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package net.zerobuilder.compiler.generate;

import com.squareup.javapoet.CodeBlock;
import com.squareup.javapoet.TypeSpec;
import net.zerobuilder.compiler.generate.DtoParameter.AbstractParameter;
import net.zerobuilder.compiler.generate.DtoSimpleGoal.SimpleGoal;
import net.zerobuilder.compiler.generate.DtoStep.AbstractStep;

import java.util.function.Function;

import static net.zerobuilder.compiler.generate.DtoParameter.parameterName;
import static net.zerobuilder.compiler.generate.DtoStep.always;
import static net.zerobuilder.compiler.generate.DtoStep.asFunction;
import static net.zerobuilder.compiler.generate.DtoStep.stepCases;
import static net.zerobuilder.compiler.generate.StepB.beanStepInterface;
import static net.zerobuilder.compiler.generate.StepV.regularStepInterface;
import static net.zerobuilder.compiler.generate.ZeroUtil.emptyCodeBlock;
import static net.zerobuilder.compiler.generate.ZeroUtil.nullCheck;

public final class Step {

  public static final Function nullCheck
      = always(step -> {
    AbstractParameter parameter = step.abstractParameter();
    if (!parameter.nullPolicy.check() || parameter.type.isPrimitive()) {
      return emptyCodeBlock;
    }
    String name = parameterName.apply(parameter);
    return nullCheck(name, name);
  });

  public static Function asStepInterface(SimpleGoal goal) {
    return asFunction(stepCases(
        regularStepInterface(goal),
        beanStepInterface));
  }

  private Step() {
    throw new UnsupportedOperationException("no instances");
  }
}