package jetbrains.buildServer.buildTriggers.vcs.mercurial;

import jetbrains.buildServer.parameters.NullValueResolver;
import jetbrains.buildServer.parameters.ProcessingResult;
import jetbrains.buildServer.parameters.ReferencesResolverUtil;
import org.jetbrains.annotations.NotNull;

import java.io.IOException;

/**
* @author dmitry.neverov
*/
class HgPathResolver extends NullValueResolver {
  @NotNull
  public ProcessingResult resolve(@NotNull String value) {
    if (ReferencesResolverUtil.containsReference(value)) {
      if (value.equals(AgentSideCheckoutTest.HG_PATH_REFERENCE)) {
        try {
          return new ResolvedPath(Util.getHgPath());
        } catch (IOException e) {
          return new Unresolved(value);
        }
      } else {
        throw new IllegalArgumentException("Value resolver is asked to resolve " + value);
      }
    } else {
      return new ResolvedPath(value);
    }
  }

  private static class ResolvedPath implements ProcessingResult {
    private final String myPath;
    ResolvedPath(final @NotNull String path) {
      myPath = path;
    }
    public boolean isModified() {
      return true;
    }
    @NotNull
    public String getResult() {
      return myPath;
    }
    public boolean isFullyResolved() {
      return true;
    }
  }

  private static class Unresolved implements ProcessingResult {
    private final String myUnresolvedValue;
    Unresolved(@NotNull final String value) {
      myUnresolvedValue = value;
    }
    public boolean isModified() {
      return false;
    }
    @NotNull
    public String getResult() {
      return myUnresolvedValue;
    }
    public boolean isFullyResolved() {
      return false;
    }
  }
}