#![warn(missing_docs)]
//! # beatsaver-rs
//!
//! This probject is a Rust library for interacting with the [BeatSaver](https://beatsaver.com/) api.
//!
//! The library is a work in progress and the API has not been stablized, so expect breaking changes.
//!
//! See also:
//! * [BeatSaver API Docs](https://docs.beatsaver.com/)
//!
//! # Using the API
//!
//! ```no_run
//! # #[cfg(all(feature = "reqwest_backend", not(feature = "surf_backend"), not(feature = "ureq_backend")))]
//! # mod main {
//! use beatsaver_rs::BeatSaverApi;
//! use beatsaver_rs::client::BeatSaver;
//! use beatsaver_rs::map::Map;
//! use bytes::Bytes;
//! use std::convert::TryInto;
//!
//! #[tokio::main]
//! async fn main() {
//!     let client = BeatSaver::new();
//!     let map: Map = client.map(&"1".try_into().unwrap()).await.unwrap();
//!     println!("Map by key: {}", map.name);
//!     let map: Map = client.map(&"fda568fc27c20d21f8dc6f3709b49b5cc96723be".try_into().unwrap()).await.unwrap();
//!     println!("Map by hash: {}", map.name);
//!     let map_download: Bytes = client.download((&map).into()).await.unwrap();
//!     // save map somewhere
//! }
//! # }
//! ```
use bytes::Bytes;
use chrono::{DateTime, NaiveDateTime, Utc};
use hex::{self, FromHexError};
use lazy_static::lazy_static;
use map::Map;
use serde::{de, Deserialize, Serialize};
use serde_json;
use std::collections::VecDeque;
use std::convert::{From, TryFrom, TryInto};
use std::error::Error;
use std::fmt;
use std::num::ParseIntError;
use std::string::FromUtf8Error;
use std::time::Duration;
use url::Url;

mod async_api;
pub mod client;
pub mod map;
mod sync_api;

lazy_static! {
    /// Base URL for the beatsaver API
    pub static ref BEATSAVER_URL: Url = Url::parse("https://beatsaver.com/").unwrap();
}

/// Holds data for a beatsaver user
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct BeatSaverUser {
    /// User ID (e.g. `5fbe7cd60192c700062b2a1f`)
    #[serde(alias = "_id")]
    pub id: String,
    /// User name (e.g. `qwerty01`)
    pub username: String,
}

/// Page metadata for APIs that paginate results
#[derive(Clone, Serialize, Deserialize)]
pub struct Page<T: Serialize> {
    /// List of documents in the page
    pub docs: VecDeque<T>,
    /// Total number of documents
    #[serde(alias = "totalDocs")]
    pub total_docs: usize,
    /// Last page available
    #[serde(alias = "lastPage")]
    pub last_page: usize,
    /// Previous page number
    ///
    /// Note: Set to `None` if you are on the first page
    #[serde(alias = "prevPage")]
    pub prev_page: Option<usize>,
    /// Next page number
    ///
    /// Note: Set to `None` if you are on the last page
    #[serde(alias = "nextPage")]
    pub next_page: Option<usize>,
}

struct DateTimeVisitor;
impl DateTimeVisitor {
    fn from<T>(v: T) -> DateTime<Utc>
    where
        T: Into<i64>,
    {
        let ts: i64 = v.into();
        let nts = NaiveDateTime::from_timestamp(ts / 1000, ((ts % 1000) as u32) * 1_000_000);
        DateTime::from_utc(nts, Utc)
    }
}
impl<'a> de::Visitor<'a> for DateTimeVisitor {
    type Value = DateTime<Utc>;

    fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "a unix timestamp (including milliseconds)")
    }
    fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
    where
        E: de::Error,
    {
        Ok(Self::from(value as i64))
    }
    fn visit_i64<E>(self, value: i64) -> Result<Self::Value, E>
    where
        E: de::Error,
    {
        Ok(Self::from(value))
    }
}
fn from_timestamp<'a, D>(d: D) -> Result<DateTime<Utc>, D::Error>
where
    D: de::Deserializer<'a>,
{
    d.deserialize_i64(DateTimeVisitor)
}

