package com.framsticks.params;

import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;

import com.framsticks.params.annotations.AutoAppendAnnotation;
import com.framsticks.params.annotations.FramsClassAnnotation;
import com.framsticks.params.annotations.ParamAnnotation;
import com.framsticks.parsers.FileSource;
import com.framsticks.parsers.Loaders;
import com.framsticks.util.Builder;
import com.framsticks.util.Misc;
import com.framsticks.util.lang.Containers;
import com.framsticks.util.lang.Strings;

@FramsClassAnnotation(id = "class", name = "class")
public class FramsClassBuilder implements Builder<FramsClass> {
	private static final Logger log =
		LogManager.getLogger(FramsClassBuilder.class);

	public static String getName(FramsClassAnnotation fca, Class<?> javaClass) {
		return fca.name().equals("") ? javaClass.getSimpleName() : fca.name();
	}

	public static String getId(FramsClassAnnotation fca, Class<?> javaClass) {
		return fca.id().equals("") ? javaClass.getSimpleName() : fca.id();
	}


	public static final String GENERATE_HELP_PREFIX = "automatically generated from: ";

	public static FramsClass readFromStream(InputStream stream) {
		return readFromSource(new FileSource(stream));
	}

	public static FramsClass readFromSource(Source source) {
		return Loaders.loadFramsClass(source);
	}

	// public static Class<? extends Param> getParamType(@Nonnull Class<?> c) {
	//	if (c.equals(Integer.class)) {
	//		return DecimalParam.class;
	//	}
	//	if (c.equals(Double.class)) {
	//		return FloatParam.class;
	//	}
	//	if (c.equals(String.class)) {
	//		return StringParam.class;
	//	}
	//	if (c.equals(Object.class)) {
	//		return UniversalParam.class;
	//	}
	//	return null;
	// }

	public static String extractIdOf(Member member) {
		if (member instanceof Field) {
			return member.getName();
		}
		if (member instanceof Method) {
			Method m = (Method) member;
			String n = m.getName();
			int argsNum = m.getParameterTypes().length;
			if (argsNum == 0) {
				return n.startsWith("get") ? Strings.uncapitalize(n.substring(3)) : n;
			}
			if (argsNum == 1) {
				if (n.startsWith("set")) {
					return Strings.uncapitalize(n.substring(3));
				}
				if (n.startsWith("add")) {
					return Strings.uncapitalize(n.substring(3));
				}
				if (n.startsWith("remove")) {
					return Strings.uncapitalize(n.substring(6));
				}
				return n;
			}
			log.error("invalid number of arguments");
			return null;
		}
		log.error("invalid kind of member");
		return null;
	}
	public static String getName(ParamAnnotation annotation, Member member) {
		return annotation.name().equals("") ? Strings.capitalize(extractIdOf(member)) : annotation.name();
	}

	public static String getId(ParamAnnotation annotation, Member member) {
		return annotation.id().equals("") ? extractIdOf(member) : annotation.id();
	}

	public static ParamBuilder fill(ParamBuilder builder, Member member, ParamAnnotation annotation) {
		return builder
			.id(getId(annotation, member))
			.name(getName(annotation, member));

	}

	public static final Map<Class<?>, FramsClass> synchronizedCacheForBasedOnForJavaClass = Collections.synchronizedMap(new IdentityHashMap<Class<?>, FramsClass>());

	public FramsClass forClass(Class<?> javaClass) throws ConstructionException {
		FramsClass result = synchronizedCacheForBasedOnForJavaClass.get(javaClass);
		if (result != null) {
			return result;
		}

		log.debug("building for class {}", javaClass);

		FramsClassAnnotation fca = javaClass.getAnnotation(FramsClassAnnotation.class);
		if (fca == null) {
			throw new ConstructionException().msg("java class is not annotated with FramsClassAnnotation").arg("java", javaClass);
		}

		id(getId(fca, javaClass));
		name(getName(fca, javaClass));

		for (ParamCandidate pc : ParamCandidate.getAllCandidates(javaClass).getOrder()) {
			ParamBuilder builder = Param.build().id(pc.getId()).name(pc.getName()).flags(pc.getFlags());

			pc.induceParamType(builder);

			for (ParamAnnotation pa : pc.getAnnotations()) {
				if (!"".equals(pa.def())) {
					builder.def(pa.def());
				}
				if (!"".equals(pa.help())) {
					builder.help(pa.help());
				}
				if (!"".equals(pa.min())) {
					builder.min(pa.min());
				}
				if (!"".equals(pa.max())) {
					builder.max(pa.max());
				}
				builder.extra(pa.extra());
				if (!"".equals(pa.stringType())) {
					builder.type(pa.stringType());
				}
				if (!pa.paramType().equals(Param.class)) {
					builder.type(pa.paramType());
				}
			}
			param(builder);
		}

		result = finish();

		synchronizedCacheForBasedOnForJavaClass.put(javaClass, result);

		return result;
	}


	protected String id;

	protected String name;

	protected String description;

	protected final List<Param> params = new LinkedList<>();

	protected List<GroupBuilder> groupBuilders = new ArrayList<GroupBuilder>();

	@ParamAnnotation
	public FramsClassBuilder id(String id) {
		this.id = id;
		return this;
	}

	@ParamAnnotation
	public FramsClassBuilder name(String name) {
		this.name = name;
		return this;
	}

	public FramsClassBuilder idAndName(String v) {
		this.id = v;
		this.name = v;
		return this;
	}

	@ParamAnnotation(id = "desc")
	public FramsClassBuilder description(String description) {
		this.description = description;
		return this;
	}

	public FramsClassBuilder() {
	}

	public FramsClass finish() {
		return new FramsClass(this);
	}

	@AutoAppendAnnotation
	public FramsClassBuilder param(ParamBuilder builder) {
		Param param = builder.finish();

		Integer group = param.getGroup();
		if (group != null) {
			Containers.getFromList(groupBuilders, group, "group", this).addParam(param);
		}

		params.add(param);
		return this;
	}

	@AutoAppendAnnotation
	public FramsClassBuilder group(GroupBuilder builder) {
		groupBuilders.add(builder);
		return this;
	}

	/**
	 * @return the id
	 */
	@ParamAnnotation
	public String getId() {
		return id;
	}

	/**
	 * @return the name
	 */
	@ParamAnnotation
	public String getName() {
		return name;
	}

	/**
	 * @return the description
	 */
	@ParamAnnotation(id = "desc")
	public String getDescription() {
		return description;
	}

	public FramsClassBuilder group(String group) {
		return group(new GroupBuilder().name(group));
	}

	@Override
	public String toString() {
		return "FramsClassBuilder for " + Misc.returnNotNull(id, "<not yet known>");
	}



}