package io.klask.config;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.servlet.InstrumentedFilter;
import com.codahale.metrics.servlets.MetricsServlet;
import io.klask.web.filter.CachingHttpHeadersFilter;
import io.klask.web.filter.ContextHeaderFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
import org.springframework.boot.context.embedded.MimeMappings;
import org.springframework.boot.web.servlet.ServletContextInitializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

import javax.inject.Inject;
import javax.servlet.*;
import java.io.File;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.EnumSet;

/**
 * Configuration of web application with Servlet 3.0 APIs.
 */
@Configuration
public class WebConfigurer implements ServletContextInitializer, EmbeddedServletContainerCustomizer {

    private final Logger log = LoggerFactory.getLogger(WebConfigurer.class);

    @Inject
    private Environment env;

    @Inject
    private JHipsterProperties jHipsterProperties;

    @Autowired(required = false)
    private MetricRegistry metricRegistry;

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        if (env.getActiveProfiles().length != 0) {
            log.info("Web application configuration, using profiles: {}", Arrays.toString(env.getActiveProfiles()));
        }
        EnumSet<DispatcherType> disps = EnumSet.of(DispatcherType.REQUEST, DispatcherType.FORWARD, DispatcherType.ASYNC);
        initMetrics(servletContext, disps);
        initContextHeader(servletContext, disps);
        if (env.acceptsProfiles(Constants.SPRING_PROFILE_PRODUCTION)) {
            initCachingHttpHeadersFilter(servletContext, disps);
        }
        if (env.acceptsProfiles(Constants.SPRING_PROFILE_DEVELOPMENT)) {
            initH2Console(servletContext);
        }
        log.info("Web application fully configured");
    }

    /**
     * Initialize the ContextHeaderFilter
     *
     * @param servletContext
     * @param disps
     */
    private void initContextHeader(ServletContext servletContext, EnumSet<DispatcherType> disps) {
        log.debug("Registering Context Header Filter");
        FilterRegistration.Dynamic contextHeaderFilter = servletContext.addFilter("contextHeaderFilter",
            new ContextHeaderFilter(jHipsterProperties));

        contextHeaderFilter.addMappingForUrlPatterns(disps, true, "/*");
        contextHeaderFilter.setAsyncSupported(true);
    }

    /**
     * Set up Mime types and, if needed, set the document root.
     */
    @Override
    public void customize(ConfigurableEmbeddedServletContainer container) {
        MimeMappings mappings = new MimeMappings(MimeMappings.DEFAULT);
        // IE issue, see https://github.com/jhipster/generator-jhipster/pull/711
        mappings.add("html", "text/html;charset=utf-8");
        // CloudFoundry issue, see https://github.com/cloudfoundry/gorouter/issues/64
        mappings.add("json", "text/html;charset=utf-8");
        container.setMimeMappings(mappings);

        // When running in an IDE or with ./mvnw spring-boot:run, set location of the static web assets.
        setLocationForStaticAssets(container);
    }

    private void setLocationForStaticAssets(ConfigurableEmbeddedServletContainer container) {
        File root;
        String prefixPath = resolvePathPrefix();
        if (env.acceptsProfiles(Constants.SPRING_PROFILE_PRODUCTION)) {
            root = new File(prefixPath + "target/www/");
        } else {
            root = new File(prefixPath + "src/main/webapp/");
        }
        if (root.exists() && root.isDirectory()) {
            container.setDocumentRoot(root);
        }
    }

    /**
     *  Resolve path prefix to static resources.
     */
    private String resolvePathPrefix() {
        String fullExecutablePath = this.getClass().getResource("").getPath();
        String rootPath = Paths.get(".").toUri().normalize().getPath();
        String extractedPath = fullExecutablePath.replace(rootPath, "");
        int extractionEndIndex = extractedPath.indexOf("target/");
        if(extractionEndIndex <= 0) {
            return "";
        }
        return extractedPath.substring(0, extractionEndIndex);
    }

    /**
     * Initializes the caching HTTP Headers Filter.
     */
    private void initCachingHttpHeadersFilter(ServletContext servletContext,
                                              EnumSet<DispatcherType> disps) {
        log.debug("Registering Caching HTTP Headers Filter");
        FilterRegistration.Dynamic cachingHttpHeadersFilter =
            servletContext.addFilter("cachingHttpHeadersFilter",
                new CachingHttpHeadersFilter(jHipsterProperties));

        cachingHttpHeadersFilter.addMappingForUrlPatterns(disps, true, "/content/*");
        cachingHttpHeadersFilter.addMappingForUrlPatterns(disps, true, "/app/*");
        cachingHttpHeadersFilter.setAsyncSupported(true);
    }

    /**
     * Initializes Metrics.
     */
    private void initMetrics(ServletContext servletContext, EnumSet<DispatcherType> disps) {
        log.debug("Initializing Metrics registries");
        servletContext.setAttribute(InstrumentedFilter.REGISTRY_ATTRIBUTE,
            metricRegistry);
        servletContext.setAttribute(MetricsServlet.METRICS_REGISTRY,
            metricRegistry);

        log.debug("Registering Metrics Filter");
        FilterRegistration.Dynamic metricsFilter = servletContext.addFilter("webappMetricsFilter",
            new InstrumentedFilter());

        metricsFilter.addMappingForUrlPatterns(disps, true, "/*");
        metricsFilter.setAsyncSupported(true);

        log.debug("Registering Metrics Servlet");
        ServletRegistration.Dynamic metricsAdminServlet =
            servletContext.addServlet("metricsServlet", new MetricsServlet());

        metricsAdminServlet.addMapping("/management/jhipster/metrics/*");
        metricsAdminServlet.setAsyncSupported(true);
        metricsAdminServlet.setLoadOnStartup(2);
    }

    @Bean
    @ConditionalOnProperty(name = "jhipster.cors.allowed-origins")
    public CorsFilter corsFilter() {
        log.debug("Registering CORS filter");
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration config = jHipsterProperties.getCors();
        source.registerCorsConfiguration("/api/**", config);
        source.registerCorsConfiguration("/v2/api-docs", config);
        source.registerCorsConfiguration("/oauth/**", config);
        return new CorsFilter(source);
    }

    /**
     * Initializes H2 console.
     */
    private void initH2Console(ServletContext servletContext) {
        log.debug("Initialize H2 console");
        ServletRegistration.Dynamic h2ConsoleServlet = servletContext.addServlet("H2Console", new org.h2.server.web.WebServlet());
        h2ConsoleServlet.addMapping("/h2-console/*");
        h2ConsoleServlet.setInitParameter("-properties", "src/main/resources/");
        h2ConsoleServlet.setLoadOnStartup(1);
    }
}