package main

import (
	"bufio"
	"errors"
	"fmt"
	"go-history"
	"os"
	"strings"
	"time"
)

var (
	emptyEntryError = errors.New("Empty Entry")
	parseError      = errors.New("Parse Error")
)

// 1969-12-31 19:00:00 ruby -rubygems -I./lib -r warbler/web_server -r warbler/local_web_server -S warble --trace
/*
 Wed Dec 31 19:00:00 -0500 EST 1969
 Wed Dec 31 19:00:00 -0500 EST 1969 rake doc
*/
func parseLine(line string) (history.Entry, error) {
	chunks := strings.SplitN(strings.Trim(line, " \n"), " ", 8)
	if len(chunks) == 7 {
		return history.Entry{}, emptyEntryError
	} else if len(chunks) == 8 {
		t, err := time.Parse("1969-01-02 19:00:00", strings.Join(chunks[0:1], " "))
		if err != nil {
			return history.Entry{}, err
		}
		return history.Entry{Time: t, Command: chunks[7]}, nil
	}
	return history.Entry{}, parseError
}

func parseCustomFile(filename string) (entries []history.Entry, err error) {
	file, err := os.Open(filename)
	if err != nil {
		return
	}

	buf_r := bufio.NewReader(file)
	for {
		line, err := buf_r.ReadString('\n')
		if err != nil {
			return entries, err
		}
		entry, err := parseLine(line)
		if err == emptyEntryError {
			continue
		} else if err != nil {
			return entries, err
		}
		entries = append(entries, entry)
	}
	return
}

func main() {
	fmt.Println(parseCustomFile(os.Args[1]))
	return

	for _, arg := range os.Args[1:] {
		entries, err := history.ParseBashHistory(arg)
		if err != nil {
			fmt.Println(err)
		}
		for i := range entries {
			fmt.Printf("%#v\n", entries[i])
		}
	}

}