package org.jetbrains.dokka

import com.google.common.collect.ImmutableMap
import com.intellij.core.CoreApplicationEnvironment
import com.intellij.core.CoreModuleManager
import com.intellij.mock.MockComponentManager
import com.intellij.openapi.Disposable
import com.intellij.openapi.extensions.Extensions
import com.intellij.openapi.module.Module
import com.intellij.openapi.module.ModuleManager
import com.intellij.openapi.project.Project
import com.intellij.openapi.roots.OrderEnumerationHandler
import com.intellij.openapi.roots.ProjectFileIndex
import com.intellij.openapi.roots.ProjectRootManager
import com.intellij.openapi.util.Disposer
import com.intellij.openapi.vfs.StandardFileSystems
import com.intellij.psi.PsiElement
import com.intellij.psi.search.GlobalSearchScope
import com.intellij.util.io.URLUtil
import org.jetbrains.kotlin.analyzer.*
import org.jetbrains.kotlin.caches.resolve.KotlinCacheService
import org.jetbrains.kotlin.cli.common.CLIConfigurationKeys
import org.jetbrains.kotlin.cli.common.messages.MessageCollector
import org.jetbrains.kotlin.cli.jvm.compiler.EnvironmentConfigFiles
import org.jetbrains.kotlin.cli.jvm.compiler.JvmPackagePartProvider
import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
import org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM
import org.jetbrains.kotlin.cli.jvm.config.*
import org.jetbrains.kotlin.cli.jvm.index.JavaRoot
import org.jetbrains.kotlin.config.*
import org.jetbrains.kotlin.container.getService
import org.jetbrains.kotlin.context.ProjectContext
import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
import org.jetbrains.kotlin.descriptors.ModuleDescriptor
import org.jetbrains.kotlin.idea.resolve.ResolutionFacade
import org.jetbrains.kotlin.load.java.structure.impl.JavaClassImpl
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.platform.JvmBuiltIns
import org.jetbrains.kotlin.psi.*
import org.jetbrains.kotlin.resolve.BindingContext
import org.jetbrains.kotlin.resolve.BindingTrace
import org.jetbrains.kotlin.resolve.CompilerEnvironment
import org.jetbrains.kotlin.resolve.diagnostics.Diagnostics
import org.jetbrains.kotlin.resolve.jvm.JvmAnalyzerFacade
import org.jetbrains.kotlin.resolve.jvm.JvmPlatformParameters
import org.jetbrains.kotlin.resolve.jvm.platform.JvmPlatform
import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
import org.jetbrains.kotlin.resolve.lazy.ResolveSession
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.kotlin.util.slicedMap.ReadOnlySlice
import org.jetbrains.kotlin.util.slicedMap.WritableSlice
import java.io.File

/**
 * Kotlin as a service entry point
 *
 * Configures environment, analyses files and provides facilities to perform code processing without emitting bytecode
 *
 * $messageCollector: required by compiler infrastructure and will receive all compiler messages
 * $body: optional and can be used to configure environment without creating local variable
 */
class AnalysisEnvironment(val messageCollector: MessageCollector) : Disposable {
    val configuration = CompilerConfiguration()

    init {
        configuration.put(CLIConfigurationKeys.MESSAGE_COLLECTOR_KEY, messageCollector)
    }

    fun createCoreEnvironment(): KotlinCoreEnvironment {
        System.setProperty("idea.io.use.fallback", "true")
        val environment = KotlinCoreEnvironment.createForProduction(this, configuration, EnvironmentConfigFiles.JVM_CONFIG_FILES)
        val projectComponentManager = environment.project as MockComponentManager

        val projectFileIndex = CoreProjectFileIndex(environment.project,
                environment.configuration.getList(JVMConfigurationKeys.CONTENT_ROOTS))

        val moduleManager = object : CoreModuleManager(environment.project, this) {
            override fun getModules(): Array<out Module> = arrayOf(projectFileIndex.module)
        }

        CoreApplicationEnvironment.registerComponentInstance(projectComponentManager.picoContainer,
                ModuleManager::class.java, moduleManager)

