/*
 * ToroDB
 * Copyright © 2014 8Kdata Technology (www.8kdata.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.torodb.standalone;

import com.beust.jcommander.IValueValidator;
import com.beust.jcommander.Parameter;
import com.beust.jcommander.ParameterException;
import com.beust.jcommander.converters.IParameterSplitter;
import com.torodb.packaging.config.model.backend.BackendImplementation;
import com.torodb.standalone.config.model.backend.Backend;

import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;

public class CliConfig {

  @Parameter(names = {"-h", "--help"}, descriptionKey = "help")
  private boolean help = false;
  @Parameter(names = {"-l", "--print-config"}, descriptionKey = "print-config")
  private boolean printConfig = false;
  @Parameter(names = {"-lx", "--print-xml-config"}, descriptionKey = "print-xml-config")
  private boolean printXmlConfig = false;
  @Parameter(names = {"-hp", "--help-param"}, descriptionKey = "help-param")
  private boolean helpParam = false;
  @Parameter(names = {"-c", "--conf"}, descriptionKey = "conf")
  private String confFile;
  @Parameter(names = {"-x", "--xml-conf"}, descriptionKey = "xml-conf")
  private String xmlConfFile;
  @Parameter(names = {"-W", "--ask-for-password"}, descriptionKey = "ask-for-password")
  private boolean askForPassword = false;
  @Parameter(names = {"-b", "--backend"}, descriptionKey = "backend", validateValueWith =
      BackendValueValidator.class)
  private String backend;
  @Parameter(names = {"-p", "--param"}, descriptionKey = "param", validateValueWith =
      ParamValueValidator.class,
      splitter = NoParameterSplitter.class)
  private List<String> params;

  public boolean isHelp() {
    return help;
  }

  public boolean isPrintConfig() {
    return printConfig;
  }

  public boolean isPrintXmlConfig() {
    return printXmlConfig;
  }

  public String getConfFile() {
    return confFile;
  }

  public boolean hasConfFile() {
    return confFile != null;
  }

  public InputStream getConfInputStream() throws Exception {
    return new FileInputStream(confFile);
  }

  public String getXmlConfFile() {
    return xmlConfFile;
  }

  public boolean hasXmlConfFile() {
    return xmlConfFile != null;
  }

  public InputStream getXmlConfInputStream() throws Exception {
    return new FileInputStream(xmlConfFile);
  }

  public boolean isHelpParam() {
    return helpParam;
  }

  public boolean isAskForPassword() {
    return askForPassword;
  }

  public List<String> getParams() {
    return params;
  }

  public String getBackend() {
    return backend;
  }

  public static class ParamValueValidator implements IValueValidator<List<String>> {

    @Override
    public void validate(String name, List<String> value) throws ParameterException {
      for (String param : value) {
        if (param.indexOf('=') == -1) {
          throw new ParameterException("Wrong parameter format: " + param);
        }
      }
    }
  }

  public static Class<? extends BackendImplementation> getBackendClass(String backend) {
    backend = backend.toLowerCase(Locale.US);

    for (Class<? extends BackendImplementation> backendClass : Backend.BACKEND_CLASSES.values()) {
      String backendClassLabel = backendClass.getSimpleName().toLowerCase(Locale.US);
      if (backend.equals(backendClassLabel)) {
        return backendClass;
      }
    }

    return null;
  }

  public static class BackendValueValidator implements IValueValidator<String> {

    @Override
    public void validate(String name, String value) throws ParameterException {
      if (value != null && getBackendClass(value) == null) {
        List<String> possibleValues = new ArrayList<>();
        Iterable<Class<? extends BackendImplementation>> backendClasses = Backend.BACKEND_CLASSES
            .values();
        for (Class<? extends BackendImplementation> backendClass : backendClasses) {
          possibleValues.add(backendClass.getSimpleName().toLowerCase(Locale.US));
        }
        throw new ParameterException("Unknown backend: " + value + " (possible values are: "
            + possibleValues + ")");
      }
    }
  }

  public static class NoParameterSplitter implements IParameterSplitter {

    @Override
    public List<String> split(String value) {
      return Arrays.asList(new String[]{value});
    }
  }
}