// Copyright 2017 The etcd Authors
//
// 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.

// +build cov

package e2e

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"syscall"
	"time"

	"github.com/coreos/etcd/pkg/expect"
	"github.com/coreos/etcd/pkg/fileutil"
	"github.com/coreos/etcd/pkg/flags"
)

func spawnCmd(args []string) (*expect.ExpectProcess, error) {
	if args[0] == binPath {
		coverPath := os.Getenv("COVERDIR")
		if !filepath.IsAbs(coverPath) {
			// COVERDIR is relative to etcd root but e2e test has its path set to be relative to the e2e folder.
			// adding ".." in front of COVERDIR ensures that e2e saves coverage reports to the correct location.
			coverPath = filepath.Join("..", coverPath)
		}
		if !fileutil.Exist(coverPath) {
			return nil, fmt.Errorf("could not find coverage folder")
		}
		covArgs := []string{
			fmt.Sprintf("-test.coverprofile=e2e.%v.coverprofile", time.Now().UnixNano()),
			"-test.outputdir=" + coverPath,
		}
		ep := expect.NewExpectWithEnv(binDir+"/etcd_test", covArgs, args2env(args[1:]))
		// ep sends SIGTERM to etcd_test process on ep.close()
		// allowing the process to exit gracefully in order to generate a coverage report.
		// note: go runtime ignores SIGINT but not SIGTERM
		// if e2e test is run as a background process.
		ep.StopSignal = syscall.SIGTERM
		return nil, ep
	}
	return expect.NewExpect(args[0], args[1:]...)
}

func args2env(args []string) []string {
	var covEnvs []string
	for i := range args[1:] {
		if !strings.HasPrefix(args[i], "--") {
			continue
		}
		flag := strings.Split(args[i], "--")[1]
		val := "true"
		// split the flag that has "="
		// e.g --auto-tls=true" => flag=auto-tls and val=true
		if strings.Contains(args[i], "=") {
			split := strings.Split(flag, "=")
			flag = split[0]
			val = split[1]
		}

		if i+1 < len(args) {
			if !strings.HasPrefix(args[i+1], "--") {
				val = args[i+1]
			}
		}
		covEnvs = append(covEnvs, flags.FlagToEnv("ETCD", flag)+"="+val)
	}
	return covEnvs
}