        Extensions.registerAreaClass("IDEA_MODULE", null)
        CoreApplicationEnvironment.registerExtensionPoint(Extensions.getRootArea(),
                OrderEnumerationHandler.EP_NAME, OrderEnumerationHandler.Factory::class.java)

        projectComponentManager.registerService(ProjectFileIndex::class.java,
                projectFileIndex)
        projectComponentManager.registerService(ProjectRootManager::class.java,
                CoreProjectRootManager(projectFileIndex))
        return environment
    }

    fun createSourceModuleSearchScope(project: Project, sourceFiles: List<KtFile>): GlobalSearchScope {
        // TODO: Fix when going to implement dokka for JS
        return TopDownAnalyzerFacadeForJVM.newModuleSearchScope(project, sourceFiles)
    }


    fun createResolutionFacade(environment: KotlinCoreEnvironment): DokkaResolutionFacade {

        val projectContext = ProjectContext(environment.project)
        val sourceFiles = environment.getSourceFiles()


        val library = object : ModuleInfo {
            override val name: Name = Name.special("<library>")
            override fun dependencies(): List<ModuleInfo> = listOf(this)
        }
        val module = object : ModuleInfo {
            override val name: Name = Name.special("<module>")
            override fun dependencies(): List<ModuleInfo> = listOf(this, library)
        }

        val sourcesScope = createSourceModuleSearchScope(environment.project, sourceFiles)

        val builtIns = JvmBuiltIns(projectContext.storageManager)


        val javaRoots = classpath
                .mapNotNull {
                    val rootFile = when {
                        it.extension == "jar" ->
                            StandardFileSystems.jar().findFileByPath("${it.absolutePath}${URLUtil.JAR_SEPARATOR}")
                        else ->
                            StandardFileSystems.local().findFileByPath(it.absolutePath)
                    }

                    rootFile?.let { JavaRoot(it, JavaRoot.RootType.BINARY) }
                }

        val resolverForProject = ResolverForProjectImpl(
            "Dokka",
            projectContext,
            listOf(library, module),
            {
                when (it) {
                    library -> ModuleContent(it, emptyList(), GlobalSearchScope.notScope(sourcesScope))
                    module -> ModuleContent(it, emptyList(), sourcesScope)
                    else -> throw IllegalArgumentException("Unexpected module info")
                }
            },
            {
                JvmPlatform.multiTargetPlatform
            },
            LanguageSettingsProvider.Default /* TODO: Fix this */,
            { JvmAnalyzerFacade },

            JvmPlatformParameters {
                val file = (it as JavaClassImpl).psi.containingFile.virtualFile
                if (file in sourcesScope)
                    module
                else
                    library
            },
            CompilerEnvironment,
            packagePartProviderFactory = { content ->
                JvmPackagePartProvider(configuration.languageVersionSettings, content.moduleContentScope).apply {
                    addRoots(javaRoots)
                }
            },
            builtIns = builtIns
        )

        resolverForProject.resolverForModule(library) // Required before module to initialize library properly
        val resolverForModule = resolverForProject.resolverForModule(module)
        val moduleDescriptor = resolverForProject.descriptorForModule(module)
        builtIns.initialize(moduleDescriptor, true)
        val created = DokkaResolutionFacade(environment.project, moduleDescriptor, resolverForModule)
        val projectComponentManager = environment.project as MockComponentManager
        projectComponentManager.registerService(KotlinCacheService::class.java, CoreKotlinCacheService(created))

        return created
    }

    fun loadLanguageVersionSettings(languageVersionString: String?, apiVersionString: String?) {
        val languageVersion = LanguageVersion.fromVersionString(languageVersionString) ?: LanguageVersion.LATEST_STABLE
        val apiVersion = apiVersionString?.let { ApiVersion.parse(it) } ?: ApiVersion.createByLanguageVersion(languageVersion)
        configuration.languageVersionSettings = LanguageVersionSettingsImpl(languageVersion, apiVersion)
    }

    /**
     * Classpath for this environment.
     */
    val classpath: List<File>
        get() = configuration.jvmClasspathRoots

    /**
     * Adds list of paths to classpath.
     * $paths: collection of files to add
     */
    fun addClasspath(paths: List<File>) {
        configuration.addJvmClasspathRoots(paths)
    }

