// 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 phony

import (
	"fmt"
	"io"
	"strings"

	"github.com/google/blueprint"

	"android/soong/android"
)

func init() {
	android.RegisterModuleType("phony", phonyFactory)
}

type phony struct {
	android.ModuleBase
	requiredModuleNames []string
}

func phonyFactory() (blueprint.Module, []interface{}) {
	module := &phony{}

	return android.InitAndroidModule(module)
}

func (p *phony) DepsMutator(ctx android.BottomUpMutatorContext) {
}

func (p *phony) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	p.requiredModuleNames = ctx.RequiredModuleNames()
	if len(p.requiredModuleNames) == 0 {
		ctx.PropertyErrorf("required", "phony must not have empty required dependencies in order to be useful(and therefore permitted).")
	}
}

func (p *phony) AndroidMk() (ret android.AndroidMkData, err error) {
	ret.Custom = func(w io.Writer, name, prefix, moduleDir string) error {
		fmt.Fprintln(w, "\ninclude $(CLEAR_VARS)")
		fmt.Fprintln(w, "LOCAL_PATH :=", moduleDir)
		fmt.Fprintln(w, "LOCAL_MODULE :=", name)
		fmt.Fprintln(w, "LOCAL_REQUIRED_MODULES := "+strings.Join(p.requiredModuleNames, " "))
		fmt.Fprintln(w, "include $(BUILD_PHONY_PACKAGE)")

		return nil
	}
	return
}