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/*
 * Copyright 2022 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 

 * https://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.openrewrite.remote;

import lombok.EqualsAndHashCode;
import lombok.Value;
import lombok.With;
import org.intellij.lang.annotations.Language;
import org.jspecify.annotations.Nullable;
import org.openrewrite.Checksum;
import org.openrewrite.ExecutionContext;
import org.openrewrite.FileAttributes;
import org.openrewrite.HttpSenderExecutionContextView;
import org.openrewrite.ipc.http.HttpSender;
import org.openrewrite.marker.Markers;

import java.io.IOException;
import java.io.InputStream;
import java.io.UncheckedIOException;
import java.net.URI;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.UUID;

@Value
@EqualsAndHashCode(callSuper = false, onlyExplicitlyIncluded = true)
@With
public class RemoteFile implements Remote {
    @EqualsAndHashCode.Include
    UUID id;

    Path sourcePath;
    Markers markers;
    URI uri;

    @Nullable
    Charset charset;

    boolean charsetBomMarked;

    @Nullable
    FileAttributes fileAttributes;

    @Language("markdown")
    String description;

    @Nullable
    Checksum checksum;

    @Override
    public InputStream getInputStream(ExecutionContext ctx) {
        HttpSender httpSender = HttpSenderExecutionContextView.view(ctx).getLargeFileHttpSender();
        RemoteArtifactCache cache = RemoteExecutionContextView.view(ctx).getArtifactCache();
        try {
            Path localFile = cache.compute(uri, () -> {
                //noinspection resource
                HttpSender.Response response = httpSender.get(uri.toString()).send();
                return response.getBody();
            }, ctx.getOnError());

            if (localFile == null) {
                throw new IllegalStateException("Failed to download " + uri + " to artifact cache");
            }

            return Files.newInputStream(localFile);
        } catch (IOException e) {
            throw new UncheckedIOException("Unable to download " + uri + " to temporary file", e);
        }
    }
}