struct DurationVisitor;
impl DurationVisitor {
    fn from<T>(v: T) -> Duration
    where
        T: Into<u64>,
    {
        Duration::from_millis(v.into())
    }
}
impl<'a> de::Visitor<'a> for DurationVisitor {
    type Value = Duration;

    fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "an integer duration in milliseconds")
    }
    fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
    where
        E: de::Error,
    {
        Ok(Self::from(value))
    }
    fn visit_i64<E>(self, value: i64) -> Result<Self::Value, E>
    where
        E: de::Error,
    {
        Ok(Self::from(value as u64))
    }
}
fn from_duration<'a, D>(d: D) -> Result<Duration, D::Error>
where
    D: de::Deserializer<'a>,
{
    d.deserialize_u64(DurationVisitor)
}

/// Structure used for deserializing rate limit errors
#[derive(Clone, Debug, Deserialize)]
pub struct BeatSaverRateLimit {
    /// DateTime when the rate limit will expire
    #[serde(deserialize_with = "from_timestamp")]
    pub reset: DateTime<Utc>,
    /// Duration of the rate limit
    #[serde(alias = "resetAfter", deserialize_with = "from_duration")]
    pub reset_after: Duration,
}

/// Converts the body of a 429 response to a BeatSaverApiError::RateLimitError
pub fn rate_limit<T: Error>(data: Bytes) -> BeatSaverApiError<T> {
    let s = match String::from_utf8(data.as_ref().to_vec()) {
        Ok(s) => s,
        Err(e) => return e.into(),
    };
    let limit: BeatSaverRateLimit = match serde_json::from_str(s.as_str()) {
        Ok(b) => b,
        Err(e) => return e.into(),
    };
    BeatSaverApiError::RateLimitError(limit)
}

/// Error type for parsing a Map ID
#[derive(Debug, Clone, PartialEq)]
pub enum MapIdError {
    /// Error returned when the provided hash is invalid
    ///
    /// This can occur in the following conditions:
    /// * The length of the hash is not 24
    /// * The hash contains non-hex characters
    InvalidHash,
    /// Error returned if the provided key is invalid
    ///
    /// This can occur in the following conditions:
    /// * Key is larger than a [usize][std::usize]
    /// * Key contains non-hex characters
    ParseIntError(ParseIntError),
}
impl fmt::Display for MapIdError {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        match self {
            Self::InvalidHash => write!(f, "Specified hash is invalid"),
            Self::ParseIntError(e) => e.fmt(f),
        }
    }
}
impl Error for MapIdError {}
impl From<ParseIntError> for MapIdError {
    fn from(e: ParseIntError) -> Self {
        Self::ParseIntError(e)
    }
}
impl From<FromHexError> for MapIdError {
    fn from(_: FromHexError) -> Self {
        Self::InvalidHash
    }
}

/// Specifier used to index a map
#[derive(Debug, Clone, PartialEq)]
pub enum MapId {
    /// Identifier is a map key (e.g. `1`)
    Key(usize),
    /// Identifier is a map hash (e.g. `fda568fc27c20d21f8dc6f3709b49b5cc96723be`)
    Hash(String),
}
impl TryFrom<String> for MapId {
    type Error = MapIdError;

    fn try_from(s: String) -> Result<Self, Self::Error> {
        match s.len() {
            40 => {
                hex::decode(&s)?;
                Ok(Self::Hash(s))
            }
            _ => Ok(Self::Key(usize::from_str_radix(s.as_str(), 16)?)),
        }
    }
}
impl TryFrom<&str> for MapId {
    type Error = MapIdError;

    fn try_from(s: &str) -> Result<Self, Self::Error> {
        s.to_string().try_into()
    }
}
impl Into<MapId> for Map {
    fn into(self) -> MapId {
        MapId::Hash(self.hash)
    }
}
impl Into<MapId> for &Map {
    fn into(self) -> MapId {
        MapId::Hash(self.hash.clone())
    }
}

