package io.swagger.codegen.languages;

import io.swagger.codegen.CliOption;
import io.swagger.codegen.CodegenConfig;
import io.swagger.codegen.CodegenConstants;
import io.swagger.codegen.CodegenType;
import io.swagger.codegen.DefaultCodegen;
import io.swagger.codegen.SupportingFile;
import io.swagger.models.properties.ArrayProperty;
import io.swagger.models.properties.BooleanProperty;
import io.swagger.models.properties.DateProperty;
import io.swagger.models.properties.DateTimeProperty;
import io.swagger.models.properties.DoubleProperty;
import io.swagger.models.properties.FloatProperty;
import io.swagger.models.properties.IntegerProperty;
import io.swagger.models.properties.LongProperty;
import io.swagger.models.properties.MapProperty;
import io.swagger.models.properties.Property;
import io.swagger.models.properties.StringProperty;

import java.io.File;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;

public class ScalaClientCodegen extends DefaultCodegen implements CodegenConfig {
    protected String invokerPackage = "io.swagger.client";
    protected String groupId = "io.swagger";
    protected String artifactId = "swagger-scala-client";
    protected String artifactVersion = "1.0.0";
    protected String sourceFolder = "src/main/scala";
    protected String authScheme = "";
    protected boolean authPreemptive;
    protected boolean asyncHttpClient = !authScheme.isEmpty();

    public ScalaClientCodegen() {
        super();
        outputFolder = "generated-code/scala";
        modelTemplateFiles.put("model.mustache", ".scala");
        apiTemplateFiles.put("api.mustache", ".scala");
        embeddedTemplateDir = templateDir = "scala";
        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.INVOKER_PACKAGE, invokerPackage);
        additionalProperties.put(CodegenConstants.GROUP_ID, groupId);
        additionalProperties.put(CodegenConstants.ARTIFACT_ID, artifactId);
        additionalProperties.put(CodegenConstants.ARTIFACT_VERSION, artifactVersion);
        additionalProperties.put("asyncHttpClient", asyncHttpClient);
        additionalProperties.put("authScheme", authScheme);
        additionalProperties.put("authPreemptive", authPreemptive);

        supportingFiles.add(new SupportingFile("pom.mustache", "", "pom.xml"));
        supportingFiles.add(new SupportingFile("apiInvoker.mustache",
                (sourceFolder + File.separator + invokerPackage).replace(".", java.io.File.separator), "ApiInvoker.scala"));
        supportingFiles.add(new SupportingFile("git_push.sh.mustache", "", "git_push.sh"));
        supportingFiles.add(new SupportingFile("gitignore.mustache", "", ".gitignore"));

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

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

        typeMapping = new HashMap<String, String>();
        typeMapping.put("enum", "NSString");
        typeMapping.put("array", "List");
        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");

        languageSpecificPrimitives = new HashSet<String>(
                Arrays.asList(
                        "String",
                        "boolean",
                        "Boolean",
                        "Double",
                        "Int",
                        "Long",
                        "Float",
                        "Object",
                        "Any",
                        "List",
                        "Map")
        );
        instantiationTypes.put("array", "ListBuffer");
        instantiationTypes.put("map", "HashMap");

        cliOptions.add(new CliOption(CodegenConstants.MODEL_PACKAGE, CodegenConstants.MODEL_PACKAGE_DESC));
        cliOptions.add(new CliOption(CodegenConstants.API_PACKAGE, CodegenConstants.API_PACKAGE_DESC));
    }

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

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

    @Override
    public String getHelp() {
        return "Generates a Scala client library.";
    }

    @Override
    public String escapeReservedWord(String name) {
        return "_" + name;
    }

    @Override
    public String apiFileFolder() {
        return outputFolder + "/" + sourceFolder + "/" + apiPackage().replace('.', File.separatorChar);
    }

    @Override
    public String modelFileFolder() {
        return outputFolder + "/" + sourceFolder + "/" + modelPackage().replace('.', File.separatorChar);
    }

    @Override
    public String getTypeDeclaration(Property p) {
        if (p instanceof ArrayProperty) {
            ArrayProperty ap = (ArrayProperty) p;
            Property inner = ap.getItems();
            return getSwaggerType(p) + "[" + getTypeDeclaration(inner) + "]";
        } else if (p instanceof MapProperty) {
            MapProperty mp = (MapProperty) p;
            Property inner = mp.getAdditionalProperties();

            return getSwaggerType(p) + "[String, " + getTypeDeclaration(inner) + "]";
        }
        return super.getTypeDeclaration(p);
    }

    @Override
    public String getSwaggerType(Property p) {
        String swaggerType = super.getSwaggerType(p);
        String type = null;
        if (typeMapping.containsKey(swaggerType)) {
            type = typeMapping.get(swaggerType);
            if (languageSpecificPrimitives.contains(type)) {
                return toModelName(type);
            }
        } else {
            type = swaggerType;
        }
        return toModelName(type);
    }

    @Override
    public String toInstantiationType(Property p) {
        if (p instanceof MapProperty) {
            MapProperty ap = (MapProperty) p;
            String inner = getSwaggerType(ap.getAdditionalProperties());
            return instantiationTypes.get("map") + "[String, " + inner + "]";
        } else if (p instanceof ArrayProperty) {
            ArrayProperty ap = (ArrayProperty) p;
            String inner = getSwaggerType(ap.getItems());
            return instantiationTypes.get("array") + "[" + inner + "]";
        } else {
            return null;
        }
    }

    @Override
    public String toDefaultValue(Property p) {
        if (p instanceof StringProperty) {
            return "null";
        } else if (p instanceof BooleanProperty) {
            return "null";
        } else if (p instanceof DateProperty) {
            return "null";
        } else if (p instanceof DateTimeProperty) {
            return "null";
        } else if (p instanceof DoubleProperty) {
            return "null";
        } else if (p instanceof FloatProperty) {
            return "null";
        } else if (p instanceof IntegerProperty) {
            return "null";
        } else if (p instanceof LongProperty) {
            return "null";
        } else if (p instanceof MapProperty) {
            MapProperty ap = (MapProperty) p;
            String inner = getSwaggerType(ap.getAdditionalProperties());
            return "new HashMap[String, " + inner + "]() ";
        } else if (p instanceof ArrayProperty) {
            ArrayProperty ap = (ArrayProperty) p;
            String inner = getSwaggerType(ap.getItems());
            return "new ListBuffer[" + inner + "]() ";
        } else {
            return "null";
        }
    }


    @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 Map<String, Object> postProcessModels(Map<String, Object> objs) {
        // remove model imports to avoid warnings for importing class in the same package in Scala
        List<Map<String, String>> imports = (List<Map<String, String>>) objs.get("imports");
        final String prefix = modelPackage() + ".";
        Iterator<Map<String, String>> iterator = imports.iterator();
        while (iterator.hasNext()) {
            String _import = iterator.next().get("import");
            if (_import.startsWith(prefix)) iterator.remove();
        }
        return objs;
    }

    @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;
        }

        // camelize (lower first character) the variable name
        // pet_id => petId
        name = camelize(name, true);

        // 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);
    }

    @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 String toModelFilename(String name) {
        // should be the same as the model name
        return toModelName(name);
    }

}
