package process

import (
	"context"
	"fmt"
	"io"
	"os"
)

type Env map[string]string

func (env Env) ToSlice() []string {
	data := []string{}
	for key, value := range env {
		data = append(data, fmt.Sprintf("%s=%s", key, value))
	}
	return data
}

// Generic struct to start Process
type Exec struct {
	Arguments   []string // command and arguments
	Cwd         string   // Workdir path
	Environment Env      // Envs to add to process

	Context context.Context // Context to cancel process run

	Stdout, Stderr io.Writer // Stdout and Stderr log to attach process
	Stdin          io.Reader // Stdin reader
}

// Universal process struct
type Proc interface {
	Start(options *Exec) error // Start process in background
	Kill() error               // Kill process with SIGKILL
	Close() error              // Send ctrl + c (SIGINT) and wait process end
	Wait() error               // Wait process
	Signal(s os.Signal) error  // Send signal to process
	ExitCode() (int, error)    // return process exit code, if running wait to get exit code

	AttachStdin(io.Reader) error
	AttachStdout(io.Writer) error
	AttachStderr(io.Writer) error
}