// Copyright (C) 2009 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.gerrit.pgm.init;

import static com.google.gerrit.extensions.client.GitBasicAuthPolicy.HTTP;
import static com.google.gerrit.extensions.client.GitBasicAuthPolicy.HTTP_LDAP;
import static com.google.gerrit.extensions.client.GitBasicAuthPolicy.LDAP;
import static com.google.gerrit.extensions.client.GitBasicAuthPolicy.OAUTH;
import static com.google.gerrit.pgm.init.api.InitUtil.dnOf;

import com.google.gerrit.extensions.client.AuthType;
import com.google.gerrit.extensions.client.GitBasicAuthPolicy;
import com.google.gerrit.pgm.init.api.ConsoleUI;
import com.google.gerrit.pgm.init.api.InitFlags;
import com.google.gerrit.pgm.init.api.InitStep;
import com.google.gerrit.pgm.init.api.Section;
import com.google.gerrit.server.config.SitePaths;
import com.google.gerrit.server.mail.SignedToken;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.util.EnumSet;

/** Initialize the {@code auth} configuration section. */
@Singleton
class InitAuth implements InitStep {
  private static final String RECEIVE = "receive";
  private static final String ENABLE_SIGNED_PUSH = "enableSignedPush";

  private final ConsoleUI ui;
  private final Section auth;
  private final Section ldap;
  private final Section receive;
  private final InitFlags flags;
  private final SitePaths site;

  @Inject
  InitAuth(InitFlags flags, ConsoleUI ui, final SitePaths site, Section.Factory sections) {
    this.flags = flags;
    this.ui = ui;
    this.site = site;
    this.auth = sections.get("auth", null);
    this.ldap = sections.get("ldap", null);
    this.receive = sections.get(RECEIVE, null);
  }

  @Override
  public void run() {
    ui.header("User Authentication");

    initAuthType();
    if (auth.getSecure("registerEmailPrivateKey") == null) {
      auth.setSecure("registerEmailPrivateKey", SignedToken.generateRandomKey());
    }

    initSignedPush();

    if (site.isNew) {
      initUserNameCaseSensitivity();
    }
  }

  private void initAuthType() {
    AuthType authType =
        auth.select(
            "Authentication method",
            "type",
            flags.dev ? AuthType.DEVELOPMENT_BECOME_ANY_ACCOUNT : AuthType.OPENID);
    switch (authType) {
      case HTTP, HTTP_LDAP -> {
        String hdr = auth.get("httpHeader");
        if (ui.yesno(hdr != null, "Get username from custom HTTP header")) {
          auth.string("Username HTTP header", "httpHeader", "SM_USER");
        } else if (hdr != null) {
          auth.unset("httpHeader");
        }
        auth.string("SSO logout URL", "logoutUrl", null);
      }
      case LDAP ->
          auth.select(
              "Git/HTTP authentication",
              "gitBasicAuthPolicy",
              HTTP,
              EnumSet.of(HTTP, HTTP_LDAP, LDAP));
      case OAUTH -> {
        GitBasicAuthPolicy gitBasicAuth =
            auth.select(
                "Git/HTTP authentication", "gitBasicAuthPolicy", HTTP, EnumSet.of(HTTP, OAUTH));

        if (gitBasicAuth == OAUTH) {
          ui.message(
              "*WARNING* Please make sure that your chosen OAuth provider\n"
                  + "supports Git token authentication.\n");
        }
      }
      case CLIENT_SSL_CERT_LDAP,
          CUSTOM_EXTENSION,
          DEVELOPMENT_BECOME_ANY_ACCOUNT,
          LDAP_BIND,
          OPENID,
          OPENID_SSO -> {}
    }

    switch (authType) {
      case LDAP, LDAP_BIND, HTTP_LDAP -> {
        String server = ldap.string("LDAP server", "server", "ldap://localhost");
        if (server != null //
            && !server.startsWith("ldap://") //
            && !server.startsWith("ldaps://")) {
          if (ui.yesno(false, "Use SSL")) {
            server = "ldaps://" + server;
          } else {
            server = "ldap://" + server;
          }
          ldap.set("server", server);
        }

        ldap.string("LDAP username", "username", null);
        ldap.password("username", "password");

        String aBase = ldap.string("Account BaseDN", "accountBase", dnOf(server));
        ldap.string("Group BaseDN", "groupBase", aBase);
      }
      case CLIENT_SSL_CERT_LDAP,
          CUSTOM_EXTENSION,
          DEVELOPMENT_BECOME_ANY_ACCOUNT,
          HTTP,
          OAUTH,
          OPENID,
          OPENID_SSO -> {}
    }
  }

  private void initSignedPush() {
    boolean def = flags.cfg.getBoolean(RECEIVE, ENABLE_SIGNED_PUSH, false);
    boolean enable = ui.yesno(def, "Enable signed push support");
    receive.set("enableSignedPush", Boolean.toString(enable));
  }

  private void initUserNameCaseSensitivity() {
    boolean enableCaseInsensitivity = ui.yesno(true, "Use case insensitive usernames");
    auth.set("userNameCaseInsensitive", Boolean.toString(enableCaseInsensitivity));
  }
}