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package org.openlca.git;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

import org.openlca.jsonld.Json;
import org.openlca.jsonld.JsonStoreReader;
import org.openlca.jsonld.JsonStoreWriter;
import org.openlca.jsonld.LibraryLink;
import org.openlca.jsonld.PackageInfo;
import org.openlca.jsonld.SchemaVersion;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

public record RepositoryInfo(JsonObject json) {

	public static final String FILE_NAME = PackageInfo.FILE_NAME;
	static final int REPOSITORY_CLIENT_VERSION_FALLBACK = 1;
	public static final int REPOSITORY_CURRENT_CLIENT_VERSION = 5;
	public static final List REPOSITORY_SUPPORTED_CLIENT_VERSIONS = Arrays.asList(1, 2, 3, 4, 5);
	static final int REPOSITORY_SERVER_VERSION_FALLBACK = 1;
	public static final int REPOSITORY_CURRENT_SERVER_VERSION = 5;
	public static final List REPOSITORY_SUPPORTED_SERVER_VERSIONS = Arrays.asList(1, 2, 3, 4, 5);

	public static RepositoryInfo of(JsonElement json) {
		var obj = json != null && json.isJsonObject()
				? json.getAsJsonObject()
				: new JsonObject();
		return new RepositoryInfo(obj);
	}

	public static RepositoryInfo create() {
		var json = PackageInfo.create().json();
		Json.put(json, "repositoryClientVersion", REPOSITORY_CURRENT_CLIENT_VERSION);
		Json.put(json, "repositoryServerVersion", REPOSITORY_CURRENT_SERVER_VERSION);
		return new RepositoryInfo(json);
	}

	public static RepositoryInfo readFrom(JsonStoreReader reader) {
		var elem = reader.getJson(FILE_NAME);
		return of(elem);
	}

	public RepositoryInfo merge(RepositoryInfo with) {
		// TODO currently if a library is in one of the commits, it is kept,
		// include this in conflict resolution
		var mergedLibraries = new ArrayList<>(this.libraries());
		mergedLibraries.addAll(with.libraries());
		var merged = RepositoryInfo.create().withLibraries(mergedLibraries);
		merged.withSchemaVersion(SchemaVersion.current());
		merged.withRepositoryClientVersion(
				Math.max(this.repositoryClientVersion(), with.repositoryClientVersion()));
		merged.withRepositoryServerVersion(
				Math.max(this.repositoryServerVersion(), with.repositoryServerVersion()));
		return merged;
	}

	public void writeTo(JsonStoreWriter writer) {
		writer.put(FILE_NAME, json);
	}

	public SchemaVersion schemaVersion() {
		return PackageInfo.of(json).schemaVersion();
	}

	public List libraries() {
		return PackageInfo.of(json).libraries();
	}

	public int repositoryClientVersion() {
		return Json.getInt(json, "repositoryClientVersion", REPOSITORY_CLIENT_VERSION_FALLBACK);
	}

	public int repositoryServerVersion() {
		return Json.getInt(json, "repositoryServerVersion", REPOSITORY_SERVER_VERSION_FALLBACK);
	}

	public RepositoryInfo withLibraries(Collection links) {
		var json = PackageInfo.of(this.json).withLibraries(links).json();
		return of(json);
	}

	public RepositoryInfo withSchemaVersion(SchemaVersion version) {
		var json = PackageInfo.of(this.json).withSchemaVersion(version).json();
		return of(json);
	}

	public RepositoryInfo withRepositoryClientVersion(int version) {
		Json.put(json, "repositoryClientVersion", version);
		return this;
	}

	public RepositoryInfo withRepositoryServerVersion(int version) {
		Json.put(json, "repositoryServerVersion", version);
		return this;
	}

}