// Copyright 2019 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 sh

import (
	"fmt"
	"path/filepath"
	"strings"

	"github.com/google/blueprint/proptools"

	"android/soong/android"
)

// sh_binary is for shell scripts (and batch files) that are installed as
// executable files into .../bin/
//
// Do not use them for prebuilt C/C++/etc files.  Use cc_prebuilt_binary
// instead.

var pctx = android.NewPackageContext("android/soong/sh")

func init() {
	pctx.Import("android/soong/android")

	android.RegisterModuleType("sh_binary", ShBinaryFactory)
	android.RegisterModuleType("sh_binary_host", ShBinaryHostFactory)
	android.RegisterModuleType("sh_test", ShTestFactory)
	android.RegisterModuleType("sh_test_host", ShTestHostFactory)
}

type shBinaryProperties 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"`

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

	// install symlinks to the binary
	Symlinks []string `android:"arch_variant"`
}

type TestProperties struct {
	// list of compatibility suites (for example "cts", "vts") that the module should be
	// installed into.
	Test_suites []string `android:"arch_variant"`

	// the name of the test configuration (for example "AndroidTest.xml") that should be
	// installed with the module.
	Test_config *string `android:"arch_variant"`

	// list of files or filegroup modules that provide data that should be installed alongside
	// the test.
	Data []string `android:"path,arch_variant"`
}

type ShBinary struct {
	android.ModuleBase

	properties shBinaryProperties

	sourceFilePath android.Path
	outputFilePath android.OutputPath
	installedFile  android.InstallPath
}

var _ android.HostToolProvider = (*ShBinary)(nil)

type ShTest struct {
	ShBinary

	testProperties TestProperties

	data android.Paths
}

func (s *ShBinary) HostToolPath() android.OptionalPath {
	return android.OptionalPathForPath(s.installedFile)
}

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

func (s *ShBinary) OutputFile() android.OutputPath {
	return s.outputFilePath
}

func (s *ShBinary) SubDir() string {
	return proptools.String(s.properties.Sub_dir)
}

func (s *ShBinary) Installable() bool {
	return s.properties.Installable == nil || proptools.Bool(s.properties.Installable)
}

func (s *ShBinary) Symlinks() []string {
	return s.properties.Symlinks
}

func (s *ShBinary) generateAndroidBuildActions(ctx android.ModuleContext) {
	s.sourceFilePath = android.PathForModuleSrc(ctx, proptools.String(s.properties.Src))
	filename := proptools.String(s.properties.Filename)
	filename_from_src := proptools.Bool(s.properties.Filename_from_src)
	if filename == "" {
		if filename_from_src {
			filename = s.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
	}
	s.outputFilePath = android.PathForModuleOut(ctx, filename).OutputPath

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

func (s *ShBinary) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	s.generateAndroidBuildActions(ctx)
	installDir := android.PathForModuleInstall(ctx, "bin", proptools.String(s.properties.Sub_dir))
	s.installedFile = ctx.InstallExecutable(installDir, s.outputFilePath.Base(), s.outputFilePath)
}

func (s *ShBinary) AndroidMkEntries() []android.AndroidMkEntries {
	return []android.AndroidMkEntries{android.AndroidMkEntries{
		Class:      "EXECUTABLES",
		OutputFile: android.OptionalPathForPath(s.outputFilePath),
		Include:    "$(BUILD_SYSTEM)/soong_cc_prebuilt.mk",
		ExtraEntries: []android.AndroidMkExtraEntriesFunc{
			func(entries *android.AndroidMkEntries) {
				s.customAndroidMkEntries(entries)
			},
		},
	}}
}

func (s *ShBinary) customAndroidMkEntries(entries *android.AndroidMkEntries) {
	entries.SetString("LOCAL_MODULE_RELATIVE_PATH", proptools.String(s.properties.Sub_dir))
	entries.SetString("LOCAL_MODULE_SUFFIX", "")
	entries.SetString("LOCAL_MODULE_STEM", s.outputFilePath.Rel())
	if len(s.properties.Symlinks) > 0 {
		entries.SetString("LOCAL_MODULE_SYMLINKS", strings.Join(s.properties.Symlinks, " "))
	}
}

