package fr.pandacube.lib.permissions;

import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.OptionalLong;
import java.util.Set;
import java.util.stream.LongStream;

import fr.pandacube.lib.chat.ChatTreeNode;
import fr.pandacube.lib.permissions.PermissionsCachedBackendReader.CachedEntity;
import fr.pandacube.lib.permissions.SQLPermissions.EntityType;
import fr.pandacube.lib.util.Log;

public abstract class PermEntity {
	protected final String name;
	protected final EntityType type;
	protected PermEntity(String n, EntityType t) {
		name = n; type = t;
	}
	
	protected abstract CachedEntity getBackendEntity();
	public abstract List<PermGroup> getInheritances();
	public abstract List<String> getInheritancesString();
	public abstract String getName();
	
	public String getInternalName() {
		return name;
	}
	
	
	/**
	 * Tells if the current entity inherits directly or indirectly from the specified group
	 * @param group the group to search for
	 * @param recursive true to search in the inheritance tree, or false to search only in the inheritance list of the current entity.
	 */
	public boolean inheritsFromGroup(String group, boolean recursive) {
		if (group == null)
			return false;
		return getInheritances().stream().anyMatch(g -> g.name.equals(group) || (recursive && g.inheritsFromGroup(group, true)));
	}
	
	public String getPrefix() {
		return Permissions.resolver.getEffectivePrefix(name, type);
	}
	
	
	public String getSelfPrefix() {
		return getBackendEntity().getSelfPrefix();
	}
	
	
	public ChatTreeNode debugPrefix() {
		return Permissions.resolver.debugPrefix(name, type);
	}
	
	
	public void setSelfPrefix(String prefix) {
		Permissions.backendWriter.setSelfPrefix(name, type, prefix);
	}

	
	public String getSuffix() {
		return Permissions.resolver.getEffectiveSuffix(name, type);
	}
	
	public String getSelfSuffix() {
		return getBackendEntity().getSelfSuffix();
	}
	
	
	public ChatTreeNode debugSuffix() {
		return Permissions.resolver.debugSuffix(name, type);
	}
	
	
	public void setSelfSuffix(String suffix) {
		Permissions.backendWriter.setSelfSuffix(name, type, suffix);
	}
	
	
	public Map<String, Boolean> listEffectivePermissions() {
		return listEffectivePermissions(null, null);
	}
	
	public Map<String, Boolean> listEffectivePermissions(String server) {
		return listEffectivePermissions(server, null);
	}
	
	public Map<String, Boolean> listEffectivePermissions(String server, String world) {
		return Permissions.resolver.getEffectivePermissionList(name, type, server, world);
	}
	
	
	public LongStream getPermissionRangeValues(String permissionPrefix) {
		return getPermissionRangeValues(permissionPrefix, null, null);
	}
	
	public LongStream getPermissionRangeValues(String permissionPrefix, String server) {
		return getPermissionRangeValues(permissionPrefix, server, null);
	}
	
	public LongStream getPermissionRangeValues(String permissionPrefix, String server, String world) {
		String prefixWithEndingDot = permissionPrefix.endsWith(".") ? permissionPrefix : (permissionPrefix + ".");
		int prefixLength = prefixWithEndingDot.length();
		return listEffectivePermissions(server, world).entrySet().stream()
				.filter(Map.Entry::getValue) // permission must be positive
				.map(Map.Entry::getKey) // keep only the permission node (key), since the value is always true
				.filter(p -> p.startsWith(prefixWithEndingDot)) // keep only relevant permissions
				.map(p -> p.substring(prefixLength)) // keep only what is after the prefix
				.map(suffix -> { // convert to long
					try {
						return Long.parseLong(suffix);
					}
					catch (NumberFormatException e) {
						return null;
					}
				})
				.filter(Objects::nonNull)
				.mapToLong(longSuffix -> longSuffix)
				.sorted();
	}
	
	
	public OptionalLong getPermissionRangeMax(String permissionPrefix) {
		return getPermissionRangeMax(permissionPrefix, null, null);
	}

	public OptionalLong getPermissionRangeMax(String permissionPrefix, String server) {
		return getPermissionRangeMax(permissionPrefix, server, null);
	}
	
	public OptionalLong getPermissionRangeMax(String permissionPrefix, String server, String world) {
		return getPermissionRangeValues(permissionPrefix, server, world).max();
	}
	
	
	public Boolean hasPermission(String permission) {
		return hasPermission(permission, null, null);
	}
	
	public Boolean hasPermission(String permission, String server) {
		return hasPermission(permission, server, null);
	}
	
	public Boolean hasPermission(String permission, String server, String world) {
		Boolean ret = Permissions.resolver.getEffectivePermission(name, type, permission, server, world);
		Log.debug("[Perm] For " + type.toString().toLowerCase() + " " + getName() + ", '" + permission + "' is " + ret);
		return ret;
	}
	
	public boolean hasPermissionOr(String permission, String server, String world, boolean deflt) {
		Boolean ret = hasPermission(permission, server, world);
		return ret != null ? ret : deflt;
	}
	
	public boolean hasPermissionExpression(String permExpression, String server, String world) {
		return PermissionExpressionParser.evaluate(permExpression, p -> hasPermissionOr(p, server, world, false));
	}
	
	
	public ChatTreeNode debugPermission(String permission) {
		return debugPermission(permission, null, null);
	}
	
	public ChatTreeNode debugPermission(String permission, String server) {
		return debugPermission(permission, server, null);
	}
	
	public ChatTreeNode debugPermission(String permission, String server, String world) {
		return Permissions.resolver.debugPermission(name, type, permission, server, world);
	}
	
	
	public void addSelfPermission(String permission) {
		addSelfPermission(permission, null, null);
	}
	
	public void addSelfPermission(String permission, String server) {
		addSelfPermission(permission, server, null);
	}
	
	public void addSelfPermission(String permission, String server, String world) {
		Permissions.backendWriter.addSelfPermission(name, type, permission, server, world);
	}
	
	
	public void removeSelfPermission(String permission) {
		removeSelfPermission(permission, null, null);
	}
	
	public void removeSelfPermission(String permission, String server) {
		removeSelfPermission(permission, server, null);
	}
	
	public void removeSelfPermission(String permission, String server, String world) {
		Permissions.backendWriter.removeSelfPermission(name, type, permission, server, world);
	}
	
	public int getSelfPermissionsCount() {
		return getSelfPermissionsServerWorldKeys().stream()
				.mapToInt(key -> getSelfPermissions(key.server, key.world).size())
				.sum();
	}
	
	public Set<ServerWorldKey> getSelfPermissionsServerWorldKeys() {
		return getBackendEntity().getSelfPermissionsServerWorldKeys();
	}
	
	public List<String> getSelfPermissions() {
		return getSelfPermissions(null, null);
	}
	
	public List<String> getSelfPermissions(String server) {
		return getSelfPermissions(server, null);
	}
	
	public List<String> getSelfPermissions(String server, String world) {
		return getBackendEntity().getSelfPermissions(server, world);
	}
	
	
	
	@Override
	public boolean equals(Object obj) {
		return obj instanceof PermEntity o
				&& Objects.equals(name, o.name)
				&& type == o.type;
	}
	
	@Override
	public int hashCode() {
		return Objects.hash(name, type);
	}
	
}