//! Results from parsing Innertube queries.
//! # Implementation example
//! ```no_run
//! # struct GetDateQuery;
//! use serde::Deserialize;
//! #[derive(Debug, Deserialize)]
//! struct Date {
//!     date_string: String,
//!     date_timestamp: usize,
//! }
//! impl ytmapi_rs::parse::ParseFrom<GetDateQuery> for Date {
//!     fn parse_from(
//!         p: ytmapi_rs::parse::ProcessedResult<GetDateQuery>,
//!     ) -> ytmapi_rs::Result<Self> {
//!         ytmapi_rs::json::from_json(p.json)
//!     }
//! }
//! ```
//! # Alternative implementation
//! An alternative to working directly with [`crate::json::Json`] is to add
//! `json-crawler` as a dependency and use the provided
//! `From<ProcessedResult> for JsonCrawlerOwned` implementation.
use crate::{
    auth::AuthToken,
    common::{AlbumID, ArtistChannelID, Thumbnail},
    error,
    json::Json,
    nav_consts::*,
    process::{fixed_column_item_pointer, flex_column_item_pointer},
    query::Query,
};
use crate::{RawResult, Result};
use json_crawler::{JsonCrawler, JsonCrawlerOwned};
use serde::de::DeserializeOwned;
use serde::{Deserialize, Serialize};
use std::fmt::Debug;

pub use album::*;
pub use artist::*;
pub use history::*;
pub use library::*;
pub use lyrics::*;
pub use playlists::*;
pub use podcasts::*;
pub use recommendations::*;
pub use search::*;
pub use upload::*;
pub use watch::*;

mod album;
mod artist;
mod continuations;
mod history;
mod library;
mod playlists;
mod podcasts;
mod rate;
mod recommendations;
mod search;
mod upload;

/// Describes how to parse the ProcessedResult from a Query into the target
/// type.
// By requiring ParseFrom to also implement Debug, this simplifies our Query ->
// String API.
pub trait ParseFrom<Q>: Debug + Sized {
    fn parse_from(p: ProcessedResult<Q>) -> crate::Result<Self>;
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum EpisodeDate {
    Live,
    Recorded { date: String },
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum EpisodeDuration {
    Live,
    Recorded { duration: String },
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
// Intentionally not marked non_exhaustive - not expecting this to change.
pub struct ParsedSongArtist {
    pub name: String,
    pub id: Option<ArtistChannelID<'static>>,
}
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
// Intentionally not marked non_exhaustive - not expecting this to change.
pub struct ParsedSongAlbum {
    pub name: String,
    pub id: AlbumID<'static>,
}

/// A result from the api that has been checked for errors and processed into
/// JSON.
pub struct ProcessedResult<'a, Q> {
    pub query: &'a Q,
    /// The raw string output returned from the web request to YouTube.
    pub source: String,
    /// The result once it has been deserialized from Json and processed to
    /// remove errors.
    pub json: Json,
}

impl<'a, Q: Query<A>, A: AuthToken> TryFrom<RawResult<'a, Q, A>> for ProcessedResult<'a, Q> {
    type Error = crate::Error;
    fn try_from(value: RawResult<'a, Q, A>) -> Result<Self> {
        let RawResult {
            json: source,
            query,
            ..
        } = value;
        let json = match source.as_str() {
            // Workaround for Get request returning empty string.
            "" => serde_json::Value::Null,
            other => serde_json::from_str(other)
                .map_err(|e| error::Error::response(format!("{:?}", e)))?,
        };
        let json = Json::new(json);
        Ok(Self {
            query,
            source,
            json,
        })
    }
}

impl<'a, Q> ProcessedResult<'a, Q> {
    pub(crate) fn destructure(self) -> (&'a Q, String, serde_json::Value) {
        let ProcessedResult {
            query,
            source,
            json,
        } = self;
        (query, source, json.inner)
    }
    pub(crate) fn clone_json(self) -> String {
        serde_json::to_string_pretty(&self.json)
            .expect("Serialization of serde_json::value should not fail")
    }
    pub(crate) fn get_json(&self) -> &serde_json::Value {
        &self.json.inner
    }
}

impl<'a, Q> ProcessedResult<'a, Q> {
    pub fn parse_into<O: ParseFrom<Q>>(self) -> Result<O> {
        O::parse_from(self)
    }
}

impl<'a, Q> From<ProcessedResult<'a, Q>> for JsonCrawlerOwned {
    fn from(value: ProcessedResult<Q>) -> Self {
        let (_, source, crawler) = value.destructure();
        JsonCrawlerOwned::new(source, crawler)
    }
}

