactory.getLogger(ScmServletModule.class);

  private final ClassOverrides overrides;
  private final PluginLoader pluginLoader;

  ScmServletModule(PluginLoader pluginLoader, ClassOverrides overrides) {
    this.pluginLoader = pluginLoader;
    this.overrides = overrides;
  }

  @Override
  protected void configureServlets() {
    install(ThrowingProviderBinder.forModule(this));

    ScmConfiguration config = getScmConfiguration();

    bind(NamespaceStrategy.class).toProvider(NamespaceStrategyProvider.class);

    // bind repository provider
    ThrowingProviderBinder.create(binder())
      .bind(RepositoryProvider.class, Repository.class)
      .to(DefaultRepositoryProvider.class)
      .in(RequestScoped.class);

    // bind event api
    bind(ScmEventBus.class).toInstance(ScmEventBus.getInstance());

    // bind core
    bind(ScmConfiguration.class).toInstance(config);
    bind(PluginManager.class, DefaultPluginManager.class);

    // bind scheduler
    bind(Scheduler.class).to(CronScheduler.class);

    // bind health check stuff
    bind(HealthCheckContextListener.class);

    // bind extensions
    pluginLoader.getExtensionProcessor().processAutoBindExtensions(binder());

    // bind security stuff
    bind(LoginAttemptHandler.class).to(ConfigurableLoginAttemptHandler.class);
    bind(AuthorizationChangedEventProducer.class);

    bind(SecuritySystem.class).to(DefaultSecuritySystem.class);
    bind(AdministrationContext.class, DefaultAdministrationContext.class);

    // bind cache
    bind(CacheManager.class, GuavaCacheManager.class);
    bind(org.apache.shiro.cache.CacheManager.class, GuavaCacheManager.class);

    // bind dao
    bind(GroupDAO.class, XmlGroupDAO.class);
    bind(UserDAO.class, XmlUserDAO.class);
    bind(RepositoryDAO.class, XmlRepositoryDAO.class);
    bind(RepositoryRoleDAO.class, XmlRepositoryRoleDAO.class);
    bind(RepositoryRoleManager.class).to(DefaultRepositoryRoleManager.class);
    bind(MigrationDAO.class).to(DefaultMigrationStrategyDAO.class);

    bindDecorated(RepositoryManager.class, DefaultRepositoryManager.class,
      RepositoryManagerProvider.class);
    bindDecorated(UserManager.class, DefaultUserManager.class,
      UserManagerProvider.class);
    bind(UserDisplayManager.class, DefaultUserDisplayManager.class);
    bindDecorated(GroupManager.class, DefaultGroupManager.class,
      GroupManagerProvider.class);
    bind(GroupDisplayManager.class, DefaultGroupDisplayManager.class);
    bind(GroupCollector.class, DefaultGroupCollector.class);
    bind(CGIExecutorFactory.class, DefaultCGIExecutorFactory.class);

    // bind sslcontext provider
    bind(SSLContext.class).toProvider(SSLContextProvider.class);

    // bind ahc
    Multibinder<ContentTransformer> transformers =
      Multibinder.newSetBinder(binder(), ContentTransformer.class);
    transformers.addBinding().to(XmlContentTransformer.class);
    transformers.addBinding().to(JsonContentTransformer.class);
    bind(AdvancedHttpClient.class).to(DefaultAdvancedHttpClient.class);

    // bind repository service factory
    bind(RepositoryServiceFactory.class);

    // bind new hook api
    bind(HookContextFactory.class);
    bind(HookEventFacade.class);

    // bind user-agent parser
    bind(UserAgentParser.class);

    // bind debug logging filter
    if ("true".equalsIgnoreCase(System.getProperty(SYSTEM_PROPERTY_DEBUG_HTTP))) {
      filter(PATTERN_ALL).through(LoggingFilter.class);
    }

    // debug servlet
    serve(PATTERN_DEBUG).with(DebugServlet.class);

    // template
    serve(PATTERN_INDEX, "/").with(TemplateServlet.class);

    Multibinder<TemplateEngine> engineBinder =
      Multibinder.newSetBinder(binder(), TemplateEngine.class);

    engineBinder.addBinding().to(MustacheTemplateEngine.class);
    bind(TemplateEngine.class).annotatedWith(Default.class).to(
      MustacheTemplateEngine.class);
    bind(TemplateEngineFactory.class);
    bind(ObjectMapper.class).toProvider(ObjectMapperProvider.class);

    // bind events

    bind(AccessTokenCookieIssuer.class).to(DefaultAccessTokenCookieIssuer.class);
    bind(PushStateDispatcher.class).toProvider(PushStateDispatcherProvider.class);
  }

  private <T> void bind(Class<T> clazz, Class<? extends T> defaultImplementation) {
    Class<? extends T> implementation = find(clazz, defaultImplementation);
    logger.debug("bind {} to {}", clazz, implementation);
    bind(clazz).to(implementation);
  }

  private <T> void bindDecorated(
    Class<T> clazz, Class<? extends T> defaultImplementation, Class<? extends Provider<T>> providerClass
  ) {
    Class<? extends T> implementation = find(clazz, defaultImplementation);

    logger.debug("bind undecorated {} to {}", clazz, implementation);
    bind(clazz).annotatedWith(Undecorated.class).to(implementation);

    logger.debug("bind {} to provider {}", clazz, providerClass);
    bind(clazz).toProvider(providerClass);
  }

  private <T> Class<? extends T> find(Class<T> clazz, Class<? extends T> defaultImplementation) {
    Class<? extends T> implementation = overrides.getOverride(clazz);

    if (implementation != null) {
      logger.info("found override {} for {}", implementation, clazz);
    } else {
      implementation = defaultImplementation;
      logger.trace("no override available for {}, using default implementation {}", clazz, implementation);
    }

    return implementation;
  }

  private ScmConfiguration getScmConfiguration() {
    ScmConfiguration configuration = new ScmConfiguration();
    ScmConfigurationUtil.getInstance().load(configuration);
    return configuration;
  }

}