// Copyright 2018 Google Inc. All rights reserved.
//
// 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 java

import (
	"android/soong/android"
	"android/soong/dexpreopt"
)

type dexpreopterInterface interface {
	IsInstallable() bool // Structs that embed dexpreopter must implement this.
	dexpreoptDisabled(ctx android.BaseModuleContext) bool
}

type dexpreopter struct {
	dexpreoptProperties DexpreoptProperties

	installPath         android.InstallPath
	uncompressedDex     bool
	isSDKLibrary        bool
	isApp               bool
	isTest              bool
	isPresignedPrebuilt bool

	manifestFile        android.Path
	statusFile          android.WritablePath
	enforceUsesLibs     bool
	classLoaderContexts dexpreopt.ClassLoaderContextMap

	builtInstalled string

	// A path to a dexpreopt.config file generated by Soong for libraries that may be used as a
	// <uses-library> by Make modules. The path is passed to Make via LOCAL_SOONG_DEXPREOPT_CONFIG
	// variable. If the path is nil, no config is generated (which is the case for apps and tests).
	configPath android.WritablePath
}

type DexpreoptProperties struct {
	Dex_preopt struct {
		// If false, prevent dexpreopting.  Defaults to true.
		Enabled *bool

		// If true, generate an app image (.art file) for this module.
		App_image *bool

		// If true, use a checked-in profile to guide optimization.  Defaults to false unless
		// a matching profile is set or a profile is found in PRODUCT_DEX_PREOPT_PROFILE_DIR
		// that matches the name of this module, in which case it is defaulted to true.
		Profile_guided *bool

		// If set, provides the path to profile relative to the Android.bp file.  If not set,
		// defaults to searching for a file that matches the name of this module in the default
		// profile location set by PRODUCT_DEX_PREOPT_PROFILE_DIR, or empty if not found.
		Profile *string `android:"path"`
	}
}

func init() {
	dexpreopt.DexpreoptRunningInSoong = true
}

func (d *dexpreopter) dexpreoptDisabled(ctx android.BaseModuleContext) bool {
	global := dexpreopt.GetGlobalConfig(ctx)

	if global.DisablePreopt {
		return true
	}

	if inList(ctx.ModuleName(), global.DisablePreoptModules) {
		return true
	}

	if d.isTest {
		return true
	}

	if !BoolDefault(d.dexpreoptProperties.Dex_preopt.Enabled, true) {
		return true
	}

	if !ctx.Module().(dexpreopterInterface).IsInstallable() {
		return true
	}

	if ctx.Host() {
		return true
	}

	// Don't preopt APEX variant module
	if apexInfo := ctx.Provider(android.ApexInfoProvider).(android.ApexInfo); !apexInfo.IsForPlatform() {
		return true
	}

	// TODO: contains no java code

	return false
}

func dexpreoptToolDepsMutator(ctx android.BottomUpMutatorContext) {
	if d, ok := ctx.Module().(dexpreopterInterface); !ok || d.dexpreoptDisabled(ctx) {
		return
	}
	dexpreopt.RegisterToolDeps(ctx)
}

func odexOnSystemOther(ctx android.ModuleContext, installPath android.InstallPath) bool {
	return dexpreopt.OdexOnSystemOtherByName(ctx.ModuleName(), android.InstallPathToOnDevicePath(ctx, installPath), dexpreopt.GetGlobalConfig(ctx))
}

func (d *dexpreopter) dexpreopt(ctx android.ModuleContext, dexJarFile android.WritablePath) {
	// TODO(b/148690468): The check on d.installPath is to bail out in cases where
	// the dexpreopter struct hasn't been fully initialized before we're called,
	// e.g. in aar.go. This keeps the behaviour that dexpreopting is effectively
	// disabled, even if installable is true.
	if d.installPath.Base() == "." {
		return
	}

	dexLocation := android.InstallPathToOnDevicePath(ctx, d.installPath)

	providesUsesLib := ctx.ModuleName()
	if ulib, ok := ctx.Module().(ProvidesUsesLib); ok {
		name := ulib.ProvidesUsesLib()
		if name != nil {
			providesUsesLib = *name
		}
	}

	if !d.isApp && !d.isTest {
		// Slim dexpreopt config is serialized to dexpreopt.config files and used by
		// dex_preopt_config_merger.py to get information about <uses-library> dependencies.
		// Note that it might be needed even if dexpreopt is disabled for this module.
		slimDexpreoptConfig := &dexpreopt.ModuleConfig{
			Name:                 ctx.ModuleName(),
			DexLocation:          dexLocation,
			EnforceUsesLibraries: d.enforceUsesLibs,
			ProvidesUsesLibrary:  providesUsesLib,
			ClassLoaderContexts:  d.classLoaderContexts,
			// The rest of the fields are not needed.
		}
		d.configPath = android.PathForModuleOut(ctx, "dexpreopt", "dexpreopt.config")
		dexpreopt.WriteSlimModuleConfigForMake(ctx, slimDexpreoptConfig, d.configPath)
	}

	if d.dexpreoptDisabled(ctx) {
		return
	}

	globalSoong := dexpreopt.GetGlobalSoongConfig(ctx)
	global := dexpreopt.GetGlobalConfig(ctx)

	isSystemServerJar := inList(ctx.ModuleName(), global.SystemServerJars)

	bootImage := defaultBootImageConfig(ctx)
	if global.UseArtImage {
		bootImage = artBootImageConfig(ctx)
	}

