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/* 
 * Copyright 2019 The Kathra Authors.
 *
 * 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.
 *
 * Contributors:
 *
 *    IRT SystemX (https://www.kathra.org/)    
 *
 */

package org.kathra.codegen.config;

import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import org.kathra.codegen.CliOption;
import org.kathra.codegen.ClientOptInput;
import org.kathra.codegen.ClientOpts;
import org.kathra.codegen.CodegenConfig;
import org.kathra.codegen.CodegenConfigLoader;
import org.kathra.codegen.CodegenConstants;
import org.kathra.codegen.auth.AuthParser;
import io.swagger.models.Swagger;
import io.swagger.models.auth.AuthorizationValue;
import io.swagger.parser.SwaggerParser;
import io.swagger.util.Json;
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.nio.file.Paths;
import java.util.*;

import static org.apache.commons.lang3.StringUtils.isNotEmpty;

/**
 * A class that contains all codegen configuration properties a user would want to manipulate.
 * An instance could be created by deserializing a JSON file or being populated from CLI or Maven plugin parameters.
 * It also has a convenience method for creating a ClientOptInput class which is THE object DefaultGenerator.java needs
 * to generate code.
 */
public class CodegenConfigurator implements Serializable {

    public static final Logger LOGGER = LoggerFactory.getLogger(CodegenConfigurator.class);

    private String lang;
    private String inputSpec;
    private String outputDir;
    private boolean verbose;
    private boolean skipOverwrite;
    private boolean removeOperationIdPrefix;
    private String templateDir;
    private String auth;
    private String apiPackage;
    private String modelPackage;
    private String invokerPackage;
    private String modelNamePrefix;
    private String modelNameSuffix;
    private String repositoryUrl;
    private String repositoryPythonName;

    private String groupId;
    private String artifactId;
    private String artifactVersion;

    private String groupIdApi;
    private String artifactIdApi;
    private String artifactVersionApi;

    private String library;
    private String ignoreFileOverride;
    private Map systemProperties = new HashMap();
    private Map instantiationTypes = new HashMap();
    private Map typeMappings = new HashMap();
    private Map additionalProperties = new HashMap();
    private Map importMappings = new HashMap();
    private Set languageSpecificPrimitives = new HashSet();
    private Map  reservedWordMappings = new HashMap();

    private String gitUserId="GIT_USER_ID";
    private String gitRepoId="GIT_REPO_ID";
    private String releaseNote="Minor update";
    private String httpUserAgent;

    private final Map dynamicProperties = new HashMap(); //the map that holds the JsonAnySetter/JsonAnyGetter values

    public CodegenConfigurator() {
        this.setOutputDir(".");
    }

    public CodegenConfigurator setLang(String lang) {
        this.lang = lang;
        return this;
    }

    public CodegenConfigurator setInputSpec(String inputSpec) {
        this.inputSpec = inputSpec;
        return this;
    }

    public String getInputSpec() {
        return inputSpec;
    }

    public String getOutputDir() {
        return outputDir;
    }

    public CodegenConfigurator setOutputDir(String outputDir) {
        this.outputDir = toAbsolutePathStr(outputDir);
        return this;
    }

    public String getModelPackage() {
        return modelPackage;
    }

    public CodegenConfigurator setModelPackage(String modelPackage) {
        this.modelPackage = modelPackage;
        return this;
    }

    public String getModelNamePrefix() {
        return modelNamePrefix;
    }

    public CodegenConfigurator setModelNamePrefix(String prefix) {
        this.modelNamePrefix = prefix;
        return this;
    }

    public boolean getRemoveOperationIdPrefix() {
        return removeOperationIdPrefix;
    }

    public CodegenConfigurator setRemoveOperationIdPrefix(boolean removeOperationIdPrefix) {
        this.removeOperationIdPrefix = removeOperationIdPrefix;
        return this;
    }

    public String getModelNameSuffix() {
        return modelNameSuffix;
    }

    public CodegenConfigurator setModelNameSuffix(String suffix) {
        this.modelNameSuffix = suffix;
        return this;
    }

    public boolean isVerbose() {
        return verbose;
    }

    public CodegenConfigurator setVerbose(boolean verbose) {
        this.verbose = verbose;
        return this;
    }

    public boolean isSkipOverwrite() {
        return skipOverwrite;
    }

    public CodegenConfigurator setSkipOverwrite(boolean skipOverwrite) {
        this.skipOverwrite = skipOverwrite;
        return this;
    }

    public String getLang() {
        return lang;
    }

    public String getTemplateDir() {
        return templateDir;
    }

    public CodegenConfigurator setTemplateDir(String templateDir) {
        File f = new File(templateDir);

