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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.

package com.yahoo.vespa.model;

import com.yahoo.config.application.api.DeployLogger;
import com.yahoo.config.provision.NetworkPorts;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.logging.Level;

/**
 * Allocator for network ports on a host
 *
 * @author arnej
 */
public class HostPorts {

    final String hostname;
    public final static int BASE_PORT = 19100;
    final static int MAX_PORTS = 799;

    private DeployLogger deployLogger = (level, message) -> System.err.println("deploy log["+level+"]: "+message);

    private final Map portDB = new LinkedHashMap<>();

    private int allocatedPorts = 0;

    private PortFinder portFinder = new PortFinder(List.of());

    private boolean flushed = false;
    private Optional networkPortsList = Optional.empty();

    public HostPorts(String hostname) {
        this.hostname = hostname;
    }

    /**
     * Get the allocated network ports.
     * Should be called after allocation is complete and flushPortReservations has been called
     */
    public Optional networkPorts() { return networkPortsList; }

    /**
     * Add port allocation from previous deployments.
     * Call this before starting port allocations, to re-use existing ports where possible
     */
    public void addNetworkPorts(NetworkPorts ports) {
        this.networkPortsList = Optional.of(ports);
        this.portFinder = new PortFinder(ports.allocations());
    }

    /**
     * Setup logging in order to send warnings back to the user.
     */
    public void useLogger(DeployLogger logger) {
        this.deployLogger = logger;
    }

    /**
     * Returns the baseport of the first available port range of length numPorts,
     * or 0 if there is no range of that length available.
     * TODO: remove this API
     *
     * @param numPorts the length of the desired port range.
     * @return the baseport of the first available range, or 0 if no range is available.
     */
    int nextAvailableBaseport(int numPorts) {
        int range = 0;
        int port = BASE_PORT;
        for (; port < BASE_PORT + MAX_PORTS && (range < numPorts); port++) {
            if (!isFree(port)) {
                range = 0;
                continue;
            }
            range++;
        }
        return range == numPorts ? port - range : 0;
    }

    private int nextAvailableNetworkPort() {
        int port = BASE_PORT;
        for (; port < BASE_PORT + MAX_PORTS; port++) {
            if (isFree(port)) return port;
        }
        return 0;
    }

    private boolean isFree(int port) {
        return portFinder.isFree(port) && !portDB.containsKey(port);
    }

    /** Allocate a specific port number for a service */
    public int requireNetworkPort(int port, NetworkPortRequestor service, String suffix) {
        reservePort(service, port);
        String servType = service.getServiceType();
        String configId = service.getConfigId();
        portFinder.use(new NetworkPorts.Allocation(port, servType, configId, suffix));
        return port;
    }

    /** Allocate a preferred port number for a service, fall back to using any dynamic port */
    public int wantNetworkPort(int port, NetworkPortRequestor service, String suffix) {
        if (portDB.containsKey(port)) {
            int fallback = nextAvailableNetworkPort();
            NetworkPortRequestor s = portDB.get(port);
            deployLogger.log(Level.WARNING,
                service.getServiceName() +" cannot reserve port " + port + " on " +
                hostname + ": Already reserved for " + s.getServiceName() +
                ". Using default port range from " + fallback);
            return allocateNetworkPort(service, suffix);
        }
        return requireNetworkPort(port, service, suffix);
    }

    /** Allocate a dynamic port number for a service */
    public int allocateNetworkPort(NetworkPortRequestor service, String suffix) {
        String servType = service.getServiceType();
        String configId = service.getConfigId();
        int fallback = nextAvailableNetworkPort();
        int port = portFinder.findPort(new NetworkPorts.Allocation(fallback, servType, configId, suffix), hostname);
        reservePort(service, port);
        portFinder.use(new NetworkPorts.Allocation(port, servType, configId, suffix));
        return port;
    }

    /** Allocate all ports for a service */
    List allocatePorts(NetworkPortRequestor service, int wantedPort) {
        PortAllocBridge allocator = new PortAllocBridge(this, service);
        service.allocatePorts(wantedPort, allocator);
        return allocator.result();
    }

    void deallocatePorts(NetworkPortRequestor service) {
        if (flushed)
            throw new IllegalStateException("Cannot deallocate ports after calling flushPortReservations()");
        portDB.entrySet().removeIf(entry -> entry.getValue().getServiceName().equals(service.getServiceName()));
        allocatedPorts--;
    }

    public void flushPortReservations() {
        this.networkPortsList = Optional.of(new NetworkPorts(portFinder.allocations()));
        this.flushed = true;
    }

    /**
     * Reserves the desired port for the given service, or throws as exception if the port
     * is not available.
     *
     * @param service the service that wishes to reserve the port.
     * @param port the port to be reserved.
     */
    void reservePort(NetworkPortRequestor service, int port) {
        if (portDB.containsKey(port)) {
            portAlreadyReserved(service, port);
        }
        if (inVespasPortRange(port)) {
            allocatedPorts++;
            if (allocatedPorts > MAX_PORTS) {
                noMoreAvailablePorts();
            }
        }
        portDB.put(port, service);
    }

    private boolean inVespasPortRange(int port) {
        return port >= BASE_PORT &&
                port < BASE_PORT + MAX_PORTS;
    }

    private void portAlreadyReserved(NetworkPortRequestor service, int port) {
        NetworkPortRequestor otherService = portDB.get(port);
        int nextAvailablePort = nextAvailableBaseport(service.getPortCount());
        if (nextAvailablePort == 0) {
            noMoreAvailablePorts();
        }
        String msg = (service.getClass().equals(otherService.getClass()) && service.requiresWantedPort())
                ? "You must set port explicitly for all instances of this service type, except the first one. "
                : "";
        throw new IllegalArgumentException(service.getServiceName() + " cannot reserve port " + port +
                                           " on " + hostname + ": Already reserved for " + otherService.getServiceName() +
                                           ". " + msg + "Next available port is: " + nextAvailablePort + " ports used: " + portDB);
    }

    private void noMoreAvailablePorts() {
        throw new RuntimeException
            ("Too many ports are reserved in Vespa's port range (" +
                    BASE_PORT  + ".." + (BASE_PORT+MAX_PORTS) + ") on " + hostname +
                    ". Move one or more services to another host, or outside this port range.");
    }

    @Override
    public String toString() {
        return "HostPorts{"+hostname+"}";
    }

}