// Copyright 2016 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 android

import "strconv"

// TODO(jungw): Now that it handles more than the ones in etc/, consider renaming this file.

func init() {
	RegisterModuleType("prebuilt_etc", PrebuiltEtcFactory)
	RegisterModuleType("prebuilt_etc_host", PrebuiltEtcHostFactory)
	RegisterModuleType("prebuilt_usr_share", PrebuiltUserShareFactory)
	RegisterModuleType("prebuilt_usr_share_host", PrebuiltUserShareHostFactory)
	RegisterModuleType("prebuilt_font", PrebuiltFontFactory)
	RegisterModuleType("prebuilt_firmware", PrebuiltFirmwareFactory)

	PreDepsMutators(func(ctx RegisterMutatorsContext) {
		ctx.BottomUp("prebuilt_etc", prebuiltEtcMutator).Parallel()
	})
}

type prebuiltEtcProperties struct {
	// Source file of this prebuilt.
	Src *string `android:"path,arch_variant"`

	// optional subdirectory under which this file is installed into
	Sub_dir *string `android:"arch_variant"`

	// optional name for the installed file. If unspecified, name of the module is used as the file name
	Filename *string `android:"arch_variant"`

	// when set to true, and filename property is not set, the name for the installed file
	// is the same as the file name of the source file.
	Filename_from_src *bool `android:"arch_variant"`

	// Make this module available when building for recovery.
	Recovery_available *bool

	InRecovery bool `blueprint:"mutated"`

	// Whether this module is directly installable to one of the partitions. Default: true.
	Installable *bool
}

type PrebuiltEtc struct {
	ModuleBase

	properties prebuiltEtcProperties

	sourceFilePath Path
	outputFilePath OutputPath
	// The base install location, e.g. "etc" for prebuilt_etc, "usr/share" for prebuilt_usr_share.
	installDirBase string
	// The base install location when soc_specific property is set to true, e.g. "firmware" for prebuilt_firmware.
	socInstallDirBase      string
	installDirPath         InstallPath
	additionalDependencies *Paths
}

func (p *PrebuiltEtc) inRecovery() bool {
	return p.properties.InRecovery || p.ModuleBase.InstallInRecovery()
}

func (p *PrebuiltEtc) onlyInRecovery() bool {
	return p.ModuleBase.InstallInRecovery()
}

func (p *PrebuiltEtc) InstallInRecovery() bool {
	return p.inRecovery()
}

func (p *PrebuiltEtc) DepsMutator(ctx BottomUpMutatorContext) {
	if p.properties.Src == nil {
		ctx.PropertyErrorf("src", "missing prebuilt source file")
	}
}

func (p *PrebuiltEtc) SourceFilePath(ctx ModuleContext) Path {
	return PathForModuleSrc(ctx, String(p.properties.Src))
}

func (p *PrebuiltEtc) InstallDirPath() InstallPath {
	return p.installDirPath
}

// This allows other derivative modules (e.g. prebuilt_etc_xml) to perform
// additional steps (like validating the src) before the file is installed.
func (p *PrebuiltEtc) SetAdditionalDependencies(paths Paths) {
	p.additionalDependencies = &paths
}

func (p *PrebuiltEtc) OutputFile() OutputPath {
	return p.outputFilePath
}

func (p *PrebuiltEtc) SubDir() string {
	return String(p.properties.Sub_dir)
}

func (p *PrebuiltEtc) Installable() bool {
	return p.properties.Installable == nil || Bool(p.properties.Installable)
}

func (p *PrebuiltEtc) GenerateAndroidBuildActions(ctx ModuleContext) {
	p.sourceFilePath = PathForModuleSrc(ctx, String(p.properties.Src))
	filename := String(p.properties.Filename)
	filename_from_src := Bool(p.properties.Filename_from_src)
	if filename == "" {
		if filename_from_src {
			filename = p.sourceFilePath.Base()
		} else {
			filename = ctx.ModuleName()
		}
	} else if filename_from_src {
		ctx.PropertyErrorf("filename_from_src", "filename is set. filename_from_src can't be true")
		return
	}
	p.outputFilePath = PathForModuleOut(ctx, filename).OutputPath

	// If soc install dir was specified and SOC specific is set, set the installDirPath to the specified
	// socInstallDirBase.
	installBaseDir := p.installDirBase
	if ctx.SocSpecific() && p.socInstallDirBase != "" {
		installBaseDir = p.socInstallDirBase
	}
	p.installDirPath = PathForModuleInstall(ctx, installBaseDir, String(p.properties.Sub_dir))

