package ratelimit

import (
	"strings"
	"time"

	"git.sendico.io/tech/sxchnge/shared/errors"
)

const (
	MinWindow = time.Second
	MaxWindow = 24 * time.Hour
	MaxLimit  = 10000
)

type WindowConfig struct {
	Limit  int    `yaml:"limit"`
	Window string `yaml:"window"`
}

type Window struct {
	Limit  int
	Window time.Duration
}

func ResolveWindow(raw WindowConfig, field string) (Window, error) {
	if raw.Limit < 1 || raw.Limit > MaxLimit {
		return Window{}, merrors.InvalidArgument("rate limit must be between 1 and 10000", field+".limit")
	}
	window, err := time.ParseDuration(strings.TrimSpace(raw.Window))
	if err != nil {
		return Window{}, merrors.InvalidArgument("rate limit window must be a valid duration", field+".window")
	}
	if window < MinWindow || window > MaxWindow {
		return Window{}, merrors.InvalidArgument("rate limit window must be between 1s and 24h", field+".window")
	}
	return Window{Limit: raw.Limit, Window: window}, nil
}