package config

import (
	"os"
	"time"
)

type Config struct {
	Addr         string
	DBPath       string
	ArchiveAfter time.Duration

	// StaleAfter is how long a firing alert may go without a refreshing webhook
	// before the sweeper treats it as resolved. It must exceed Alertmanager's
	// repeat_interval (default 4h), which is what refreshes the alert.
	StaleAfter time.Duration
}

func Load() Config {
	addr := os.Getenv("TERDUT_ADDR")
	if addr == "" {
		addr = ":8080"
	}
	dbPath := os.Getenv("TERDUT_DB_PATH")
	if dbPath == "" {
		dbPath = "terdut.db"
	}
	archiveAfter := 7 * 24 * time.Hour
	if s := os.Getenv("TERDUT_ARCHIVE_AFTER"); s != "" {
		if d, err := time.ParseDuration(s); err == nil {
			archiveAfter = d
		}
	}
	staleAfter := 6 * time.Hour
	if s := os.Getenv("TERDUT_STALE_AFTER"); s != "" {
		if d, err := time.ParseDuration(s); err == nil {
			staleAfter = d
		}
	}
	return Config{Addr: addr, DBPath: dbPath, ArchiveAfter: archiveAfter, StaleAfter: staleAfter}
}