/// Error that could occur when querying the API
#[derive(Debug)]
pub enum BeatSaverApiError<T: fmt::Display> {
    /// Error originated from the request backend
    RequestError(T),
    /// Error originated from deserializing the api response
    SerializeError(serde_json::Error),
    /// Argument provided is invalid
    ArgumentError(&'static str),
    /// Conversion to a [String][std::string::String] failed
    Utf8Error(FromUtf8Error),
    /// Error in IO
    IoError(std::io::Error),
    /// Rate limit was hit while making the request
    RateLimitError(BeatSaverRateLimit),
}
impl<T: fmt::Display> fmt::Display for BeatSaverApiError<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            Self::RequestError(e) => <T as fmt::Display>::fmt(e, f),
            Self::SerializeError(e) => e.fmt(f),
            Self::ArgumentError(a) => write!(f, "Invalid argument: {}", a),
            Self::Utf8Error(e) => e.fmt(f),
            Self::IoError(e) => e.fmt(f),
            Self::RateLimitError(e) => {
                write!(
                    f,
                    "API rate limit hit (retry in {} ms)",
                    e.reset_after.as_millis()
                )
            }
        }
    }
}
impl<T: fmt::Display> From<serde_json::Error> for BeatSaverApiError<T> {
    fn from(e: serde_json::Error) -> Self {
        Self::SerializeError(e)
    }
}
impl<T: fmt::Display> From<FromUtf8Error> for BeatSaverApiError<T> {
    fn from(e: FromUtf8Error) -> Self {
        Self::Utf8Error(e)
    }
}
impl<T: fmt::Display> From<std::io::Error> for BeatSaverApiError<T> {
    fn from(e: std::io::Error) -> Self {
        Self::IoError(e)
    }
}

#[cfg(all(feature = "async", not(feature = "sync")))]
pub use async_api::BeatSaverApiAsync as BeatSaverApi;
#[cfg(feature = "async")]
pub use async_api::BeatSaverApiAsync;

#[cfg(all(feature = "sync", not(feature = "async")))]
pub use sync_api::BeatSaverApiSync as BeatSaverApi;
#[cfg(feature = "sync")]
pub use sync_api::BeatSaverApiSync;

#[cfg(test)]
mod tests {
    use crate::map::Map;
    use crate::{BeatSaverApiError, Page};
    use bytes::Bytes;
    use std::collections::HashMap;
    use std::error::Error;
    use std::fmt::{self, Display, Formatter};
    use url::Url;

    #[derive(Debug)]
    pub enum FakeError {}
    impl Display for FakeError {
        fn fmt(&self, _: &mut Formatter) -> fmt::Result {
            Ok(())
        }
    }
    impl Error for FakeError {}
    impl From<FakeError> for BeatSaverApiError<FakeError> {
        fn from(e: FakeError) -> Self {
            Self::RequestError(e)
        }
    }
    pub struct FakeClient {
        pub url: Url,
        pub data: Bytes,
    }
    impl FakeClient {
        pub fn new(url: Url, data: Bytes) -> Self {
            Self { url, data }
        }
    }
    pub struct FakeClientPaged {
        pub pages: HashMap<Url, Bytes>,
    }
    impl FakeClientPaged {
        pub fn new(pages: HashMap<Url, Bytes>) -> Self {
            Self { pages }
        }
    }

