// 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.sshd.commands;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Function;
import com.google.common.base.Splitter;
import com.google.common.collect.Lists;
import com.google.gerrit.common.data.GlobalCapability;
import com.google.gerrit.extensions.annotations.RequiresCapability;
import com.google.gerrit.extensions.api.GerritApi;
import com.google.gerrit.extensions.api.projects.ProjectInput;
import com.google.gerrit.extensions.api.projects.ProjectInput.ConfigValue;
import com.google.gerrit.extensions.client.InheritableBoolean;
import com.google.gerrit.extensions.client.SubmitType;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.reviewdb.client.AccountGroup;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.server.project.NoSuchProjectException;
import com.google.gerrit.server.project.ProjectControl;
import com.google.gerrit.server.project.SuggestParentCandidates;
import com.google.gerrit.sshd.CommandMetaData;
import com.google.gerrit.sshd.SshCommand;
import com.google.inject.Inject;

import org.kohsuke.args4j.Argument;
import org.kohsuke.args4j.Option;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/** Create a new project. **/
@RequiresCapability(GlobalCapability.CREATE_PROJECT)
@CommandMetaData(name = "create-project", description = "Create a new project and associated Git repository")
final class CreateProjectCommand extends SshCommand {
  @Option(name = "--suggest-parents", aliases = {"-S"}, usage = "suggest parent candidates, "
      + "if this option is used all other options and arguments are ignored")
  private boolean suggestParent;

  @Option(name = "--owner", aliases = {"-o"}, usage = "owner(s) of project")
  private List<AccountGroup.UUID> ownerIds;

  @Option(name = "--parent", aliases = {"-p"}, metaVar = "NAME", usage = "parent project")
  private ProjectControl newParent;

  @Option(name = "--permissions-only", usage = "create project for use only as parent")
  private boolean permissionsOnly;

  @Option(name = "--description", aliases = {"-d"}, metaVar = "DESCRIPTION", usage = "description of project")
  private String projectDescription = "";

  @Option(name = "--submit-type", aliases = {"-t"}, usage = "project submit type")
  private SubmitType submitType;

  @Option(name = "--contributor-agreements", usage = "if contributor agreement is required")
  private InheritableBoolean contributorAgreements = InheritableBoolean.INHERIT;

  @Option(name = "--signed-off-by", usage = "if signed-off-by is required")
  private InheritableBoolean signedOffBy = InheritableBoolean.INHERIT;

  @Option(name = "--content-merge", usage = "allow automatic conflict resolving within files")
  private InheritableBoolean contentMerge = InheritableBoolean.INHERIT;

  @Option(name = "--change-id", usage = "if change-id is required")
  private InheritableBoolean requireChangeID = InheritableBoolean.INHERIT;

  @Option(name = "--new-change-for-all-not-in-target", usage = "if a new change will be created for every commit not in target branch")
  private InheritableBoolean createNewChangeForAllNotInTarget = InheritableBoolean.INHERIT;

  @Option(name = "--use-contributor-agreements", aliases = {"--ca"}, usage = "if contributor agreement is required")
  void setUseContributorArgreements(@SuppressWarnings("unused") boolean on) {
    contributorAgreements = InheritableBoolean.TRUE;
  }

  @Option(name = "--use-signed-off-by", aliases = {"--so"}, usage = "if signed-off-by is required")
  void setUseSignedOffBy(@SuppressWarnings("unused") boolean on) {
    signedOffBy = InheritableBoolean.TRUE;
  }

  @Option(name = "--use-content-merge", usage = "allow automatic conflict resolving within files")
  void setUseContentMerge(@SuppressWarnings("unused") boolean on) {
    contentMerge = InheritableBoolean.TRUE;
  }

  @Option(name = "--require-change-id", aliases = {"--id"}, usage = "if change-id is required")
  void setRequireChangeId(@SuppressWarnings("unused") boolean on) {
    requireChangeID = InheritableBoolean.TRUE;
  }

