package com.hypixel.hytale.server.npc.asset.builder;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.hypixel.hytale.codec.schema.SchemaContext;
import com.hypixel.hytale.codec.schema.config.ArraySchema;
import com.hypixel.hytale.codec.schema.config.BooleanSchema;
import com.hypixel.hytale.codec.schema.config.ObjectSchema;
import com.hypixel.hytale.codec.schema.config.Schema;
import com.hypixel.hytale.codec.schema.config.StringSchema;
import com.hypixel.hytale.server.npc.asset.builder.expression.BuilderExpression;
import com.hypixel.hytale.server.npc.asset.builder.expression.BuilderExpressionStaticBooleanArray;
import com.hypixel.hytale.server.npc.asset.builder.expression.BuilderExpressionStaticEmptyArray;
import com.hypixel.hytale.server.npc.asset.builder.expression.BuilderExpressionStaticNumberArray;
import com.hypixel.hytale.server.npc.asset.builder.expression.BuilderExpressionStaticStringArray;
import com.hypixel.hytale.server.npc.util.expression.ExecutionContext;
import com.hypixel.hytale.server.npc.util.expression.StdScope;
import com.hypixel.hytale.server.npc.util.expression.ValueType;
import com.hypixel.hytale.server.npc.util.expression.compile.CompileContext;
import it.unimi.dsi.fastutil.ints.IntOpenHashSet;
import it.unimi.dsi.fastutil.ints.IntSet;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class BuilderParameters {
   public static final String KEY_PARAMETERS = "Parameters";
   public static final String KEY_IMPORT_STATES = "_ImportStates";
   public static final String KEY_INTERFACE = "Interface";
   @Nonnull
   protected final Map<String, BuilderParameters.Parameter> parameters;
   protected StdScope scope;
   @Nullable
   protected CompileContext compileContext;
   protected final String fileName;
   protected final IntSet dependencies;
   protected final String interfaceCode;

   protected BuilderParameters(StdScope scope, String fileName, String interfaceCode) {
      this(scope, fileName, interfaceCode, new IntOpenHashSet());
   }

   protected BuilderParameters(StdScope scope, String fileName, String interfaceCode, IntSet dependencies) {
      this.scope = new StdScope(scope);
      this.compileContext = new CompileContext(this.scope);
      this.parameters = new HashMap<>();
      this.fileName = fileName;
      this.dependencies = dependencies;
      this.interfaceCode = interfaceCode;
   }

   protected BuilderParameters(@Nonnull BuilderParameters other) {
      this(other.scope, other.fileName, other.interfaceCode, other.dependencies);
   }

   public boolean isEmpty() {
      return this.parameters.isEmpty();
   }

   public void addParametersToScope() {
      this.parameters.forEach((name, parameter) -> parameter.expression.addToScope(name, this.scope));
   }

   public ValueType getParameterType(String name) {
      BuilderParameters.Parameter p = this.parameters.get(name);
      return p != null && !p.isPrivate() ? p.getExpression().getType() : ValueType.VOID;
   }

   public void readJSON(@Nonnull JsonObject jsonObject, @Nonnull StateMappingHelper stateHelper) {
      JsonElement parameterValue = jsonObject.get("Parameters");
      if (parameterValue != null) {
         JsonObject modify = BuilderBase.expectObject(parameterValue, "Parameters");
         modify.entrySet().forEach(stringElementPair -> {
            String key = (String)stringElementPair.getKey();
            if (this.parameters.containsKey(key)) {
               throw new IllegalStateException("Duplicate entry '" + key + "' in 'Parameters' block");
            } else if (key.equals("_ImportStates")) {
               if (!((JsonElement)stringElementPair.getValue()).isJsonArray()) {
                  throw new IllegalStateException(String.format("%s in parameter block must be a Json Array", "_ImportStates"));
               } else {
                  stateHelper.setComponentImportStateMappings(((JsonElement)stringElementPair.getValue()).getAsJsonArray());
               }
            } else {
               this.parameters.put(key, BuilderParameters.Parameter.fromJSON((JsonElement)stringElementPair.getValue(), this, key));
            }
         });
      }
   }

   public void createCompileContext() {
      this.compileContext = new CompileContext();
   }

   public void disposeCompileContext() {
      this.compileContext = null;
   }

   @Nullable
   public CompileContext getCompileContext() {
      return this.compileContext;
   }

   public ValueType compile(@Nonnull String expression) {
      return this.getCompileContext().compile(expression, this.getScope(), false);
   }

   public List<ExecutionContext.Instruction> getInstructions() {
      return this.getCompileContext().getInstructions();
   }

