/*
 * Copyright 2018 OpenAPI-Generator Contributors (https://openapi-generator.tech)
 * Copyright 2018 SmartBear Software
 *
 * 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 org.openapitools.codegen.languages;

import org.apache.commons.lang3.StringUtils;
import org.openapitools.codegen.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.*;

import static org.openapitools.codegen.utils.StringUtils.camelize;
import static org.openapitools.codegen.utils.StringUtils.underscore;

public class ScalaLagomServerCodegen extends AbstractScalaCodegen implements CodegenConfig {
    private static final Logger LOGGER = LoggerFactory.getLogger(ScalaLagomServerCodegen.class);

    private String authScheme = "";
    private boolean authPreemptive = false;
    protected String groupId = "org.openapitools";
    protected String artifactId = "scala-lagom-server";
    protected String artifactVersion = "1.0.0";

    public ScalaLagomServerCodegen() {
        super();
        outputFolder = "generated-code/scala-lagom-server";
        modelTemplateFiles.put("model.mustache", ".scala");
        apiTemplateFiles.put("api.mustache", ".scala");
        embeddedTemplateDir = templateDir = "scala-lagom-server";
        apiPackage = "io.swagger.client.api";
        modelPackage = "io.swagger.client.model";

        setReservedWordsLowerCase(
                Arrays.asList(
                        // local variable names used in API methods (endpoints)
                        "path", "contentTypes", "contentType", "queryParams", "headerParams",
                        "formParams", "postBody", "mp", "basePath", "apiInvoker",

                        // scala reserved words
                        "abstract", "case", "catch", "class", "def", "do", "else", "extends",
                        "false", "final", "finally", "for", "forSome", "if", "implicit",
                        "import", "lazy", "match", "new", "null", "object", "override", "package",
                        "private", "protected", "return", "sealed", "super", "this", "throw",
                        "trait", "try", "true", "type", "val", "var", "while", "with", "yield")
        );

        additionalProperties.put(CodegenConstants.GROUP_ID, groupId);
        additionalProperties.put(CodegenConstants.ARTIFACT_ID, artifactId);
        additionalProperties.put(CodegenConstants.ARTIFACT_VERSION, artifactVersion);
        additionalProperties.put("authScheme", authScheme);
        additionalProperties.put("authPreemptive", authPreemptive);

        supportingFiles.add(new SupportingFile("README.mustache", "", "README.md"));
        supportingFiles.add(new SupportingFile("gitignore.mustache", "", ".gitignore"));
        supportingFiles.add(new SupportingFile("build.sbt.mustache", "", "build.sbt"));
        supportingFiles.add(new SupportingFile("build.properties.mustache", "", "project/build.properties"));
        supportingFiles.add(new SupportingFile("plugins.sbt.mustache", "", "project/plugins.sbt"));

        importMapping.remove("List");
        importMapping.remove("Set");
        importMapping.remove("Map");

        importMapping.put("DateTime", "org.joda.time.DateTime");
        importMapping.put("ListBuffer", "scala.collection.mutable.ListBuffer");

        typeMapping = new HashMap<String, String>();
        typeMapping.put("Integer", "Int");
        typeMapping.put("enum", "NSString");
        typeMapping.put("array", "Seq");
        typeMapping.put("set", "Set");
        typeMapping.put("boolean", "Boolean");
        typeMapping.put("string", "String");
        typeMapping.put("int", "Int");
        typeMapping.put("long", "Long");
        typeMapping.put("float", "Float");
        typeMapping.put("byte", "Byte");
        typeMapping.put("short", "Short");
        typeMapping.put("char", "Char");
        typeMapping.put("long", "Long");
        typeMapping.put("double", "Double");
        typeMapping.put("object", "Any");
        typeMapping.put("file", "File");

        //TODO binary should be mapped to byte array
        // mapped to String as a workaround
        typeMapping.put("binary", "String");
        typeMapping.put("ByteArray", "String");

        instantiationTypes.put("array", "ListBuffer");
        instantiationTypes.put("map", "HashMap");

        cliOptions.add(new CliOption(CodegenConstants.MODEL_PROPERTY_NAMING,
                CodegenConstants.MODEL_PROPERTY_NAMING_DESC).defaultValue("camelCase"));
    }

    @Override
    public void processOpts() {
        super.processOpts();

        if (additionalProperties.containsKey(CodegenConstants.MODEL_PROPERTY_NAMING)) {
            setModelPropertyNaming(
                    (String) additionalProperties.get(CodegenConstants.MODEL_PROPERTY_NAMING));
        }
    }

    public void setModelPropertyNaming(String naming) {
        if ("original".equals(naming) || "camelCase".equals(naming) ||
                "PascalCase".equals(naming) || "snake_case".equals(naming)) {
            this.modelPropertyNaming = naming;
        } else {
            throw new IllegalArgumentException("Invalid model property naming '" +
                    naming + "'. Must be 'original', 'camelCase', " +
                    "'PascalCase' or 'snake_case'");
        }
    }

    public String getModelPropertyNaming() {
        return this.modelPropertyNaming;
    }

