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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.schema.derived;

import com.yahoo.config.application.api.FileRegistry;
import com.yahoo.schema.DistributableResource;
import com.yahoo.schema.RankProfile;
import com.yahoo.tensor.TensorType;
import com.yahoo.vespa.config.search.core.RankingConstantsConfig;

import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * Constant values for ranking/model execution tied to a rank profile,
 * to be distributed as files.
 *
 * @author bratseth
 */
public class FileDistributedConstants {

    private final Map constants;

    public FileDistributedConstants(FileRegistry fileRegistry, Collection constants) {
        Map distributableConstants = new LinkedHashMap<>();
        for (var constant : constants) {
            if (constant.valuePath().isEmpty()) continue;

            var distributableConstant = new DistributableConstant(constant.name().simpleArgument().get(),
                                                                  constant.type(),
                                                                  constant.valuePath().get(),
                                                                  constant.pathType().get());
            distributableConstant.validate();
            distributableConstant.register(fileRegistry);
            distributableConstants.put(distributableConstant.getName(), distributableConstant);
        }
        this.constants = Collections.unmodifiableMap(distributableConstants);
    }

    /** Returns a read-only map of the constants in this indexed by name. */
    public Map asMap() { return constants; }

    private static RankingConstantsConfig.Constant.Builder toConfig(DistributableConstant constant) {
        return new RankingConstantsConfig.Constant.Builder()
                .name(constant.getName())
                .fileref(constant.getFileReference())
                .type(constant.getType());
    }

    public List getConfig() {
        return constants.values().stream().map(FileDistributedConstants::toConfig).toList();
    }

    public static class DistributableConstant extends DistributableResource {

        private final TensorType tensorType;

        public DistributableConstant(String name, TensorType type, String fileName, PathType pathType) {
            super(name, fileName, pathType);
            this.tensorType = type;
            validate();
        }

        public TensorType getTensorType() { return tensorType; }
        public String getType() { return tensorType.toString(); }

        public void validate() {
            super.validate();
            if (tensorType == null)
                throw new IllegalArgumentException("Ranking constant '" + getName() + "' must have a type.");
            if (tensorType.dimensions().stream().anyMatch(d -> d.isIndexed() && d.size().isEmpty()))
                throw new IllegalArgumentException("Illegal type in field " + getName() + " type " + tensorType +
                                                   ": Dense tensor dimensions must have a size");
        }

        @Override
        public String toString() {
            return super.toString() + "' of type '" + tensorType + "'";
        }

    }

}