package main

import (
	"bufio"
	"io"
	"strings"
)

// parseQuotas reads a docker-mailserver dovecot-quotas.cf file: one
// "user@domain:quota=<size>" per line (see DMS docs). Returns per-user
// quota limits as raw strings. An absent or empty file means no limits.
func parseQuotas(r io.Reader) (map[string]string, error) {
	quotas := make(map[string]string)
	sc := bufio.NewScanner(r)
	for sc.Scan() {
		line := strings.TrimSpace(sc.Text())
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		email, kv, ok := strings.Cut(line, ":")
		email = strings.TrimSpace(email)
		if !ok || email == "" {
			continue
		}
		if _, quota, found := strings.Cut(kv, "="); found {
			quotas[email] = strings.TrimSpace(quota)
		}
	}
	return quotas, sc.Err()
}