package main

import (
	"bufio"
	"fmt"
	"os"
	"os/signal"
	"strings"

	"gosh/cmds"
	"gosh/global"
)

// TODO: iterate through args ahead of time to make things run better
func main() {
	r := bufio.NewReader(os.Stdin)
	ch := make(chan os.Signal, 1)

	go func() {
		signal.Notify(ch)
		signal.Ignore(<-ch)
	}()

	for {
		d, _ := os.Getwd()
		fmt.Printf("gosh-0.1:%s$ ", abbr(d))
		cmd, err := r.ReadString('\n')
		if err != nil && err.Error() == "EOF" {
			fmt.Println()
			continue
		}

		cmd = strings.TrimSuffix(cmd, "\n")
		args := strings.Split(cmd, " ")
		switch args[0] {
		case "cd":
			if global.ReturnCode, err = cmds.ChDir(args); err != nil {
				fmt.Fprintln(os.Stderr, err.Error())
			}
			break
		case "export":
			if global.ReturnCode, err = cmds.Export(args); err != nil {
				fmt.Fprintln(os.Stderr, err.Error())
			}
			break
		case "unset":
			if global.ReturnCode, err = cmds.Unset(args); err != nil {
				fmt.Fprintln(os.Stderr, err.Error())
			}
			break
		case "set":
			if len(args) == 1 {
				cmds.PrintEnv()
			} else {
				cmds.Set(args)
			}
			break
		case "test", "[":
			if global.ReturnCode, err = cmds.Test(args); err != nil {
				fmt.Fprintln(os.Stderr, err.Error())
			}
			break
		case "trap":
			if global.ReturnCode, err = cmds.Trap(args); err != nil {
				fmt.Fprintln(os.Stderr, err.Error())
			}
			break
		case ":":
			global.ReturnCode = 0
			err = nil
			break
		case "exit":
			if err = cmds.Exit(args); err != nil {
				fmt.Fprintln(os.Stderr, err.Error())
			}
			break
		default:
			global.ReturnCode = cmds.External(args)
			break
		}
	}
}

func abbr(dir string) string {
	home, _ := os.UserHomeDir()
	if dir == home {
		return "~"
	}
	dirs := strings.Split(dir, "/")
	return dirs[len(dirs)-1]
}