// Should take FlexColumnItem? or Data?. Regular serde_json::Value could tryInto
// fixedcolumnitem also. Not sure if this should error.
// XXX: I think this should return none instead of error.
fn parse_song_artists(
    data: &mut impl JsonCrawler,
    col_idx: usize,
) -> Result<Vec<ParsedSongArtist>> {
    data.borrow_pointer(format!("{}/text/runs", flex_column_item_pointer(col_idx)))?
        .try_into_iter()?
        .step_by(2)
        .map(|mut item| parse_song_artist(&mut item))
        .collect()
}

fn parse_song_artist(data: &mut impl JsonCrawler) -> Result<ParsedSongArtist> {
    Ok(ParsedSongArtist {
        name: data.take_value_pointer("/text")?,
        id: data.take_value_pointer(NAVIGATION_BROWSE_ID).ok(),
    })
}

fn parse_song_album(data: &mut impl JsonCrawler, col_idx: usize) -> Result<ParsedSongAlbum> {
    Ok(ParsedSongAlbum {
        name: parse_flex_column_item(data, col_idx, 0)?,
        id: data.take_value_pointer(format!(
            "{}/text/runs/0{}",
            flex_column_item_pointer(col_idx),
            NAVIGATION_BROWSE_ID
        ))?,
    })
}

fn parse_flex_column_item<T: DeserializeOwned>(
    item: &mut impl JsonCrawler,
    col_idx: usize,
    run_idx: usize,
) -> Result<T> {
    let pointer = format!(
        "{}/text/runs/{run_idx}/text",
        flex_column_item_pointer(col_idx)
    );
    Ok(item.take_value_pointer(pointer)?)
}

fn parse_fixed_column_item<T: DeserializeOwned>(
    item: &mut impl JsonCrawler,
    col_idx: usize,
) -> Result<T> {
    let pointer = format!("{}/text/runs/0/text", fixed_column_item_pointer(col_idx));
    Ok(item.take_value_pointer(pointer)?)
}

mod lyrics {
    use super::{ParseFrom, ProcessedResult};
    use crate::nav_consts::{DESCRIPTION, DESCRIPTION_SHELF, RUN_TEXT, SECTION_LIST_ITEM};
    use crate::query::lyrics::GetLyricsQuery;
    use const_format::concatcp;
    use json_crawler::{JsonCrawler, JsonCrawlerOwned};
    use serde::{Deserialize, Serialize};

    #[derive(PartialEq, Debug, Clone, Serialize, Deserialize)]
    #[non_exhaustive]
    pub struct Lyrics {
        pub lyrics: String,
        pub source: String,
    }

    impl<'a> ParseFrom<GetLyricsQuery<'a>> for Lyrics {
        fn parse_from(p: ProcessedResult<GetLyricsQuery<'a>>) -> crate::Result<Self> {
            let json_crawler: JsonCrawlerOwned = p.into();
            let mut description_shelf = json_crawler.navigate_pointer(concatcp!(
                "/contents",
                SECTION_LIST_ITEM,
                DESCRIPTION_SHELF
            ))?;
            Ok(Lyrics {
                lyrics: description_shelf.take_value_pointer(DESCRIPTION)?,
                source: description_shelf.take_value_pointer(concatcp!("/footer", RUN_TEXT))?,
            })
        }
    }

    #[cfg(test)]
    mod tests {
        use crate::{
            auth::BrowserToken,
            common::{LyricsID, YoutubeID},
            parse::lyrics::Lyrics,
            process_json,
            query::lyrics::GetLyricsQuery,
        };

