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package org.beetl.core;

import java.io.IOException;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;

import org.beetl.core.config.BeetlConfig;
import org.beetl.core.exception.BeetlException;
import org.beetl.core.exception.ErrorInfo;
import org.beetl.core.util.Log;
import org.beetl.core.resource.StringTemplateResourceLoader;

/**
 * 一个综合展示Beetl功能代码
 * * @author
 */
public class BeetlKit {

    /** DEBUG flag */
    private static final boolean DEBUG = BeetlConfig.DEBUG;
    /** Log TAG */
    private static final String TAG = "BeetlKit";

    /**
     * BeetlKit 默认使用的GroupTemplate，用户可以设置新的
     */
    public static GroupTemplate gt = null;

    static {
        StringTemplateResourceLoader resourceLoader = new StringTemplateResourceLoader();
        Configuration cfg;
        try {
            cfg = Configuration.defaultConfiguration();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        gt = new GroupTemplate(resourceLoader, cfg);
        gt.setErrorHandler(new ReThrowConsoleErrorHandler());

    }

    private static Map emptyMap = new HashMap();

    /* 模板部分 */

    /**
     * 渲染模板
     *
     * @return 模板返回值
     */
    public static String render(String template, Map paras) {
        Template t = gt.getTemplate(template);
        t.binding(paras);
        return t.render();
    }

    /**
     * 渲染模板
     */
    public static void renderTo(String template, Writer writer, Map paras) {
        Template t = gt.getTemplate(template);
        t.binding(paras);
        t.renderTo(writer);
    }

    /* 脚本部分 */

    /**
     * @param paras 返回map，包含的"return" 是返回值，其他均为顶级变量
     */
    public static Map execute(String script, Map paras) throws BeetlException {
        return gt.runScript(script, emptyMap);
    }

    /**
     * 执行脚本，和参数，返回脚本里的Root scope的变量
     */
    public static Map execute(String script) throws BeetlException {
        return gt.runScript(script, new HashMap());

    }

    /**
     * @param template  模板内容
     * @param initValue 模板初始化值
     * @return 模板渲染结果
     */
    public static String testTemplate(String template, String initValue) throws BeetlException {
        return render(template, execute(initValue));
    }

    public static void main(String[] args) throws BeetlException {
        BeetlKit.gt.getConf().setStatementStart("@");
        BeetlKit.gt.getConf().setStatementEnd(null);
        String json = "var a=".concat("[1,2,c+1 ]").concat(";");
        try {
            BeetlKit.execute(json);
        } catch (BeetlException e) {
            if (DEBUG) {
                ErrorInfo info = new ErrorInfo(e);
                Log.e(TAG, "error=" + info.toString());
            }
        }
    }
}