/*
 * Copyright 2011 the original author or authors.
 *
 * Licensed 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.gradle.groovy.scripts.internal

import com.google.common.hash.HashCode
import org.gradle.api.Action
import org.gradle.api.internal.changedetection.state.CachingFileSnapshotter
import org.gradle.api.internal.changedetection.state.FileSnapshot
import org.gradle.api.internal.initialization.ClassLoaderIds
import org.gradle.api.internal.initialization.loadercache.ClassLoaderCache
import org.gradle.cache.CacheBuilder
import org.gradle.cache.CacheRepository
import org.gradle.cache.CacheValidator
import org.gradle.cache.PersistentCache
import org.gradle.groovy.scripts.Script
import org.gradle.groovy.scripts.ScriptSource
import org.gradle.groovy.scripts.Transformer
import org.gradle.internal.classloader.ClassLoaderHierarchyHasher
import org.gradle.internal.logging.progress.ProgressLogger
import org.gradle.internal.logging.progress.ProgressLoggerFactory
import org.gradle.internal.resource.TextResource
import spock.lang.Specification

class FileCacheBackedScriptClassCompilerTest extends Specification {
    final ScriptCompilationHandler scriptCompilationHandler = Mock()
    final CacheRepository cacheRepository = Mock()
    final CacheBuilder localCacheBuilder = Mock()
    final CacheBuilder globalCacheBuilder = Mock()
    final CacheValidator validator = Mock()
    final PersistentCache localCache = Mock()
    final PersistentCache globalCache = Mock()
    final ScriptSource source = Mock()
    final TextResource resource = Mock()
    final classLoader = Mock(ClassLoader)
    final Transformer transformer = Mock()
    final CompileOperation<?> operation = Mock()
    final CachingFileSnapshotter snapshotter = Mock()
    final ClassLoaderCache classLoaderCache = Mock()
    final classLoaderHierarchyHasher = Mock(ClassLoaderHierarchyHasher) {
        getLenientHash(classLoader) >> HashCode.fromLong(9999)
    }
    final File localDir = new File("local-dir")
    final File globalDir = new File("global-dir")
    final File classesDir = new File(globalDir, "classes")
    final File metadataDir = new File(globalDir, "metadata")
    final FileCacheBackedScriptClassCompiler compiler = new FileCacheBackedScriptClassCompiler(cacheRepository, validator, scriptCompilationHandler, Stub(ProgressLoggerFactory), snapshotter, classLoaderCache, classLoaderHierarchyHasher)
    final Action verifier = Stub()
    final CompiledScript compiledScript = Stub() {
        loadClass() >> Script
    }
    def classLoaderId = ClassLoaderIds.buildScript("foo", "bar")

    def setup() {
        _ * source.resource >> resource
        _ * resource.contentCached >> true
        _ * resource.text >> 'this is the script'
        _ * source.className >> 'ScriptClassName'
        _ * source.fileName >> 'ScriptFileName'
        _ * source.displayName >> 'Build Script'
        _ * operation.id >> 'TransformerId'
        _ * operation.transformer >> transformer
        _ * localCache.baseDir >> localDir
        _ * globalCache.baseDir >> globalDir
        _ * validator.isValid() >> true
    }

    def "loads classes from cache directory"() {
        def initializer

        when:
        def result = compiler.compile(source, classLoader, classLoaderId, operation, Script, verifier).loadClass()

        then:
        result == Script
        1 * snapshotter.snapshot(resource) >> Stub(FileSnapshot) { getHash() >> HashCode.fromString("0123") }
        1 * cacheRepository.cache({ it =~ "scripts-remapped/ScriptClassName/\\p{XDigit}+/TransformerId\\p{XDigit}+" }) >> localCacheBuilder
        1 * localCacheBuilder.withInitializer(!null) >> { args ->
            initializer = args[0]
            localCacheBuilder
        }
        1 * localCacheBuilder.withDisplayName(!null) >> localCacheBuilder
        1 * localCacheBuilder.withValidator(!null) >> localCacheBuilder
        1 * localCacheBuilder.open() >> {
            initializer.execute(localCache)
            localCache
        }

        1 * cacheRepository.cache({ it =~ "scripts/\\p{XDigit}+/TransformerId/TransformerId\\p{XDigit}+" }) >> globalCacheBuilder
        1 * globalCacheBuilder.withDisplayName(!null) >> globalCacheBuilder
        1 * globalCacheBuilder.withInitializer(!null) >> globalCacheBuilder
        1 * globalCacheBuilder.withValidator(!null) >> globalCacheBuilder
        1 * globalCacheBuilder.open() >> globalCache

