// 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 (
	"fmt"
	"io"
	"strings"
)

// 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)

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

type prebuiltEtcProperties struct {
	// Source file of this prebuilt.
	Src *string `android:"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
	installDirPath         OutputPath
	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")
	}

	// To support ":modulename" in src
	ExtractSourceDeps(ctx, p.properties.Src)
}

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

// 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 = ctx.ExpandSource(String(p.properties.Src), "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
	p.installDirPath = PathForModuleInstall(ctx, p.installDirBase, 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) AndroidMk() AndroidMkData {
	return AndroidMkData{
		Custom: func(w io.Writer, name, prefix, moduleDir string, data AndroidMkData) {
			nameSuffix := ""
			if p.inRecovery() && !p.onlyInRecovery() {
				nameSuffix = ".recovery"
			}
			fmt.Fprintln(w, "\ninclude $(CLEAR_VARS)")
			fmt.Fprintln(w, "LOCAL_PATH :=", moduleDir)
			fmt.Fprintln(w, "LOCAL_MODULE :=", name+nameSuffix)
			fmt.Fprintln(w, "LOCAL_MODULE_CLASS := ETC")
			if p.commonProperties.Owner != nil {
				fmt.Fprintln(w, "LOCAL_MODULE_OWNER :=", *p.commonProperties.Owner)
			}
			fmt.Fprintln(w, "LOCAL_MODULE_TAGS := optional")
			if p.Host() {
				fmt.Fprintln(w, "LOCAL_IS_HOST_MODULE := true")
			}
			fmt.Fprintln(w, "LOCAL_PREBUILT_MODULE_FILE :=", p.outputFilePath.String())
			fmt.Fprintln(w, "LOCAL_MODULE_PATH :=", "$(OUT_DIR)/"+p.installDirPath.RelPathString())
			fmt.Fprintln(w, "LOCAL_INSTALLED_MODULE_STEM :=", p.outputFilePath.Base())
			fmt.Fprintln(w, "LOCAL_UNINSTALLABLE_MODULE :=", !p.Installable())
			fmt.Fprintln(w, "LOCAL_REQUIRED_MODULES :=", strings.Join(data.Required, " "))
			if p.additionalDependencies != nil {
				fmt.Fprint(w, "LOCAL_ADDITIONAL_DEPENDENCIES :=")
				for _, path := range *p.additionalDependencies {
					fmt.Fprint(w, " "+path.String())
				}
				fmt.Fprintln(w, "")
			}
			fmt.Fprintln(w, "include $(BUILD_PREBUILT)")
		},
	}
}

func InitPrebuiltEtcModule(p *PrebuiltEtc) {
	p.AddProperties(&p.properties)
}

// prebuilt_etc is for prebuilts that will be installed to <partition>/etc/<subdir>
func PrebuiltEtcFactory() Module {
	module := &PrebuiltEtc{installDirBase: "etc"}
	InitPrebuiltEtcModule(module)
	// This module is device-only
	InitAndroidArchModule(module, DeviceSupported, MultilibFirst)
	return module
}

func PrebuiltEtcHostFactory() Module {
	module := &PrebuiltEtc{installDirBase: "etc"}
	InitPrebuiltEtcModule(module)
	// This module is host-only
	InitAndroidArchModule(module, HostSupported, MultilibCommon)
	return module
}

// prebuilt_usr_share is for prebuilts that will be installed to <partition>/usr/share/<subdir>
func PrebuiltUserShareFactory() Module {
	module := &PrebuiltEtc{installDirBase: "usr/share"}
	InitPrebuiltEtcModule(module)
	// This module is device-only
	InitAndroidArchModule(module, DeviceSupported, MultilibFirst)
	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
		}
	}
}