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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 io.micrometer.tracing.otel.bridge;

import java.util.Objects;
import java.util.concurrent.atomic.AtomicReference;

import io.micrometer.common.lang.Nullable;
import io.micrometer.tracing.TraceContext;
import io.opentelemetry.api.trace.Span;
import io.opentelemetry.api.trace.SpanContext;
import io.opentelemetry.context.Context;
import io.opentelemetry.sdk.trace.ReadableSpan;

/**
 * OpenTelemetry implementation of a {@link TraceContext}.
 *
 * @author Marcin Grzejszczak
 * @since 1.0.0
 */
public class OtelTraceContext implements TraceContext {

    final AtomicReference otelContext;

    final SpanContext delegate;

    final Span span;

    OtelTraceContext(Context context, SpanContext delegate, @Nullable Span span) {
        this(new AtomicReference<>(context == null ? Context.current() : context), delegate, span);
    }

    OtelTraceContext(AtomicReference context, SpanContext delegate, @Nullable Span span) {
        this.otelContext = context;
        this.delegate = delegate;
        this.span = span;
    }

    OtelTraceContext(SpanContext delegate, @Nullable Span span) {
        this.otelContext = context(span);
        this.delegate = delegate;
        this.span = span;
    }

    OtelTraceContext(Span span) {
        this(context(span), span.getSpanContext(), span);
    }

    private static AtomicReference context(Span span) {
        if (span instanceof SpanFromSpanContext) {
            Context contextFromParent = ((SpanFromSpanContext) span).parentTraceContext.context();
            return new AtomicReference<>(contextFromParent);
        }
        return new AtomicReference<>(Context.current());
    }

    /**
     * Converts from OTel to Tracing.
     * @param context OTel version
     * @return Tracing version
     */
    public static TraceContext fromOtel(SpanContext context) {
        return new OtelTraceContext(context, null);
    }

    /**
     * Converts from Tracing to OTel.
     * @param context Tracing version
     * @return OTel Context
     */
    public static Context toOtelContext(TraceContext context) {
        if (context instanceof OtelTraceContext) {
            Span span = ((OtelTraceContext) context).span;
            if (span != null) {
                return span.storeInContext(Context.current());
            }
        }
        return Context.current();
    }

    /**
     * Converts from Tracing to OTel SpanContext.
     * @param context Tracing version
     * @return OTel version
     * @since 1.1.0
     */
    public static SpanContext toOtelSpanContext(TraceContext context) {
        if (context instanceof OtelTraceContext) {
            return ((OtelTraceContext) context).delegate;
        }
        return null;
    }

    @Override
    public String traceId() {
        return this.delegate.getTraceId();
    }

    @Override
    @Nullable
    public String parentId() {
        Span spanContextSpanOrSpan = this.span instanceof SpanFromSpanContext ? ((SpanFromSpanContext) this.span).span
                : this.span;
        if (spanContextSpanOrSpan instanceof ReadableSpan) {
            ReadableSpan readableSpan = (ReadableSpan) spanContextSpanOrSpan;
            return readableSpan.toSpanData().getParentSpanId();
        }
        return null;
    }

    @Override
    public String spanId() {
        return this.delegate.getSpanId();
    }

    @Override
    public Boolean sampled() {
        return this.delegate.isSampled();
    }

    @Override
    public String toString() {
        return this.delegate != null ? this.delegate.toString() : "null";
    }

    Context context() {
        Context ctx = this.otelContext.get();
        return ctx != null ? ctx : Context.root();
    }

    SpanContext spanContext() {
        return this.delegate;
    }

    void updateContext(Context context) {
        this.otelContext.set(context);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        OtelTraceContext otelTraceContext = (OtelTraceContext) o;
        return Objects.equals(this.delegate, otelTraceContext.delegate);
    }

    @Override
    public int hashCode() {
        return Objects.hash(this.delegate);
    }

}