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//! Twitter integration for [Flows.network](https://flows.network)
//!
//! # Quick Start
//!
//! To get started, let's write a very tiny flow function.
//!
//! ```rust
//! use twitter_flows::create_tweet;
//! use slack_flows::{channel_msg_received};
//!
//! #[no_mangle]
//! pub fn run() {
//!     if let Some(sm) = channel_msg_received("myworkspace", "mychannel") {
//!         let tweet = serde_json::json!({
//!             "text": sm.text,
//!         });
//!         create_tweet("mytwitteruser", tweet);
//!     }
//! }
//! ```
//!
//! When the Slack message is received, create a new tweet in Twitter using [create_tweet].

use http_req::{
    request::{Method, Request},
    uri::Uri,
};
use lazy_static::lazy_static;
use serde_json::Value;
use urlencoding::encode;

lazy_static! {
    static ref TWITTER_API_PREFIX: String = String::from(
        std::option_env!("TWITTER_API_PREFIX")
            .unwrap_or("https://twitter-flows-extension.vercel.app/api")
    );
}

extern "C" {
    fn get_flows_user(p: *mut u8) -> i32;
    fn set_error_log(p: *const u8, len: i32);
}

/// Create a new tweet in Twitter.
///
/// `username` is the username of your connected Twitter account.
///
/// `tweet` is a serde_json::Value::Object which is corresponding to
/// the JSON body parameters of [Twitter
/// API](https://developer.twitter.com/en/docs/twitter-api/tweets/manage-tweets/api-reference/post-tweets)
///
/// If you have not connected your Twitter account with [Flows.network platform](https://flows.network),
/// you will receive an error in the flow's building log or running log.
///
pub fn create_tweet(username: String, tweet: Value) {
    unsafe {
        let mut flows_user = Vec::<u8>::with_capacity(100);
        let c = get_flows_user(flows_user.as_mut_ptr());
        flows_user.set_len(c as usize);
        let flows_user = String::from_utf8(flows_user).unwrap();

        let mut writer = Vec::new();
        let uri = format!(
            "{}/{}/create_tweet?account={}",
            TWITTER_API_PREFIX.as_str(),
            flows_user,
            encode(&username)
        );
        let uri = Uri::try_from(uri.as_str()).unwrap();
        let body = serde_json::to_vec(&tweet).unwrap_or_default();
        if let Ok(res) = Request::new(&uri)
            .method(Method::POST)
            .header("Content-Type", "application/json")
            .header("Content-Length", &body.len())
            .body(&body)
            .send(&mut writer)
        {
            if !res.status_code().is_success() {
                set_error_log(writer.as_ptr(), writer.len() as i32);
            }
        }
    }
}