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/*
 *  Copyright 2018 Alexey Andreev.
 *
 *  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
 *
 *       http://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.teavm.dependency;

import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import org.teavm.model.CallLocation;
import org.teavm.model.MethodReference;

class FastVirtualCallConsumer implements DependencyConsumer {
    private final DependencyNode node;
    private final MethodReference methodRef;
    private final DependencyAnalyzer analyzer;
    private final Map callLocations = new LinkedHashMap<>();
    private final Set methods = new LinkedHashSet<>(100, 0.5f);
    final DefaultCallSite callSite;

    FastVirtualCallConsumer(DependencyNode node, MethodReference methodRef, DependencyAnalyzer analyzer) {
        this.node = node;
        this.methodRef = methodRef;
        this.analyzer = analyzer;
        callSite = analyzer.callGraph.getNode(methodRef).getVirtualCallSite();
    }

    @Override
    public void consume(DependencyType type) {
        String className = type.getName();
        if (DependencyAnalyzer.shouldLog) {
            System.out.println("Virtual call of " + methodRef + " detected on " + node.getTag() + ". "
                    + "Target class is " + className);
        }
        if (className.startsWith("[")) {
            className = "java.lang.Object";
        }

        MethodDependency methodDep = analyzer.linkMethod(className, methodRef.getDescriptor());
        if (!methods.add(methodDep)) {
            return;
        }

        DefaultCallGraphNode calledMethodNode = analyzer.callGraph.getNode(methodDep.getReference());
        callSite.calledMethods.add(calledMethodNode);
        calledMethodNode.addCaller(callSite);

        for (CallLocation location : callLocations.values()) {
            methodDep.addLocation(location, false);
        }

        if (!methodDep.isMissing()) {
            methodDep.use();
        }
    }

    void addLocation(CallLocation location) {
        if (callLocations.putIfAbsent(location.getMethod(), location) == null) {
            DefaultCallGraphNode caller = analyzer.callGraph.getNode(location.getMethod());
            caller.addVirtualCallSite(callSite);
            if (location.getSourceLocation() != null) {
                callSite.addLocation(caller, location.getSourceLocation());
            }
            for (MethodDependency method : methods) {
                method.addLocation(location, false);
            }
        }
    }
}