/*
 * Copyright (c) 2021, WSO2 Inc. (http://www.wso2.com).
 *
 * WSO2 Inc. licenses this file to you 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.wso2.carbon.identity.api.server.branding.preference.management.v1.impl;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.wso2.carbon.identity.api.server.branding.preference.management.v1.BrandingPreferenceApiService;
import org.wso2.carbon.identity.api.server.branding.preference.management.v1.core.BrandingPreferenceManagementService;
import org.wso2.carbon.identity.api.server.branding.preference.management.v1.model.BrandingPreferenceModel;
import org.wso2.carbon.identity.api.server.common.ContextLoader;
import org.wso2.carbon.identity.api.server.common.error.APIError;
import org.wso2.carbon.identity.api.server.common.error.ErrorResponse;

import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import javax.ws.rs.core.Response;

import static org.wso2.carbon.identity.api.server.branding.preference.management.common.BrandingPreferenceManagementConstants.APPLICATION_TYPE;
import static org.wso2.carbon.identity.api.server.branding.preference.management.common.BrandingPreferenceManagementConstants.BRANDING_PREFERENCE_CONTEXT_PATH;
import static org.wso2.carbon.identity.api.server.branding.preference.management.common.BrandingPreferenceManagementConstants.CUSTOM_TYPE;
import static org.wso2.carbon.identity.api.server.branding.preference.management.common.BrandingPreferenceManagementConstants.DEFAULT_LOCALE;
import static org.wso2.carbon.identity.api.server.branding.preference.management.common.BrandingPreferenceManagementConstants.GET_PREFERENCE_COMPONENT_WITH_QUERY_PARAM;
import static org.wso2.carbon.identity.api.server.branding.preference.management.common.BrandingPreferenceManagementConstants.ORGANIZATION_TYPE;
import static org.wso2.carbon.identity.api.server.branding.preference.management.common.BrandingPreferenceManagementConstants.QUERY_PARAM_INDICATOR;
import static org.wso2.carbon.identity.api.server.common.Constants.V1_API_PATH_COMPONENT;
import static org.wso2.carbon.identity.api.server.common.ContextLoader.getTenantDomainFromContext;

/**
 * Implementation of branding preference management REST API.
 */
public class BrandingPreferenceApiServiceImpl implements BrandingPreferenceApiService {

    @Autowired
    private BrandingPreferenceManagementService brandingPreferenceManagementService;

    //TODO: Improve API to manage application level & language level theming resources in addition to the tenant level.

    @Override
    public Response addBrandingPreference(BrandingPreferenceModel brandingPreferenceModel) {

        if (StringUtils.isBlank(brandingPreferenceModel.getType().toString())) {
            return Response.status(Response.Status.BAD_REQUEST).build();
        }
        if (!ORGANIZATION_TYPE.equals(brandingPreferenceModel.getType().toString())) {
            return Response.status(Response.Status.NOT_IMPLEMENTED).entity("Not Implemented.").build();
        }
        if ((!DEFAULT_LOCALE.equals(brandingPreferenceModel.getLocale())) &&
                StringUtils.isNotBlank(brandingPreferenceModel.getLocale())) {
            return Response.status(Response.Status.NOT_IMPLEMENTED).entity("Not Implemented.").build();
        }

        BrandingPreferenceModel createdBrandingPreferenceModel =
                brandingPreferenceManagementService.addBrandingPreference(brandingPreferenceModel);
        URI location = null;
        try {
            location = ContextLoader.buildURIForHeader(V1_API_PATH_COMPONENT + BRANDING_PREFERENCE_CONTEXT_PATH
                    + QUERY_PARAM_INDICATOR + URLEncoder.encode(String.format(GET_PREFERENCE_COMPONENT_WITH_QUERY_PARAM,
                    ORGANIZATION_TYPE, getTenantDomainFromContext(), DEFAULT_LOCALE), StandardCharsets.UTF_8.name()));
        } catch (UnsupportedEncodingException e) {
            ErrorResponse errorResponse =
                    new ErrorResponse.Builder().withMessage("Error due to unsupported encoding.").build();
            throw new APIError(Response.Status.METHOD_NOT_ALLOWED, errorResponse);
        }
        return Response.created(location).entity(createdBrandingPreferenceModel).build();
    }

    @Override
    public Response deleteBrandingPreference(String type, String name, String locale) {

        if (type != null) {
            if (!(ORGANIZATION_TYPE.equals(type) || APPLICATION_TYPE.equals(type) || CUSTOM_TYPE.equals(type))) {
                return Response.status(Response.Status.BAD_REQUEST).build();
            }
            if (!ORGANIZATION_TYPE.equals(type)) {
                return Response.status(Response.Status.NOT_FOUND).build();
            }
        } else {
            type = ORGANIZATION_TYPE;
        }
        if (locale != null) {
            if (!DEFAULT_LOCALE.equals(locale)) {
                return Response.status(Response.Status.NOT_FOUND).build();
            }
        } else {
            locale = DEFAULT_LOCALE;
        }

        brandingPreferenceManagementService.deleteBrandingPreference(type, name, locale);
        return Response.noContent().build();
    }

    @Override
    public Response getBrandingPreference(String type, String name, String locale) {

        if (type != null) {
            if (!(ORGANIZATION_TYPE.equals(type) || APPLICATION_TYPE.equals(type) || CUSTOM_TYPE.equals(type))) {
                return Response.status(Response.Status.BAD_REQUEST).build();
            }
        }
        return Response.ok()
                .entity(brandingPreferenceManagementService.getBrandingPreference(type, name, locale)).build();
    }

    @Override
    public Response resolveBrandingPreference(String type, String name, String locale) {

        if (type != null) {
            if (!(ORGANIZATION_TYPE.equals(type) || APPLICATION_TYPE.equals(type) || CUSTOM_TYPE.equals(type))) {
                return Response.status(Response.Status.BAD_REQUEST).build();
            }
        }
        return Response.ok()
                .entity(brandingPreferenceManagementService.resolveBrandingPreference(type, name, locale)).build();
    }

    @Override
    public Response updateBrandingPreference(BrandingPreferenceModel brandingPreferenceModel) {

        if (StringUtils.isBlank(brandingPreferenceModel.getType().toString())) {
            return Response.status(Response.Status.BAD_REQUEST).build();
        }
        if (!ORGANIZATION_TYPE.equals(brandingPreferenceModel.getType().toString())) {
            return Response.status(Response.Status.NOT_FOUND).build();
        }
        if ((!DEFAULT_LOCALE.equals(brandingPreferenceModel.getLocale())) &&
                StringUtils.isNotBlank(brandingPreferenceModel.getLocale())) {
            return Response.status(Response.Status.NOT_FOUND).build();
        }

        BrandingPreferenceModel updatedBrandingPreferenceModel =
                brandingPreferenceManagementService.updateBrandingPreference(brandingPreferenceModel);
        return Response.ok().entity(updatedBrandingPreferenceModel).build();
    }
}