    #[test]
    fn test_page() {
        let data = r#"{"docs":[{"metadata":{"difficulties":{"easy":false,"normal":true,"hard":true,"expert":true,"expertPlus":true},"duration":0,"automapper":null,"characteristics":[{"name":"Standard","difficulties":{"easy":null,"normal":{"duration":417,"length":195,"bombs":4,"notes":301,"obstacles":24,"njs":10,"njsOffset":0},"hard":{"duration":417,"length":195,"bombs":4,"notes":486,"obstacles":24,"njs":10,"njsOffset":0},"expert":{"duration":417.5,"length":195,"bombs":4,"notes":620,"obstacles":24,"njs":10,"njsOffset":0},"expertPlus":{"duration":417.5,"length":195,"bombs":0,"notes":894,"obstacles":0,"njs":12,"njsOffset":0}}}],"songName":"Shut Up and Dance","songSubName":"WALK THE MOON","songAuthorName":"BennyDaBeast","levelAuthorName":"bennydabeast","bpm":128},"stats":{"downloads":418854,"plays":558,"downVotes":133,"upVotes":10763,"heat":395.8225333,"rating":0.9580848467461356},"description":"Difficulties: Expert+ (Added 11/15), Expert, Hard, Normal\r\nYouTube Preview: https://youtu.be/x9hJbTlPQUY","deletedAt":null,"_id":"5cff621148229f7d88fc77c9","key":"2144","name":"Shut Up and Dance - WALK THE MOON","uploader":{"_id":"5cff0b7298cc5a672c84e98d","username":"bennydabeast"},"uploaded":"2018-11-21T01:27:00.000Z","hash":"89cf8bb07afb3c59ae7b5ac00337d62261c36fb4","directDownload":"/cdn/2144/89cf8bb07afb3c59ae7b5ac00337d62261c36fb4.zip","downloadURL":"/api/download/key/2144","coverURL":"/cdn/2144/89cf8bb07afb3c59ae7b5ac00337d62261c36fb4.png"},{"metadata":{"difficulties":{"easy":false,"normal":true,"hard":true,"expert":true,"expertPlus":false},"duration":0,"automapper":null,"characteristics":[{"name":"Standard","difficulties":{"easy":null,"normal":{"duration":623.3125,"length":214,"bombs":0,"notes":462,"obstacles":25,"njs":10,"njsOffset":0},"hard":{"duration":623.3125,"length":214,"bombs":0,"notes":639,"obstacles":40,"njs":10,"njsOffset":0},"expert":{"duration":623.3125,"length":214,"bombs":0,"notes":825,"obstacles":40,"njs":10,"njsOffset":0},"expertPlus":null}}],"songName":"Mr. Blue Sky","songSubName":"Electric Light Orchestra","songAuthorName":"GreatYazer","levelAuthorName":"greatyazer","bpm":174},"stats":{"downloads":924827,"plays":39426,"downVotes":482,"upVotes":22614,"heat":94.0164429,"rating":0.9558554197954805},"description":"Channel your inner Baby Groot.  Normal, Hard, Expert\r\nSpecial thanks to BennydaBeast for his help on this track!","deletedAt":null,"_id":"5cff620d48229f7d88fc65f7","key":"570","name":"Mr. Blue Sky | Electric Light Orchestra","uploader":{"_id":"5cff0b7298cc5a672c84ea71","username":"greatyazer"},"uploaded":"2018-06-16T16:53:34.000Z","hash":"236173d5ba7dc379d480b9cb5fb6b4fa5abe77da","directDownload":"/cdn/570/236173d5ba7dc379d480b9cb5fb6b4fa5abe77da.zip","downloadURL":"/api/download/key/570","coverURL":"/cdn/570/236173d5ba7dc379d480b9cb5fb6b4fa5abe77da.jpg"},{"metadata":{"difficulties":{"easy":false,"normal":false,"hard":false,"expert":true,"expertPlus":false},"duration":0,"automapper":null,"characteristics":[{"name":"Standard","difficulties":{"easy":null,"normal":null,"hard":null,"expert":{"duration":476.7637634277344,"length":173,"bombs":52,"notes":722,"obstacles":28,"njs":14,"njsOffset":0},"expertPlus":null}}],"songName":"Caramelldansen (Speedcake