	// This ensures that outputFilePath has the correct name for others to
	// use, as the source file may have a different name.
	ctx.Build(pctx, BuildParams{
		Rule:   Cp,
		Output: p.outputFilePath,
		Input:  p.sourceFilePath,
	})
}

func (p *PrebuiltEtc) AndroidMkEntries() AndroidMkEntries {
	nameSuffix := ""
	if p.inRecovery() && !p.onlyInRecovery() {
		nameSuffix = ".recovery"
	}
	return AndroidMkEntries{
		Class:      "ETC",
		SubName:    nameSuffix,
		OutputFile: OptionalPathForPath(p.outputFilePath),
		ExtraEntries: []AndroidMkExtraEntriesFunc{
			func(entries *AndroidMkEntries) {
				entries.SetString("LOCAL_MODULE_TAGS", "optional")
				entries.SetString("LOCAL_MODULE_PATH", p.installDirPath.ToMakePath().String())
				entries.SetString("LOCAL_INSTALLED_MODULE_STEM", p.outputFilePath.Base())
				entries.SetString("LOCAL_UNINSTALLABLE_MODULE", strconv.FormatBool(!p.Installable()))
				if p.additionalDependencies != nil {
					for _, path := range *p.additionalDependencies {
						entries.SetString("LOCAL_ADDITIONAL_DEPENDENCIES", path.String())
					}
				}
			},
		},
	}
}

func InitPrebuiltEtcModule(p *PrebuiltEtc, dirBase string) {
	p.installDirBase = dirBase
	p.AddProperties(&p.properties)
}

// prebuilt_etc is for a prebuilt artifact that is installed in
// <partition>/etc/<sub_dir> directory.
func PrebuiltEtcFactory() Module {
	module := &PrebuiltEtc{}
	InitPrebuiltEtcModule(module, "etc")
	// This module is device-only
	InitAndroidArchModule(module, DeviceSupported, MultilibFirst)
	return module
}

// prebuilt_etc_host is for a host prebuilt artifact that is installed in
// $(HOST_OUT)/etc/<sub_dir> directory.
func PrebuiltEtcHostFactory() Module {
	module := &PrebuiltEtc{}
	InitPrebuiltEtcModule(module, "etc")
	// This module is host-only
	InitAndroidArchModule(module, HostSupported, MultilibCommon)
	return module
}

// prebuilt_usr_share is for a prebuilt artifact that is installed in
// <partition>/usr/share/<sub_dir> directory.
func PrebuiltUserShareFactory() Module {
	module := &PrebuiltEtc{}
	InitPrebuiltEtcModule(module, "usr/share")
	// This module is device-only
	InitAndroidArchModule(module, DeviceSupported, MultilibFirst)
	return module
}

// prebuild_usr_share_host is for a host prebuilt artifact that is installed in
// $(HOST_OUT)/usr/share/<sub_dir> directory.
func PrebuiltUserShareHostFactory() Module {
	module := &PrebuiltEtc{}
	InitPrebuiltEtcModule(module, "usr/share")
	// This module is host-only
	InitAndroidArchModule(module, HostSupported, MultilibCommon)
	return module
}

const (
	// coreMode is the variant for modules to be installed to system.
	coreMode = "core"

	// recoveryMode means a module to be installed to recovery image.
	recoveryMode = "recovery"
)

// prebuiltEtcMutator creates the needed variants to install the module to
// system or recovery.
func prebuiltEtcMutator(mctx BottomUpMutatorContext) {
	m, ok := mctx.Module().(*PrebuiltEtc)
	if !ok || m.Host() {
		return
	}

	var coreVariantNeeded bool = true
	var recoveryVariantNeeded bool = false
	if Bool(m.properties.Recovery_available) {
		recoveryVariantNeeded = true
	}

	if m.ModuleBase.InstallInRecovery() {
		recoveryVariantNeeded = true
		coreVariantNeeded = false
	}

	var variants []string
	if coreVariantNeeded {
		variants = append(variants, coreMode)
	}
	if recoveryVariantNeeded {
		variants = append(variants, recoveryMode)
	}
	mod := mctx.CreateVariations(variants...)
	for i, v := range variants {
		if v == recoveryMode {
			m := mod[i].(*PrebuiltEtc)
			m.properties.InRecovery = true
		}
	}
}

// prebuilt_font installs a font in <partition>/fonts directory.
func PrebuiltFontFactory() Module {
	module := &PrebuiltEtc{}
	InitPrebuiltEtcModule(module, "fonts")
	// This module is device-only
	InitAndroidArchModule(module, DeviceSupported, MultilibFirst)
	return module
}

// prebuilt_firmware installs a firmware file to <partition>/etc/firmware directory for system image.
// If soc_specific property is set to true, the firmware file is installed to the vendor <partition>/firmware
// directory for vendor image.
func PrebuiltFirmwareFactory() Module {
	module := &PrebuiltEtc{}
	module.socInstallDirBase = "firmware"
	InitPrebuiltEtcModule(module, "etc/firmware")
	// This module is device-only
	InitAndroidArchModule(module, DeviceSupported, MultilibFirst)
	return module
}