/*
 * Copyright 2010-2015 JetBrains s.r.o.
 *
 * 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.jetbrains.kotlin.idea.configuration

import com.intellij.lang.annotation.AnnotationHolder
import com.intellij.openapi.editor.markup.GutterIconRenderer
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.idea.JetIcons
import org.jetbrains.kotlin.idea.MainFunctionDetector
import org.jetbrains.kotlin.psi.JetNamedFunction
import org.jetbrains.kotlin.psi.JetVisitorVoid
import org.jetbrains.kotlin.resolve.BindingContext
import javax.swing.Icon

class MainFunctionGutterVisitor(val holder: AnnotationHolder, val bindingContext: BindingContext) : JetVisitorVoid() {
    override fun visitNamedFunction(function: JetNamedFunction) {
        if (MainFunctionDetector(bindingContext).isMain(function)) {
            function.nameIdentifier?.let { nameIdentifier ->
                holder.createInfoAnnotation(nameIdentifier, "Run configuration from here").gutterIconRenderer = MainGutterIconRenderer(nameIdentifier)
            }
        }
    }
}

class MainGutterIconRenderer(val nameIdentifier: PsiElement) : GutterIconRenderer() {
    override fun getIcon(): Icon = JetIcons.LAUNCH
    override fun hashCode(): Int = nameIdentifier.hashCode()
    override fun equals(other: Any?): Boolean = other is MainGutterIconRenderer && other.nameIdentifier == nameIdentifier
}