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/*
 * Copyright 2016-2023 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.spotless.maven;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

import com.diffplug.common.base.Errors;
import com.diffplug.common.io.ByteStreams;
import com.diffplug.spotless.Formatter;
import com.diffplug.spotless.PaddedCell;

class IdeHook {

	private static void dumpIsClean() {
		System.err.println("IS CLEAN");
	}

	//No need to check ratchet (using isClean()) as it is performed in Gradle's IDE hook, since we have already gathered the available git files from ratchet.
	static void performHook(Iterable projectFiles, Formatter formatter, String path, boolean spotlessIdeHookUseStdIn, boolean spotlessIdeHookUseStdOut) {
		File file = new File(path);
		if (!file.isAbsolute()) {
			System.err.println("Argument passed to spotlessIdeHook must be an absolute path");
			return;
		}

		if (!projectContainsFile(projectFiles, file)) {
			return;
		}

		try {
			byte[] bytes;
			if (spotlessIdeHookUseStdIn) {
				bytes = ByteStreams.toByteArray(System.in);
			} else {
				bytes = Files.readAllBytes(file.toPath());
			}
			PaddedCell.DirtyState dirty = PaddedCell.calculateDirtyState(formatter, file, bytes);
			if (dirty.isClean()) {
				dumpIsClean();
			} else if (dirty.didNotConverge()) {
				System.err.println("DID NOT CONVERGE");
				System.err.println("See details https://github.com/diffplug/spotless/blob/main/PADDEDCELL.md");
			} else {
				System.err.println("IS DIRTY");
				if (spotlessIdeHookUseStdOut) {
					dirty.writeCanonicalTo(System.out);
				} else {
					dirty.writeCanonicalTo(file);
				}
			}
		} catch (IOException e) {
			e.printStackTrace(System.err);
			throw Errors.asRuntime(e);
		} finally {
			System.err.close();
			System.out.close();
		}
	}

	private static boolean projectContainsFile(Iterable projectFiles, File file) {
		for (File projectFile : projectFiles) {
			if (projectFile.equals(file)) {
				return true;
			}
		}
		return false;
	}
}