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package brooklyn.location.basic;

import static com.google.common.base.Preconditions.checkNotNull;

import java.io.File;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import brooklyn.entity.basic.BrooklynConfigKeys;
import brooklyn.location.Location;
import brooklyn.location.LocationRegistry;
import brooklyn.location.LocationResolver;
import brooklyn.location.LocationSpec;
import brooklyn.management.ManagementContext;
import brooklyn.util.collections.MutableMap;
import brooklyn.util.text.KeyValueParser;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;

/**
 * Examples of valid specs:
 *   
 *     localhost
 *     
localhost:()
 *     
localhost:(name=abc)
 *     
localhost:(name="abc")
 *   
 * 
 * @author alex, aled
 */
public class LocalhostResolver implements LocationResolver {

    private static final Logger log = LoggerFactory.getLogger(LocalhostResolver.class);
    
    public static final String LOCALHOST = "localhost";
    
    private static final Pattern PATTERN = Pattern.compile("("+LOCALHOST+"|"+LOCALHOST.toUpperCase()+")" + "(:\\((.*)\\))?$");
    private static final Set ACCEPTABLE_ARGS = ImmutableSet.of("name");
    
    private ManagementContext managementContext;

    @Override
    public void init(ManagementContext managementContext) {
        this.managementContext = checkNotNull(managementContext, "managementContext");
    }
    
    @Override
    public String getPrefix() {
        return LOCALHOST;
    }

    @Override
    public Location newLocationFromString(Map properties, String spec) {
        return newLocationFromString(spec, null, properties, new MutableMap());
    }
    
    @Override
    public Location newLocationFromString(Map locationFlags, String spec, brooklyn.location.LocationRegistry registry) {
        return newLocationFromString(spec, registry, registry.getProperties(), locationFlags);
    }
    
    protected Location newLocationFromString(String spec, brooklyn.location.LocationRegistry registry, Map properties, Map locationFlags) {
        String namedLocation = (String) locationFlags.get("named");
        
        Matcher matcher = PATTERN.matcher(spec);
        if (!matcher.matches()) {
            throw new IllegalArgumentException("Invalid location '"+spec+"'; must specify something like localhost or localhost(name=abc)");
        }
        
        String argsPart = matcher.group(3);
        Map argsMap = (argsPart != null) ? KeyValueParser.parseMap(argsPart) : Collections.emptyMap();
        String namePart = argsMap.get("name");
        
        if (!ACCEPTABLE_ARGS.containsAll(argsMap.keySet())) {
            Set illegalArgs = Sets.difference(argsMap.keySet(), ACCEPTABLE_ARGS);
            throw new IllegalArgumentException("Invalid location '"+spec+"'; illegal args "+illegalArgs+"; acceptable args are "+ACCEPTABLE_ARGS);
        }
        if (argsMap.containsKey("name") && (namePart == null || namePart.isEmpty())) {
            throw new IllegalArgumentException("Invalid location '"+spec+"'; if name supplied then value must be non-empty");
        }

        Map filteredProperties = new LocalhostPropertiesFromBrooklynProperties().getLocationProperties("localhost", namedLocation, properties);
        MutableMap flags = MutableMap.builder().putAll(filteredProperties).putAll(locationFlags).build();
        
        if (namePart != null) {
            flags.put("name", namePart);
        }
        if (registry != null) {
            String brooklynDataDir = (String) registry.getProperties().get(BrooklynConfigKeys.BROOKLYN_DATA_DIR.getName());
            if (brooklynDataDir != null && brooklynDataDir.length() > 0) {
                flags.put("localTempDir", new File(brooklynDataDir));
            }
        }
        
        return managementContext.getLocationManager().createLocation(LocationSpec.create(LocalhostMachineProvisioningLocation.class)
                .configure(flags));
    }

    @Override
    public boolean accepts(String spec, LocationRegistry registry) {
        return BasicLocationRegistry.isResolverPrefixForSpec(this, spec, true);
    }

}