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/**
 * Copyright 2012 Lyncode
 *
 * 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.lyncode.jtwig.mvc;

import com.lyncode.jtwig.functions.JtwigFunction;
import com.lyncode.jtwig.functions.builders.FunctionRepositoryBuilder;
import com.lyncode.jtwig.functions.repository.AbstractFunctionRepository;
import com.lyncode.jtwig.functions.repository.WebFunctionRepository;
import com.lyncode.jtwig.services.api.theme.ThemePrefixResolver;
import org.reflections.Reflections;
import org.springframework.web.servlet.view.AbstractTemplateViewResolver;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import static org.apache.commons.lang3.StringUtils.isNotBlank;

public class JtwigViewResolver extends AbstractTemplateViewResolver {
    private static ThemePrefixResolver defaultPrefixResolver() {
        return new ThemePrefixResolver() {
            @Override
            public String getPrefix(String prefix, String theme) {
                return new File(prefix, theme).getPath();
            }
        };
    }

    private String encoding;
    private String theme;
    private boolean cached;
    private ThemePrefixResolver prefixResolver;
    private AbstractFunctionRepository functionRepository = new WebFunctionRepository();
    private List loadedFunctions = new ArrayList<>();

    public JtwigViewResolver() {
        this.prefixResolver = defaultPrefixResolver();
        setViewClass(requiredViewClass());
        setContentType("text/html; charset=UTF-8");
    }

    @Override
    protected Class requiredViewClass() {
        return JtwigView.class;
    }

    @Override
    protected String getPrefix() {
        if (hasTheme())
            return getPrefixWithTheme();
        else
            return super.getPrefix();
    }

    private String getPrefixWithTheme() {
        String prefix = prefixResolver.getPrefix(super.getPrefix(), getTheme());
        if (super.getPrefix().endsWith(File.separator))
            prefix += File.separator;
        return prefix;
    }

    public boolean isCached() {
        return cached;
    }

    public String getTheme() {
        return this.theme;
    }

    public boolean hasTheme() {
        return isNotBlank(theme);
    }

    public void setCached(boolean cached) {
        this.cached = cached;
    }

    public void setTheme(String theme) {
        this.theme = theme;
    }

    public String getEncoding() {
        return encoding;
    }

    public void setEncoding(String encoding) {
        this.encoding = encoding;
    }

    public void setFunctionRepository(AbstractFunctionRepository abstractFunctionRepository) {
        this.functionRepository = abstractFunctionRepository;
    }
    public void setFunctionRepository(FunctionRepositoryBuilder functionRepository) {
        this.functionRepository = functionRepository.build();
    }

    public AbstractFunctionRepository getFunctionRepository() {
        return functionRepository;
    }

    public void addFunctions (Class... functionClasses) {
        for (Class functionClass : functionClasses) {
            try {
                if (!loadedFunctions.contains(functionClass.getName())) {
                    functionRepository.add(functionClass.newInstance());
                    loadedFunctions.add(functionClass.getName());
                }
            } catch (InstantiationException e) {
                throw new RuntimeException("Unable to create instance of jtwig function "+functionClass.getName());
            } catch (IllegalAccessException e) {
                throw new RuntimeException("Unable to create instance of jtwig function "+functionClass.getName());
            }
        }
    }

    public void addFunctionPackages (String... packages) {
        for (String pack : packages) {
            Reflections reflections = new Reflections(pack);
            Set> functions = reflections.getSubTypesOf(JtwigFunction.class);
            addFunctions(functions.toArray(new Class[functions.size()]));;
        }
    }
}