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package org.apereo.cas.web.view;

import org.apereo.cas.configuration.CasConfigurationProperties;
import org.apereo.cas.util.HttpRequestUtils;

import lombok.Getter;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.servlet.ThemeResolver;
import org.thymeleaf.IEngineConfiguration;
import org.thymeleaf.templateresolver.FileTemplateResolver;
import org.thymeleaf.templateresource.ITemplateResource;

import java.util.Map;

/**
 * This is {@link ThemeFileTemplateResolver}.
 *
 * @author Misagh Moayyed
 * @since 5.3.0
 */
@RequiredArgsConstructor
@Getter
@Slf4j
public class ThemeFileTemplateResolver extends FileTemplateResolver {
    /**
     * CAS settings.
     */
    protected final CasConfigurationProperties casProperties;

    /**
     * Theme resolver.
     */
    protected final ThemeResolver themeResolver;

    @Override
    protected ITemplateResource computeTemplateResource(final IEngineConfiguration configuration, final String ownerTemplate,
                                                        final String template, final String resourceName, final String characterEncoding,
                                                        final Map templateResolutionAttributes) {
        val request = HttpRequestUtils.getHttpServletRequestFromRequestAttributes();
        val themeName = this.themeResolver.resolveThemeName(request);

        if (StringUtils.isNotBlank(themeName)) {
            val themeTemplate = String.format(resourceName, themeName);
            LOGGER.trace("Computing template resource [{}]...", themeTemplate);
            return super.computeTemplateResource(configuration, ownerTemplate, template,
                themeTemplate, characterEncoding, templateResolutionAttributes);
        }
        return super.computeTemplateResource(configuration, ownerTemplate, template,
            resourceName, characterEncoding, templateResolutionAttributes);
    }
}