package main

import (
	"bufio"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"os/exec"
	"strings"

	"github.com/gabriel-vasile/mimetype"
)

func main() {
	if len(os.Args) != 2 {
		log.Fatal("'open' get's exactly one argument")
	}

	file := os.Args[1]
	home := os.Getenv("HOME")

	var prog string

	mtype, err := mimetype.DetectFile(file)
	if err != nil {
		log.Fatalf("%v", err)
	}
	dirpath := home + "/.open/"
	os.MkdirAll(dirpath, 0775)
	opener_file := dirpath + mtype.Extension()

	if _, err := os.Stat(opener_file); err == nil {
		content, err := ioutil.ReadFile(opener_file)
		if err != nil {
			log.Fatalf("%v", err)
		}
		prog = string(content)
	} else {
		fmt.Printf("Don't know how to open '%s' file. What program should I use? ", mtype.Extension())
		reader := bufio.NewReader(os.Stdin)
		prog_string, err := reader.ReadString('\n')
		if err != nil {
			log.Fatal(err)
		}
		prog_string = string(prog_string[0 : len(prog_string)-1])
		prog = strings.Clone(prog_string)
		s := []byte(prog_string)
		err = ioutil.WriteFile(opener_file, s, 0644)
		if err != nil {
			log.Fatal(err)
		}

	}

	command := strings.Split(prog, " ")
	out, err := exec.Command(command[0], command[1:]...).Output()
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(string(out))

}