  @Option(name = "--create-new-change-for-all-not-in-target", aliases = {"--ncfa"},
      usage = "if a new change will be created for every commit not in target branch")
  void setNewChangeForAllNotInTarget(@SuppressWarnings("unused") boolean on) {
    createNewChangeForAllNotInTarget = InheritableBoolean.TRUE;
  }

  @Option(name = "--branch", aliases = {"-b"}, metaVar = "BRANCH", usage = "initial branch name\n"
      + "(default: master)")
  private List<String> branch;

  @Option(name = "--empty-commit", usage = "to create initial empty commit")
  private boolean createEmptyCommit;

  @Option(name = "--max-object-size-limit", usage = "max Git object size for this project")
  private String maxObjectSizeLimit;

  @Option(name = "--plugin-config",
      usage = "plugin configuration parameter with format '<plugin-name>.<parameter-name>=<value>'")
  private List<String> pluginConfigValues;

  @Argument(index = 0, metaVar = "NAME", usage = "name of project to be created")
  private String projectName;

  @Inject
  private GerritApi gApi;

  @Inject
  private SuggestParentCandidates suggestParentCandidates;

  @Override
  protected void run() throws UnloggedFailure {
    try {
      if (!suggestParent) {
        if (projectName == null) {
          throw new UnloggedFailure(1, "fatal: Project name is required.");
        }

        ProjectInput input = new ProjectInput();
        input.name = projectName;
        if (ownerIds != null) {
          input.owners = Lists.transform(ownerIds,
            new Function<AccountGroup.UUID, String>() {
              @Override
              public String apply(AccountGroup.UUID uuid) {
                return uuid.get();
              }
            });
        }
        if (newParent != null) {
          input.parent = newParent.getProject().getName();
        }
        input.permissionsOnly = permissionsOnly;
        input.description = projectDescription;
        input.submitType = submitType;
        input.useContributorAgreements = contributorAgreements;
        input.useSignedOffBy = signedOffBy;
        input.useContentMerge = contentMerge;
        input.requireChangeId = requireChangeID;
        input.createNewChangeForAllNotInTarget = createNewChangeForAllNotInTarget;
        input.branches = branch;
        input.createEmptyCommit = createEmptyCommit;
        input.maxObjectSizeLimit = maxObjectSizeLimit;
        if (pluginConfigValues != null) {
          input.pluginConfigValues = parsePluginConfigValues(pluginConfigValues);
        }

        gApi.projects().create(input);
      } else {
        List<Project.NameKey> parentCandidates =
            suggestParentCandidates.getNameKeys();

        for (Project.NameKey parent : parentCandidates) {
          stdout.print(parent + "\n");
        }
      }
    } catch (RestApiException | NoSuchProjectException err) {
      throw new UnloggedFailure(1, "fatal: " + err.getMessage(), err);
    }
  }

  @VisibleForTesting
  Map<String, Map<String, ConfigValue>> parsePluginConfigValues(
      List<String> pluginConfigValues) throws UnloggedFailure {
    Map<String, Map<String, ConfigValue>> m = new HashMap<>();
    for (String pluginConfigValue : pluginConfigValues) {
      String[] s = pluginConfigValue.split("=");
      String[] s2 = s[0].split("\\.");
      if (s.length != 2 || s2.length != 2) {
        throw new UnloggedFailure(1, "Invalid plugin config value '"
            + pluginConfigValue
            + "', expected format '<plugin-name>.<parameter-name>=<value>'"
            + " or '<plugin-name>.<parameter-name>=<value1,value2,...>'");
      }
      ConfigValue value = new ConfigValue();
      String v = s[1];
      if (v.contains(",")) {
        value.values = Lists.newArrayList(Splitter.on(",").split(v));
      } else {
        value.value = v;
      }
      String pluginName = s2[0];
      String paramName = s2[1];
      Map<String, ConfigValue> l = m.get(pluginName);
      if (l == null) {
        l = new HashMap<>();
        m.put(pluginName, l);
      }
      l.put(paramName, value);
    }
    return m;
  }
}