package com.reactnativereadium.utils

import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentFactory

/**
 * Creates a [FragmentFactory] for a single type of [Fragment] using the result of the given
 * [factory] closure.
 */
inline fun <reified T : Fragment> createFragmentFactory(crossinline factory: () -> T): FragmentFactory = object : FragmentFactory() {

    override fun instantiate(classLoader: ClassLoader, className: String): Fragment {
        return when (className) {
            T::class.java.name -> factory()
            else -> super.instantiate(classLoader, className)
        }
    }

}

/**
 * A [FragmentFactory] which will iterate over a provided list of [factories] until finding one
 * instantiating successfully the requested [Fragment].
 *
 * ```
 * supportFragmentManager.fragmentFactory = CompositeFragmentFactory(
 *     EpubNavigatorFragment.createFactory(publication, initialLocator, this),
 *     PdfNavigatorFragment.createFactory(publication, initialLocator, this)
 * )
 * ```
 */
class CompositeFragmentFactory(private val factories: List<FragmentFactory>) : FragmentFactory() {

    constructor(vararg factories: FragmentFactory) : this(factories.toList())

    override fun instantiate(classLoader: ClassLoader, className: String): Fragment {
        for (factory in factories) {
            runCatching { factory.instantiate(classLoader, className) }
                .getOrNull()?.let { return it }
        }

        return super.instantiate(classLoader, className)
    }

}