selene-core 0.4.2

use std::{
    fs, io,
    path::{Path, PathBuf},
};

use blake3::Hash;
use chrono::{Datelike, Timelike};
use lofty::{
    ogg::VorbisComments,
    tag::{Accessor, Tag, TagType, items::Timestamp},
};
use lunar_lib::{
    database::{
        CompareAndSwapTransaction, Database, DatabaseEntry, DatabaseError, TransactionError,
    },
    formatter::{FormatError, FormatTable, format_str},
};
use thiserror::Error;

use crate::{
    config::common::{LoudnormSettings, common_config},
    database::{LibraryDb, entry_extensions::EntryExtensions},
    errors::{LibraryError, MetadataError},
    library::{
        album::Album,
        artist::{Artist, add_from_artists},
        track::{
            Track, TrackId,
            track_meta::{TrackAlbumInfo, TrackMeta},
        },
    },
    media_container::{ContainerFormat, MediaContainer},
};

use super::lyric_data::LyricData;

// Core
impl Track {
    #[must_use]
    pub fn new(
        hash: Hash,
        src_container: MediaContainer,
        metadata: TrackMeta,
        relative_library_path: PathBuf,
    ) -> Self {
        Self {
            id: TrackId::new(hash),
            src_container,
            lib_container: None,
            relative_library_path,
            metadata,
            loudnorm_analysis: None,
            applied_loudnorm: None,
            version: Track::VERSION_NUMBER,
        }
    }
}

// Accessors
impl Track {
    #[must_use]
    pub fn id(&self) -> TrackId {
        self.id
    }

    #[must_use]
    pub fn loudnorm(&self) -> Option<&LoudnormSettings> {
        self.applied_loudnorm.as_ref()
    }

    #[must_use]
    pub fn src_container(&self) -> &MediaContainer {
        &self.src_container
    }

    #[must_use]
    pub fn lib_container(&self) -> Option<&MediaContainer> {
        self.lib_container.as_ref()
    }

    pub fn album(&self, db: &LibraryDb) -> Result<Option<TrackAlbumInfo>, DatabaseError> {
        if let Some(album_id) = self.metadata.album {
            Ok(Some({
                let album = Album::db_get_from(album_id, db)?.expect("Dangling album reference");

                let reference = album
                    .track_refs()
                    .iter()
                    .find(|t| t.id == self.id)
                    .expect("Track not found in album");

                let track_num = reference.track_num;
                let disc_num = reference.disc_num;

                TrackAlbumInfo {
                    album,
                    track_num,
                    disc_num,
                }
            }))
        } else {
            Ok(None)
        }
    }

    pub fn tx_album(
        &self,
        cas_tx: &mut CompareAndSwapTransaction<LibraryDb>,
    ) -> Result<Option<TrackAlbumInfo>, TransactionError> {
        if let Some(album_id) = self.metadata.album {
            Ok(Some({
                let album = cas_tx.tx_get(album_id)?.expect("Dangling album reference");

                let reference = album
                    .track_refs()
                    .iter()
                    .find(|t| t.id == self.id)
                    .expect("Dangling album>track reference");

                let track_num = reference.track_num;
                let disc_num = reference.disc_num;

                TrackAlbumInfo {
                    album,
                    track_num,
                    disc_num,
                }
            }))
        } else {
            Ok(None)
        }
    }
}

// Mutators
impl Track {
    pub fn metadata_key_values(
        &self,
        format: &ContainerFormat,
    ) -> Result<Vec<(String, String)>, MetadataError> {
        let mut tags = VorbisComments::new();
        {
            let db = LibraryDb::open()?;
            if let Some(track_album_info) = self.album(&db)? {
                tags.set_album(track_album_info.album.name.clone());

                let artists = track_album_info
                    .album
                    .artists()
                    .artists(&db)?
                    .iter()
                    .map(Artist::name)
                    .collect::<Vec<_>>()
                    .join(";");
                tags.insert("ALBUMARTIST".to_owned(), artists);

                if let Some(track_num) = track_album_info.track_num {
                    tags.set_track(track_num);
                    if let Some(track_total) = track_album_info.album.track_total {
                        tags.set_track_total(track_total);
                    }
                }

                if let Some(disc_num) = track_album_info.disc_num {
                    tags.set_disk(disc_num);
                    if let Some(disc_total) = track_album_info.album.disc_total {
                        tags.set_disk_total(disc_total);
                    }
                }
            }

            let artists = self
                .metadata
                .artists
                .artists(&db)?
                .iter()
                .map(Artist::name)
                .collect::<Vec<_>>()
                .join(";");
            tags.set_artist(artists);
        }