        #[tokio::test]
        async fn test_get_lyrics_query() {
            // Intro - Notorious BIG - Ready To Die
            let path = std::path::Path::new("./test_json/get_lyrics_20231219.json");
            let file = tokio::fs::read_to_string(path)
                .await
                .expect("Expect file read to pass during tests");
            // Blank query has no bearing on function
            let query = GetLyricsQuery::new(LyricsID::from_raw(""));
            let output = process_json::<_, BrowserToken>(file, query).unwrap();
            assert_eq!(
                output,
                Lyrics {
                    lyrics: "Push \r\nCome on, she almost there push, come on\r\nCome on, come on, push, it's almost there \r\nOne more time, come one\r\nCome on, push, baby, one more time \r\nHarder, harder, push it harder \r\nPush, push, come on \r\nOne more time, here it goes \r\nI see the head\r\nYeah, come on\r\nYeah, yeah\r\nYou did it, baby, yeah\r\n\r\nBut if you lose, don't ask no questions why\r\nThe only game you know is do or die\r\nAh-ha-ha\r\nHard to understand what a hell of a man\r\n\r\nHip hop the hippie the hippie\r\nTp the hip hop and you don't stop \r\nRock it out, baby bubba, to the boogie, the bang-bang\r\nThe boogie to the boogie that be\r\nNow what you hear is not a test, I'm rappin', to the beat \r\n\r\nGoddamn it, Voletta, what the fuck are you doin'?\r\nYou can't control that goddamn boy? (What?)\r\nI just saw Mr. Johnson, he told me he caught the motherfucking boy shoplifting \r\nWhat the fuck are you doing? (Kiss my black ass, motherfucker)\r\nYou can't control that god-, I don't know what the fuck to do with that boy\r\n(What the fuck do you want me to do?)\r\nIf if you can't fucking control that boy, I'ma send him\r\n(All you fucking do is bitch at me)\r\nBitch, bitch, I'ma send his motherfuckin' ass to a group home goddamnit, what?\r\nI'll smack the shit outta you bitch, what, what the fuck?\r\n(Kiss my black ass, motherfucker)\r\nYou're fuckin' up\r\n(Comin' in here smelling like sour socks you, dumb motherfucker) \r\n\r\nWhen I'm bustin' up a party I feel no guilt\r\nGizmo's cuttin' up for thee \r\nSuckers that's down with nei-\r\n\r\nWhat, nigga, you wanna rob them motherfuckin' trains, you crazy? \r\nYes, yes, motherfucker, motherfuckin' right, nigga, yes \r\nNigga, what the fuck, nigga? We gonna get-\r\nNigga, it's eighty-seven nigga, is you dead broke? \r\nYeah, nigga, but, but\r\nMotherfucker, is you broke, motherfucker? \r\nWe need to get some motherfuckin' paper, nigga \r\nNigga it's a train, ain't nobody never robbed no motherfuckin' train \r\nJust listen, man, is your mother givin' you money, nigga? \r\nMy moms don't give me shit nigga, it's time to get paid, nigga \r\nIs you with me? Motherfucker, is you with me? \r\nYeah, I'm with you, nigga, come on \r\nAlright then, nigga, lets make it happen then \r\nAll you motherfuckers get on the fuckin' floor \r\nGet on the motherfuckin' floor\r\nChill, give me all your motherfuckin' money \r\nAnd don't move, nigga\r\nI want the fuckin' jewelry \r\nGive me every fuckin' thing \r\nNigga, I'd shut the fuck up or I'ma blow your motherfuckin' brains out \r\nShut the fuck up, bitch, give me your fuckin' money, motherfucker\r\nFuck you, bitch, get up off that shit \r\nWhat the fuck you holdin' on to that shit for, bitch? \r\n\r\nI get money, money I got\r\nStunts call me honey if they feel real hot\r\n\r\nOpen C-74, Smalls \r\nMr. Smalls, let me walk you to the door \r\nSo how does it feel leavin' us? \r\nCome on, man, what kind of fuckin' question is that, man? \r\nTryin' to get the fuck up out this joint, dog \r\nYeah, yeah, you'll be back \r\nYou niggas always are \r\nGo ahead, man, what the fuck is you hollerin' about? \r\nYou won't see me up in this motherfucker no more \r\nWe'll see \r\nI got big plans nigga, big plans, hahaha".to_string(),
                    source: "Source: LyricFind".to_string()
                }
            );
        }
    }
}
mod watch {
    use super::{ParseFrom, ProcessedResult};
    use crate::{
        common::{LyricsID, PlaylistID},
        nav_consts::{NAVIGATION_PLAYLIST_ID, TAB_CONTENT},
        query::watch::{GetWatchPlaylistQuery, GetWatchPlaylistQueryID},
        Result,
    };
    use const_format::concatcp;
    use json_crawler::{JsonCrawler, JsonCrawlerBorrowed, JsonCrawlerOwned};
    use serde::{Deserialize, Serialize};