Remix)","songSubName":"Caramell","songAuthorName":"Dack","levelAuthorName":"Dack","bpm":165},"stats":{"downloads":255909,"plays":0,"downVotes":247,"upVotes":13125,"heat":604.9830484,"rating":0.953954336380672},"description":"Preview: https://youtu.be/V5p0HOzunY0\n\n\nPatreon: https://www.patreon.com/Dack","deletedAt":null,"_id":"5cff621548229f7d88fc8904","key":"3cf5","name":"Caramelldansen","uploader":{"_id":"5cff0b7598cc5a672c852c6f","username":"dack"},"uploaded":"2019-03-09T22:54:54.000Z","hash":"cf5e32d6b7f30095f7198da5894139c92336cad7","directDownload":"/cdn/3cf5/cf5e32d6b7f30095f7198da5894139c92336cad7.zip","downloadURL":"/api/download/key/3cf5","coverURL":"/cdn/3cf5/cf5e32d6b7f30095f7198da5894139c92336cad7.jpg"},{"metadata":{"difficulties":{"easy":false,"normal":false,"hard":true,"expert":true,"expertPlus":false},"duration":0,"automapper":null,"characteristics":[{"name":"Standard","difficulties":{"easy":null,"normal":null,"hard":{"duration":475,"length":226,"bombs":0,"notes":620,"obstacles":10,"njs":10,"njsOffset":0},"expert":{"duration":475,"length":226,"bombs":0,"notes":738,"obstacles":11,"njs":12,"njsOffset":0},"expertPlus":null}}],"songName":"Feel Invincible","songSubName":"Skillet","songAuthorName":"Rustic","levelAuthorName":"rustic","bpm":126},"stats":{"downloads":264718,"plays":3479,"downVotes":90,"upVotes":7118,"heat":231.7496095,"rating":0.9538897573416698},"description":"Expert / Hard\r\nhttps://www.youtube.com/watch?v=nq-Qul4XxbE","deletedAt":null,"_id":"5cff620f48229f7d88fc6eba","key":"121f","name":"Skillet - Feel Invincible","uploader":{"_id":"5cff0b7298cc5a672c84e8c4","username":"rustic"},"uploaded":"2018-08-27T16:47:05.000Z","hash":"2e9ab6e1fb8055649e241cade98b018926cc93a8","directDownload":"/cdn/121f/2e9ab6e1fb8055649e241cade98b018926cc93a8.zip","downloadURL":"/api/download/key/121f","coverURL":"/cdn/121f/2e9ab6e1fb8055649e241cade98b018926cc93a8.jpg"},{"metadata":{"difficulties":{"easy":true,"normal":true,"hard":true,"expert":true,"expertPlus":false},"duration":0,"automapper":null,"characteristics":[{"name":"Standard","difficulties":{"easy":{"duration":418,"length":200,"bombs":0,"notes":216,"obstacles":0,"njs":10,"njsOffset":0},"normal":{"duration":418,"length":200,"bombs":0,"notes":388,"obstacles":8,"njs":10,"njsOffset":0},"hard":{"duration":418,"length":200,"bombs":0,"notes":514,"obstacles":10,"njs":11,"njsOffset":0},"expert":{"duration":418,"length":200,"bombs":0,"notes":560,"obstacles":12,"njs":12,"njsOffset":0},"expertPlus":null}}],"songName":"Believer (100k ver.)","songSubName":"Imagine Dragons","songAuthorName":"Rustic","levelAuthorName":"rustic","bpm":125},"stats":{"downloads":511866,"plays":9381,"downVotes":215,"upVotes":11898,"heat":379.8995099,"rating":0.9538005825373931},"description":"This is one of the 22 maps that were mapped for the 100k Contest where you can win over $7,000 in prizes. 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Enjoy!