// zotapi - Rust wrapper for Sot API as implemented by Hubzilla
// Copyright (C) 2018  Harald Eilertsen <haraldei@anduin.net>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use crate::{
    client::{self, Client},
    error::Error,
};
use serde::{Serialize, Serializer};

enum XChanSelector<'a> {
    Address(&'a str),
    Hash(&'a str),
    GUID(&'a str),
}

impl<'a> Serialize for XChanSelector<'a> {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        match *self {
            XChanSelector::Address(addr) => [("address", addr)].serialize(serializer),
            XChanSelector::Hash(hash) => [("hash", hash)].serialize(serializer),
            XChanSelector::GUID(guid) => [("guid", guid)].serialize(serializer),
        }
    }
}

pub struct XChanFetcher<'a> {
    client: &'a Client,
    data: Option<XChanSelector<'a>>,
}

impl<'a> XChanFetcher<'a> {
    pub fn new(client: &'a Client) -> XChanFetcher<'a> {
        XChanFetcher {
            client,
            data: None,
        }
    }

    pub fn by_address(&mut self, addr: &'a str) -> &mut XChanFetcher<'a> {
        self.data = Some(XChanSelector::Address(addr));
        self
    }

    pub fn by_hash(&mut self, hash: &'a str) -> &mut XChanFetcher<'a> {
        self.data = Some(XChanSelector::Hash(hash));
        self
    }

    pub fn by_guid(&mut self, guid: &'a str) -> &mut XChanFetcher<'a> {
        self.data = Some(XChanSelector::GUID(guid));
        self
    }

    pub fn fetch(&self) -> Result<String, Error> {
        self.client.fetch_stream(client::ZOTAPI_XCHAN_PATH, &self.data.as_ref().unwrap())
    }
}