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/*
 * Copyright 2021 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.json;

import io.micrometer.core.instrument.Metrics;
import io.micrometer.core.instrument.Timer;
import org.antlr.v4.runtime.*;
import org.intellij.lang.annotations.Language;
import org.openrewrite.ExecutionContext;
import org.openrewrite.InMemoryExecutionContext;
import org.openrewrite.Parser;
import org.openrewrite.internal.MetricsHelper;
import org.openrewrite.internal.StringUtils;
import org.openrewrite.internal.lang.Nullable;
import org.openrewrite.json.internal.JsonParserVisitor;
import org.openrewrite.json.internal.grammar.JSON5Lexer;
import org.openrewrite.json.internal.grammar.JSON5Parser;
import org.openrewrite.json.tree.Json;

import java.nio.file.Path;
import java.util.List;
import java.util.Objects;

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

public class JsonParser implements Parser {
    @Override
    public List parseInputs(Iterable sourceFiles, @Nullable Path relativeTo, ExecutionContext ctx) {
        return acceptedInputs(sourceFiles).stream()
                .map(sourceFile -> {
                    Timer.Builder timer = Timer.builder("rewrite.parse")
                            .description("The time spent parsing an Json file")
                            .tag("file.type", "Json");
                    Timer.Sample sample = Timer.start();
                    try {
                        JSON5Parser parser = new JSON5Parser(new CommonTokenStream(new JSON5Lexer(
                                CharStreams.fromStream(sourceFile.getSource()))));

                        parser.removeErrorListeners();
                        parser.addErrorListener(new ForwardingErrorListener(sourceFile.getPath(), ctx));

                        Json.Document document = new JsonParserVisitor(
                                sourceFile.getRelativePath(relativeTo),
                                StringUtils.readFully(sourceFile.getSource())
                        ).visitJson5(parser.json5());
                        sample.stop(MetricsHelper.successTags(timer).register(Metrics.globalRegistry));
                        return document;
                    } catch (Throwable t) {
                        sample.stop(MetricsHelper.errorTags(timer, t).register(Metrics.globalRegistry));
                        ctx.getOnError().accept(new IllegalStateException(sourceFile.getPath() + " " + t.getMessage(), t));
                        return null;
                    }
                })
                .filter(Objects::nonNull)
                .collect(toList());
    }

    @Override
    public List parse(@Language("Json") String... sources) {
        return parse(new InMemoryExecutionContext(), sources);
    }

    @Override
    public boolean accept(Path path) {
        return path.toString().endsWith(".json");
    }

    private static class ForwardingErrorListener extends BaseErrorListener {
        private final Path sourcePath;
        private final ExecutionContext ctx;

        private ForwardingErrorListener(Path sourcePath, ExecutionContext ctx) {
            this.sourcePath = sourcePath;
            this.ctx = ctx;
        }

        @Override
        public void syntaxError(Recognizer recognizer, Object offendingSymbol,
                                int line, int charPositionInLine, String msg, RecognitionException e) {
            ctx.getOnError().accept(new JsonParsingException(sourcePath,
                    String.format("Syntax error in %s at line %d:%d %s.", sourcePath, line, charPositionInLine, msg), e));
        }
    }
}