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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.vespa.model.content;

import com.yahoo.documentmodel.NewDocumentType;

import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import static java.util.stream.Collectors.joining;

/**
 * Performs the following validations:
 *  - Verify that all global documents have required redundancy
 *  - Verify that all referred documents are present in services.xml
 *  - Verify that all referred documents are global
 *
 * @author bjorncs
 */
public class GlobalDistributionValidator {

    public void validate(Map documentDefinitions,
                         Set globallyDistributedDocuments) {
        verifyReferredDocumentsArePresent(documentDefinitions);
        verifyReferredDocumentsAreGlobal(documentDefinitions, globallyDistributedDocuments);
    }

    private static void verifyReferredDocumentsArePresent(Map documentDefinitions) {
        Set unknowDocuments = getReferencedDocuments(documentDefinitions)
                .filter(name -> !documentDefinitions.containsKey(name.toString()))
                .collect(Collectors.toCollection(() -> new LinkedHashSet<>()));
        if (!unknowDocuments.isEmpty()) {
            throw new IllegalArgumentException("The following document types are referenced from other documents, " +
                    "but are not listed in services.xml: " + asPrintableString(unknowDocuments.stream()));
        }
    }

    private static void verifyReferredDocumentsAreGlobal(Map documentDefinitions,
                                                         Set globallyDistributedDocuments) {
        Set nonGlobalReferencedDocuments = getReferencedDocuments(documentDefinitions)
                .map(name -> documentDefinitions.get(name.toString()))
                .filter(documentType -> !globallyDistributedDocuments.contains(documentType))
                .collect(Collectors.toCollection(() -> new LinkedHashSet<>()));
        if (!nonGlobalReferencedDocuments.isEmpty()) {
            throw new IllegalArgumentException("The following document types are referenced from other documents, " +
                    "but are not globally distributed: " + asPrintableString(toDocumentNameStream(nonGlobalReferencedDocuments)));
        }
    }

    private static Stream getReferencedDocuments(Map documentDefinitions) {
        return documentDefinitions.values().stream()
                .map(NewDocumentType::getDocumentReferences)
                .flatMap(Set::stream);
    }

    private static Stream toDocumentNameStream(Set globallyDistributedDocuments) {
        return globallyDistributedDocuments.stream().map(NewDocumentType::getFullName);
    }

    private static String asPrintableString(Stream documentTypes) {
        return documentTypes.map(name -> "'" + name + "'").collect(joining(", "));
    }
}