// Copyright 2023, Command Line Inc.
// SPDX-License-Identifier: Apache-2.0

package shellutil

import (
	"os"
	"os/exec"
	"strings"

	"github.com/wavetermdev/waveterm/waveshell/pkg/base"
)

const DefaultTermType = "xterm-256color"
const DefaultTermRows = 24
const DefaultTermCols = 80

func MShellEnvVars(termType string) map[string]string {
	rtn := make(map[string]string)
	if termType != "" {
		rtn["TERM"] = termType
	}
	rtn["WAVESHELL"], _ = os.Executable()
	rtn["WAVESHELL_VERSION"] = base.MShellVersion
	return rtn
}

func UpdateCmdEnv(cmd *exec.Cmd, envVars map[string]string) {
	if len(envVars) == 0 {
		return
	}
	found := make(map[string]bool)
	var newEnv []string
	for _, envStr := range cmd.Env {
		envKey := GetEnvStrKey(envStr)
		newEnvVal, ok := envVars[envKey]
		if ok {
			if newEnvVal == "" {
				continue
			}
			newEnv = append(newEnv, envKey+"="+newEnvVal)
			found[envKey] = true
		} else {
			newEnv = append(newEnv, envStr)
		}
	}
	for envKey, envVal := range envVars {
		if found[envKey] {
			continue
		}
		newEnv = append(newEnv, envKey+"="+envVal)
	}
	cmd.Env = newEnv
}

func GetEnvStrKey(envStr string) string {
	eqIdx := strings.Index(envStr, "=")
	if eqIdx == -1 {
		return envStr
	}
	return envStr[0:eqIdx]
}