package main

import (
	"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'")
	mailqCommandPtr := flag.String("mailqCommand", "mailq", "Command to use for getting mailq output")
	mailqCommandArgsPtr := flag.String("mailqCommandArgs", "", "Optional arguments to pass to mailqCommand")
	flag.Parse()
	settings["inputMode"] = *inputModePtr
    settings["mailqCommand"] = *mailqCommandPtr
    settings["mailqCommandArgs"] = *mailqCommandArgsPtr
}

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(settings["mailqCommand"]))
	} 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) {
	return parser.ParseMailQ(os.Stdin)
}

func readFromCmd(cmd *exec.Cmd) ([]parser.QEntry, error) {
	stdout, err := cmd.StdoutPipe()
    if err != nil {
        return nil, err
    }
	if err := cmd.Start(); err != nil {
        return nil, err
    }
	result, resultError := parser.ParseMailQ(stdout)
	if err := cmd.Wait(); err != nil {
        return nil, err
	}
	return result, resultError
}