/*
 * Copyright @ 2013 CurisTEC, S.A.S. All Rights Reserved.
 */
package net.curisit.securis.services;

import java.net.URI;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import jakarta.enterprise.context.ApplicationScoped;
import jakarta.inject.Inject;
import jakarta.persistence.EntityManager;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.HeaderParam;
import jakarta.ws.rs.POST;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.PathParam;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.QueryParam;
import jakarta.ws.rs.core.Context;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.Response;
import jakarta.ws.rs.core.Response.Status;
import jakarta.ws.rs.core.UriBuilder;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import net.curisit.integrity.AppVersion;
import net.curisit.integrity.commons.Utils;
import net.curisit.securis.ioc.EnsureTransaction;
import net.curisit.securis.security.Securable;
import net.curisit.securis.utils.TokenHelper;

/**
 * BasicServices
 * <p>
 * Minimal public endpoints for service liveness, version info and token checks.
 * Also provides entry routing to SPA (admin/login/licenses) via /index.jsp.
 *
 * Security:
 * <ul>
 *   <li>/check requires a valid bearer token (via {@link Securable}).</li>
 *   <li>/logout just logs intention; token invalidation is outside this class.</li>
 * </ul>
 *
 * Author: roberto &lt;roberto.sanchez@curisit.net&gt;
 * Last reviewed by JRA on Oct 5, 2025.
 */
@Path("/")
@ApplicationScoped
public class BasicServices {

    private static final Logger LOG = LogManager.getLogger(BasicServices.class);

    @Inject TokenHelper tokenHelper;
    @Context EntityManager em;

    @Inject  public BasicServices() {}

    /** 
     * info<p>
     * Simple liveness text endpoint. 
     * 
     * @param request
     * @return response
     */
    @GET
    @Path("/info")
    @Produces({ MediaType.TEXT_PLAIN })
    public Response info(@Context HttpServletRequest request) {
        return Response.ok().entity("License server running OK. Date: " + new Date()).build();
    }

    /** 
     * version<p>
     * Returns semantic app version as JSON. 
     * 
     * @param request
     * @return version
     */
    @GET
    @Path("/version")
    @Produces({ MediaType.APPLICATION_JSON })
    public Map<String, String> version(@Context HttpServletRequest request) {
        Map<String, String> resp = new HashMap<>();
        resp.put("version", AppVersion.getInstance().getCompleteVersion());
        return resp;
    }

    /**
     * init<p>
     * Redirects SPA modules to the main index page.
     * 
     * @param module
     * @param request
     * @return response
     */
    @GET
    @Path("/{module:(admin)|(login)|(licenses)}")
    @Produces({ MediaType.TEXT_HTML })
    public Response init(@PathParam("module") String module, @Context HttpServletRequest request) {
        LOG.info("App index main.html");
        URI uri = UriBuilder.fromUri("/index.jsp").build();
        return Response.seeOther(uri).build();
    }

    /**
     * check<p>
     * Validates a token (from header or query param).
     *
     * @param token X-Token header
     * @param token2 token query param fallback
     * @return 200 with user/date if valid, 401/403 otherwise
     */
    @GET
    @Securable()
    @Path("/check")
    @Produces({ MediaType.APPLICATION_JSON })
    @EnsureTransaction
    public Response check(@HeaderParam(TokenHelper.TOKEN_HEADER_PÀRAM) String token, @QueryParam("token") String token2) {
        if (token == null) token = token2;
        if (token == null) {
            return Response.status(Status.FORBIDDEN).build();
        }
        boolean valid = tokenHelper.isTokenValid(token);
        if (!valid) {
            return Response.status(Status.UNAUTHORIZED).build();
        }

        String user = tokenHelper.extractUserFromToken(token);
        Date date = tokenHelper.extractDateCreationFromToken(token);
        return Response.ok(Utils.createMap("valid", true, "user", user, "date", date)).build();
    }

    /**
     * logout<p>
     * Logs logout event. (Token invalidation is handled elsewhere.)
     * 
     * @param token
     * @return response
     */
    @GET
    @POST
    @Path("/logout")
    @Produces({ MediaType.APPLICATION_JSON })
    public Response logout(@HeaderParam(TokenHelper.TOKEN_HEADER_PÀRAM) String token) {
        if (token == null) {
            Response.status(Status.BAD_REQUEST).build();
        }
        String user = tokenHelper.extractUserFromToken(token);
        LOG.info("User {} has logged out", user);
        return Response.ok().build();
    }
}