package main

import (
	"log"
	"os"
	"regexp"
	"strconv"
	"strings"
)

var timeUnits = map[string]int64{
	"ms": 1,
	"s":  1000,
	"m":  1000 * 60,
	"h":  1000 * 60 * 60,
	"d":  1000 * 60 * 60 * 24,
	"M":  1000 * 60 * 60 * 24 * 30,
	"y":  1000 * 60 * 60 * 24 * 365,
}

var valueRegex, _ = regexp.Compile(`\d+`)
var unitRegex, _ = regexp.Compile(`[a-zA-Z]+`)

func parseDuration(date string) int64 {
	var milliseconds int64 = 0

	date = strings.TrimSpace(date)
	var parts = strings.Split(date, "_")
	for _, part := range parts {
		part = strings.TrimSpace(part)
		log.Printf("Parsing date part: %s\n", part)
		var value = valueRegex.FindString(part)
		var unit = unitRegex.FindString(part)

		if value == "" || unit == "" {
			log.Println("Invalid date part: " + part)
			continue
		}

		if _, ok := timeUnits[unit]; !ok {
			log.Println("Invalid date unit: " + unit)
			continue
		}
		log.Printf("Part %s parsed as: Value: %s, Unit: %s\n", part, value, unit)

		var valueMs, _ = strconv.ParseInt(value, 10, 16)
		valueMs = valueMs * timeUnits[unit]
		milliseconds += valueMs
		log.Printf("Adding %dms to duration, now: %d\n", valueMs, milliseconds)
	}

	return milliseconds
}

func getEnv(key, def string) string {
	var value, exists = os.LookupEnv(key)
	if exists {
		return value
	}
	return def
}

func main() {
	log.SetFlags(0b111)

	var ROOT = strings.TrimSpace(getEnv("ROOT", "/tmp"))
	var ROOT_ARCHIVE = strings.TrimSpace(getEnv("ROOT_ARCHIVE", ROOT+"/archive"))
	var IGNORED_DIRECTORIES = strings.Split(getEnv("IGNORED_DIRECTORIES", ""), ",")
	IGNORED_DIRECTORIES = append(IGNORED_DIRECTORIES, ROOT_ARCHIVE)
	for key, dir := range IGNORED_DIRECTORIES {
		IGNORED_DIRECTORIES[key] = strings.TrimSpace(dir)
	}
	var ARCHIVE_THRESHOLD = parseDuration(getEnv("ARCHIVE_THRESHOLD", "1d"))
	var DELETE_THRESHOLD = parseDuration(getEnv("DELETE_THRESHOLD", "12h"))
	var SCAN_INTERVAL = parseDuration(getEnv("SCAN_INTERVAL", "1m"))
	log.Println("Input args parsed as:")
	log.Printf("ROOT: %s\n", ROOT)
	log.Printf("ROOT_ARCHIVE: %s\n", ROOT_ARCHIVE)
	log.Printf("IGNORED_DIRECTORIES: %s\n", IGNORED_DIRECTORIES)
	log.Printf("ARCHIVE_THRESHOLD: %d\n", ARCHIVE_THRESHOLD)
	log.Printf("DELETE_THRESHOLD: %d\n", DELETE_THRESHOLD)
	log.Printf("SCAN_INTERVAL: %d\n", SCAN_INTERVAL)
}