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 */
package org.dcache.resilience.data;

import diskCacheV111.pools.PoolV2Mode;

/**
 * <p> Interprets a {@link PoolV2Mode} for potential resilience handling. </p>
 */
public enum PoolStatusForResilience {
    UNINITIALIZED,      // no info yet
    DOWN,               // equivalent to disabled -strict, or dead
    ENABLED,            // equivalent to enabled
    READ_ONLY;          // equivalent to disabled -readOnly

    final static int[] notReadable = { PoolV2Mode.DISABLED_DEAD,
                                       PoolV2Mode.DISABLED_STRICT,
                                       PoolV2Mode.DISABLED_P2P_SERVER,
                                       PoolV2Mode.DISABLED_FETCH };

    final static int[] readable = { PoolV2Mode.DISABLED_P2P_CLIENT,
                                    PoolV2Mode.DISABLED_RDONLY,
                                    PoolV2Mode.DISABLED_STAGE,
                                    PoolV2Mode.DISABLED_STORE };

    /**
     *  @return the status equivalent to the mode.
     */
    public static PoolStatusForResilience getStatusFor(PoolV2Mode poolMode) {
        if (poolMode == null) {
            return UNINITIALIZED;
        }

        PoolStatusForResilience state = READ_ONLY;

        int mode = poolMode.getMode();

        if (poolMode.isEnabled()) {
            state = ENABLED;
        }

        /*
         *  As a precaution, state is normalized explicitly
         *  according to whether the pool is readable and/or writable.
         */
        for (int mask : readable) {
            if ((mode & mask) == mask) {
                state = READ_ONLY;
                break;
            }
        }

        for (int mask : notReadable) {
            if ((mode & mask) == mask) {
                state = DOWN;
                break;
            }
        }

        return state;
    }

    public MessageType getMessageType() {
        switch (this) {
            case DOWN:
            case UNINITIALIZED:
                return MessageType.POOL_STATUS_DOWN;
            default:
                return MessageType.POOL_STATUS_UP;
        }
    }
}