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/*
 * Copyright 2014 the original author or authors.
 *
 * 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 ratpack.path.internal;

import com.google.common.collect.ImmutableList;
import ratpack.path.PathBinder;
import ratpack.path.PathBinderBuilder;

import java.util.regex.Pattern;

public class DefaultPathBinderBuilder implements PathBinderBuilder {
  private ImmutableList.Builder tokensBuilder = ImmutableList.builder();
  private StringBuilder pattern = new StringBuilder();
  private boolean addedOptional;
  private boolean addedToken;

  public PathBinderBuilder tokenWithPattern(String token, String pattern) {
    if (addedOptional) {
      throw new IllegalArgumentException(String.format("Cannot add mandatory parameter %s after optional parameters", token));
    }
    addedToken = true;
    tokensBuilder.add(token);
    this.pattern.append(String.format("(?:(?:^|/)(%s))", pattern));
    return this;
  }

  public PathBinderBuilder optionalTokenWithPattern(String token, String pattern) {
    addedOptional = true;
    addedToken = true;
    tokensBuilder.add(token);
    this.pattern.append(String.format("(?:(?:^|/)(%s))?", pattern));
    return this;
  }

  public PathBinderBuilder token(String token) {
    if (addedOptional) {
      throw new IllegalArgumentException(String.format("Cannot add mandatory parameter %s after optional parameters", token));
    }
    addedToken = true;
    tokensBuilder.add(token);
    pattern.append("(?:(?:^|/)([^/?&#]+))");
    return this;
  }

  public PathBinderBuilder optionalToken(String token) {
    addedOptional = true;
    addedToken = true;
    tokensBuilder.add(token);
    pattern.append("(?:(?:^|/)([^/?&#]*))?");
    return this;
  }

  public PathBinderBuilder literalPattern(String pattern) {
    this.pattern.append("(?:(?:^|/)").append(String.format("(?:%s)", pattern)).append(")");
    return this;
  }

  public PathBinderBuilder literal(String literal) {
    this.pattern.append(String.format("\\Q%s\\E", literal));
    return this;
  }

  public PathBinder build(boolean exact) {
    String regex = (addedToken ? "(\\Q\\E" : "(") + pattern + (addedToken ? "\\Q\\E)" : ")") + (exact ? "(?:/|$)" : "(?:/.*)?");
    Pattern compiled = Pattern.compile(regex);
    return new TokenPathBinder(tokensBuilder.build(), compiled);
  }
}