   @Nullable
   public ExecutionContext.Operand getConstantOperand() {
      return this.getCompileContext().getAsOperand();
   }

   public StdScope getScope() {
      return this.scope;
   }

   @Nonnull
   public StdScope createScope() {
      return StdScope.copyOf(this.scope);
   }

   public void validateNoDuplicateParameters(@Nonnull BuilderParameters other) {
      other.parameters.keySet().forEach(key -> {
         if (this.parameters.containsKey(key)) {
            throw new IllegalStateException("Parameter '" + key + "' in 'Parameters' block hides parameter from parent scope");
         }
      });
   }

   public String getFileName() {
      return this.fileName;
   }

   public IntSet getDependencies() {
      return this.dependencies;
   }

   public String getInterfaceCode() {
      return this.interfaceCode;
   }

   public void addDependency(int d) {
      this.dependencies.add(d);
   }

   @Nonnull
   public static ObjectSchema toSchema(@Nonnull SchemaContext context) {
      ObjectSchema schema = new ObjectSchema();
      schema.setTitle("Parameters");
      schema.setProperties(Map.of("_ImportStates", new ArraySchema(new StringSchema())));
      schema.setAdditionalProperties(BuilderParameters.Parameter.toSchema(context));
      return schema;
   }

   public static class Parameter {
      public static final String KEY_VALUE = "Value";
      public static final String KEY_TYPE_HINT = "TypeHint";
      public static final String KEY_VALIDATE = "Validate";
      public static final String KEY_CONFINE = "Confine";
      public static final String KEY_DESCRIPTION = "Description";
      public static final String KEY_PRIVATE = "Private";
      private final BuilderExpression expression;
      private final String description;
      private final String code;
      private List<ExecutionContext.Instruction> instructionList;
      private final boolean isValidation;
      private final boolean isPrivate;

      public Parameter(BuilderExpression expression, String description, String code, boolean isValidation, boolean isPrivate) {
         this.expression = expression;
         this.description = description;
         this.code = code;
         this.isValidation = isValidation;
         this.isPrivate = isPrivate;
      }

      public BuilderExpression getExpression() {
         return this.expression;
      }

      public String getDescription() {
         return this.description;
      }

      public boolean isValidation() {
         return this.isValidation;
      }

      public boolean isPrivate() {
         return this.isPrivate;
      }

      @Nonnull
      public static ObjectSchema toSchema(@Nonnull SchemaContext context) {
         ObjectSchema props = new ObjectSchema();
         props.setTitle("Parameter");
         LinkedHashMap<String, Schema> map = new LinkedHashMap<>();
         map.put("Value", BuilderExpression.toSchema(context));
         map.put("TypeHint", new StringSchema());
         map.put("Validate", new StringSchema());
         map.put("Confine", new StringSchema());
         map.put("Description", new StringSchema());
         map.put("Private", new BooleanSchema());
         props.setProperties(map);
         return props;
      }

      @Nonnull
      private static BuilderParameters.Parameter fromJSON(@Nonnull JsonElement element, @Nonnull BuilderParameters builderParameters, String parameterName) {
         JsonObject jsonObject = BuilderBase.expectObject(element);
         BuilderExpression expression = BuilderExpression.fromJSON(BuilderBase.expectKey(jsonObject, "Value"), builderParameters, true);
         if (expression instanceof BuilderExpressionStaticEmptyArray) {
            if (!jsonObject.has("TypeHint")) {
               throw new IllegalStateException("TypeHint missing for parameter " + parameterName);
            }

            String type = BuilderBase.readString(jsonObject, "TypeHint");
            if ("STRING".equalsIgnoreCase(type)) {
               expression = BuilderExpressionStaticStringArray.INSTANCE_EMPTY;
            } else if ("NUMBER".equalsIgnoreCase(type)) {
               expression = BuilderExpressionStaticNumberArray.INSTANCE_EMPTY;
            } else {
               if (!"BOOLEAN".equalsIgnoreCase(type)) {
                  throw new IllegalStateException("TypeHint must be one of STRING, NUMBER, BOOLEAN for parameter " + parameterName);
               }

               expression = BuilderExpressionStaticBooleanArray.INSTANCE_EMPTY;
            }
         }

         String validate = BuilderBase.readString(jsonObject, "Validate", null);
         String confine = BuilderBase.readString(jsonObject, "Confine", null);
         boolean hasValidate = validate != null;
         if (hasValidate && confine != null) {
            throw new IllegalStateException("Only either 'Confine' or 'Validate' allowed for parameter " + parameterName);
         } else {
            String code = hasValidate ? validate : confine;
            return new BuilderParameters.Parameter(
               expression, BuilderBase.readString(jsonObject, "Description", null), code, hasValidate, BuilderBase.readBoolean(jsonObject, "Private", false)
            );
         }
      }
   }
}