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package io.dropwizard.logging.json.layout;

import com.google.common.collect.ImmutableMap;

import javax.annotation.Nullable;
import java.time.Instant;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.Map;
import java.util.Optional;

/**
 * A faster timestamp formatter than the default one in Logback.
 * Also produces timestamps as numbers if the timestamp formatting is disabled.
 */
public class TimestampFormatter {

    private static final Map FORMATTERS = ImmutableMap.builder()
        .put("ISO_LOCAL_DATE", DateTimeFormatter.ISO_LOCAL_DATE)
        .put("ISO_OFFSET_DATE", DateTimeFormatter.ISO_OFFSET_DATE)
        .put("ISO_DATE", DateTimeFormatter.ISO_DATE)
        .put("ISO_LOCAL_TIME", DateTimeFormatter.ISO_LOCAL_TIME)
        .put("ISO_OFFSET_TIME", DateTimeFormatter.ISO_OFFSET_TIME)
        .put("ISO_TIME", DateTimeFormatter.ISO_TIME)
        .put("ISO_LOCAL_DATE_TIME", DateTimeFormatter.ISO_LOCAL_DATE_TIME)
        .put("ISO_OFFSET_DATE_TIME", DateTimeFormatter.ISO_OFFSET_DATE_TIME)
        .put("ISO_ZONED_DATE_TIME", DateTimeFormatter.ISO_ZONED_DATE_TIME)
        .put("ISO_DATE_TIME", DateTimeFormatter.ISO_DATE_TIME)
        .put("ISO_ORDINAL_DATE", DateTimeFormatter.ISO_ORDINAL_DATE)
        .put("ISO_WEEK_DATE", DateTimeFormatter.ISO_WEEK_DATE)
        .put("ISO_INSTANT", DateTimeFormatter.ISO_INSTANT)
        .put("BASIC_ISO_DATE", DateTimeFormatter.BASIC_ISO_DATE)
        .put("RFC_1123_DATE_TIME", DateTimeFormatter.RFC_1123_DATE_TIME)
        .build();

    @Nullable
    private final DateTimeFormatter dateTimeFormatter;

    public TimestampFormatter(@Nullable String timestampFormat, ZoneId zoneId) {
        if (timestampFormat != null) {
            dateTimeFormatter = Optional.ofNullable(FORMATTERS.get(timestampFormat))
                .orElseGet(() -> DateTimeFormatter.ofPattern(timestampFormat))
                .withZone(zoneId);
        } else {
            dateTimeFormatter = null;
        }
    }

    public Object format(long timestamp) {
        return dateTimeFormatter == null ? timestamp : dateTimeFormatter.format(Instant.ofEpochMilli(timestamp));
    }
}