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package org.babyfish.jimmer.sql.cache;

import org.babyfish.jimmer.meta.ImmutableProp;
import org.babyfish.jimmer.meta.ImmutableType;
import org.babyfish.jimmer.meta.TargetLevel;
import org.babyfish.jimmer.sql.JSqlClient;
import org.babyfish.jimmer.sql.event.DatabaseEvent;
import org.babyfish.jimmer.sql.filter.impl.FilterManager;
import org.babyfish.jimmer.sql.runtime.EntityManager;
import org.babyfish.jimmer.sql.event.Triggers;

import java.util.*;

public class CachesImpl implements Caches {

    private final Triggers triggers;

    private final Map> objectCacheMap;

    private final Map> propCacheMap;

    private final CacheOperator operator;

    private final CacheAbandonedCallback abandonedCallback;

    private final boolean disableAll;

    private final Set disabledTypes;

    private final Set disabledProps;

    public CachesImpl(
            Triggers triggers,
            Map> objectCacheMap,
            Map> propCacheMap,
            CacheOperator operator,
            CacheAbandonedCallback abandonedCallback
    ) {
        Map> objectCacheWrapperMap = new LinkedHashMap<>();
        for (Map.Entry> e : objectCacheMap.entrySet()) {
            ImmutableType type = e.getKey();
            objectCacheWrapperMap.put(type, wrapObjectCache(triggers, e.getValue(), operator));
        }
        Map> propCacheWrapperMap = new LinkedHashMap<>();
        for (Map.Entry> e : propCacheMap.entrySet()) {
            ImmutableProp prop = e.getKey();
            propCacheWrapperMap.put(prop, wrapPropCache(triggers, e.getValue(), operator));
        }
        this.triggers = triggers;
        this.objectCacheMap = objectCacheWrapperMap;
        this.propCacheMap = propCacheWrapperMap;
        this.operator = operator;
        this.abandonedCallback = abandonedCallback;
        this.disableAll = false;
        this.disabledTypes = Collections.emptySet();
        this.disabledProps = Collections.emptySet();
    }

    public CachesImpl(
            CachesImpl base,
            CacheDisableConfig cfg
    ) {
        triggers = base.triggers;
        objectCacheMap = base.objectCacheMap;
        propCacheMap = base.propCacheMap;
        operator = base.operator;
        abandonedCallback = base.abandonedCallback;
        disableAll = cfg.isDisableAll();
        disabledTypes = cfg.getDisabledTypes();
        disabledProps = cfg.getDisabledProps();
    }

    public Map> getObjectCacheMap() {
        return Collections.unmodifiableMap(objectCacheMap);
    }

    public Map> getPropCacheMap() {
        return Collections.unmodifiableMap(propCacheMap);
    }

    @SuppressWarnings("unchecked")
    @Override
    public  UsedCache getObjectCache(ImmutableType type) {
        if (disableAll || disabledTypes.contains(type)) {
            return null;
        }
        return UsedCacheImpl.export((UsedCache)objectCacheMap.get(type));
    }

    @SuppressWarnings("unchecked")
    @Override
    public  UsedCache getPropertyCache(ImmutableProp prop) {
        if (!prop.getDeclaringType().isEntity()) {
            throw new IllegalArgumentException("\"" + prop + "\" is not declared in entity");
        }
        if (disableAll ||
                disabledProps.contains(prop) ||
                disabledTypes.contains(prop.getTargetType())
        ) {
            return null;
        }
        return UsedCacheImpl.export((UsedCache) propCacheMap.get(prop));
    }

    @Override
    public CacheAbandonedCallback getAbandonedCallback() {
        return abandonedCallback;
    }

    @Override
    public boolean isAffectedBy(DatabaseEvent e) {
        return (e.getConnection() != null) == triggers.isTransaction();
    }

    @SuppressWarnings("unchecked")
    private UsedCache wrapObjectCache(
            Triggers triggers,
            Cache cache,
            CacheOperator operator
    ) {
        if (cache == null) {
            return null;
        }
        UsedCache wrapper = UsedCacheImpl.wrap(
                (Cache) cache,
                operator
        );
        triggers.addEntityListener(wrapper.type(), e -> {
            if (isAffectedBy(e)) {
                Object id = e.getId();
                wrapper.delete(id, e.getReason());
            }
        });
        return wrapper;
    }

    @SuppressWarnings("unchecked")
    private UsedCache wrapPropCache(
            Triggers triggers,
            Cache cache,
            CacheOperator operator
    ) {
        if (cache == null) {
            return null;
        }
        ImmutableProp prop = cache.prop();
        if (prop == null) {
            throw new IllegalArgumentException("The argument is not property cache");
        }
        if (!prop.getDeclaringType().isEntity()) {
            throw new IllegalArgumentException("\"" + prop + "\" is not declared in entity");
        }
        UsedCache wrapper = UsedCacheImpl.wrap(
                (Cache) cache,
                operator
        );
        if (prop.isAssociation(TargetLevel.PERSISTENT)) {
            triggers.addAssociationListener(prop, e -> {
                if (isAffectedBy(e)) {
                    Object id = e.getSourceId();
                    wrapper.delete(id, e.getReason());
                }
            });
        }
        return wrapper;
    }

    public CacheOperator getOperator() {
        return operator;
    }

    public static Caches of(
            CacheConfig cacheConfig,
            String microServiceName,
            EntityManager entityManager,
            Triggers triggers,
            FilterManager filterManager
    ) {
        return cacheConfig.build(
                microServiceName,
                entityManager,
                triggers,
                filterManager
        );
    }

    public static boolean isEmpty(Caches caches) {
        CachesImpl impl = (CachesImpl) caches;
        return impl.objectCacheMap.isEmpty() && impl.propCacheMap.isEmpty();
    }

    public static void initialize(Caches caches, JSqlClient sqlClient) {
        CachesImpl impl = (CachesImpl) caches;
        CacheOperator operator = impl.operator;
        if (operator != null) {
            operator.initialize(sqlClient);
        }
    }
}