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package imap
import (
"net/mail"
"strconv"
"strings"
"golang.org/x/exp/maps"
"golang.org/x/exp/slices"
)
type parListWriter interface {
writeString(string)
writeByte(byte)
}
type singleParListWriter struct {
b *strings.Builder
}
func (s *singleParListWriter) writeString(v string) {
s.b.WriteString(v)
}
func (s *singleParListWriter) writeByte(v byte) {
s.b.WriteByte(v)
}
type dualParListWriter struct {
b1 *strings.Builder
b2 *strings.Builder
}
func (d *dualParListWriter) writeString(v string) {
d.b1.WriteString(v)
d.b2.WriteString(v)
}
func (d *dualParListWriter) writeByte(v byte) {
d.b1.WriteByte(v)
d.b2.WriteByte(v)
}
func (d *dualParListWriter) toSingleWriterFrom1st() parListWriter {
return &singleParListWriter{b: d.b1}
}
func (d *dualParListWriter) toSingleWriterFrom2nd() parListWriter {
return &singleParListWriter{b: d.b2}
}
type paramList struct {
firstItem bool
}
func newParamListWithGroup(writer parListWriter) paramList {
writer.writeByte('(')
return paramList{
firstItem: true,
}
}
func newParamListWithoutGroup() paramList {
return paramList{
firstItem: true,
}
}
func (c *paramList) newChildList(writer parListWriter) paramList {
c.firstItem = false
return newParamListWithGroup(writer)
}
func (c *paramList) finish(writer parListWriter) {
writer.writeByte(')')
}
func (c *paramList) onWrite(writer parListWriter) {
if !c.firstItem {
writer.writeByte(' ')
}
c.firstItem = false
}
func (c *paramList) addString(writer parListWriter, v string) *paramList {
c.onWrite(writer)
var str string
if len(v) == 0 {
str = "NIL"
} else {
str = strconv.Quote(v)
}
writer.writeString(str)
return c
}
func (c *paramList) addNumber(writer parListWriter, v int) *paramList {
c.onWrite(writer)
str := strconv.Itoa(v)
writer.writeString(str)
return c
}
func (c *paramList) addMap(writer parListWriter, v map[string]string) *paramList {
c.onWrite(writer)
keys := maps.Keys(v)
slices.Sort(keys)
child := c.newChildList(writer)
for _, key := range keys {
child.addString(writer, key).addString(writer, v[key])
}
child.finish(writer)
return c
}
func (c *paramList) addAddresses(writer parListWriter, v []*mail.Address) *paramList {
c.onWrite(writer)
child := c.newChildList(writer)
for _, addr := range v {
var user, domain string
if split := strings.Split(addr.Address, "@"); len(split) == 2 {
user, domain = split[0], split[1]
}
fields := child.newChildList(writer)
fields.
addString(writer, addr.Name).
addString(writer, "").
addString(writer, user).
addString(writer, domain)
fields.finish(writer)
}
child.finish(writer)
return c
}
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