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/*
 * Jooby https://jooby.io
 * Apache License Version 2.0 https://jooby.io/LICENSE.txt
 * Copyright 2014 Edgar Espina
 */
package io.jooby.internal.apt;

import static io.jooby.internal.apt.AnnotationSupport.NON_NULL;
import static io.jooby.internal.apt.AnnotationSupport.NULLABLE;

import java.util.*;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.element.VariableElement;

public class MvcParameter {
  private final MvcRoute route;
  private final VariableElement parameter;
  private final Map annotations;
  private final TypeDefinition type;

  public MvcParameter(MvcContext context, MvcRoute route, VariableElement parameter) {
    this.route = route;
    this.parameter = parameter;
    this.annotations = annotationMap(parameter);
    this.type =
        new TypeDefinition(context.getProcessingEnvironment().getTypeUtils(), parameter.asType());
  }

  public TypeDefinition getType() {
    return type;
  }

  public String generateMapping(boolean kt) {
    var strategy =
        annotations.entrySet().stream()
            .flatMap(
                it -> {
                  var found = ParameterGenerator.findByAnnotation(it.getKey());
                  return found == null
                      ? Stream.empty()
                      : Stream.of(Map.entry(found, it.getValue()));
                })
            .findFirst();
    var defaultParameterName = parameter.getSimpleName().toString();
    var parameterName =
        strategy
            .map(it -> it.getKey().parameterName(it.getValue(), defaultParameterName))
            .orElse(defaultParameterName);
    var rawType = type.getRawType();
    var elementType =
        type.getArguments().isEmpty() ? rawType : type.getArguments().get(0).getRawType();
    // keep kotlin.coroutines.Continuation as main type
    var parameterType = elementType.toString();
    return switch (parameterType) {
        /* Type Injection: */
      case "io.jooby.Context" -> CodeBlock.of("ctx");
      case "io.jooby.QueryString" -> {
        if (type.is(Optional.class)) {
          yield CodeBlock.of("java.util.Optional.ofNullable(ctx.query())");
        } else {
          yield CodeBlock.of("ctx.query()");
        }
      }
      case "io.jooby.Formdata" -> CodeBlock.of("ctx.form()");
      case "io.jooby.FlashMap" -> CodeBlock.of("ctx.flash()");
      case "io.jooby.Body" -> CodeBlock.of("ctx.body()");
      case "io.jooby.Session" -> {
        if (type.is(Optional.class)) {
          yield CodeBlock.of("java.util.Optional.ofNullable(ctx.sessionOrNull())");
        } else {
          yield hasAnnotation(NULLABLE)
              ? CodeBlock.of("ctx.sessionOrNull()")
              : CodeBlock.of("ctx.session()");
        }
      }
      case "io.jooby.Route" -> CodeBlock.of("ctx.getRoute()");
        // FileUpload
      case "io.jooby.FileUpload" ->
          switch (rawType.toString()) {
            case "java.util.List" ->
                CodeBlock.of("ctx.files(", CodeBlock.string(parameterName), ")");
            case "java.util.Optional" ->
                CodeBlock.of(
                    "ctx.files(", CodeBlock.string(parameterName), ").stream().findFirst()");
            default -> CodeBlock.of("ctx.file(", CodeBlock.string(parameterName), ")");
          };
      case "java.nio.file.Path" ->
          CodeBlock.of("ctx.file(", CodeBlock.string(parameterName), ").path()");
      default -> {
        // By annotation type;
        if (strategy.isEmpty()) {
          // must be body
          yield ParameterGenerator.BodyParam.toSourceCode(
              kt, route, null, type, parameterName, isNullable(kt));
        } else {
          yield strategy
              .get()
              .getKey()
              .toSourceCode(
                  kt, route, strategy.get().getValue(), type, parameterName, isNullable(kt));
        }
      }
    };
  }

  public boolean isNullable(boolean kt) {
    // Any that ends with `Nullable`
    if (hasAnnotation(NULLABLE)) {
      return true;
    }
    if (hasAnnotation(NON_NULL)) {
      return false;
    }
    if (kt) {
      // TODO: review Optional arguments
      return false;
    }
    return !parameter.asType().getKind().isPrimitive();
  }

  private boolean hasAnnotation(Predicate predicate) {
    return annotations.keySet().stream().anyMatch(predicate);
  }

  private Map annotationMap(VariableElement parameter) {
    return Stream.of(parameter.getAnnotationMirrors(), parameter.asType().getAnnotationMirrors())
        .filter(Objects::nonNull)
        .flatMap(List::stream)
        .flatMap(
            it ->
                Stream.concat(
                    Stream.of(it),
                    annotationFromAnnotationType(it.getAnnotationType().asElement()).stream()))
        .filter(Objects::nonNull)
        .map(it -> Map.entry(it.getAnnotationType().toString(), it))
        .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue, (e1, e2) -> e1));
  }

  private List annotationFromAnnotationType(Element element) {
    return Optional.ofNullable(element.getAnnotationMirrors()).orElse(Collections.emptyList());
  }
}