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use std::num::NonZeroU32;
use anyhow::{anyhow, bail, Result};
use imap_codec::imap_types::sequence::{self, SequenceSet};
use crate::mail::uidindex::{ImapUid, UidIndex};
use crate::mail::unique_ident::UniqueIdent;
pub struct Index<'a>(pub &'a UidIndex);
impl<'a> Index<'a> {
pub fn fetch(self: &Index<'a>, sequence_set: &SequenceSet, by_uid: bool) -> Result<Vec<MailIndex<'a>>> {
let mail_vec = self
.0
.idx_by_uid
.iter()
.map(|(uid, uuid)| (*uid, *uuid))
.collect::<Vec<_>>();
let mut mails = vec![];
if by_uid {
if mail_vec.is_empty() {
return Ok(vec![]);
}
let iter_strat = sequence::Strategy::Naive {
largest: mail_vec.last().unwrap().0,
};
let mut i = 0;
for uid in sequence_set.iter(iter_strat) {
while mail_vec.get(i).map(|mail| mail.0 < uid).unwrap_or(false) {
i += 1;
}
if let Some(mail) = mail_vec.get(i) {
if mail.0 == uid {
mails.push(MailIndex {
i: NonZeroU32::try_from(i as u32 + 1).unwrap(),
uid: mail.0,
uuid: mail.1,
flags: self.0.table.get(&mail.1).ok_or(anyhow!("mail is missing from index"))?.1.as_ref(),
});
}
} else {
break;
}
}
} else {
if mail_vec.is_empty() {
bail!("No such message (mailbox is empty)");
}
let iter_strat = sequence::Strategy::Naive {
largest: NonZeroU32::try_from((mail_vec.len()) as u32).unwrap(),
};
for i in sequence_set.iter(iter_strat) {
if let Some(mail) = mail_vec.get(i.get() as usize - 1) {
mails.push(MailIndex {
i,
uid: mail.0,
uuid: mail.1,
flags: self.0.table.get(&mail.1).ok_or(anyhow!("mail is missing from index"))?.1.as_ref(),
});
} else {
bail!("No such mail: {}", i);
}
}
}
Ok(mails)
}
}
pub struct MailIndex<'a> {
pub i: NonZeroU32,
pub uid: ImapUid,
pub uuid: UniqueIdent,
pub flags: &'a Vec<String>
}
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