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/*
 *  Copyright 2022 UnitTestBot contributors (utbot.org)
 * 
 *  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.
 */

@file:JvmName("BackwardApplicationGraphs")
package org.jacodb.analysis.graph

import org.jacodb.api.JcClasspath
import org.jacodb.api.JcMethod
import org.jacodb.api.analysis.ApplicationGraph
import org.jacodb.api.analysis.JcApplicationGraph
import org.jacodb.api.cfg.JcInst

private class BackwardApplicationGraph(
    val forward: ApplicationGraph
) : ApplicationGraph {
    override fun predecessors(node: Statement) = forward.successors(node)

    override fun successors(node: Statement) = forward.predecessors(node)

    override fun callees(node: Statement) = forward.callees(node)

    override fun callers(method: Method) = forward.callers(method)

    override fun entryPoint(method: Method) = forward.exitPoints(method)

    override fun exitPoints(method: Method) = forward.entryPoint(method)

    override fun methodOf(node: Statement) = forward.methodOf(node)
}

val  ApplicationGraph.reversed
    get() = if (this is BackwardApplicationGraph) {
        this.forward
    } else {
        BackwardApplicationGraph(this)
    }

private class BackwardJcApplicationGraph(val forward: JcApplicationGraph) :
    JcApplicationGraph, ApplicationGraph by BackwardApplicationGraph(forward) {
    override val classpath: JcClasspath
        get() = forward.classpath
}

val JcApplicationGraph.reversed: JcApplicationGraph
    get() = if (this is BackwardJcApplicationGraph) {
        this.forward
    } else {
        BackwardJcApplicationGraph(this)
    }