    /**
     * Adds path to classpath.
     * $path: path to add
     */
    fun addClasspath(path: File) {
        configuration.addJvmClasspathRoot(path)
    }

    /**
     * List of source roots for this environment.
     */
    val sources: List<String>
        get() = configuration.get(JVMConfigurationKeys.CONTENT_ROOTS)
                ?.filterIsInstance<KotlinSourceRoot>()
                ?.map { it.path } ?: emptyList()

    /**
     * Adds list of paths to source roots.
     * $list: collection of files to add
     */
    fun addSources(list: List<String>) {
        list.forEach {
            configuration.addKotlinSourceRoot(it)
            val file = File(it)
            if (file.isDirectory || file.extension == ".java") {
                configuration.addJavaSourceRoot(file)
            }
        }
    }

    fun addRoots(list: List<ContentRoot>) {
        configuration.addAll(JVMConfigurationKeys.CONTENT_ROOTS, list)
    }

    /**
     * Disposes the environment and frees all associated resources.
     */
    override fun dispose() {
        Disposer.dispose(this)
    }
}

fun contentRootFromPath(path: String): ContentRoot {
    val file = File(path)
    return if (file.extension == "java") JavaSourceRoot(file, null) else KotlinSourceRoot(path)
}


class DokkaResolutionFacade(override val project: Project,
                            override val moduleDescriptor: ModuleDescriptor,
                            val resolverForModule: ResolverForModule) : ResolutionFacade {
    override fun analyzeWithAllCompilerChecks(elements: Collection<KtElement>): AnalysisResult {
        throw UnsupportedOperationException()
    }

    override fun <T : Any> tryGetFrontendService(element: PsiElement, serviceClass: Class<T>): T? {
        return null
    }

    override fun resolveToDescriptor(declaration: KtDeclaration, bodyResolveMode: BodyResolveMode): DeclarationDescriptor {
        return resolveSession.resolveToDescriptor(declaration)
    }

    override fun analyze(elements: Collection<KtElement>, bodyResolveMode: BodyResolveMode): BindingContext {
        throw UnsupportedOperationException()
    }

    val resolveSession: ResolveSession get() = getFrontendService(ResolveSession::class.java)

    override fun analyze(element: KtElement, bodyResolveMode: BodyResolveMode): BindingContext {
        if (element is KtDeclaration) {
            val descriptor = resolveToDescriptor(element)
            return object : BindingContext {
                override fun <K : Any?, V : Any?> getKeys(p0: WritableSlice<K, V>?): Collection<K> {
                    throw UnsupportedOperationException()
                }

                override fun getType(p0: KtExpression): KotlinType? {
                    throw UnsupportedOperationException()
                }

                override fun <K : Any?, V : Any?> get(slice: ReadOnlySlice<K, V>?, key: K): V? {
                    if (key != element) {
                        throw UnsupportedOperationException()
                    }
                    return when {
                        slice == BindingContext.DECLARATION_TO_DESCRIPTOR -> descriptor as V
                        slice == BindingContext.PRIMARY_CONSTRUCTOR_PARAMETER && (element as KtParameter).hasValOrVar() -> descriptor as V
                        else -> null
                    }
                }

                override fun getDiagnostics(): Diagnostics {
                    throw UnsupportedOperationException()
                }

                override fun addOwnDataTo(p0: BindingTrace, p1: Boolean) {
                    throw UnsupportedOperationException()
                }

                override fun <K : Any?, V : Any?> getSliceContents(p0: ReadOnlySlice<K, V>): ImmutableMap<K, V> {
                    throw UnsupportedOperationException()
                }

            }
        }
        throw UnsupportedOperationException()
    }

    override fun <T : Any> getFrontendService(element: PsiElement, serviceClass: Class<T>): T {
        throw UnsupportedOperationException()
    }

    override fun <T : Any> getFrontendService(serviceClass: Class<T>): T {
        return resolverForModule.componentProvider.getService(serviceClass)
    }

    override fun <T : Any> getFrontendService(moduleDescriptor: ModuleDescriptor, serviceClass: Class<T>): T {
        return resolverForModule.componentProvider.getService(serviceClass)
    }

    override fun <T : Any> getIdeService(serviceClass: Class<T>): T {
        throw UnsupportedOperationException()
    }

}