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/*
 * Copyright 2016-2022 DiffPlug
 *
 * 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 com.diffplug.gradle.spotless;

import static com.diffplug.spotless.kotlin.KotlinConstants.LICENSE_HEADER_DELIMITER;

import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import java.util.Objects;
import java.util.function.Consumer;

import javax.inject.Inject;

import org.gradle.api.GradleException;
import org.gradle.api.file.FileCollection;
import org.gradle.api.plugins.JavaPluginConvention;
import org.gradle.api.tasks.SourceSet;

import com.diffplug.common.collect.ImmutableSortedMap;
import com.diffplug.spotless.FileSignature;
import com.diffplug.spotless.FormatterStep;
import com.diffplug.spotless.kotlin.DiktatStep;
import com.diffplug.spotless.kotlin.KtLintStep;
import com.diffplug.spotless.kotlin.KtfmtStep;
import com.diffplug.spotless.kotlin.KtfmtStep.KtfmtFormattingOptions;
import com.diffplug.spotless.kotlin.KtfmtStep.Style;

public class KotlinExtension extends FormatExtension implements HasBuiltinDelimiterForLicense {
	static final String NAME = "kotlin";

	@Inject
	public KotlinExtension(SpotlessExtension spotless) {
		super(spotless);
	}

	@Override
	public LicenseHeaderConfig licenseHeader(String licenseHeader) {
		return licenseHeader(licenseHeader, LICENSE_HEADER_DELIMITER);
	}

	@Override
	public LicenseHeaderConfig licenseHeaderFile(Object licenseHeaderFile) {
		return licenseHeaderFile(licenseHeaderFile, LICENSE_HEADER_DELIMITER);
	}

	/** Adds the specified version of ktlint. */
	public KotlinFormatExtension ktlint(String version) {
		Objects.requireNonNull(version);
		return new KotlinFormatExtension(version, false, Collections.emptyMap(), Collections.emptyMap());
	}

	public KotlinFormatExtension ktlint() {
		return ktlint(KtLintStep.defaultVersion());
	}

	public class KotlinFormatExtension {

		private final String version;
		private boolean useExperimental;
		private Map userData;
		private Map editorConfigOverride;

		KotlinFormatExtension(String version, boolean useExperimental, Map config,
				Map editorConfigOverride) {
			this.version = version;
			this.useExperimental = useExperimental;
			this.userData = config;
			this.editorConfigOverride = editorConfigOverride;
			addStep(createStep());
		}

		public KotlinFormatExtension setUseExperimental(boolean useExperimental) {
			this.useExperimental = useExperimental;
			replaceStep(createStep());
			return this;
		}

		public KotlinFormatExtension userData(Map userData) {
			// Copy the map to a sorted map because up-to-date checking is based on binary-equals of the serialized
			// representation.
			this.userData = ImmutableSortedMap.copyOf(userData);
			replaceStep(createStep());
			return this;
		}

		public KotlinFormatExtension editorConfigOverride(Map editorConfigOverride) {
			// Copy the map to a sorted map because up-to-date checking is based on binary-equals of the serialized
			// representation.
			this.editorConfigOverride = ImmutableSortedMap.copyOf(editorConfigOverride);
			replaceStep(createStep());
			return this;
		}

		private FormatterStep createStep() {
			return KtLintStep.create(version, provisioner(), useExperimental, userData, editorConfigOverride);
		}
	}

	/** Uses the ktfmt jar to format source code. */
	public KtfmtConfig ktfmt() {
		return ktfmt(KtfmtStep.defaultVersion());
	}

	/**
	 * Uses the given version of ktfmt and applies the dropbox style
	 * option to format source code.
	 */
	public KtfmtConfig ktfmt(String version) {
		Objects.requireNonNull(version);
		return new KtfmtConfig(version);
	}

	public class KtfmtConfig {
		final String version;
		Style style;
		KtfmtFormattingOptions options;

		private final ConfigurableStyle configurableStyle = new ConfigurableStyle();

		KtfmtConfig(String version) {
			this.version = Objects.requireNonNull(version);
			addStep(createStep());
		}

		private ConfigurableStyle style(Style style) {
			this.style = style;
			replaceStep(createStep());
			return configurableStyle;
		}

		public ConfigurableStyle dropboxStyle() {
			return style(Style.DROPBOX);
		}

		public ConfigurableStyle googleStyle() {
			return style(Style.GOOGLE);
		}

		public ConfigurableStyle kotlinlangStyle() {
			return style(Style.KOTLINLANG);
		}

		public void configure(Consumer optionsConfiguration) {
			this.configurableStyle.configure(optionsConfiguration);
		}

		private FormatterStep createStep() {
			return KtfmtStep.create(version, provisioner(), style, options);
		}

		public class ConfigurableStyle {

			public void configure(Consumer optionsConfiguration) {
				KtfmtFormattingOptions ktfmtFormattingOptions = new KtfmtFormattingOptions();
				optionsConfiguration.accept(ktfmtFormattingOptions);
				options = ktfmtFormattingOptions;
				replaceStep(createStep());
			}
		}
	}

	/** Adds the specified version of diktat. */
	public DiktatFormatExtension diktat(String version) {
		Objects.requireNonNull(version);
		return new DiktatFormatExtension(version);
	}

	public DiktatFormatExtension diktat() {
		return diktat(DiktatStep.defaultVersionDiktat());
	}

	public class DiktatFormatExtension {

		private final String version;
		private FileSignature config;

		DiktatFormatExtension(String version) {
			this.version = version;
			addStep(createStep());
		}

		public DiktatFormatExtension configFile(Object file) throws IOException {
			// Specify the path to the configuration file
			if (file == null) {
				this.config = null;
			} else {
				this.config = FileSignature.signAsList(getProject().file(file));
			}
			replaceStep(createStep());
			return this;
		}

		private FormatterStep createStep() {
			return DiktatStep.create(version, provisioner(), config);
		}
	}

	/** If the user hasn't specified the files yet, we'll assume he/she means all of the kotlin files. */
	@Override
	protected void setupTask(SpotlessTask task) {
		if (target == null) {
			JavaPluginConvention javaPlugin = getProject().getConvention().findPlugin(JavaPluginConvention.class);
			if (javaPlugin == null) {
				throw new GradleException("You must either specify 'target' manually or apply a kotlin plugin.");
			}
			FileCollection union = getProject().files();
			for (SourceSet sourceSet : javaPlugin.getSourceSets()) {
				union = union.plus(sourceSet.getAllSource().filter(file -> {
					String name = file.getName();
					return name.endsWith(".kt") || name.endsWith(".kts");
				}));
			}
			target = union;
		}
		super.setupTask(task);
	}
}