        if let Some(date) = self.metadata.date {
            let ts = Timestamp {
                year: date.year() as u16,
                month: Some(date.month() as u8),
                day: Some(date.day() as u8),
                hour: Some(date.hour() as u8),
                minute: Some(date.minute() as u8),
                second: Some(date.second() as u8),
            };
            tags.set_date(ts);
        }

        for genre in &self.metadata.genre {
            tags.push("GENRE".to_owned(), genre.to_owned());
        }

        if let Some(title) = &self.metadata.title {
            tags.set_title(title.to_owned());
        }

        if let Some(lyric_data) = &self.metadata.lyric_data {
            match lyric_data {
                LyricData::Instrumental => {
                    tags.insert("INSTRUMENTAL".to_owned(), "1".to_owned());
                }
                LyricData::Plain(lyrics) => {
                    tags.insert("UNSYNCEDLYRICS".to_owned(), lyrics.to_string());
                }
                LyricData::Synced(lyrics) => {
                    tags.insert("SYNCEDLYRICS".to_owned(), lyrics.to_lrc_string());
                }
            }
        }

        self.metadata.other.iter().for_each(|(k, v)| {
            tags.insert(k.to_uppercase(), v.to_owned());
        });

        let _ = tags.remove("ENCODEDBY");

        let tag_type = match format {
            ContainerFormat::Flac | ContainerFormat::Ogg => TagType::VorbisComments,
            ContainerFormat::Mpa | ContainerFormat::Wav => TagType::Id3v2,
            ContainerFormat::Aiff => TagType::AiffText,
            ContainerFormat::Ape => TagType::Ape,
        };

        let mut tags: Tag = tags.into();
        tags.re_map(tag_type);

        let tags = tags
            .items()
            .map(|tag| {
                (
                    tag.key().map_key(tag_type).unwrap().to_owned(),
                    tag.value().text().unwrap().to_owned(),
                )
            })
            .collect();

        Ok(tags)
    }
}

impl Track {
    /// Migrates a track from its relative path to the input library directory
    ///
    /// # Errors
    ///
    /// This function will error if:
    /// - The track does not exist in the library.
    /// - [`std::fs::rename()`] fails.
    /// - The track fails to patch using [`DatabaseEntry::db_patch()`].
    ///
    /// The database is patched AFTER the file is renamed, if the file renames succesfully, but the patch fails, this could lead to a minor desync between the internal storage and the filesystem.
    /// This can easily be revalidated via orphan relinking
    pub fn migrate(&mut self, library_dir: impl AsRef<Path>) -> Result<(), TrackRenameError> {
        let Some(lib_container) = &mut self.lib_container else {
            return Err(io::Error::new(
                io::ErrorKind::NotFound,
                "A library container was not found for the input track".to_string(),
            )
            .into());
        };

        let absolute_path = library_dir.as_ref().join(&self.relative_library_path);

        fs::create_dir_all(absolute_path.parent().expect("File cannot be root"))?;
        if let Err(err) = fs::rename(lib_container.path(), &absolute_path) {
            match err.kind() {
                io::ErrorKind::NotFound if fs::symlink_metadata(&absolute_path)?.is_file() => {}
                _ => return Err(err.into()),
            }
        }

        lib_container.set_path(absolute_path);

        Track::db_patch(self.clone(), None)?;

        Ok(())
    }
}

#[derive(Debug, Error)]
pub enum TrackRenameError {
    #[error("IoError: {0}")]
    Io(#[from] std::io::Error),

    #[error("DatabaseError: {0}")]
    Database(#[from] DatabaseError),

    #[error("TransactionError: {0}")]
    Transaction(#[from] TransactionError),

    #[error("FormatError: {0}")]
    Format(#[from] FormatError),

    #[error("LibraryError: {0}")]
    Library(#[from] LibraryError),

    #[error("{0}")]
    ConflictingNames(String),
}

/// Calculates the relative path for a track.
///
/// # Errors
///
/// Returns an error if database references cannot be obtained
pub fn calculate_rel_path(metadata: &TrackMeta) -> Result<PathBuf, TrackRenameError> {
    let db = LibraryDb::open()?;
    let artists = metadata.artists.artists(&db)?;
    let album = metadata.album(&db)?;

    let mut format_table = FormatTable::new();
    format_table.extend_from_taggable(metadata);
    add_from_artists(&mut format_table, &artists, "track");
    if let Some(album) = album {
        format_table.extend_from_taggable(&album);
    }

    let path = PathBuf::from(format_str(
        &common_config().track_name.format_string,
        &format_table,
    )?);

    Ok(path)
}