	// System server jars are an exception: they are dexpreopted without updatable bootclasspath.
	dexFiles, dexLocations := bcpForDexpreopt(ctx, global.PreoptWithUpdatableBcp && !isSystemServerJar)

	targets := ctx.MultiTargets()
	if len(targets) == 0 {
		// assume this is a java library, dexpreopt for all arches for now
		for _, target := range ctx.Config().Targets[android.Android] {
			if target.NativeBridge == android.NativeBridgeDisabled {
				targets = append(targets, target)
			}
		}
		if isSystemServerJar && !d.isSDKLibrary {
			// If the module is not an SDK library and it's a system server jar, only preopt the primary arch.
			targets = targets[:1]
		}
	}

	var archs []android.ArchType
	var images android.Paths
	var imagesDeps []android.OutputPaths
	for _, target := range targets {
		archs = append(archs, target.Arch.ArchType)
		variant := bootImage.getVariant(target)
		images = append(images, variant.images)
		imagesDeps = append(imagesDeps, variant.imagesDeps)
	}
	// The image locations for all Android variants are identical.
	imageLocations := bootImage.getAnyAndroidVariant().imageLocations()

	var profileClassListing android.OptionalPath
	var profileBootListing android.OptionalPath
	profileIsTextListing := false
	if BoolDefault(d.dexpreoptProperties.Dex_preopt.Profile_guided, true) {
		// If dex_preopt.profile_guided is not set, default it based on the existence of the
		// dexprepot.profile option or the profile class listing.
		if String(d.dexpreoptProperties.Dex_preopt.Profile) != "" {
			profileClassListing = android.OptionalPathForPath(
				android.PathForModuleSrc(ctx, String(d.dexpreoptProperties.Dex_preopt.Profile)))
			profileBootListing = android.ExistentPathForSource(ctx,
				ctx.ModuleDir(), String(d.dexpreoptProperties.Dex_preopt.Profile)+"-boot")
			profileIsTextListing = true
		} else if global.ProfileDir != "" {
			profileClassListing = android.ExistentPathForSource(ctx,
				global.ProfileDir, ctx.ModuleName()+".prof")
		}
	}

	// Full dexpreopt config, used to create dexpreopt build rules.
	dexpreoptConfig := &dexpreopt.ModuleConfig{
		Name:            ctx.ModuleName(),
		DexLocation:     dexLocation,
		BuildPath:       android.PathForModuleOut(ctx, "dexpreopt", ctx.ModuleName()+".jar").OutputPath,
		DexPath:         dexJarFile,
		ManifestPath:    d.manifestFile,
		UncompressedDex: d.uncompressedDex,
		HasApkLibraries: false,
		PreoptFlags:     nil,

		ProfileClassListing:  profileClassListing,
		ProfileIsTextListing: profileIsTextListing,
		ProfileBootListing:   profileBootListing,

		EnforceUsesLibrariesStatusFile: dexpreopt.UsesLibrariesStatusFile(ctx),
		EnforceUsesLibraries:           d.enforceUsesLibs,
		ProvidesUsesLibrary:            providesUsesLib,
		ClassLoaderContexts:            d.classLoaderContexts,

		Archs:                   archs,
		DexPreoptImages:         images,
		DexPreoptImagesDeps:     imagesDeps,
		DexPreoptImageLocations: imageLocations,

		PreoptBootClassPathDexFiles:     dexFiles.Paths(),
		PreoptBootClassPathDexLocations: dexLocations,

		PreoptExtractedApk: false,

		NoCreateAppImage:    !BoolDefault(d.dexpreoptProperties.Dex_preopt.App_image, true),
		ForceCreateAppImage: BoolDefault(d.dexpreoptProperties.Dex_preopt.App_image, false),

		PresignedPrebuilt: d.isPresignedPrebuilt,
	}

	dexpreoptRule, err := dexpreopt.GenerateDexpreoptRule(ctx, globalSoong, global, dexpreoptConfig)
	if err != nil {
		ctx.ModuleErrorf("error generating dexpreopt rule: %s", err.Error())
		return
	}

	dexpreoptRule.Build("dexpreopt", "dexpreopt")

	d.builtInstalled = dexpreoptRule.Installs().String()
}