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use reqwest::StatusCode;
use super::deserialize as de;
use std::sync::Arc;
use std::collections::BTreeMap;

pub mod model {
    use std::sync::Arc;
    use std::collections::BTreeMap;
    
    /// The theme representation of a user.
    #[derive(serde::Serialize, Debug)]
    pub struct User {
        /// Their username.
        pub name: Arc<str>,
        /// Their "Display Name".
        pub realname: Arc<str>,
        
        /// True if user subscribes to last.fm pro.
        pub pro_subscriber: bool,
        /// Total scrobbles.
        pub scrobble_count: u64,
        /// Number of artists in library.
        pub artist_count: u64,
        /// Number of tracks in library.
        pub track_count: u64,
        /// Number of albums in library.
        pub album_count: u64,
        
        /// Link to user's profile picture.
        pub image_url: Arc<str>,
        
        /// Link to user's profile.
        pub url: Arc<str>
    }
    
    /// The theme representation of an artist
    #[derive(serde::Serialize, Debug)]
    pub struct Artist {
        /// The artist's name.
        pub name: Arc<str>,

        /// A link to their current image.
        pub image_url: Arc<str>,
        /// A link to their last.fm page.
        pub url: Arc<str>
    }

    /// The theme representation of a user's most recently scrobbled track.
    #[derive(serde::Serialize, Debug)]
    pub struct Scrobble {
        /// The name of the track.
        pub name: Arc<str>,
        /// The name of its album.
        pub album: Arc<str>,
        /// The artist who made it.
        pub artist: Artist,

        /// A link to the track image.
        pub image_url: Arc<str>,
        /// True if the user is currently scrobbling it, false if it's just the most recently played track.
        pub now_playing: bool,
        /// A link to the track's last.fm page.
        pub url: Arc<str>,

        /// True if the user has loved the track.
        pub loved: bool
    }

    /// The context passed in to all themes.
    ///
    /// Serialized as untagged, so themes should check if `error` is set and decide whether to show an error state or try rendering user info.
    #[derive(serde::Serialize, Debug)]
    #[serde(untagged)]
    pub enum Data {
        /// Contains text explaining a potential error.
        Error { error: &'static str },
        /// Contains data about a user and what they're listening to.
        Data { user: User, scrobble: Scrobble, query: BTreeMap<String, String> }
    }
}
#[derive(Debug)]
pub struct ResponseCtx(pub model::Data, pub StatusCode);

impl From<(Result<Arc<(de::User, de::Track)>, (StatusCode, &'static str)>, BTreeMap<String, String>)> for ResponseCtx {
    fn from(v: (Result<Arc<(de::User, de::Track)>, (StatusCode, &'static str)>, BTreeMap<String, String>)) -> ResponseCtx {
        let (v, q) = v;
        match v {
            Ok(a) => {
                let (user, track) = a.as_ref();
                ResponseCtx(model::Data::Data {
                    user: model::User {
                        name: user.name.clone(),
                        realname: user.realname.clone(),
                        
                        pro_subscriber: user.subscriber,
                        scrobble_count: user.playcount,
                        artist_count: user.artist_count,
                        track_count: user.track_count,
                        album_count: user.track_count,
                        
                        image_url: user.images.iter().max_by(|a, b| a.size.cmp(&b.size)).map(|a| a.url.clone()).unwrap_or_else(|| "".into()),
                        
                        url: user.url.clone()
                    },
                    scrobble: model::Scrobble {
                        name: track.name.clone(),
                        album: track.album.name.clone(),
                        artist: model::Artist {
                            name: track.artist.name.clone(),
                            image_url: track.artist.images.iter().max_by(|a, b| a.size.cmp(&b.size)).map(|a| a.url.clone()).unwrap_or_else(|| "".into()),
                            url: track.artist.url.clone().unwrap_or_else(|| "".into())
                        },
                        image_url: track.images.iter().max_by(|a, b| a.size.cmp(&b.size)).map(|a| a.url.clone()).unwrap_or_else(|| "".into()),
                        now_playing: track.attr.nowplaying,
                        url: track.url.clone(),
                        loved: track.loved.unwrap_or(false)
                    },
                    query: q
                }, StatusCode::OK)
            },
            Err((status, error)) => {
                ResponseCtx(model::Data::Error {error}, status)
            }
        }
    }
}