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/*
 * Copyright Stalwart Labs Ltd. See the COPYING
 * file at the top-level directory of this distribution.
 *
 * Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
 * https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
 * <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
 * option. This file may not be copied, modified, or distributed
 * except according to those terms.
 */

use crate::{Addr, Address, Group};

impl<'x> Address<'x> {
    /// Returns the first address in the list, or the first address in the first group.
    pub fn first(&self) -> Option<&Addr<'x>> {
        match self {
            Address::List(list) => list.first(),
            Address::Group(group) => group.iter().flat_map(|group| group.addresses.iter()).next(),
        }
    }

    /// Returns the last address in the list, or the last address in the last group.
    pub fn last(&self) -> Option<&Addr<'x>> {
        match self {
            Address::List(list) => list.last(),
            Address::Group(group) => group
                .iter()
                .flat_map(|group| group.addresses.iter())
                .next_back(),
        }
    }

    /// Converts the address into a list of `Addr`.
    pub fn into_list(self) -> Vec<Addr<'x>> {
        match self {
            Address::List(list) => list,
            Address::Group(group) => group
                .into_iter()
                .flat_map(|group| group.addresses)
                .collect(),
        }
    }

    /// Converts the address into a group of `Addr`.
    pub fn into_group(self) -> Vec<Group<'x>> {
        match self {
            Address::List(list) => list
                .into_iter()
                .map(|addr| Group {
                    name: None,
                    addresses: vec![addr],
                })
                .collect(),
            Address::Group(group) => group,
        }
    }

    /// Returns the list of addresses, or `None` if the address is a group.
    pub fn as_list(&self) -> Option<&[Addr<'x>]> {
        match self {
            Address::List(list) => Some(list),
            Address::Group(_) => None,
        }
    }

    /// Returns the group of addresses, or `None` if the address is a list.
    pub fn as_group(&self) -> Option<&[Group<'x>]> {
        match self {
            Address::List(_) => None,
            Address::Group(group) => Some(group),
        }
    }

    /// Returns an iterator over the addresses in the list, or the addresses in the groups.
    pub fn iter<'y: 'x>(&'y self) -> Box<dyn DoubleEndedIterator<Item = &Addr<'x>> + 'x> {
        match self {
            Address::List(list) => Box::new(list.iter()),
            Address::Group(group) => {
                Box::new(group.iter().flat_map(|group| group.addresses.iter()))
            }
        }
    }

    /// Returns whether the list contains the given address.
    pub fn contains(&self, addr: &str) -> bool {
        match self {
            Address::List(list) => list.iter().any(|a| {
                a.address
                    .as_ref()
                    .map_or(false, |a| a.eq_ignore_ascii_case(addr))
            }),
            Address::Group(group) => group.iter().any(|group| {
                group.addresses.iter().any(|a| {
                    a.address
                        .as_ref()
                        .map_or(false, |a| a.eq_ignore_ascii_case(addr))
                })
            }),
        }
    }

    pub fn into_owned(self) -> Address<'static> {
        match self {
            Address::List(list) => {
                Address::List(list.into_iter().map(|addr| addr.into_owned()).collect())
            }
            Address::Group(list) => {
                Address::Group(list.into_iter().map(|group| group.into_owned()).collect())
            }
        }
    }
}

impl<'x> Group<'x> {
    pub fn new(name: &'x str, addresses: Vec<Addr<'x>>) -> Self {
        Self {
            name: Some(name.into()),
            addresses,
        }
    }

    pub fn into_owned(self) -> Group<'static> {
        Group {
            name: self.name.map(|s| s.into_owned().into()),
            addresses: self.addresses.into_iter().map(|a| a.into_owned()).collect(),
        }
    }
}

impl<'x> Addr<'x> {
    pub fn new(name: Option<&'x str>, address: &'x str) -> Self {
        Self {
            name: name.map(|name| name.into()),
            address: Some(address.into()),
        }
    }

    pub fn into_owned(self) -> Addr<'static> {
        Addr {
            name: self.name.map(|s| s.into_owned().into()),
            address: self.address.map(|s| s.into_owned().into()),
        }
    }

    pub fn name(&self) -> Option<&str> {
        self.name.as_deref()
    }

    pub fn address(&self) -> Option<&str> {
        self.address.as_deref()
    }
}