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package com.clickntap.api;

import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.json.JSONObject;
import org.springframework.web.servlet.ModelAndView;

import com.clickntap.utils.ConstUtils;
import com.google.javascript.jscomp.CompilationLevel;
import com.google.javascript.jscomp.Compiler;
import com.google.javascript.jscomp.CompilerOptions;
import com.google.javascript.jscomp.SourceFile;

import freemarker.template.utility.StringUtil;

public class ApiUtils {

  public static final String JSON_CONTENT_TYPE_UTF_8 = "application/json; charset=UTF-8";
  public static final String JAVASCRIPT_CONTENT_TYPE_UTF_8 = "application/javascript; charset=UTF-8";
  public static final String CSS_CONTENT_TYPE_UTF_8 = "text/css; charset=UTF-8";
  public static final String TEXT_CONTENT_TYPE_UTF_8 = "text/plain; charset=UTF-8";

  public static String createCode(int size) {
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < size; i++) {
      char d;
      do {
        d = (char) ('A' + (Math.random() * ((int) 'Z' - (int) 'A')));
      } while (d == 'O' || d == 'I' || d == 'L');
      int n = (int) (Math.random() * (8)) + 2;
      sb.append(d).append(n);
    }
    return sb.toString();
  }

  public static List path(HttpServletRequest request, String folder) {
    String uri = request.getRequestURI();
    return path(uri, folder);
  }

  public static List path(String uri, String folder) {
    String folderPath = new StringBuffer().append('/').append(folder).append('/').toString();
    if (uri.indexOf(folderPath) > 0) {
      uri = uri.substring(uri.indexOf(folderPath));
    }
    if (uri.indexOf(folderPath) == 0) {
      return Arrays.asList(StringUtil.split(uri.substring(folderPath.length()), '/'));
    }
    return null;
  }

  public static List path(HttpServletRequest request) {
    return path(request, "api");
  }

  public static ModelAndView out(HttpServletRequest request, HttpServletResponse response, JSONObject json) throws Exception {
    String callback = request.getParameter("callback");
    if (callback == null) {
      return out(response, json.toString(), JSON_CONTENT_TYPE_UTF_8);
    } else {
      return out(response, new StringBuffer(callback).append('(').append(json.toString()).append(')').toString(), JAVASCRIPT_CONTENT_TYPE_UTF_8);
    }
  }

  public static ModelAndView out(HttpServletResponse response, String code, String contentType) throws Exception {
    response.setContentType(contentType);
    response.getOutputStream().write(code.getBytes(ConstUtils.UTF_8));
    return null;
  }

  public static String jsCompile(String js) {
    Compiler compiler = new Compiler();
    CompilerOptions options = new CompilerOptions();
    options.setEmitUseStrict(false);
    CompilationLevel.WHITESPACE_ONLY.setOptionsForCompilationLevel(options);
    SourceFile source = SourceFile.fromCode("js", js);
    compiler.compile(Collections.emptyList(), Collections.singletonList(source), options);
    String code = compiler.toSource();
    return code;

  }

  public static String codeFormat(String f) {
    return codeFormat(f, '{', '}');
  }

  public static String codeFormat(String f, char bracketOn, char bracketOff) {
    StringBuffer code = new StringBuffer();
    String[] lines = StringUtil.split(f, '\n');
    int indent = 0;
    for (String line : lines) {
      line = line.trim();
      if (line.isEmpty()) {
        continue;
      }
      StringBuffer formattedLine = new StringBuffer();
      int c1 = 0;
      int c2 = 0;
      int i1 = 0;
      int i2 = 0;
      for (int i = 0; i < line.length(); i++) {
        if (line.charAt(i) == bracketOn) {
          i1 = i;
          c1++;
        }
        if (line.charAt(i) == bracketOff) {
          i2 = i;
          c2++;
        }
      }
      if (c2 > c1) {
        indent += (2 * (c1 - c2));
      }
      if (c2 == c1 && c1 == 1 && i1 > i2) {
        indent -= 2;
      }
      for (int i = 0; i < indent; i++) {
        formattedLine.append(' ');
      }
      if (c2 == c1 && c1 == 1 && i1 > i2) {
        indent += 2;
      }
      formattedLine.append(line).append('\n');
      if (c1 > c2) {
        indent += (2 * (c1 - c2));
      }
      if (formattedLine.charAt(0) == bracketOff) {
        formattedLine.append('\n');
      }
      code.append(formattedLine);
    }
    return code.toString();
  }

  public static String toCamelCase(String value, boolean startWithLowerCase) {
    String[] strings = StringUtil.split(value.toLowerCase(), '_');
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < strings.length; i++) {
      if ((i == 0 && !startWithLowerCase) || i > 0) {
        sb.append(StringUtil.capitalize(strings[i]));
      } else {
        sb.append(strings[i]);
      }
    }
    return sb.toString();
  }

  public static String toCamelCase(String value) {
    return toCamelCase(value, true);
  }

  public static String lastModified(Date date) {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss z");
    simpleDateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
    String lastModified = simpleDateFormat.format(date);
    return lastModified;
  }

  public static void main(String args[]) {
    String js = "var variable = 0;\nfunction hello(a,b) {}; hello();";
    System.out.println(ApiUtils.jsCompile(js));
  }

}