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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.js.config;

import com.google.common.collect.Lists;
import com.intellij.openapi.project.Project;
import com.intellij.util.SmartList;
import kotlin.collections.CollectionsKt;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.config.CommonConfigurationKeys;
import org.jetbrains.kotlin.config.CompilerConfiguration;
import org.jetbrains.kotlin.config.LanguageVersionSettingsImpl;
import org.jetbrains.kotlin.descriptors.PackageFragmentProvider;
import org.jetbrains.kotlin.descriptors.impl.ModuleDescriptorImpl;
import org.jetbrains.kotlin.js.resolve.JsPlatform;
import org.jetbrains.kotlin.name.Name;
import org.jetbrains.kotlin.psi.KtFile;
import org.jetbrains.kotlin.resolve.CompilerDeserializationConfiguration;
import org.jetbrains.kotlin.serialization.js.JsModuleDescriptor;
import org.jetbrains.kotlin.serialization.js.KotlinJavascriptSerializationUtil;
import org.jetbrains.kotlin.serialization.js.ModuleKind;
import org.jetbrains.kotlin.storage.LockBasedStorageManager;
import org.jetbrains.kotlin.utils.JsMetadataVersion;
import org.jetbrains.kotlin.utils.KotlinJavascriptMetadata;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * Base class representing a configuration of translator.
 */
public abstract class JsConfig {
    private final Project project;
    private final CompilerConfiguration configuration;
    private final LockBasedStorageManager storageManager = new LockBasedStorageManager();
    private final List sourceFilesFromLibraries = new SmartList();

    @NotNull
    protected final List metadata = new SmartList();

    @Nullable
    private List> moduleDescriptors = null;

    private boolean initialized = false;

    protected JsConfig(@NotNull Project project, @NotNull CompilerConfiguration configuration) {
        this.project = project;
        this.configuration = configuration;
    }

    @NotNull
    public CompilerConfiguration getConfiguration() {
        return configuration;
    }

    @NotNull
    public Project getProject() {
        return project;
    }

    @NotNull
    public String getModuleId() {
        return configuration.getNotNull(CommonConfigurationKeys.MODULE_NAME);
    }

    @NotNull
    public ModuleKind getModuleKind() {
        return configuration.get(JSConfigurationKeys.MODULE_KIND, ModuleKind.PLAIN);
    }

    public static abstract class Reporter {
        public void error(@NotNull String message) { /*Do nothing*/ }
        public void warning(@NotNull String message) { /*Do nothing*/ }
    }

    public abstract boolean checkLibFilesAndReportErrors(@NotNull Reporter report);

    protected abstract void init(@NotNull List sourceFilesInLibraries, @NotNull List metadata);

    @NotNull
    public List> getModuleDescriptors() {
        init();
        if (moduleDescriptors != null) return moduleDescriptors;

        moduleDescriptors = new SmartList>();
        List kotlinModuleDescriptors = new ArrayList();
        for (KotlinJavascriptMetadata metadataEntry : metadata) {
            JsModuleDescriptor descriptor = createModuleDescriptor(metadataEntry);
            moduleDescriptors.add(descriptor);
            kotlinModuleDescriptors.add(descriptor.getData());
        }

        for (JsModuleDescriptor module : moduleDescriptors) {
            // TODO: remove downcast
            setDependencies(module.getData(), kotlinModuleDescriptors);
        }

        moduleDescriptors = Collections.unmodifiableList(moduleDescriptors);

        return moduleDescriptors;
    }

    @NotNull
    private List getSourceFilesFromLibraries() {
        init();
        return sourceFilesFromLibraries;
    }

    private void init() {
        if (initialized) return;

        init(sourceFilesFromLibraries, metadata);
        initialized = true;
    }

    private JsModuleDescriptor createModuleDescriptor(KotlinJavascriptMetadata metadata) {
        assert metadata.getVersion().isCompatible() :
                "Expected JS metadata version " + JsMetadataVersion.INSTANCE + ", but actual metadata version is " + metadata.getVersion();

        ModuleDescriptorImpl moduleDescriptor = new ModuleDescriptorImpl(
                Name.special("<" + metadata.getModuleName() + ">"), storageManager, JsPlatform.INSTANCE.getBuiltIns()
        );

        JsModuleDescriptor rawDescriptor = KotlinJavascriptSerializationUtil.readModule(
                metadata.getBody(), storageManager, moduleDescriptor, new CompilerDeserializationConfiguration(
                        configuration.get(CommonConfigurationKeys.LANGUAGE_VERSION_SETTINGS, LanguageVersionSettingsImpl.DEFAULT)
                )
        );

        PackageFragmentProvider provider = rawDescriptor.getData();
        moduleDescriptor.initialize(provider != null ? provider : PackageFragmentProvider.Empty.INSTANCE);

        return rawDescriptor.copy(moduleDescriptor);
    }

    private static void setDependencies(ModuleDescriptorImpl module, List modules) {
        module.setDependencies(CollectionsKt.plus(modules, JsPlatform.INSTANCE.getBuiltIns().getBuiltInsModule()));
    }

    @NotNull
    public static Collection withJsLibAdded(@NotNull Collection files, @NotNull JsConfig config) {
        Collection allFiles = Lists.newArrayList();
        allFiles.addAll(files);
        allFiles.addAll(config.getSourceFilesFromLibraries());
        return allFiles;
    }
}