def fileCheck = { parsedJson, folder ->
    def folderNames = parsedJson.collect { it.foldername }
    def folders = []
    folder.eachDir {
        folders << it.name
    }
    def disjunct = (folders + folderNames) - folders.intersect(folderNames)
    def missingFromFolders = folderNames.intersect(disjunct)
    def missingFromJson = folders.intersect(disjunct)

    if (!missingFromFolders.empty || !missingFromJson.empty) {
        StringBuilder missingString = new StringBuilder();
        missingString.append("Missing From Folders\n")
        for (String symbol : missingFromFolders) {
            missingString.append(symbol);
            missingString.append('\n');
        }
        missingString.append("\nMissing from JSON\n")
        for (String symbol : missingFromJson) {
            missingString.append(symbol);
            missingString.append('\n');
        }
        throw new GradleException("Found missing items\n" + missingString.toString());
    }
}

task checkTemplates(type: Task) {
    doLast {
        def parsedJson = new groovy.json.JsonSlurper().parseText(templateFile.text)
        fileCheck(parsedJson, templateDirectory)
        parsedJson.each {
            assert it.name != null
            assert it.description != null
            assert it.tags != null
            assert it.foldername != null
            assert it.gradlebase != null
            if (it.gradlebase == 'java') {
                assert it.mainclass != null
            }
        }
    }
}

task checkExamples(type: Task) {
    doLast {
        def parsedJson = new groovy.json.JsonSlurper().parseText(exampleFile.text)
        fileCheck(parsedJson, exampleDirectory)
        parsedJson.each {
            assert it.name != null
            assert it.description != null
            assert it.tags != null
            assert it.foldername != null
            assert it.gradlebase != null
            if (it.gradlebase == 'java') {
                assert it.mainclass != null
            }
        }
    }
}

task checkCommands(type: Task) {
    doLast {
        def parsedJson = new groovy.json.JsonSlurper().parseText(commandFile.text)
        fileCheck(parsedJson, commandDirectory)
        parsedJson.each {
            assert it.name != null
            assert it.description != null
            assert it.tags != null
            assert it.foldername != null
            assert it.replacename != null
            if (project.isCppCommands) {
                assert it.headers != null
                assert !it.headers.isEmpty()
                assert it.source != null
                assert !it.source.isEmpty()
            }
        }
    }
}

check.dependsOn checkTemplates
check.dependsOn checkExamples
check.dependsOn checkCommands