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use regex::Regex;
use reqwest::header::{HeaderMap, HeaderValue, AUTHORIZATION, CONTENT_TYPE};
use reqwest::StatusCode;
use serde::Serialize;
use std::error::Error;
use std::time::SystemTime;

mod constants;

pub struct Listen<'a> {
    pub artist: &'a str,
    pub track: &'a str,
    pub album: &'a str,
}

impl Listen<'_> {
    pub fn single(&self, uuid_user: &str) -> Result<StatusCode, Box<dyn Error>> {
        let time = SystemTime::now()
            .duration_since(SystemTime::UNIX_EPOCH)
            .unwrap()
            .as_secs();
        let song = Submission {
            listen_type: ListenType::Single,
            payload: vec![Payload {
                listened_at: time,
                track_metadata: TrackMetadata {
                    artist_name: self.artist,
                    track_name: self.track,
                    release_name: self.album,
                },
            }],
        };
        match submit_single(uuid_user, song) {
            Ok(status_code) => Ok(status_code),
            Err(e) => Err(e),
        }
    }
    pub fn playing_now(&self, uuid_user: &str) -> Result<StatusCode, Box<dyn Error>> {
        let song = Submission {
            listen_type: ListenType::PlayingNow,
            payload: vec![Payload {
                listened_at: 0,
                track_metadata: TrackMetadata {
                    artist_name: self.artist,
                    track_name: self.track,
                    release_name: self.album,
                },
            }],
        };
        match submit_playing_now(uuid_user, song) {
            Ok(status_code) => Ok(status_code),
            Err(e) => Err(e),
        }
    }
}
#[derive(Serialize, Default)]
pub struct Submission<'a> {
    pub listen_type: ListenType,
    pub payload: Vec<Payload<'a>>,
}

#[derive(Serialize, PartialEq)]
pub enum ListenType {
    #[serde(rename(serialize = "single"))]
    Single,
    #[serde(rename(serialize = "playing_now"))]
    PlayingNow,
    #[serde(rename(serialize = "import"))]
    Import,
}

impl Default for ListenType {
    fn default() -> Self {
        ListenType::Single
    }
}

#[derive(Serialize, Default)]
pub struct Payload<'a> {
    pub listened_at: u64,
    pub track_metadata: TrackMetadata<'a>,
}

#[derive(Serialize, Default)]
pub struct TrackMetadata<'a> {
    pub artist_name: &'a str,
    pub track_name: &'a str,
    pub release_name: &'a str,
}

pub fn submit_import(user_uuid: &str, sub: Submission) -> Result<StatusCode, Box<dyn Error>> {
    if sub.listen_type == ListenType::Import {
        let mut headers = HeaderMap::new();
        let mut auth = String::from("Token ");
        auth.push_str(user_uuid);
        headers.insert(AUTHORIZATION, HeaderValue::from_str(auth.as_str()).unwrap());
        headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/json"));
        let j = serde_json::to_string(&sub).unwrap();
        let res = reqwest::Client::new()
            .post((constants::API_ROOT_URL.to_string() + "/1/submit-listens").as_str())
            .headers(headers)
            .body(j)
            .send()?;
        return Ok(res.status());
    } else {
        return Err("error submitting import".into());
    }
}

pub fn submit_playing_now(user_uuid: &str, sub: Submission) -> Result<StatusCode, Box<dyn Error>> {
    if sub.listen_type == ListenType::PlayingNow && sub.payload.len() == 1 {
        let mut headers = HeaderMap::new();
        let mut auth = String::from("Token ");
        auth.push_str(user_uuid);
        headers.insert(AUTHORIZATION, HeaderValue::from_str(auth.as_str()).unwrap());
        headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/json"));
        let j = serde_json::to_string(&sub).unwrap();
        let re = Regex::new(r#""listened_at":\d+,"#).unwrap();
        let result = re.replace_all(j.as_str(), "");
        let res = reqwest::Client::new()
            .post((constants::API_ROOT_URL.to_string() + "/1/submit-listens").as_str())
            .headers(headers)
            .body(format!("{}", result))
            .send()?;
        return Ok(res.status());
    } else {
        return Err("error submitting playing_now: payload.len() must be 1".into());
    }
}

pub fn submit_single(user_uuid: &str, sub: Submission) -> Result<StatusCode, Box<dyn Error>> {
    if sub.listen_type == ListenType::Single
        && sub.payload.len() == 1
        && sub.payload.first().unwrap().listened_at != 0
    {
        let mut headers = HeaderMap::new();
        let mut auth = String::from("Token ");
        auth.push_str(user_uuid);
        headers.insert(AUTHORIZATION, HeaderValue::from_str(auth.as_str()).unwrap());
        headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/json"));
        let j = serde_json::to_string(&sub).unwrap();
        let res = reqwest::Client::new()
            .post((constants::API_ROOT_URL.to_string() + "/1/submit-listens").as_str())
            .headers(headers)
            .body(j)
            .send()?;
        return Ok(res.status());
    } else {
        return Err(
            "error submitting single: payload.len() must be 1 and listening_at field must be 0"
                .into(),
        );
    }
}

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
}