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package dev.jbang.dependencies;

import static dev.jbang.Settings.CP_SEPARATOR;
import static dev.jbang.Settings.getJBangLocalMavenRepoOverride;
import static dev.jbang.util.Util.errorMsg;
import static dev.jbang.util.Util.infoMsg;
import static dev.jbang.util.Util.verboseMsg;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

import dev.jbang.cli.ExitException;

public class DependencyUtil {

	public static final String ALIAS_JITPACK = "jitpack";
	public static final String REPO_JITPACK = "https://jitpack.io/";

	private static final Map aliasToRepos;

	static {
		aliasToRepos = new HashMap<>();
		aliasToRepos.put("mavencentral", "https://repo1.maven.org/maven2/"); // deprecated; kept for backwards
																				// compatability
		aliasToRepos.put("central", "https://repo1.maven.org/maven2/"); // deprecated; kept for backwards compatability
		aliasToRepos.put("jbossorg", "https://repository.jboss.org/nexus/content/groups/public/");
		aliasToRepos.put("redhat", "https://maven.repository.redhat.com/ga/");
		aliasToRepos.put("jcenter", "https://jcenter.bintray.com/");
		aliasToRepos.put("google", "https://maven.google.com/");
		aliasToRepos.put(ALIAS_JITPACK, REPO_JITPACK);
		aliasToRepos.put("sponge", "https://repo.spongepowered.org/maven");
		aliasToRepos.put("sonatype-snapshots", "https://oss.sonatype.org/content/repositories/snapshots");
		aliasToRepos.put("s01sonatype-snapshots", "https://s01.oss.sonatype.org/content/repositories/snapshots");
		aliasToRepos.put("spring-snapshot", "https://repo.spring.io/snapshot");
		aliasToRepos.put("spring-milestone", "https://repo.spring.io/milestone");

	}

	public static final Pattern fullGavPattern = Pattern.compile(
			"^(?[a-zA-Z0-9_.-]*):(?[a-zA-Z0-9_.-]*):(?[^:@]*)(:(?[^@]*))?(@(?.*))?$");

	public static final Pattern lenientGavPattern = Pattern.compile(
			"^(?[a-zA-Z0-9_.-]*):(?[a-zA-Z0-9_.-]*)(:(?[^:@]*)(:(?[^@]*))?)?(@(?.*))?$");

	private DependencyUtil() {
	}

	public static ModularClassPath resolveDependencies(List deps, List repos,
			boolean offline, boolean updateCache, boolean loggingEnabled, boolean downloadSources) {

		// if no dependencies were provided we stop here
		if (deps.isEmpty()) {
			return new ModularClassPath(Collections.emptyList());
		}

		verboseMsg(String.format("Resolving artifact(s): %s", String.join(", ", deps)));

		if (repos.isEmpty()) {
			repos = new ArrayList<>();
			repos.add(toMavenRepo("central"));
		}

		// Turn any URL dependencies into regular GAV coordinates
		List depIds = deps
									.stream()
									.map(JitPackUtil::ensureGAV)
									.collect(Collectors.toList());
		// And if we encountered URLs let's make sure the JitPack repo is available
		if (!depIds.equals(deps) && repos.stream().noneMatch(r -> REPO_JITPACK.equals(r.getUrl()))) {
			repos.add(toMavenRepo(ALIAS_JITPACK));
		}

		verboseMsg(String.format("Repositories: %s",
				repos.stream().map(MavenRepo::toString).collect(Collectors.joining(", "))));

		String depsHash = String.join(CP_SEPARATOR, depIds);

		List cachedDeps = null;
		if (!updateCache) {
			cachedDeps = DependencyCache.findDependenciesByHash(depsHash);
			if (cachedDeps != null) {
				ModularClassPath mcp = new ModularClassPath(cachedDeps);
				verboseMsg(String.format("Resolved artifact(s) from cache: %s", mcp));
				return mcp;
			}
		}

		if (loggingEnabled) {
			infoMsg("Resolving dependencies...");
		}

		try (ArtifactResolver resolver = ArtifactResolver.Builder
																	.create()
																	.repositories(repos)
																	.withUserSettings(true)
																	.localFolder(getJBangLocalMavenRepoOverride())
																	.offline(offline)
																	.forceCacheUpdate(updateCache)
																	.logging(loggingEnabled)
																	.downloadSources(downloadSources)
																	.build()) {
			List artifacts = resolver.resolve(depIds);

			ModularClassPath mcp = new ModularClassPath(artifacts);

			if (loggingEnabled) {
				infoMsg("Dependencies resolved");
			}

			DependencyCache.cache(depsHash, mcp.getArtifacts());

			verboseMsg(String.format("Resolved artifact(s): %s", mcp));

			return mcp;
		} catch (DependencyException e) { // Probably a wrapped Nullpointer from
											// 'DefaultRepositorySystem.resolveDependencies()', this however is probably
											// a connection problem.
			errorMsg("Exception: " + e.getMessage());
			throw new ExitException(0,
					"Failed while connecting to the server. Check the connection (http/https, port, proxy, credentials, etc.) of your maven dependency locators.",
					e);
		}
	}

	public static String decodeEnv(String value) {
		if (value.startsWith("{{") && value.endsWith("}}")) {
			String envKey = value.substring(2, value.length() - 2);
			String envValue = System.getenv(envKey);
			if (null == envValue) {
				throw new IllegalStateException(String.format(
						"Could not resolve environment variable {{%s}} in maven repository credentials", envKey));
			}
			return envValue;
		} else {
			return value;
		}
	}

	public static boolean looksLikeAGav(String candidate) {
		Matcher gav = fullGavPattern.matcher(candidate);
		gav.find();
		return (gav.matches());
	}

	public static boolean looksLikeAPossibleGav(String candidate) {
		Matcher gav = lenientGavPattern.matcher(candidate);
		gav.find();
		return (gav.matches());
	}

	public static String formatVersion(String version) {
		// replace + with open version range for maven
		if (version != null && version.endsWith("+")) {
			return "[" + removeLastCharOptional(version) + ",)";
		} else {
			return version;
		}
	}

	public static String removeLastCharOptional(String s) {
		return Optional	.ofNullable(s)
						.filter(str -> str.length() != 0)
						.map(str -> str.substring(0, str.length() - 1))
						.orElse(s);
	}

	public static MavenRepo toMavenRepo(String repoReference) {
		String[] split = repoReference.split("=");
		String reporef = null;
		String repoid = null;

		if (split.length == 1) {
			reporef = split[0];
			repoid = reporef.toLowerCase();
		} else if (split.length == 2) {
			repoid = split[0];
			reporef = split[1];
		} else {
			throw new IllegalStateException("Invalid Maven repository reference: " + repoReference);
		}

		String repo = aliasToRepos.get(reporef.toLowerCase());
		if (repo != null) {
			return new MavenRepo(repoid, repo);
		} else {
			return new MavenRepo(repoid, reporef);
		}
	}
}