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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.tenant;

import com.yahoo.config.provision.TenantName;
import com.yahoo.path.Path;
import com.yahoo.vespa.config.server.ReloadHandler;
import com.yahoo.vespa.config.server.RequestHandler;
import com.yahoo.vespa.config.server.application.TenantApplications;
import com.yahoo.vespa.config.server.deploy.TenantFileSystemDirs;
import com.yahoo.vespa.config.server.session.LocalSessionRepo;
import com.yahoo.vespa.config.server.session.RemoteSessionRepo;
import com.yahoo.vespa.config.server.session.SessionFactory;
import com.yahoo.vespa.curator.Curator;
import org.apache.zookeeper.data.Stat;

import java.time.Instant;
import java.util.Optional;

/**
 * Contains all tenant-level components for a single tenant, dealing with editing sessions and
 * applications for a single tenant.
 *
 * @author vegardh
 * @author lulf
 * @since 5.1.26
 */
public class Tenant implements TenantHandlerProvider {

    public static final String SESSIONS = "sessions";
    public static final String APPLICATIONS = "applications";

    private final TenantName name;
    private final RemoteSessionRepo remoteSessionRepo;
    private final Path path;
    private final SessionFactory sessionFactory;
    private final LocalSessionRepo localSessionRepo;
    private final TenantApplications applicationRepo;
    private final ActivateLock activateLock;
    private final RequestHandler requestHandler;
    private final ReloadHandler reloadHandler;
    private final TenantFileSystemDirs tenantFileSystemDirs;
    private final Curator curator;

    Tenant(TenantName name,
           Path path,
           SessionFactory sessionFactory,
           LocalSessionRepo localSessionRepo,
           RemoteSessionRepo remoteSessionRepo,
           RequestHandler requestHandler,
           ReloadHandler reloadHandler,
           TenantApplications applicationRepo,
           Curator curator,
           TenantFileSystemDirs tenantFileSystemDirs) {
        this.name = name;
        this.path = path;
        this.requestHandler = requestHandler;
        this.reloadHandler = reloadHandler;
        this.remoteSessionRepo = remoteSessionRepo;
        this.sessionFactory = sessionFactory;
        this.localSessionRepo = localSessionRepo;
        this.activateLock = new ActivateLock(curator, path);
        this.applicationRepo = applicationRepo;
        this.tenantFileSystemDirs = tenantFileSystemDirs;
        this.curator = curator;
    }

    /**
     * The reload handler for this
     *
     * @return handler
     */
    public ReloadHandler getReloadHandler() {
        return reloadHandler;
    }

    /**
     * The request handler for this
     *
     * @return handler
     */
    public RequestHandler getRequestHandler() {
        return requestHandler;
    }

    /**
     * The RemoteSessionRepo for this
     *
     * @return repo
     */
    public RemoteSessionRepo getRemoteSessionRepo() {
        return remoteSessionRepo;
    }

    public TenantName getName() {
        return name;
    }

    public Path getPath() {
        return path;
    }

    public SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    public LocalSessionRepo getLocalSessionRepo() {
        return localSessionRepo;
    }

    /**
     * The activation lock for this
     * @return lock
     */
    public ActivateLock getActivateLock() {
        return activateLock;
    }
    
    @Override
    public String toString() {
        return getName().value();
    }

    public TenantApplications getApplicationRepo() {
        return applicationRepo;
    }

    public Curator getCurator() {
        return curator;
    }

    public Instant getCreatedTime() {
        Optional<Stat> stat = curator.getStat(path);
        if (stat.isPresent())
            return Instant.ofEpochMilli(stat.get().getCtime());
        else
            return Instant.now();
    }

    @Override
    public boolean equals(Object other) {
        if (!(other instanceof Tenant)) {
            return false;
        }
        Tenant that = (Tenant) other;
        return name.equals(that.name);
    }

    @Override
    public int hashCode() {
        return name.hashCode();
    }

    /**
     * Closes any watchers, thread pools that may react to changes in tenant state, and removes any state
     * in filesystem and zookeeper
     */
    public void close() {
        tenantFileSystemDirs.delete();
        remoteSessionRepo.close();
        applicationRepo.close();
        localSessionRepo.deleteAllSessions();
        curator.delete(path);
    }

}