// 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 cc

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

	"android/soong/common"
)

func init() {
	common.RegisterMakeVarsProvider(pctx, makeVarsProvider)
}

func makeVarsProvider(ctx common.MakeVarsContext) {
	ctx.Strict("LLVM_PREBUILTS_VERSION", "${clangVersion}")
	ctx.Strict("LLVM_PREBUILTS_BASE", "${clangBase}")

	hostType := common.CurrentHostType()
	arches := ctx.Config().HostArches[hostType]
	makeVarsToolchain(ctx, "", common.Host, hostType, arches[0])
	if len(arches) > 1 {
		makeVarsToolchain(ctx, "2ND_", common.Host, hostType, arches[1])
	}

	if winArches, ok := ctx.Config().HostArches[common.Windows]; ok {
		makeVarsToolchain(ctx, "", common.Host, common.Windows, winArches[0])
		if len(winArches) > 1 {
			makeVarsToolchain(ctx, "2ND_", common.Host, common.Windows, winArches[1])
		}
	}

	arches = ctx.Config().DeviceArches
	makeVarsToolchain(ctx, "", common.Device, common.NoHostType, arches[0])
	if len(arches) > 1 {
		makeVarsToolchain(ctx, "2ND_", common.Device, common.NoHostType, arches[1])
	}
}

func makeVarsToolchain(ctx common.MakeVarsContext, secondPrefix string,
	hod common.HostOrDevice, ht common.HostType, arch common.Arch) {
	var typePrefix string
	if hod.Host() {
		if ht == common.Windows {
			typePrefix = "HOST_CROSS_"
		} else {
			typePrefix = "HOST_"
		}
	} else {
		typePrefix = "TARGET_"
	}
	makePrefix := secondPrefix + typePrefix

	toolchain := toolchainFactories[hod][ht][arch.ArchType](arch)

	globalCflags := fmt.Sprintf("${commonGlobalCflags} ${%sGlobalCflags}", hod)

	ctx.CheckSorted(makePrefix+"GLOBAL_CFLAGS", strings.Join([]string{
		toolchain.ToolchainCflags(),
		globalCflags,
		toolchain.Cflags(),
	}, " "))
	ctx.CheckSorted(makePrefix+"GLOBAL_LDFLAGS", strings.Join([]string{
		toolchain.ToolchainLdflags(),
		toolchain.Ldflags(),
	}, " "))

	if toolchain.ClangSupported() {
		clangPrefix := secondPrefix + "CLANG_" + typePrefix
		clangExtras := "-target " + toolchain.ClangTriple() + " -B" + filepath.Join(toolchain.GccRoot(), toolchain.GccTriple(), "bin")

		globalClangCflags := fmt.Sprintf("${commonClangGlobalCflags} ${clangExtraCflags} ${%sClangGlobalCflags}", hod)

		ctx.CheckSorted(clangPrefix+"GLOBAL_CFLAGS", strings.Join([]string{
			toolchain.ToolchainClangCflags(),
			globalClangCflags,
			toolchain.ClangCflags(),
			clangExtras,
		}, " "))
		ctx.CheckSorted(clangPrefix+"GLOBAL_LDFLAGS", strings.Join([]string{
			toolchain.ToolchainClangLdflags(),
			toolchain.ClangLdflags(),
			clangExtras,
		}, " "))
	}

	ctx.Strict(makePrefix+"CC", gccCmd(toolchain, "gcc"))
	ctx.Strict(makePrefix+"CXX", gccCmd(toolchain, "g++"))

	if ht == common.Darwin {
		ctx.Strict(makePrefix+"AR", "${macArPath}")
	} else {
		ctx.Strict(makePrefix+"AR", gccCmd(toolchain, "ar"))
		ctx.Strict(makePrefix+"READELF", gccCmd(toolchain, "readelf"))
		ctx.Strict(makePrefix+"NM", gccCmd(toolchain, "nm"))
	}
}