        // check to see if the folder exists
        if (!(f.exists() && f.isDirectory())) {
            throw new IllegalArgumentException("Template directory " + templateDir + " does not exist.");
        }

        this.templateDir = f.getAbsolutePath();
        return this;
    }

    public String getAuth() {
        return auth;
    }

    public CodegenConfigurator setAuth(String auth) {
        this.auth = auth;
        return this;
    }

    public String getApiPackage() {
        return apiPackage;
    }

    public CodegenConfigurator setApiPackage(String apiPackage) {
        this.apiPackage = apiPackage;
        return this;
    }

    public String getInvokerPackage() {
        return invokerPackage;
    }

    public CodegenConfigurator setInvokerPackage(String invokerPackage) {
        this.invokerPackage = invokerPackage;
        return this;
    }

    public String getRepositoryUrl() {
        return repositoryUrl;
    }

    public CodegenConfigurator setRepositoryUrl(String repositoryUrl) {
        this.repositoryUrl = repositoryUrl;
        return this;
    }

    public String getRepositoryPythonName() {
        return repositoryPythonName;
    }

    public CodegenConfigurator setRepositoryPythonName(String repositoryPythonName) {
        this.repositoryPythonName = repositoryPythonName;
        return this;
    }

    public String getGroupId() {
        return groupId;
    }

    public CodegenConfigurator setGroupId(String groupId) {
        this.groupId = groupId;
        return this;
    }

    public String getArtifactId() {
        return artifactId;
    }

    public CodegenConfigurator setArtifactId(String artifactId) {
        this.artifactId = artifactId;
        return this;
    }

    public String getArtifactVersion() {
        return artifactVersion;
    }

    public CodegenConfigurator setArtifactVersion(String artifactVersion) {
        this.artifactVersion = artifactVersion;
        return this;
    }

    public String getGroupIdApi() {
        return groupIdApi;
    }

    public CodegenConfigurator setGroupIdApi(String groupIdApi) {
        this.groupIdApi = groupIdApi;
        return this;
    }

    public String getArtifactIdApi() {
        return artifactIdApi;
    }

    public CodegenConfigurator setArtifactIdApi(String artifactIdApi) {
        this.artifactIdApi = artifactIdApi;
        return this;
    }

    public String getArtifactVersionApi() {
        return artifactVersionApi;
    }

    public CodegenConfigurator setArtifactVersionApi(String artifactVersionApi) {
        this.artifactVersionApi = artifactVersionApi;
        return this;
    }


    public Map getSystemProperties() {
        return systemProperties;
    }

    public CodegenConfigurator setSystemProperties(Map systemProperties) {
        this.systemProperties = systemProperties;
        return this;
    }

    public CodegenConfigurator addSystemProperty(String key, String value) {
        this.systemProperties.put(key, value);
        return this;
    }

    public Map getInstantiationTypes() {
        return instantiationTypes;
    }

    public CodegenConfigurator setInstantiationTypes(Map instantiationTypes) {
        this.instantiationTypes = instantiationTypes;
        return this;
    }

    public CodegenConfigurator addInstantiationType(String key, String value) {
        this.instantiationTypes.put(key, value);
        return this;
    }

    public Map getTypeMappings() {
        return typeMappings;
    }

    public CodegenConfigurator setTypeMappings(Map typeMappings) {
        this.typeMappings = typeMappings;
        return this;
    }

    public CodegenConfigurator addTypeMapping(String key, String value) {
        this.typeMappings.put(key, value);
        return this;
    }

    public Map getAdditionalProperties() {
        return additionalProperties;
    }

    public CodegenConfigurator setAdditionalProperties(Map additionalProperties) {
        this.additionalProperties = additionalProperties;
        return this;
    }

