package main

import (
	"bufio"
	"flag"
	"fmt"
	"os"
	"os/exec"
)

import (
	"mailq-inspector/parser"
)

var settings = make(map[string]string)

func argParse() {
	inputModePtr := flag.String("inputMode", "stdin", "How to get mailq output. Available options: \"stdin\", 'cmd'")
	flag.Parse()
	settings["inputMode"] = *inputModePtr
}

func main() {
	argParse()
	var entries []parser.QEntry
	var err error
	if settings["inputMode"] == "stdin" {
		entries, err = readFromStdin()
	} else if settings["inputMode"] == "cmd" {
		entries, err = readFromCmd(exec.Command("mailq"))
	} else {
		fmt.Printf("Unsupported inputMode!")
		flag.PrintDefaults()
		os.Exit(1)
	}

	if err != nil {
		fmt.Printf("Error reading: %s\n", err.Error())
		os.Exit(1)
	}

	for _, line := range entries {
		fmt.Printf("Read: %s", line)
	}
}

func readFromStdin() ([]parser.QEntry, error) {
	scanner := bufio.NewScanner(os.Stdin)
	return parser.ParseMailQ(scanner)
}

func readFromCmd(cmd *exec.Cmd) ([]parser.QEntry, error) {
	stdout, err := cmd.StdoutPipe()
	err = cmd.Start()
	scanner := bufio.NewScanner(stdout)
	result, resErr := parser.ParseMailQ(scanner)
	err = cmd.Wait()
	if err != nil {
		fmt.Printf("Oh no: %s", err.Error())
	}
	return result, resErr
}