    #[derive(PartialEq, Debug, Clone, Deserialize, Serialize)]
    #[non_exhaustive]
    pub struct WatchPlaylist {
        // TODO: Implement tracks.
        /// Unimplemented!
        pub _tracks: Vec<()>,
        pub playlist_id: Option<PlaylistID<'static>>,
        pub lyrics_id: LyricsID<'static>,
    }

    impl<T: GetWatchPlaylistQueryID> ParseFrom<GetWatchPlaylistQuery<T>> for WatchPlaylist {
        fn parse_from(p: ProcessedResult<GetWatchPlaylistQuery<T>>) -> crate::Result<Self> {
            // TODO: Continuations
            let json_crawler: JsonCrawlerOwned = p.into();
            let mut watch_next_renderer = json_crawler.navigate_pointer("/contents/singleColumnMusicWatchNextResultsRenderer/tabbedRenderer/watchNextTabbedResultsRenderer")?;
            let lyrics_id =
                get_tab_browse_id(&mut watch_next_renderer.borrow_mut(), 1)?.take_value()?;
            let mut results = watch_next_renderer.navigate_pointer(concatcp!(
                TAB_CONTENT,
                "/musicQueueRenderer/content/playlistPanelRenderer/contents"
            ))?;
            let playlist_id = results.try_iter_mut()?.find_map(|mut v| {
                v.take_value_pointer(concatcp!(
                    "/playlistPanelVideoRenderer",
                    NAVIGATION_PLAYLIST_ID
                ))
                .ok()
            });
            Ok(WatchPlaylist {
                _tracks: Vec::new(),
                playlist_id,
                lyrics_id,
            })
        }
    }

    // Should be a Process function not Parse.
    // XXX: Only used here!
    fn get_tab_browse_id<'a>(
        watch_next_renderer: &'a mut JsonCrawlerBorrowed,
        tab_id: usize,
    ) -> Result<JsonCrawlerBorrowed<'a>> {
        // TODO: Safe option that returns none if tab doesn't exist.
        let path = format!("/tabs/{tab_id}/tabRenderer/endpoint/browseEndpoint/browseId");
        watch_next_renderer.borrow_pointer(path).map_err(Into::into)
    }
}
mod song {
    use super::ParseFrom;
    use crate::{common::SongTrackingUrl, query::song::GetSongTrackingUrlQuery};
    use json_crawler::{JsonCrawler, JsonCrawlerOwned};

    impl<'a> ParseFrom<GetSongTrackingUrlQuery<'a>> for SongTrackingUrl<'static> {
        fn parse_from(
            p: super::ProcessedResult<GetSongTrackingUrlQuery<'a>>,
        ) -> crate::Result<Self> {
            let mut crawler = JsonCrawlerOwned::from(p);
            crawler
                .take_value_pointer("/playbackTracking/videostatsPlaybackUrl/baseUrl")
                .map_err(Into::into)
        }
    }

    #[cfg(test)]
    mod tests {
        use crate::{
            auth::BrowserToken,
            common::{SongTrackingUrl, VideoID, YoutubeID},
            query::song::GetSongTrackingUrlQuery,
        };

        #[tokio::test]
        async fn test_get_song_tracking_url_query() {
            let output = SongTrackingUrl::from_raw("https://s.youtube.com/api/stats/playback?cl=655300395&docid=FZ8BxMU3BYc&ei=JSimZqHaNeyB9fwP9oqh0Ak&fexp=&ns=yt&plid=AAYeTNocW-liNkl6&el=detailpage&len=193&of=URbTjA0hNUiM-oZxeU_KzQ&osid=AAAAAYfxXtM%3AAOeUNAZhCDiglWHfELd4I0ksz0dyuGtLVg&uga=m32&vm=CAMQARgBOjJBSHFpSlRJMDQteFk3b0Z2MUZXblN3NTlza3ZKcEhkcXpWeVhhMXl4RGQyZXVFR2twZ2JiQU9BckJGdG4zbDdCcElKTGJHNkt3dlJVX2ZzZGdKMndGR1ZZdk92MVItWWYtUTBOYmdFQnYxd3J6cGJBNzdrZUJXMlQ0QWR4MVo4S1Rza1JTM0hvWGRTd2llYk5xZFd6Nne4AQE");
            parse_test_value!(
                "./test_json/get_song_tracking_url_20240728.json",
                output,
                GetSongTrackingUrlQuery::new(VideoID::from_raw("")).unwrap(),
                BrowserToken
            );
        }
    }
}