\r\nSee the map in action (Expert): https://www.youtube.com/watch?v=cWz6flYGs20\r\n\r\nThank you to my playtesters:\r\nQTPop (https://www.twitch.tv/qtpop)\r\nDuoVR (https://www.twitch.tv/duovr)\r\nSourgurl (https://www.twitch.tv/sourgurl)\r\nRexxxzi (https://www.twitch.tv/rexxxzi)\r\nAshleyriott (https://www.twitch.tv/ashleyriott)\r\n\r\nDiscord: @Fufu#5452","deletedAt":null,"_id":"5cff620f48229f7d88fc6f6c","key":"133b","name":"Daddy - PSY","uploader":{"_id":"5cff0b7398cc5a672c84f945","username":"fafurion"},"uploaded":"2018-09-02T23:43:45.000Z","hash":"dc489921185f92dfecb9cb07b84fc556123bd134","directDownload":"/cdn/133b/dc489921185f92dfecb9cb07b84fc556123bd134.zip","downloadURL":"/api/download/key/133b","coverURL":"/cdn/133b/dc489921185f92dfecb9cb07b84fc556123bd134.jpg"},{"metadata":{"difficulties":{"easy":false,"normal":false,"hard":true,"expert":true,"expertPlus":false},"duration":0,"automapper":null,"characteristics":[{"name":"Standard","difficulties":{"easy":null,"normal":null,"hard":{"duration":523.625,"length":245,"bombs":0,"notes":633,"obstacles":13,"njs":10,"njsOffset":0},"expert":{"duration":523.5650024414062,"length":245,"bombs":0,"notes":880,"obstacles":19,"njs":12,"njsOffset":0},"expertPlus":null}}],"songName":"Uprising","songSubName":"Muse","songAuthorName":"Rustic","levelAuthorName":"rustic","bpm":128},"stats":{"downloads":455551,"plays":11598,"downVotes":163,"upVotes":9190,"heat":84.4191212,"rating":0.9517991988617799},"description":"Expert / Hard\r\nhttps://youtu.be/WpFUt3UNp7c","deletedAt":null,"_id":"5cff620d48229f7d88fc655e","key":"4c6","name":"Muse - Uprising","uploader":{"_id":"5cff0b7298cc5a672c84e8c4","username":"rustic"},"uploaded":"2018-06-11T21:47:41.000Z","hash":"00e5671e594a6fe621c3605fcc5a0e4466ba6478","directDownload":"/cdn/4c6/00e5671e594a6fe621c3605fcc5a0e4466ba6478.zip","downloadURL":"/api/download/key/4c6","coverURL":"/cdn/4c6/00e5671e594a6fe621c3605fcc5a0e4466ba6478.jpg"},{"metadata":{"difficulties":{"easy":false,"expert":true,"expertPlus":true,"hard":false,"normal":false},"duration":0,"automapper":null,"characteristics":[{"difficulties":{"easy":null,"expert":{"duration":547,"length":234,"njs":12,"njsOffset":0,"bombs":0,"notes":705,"obstacles":10},"expertPlus":{"duration":547,"length":234,"njs":16,"njsOffset":0,"bombs":0,"notes":876,"obstacles":10},"hard":null,"normal":null},"name":"Standard"}],"levelAuthorName":"KikaeAeon","songAuthorName":"League of Legends & Against The Current","songName":"Legends Never Die","songSubName":"","bpm":140},"stats":{"downloads":141233,"plays":0,"downVotes":86,"upVotes":6203,"heat":997.2528853,"rating":0.9513775893989509},"description":"A special request from Prima1URGE","deletedAt":null,"_id":"5d91d6c1871b1a0006f9b3e7","key":"66e6","name":"League of Legends - Legends never die (ft. 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New version with changes according to the ranking criteria: Double directional notes fixed, flow improvements, removed fast dodge walls on bridge section.","deletedAt":null,"_id":"5cff621248229f7d88fc7b21","key":"26f6","name":"IGNITE (Ranked Version) [Sword Art Online Season 2 Opening] - Aoi Eir","uploader":{"_id":"5cff0b7498cc5a672c85050e","username":"joetastic"},"uploaded":"2018-12-20T01:21:47.000Z","hash":"125b07ebcc06fe9667e83fc2d6b9ae5ecbc72e8c","directDownload":"/cdn/26f6/125b07ebcc06fe9667e83fc2d6b9ae5ecbc72e8c.zip","downloadURL":"/api/download/key/26f6","coverURL":"/cdn/26f6/125b07ebcc06fe9667e83fc2d6b9ae5ecbc72e8c.jpg"}],"totalDocs":35367,"lastPage":3536,"prevPage":null,"nextPage":1}"#;

        let page: Page<Map> = serde_json::from_str(data).unwrap();

        assert_eq!(page.docs.len(), 10);
        assert_eq!(page.total_docs, 35367);
        assert_eq!(page.last_page, 3536);
        assert_eq!(page.prev_page, None);
        assert_eq!(page.next_page, Some(1));
    }
}