package be.klak.junit.jasmine;

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;

public class JasmineSpecRunnerGenerator {

    private enum TemplatePlaceholders {
        RELATIVE_PATH("<!--RelativePath-->"),
        SOURCE_FILES_TO_INCLUDE("<!--SourceFileIncludes-->"),
        SPEC_FILES_TO_INCLUDE("<!--SpecFileIncludes-->");

        private final String placeholder;

        private TemplatePlaceholders(String placeholder) {
            this.placeholder = placeholder;
        }

        public String getPlaceholder() {
            return placeholder;
        }

    }

    private final JasmineSuite suite;
    private final String[] jasmineSpecs;
    private final String outputPath;
    private final String outputFileName;

    public JasmineSpecRunnerGenerator(String[] jasmineSpecs, JasmineSuite suite, String outputPath, String outputFileName) {
        this.jasmineSpecs = jasmineSpecs;
        this.suite = suite;
        this.outputPath = outputPath;
        this.outputFileName = outputFileName;
    }

    public void generate() {
        // TODO hardcoded relative path stuff wat configureerbaar maken
        String template = loadTemplate();
        template = replaceRelativePathsForLibs(template);
        template = template.replaceAll(TemplatePlaceholders.SOURCE_FILES_TO_INCLUDE.getPlaceholder(),
                getJavascriptFileIncludes("./../../../main/webapp/js", suite.sources()));
        template = template.replaceAll(TemplatePlaceholders.SPEC_FILES_TO_INCLUDE.getPlaceholder(),
                getJavascriptFileIncludes("./../specs", jasmineSpecs));

        try {
            FileUtils.writeStringToFile(new File(outputPath + "/" + outputFileName), template);
        } catch (IOException e) {
            throw new RuntimeException("unable to write spec runner contents to destination", e);
        }
    }

    private String replaceRelativePathsForLibs(String template) {
        return template.replaceAll(TemplatePlaceholders.RELATIVE_PATH.getPlaceholder(), suite.jsRootDir());
    }

    private String getJavascriptFileIncludes(String path, String[] jsFiles) {
        StringBuilder sourceFileIncludes = new StringBuilder();
        for (String sourceFile : jsFiles) {
            sourceFileIncludes.append("\t\t<script type='text/javascript' src='" + path + "/" + sourceFile
                    + "'></script>\r\n");
        }
        return sourceFileIncludes.toString();
    }

    private String loadTemplate() {
        String template = null;
        try {
            template = FileUtils.readFileToString(new File(suite.jsRootDir() + "/lib/specRunner.tpl"));
        } catch (IOException e) {
            throw new RuntimeException("spec runner template file not found!", e);
        }
        return template;
    }
}