    @Override
    public String toVarName(String name) {
        // sanitize name
        name = sanitizeName(
                name); // FIXME: a parameter should not be assigned. Also declare the methods parameters as 'final'.

        if ("_".equals(name)) {
            name = "_u";
        }

        // if it's all uppper case, do nothing
        if (name.matches("^[A-Z_]*$")) {
            return name;
        }

        name = getNameUsingModelPropertyNaming(name);

        // for reserved word or word starting with number, append _
        if (isReservedWord(name) || name.matches("^\\d.*")) {
            name = escapeReservedWord(name);
        }

        return name;
    }

    @Override
    public String toParamName(String name) {
        // should be the same as variable name
        return toVarName(name);
    }

    private String getNameUsingModelPropertyNaming(String name) {
        switch (CodegenConstants.MODEL_PROPERTY_NAMING_TYPE.valueOf(getModelPropertyNaming())) {
            case original:
                return name;
            case camelCase:
                return camelize(name, true);
            case PascalCase:
                return camelize(name);
            case snake_case:
                return underscore(name);
            default:
                throw new IllegalArgumentException("Invalid model property naming '" +
                        name + "'. Must be 'original', 'camelCase', " +
                        "'PascalCase' or 'snake_case'");
        }

    }

    @Override
    public CodegenType getTag() {
        return CodegenType.SERVER;
    }

    @Override
    public String getName() {
        return "scala-lagom-server";
    }

    @Override
    public String getHelp() {
        return "Generates a Lagom API server (Beta) in scala";
    }

    @Override
    public String toOperationId(String operationId) {
        // throw exception if method name is empty
        if (StringUtils.isEmpty(operationId)) {
            throw new RuntimeException("Empty method name (operationId) not allowed");
        }

        // method name cannot use reserved keyword, e.g. return
        if (isReservedWord(operationId)) {
            throw new RuntimeException(operationId + " (reserved word) cannot be used as method name");
        }

        return camelize(operationId, true);
    }

    @Override
    public String toModelName(final String name) {
        final String sanitizedName = sanitizeName(modelNamePrefix + name + modelNameSuffix);

        // camelize the model name
        // phone_number => PhoneNumber
        final String camelizedName = camelize(sanitizedName);

        // model name cannot use reserved keyword, e.g. return
        if (isReservedWord(camelizedName)) {
            final String modelName = "Model" + camelizedName;
            LOGGER.warn(
                    camelizedName + " (reserved word) cannot be used as model name. Renamed to " + modelName);
            return modelName;
        }

        // model name starts with number
        if (name.matches("^\\d.*")) {
            final String modelName =
                    "Model" + camelizedName; // e.g. 200Response => Model200Response (after camelize)
            LOGGER.warn(
                    name + " (model name starts with number) cannot be used as model name. Renamed to "
                            + modelName);
            return modelName;
        }

        return camelizedName;
    }

    @Override
    public Map<String, Object> postProcessModelsEnum(Map<String, Object> objs) {
        objs = super.postProcessModelsEnum(objs);
        List<Object> models = (List<Object>) objs.get("models");
        for (Object _mo : models) {
            Map<String, Object> mo = (Map<String, Object>) _mo;
            CodegenModel cm = (CodegenModel) mo.get("model");

            for (CodegenProperty var : cm.vars) {
                if (var.isEnum) {
                    List<Object> enumValues = (List<Object>) var.allowableValues.get("values");

                    for (final ListIterator<Object> i = enumValues.listIterator(); i.hasNext(); ) {
                        final String element = String.valueOf(i.next());
                        i.set(element.replaceAll("^\"|\"$", ""));
                    }
                }
            }
        }

        //Needed import for Gson based libraries
        if (additionalProperties.containsKey("gson")) {
            List<Map<String, String>> imports = (List<Map<String, String>>) objs.get("imports");

            for (Object _mo : models) {
                Map<String, Object> mo = (Map<String, Object>) _mo;
                CodegenModel cm = (CodegenModel) mo.get("model");
                // for enum model
                if (Boolean.TRUE.equals(cm.isEnum) && cm.allowableValues != null) {
                    cm.imports.add(importMapping.get("SerializedName"));
                    Map<String, String> item = new HashMap<String, String>();
                    item.put("import", importMapping.get("SerializedName"));
                    imports.add(item);
                }
            }
        }

        return objs;
    }

    @Override
    public Map<String, Object> postProcessOperationsWithModels(Map<String, Object> objs, List<Object> allModels) {
        Map<String, Object> operations = (Map<String, Object>) objs.get("operations");
        ArrayList<CodegenOperation> oplist = (ArrayList<CodegenOperation>) operations.get("operation");

        for (CodegenOperation codegenOperation : oplist) {
            String path = codegenOperation.path;
            codegenOperation.path = path.replaceAll("\\{", ":").replaceAll("}", "");
        }
        return objs;
    }


}
