// Copyright 2019 The Android Open Source Project
//
// 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 rust

import (
	"path/filepath"

	"github.com/google/blueprint/proptools"

	"android/soong/android"
	"android/soong/cc"
	"android/soong/tradefed"
)

type TestProperties struct {
	// Disables the creation of a test-specific directory when used with
	// relative_install_path. Useful if several tests need to be in the same
	// directory.
	No_named_install_directory *bool

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

	// the name of the test configuration template (for example "AndroidTestTemplate.xml") that
	// should be installed with the module.
	Test_config_template *string `android:"path,arch_variant"`

	// list of compatibility suites (for example "cts", "vts") that the module should be
	// installed into.
	Test_suites []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"`

	// list of shared library modules that should be installed alongside the test
	Data_libs []string `android:"arch_variant"`

	// list of binary modules that should be installed alongside the test
	Data_bins []string `android:"arch_variant"`

	// Flag to indicate whether or not to create test config automatically. If AndroidTest.xml
	// doesn't exist next to the Android.bp, this attribute doesn't need to be set to true
	// explicitly.
	Auto_gen_config *bool

	// if set, build with the standard Rust test harness. Defaults to true.
	Test_harness *bool

	// Test options.
	Test_options android.CommonTestOptions

	// Add RootTargetPreparer to auto generated test config. This guarantees the test to run
	// with root permission.
	Require_root *bool
}

// A test module is a binary module with extra --test compiler flag
// and different default installation directory.
// In golang, inheriance is written as a component.
type testDecorator struct {
	*binaryDecorator
	Properties TestProperties
	testConfig android.Path

	data []android.DataPath
}

func (test *testDecorator) dataPaths() []android.DataPath {
	return test.data
}

func (test *testDecorator) nativeCoverage() bool {
	return true
}

func (test *testDecorator) testHarness() bool {
	return BoolDefault(test.Properties.Test_harness, true)
}

func NewRustTest(hod android.HostOrDeviceSupported) (*Module, *testDecorator) {
	// Build both 32 and 64 targets for device tests.
	// Cannot build both for host tests yet if the test depends on
	// something like proc-macro2 that cannot be built for both.
	multilib := android.MultilibBoth
	if hod != android.DeviceSupported && hod != android.HostAndDeviceSupported {
		multilib = android.MultilibFirst
	}
	module := newModule(hod, multilib)

	test := &testDecorator{
		binaryDecorator: &binaryDecorator{
			baseCompiler: NewBaseCompiler("nativetest", "nativetest64", InstallInData),
		},
	}

	module.compiler = test
	return module, test
}

func (test *testDecorator) compilerProps() []interface{} {
	return append(test.binaryDecorator.compilerProps(), &test.Properties)
}

func (test *testDecorator) install(ctx ModuleContext) {
	// TODO: (b/167308193) Switch to /data/local/tests/unrestricted as the default install base.
	testInstallBase := "/data/local/tmp"
	if ctx.RustModule().InVendorOrProduct() {
		testInstallBase = "/data/local/tests/vendor"
	}

	var configs []tradefed.Config
	if Bool(test.Properties.Require_root) {
		configs = append(configs, tradefed.Object{"target_preparer", "com.android.tradefed.targetprep.RootTargetPreparer", nil})
	} else {
		var options []tradefed.Option
		options = append(options, tradefed.Option{Name: "force-root", Value: "false"})
		configs = append(configs, tradefed.Object{"target_preparer", "com.android.tradefed.targetprep.RootTargetPreparer", options})
	}

	test.testConfig = tradefed.AutoGenTestConfig(ctx, tradefed.AutoGenTestConfigOptions{
		TestConfigProp:         test.Properties.Test_config,
		TestConfigTemplateProp: test.Properties.Test_config_template,
		TestSuites:             test.Properties.Test_suites,
		Config:                 configs,
		AutoGenConfig:          test.Properties.Auto_gen_config,
		TestInstallBase:        testInstallBase,
		DeviceTemplate:         "${RustDeviceTestConfigTemplate}",
		HostTemplate:           "${RustHostTestConfigTemplate}",
	})

	dataSrcPaths := android.PathsForModuleSrc(ctx, test.Properties.Data)

