use crate::{
    addressing::Address,
    database::{entry::Entry, stores::UpStore, UpEndConnection, UpEndDatabase},
    util::jobs::JobContainer,
};
use anyhow::Result;
use log::{info, trace};
use rayon::iter::{IntoParallelRefIterator, ParallelIterator};
use std::{
    borrow::Borrow,
    sync::{Arc, Mutex, RwLock},
};

#[cfg(feature = "extractors-web")]
pub mod web;

#[cfg(feature = "extractors-audio")]
pub mod audio;

#[cfg(feature = "extractors-photo")]
pub mod photo;

pub trait Extractor {
    fn get(
        &self,
        address: &Address,
        connection: &UpEndConnection,
        store: Arc<Box<dyn UpStore + Send + Sync>>,
        job_container: JobContainer,
    ) -> Result<Vec<Entry>>;

    fn is_needed(&self, _address: &Address, _connection: &UpEndConnection) -> Result<bool> {
        Ok(true)
    }

    fn insert_info(
        &self,
        address: &Address,
        connection: &UpEndConnection,
        store: Arc<Box<dyn UpStore + Send + Sync>>,
        job_container: JobContainer,
    ) -> Result<usize> {
        if self.is_needed(address, connection)? {
            let entries = self.get(address, connection, store, job_container)?;

            connection.transaction(|| {
                let len = entries.len();
                for entry in entries {
                    connection.insert_entry(entry)?;
                }
                Ok(len)
            })
        } else {
            Ok(0)
        }
    }
}

pub fn extract_all<D: Borrow<UpEndDatabase>>(
    db: D,
    store: Arc<Box<dyn UpStore + Send + Sync>>,
    mut job_container: JobContainer,
) -> Result<usize> {
    info!("Extracting metadata for all addresses.");

    let db = db.borrow();
    let job_handle = job_container.add_job("EXTRACT_ALL", "Extracting additional metadata...")?;

    let all_addresses = db.connection()?.get_all_addresses()?;
    let total = all_addresses.len() as f32;
    let count = RwLock::new(0_usize);
    let shared_job_handle = Arc::new(Mutex::new(job_handle));

    let result = all_addresses
        .par_iter()
        .map(|address| {
            let connection = db.connection()?;
            let extract_result = extract(address, &connection, store.clone(), job_container.clone());

            let mut cnt = count.write().unwrap();
            *cnt += 1;

            shared_job_handle
                .lock()
                .unwrap()
                .update_progress(*cnt as f32 / total * 100.0)?;

            extract_result
        })
        .flatten()
        .sum();

    info!(
        "Done extracting metadata; processed {} addresses, added {} entries.",
        all_addresses.len(),
        result
    );

    Ok(result)
}

pub fn extract(
    address: &Address,
    connection: &UpEndConnection,
    store: Arc<Box<dyn UpStore + Send + Sync>>,
    job_container: JobContainer,
) -> Result<usize> {
    let mut entry_count = 0;
    trace!("Extracting metadata for {address:?}");

    #[cfg(feature = "extractors-web")]
    {
        entry_count +=
            web::WebExtractor.insert_info(address, connection, store.clone(), job_container.clone())?;
    }

    #[cfg(feature = "extractors-audio")]
    {
        entry_count +=
            audio::ID3Extractor.insert_info(address, connection, store.clone(), job_container.clone())?;
    }

    #[cfg(feature = "extractors-photo")]
    {
        entry_count +=
            photo::ExifExtractor.insert_info(address, connection, store.clone(), job_container)?;
    }

    trace!("Extracting metadata for {address:?} - got {entry_count} entries.");

    Ok(entry_count)
}