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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.prestosql.spi.security;

import java.security.Principal;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;

import static java.util.Objects.requireNonNull;

public class Identity
{
    private final String user;
    private final Set groups;
    private final Optional principal;
    private final Map roles;
    private final Map extraCredentials;
    private final Optional onDestroy;

    private Identity(
            String user,
            Set groups,
            Optional principal,
            Map roles,
            Map extraCredentials,
            Optional onDestroy)
    {
        this.user = requireNonNull(user, "user is null");
        this.groups = Set.copyOf(requireNonNull(groups, "groups is null"));
        this.principal = requireNonNull(principal, "principal is null");
        this.roles = Map.copyOf(requireNonNull(roles, "roles is null"));
        this.extraCredentials = Map.copyOf(requireNonNull(extraCredentials, "extraCredentials is null"));
        this.onDestroy = requireNonNull(onDestroy, "onDestroy is null");
    }

    public String getUser()
    {
        return user;
    }

    public Set getGroups()
    {
        return groups;
    }

    public Optional getPrincipal()
    {
        return principal;
    }

    public Map getRoles()
    {
        return roles;
    }

    public Map getExtraCredentials()
    {
        return extraCredentials;
    }

    public ConnectorIdentity toConnectorIdentity()
    {
        return ConnectorIdentity.forUser(user)
                .withGroups(groups)
                .withPrincipal(principal)
                .withExtraCredentials(extraCredentials)
                .build();
    }

    public ConnectorIdentity toConnectorIdentity(String catalog)
    {
        return ConnectorIdentity.forUser(user)
                .withGroups(groups)
                .withPrincipal(principal)
                .withRole(Optional.ofNullable(roles.get(catalog)))
                .withExtraCredentials(extraCredentials)
                .build();
    }

    public void destroy()
    {
        onDestroy.ifPresent(Runnable::run);
    }

    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        Identity identity = (Identity) o;
        return Objects.equals(user, identity.user);
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(user);
    }

    @Override
    public String toString()
    {
        StringBuilder sb = new StringBuilder("Identity{");
        sb.append("user='").append(user).append('\'');
        sb.append(", groups=").append(groups);
        principal.ifPresent(principal -> sb.append(", principal=").append(principal));
        sb.append(", roles=").append(roles);
        sb.append(", extraCredentials=").append(extraCredentials.keySet());
        sb.append('}');
        return sb.toString();
    }

    public static Identity ofUser(String user)
    {
        return new Builder(user).build();
    }

    public static Builder forUser(String user)
    {
        return new Builder(user);
    }

    public static Builder from(Identity identity)
    {
        return new Builder(identity.getUser())
                .withGroups(identity.getGroups())
                .withPrincipal(identity.getPrincipal())
                .withRoles(identity.getRoles())
                .withExtraCredentials(identity.getExtraCredentials());
    }

    public static class Builder
    {
        private String user;
        private Set groups = new HashSet<>();
        private Optional principal = Optional.empty();
        private Map roles = new HashMap<>();
        private Map extraCredentials = new HashMap<>();
        private Optional onDestroy = Optional.empty();

        public Builder(String user)
        {
            this.user = requireNonNull(user, "user is null");
        }

        public Builder withUser(String user)
        {
            this.user = requireNonNull(user, "user is null");
            return this;
        }

        public Builder withPrincipal(Principal principal)
        {
            return withPrincipal(Optional.of(requireNonNull(principal, "principal is null")));
        }

        public Builder withPrincipal(Optional principal)
        {
            this.principal = requireNonNull(principal, "principal is null");
            return this;
        }

        public Builder withRole(String catalog, SelectedRole role)
        {
            requireNonNull(catalog, "catalog is null");
            requireNonNull(role, "role is null");
            if (this.roles.put(catalog, role) != null) {
                throw new IllegalStateException("There is already role set for " + catalog);
            }
            return this;
        }

        public Builder withRoles(Map roles)
        {
            this.roles = new HashMap<>(requireNonNull(roles, "roles is null"));
            return this;
        }

        public Builder withAdditionalRoles(Map roles)
        {
            this.roles.putAll(requireNonNull(roles, "roles is null"));
            return this;
        }

        public Builder withExtraCredentials(Map extraCredentials)
        {
            this.extraCredentials = new HashMap<>(requireNonNull(extraCredentials, "extraCredentials is null"));
            return this;
        }

        public Builder withAdditionalExtraCredentials(Map extraCredentials)
        {
            this.extraCredentials.putAll(requireNonNull(extraCredentials, "extraCredentials is null"));
            return this;
        }

        public void withOnDestroy(Runnable onDestroy)
        {
            requireNonNull(onDestroy, "onDestroy is null");
            if (this.onDestroy.isPresent()) {
                throw new IllegalStateException("Destroy callback already set");
            }
            this.onDestroy = Optional.of(new InvokeOnceRunnable(onDestroy));
        }

        public Builder withGroups(Set groups)
        {
            this.groups = new HashSet<>(requireNonNull(groups, "groups is null"));
            return this;
        }

        public Builder withAdditionalGroups(Set groups)
        {
            this.groups.addAll(requireNonNull(groups, "groups is null"));
            return this;
        }

        public Identity build()
        {
            return new Identity(user, groups, principal, roles, extraCredentials, onDestroy);
        }
    }

    private static final class InvokeOnceRunnable
            implements Runnable
    {
        private final Runnable delegate;
        private final AtomicBoolean invoked = new AtomicBoolean();

        public InvokeOnceRunnable(Runnable delegate)
        {
            this.delegate = requireNonNull(delegate, "delegate is null");
        }

        @Override
        public void run()
        {
            if (invoked.compareAndSet(false, true)) {
                delegate.run();
            }
        }
    }
}