package io.swagger.codegen.languages;

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.MapProperty;
import io.swagger.models.properties.Property;
import io.swagger.codegen.CliOption;

import java.io.File;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;

public class CsharpDotNet2ClientCodegen extends DefaultCodegen implements CodegenConfig {
    public static final String CLIENT_PACKAGE = "clientPackage";
    protected String packageName = "IO.Swagger";
    protected String packageVersion = "1.0.0";
    protected String clientPackage = "IO.Swagger.Client";
    protected String sourceFolder = "src" + File.separator + "main" + File.separator + "CsharpDotNet2";

    public CsharpDotNet2ClientCodegen() {
        super();
        outputFolder = "generated-code" + File.separator + "CsharpDotNet2";
        modelTemplateFiles.put("model.mustache", ".cs");
        apiTemplateFiles.put("api.mustache", ".cs");
        embeddedTemplateDir = templateDir = "CsharpDotNet2";
        apiPackage = "IO.Swagger.Api";
        modelPackage = "IO.Swagger.Model";

        setReservedWordsLowerCase(
                Arrays.asList(
                    // local variable names in API methods (endpoints)
                    "path", "queryParams", "headerParams", "formParams", "fileParams", "postBody",
                    "authSettings", "response", "StatusCode",
                    // C# reserved word
                    "abstract", "as", "base", "bool", "break", "byte", "case", "catch", "char", "checked", "class", "const", "continue", "decimal", "default", "delegate", "do", "double", "else", "enum", "event", "explicit", "extern", "false", "finally", "fixed", "float", "for", "foreach", "goto", "if", "implicit", "in", "int", "interface", "internal", "is", "lock", "long", "namespace", "new", "null", "object", "operator", "out", "override", "params", "private", "protected", "public", "readonly", "ref", "return", "sbyte", "sealed", "short", "sizeof", "stackalloc", "static", "string", "struct", "switch", "this", "throw", "true", "try", "typeof", "uint", "ulong", "unchecked", "unsafe", "ushort", "using", "virtual", "void", "volatile", "while")
        );


        languageSpecificPrimitives = new HashSet<String>(
                Arrays.asList(
                        "String",
                        "string",
                        "bool?",
                        "double?",
                        "int?",
                        "long?",
                        "float?",
                        "byte[]",
                        "List",
                        "Dictionary",
                        "DateTime?",
                        "String",
                        "Boolean",
                        "Double",
                        "Integer",
                        "Long",
                        "Float",
                        "Stream", // not really a primitive, we include it to avoid model import
                        "Object")
        );
        instantiationTypes.put("array", "List");
        instantiationTypes.put("map", "Dictionary");

        typeMapping = new HashMap<String, String>();
        typeMapping.put("string", "string");
        typeMapping.put("boolean", "bool?");
        typeMapping.put("integer", "int?");
        typeMapping.put("float", "float?");
        typeMapping.put("long", "long?");
        typeMapping.put("double", "double?");
        typeMapping.put("number", "double?");
        typeMapping.put("datetime", "DateTime?");
        typeMapping.put("date", "DateTime?");
        typeMapping.put("file", "Stream");
        typeMapping.put("array", "List");
        typeMapping.put("list", "List");
        typeMapping.put("map", "Dictionary");
        typeMapping.put("object", "Object");

        cliOptions.clear();
        cliOptions.add(new CliOption(CodegenConstants.PACKAGE_NAME, "C# package name (convention: Camel.Case).")
                .defaultValue("IO.Swagger"));
        cliOptions.add(new CliOption(CodegenConstants.PACKAGE_VERSION, "C# package version.").defaultValue("1.0.0"));
        cliOptions.add(new CliOption(CLIENT_PACKAGE, "C# client package name (convention: Camel.Case).")
                .defaultValue("IO.Swagger.Client"));
    }

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

        if (additionalProperties.containsKey(CodegenConstants.PACKAGE_VERSION)) {
            setPackageVersion((String) additionalProperties.get(CodegenConstants.PACKAGE_VERSION));
        } else {
            additionalProperties.put(CodegenConstants.PACKAGE_VERSION, packageVersion);
        }

        if (additionalProperties.containsKey(CodegenConstants.PACKAGE_NAME)) {
            setPackageName((String) additionalProperties.get(CodegenConstants.PACKAGE_NAME));
            apiPackage = packageName + ".Api";
            modelPackage = packageName + ".Model";
            clientPackage = packageName + ".Client";
        } else {
            additionalProperties.put(CodegenConstants.PACKAGE_NAME, packageName);
        }

        if (additionalProperties.containsKey(CLIENT_PACKAGE)) {
            this.setClientPackage((String) additionalProperties.get(CLIENT_PACKAGE));
        } else {
            additionalProperties.put(CLIENT_PACKAGE, clientPackage);
        }

        supportingFiles.add(new SupportingFile("Configuration.mustache",
                sourceFolder + File.separator + clientPackage.replace(".", java.io.File.separator), "Configuration.cs"));
        supportingFiles.add(new SupportingFile("ApiClient.mustache",
                sourceFolder + File.separator + clientPackage.replace(".", java.io.File.separator), "ApiClient.cs"));
        supportingFiles.add(new SupportingFile("ApiException.mustache",
                sourceFolder + File.separator + clientPackage.replace(".", java.io.File.separator), "ApiException.cs"));
        supportingFiles.add(new SupportingFile("packages.config.mustache", "vendor", "packages.config"));
        supportingFiles.add(new SupportingFile("compile-mono.sh.mustache", "", "compile-mono.sh"));
        supportingFiles.add(new SupportingFile("README.md", "", "README.md"));

    }

    public void setClientPackage(String clientPackage) {
        this.clientPackage = clientPackage;
    }

    public void setPackageName(String packageName) {
        this.packageName = packageName;
    }

    public void setPackageVersion(String packageVersion) {
        this.packageVersion = packageVersion;
    }

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

    @Override
    public String getName() {
        return "CsharpDotNet2";
    }

    @Override
    public String getHelp() {
        return "Generates a C# .Net 2.0 client library.";
    }

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

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

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

    @Override
    public String toVarName(String name) {
        // replace - with _ e.g. created-at => created_at
        name = name.replaceAll("-", "_"); // FIXME: a parameter should not be assigned. Also declare the methods parameters as 'final'.

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

        // camelize the variable name
        // pet_id => PetId
        name = camelize(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) {
        // replace - with _ e.g. created-at => created_at
        name = name.replaceAll("-", "_");

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

        // camelize(lower) 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 toModelName(String name) {
        name = sanitizeName(name);

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

        // camelize the model name
        // phone_number => PhoneNumber
        return camelize(name);
    }

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


    @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.toLowerCase())) {
            type = typeMapping.get(swaggerType.toLowerCase());
            if (languageSpecificPrimitives.contains(type)) {
                return type;
            }
        } else {
            type = swaggerType;
        }
        return toModelName(type);
    }

    @Override
    public String toOperationId(String operationId) {
        // 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);
    }

}
