/*
 * Copyright 2010-2017 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.codegen.range

import org.jetbrains.kotlin.codegen.ExpressionCodegen
import org.jetbrains.kotlin.codegen.generateCallReceiver
import org.jetbrains.kotlin.codegen.generateCallSingleArgument
import org.jetbrains.kotlin.codegen.range.comparison.getComparisonGeneratorForKotlinType
import org.jetbrains.kotlin.codegen.range.forLoop.ForInSimpleProgressionLoopGenerator
import org.jetbrains.kotlin.codegen.range.forLoop.ForLoopGenerator
import org.jetbrains.kotlin.descriptors.CallableDescriptor
import org.jetbrains.kotlin.psi.KtForExpression
import org.jetbrains.kotlin.resolve.calls.callUtil.getReceiverExpression
import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall

class PrimitiveNumberUntilRangeValue(rangeCall: ResolvedCall<out CallableDescriptor>) :
    PrimitiveNumberRangeIntrinsicRangeValue(rangeCall), ReversableRangeValue {

    override fun getBoundedValue(codegen: ExpressionCodegen) =
        SimpleBoundedValue(
            codegen.asmType(rangeCall.resultingDescriptor.returnType!!),
            codegen.generateCallReceiver(rangeCall),
            true,
            codegen.generateCallSingleArgument(rangeCall),
            false
        )

    override fun createForLoopGenerator(codegen: ExpressionCodegen, forExpression: KtForExpression) =
        ForInSimpleProgressionLoopGenerator.fromBoundedValueWithStep1(
            codegen, forExpression, getBoundedValue(codegen),
            getComparisonGeneratorForKotlinType(elementKotlinType)
        )

    override fun createForInReversedLoopGenerator(codegen: ExpressionCodegen, forExpression: KtForExpression) =
        createConstBoundedForInReversedUntilGenerator(codegen, forExpression)
            ?: ForInSimpleProgressionLoopGenerator.fromBoundedValueWithStepMinus1(
                codegen, forExpression, getBoundedValue(codegen),
                getComparisonGeneratorForKotlinType(elementKotlinType),
                inverseBoundsEvaluationOrder = true
            )

    private fun createConstBoundedForInReversedUntilGenerator(
        codegen: ExpressionCodegen,
        forExpression: KtForExpression
    ): ForLoopGenerator? {
        val endExpression = rangeCall.getReceiverExpression() ?: return null
        return createConstBoundedForLoopGeneratorOrNull(
            codegen, forExpression,
            codegen.generateCallSingleArgument(rangeCall),
            endExpression,
            step = -1,
            isStartInclusive = false
        )
    }
}