import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;

import com.sea.common.util.Resource;
import com.sea.common.util.StringUtil;

import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.Version;

/**
 * 较通用的FreeMarkers工具类
 * 
 * @author ChenSS 2017年10月19日
 * @since FreeMarker Version2.3.26
 */
public class FreeMarkers {
    private static Configuration sCfg;
    private static final Version VERSION = new Version("2.3.23");
    private static final String FILE_ROOT = "tmp/";

    public static Configuration defaultConfiguration() {
        if (sCfg == null) {
            synchronized (FreeMarkers.class) {
                if (sCfg == null) {
                    try {
                        sCfg = new Configuration(VERSION);
                        File file = new File(Resource.getResourcePath(FILE_ROOT));
                        sCfg.setNumberFormat("0.####");
                        sCfg.setDateFormat("yyyy-MM-dd");
                        sCfg.setTimeFormat("HH:mm:ss");
                        sCfg.setDateTimeFormat("yyyy-MM-dd HH:mm:ss");
                        sCfg.setBooleanFormat("true,false");
                        sCfg.setWhitespaceStripping(true);
                        sCfg.setClassicCompatible(true);
                        if (file.exists() && file.isDirectory())
                            sCfg.setDirectoryForTemplateLoading(file);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
        return sCfg;
    }

    public static void printFile(String tmp, Map<String, Object> params) throws Exception {
        Template template = sCfg.getTemplate(tmp);
        Writer out = new OutputStreamWriter(System.out);
        template.process(params, out);
        out.flush();
    }

    public static void printFile(String tmp, Object bean) throws Exception {
        Template template = sCfg.getTemplate(tmp);
        Writer out = new OutputStreamWriter(System.out);
        Map<String, Object> params = new HashMap<>();
        params.put(StringUtil.toCamelCase(bean.getClass().getSimpleName()), bean);
        template.process(params, out);
        out.flush();
    }

    public static void printStr(String tmp, Map<String, Object> params) throws Exception {
        Template template = new Template("name", new StringReader(tmp), sCfg);
        Writer out = new OutputStreamWriter(System.out);
        template.process(params, out);
        out.flush();
    }

    public static void printStr(String tmp, Object bean) throws Exception {
        Template template = new Template("name", new StringReader(tmp), sCfg);
        Writer out = new OutputStreamWriter(System.out);
        Map<String, Object> params = new HashMap<>();
        params.put(StringUtil.toCamelCase(bean.getClass().getSimpleName()), bean);
        template.process(params, out);
        out.flush();
    }

    public static String strToStr(String tmp, Map<String, Object> params) throws Exception {
        StringWriter result = new StringWriter();
        Template t = new Template("name", new StringReader(tmp), sCfg);
        t.process(params, result);
        return result.toString();
    }

    public static String strToStr(String tmp, Object bean) throws Exception {
        StringWriter result = new StringWriter();
        Template t = new Template("name", new StringReader(tmp), sCfg);
        Map<String, Object> params = new HashMap<>();
        params.put(StringUtil.toCamelCase(bean.getClass().getSimpleName()), bean);
        t.process(params, result);
        return result.toString();
    }

    public static String fileToStr(String tmp, Map<String, Object> params) throws Exception {
        Template template = sCfg.getTemplate(tmp);
        StringWriter writer = new StringWriter();
        template.process(params, writer);
        return writer.toString();
    }

    public static String fileToStr(String tmp, Object bean) throws Exception {
        Template template = sCfg.getTemplate(tmp);
        StringWriter writer = new StringWriter();
        Map<String, Object> params = new HashMap<>();
        params.put(StringUtil.toCamelCase(bean.getClass().getSimpleName()), bean);
        template.process(params, writer);
        return writer.toString();
    }

    public static void fileToFile(String tmp, String out, Map<String, Object> params) throws Exception {
        Template template = sCfg.getTemplate(tmp);
        FileWriter writer = new FileWriter(new File(out));
        template.process(params, writer);
    }

    public static void fileToFile(String tmp, String out, Object bean) throws Exception {
        Template template = sCfg.getTemplate(tmp);
        FileWriter writer = new FileWriter(new File(out));
        Map<String, Object> params = new HashMap<>();
        params.put(StringUtil.toCamelCase(bean.getClass().getSimpleName()), bean);
        template.process(params, writer);
    }

    public static void fileToFile(String tmp, File out, Map<String, Object> params) throws Exception {
        Template template = sCfg.getTemplate(tmp);
        FileWriter writer = new FileWriter(out);
        template.process(params, writer);
    }
    
    public static void fileToFile(String tmp, File out,Object bean) throws Exception {
        Template template = sCfg.getTemplate(tmp);
        FileWriter writer = new FileWriter(out);
        Map<String, Object> params = new HashMap<>();
        params.put(StringUtil.toCamelCase(bean.getClass().getSimpleName()), bean);
        template.process(params, writer);
    }

    public static void readerToWrite(InputStreamReader reader, Writer out, String tmpName, Map<String, Object> params)
            throws Exception {
        new Template(tmpName, reader, sCfg).process(params, out);
    }
}