// 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::Client, error::Error};
use serde::Deserialize;
use std::convert::TryFrom;

#[derive(Debug, Default, Deserialize)]
pub struct XChan {
    #[serde(alias = "xchan_hash")]
    pub hash: String,

    #[serde(alias = "xchan_guid")]
    pub guid: String,

    #[serde(alias = "xchan_guid_sig")]
    pub guid_sig: String,

    #[serde(alias = "xchan_pubkey")]
    pub pubkey: String,

    #[serde(alias = "xchan_photo_mimetype")]
    pub photo_mimetype: String,

    #[serde(alias = "xchan_photo_l")]
    pub photo_l: String,

    #[serde(alias = "xchan_photo_m")]
    pub photo_m: String,

    #[serde(alias = "xchan_photo_s")]
    pub photo_s: String,

    // For some reason the address field will be exported as `addr`
    // when part of an aboox entry, but `address` when just exporting
    // the xchan. `addr` is the name used in the database table.

    #[serde(alias = "xchan_addr")]
    pub address: String,

    #[serde(alias = "xchan_url")]
    pub url: String,

    #[serde(alias = "xchan_connurl")]
    pub connurl: String,

    #[serde(alias = "xchan_follow")]
    pub follow: String,

    #[serde(alias = "xchan_connpage")]
    pub connpage: String,

    #[serde(alias = "xchan_name")]
    pub name: String,

    #[serde(alias = "xchan_network")]
    pub network: String,

    #[serde(alias = "xchan_instance_url")]
    pub instance_url: String,

    #[serde(alias = "xchan_flags")]
    pub flags: u32,

    #[serde(alias = "xchan_photo_date")]
    pub photo_date: String,

    #[serde(alias = "xchan_name_date")]
    pub name_date: String,

    #[serde(alias = "xchan_hidden")]
    pub hidden: u32,

    #[serde(alias = "xchan_orphan")]
    pub orphan: u32,

    #[serde(alias = "xchan_censored")]
    pub censored: u32,

    #[serde(alias = "xchan_selfcensored")]
    pub selfcensored: u32,

    #[serde(alias = "xchan_system")]
    pub system: u32,

    #[serde(alias = "xchan_pubforum")]
    pub pubforum: u32,

    #[serde(alias = "deleted", default)]
    pub deleted: u32,
}

impl XChan {
    pub fn z<'a>() -> XChanRequest<'a> {
        XChanRequest::default()
    }
}

impl<'a> TryFrom<&'a str> for XChan {
    type Error = Error;

    fn try_from(s: &'a str) -> Result<Self, Self::Error> {
        Ok(serde_json::from_str(s)?)
    }
}

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

#[derive(Default)]
pub struct XChanRequest<'a> {
    data: Option<XChanRequestSelector<'a>>,
}

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

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

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

    pub async fn fetch_raw(&self, client: &Client) -> Result<String, Error> {
        let mut req = client.get("xchan");

        if let Some(sel) = &self.data {
            req = match sel {
                XChanRequestSelector::Address(s) => req.query(&[("address", s.to_string())]),
                XChanRequestSelector::Hash(s)    => req.query(&[("hash", s.to_string())]),
                XChanRequestSelector::GUID(s)    => req.query(&[("guid", s.to_string())]),
            };
        }

        Ok(req.send().await?.text().await?)
    }

    pub async fn fetch(&self, client: &Client) -> Result<XChan, Error> {
        Ok(XChan::try_from(self.fetch_raw(&client).await?.as_str())?)
    }
}