        1 * scriptCompilationHandler.loadFromDir(source, _, classLoader, new File(localDir, 'classes'), new File(localDir, 'metadata'), operation, Script, classLoaderId) >> compiledScript
        0 * scriptCompilationHandler._
    }

    def "passes CacheValidator to cache builders"() {
        setup:
        snapshotter.snapshot(resource) >> Stub(FileSnapshot) { getHash() >> HashCode.fromString("0123") }
        cacheRepository.cache({ it =~ "scripts-remapped/ScriptClassName/\\p{XDigit}+/TransformerId\\p{XDigit}+" }) >> localCacheBuilder
        localCacheBuilder.withProperties(!null) >> localCacheBuilder
        localCacheBuilder.withInitializer(!null) >> localCacheBuilder
        localCacheBuilder.withDisplayName(!null) >> localCacheBuilder
        localCacheBuilder.open() >> localCache
        scriptCompilationHandler.loadFromDir(source, classLoader, classesDir, metadataDir, operation, Script, classLoaderId) >> compiledScript

        when:
        compiler.compile(source, classLoader, classLoaderId, operation, Script, verifier)

        then:
        1 * localCacheBuilder.withValidator(validator) >> localCacheBuilder
    }

    def "compiles classes to cache directory when cache is invalid"() {
        def initializer, globalInitializer
        def classesDir = classesDir
        def metadataDir = new File(globalDir, "metadata")
        def localMetadataDir = new File(localDir, "metadata")
        def localClassesDir = new File(localDir, "classes")

        when:
        def result = compiler.compile(source, classLoader, classLoaderId, operation, Script, verifier).loadClass()

        then:
        result == Script
        1 * snapshotter.snapshot(resource) >> Stub(FileSnapshot) { getHash() >> HashCode.fromString("0123") }
        1 * cacheRepository.cache({ it =~ "scripts-remapped/ScriptClassName/\\p{XDigit}+/TransformerId\\p{XDigit}+" }) >> localCacheBuilder
        1 * localCacheBuilder.withInitializer(!null) >> { args ->
            initializer = args[0]
            localCacheBuilder
        }
        1 * localCacheBuilder.withDisplayName(!null) >> localCacheBuilder
        1 * localCacheBuilder.withValidator(!null) >> localCacheBuilder
        1 * localCacheBuilder.open() >> {
            initializer.execute(localCache)
            localCache
        }

        1 * cacheRepository.cache({ it =~ "scripts/\\p{XDigit}+/TransformerId/TransformerId\\p{XDigit}+" }) >> globalCacheBuilder
        1 * globalCacheBuilder.withDisplayName(!null) >> globalCacheBuilder
        1 * globalCacheBuilder.withInitializer(!null) >> { args ->
            globalInitializer = args[0]
            globalCacheBuilder
        }
        1 * globalCacheBuilder.withValidator(!null) >> globalCacheBuilder
        1 * globalCacheBuilder.open() >> {
            globalInitializer.execute(globalCache)
            globalCache
        }

        1 * scriptCompilationHandler.compileToDir({ it instanceof RemappingScriptSource }, classLoader, classesDir, metadataDir, operation, Script, verifier)
        1 * scriptCompilationHandler.loadFromDir(source, _, classLoader, localClassesDir, localMetadataDir, operation, Script, classLoaderId) >> compiledScript
        0 * scriptCompilationHandler._
    }

    def "reports compilation progress even in case of a failure"() {
        def factory = Mock(ProgressLoggerFactory)
        def delegate = Mock(Action)
        def cache = Mock(PersistentCache)
        def logger = Mock(ProgressLogger)

        def initializer = new FileCacheBackedScriptClassCompiler.ProgressReportingInitializer(factory, delegate, 'Compile script into cache', 'Compiling script into cache')

        when:
        initializer.execute(cache)

        then:
        def ex = thrown(RuntimeException)
        ex.message == "Boo!"

        1 * factory.newOperation(FileCacheBackedScriptClassCompiler) >> logger
        1 * logger.start("Compile script into cache", "Compiling script into cache") >> logger

        then:
        1 * delegate.execute(cache) >> { throw new RuntimeException("Boo!") } //stress it a bit with a failure

        then:
        1 * logger.completed()
    }
}