	ctx.VisitDirectDepsWithTag(dataLibDepTag, func(dep android.Module) {
		depName := ctx.OtherModuleName(dep)
		linkableDep, ok := dep.(cc.LinkableInterface)
		if !ok {
			ctx.ModuleErrorf("data_lib %q is not a linkable module", depName)
		}
		if linkableDep.OutputFile().Valid() {
			// Copy the output in "lib[64]" so that it's compatible with
			// the default rpath values.
			libDir := "lib"
			if linkableDep.Target().Arch.ArchType.Multilib == "lib64" {
				libDir = "lib64"
			}
			test.data = append(test.data,
				android.DataPath{SrcPath: linkableDep.OutputFile().Path(),
					RelativeInstallPath: filepath.Join(libDir, linkableDep.RelativeInstallPath())})
		}
	})

	ctx.VisitDirectDepsWithTag(dataBinDepTag, func(dep android.Module) {
		depName := ctx.OtherModuleName(dep)
		linkableDep, ok := dep.(cc.LinkableInterface)
		if !ok {
			ctx.ModuleErrorf("data_bin %q is not a linkable module", depName)
		}
		if linkableDep.OutputFile().Valid() {
			test.data = append(test.data,
				android.DataPath{SrcPath: linkableDep.OutputFile().Path(),
					RelativeInstallPath: linkableDep.RelativeInstallPath()})
		}
	})

	for _, dataSrcPath := range dataSrcPaths {
		test.data = append(test.data, android.DataPath{SrcPath: dataSrcPath})
	}

	// default relative install path is module name
	if !Bool(test.Properties.No_named_install_directory) {
		test.baseCompiler.relative = ctx.ModuleName()
	} else if String(test.baseCompiler.Properties.Relative_install_path) == "" {
		ctx.PropertyErrorf("no_named_install_directory", "Module install directory may only be disabled if relative_install_path is set")
	}

	if ctx.Host() && test.Properties.Test_options.Unit_test == nil {
		test.Properties.Test_options.Unit_test = proptools.BoolPtr(true)
	}
	test.binaryDecorator.installTestData(ctx, test.data)
	test.binaryDecorator.install(ctx)
}

func (test *testDecorator) compilerFlags(ctx ModuleContext, flags Flags) Flags {
	flags = test.binaryDecorator.compilerFlags(ctx, flags)
	if test.testHarness() {
		flags.RustFlags = append(flags.RustFlags, "--test")
	}
	if ctx.Device() {
		flags.RustFlags = append(flags.RustFlags, "-Z panic_abort_tests")
	}

	return flags
}

func (test *testDecorator) autoDep(ctx android.BottomUpMutatorContext) autoDep {
	return rlibAutoDep
}

func init() {
	// Rust tests are binary files built with --test.
	android.RegisterModuleType("rust_test", RustTestFactory)
	android.RegisterModuleType("rust_test_host", RustTestHostFactory)
}

func RustTestFactory() android.Module {
	module, _ := NewRustTest(android.HostAndDeviceSupported)

	// NewRustTest will set MultilibBoth true, however the host variant
	// cannot produce the non-primary target. Therefore, add the
	// rustTestHostMultilib load hook to set MultilibFirst for the
	// host target.
	android.AddLoadHook(module, rustTestHostMultilib)
	module.testModule = true
	return module.Init()
}

func RustTestHostFactory() android.Module {
	module, _ := NewRustTest(android.HostSupported)
	module.testModule = true
	return module.Init()
}

func (test *testDecorator) stdLinkage(ctx *depsContext) RustLinkage {
	return RlibLinkage
}

func (test *testDecorator) compilerDeps(ctx DepsContext, deps Deps) Deps {
	deps = test.binaryDecorator.compilerDeps(ctx, deps)

	deps.Rustlibs = append(deps.Rustlibs, "libtest")

	deps.DataLibs = append(deps.DataLibs, test.Properties.Data_libs...)
	deps.DataBins = append(deps.DataBins, test.Properties.Data_bins...)

	return deps
}

func (test *testDecorator) testBinary() bool {
	return true
}

func rustTestHostMultilib(ctx android.LoadHookContext) {
	type props struct {
		Target struct {
			Host struct {
				Compile_multilib *string
			}
		}
	}
	p := &props{}
	p.Target.Host.Compile_multilib = proptools.StringPtr("first")
	ctx.AppendProperties(p)
}