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/*
 * 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.script

import com.intellij.psi.PsiFile
import com.intellij.util.PathUtil
import org.jetbrains.kotlin.descriptors.ScriptDescriptor
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.parsing.KotlinParserDefinition
import org.jetbrains.kotlin.psi.KtScript
import org.jetbrains.kotlin.resolve.descriptorUtil.builtIns
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.kotlin.types.Variance

interface KotlinScriptDefinition {
    fun getScriptParameters(scriptDescriptor: ScriptDescriptor): List
    fun isScript(file: PsiFile): Boolean
    fun getScriptName(script: KtScript): Name
}

class ScriptParameter(val name: Name, val type: KotlinType)

object StandardScriptDefinition : KotlinScriptDefinition {
    private val ARGS_NAME = Name.identifier("args")

    override fun getScriptName(script: KtScript): Name {
        return ScriptNameUtil.fileNameWithExtensionStripped(script, KotlinParserDefinition.STD_SCRIPT_EXT)
    }

    override fun isScript(file: PsiFile): Boolean {
        return PathUtil.getFileExtension(file.name) == KotlinParserDefinition.STD_SCRIPT_SUFFIX
    }

    // NOTE: for now we treat .kts files as if they have 'args: Array' parameter
    // this is not supposed to be final design
    override fun getScriptParameters(scriptDescriptor: ScriptDescriptor): List {
        val builtIns = scriptDescriptor.builtIns
        val arrayOfStrings = builtIns.getArrayType(Variance.INVARIANT, builtIns.stringType)
        return listOf(ScriptParameter(ARGS_NAME, arrayOfStrings))
    }
}