    public CodegenConfigurator addAdditionalProperty(String key, Object value) {
        this.additionalProperties.put(key, value);
        return this;
    }

    public Map getImportMappings() {
        return importMappings;
    }

    public CodegenConfigurator setImportMappings(Map importMappings) {
        this.importMappings = importMappings;
        return this;
    }

    public CodegenConfigurator addImportMapping(String key, String value) {
        this.importMappings.put(key, value);
        return this;
    }

    public Set getLanguageSpecificPrimitives() {
        return languageSpecificPrimitives;
    }

    public CodegenConfigurator setLanguageSpecificPrimitives(Set languageSpecificPrimitives) {
        this.languageSpecificPrimitives = languageSpecificPrimitives;
        return this;
    }

    public CodegenConfigurator addLanguageSpecificPrimitive(String value) {
        this.languageSpecificPrimitives.add(value);
        return this;
    }

    public String getLibrary() {
        return library;
    }

    public CodegenConfigurator setLibrary(String library) {
        this.library = library;
        return this;
    }

    public String getGitUserId() {
        return gitUserId;
    }

    public CodegenConfigurator setGitUserId(String gitUserId) {
        this.gitUserId = gitUserId;
        return this;
    }

    public String getGitRepoId() {
        return gitRepoId;
    }

    public CodegenConfigurator setGitRepoId(String gitRepoId) {
        this.gitRepoId = gitRepoId;
        return this;
    }

    public String getReleaseNote() {
        return releaseNote;
    }

    public CodegenConfigurator setReleaseNote(String releaseNote) {
        this.releaseNote = releaseNote;
        return this;
    }

    public String getHttpUserAgent() {
        return httpUserAgent;
    }

    public CodegenConfigurator setHttpUserAgent(String httpUserAgent) {
        this.httpUserAgent= httpUserAgent;
        return this;
    }

    public  Map getReservedWordsMappings() {
        return reservedWordMappings;
    }

    public CodegenConfigurator setReservedWordsMappings(Map reservedWordsMappings) {
        this.reservedWordMappings = reservedWordsMappings;
        return this;
    }

    public CodegenConfigurator addAdditionalReservedWordMapping(String key, String value) {
        this.reservedWordMappings.put(key, value);
        return this;
    }

    public String getIgnoreFileOverride() {
        return ignoreFileOverride;
    }

    public CodegenConfigurator setIgnoreFileOverride(final String ignoreFileOverride) {
        this.ignoreFileOverride = ignoreFileOverride;
        return this;
    }

    public ClientOptInput toClientOptInput() {

        Validate.notEmpty(lang, "language must be specified");
        Validate.notEmpty(inputSpec, "input spec must be specified");

        setVerboseFlags();
        setSystemProperties();

        CodegenConfig config = CodegenConfigLoader.forName(lang);

        config.setInputSpec(inputSpec);
        config.setOutputDir(outputDir);
        config.setSkipOverwrite(skipOverwrite);
        config.setIgnoreFilePathOverride(ignoreFileOverride);
        config.setRemoveOperationIdPrefix(removeOperationIdPrefix);

        config.instantiationTypes().putAll(instantiationTypes);
        config.typeMapping().putAll(typeMappings);
        config.importMapping().putAll(importMappings);
        config.languageSpecificPrimitives().addAll(languageSpecificPrimitives);
        config.reservedWordsMappings().putAll(reservedWordMappings);

        checkAndSetAdditionalProperty(apiPackage, CodegenConstants.API_PACKAGE);
        checkAndSetAdditionalProperty(modelPackage, CodegenConstants.MODEL_PACKAGE);
        checkAndSetAdditionalProperty(invokerPackage, CodegenConstants.INVOKER_PACKAGE);
        checkAndSetAdditionalProperty(repositoryUrl, CodegenConstants.REPOSITORY_URL);
        checkAndSetAdditionalProperty(repositoryPythonName, CodegenConstants.REPOSITORY_PYTHON_NAME);

        checkAndSetAdditionalProperty(groupId, CodegenConstants.GROUP_ID);
        checkAndSetAdditionalProperty(artifactId, CodegenConstants.ARTIFACT_ID);
        checkAndSetAdditionalProperty(artifactVersion, CodegenConstants.ARTIFACT_VERSION);

