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// 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::error::Error;
use reqwest::{
    self,
    header::{ACCEPT, CONTENT_TYPE},
    StatusCode,
};
use serde::Serialize;
use std::collections::BTreeMap;
use std::io::Read;
use url::Url;

#[derive(Debug)]
pub struct Client {
    inner: reqwest::Client,
    base_url: Url,
    user: String,
    pw: String,
}

pub fn client(url: &str, user: &str, pw: &str) -> Client {
    Client {
        inner: reqwest::Client::new(),
        base_url: Url::parse(url).unwrap().join("api/z/1.0/").unwrap(),
        user: String::from(user),
        pw: String::from(pw),
    }
}

impl Client {
    fn url<T>(&self, path: &str, args: &T) -> String
    where
        T: Serialize + std::fmt::Debug,
    {
        let mut r = self.base_url.clone().join(path).unwrap();

        if let Ok(a) = serde_qs::to_string(dbg!(args)) {
            r.set_query(Some(&a));
        }

        r.to_string()
    }

    pub fn fetch_stream<T>(&self, path: &str, args: &T) -> Result<String, Error>
    where
        T: Serialize + std::fmt::Debug,
    {
        let url = dbg!(self.url(path, args));
        let res = self
            .inner
            .get(&url)
            .header(ACCEPT, "application/json")
            .basic_auth(self.user.clone(), Some(self.pw.clone()))
            .send()?;

        handle_result(res)
    }

    pub fn post_data<T>(&self, path: &str, data: &T) -> Result<String, Error>
    where
        T: Serialize + std::fmt::Debug,
    {
        let url = dbg!(self.url(path, &()));
        let res = dbg!(self
            .inner
            .post(&url)
            .header(ACCEPT, "application/json")
            .header(CONTENT_TYPE, "application/x-www-form-urlencoded")
            .basic_auth(self.user.clone(), Some(self.pw.clone()))
            .body(serde_qs::to_string(&data)?))
        //.form(&data))
        .send()?;

        handle_result(res)
    }

    pub fn post_multipart<T>(
        &self,
        path: &str,
        data: &BTreeMap<&str, T>,
        files: &Vec<&str>,
    ) -> Result<String, Error>
    where
        T: ToString,
    {
        let url = dbg!(self.url(path, &()));
        let mut form = reqwest::multipart::Form::new();

        for (key, value) in data.iter() {
            form = form.text(key.to_string(), value.to_string());
        }

        for f in files.iter() {
            form = form.file("media", f).unwrap();
        }

        let res = self
            .inner
            .post(&url)
            .basic_auth(self.user.clone(), Some(self.pw.clone()))
            .multipart(form)
            .send()?;

        handle_result(res)
    }
}

// A common function for handling the response after a request.
//
// Consumes the response, and return it as a string or an error.
fn handle_result(mut res: reqwest::Response) -> Result<String, Error> {
    match res.status() {
        StatusCode::UNAUTHORIZED => Err(Error::Unauthorized),
        StatusCode::OK => {
            let mut body = String::new();
            res.read_to_string(&mut body)?;
            Ok(body)
        }
        _ => {
            eprintln!("Received unknown status: {:?}", res.status());
            Err(Error::Unknown)
        }
    }
}