/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF 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.apache.groovy.gradle

import groovy.text.markup.MarkupTemplateEngine
import groovy.text.markup.TemplateConfiguration
import groovy.transform.CompileDynamic
import groovy.transform.CompileStatic
import groovy.xml.slurpersupport.GPathResult
import groovy.xml.XmlSlurper
import org.gradle.api.DefaultTask
import org.gradle.api.file.ConfigurableFileCollection
import org.gradle.api.file.RegularFileProperty
import org.gradle.api.tasks.CacheableTask
import org.gradle.api.tasks.InputFile
import org.gradle.api.tasks.InputFiles
import org.gradle.api.tasks.OutputFile
import org.gradle.api.tasks.PathSensitive
import org.gradle.api.tasks.PathSensitivity
import org.gradle.api.tasks.SkipWhenEmpty
import org.gradle.api.tasks.TaskAction

@CompileStatic
@CacheableTask
class CheckstyleHtmlReport extends DefaultTask {
    @InputFiles
    @SkipWhenEmpty
    @PathSensitive(PathSensitivity.RELATIVE)
    final ConfigurableFileCollection source = project.objects.fileCollection()

    @InputFile
    @PathSensitive(PathSensitivity.RELATIVE)
    final RegularFileProperty configFile = project.objects.fileProperty()

    @InputFiles
    @SkipWhenEmpty
    @PathSensitive(PathSensitivity.RELATIVE)
    final RegularFileProperty checkstyleReportFile = project.objects.fileProperty()

    @OutputFile
    final RegularFileProperty outputFile = project.objects.fileProperty()

    @TaskAction
    void generateHtmlReport() {
        def configFile = this.configFile.get().asFile
        def configDir = configFile.parentFile
        def reportFile = checkstyleReportFile.get().asFile
        if (!reportFile || !reportFile.exists()) return // @SkipWhenEmpty not working?
        def htmlReportFile = outputFile.get().asFile
        def templateConfiguration = new TemplateConfiguration()
        templateConfiguration.with {
            autoIndent = true
            autoNewLine = true
        }
        def engine = new MarkupTemplateEngine(this.class.classLoader, configDir, templateConfiguration)
        def xml = new XmlSlurper().parse(reportFile.newReader('utf-8'))
        def model = buildModel(xml)
        htmlReportFile.parentFile.mkdirs()
        htmlReportFile.withWriter('utf-8') { wrt ->
            engine.createTemplateByPath('checkstyle-report.groovy').make(model).writeTo(wrt)
        }
    }

    @CompileDynamic
    private Map<String, Object> buildModel(GPathResult xml) {
        def files = []
        xml.file.each { f ->
            if (f.error.size() && !f.@name.toString().matches('.*[/\\\\]generated[/\\\\].*')) {
                files << [
                        name: f.@name.toString(),
                        errors: f.error.collect { e ->
                            def rule = e.@source.toString()
                            rule = rule.substring(rule.lastIndexOf('.') + 1)
                            [line: e.@line.toString(),
                             column: e.@column.toString(),
                             message: e.@message.toString(),
                             source: rule,
                             severity: e.@severity.toString()]
                        }]
            }
        }
        def model = [
                project: project,
                files: files
        ]
        model
    }
}
