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use std::convert::TryFrom;

use abnf_core::streaming::{DQUOTE, SP};
use nom::{
    branch::alt,
    bytes::streaming::{tag, tag_no_case, take_while1},
    combinator::{map, opt, value},
    multi::many0,
    sequence::{delimited, preceded, tuple},
    IResult,
};

use crate::{
    parse::{
        core::{
            astring, is_atom_char, is_resp_specials, nil, number, nz_number, quoted_char, string,
        },
        flag::{flag_list, mbx_list_flags},
        status::status_att_list,
    },
    types::{
        flag::FlagNameAttribute,
        mailbox::{ListCharString, ListMailbox, Mailbox, MailboxOther},
        response::Data,
    },
};

/// list-mailbox = 1*list-char / string
pub(crate) fn list_mailbox(input: &[u8]) -> IResult<&[u8], ListMailbox> {
    alt((
        map(take_while1(is_list_char), |bytes: &[u8]| {
            // Note: this is safe, because is_list_char enforces
            //       that the string only contains ASCII characters
            ListMailbox::Token(
                ListCharString::try_from(unsafe { String::from_utf8_unchecked(bytes.to_vec()) })
                    .unwrap(),
            ) // Safe to unwrap
        }),
        map(string, |istr| ListMailbox::String(istr.to_owned())),
    ))(input)
}

/// list-char = ATOM-CHAR / list-wildcards / resp-specials
pub(crate) fn is_list_char(i: u8) -> bool {
    is_atom_char(i) || is_list_wildcards(i) || is_resp_specials(i)
}

/// list-wildcards = "%" / "*"
pub(crate) fn is_list_wildcards(i: u8) -> bool {
    i == b'%' || i == b'*'
}

/// INBOX is case-insensitive. All case variants of INBOX (e.g., "iNbOx")
/// MUST be interpreted as INBOX not as an astring.
///
/// An astring which consists of the case-insensitive sequence
/// "I" "N" "B" "O" "X" is considered to be INBOX and not an astring.
///
/// Refer to section 5.1 for further semantic details of mailbox names.
///
/// mailbox = "INBOX" / astring
pub(crate) fn mailbox(input: &[u8]) -> IResult<&[u8], Mailbox> {
    map(astring, |astr| {
        match MailboxOther::try_from(astr.to_owned()) {
            Ok(other) => Mailbox::Other(other),
            Err(_) => Mailbox::Inbox,
        }
    })(input)
}

/// mailbox-data = "FLAGS" SP flag-list /
///                "LIST" SP mailbox-list /
///                "LSUB" SP mailbox-list /
///                "SEARCH" *(SP nz-number) /
///                "STATUS" SP mailbox SP "(" [status-att-list] ")" /
///                number SP "EXISTS" /
///                number SP "RECENT"
pub(crate) fn mailbox_data(input: &[u8]) -> IResult<&[u8], Data> {
    alt((
        map(
            tuple((tag_no_case(b"FLAGS"), SP, flag_list)),
            |(_, _, flags)| Data::Flags(flags),
        ),
        map(
            tuple((tag_no_case(b"LIST"), SP, mailbox_list)),
            |(_, _, (items, delimiter, mailbox))| Data::List {
                items: items.unwrap_or_default(),
                mailbox,
                delimiter,
            },
        ),
        map(
            tuple((tag_no_case(b"LSUB"), SP, mailbox_list)),
            |(_, _, (items, delimiter, mailbox))| Data::Lsub {
                items: items.unwrap_or_default(),
                mailbox,
                delimiter,
            },
        ),
        map(
            tuple((tag_no_case(b"SEARCH"), many0(preceded(SP, nz_number)))),
            |(_, nums)| Data::Search(nums),
        ),
        map(
            tuple((
                tag_no_case(b"STATUS"),
                SP,
                mailbox,
                SP,
                delimited(tag(b"("), opt(status_att_list), tag(b")")),
            )),
            |(_, _, mailbox, _, attributes)| Data::Status {
                mailbox,
                attributes: attributes.unwrap_or_default(),
            },
        ),
        map(
            tuple((number, SP, tag_no_case(b"EXISTS"))),
            |(num, _, _)| Data::Exists(num),
        ),
        map(
            tuple((number, SP, tag_no_case(b"RECENT"))),
            |(num, _, _)| Data::Recent(num),
        ),
    ))(input)
}

/// mailbox-list = "(" [mbx-list-flags] ")" SP
///                (DQUOTE QUOTED-CHAR DQUOTE / nil) SP
///                mailbox
fn mailbox_list(
    input: &[u8],
) -> IResult<&[u8], (Option<Vec<FlagNameAttribute>>, Option<char>, Mailbox)> {
    let mut parser = tuple((
        delimited(tag(b"("), opt(mbx_list_flags), tag(b")")),
        SP,
        alt((
            map(delimited(DQUOTE, quoted_char, DQUOTE), Option::Some),
            value(None, nil),
        )),
        SP,
        mailbox,
    ));

    let (remaining, (mbx_list_flags, _, maybe_delimiter, _, mailbox)) = parser(input)?;

    Ok((remaining, (mbx_list_flags, maybe_delimiter, mailbox)))
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_mailbox() {
        assert!(mailbox(b"\"iNbOx\"").is_ok());
        assert!(mailbox(b"{3}\r\naaa\r\n").is_ok());
        assert!(mailbox(b"inbox ").is_ok());
        assert!(mailbox(b"inbox.sent ").is_ok());
        assert!(mailbox(b"aaa").is_err());
    }
}