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An advanced email server - Memory backend with guice injection
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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
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package org.apache.james;

import java.io.File;
import java.util.Optional;

import org.apache.james.data.UsersRepositoryModuleChooser;
import org.apache.james.filesystem.api.FileSystem;
import org.apache.james.filesystem.api.JamesDirectoriesProvider;
import org.apache.james.server.core.JamesServerResourceLoader;
import org.apache.james.server.core.MissingArgumentException;
import org.apache.james.server.core.configuration.Configuration;
import org.apache.james.server.core.configuration.FileConfigurationProvider;
import org.apache.james.server.core.filesystem.FileSystemImpl;

public class MemoryJamesConfiguration implements Configuration {
    public static class Builder {
        private Optional rootDirectory;
        private Optional configurationPath;
        private Optional usersRepositoryImplementation;

        private Builder() {
            rootDirectory = Optional.empty();
            configurationPath = Optional.empty();
            usersRepositoryImplementation = Optional.empty();
        }

        public Builder workingDirectory(String path) {
            rootDirectory = Optional.of(path);
            return this;
        }

        public Builder workingDirectory(File file) {
            rootDirectory = Optional.of(file.getAbsolutePath());
            return this;
        }

        public Builder useWorkingDirectoryEnvProperty() {
            rootDirectory = Optional.ofNullable(System.getProperty(WORKING_DIRECTORY));
            if (!rootDirectory.isPresent()) {
                throw new MissingArgumentException("Server needs a working.directory env entry");
            }
            return this;
        }

        public Builder configurationPath(ConfigurationPath path) {
            configurationPath = Optional.of(path);
            return this;
        }

        public Builder configurationFromClasspath() {
            configurationPath = Optional.of(new ConfigurationPath(FileSystem.CLASSPATH_PROTOCOL));
            return this;
        }

        public Builder usersRepository(UsersRepositoryModuleChooser.Implementation implementation) {
            this.usersRepositoryImplementation = Optional.of(implementation);
            return this;
        }

        public MemoryJamesConfiguration build() {
            ConfigurationPath configurationPath = this.configurationPath.orElse(new ConfigurationPath(FileSystem.FILE_PROTOCOL_AND_CONF));
            JamesServerResourceLoader directories = new JamesServerResourceLoader(rootDirectory
                .orElseThrow(() -> new MissingArgumentException("Server needs a working.directory env entry")));

            FileSystemImpl fileSystem = new FileSystemImpl(directories);

            FileConfigurationProvider configurationProvider = new FileConfigurationProvider(fileSystem, Basic.builder()
                .configurationPath(configurationPath)
                .workingDirectory(directories.getRootDirectory())
                .build());
            UsersRepositoryModuleChooser.Implementation usersRepositoryChoice = usersRepositoryImplementation.orElseGet(
                () -> UsersRepositoryModuleChooser.Implementation.parse(configurationProvider));

            return new MemoryJamesConfiguration(
                configurationPath,
                directories,
                usersRepositoryChoice);
        }
    }

    public static Builder builder() {
        return new Builder();
    }

    private final ConfigurationPath configurationPath;
    private final JamesDirectoriesProvider directories;
    private final UsersRepositoryModuleChooser.Implementation usersRepositoryImplementation;

    public MemoryJamesConfiguration(ConfigurationPath configurationPath, JamesDirectoriesProvider directories, UsersRepositoryModuleChooser.Implementation usersRepositoryImplementation) {
        this.configurationPath = configurationPath;
        this.directories = directories;
        this.usersRepositoryImplementation = usersRepositoryImplementation;
    }

    @Override
    public ConfigurationPath configurationPath() {
        return configurationPath;
    }

    @Override
    public JamesDirectoriesProvider directories() {
        return directories;
    }

    public UsersRepositoryModuleChooser.Implementation getUsersRepositoryImplementation() {
        return usersRepositoryImplementation;
    }
}