/*
 * Copyright 2012 Google Inc.
 *
 * 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.google.template.soy.basicdirectives;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.template.soy.data.SoyValue;
import com.google.template.soy.jssrc.restricted.JsExpr;
import com.google.template.soy.jssrc.restricted.JsExprUtils;
import com.google.template.soy.jssrc.restricted.SoyJsSrcPrintDirective;
import com.google.template.soy.pysrc.restricted.PyExpr;
import com.google.template.soy.pysrc.restricted.SoyPySrcPrintDirective;
import com.google.template.soy.shared.restricted.SoyJavaPrintDirective;
import com.google.template.soy.shared.restricted.SoyPurePrintDirective;

import java.util.List;
import java.util.Set;

import javax.inject.Inject;
import javax.inject.Singleton;


/**
 * Internal-only directive indicating content is to be treated as plain text.
 *
 * Should never be used by users in its current state. This directive itself
 * performs no escaping, though in the future, it may force autoescaping to
 * re-escape the value.
 *
 */
@Singleton
@SoyPurePrintDirective
final class TextDirective
    implements SoyJavaPrintDirective, SoyJsSrcPrintDirective, SoyPySrcPrintDirective {


  @Inject
  public TextDirective() {}


  @Override public String getName() {
    return "|text";
  }

  @Override public Set<Integer> getValidArgsSizes() {
    return ImmutableSet.of(0);
  }

  @Override public boolean shouldCancelAutoescape() {
    // TODO: This simply indicates simply that the "blanket html-escape everything and its cousin"
    // should not run, but eventually, it'd be nice for this to end up forcing the result to be
    // re-escaped. For now, CheckEscapingSanityVisitor bans non-internal use of this.
    return true;
  }

  @Override public SoyValue applyForJava(SoyValue value, List<SoyValue> args) {
    // TODO: If this directive is opened up to users, this needs to coerce the value to a string.
    return value;
  }

  @Override public JsExpr applyForJsSrc(JsExpr value, List<JsExpr> args) {
    // Coerce to string, since sometimes this will be the root of an expression and will be used as
    // a return value or let-block assignment.
    return JsExprUtils.concatJsExprs(ImmutableList.of(new JsExpr("''", Integer.MAX_VALUE), value));
  }

  @Override public PyExpr applyForPySrc(PyExpr value, List<PyExpr> args) {
    return value.toPyString();
  }
}