package main

import (
	"io/ioutil"
	"log"
	"os"
	"strings"
	"time"
)

// LogFile contains the meta-data and entries
// of a lobgot3 file.
type LogFile struct {
	Path    string
	Channel string
	Time    time.Time
	Title   string
	Tag     string
	Entries []LogEntry
}

// LogEntry represents one line in a log-file
type LogEntry struct {
	Type string
	Time time.Time
	Nick string
	Text string
}

// NewLogFile creates a new logfile, but it doesn't
// load it.
func NewLogFile(path string) *LogFile {
	split := strings.Split(path, "/")
	name := strings.Replace(split[len(split)-1], ".txt", "", 1)
	tokens := strings.Split(name, "_")

	channel := tokens[len(tokens)-1]
	parsedTime, err := time.Parse("2006-01-02 150405", strings.Join(tokens[0:2], " ")[:17])

	if err != nil {
		log.Fatalf("Failed to parse filename %s:\n\t%s", path, err)
	}

	logFile := new(LogFile)
	logFile.Path = path
	logFile.Channel = channel
	logFile.Time = parsedTime

	return logFile
}

// Load loads the file and populates the remaining data
func (logFile *LogFile) Load() {
	file, err := os.Open(logFile.Path)
	if err != nil {
		log.Fatalf("Failed to open file %s:\n\t%s", logFile.Path, err)
	}

	data, err := ioutil.ReadAll(file)
	if err != nil || len(data) == 0 {
		log.Fatalf("Failed to read file %s:\n\t%s", logFile.Path, err)
	}

	rootDate := logFile.Time.Format("2006-01-02")
	lines := strings.Split(string(data), "\n")
	for _, line := range lines {
		split := strings.Split(line, " :")
		tokens := strings.Split(split[0], " ")
		text := ""

		if len(split) > 1 {
			text = split[1]
		}

		switch tokens[0] {
		case "ACTION", "TEXT":
			{
				parsedTime, _ := time.Parse("2006-01-02 15:04:05", rootDate+" "+tokens[2])
				entry := LogEntry{Nick: tokens[1], Text: text, Type: tokens[0], Time: parsedTime}

				// Handle midnights
				if entry.Time.Before(logFile.Time) {
					entry.Time = entry.Time.Add(time.Hour * 24)
				}

				logFile.Entries = append(logFile.Entries, entry)
			}
		case "TITLE":
			{
				logFile.Title = text
			}
		case "TAG":
			{
				logFile.Tag = text
			}
		}
	}
}