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/*

   Copyright 2018-2023 Charles Korn.

   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

       https://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 com.charleskorn.kaml

import kotlinx.serialization.ExperimentalSerializationApi
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.encoding.CompositeDecoder
import kotlinx.serialization.modules.SerializersModule

@OptIn(ExperimentalSerializationApi::class)
internal class YamlMapInput(map: YamlMap, yaml: Yaml, context: SerializersModule, configuration: YamlConfiguration) : YamlMapLikeInputBase(map, yaml, context, configuration) {
    private val entriesList = map.entries.entries.toList()
    private var nextIndex = 0
    private lateinit var currentEntry: Map.Entry

    override fun decodeElementIndex(descriptor: SerialDescriptor): Int {
        if (nextIndex == entriesList.size * 2) {
            return CompositeDecoder.DECODE_DONE
        }

        val entryIndex = nextIndex / 2
        currentEntry = entriesList[entryIndex]
        currentKey = currentEntry.key
        currentlyReadingValue = nextIndex % 2 != 0

        currentValueDecoder = when (currentlyReadingValue) {
            true ->
                try {
                    createFor(currentEntry.value, yaml, serializersModule, configuration, descriptor.getElementDescriptor(1))
                } catch (e: IncorrectTypeException) {
                    throw InvalidPropertyValueException(propertyName, e.message, e.path, e)
                }

            false -> createFor(currentKey, yaml, serializersModule, configuration, descriptor.getElementDescriptor(0))
        }

        return nextIndex++
    }

    override fun beginStructure(descriptor: SerialDescriptor): CompositeDecoder {
        if (haveStartedReadingEntries) {
            return fromCurrentValue { beginStructure(descriptor) }
        }

        return super.beginStructure(descriptor)
    }
}