func (s *ShTest) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	s.ShBinary.generateAndroidBuildActions(ctx)
	testDir := "nativetest"
	if ctx.Target().Arch.ArchType.Multilib == "lib64" {
		testDir = "nativetest64"
	}
	if ctx.Target().NativeBridge == android.NativeBridgeEnabled {
		testDir = filepath.Join(testDir, ctx.Target().NativeBridgeRelativePath)
	} else if !ctx.Host() && ctx.Config().HasMultilibConflict(ctx.Arch().ArchType) {
		testDir = filepath.Join(testDir, ctx.Arch().ArchType.String())
	}
	installDir := android.PathForModuleInstall(ctx, testDir, proptools.String(s.properties.Sub_dir))
	s.installedFile = ctx.InstallExecutable(installDir, s.outputFilePath.Base(), s.outputFilePath)

	s.data = android.PathsForModuleSrc(ctx, s.testProperties.Data)
}

func (s *ShTest) InstallInData() bool {
	return true
}

func (s *ShTest) AndroidMkEntries() []android.AndroidMkEntries {
	return []android.AndroidMkEntries{android.AndroidMkEntries{
		Class:      "NATIVE_TESTS",
		OutputFile: android.OptionalPathForPath(s.outputFilePath),
		Include:    "$(BUILD_SYSTEM)/soong_cc_prebuilt.mk",
		ExtraEntries: []android.AndroidMkExtraEntriesFunc{
			func(entries *android.AndroidMkEntries) {
				s.customAndroidMkEntries(entries)

				entries.AddStrings("LOCAL_COMPATIBILITY_SUITE", s.testProperties.Test_suites...)
				entries.SetString("LOCAL_TEST_CONFIG", proptools.String(s.testProperties.Test_config))
				for _, d := range s.data {
					rel := d.Rel()
					path := d.String()
					if !strings.HasSuffix(path, rel) {
						panic(fmt.Errorf("path %q does not end with %q", path, rel))
					}
					path = strings.TrimSuffix(path, rel)
					entries.AddStrings("LOCAL_TEST_DATA", path+":"+rel)
				}
			},
		},
	}}
}

func InitShBinaryModule(s *ShBinary) {
	s.AddProperties(&s.properties)
}

// sh_binary is for a shell script or batch file to be installed as an
// executable binary to <partition>/bin.
func ShBinaryFactory() android.Module {
	module := &ShBinary{}
	module.Prefer32(func(ctx android.BaseModuleContext, base *android.ModuleBase, class android.OsClass) bool {
		return class == android.Device && ctx.Config().DevicePrefer32BitExecutables()
	})
	InitShBinaryModule(module)
	android.InitAndroidArchModule(module, android.HostAndDeviceSupported, android.MultilibFirst)
	return module
}

// sh_binary_host is for a shell script to be installed as an executable binary
// to $(HOST_OUT)/bin.
func ShBinaryHostFactory() android.Module {
	module := &ShBinary{}
	InitShBinaryModule(module)
	android.InitAndroidArchModule(module, android.HostSupported, android.MultilibFirst)
	return module
}

// sh_test defines a shell script based test module.
func ShTestFactory() android.Module {
	module := &ShTest{}
	InitShBinaryModule(&module.ShBinary)
	module.AddProperties(&module.testProperties)

	android.InitAndroidArchModule(module, android.HostAndDeviceSupported, android.MultilibFirst)
	return module
}

// sh_test_host defines a shell script based test module that runs on a host.
func ShTestHostFactory() android.Module {
	module := &ShTest{}
	InitShBinaryModule(&module.ShBinary)
	module.AddProperties(&module.testProperties)

	android.InitAndroidArchModule(module, android.HostSupported, android.MultilibFirst)
	return module
}