        additionalProperties.put(CodegenConstants.GROUP_ID_API, groupIdApi);
        additionalProperties.put(CodegenConstants.ARTIFACT_ID_API, artifactIdApi);
        additionalProperties.put(CodegenConstants.ARTIFACT_VERSION_API, artifactVersionApi);

        checkAndSetAdditionalProperty(templateDir, toAbsolutePathStr(templateDir), CodegenConstants.TEMPLATE_DIR);
        checkAndSetAdditionalProperty(modelNamePrefix, CodegenConstants.MODEL_NAME_PREFIX);
        checkAndSetAdditionalProperty(modelNameSuffix, CodegenConstants.MODEL_NAME_SUFFIX);
        checkAndSetAdditionalProperty(gitUserId, CodegenConstants.GIT_USER_ID);
        checkAndSetAdditionalProperty(gitRepoId, CodegenConstants.GIT_REPO_ID);
        checkAndSetAdditionalProperty(releaseNote, CodegenConstants.RELEASE_NOTE);
        checkAndSetAdditionalProperty(httpUserAgent, CodegenConstants.HTTP_USER_AGENT);

        handleDynamicProperties(config);

        if (isNotEmpty(library)) {
            config.setLibrary(library);
        }

        config.additionalProperties().putAll(additionalProperties);

        ClientOptInput input = new ClientOptInput()
                .config(config);

        final List authorizationValues = AuthParser.parse(auth);

        Swagger swagger = new SwaggerParser().read(inputSpec, authorizationValues, true);

        input.opts(new ClientOpts())
                .swagger(swagger);

        return input;
    }

    @JsonAnySetter
    public CodegenConfigurator addDynamicProperty(String name, Object value) {
        dynamicProperties.put(name, value);
        return this;
    }

    @JsonAnyGetter
    public Map getDynamicProperties() {
        return dynamicProperties;
    }

    private void handleDynamicProperties(CodegenConfig codegenConfig) {
        for (CliOption langCliOption : codegenConfig.cliOptions()) {
            String opt = langCliOption.getOpt();
            if (dynamicProperties.containsKey(opt)) {
                codegenConfig.additionalProperties().put(opt, dynamicProperties.get(opt));
            }
            else if(systemProperties.containsKey(opt)) {
                codegenConfig.additionalProperties().put(opt, systemProperties.get(opt));
            }
        }
    }

    private void setVerboseFlags() {
        if (!verbose) {
            return;
        }
        LOGGER.info("\nVERBOSE MODE: ON. Additional debug options are injected" +
                "\n - [debugSwagger] prints the swagger specification as interpreted by the codegen" +
                "\n - [debugModels] prints models passed to the template engine" +
                "\n - [debugOperations] prints operations passed to the template engine" +
                "\n - [debugSupportingFiles] prints additional data passed to the template engine");

        System.setProperty("debugSwagger", "");
        System.setProperty("debugModels", "");
        System.setProperty("debugOperations", "");
        System.setProperty("debugSupportingFiles", "");
    }

    private void setSystemProperties() {
        for (Map.Entry entry : systemProperties.entrySet()) {
            System.setProperty(entry.getKey(), entry.getValue());
        }
    }

    private static String toAbsolutePathStr(String path) {
        if (isNotEmpty(path)) {
            return Paths.get(path).toAbsolutePath().toString();
        }

        return path;

    }

    private void checkAndSetAdditionalProperty(String property, String propertyKey) {
        checkAndSetAdditionalProperty(property, property, propertyKey);
    }

    private void checkAndSetAdditionalProperty(String property, String valueToSet, String propertyKey) {
        if (isNotEmpty(property)) {
            additionalProperties.put(propertyKey, valueToSet);
        }
    }

    public static CodegenConfigurator fromFile(String configFile) {

        if (isNotEmpty(configFile)) {
            try {
                return Json.mapper().readValue(new File(configFile), CodegenConfigurator.class);
            } catch (IOException e) {
                LOGGER.error("Unable to deserialize config file: " + configFile, e);
            }
        }
        return null;
    }

}




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