package net.curisit.securis.db.common;

import java.util.Date;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.persistence.EntityManager;

import net.curisit.integrity.commons.Utils;
import net.curisit.securis.db.Settings;
import net.curisit.securis.ioc.EntityManagerProvider;

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

@ApplicationScoped
public class SystemParams {

    @SuppressWarnings("unused")
    private static final Logger LOG = LogManager.getLogger(SystemParams.class);

    @Inject
    private EntityManagerProvider emProvider;

    /**
     * Returns the system parameter value for given key
     * 
     * @param key
     * @return the value of the param or null if it doesn't exist
     */
    public String getParam(String key) {
        return getParam(key, null);
    }

    /**
     * Returns the system parameter as int value for given key
     * 
     * @param key
     * @return the value of the param or null if it doesn't exist
     */
    public Integer getParamAsInt(String key) {
        String value = getParam(key, null);
        return value == null ? null : Integer.parseInt(value);
    }

    /**
     * 
     * @param key
     * @param defaulValue
     *            returned if key doesn't exist in params table
     * @return
     */
    public Integer getParamAsInt(String key, Integer defaulValue) {
        String value = getParam(key, null);
        return value == null ? defaulValue : Integer.parseInt(value);
    }

    /**
     * Returns the system parameter as Date value for given key
     * 
     * @param key
     * @return the value of the param or null if it doesn't exist
     */
    public Date getParamAsDate(String key) {
        String value = getParam(key, null);
        return value == null ? null : Utils.toDateFromIso(value);
    }

    /**
     * Returns the system parameter as boolean value for given key
     * 
     * @param key
     * @return the value of the param or null if it doesn't exist
     */
    public Boolean getParamAsBool(String key) {
        String value = getParam(key, null);
        return value == null ? null : Boolean.parseBoolean(value);
    }

    /**
     * 
     * @param key
     * @param defaulValue
     *            returned if key doesn't exist in params table
     * @return
     */
    public Boolean getParamAsBool(String key, boolean defaulValue) {
        String value = getParam(key, null);
        return value == null ? defaulValue : Boolean.parseBoolean(value);
    }

    /**
     * Returns the system parameter as boolean value for given key
     * 
     * @param key
     * @return the value of the param or null if it doesn't exist
     */
    public Double getParamAsDouble(String key) {
        String value = getParam(key, null);
        return value == null ? null : Double.parseDouble(value);
    }

    /**
     * Returns the system parameter value for given key
     * 
     * @param key
     * @param defaultValue
     *            returned if key doesn't exist in params table
     * @return
     */
    public String getParam(String key, String defaultValue) {
        EntityManager em = emProvider.getEntityManager();
        Settings p = em.find(Settings.class, key);
        return p == null ? defaultValue : p.getValue();
    }

    /**
     * Returns the system parameter value passed as parameter to method
     * 
     * @param key
     * @param defaultValue
     * @return
     */
    public void setParam(String key, String value) {
        EntityManager em = emProvider.getEntityManager();
        em.getTransaction().begin();
        try {
            Settings p = em.find(Settings.class, key);

            if (p == null) {
                p = new Settings();
                p.setKey(key);
                p.setValue(value);
                em.persist(p);
            } else {
                p.setValue(value);
                em.merge(p);
            }
            em.flush();
            em.getTransaction().commit();
        } finally {
            em.getTransaction().rollback();
        }
    }

    /**
     * Save a parameter as a Date
     * 
     * @param key
     * @param value
     */
    public void setParam(String key, Date value) {
        setParam(key, Utils.toIsoFormat(value));
    }

    /**
     * Save a parameter as a integer
     * 
     * @param key
     * @param value
     */
    public void setParam(String key, int value) {
        setParam(key, String.valueOf(value));
    }

    /**
     * Save a parameter as a boolean
     * 
     * @param key
     * @param value
     */
    public void setParam(String key, boolean value) {
        setParam(key, String.valueOf(value));
    }

    /**
     * Save a parameter as a double
     * 
     * @param key
     * @param value
     */
    public void setParam(String key, double value) {
        setParam(key, String.valueOf(value));
    }

    /**
     * Remove a parameter from params table
     * 
     * @param key
     * @return
     */
    public void removeParam(String key) {
        EntityManager em = emProvider.getEntityManager();
        em.getTransaction().begin();
        try {
            Settings p = em.find(Settings.class, key);
            if (p != null) {
                em.remove(p);
            }
            em.getTransaction().commit();
        } finally {
            em.getTransaction().rollback();
        }
    }

    public static class Keys {
        // Keys used in basic app
        public static final String CONFIG_CLIENT_HOST = "config.client.host";
        public static final String CONFIG_CLIENT_PORT = "config.client.port";
        public static final String CONFIG_CLIENT_LAST_UPDATE = "config.client.last_update";
        public static final String CONFIG_CLIENT_LICENSE = "config.client.license";
        public static final String CONFIG_CLIENT_MAC = "config.client.mac";
        public static final String CONFIG_CLIENT_MACS = "config.client.macs";
        public static final String CONFIG_CLIENT_CPU_NAME = "config.client.cpu_name";
        public static final String CONFIG_CLIENT_HOURES_AUTO_SYNC = "config.client.houres_auto_sync";
        public static final String CONFIG_CLIENT_HOURES_RETRY_AUTO_SYNC = "config.client.houres_retry_auto_sync";
        public static final String CONFIG_CLIENT_GS_HOST = "config.client.gs_host";
        public static final String CONFIG_CLIENT_GS_PORT = "config.client.gs_port";

        // Keys used in both app
        public static final String CONFIG_COMMON_CUSTOMER_CODE = "config.common.customer_code"; // BP
        public static final String CONFIG_COMMON_CS_CODE = "config.common.cs_code"; // 0000
        public static final String CONFIG_COMMON_USERS_VERSION = "config.common.user_version";
        public static final String CONFIG_COMMON_SETTINGS_VERSION = "config.common.settings_version";
        public static final String CONFIG_COMMON_DATASET_VERSION = "config.common.dataset_version";
        public static final String CONFIG_COMMON_SYNC_TIME_THRESHOLD = "config.common.sync.time_threshols";
        public static final String CONFIG_COMMON_TIMEOUT_SESSION_BA = "config.common.timeout_session_ba";
        public static final String CONFIG_COMMON_TIMEOUT_SESSION_CS = "config.common.timeout_session_cs";

        // Keys used in server app
        public static final String CONFIG_SERVER_LICENSE_EXPIRATION = "config.server.license.expiation";
        public static final String CONFIG_SERVER_MAX_INSTANCES = "config.server.max_instances";
        public static final String CONFIG_SERVER_MAX_USERS = "config.server.max_users";
        public static final String CONFIG_SERVER_LICENSE_MAX_INSTANCES = "config.server.license.max_instances";
        public static final String CONFIG_SERVER_LICENSE_MAX_USERS = "config.server.license.max_users";
        public static final String CONFIG_SERVER_LICENSE_MAX_TIME_THRESHOLD = "config.server.license.max_time_threshols";
        public static final String CONFIG_SERVER_LICENSE_EXTENDED_MODE = "config.server.license.extended_mode";
        public static final String CONFIG_SERVER_LICENSE_MAX_EVENTS = "config.server.license.max_events";
        public static final String CONFIG_SERVER_LICENSE_MAX_WELL_LIFE_LINES = "config.server.license.max_well_life_lines";
        public static final String CONFIG_SERVER_CREATE_DATASET = "config.server.create_dataset_in_next_startup";
        public static final String CONFIG_SERVER_PORT = "config.server.port";
    }

}