/// This module is used for the indexing from any source.
pub mod curseforge_import;
pub mod local_import;

use crate::database::DatabaseError;
use crate::search::indexing::curseforge_import::index_curseforge;
use crate::search::indexing::local_import::index_local;
use crate::search::{SearchError, SearchMod};
use meilisearch_sdk::client::Client;
use meilisearch_sdk::settings::Settings;
use std::collections::{HashMap, VecDeque};

pub async fn index_mods(db: mongodb::Client) -> Result<(), SearchError> {
    // Check if the index exists
    let address = &*dotenv::var("MEILISEARCH_ADDR")?;
    let client = Client::new(address, "");

    let mut docs_to_add: Vec<SearchMod> = vec![];

    docs_to_add.append(&mut index_local(db.clone()).await?);
    if dotenv::var("INDEX_CURSEFORGE")
        .expect("`INDEX_CURSEFORGE` is missing in the .env file.")
        .parse()
        .unwrap()
    {
        docs_to_add.append(&mut index_curseforge(1, 400000).await?);
    }
    //Write Indexes
    //Relevance Index

    let mut relevance_index = client.get_or_create("relevance_mods").unwrap();

    let mut relevance_rules = default_rules();
    relevance_rules.push_back("desc(downloads)".to_string());

    relevance_index
        .set_settings(&default_settings().with_ranking_rules(relevance_rules.into()))
        .unwrap();
    relevance_index
        .add_documents(docs_to_add.clone(), Some("mod_id"))
        .unwrap();

    //Downloads Index
    let mut downloads_index = client.get_or_create("downloads_mods").unwrap();

    let mut downloads_rules = default_rules();
    downloads_rules.push_front("desc(downloads)".to_string());

    downloads_index
        .set_settings(&default_settings().with_ranking_rules(downloads_rules.into()))
        .unwrap();
    downloads_index
        .add_documents(docs_to_add.clone(), Some("mod_id"))
        .unwrap();

    //Updated Index
    let mut updated_index = client.get_or_create("updated_mods").unwrap();

    let mut updated_rules = default_rules();
    updated_rules.push_front("desc(updated)".to_string());

    updated_index
        .set_settings(&default_settings().with_ranking_rules(updated_rules.into()))
        .unwrap();
    updated_index
        .add_documents(docs_to_add.clone(), Some("mod_id"))
        .unwrap();

    //Created Index
    let mut newest_index = client.get_or_create("newest_mods").unwrap();

    let mut newest_rules = default_rules();
    newest_rules.push_back("desc(created)".to_string());

    newest_index
        .set_settings(&default_settings().with_ranking_rules(newest_rules.into()))
        .unwrap();
    newest_index
        .add_documents(docs_to_add.clone(), Some("mod_id"))
        .unwrap();

    Ok(())
}

//region Utils
fn default_rules() -> VecDeque<String> {
    vec![
        "typo".to_string(),
        "words".to_string(),
        "proximity".to_string(),
        "attribute".to_string(),
        "wordsPosition".to_string(),
        "exactness".to_string(),
    ]
    .into()
}

fn default_settings() -> Settings {
    let displayed_attributes = vec![
        "mod_id".to_string(),
        "author".to_string(),
        "title".to_string(),
        "description".to_string(),
        "keywords".to_string(),
        "versions".to_string(),
        "downloads".to_string(),
        "page_url".to_string(),
        "icon_url".to_string(),
        "author_url".to_string(),
        "date_created".to_string(),
        "created".to_string(),
        "date_modified".to_string(),
        "updated".to_string(),
        "latest_version".to_string(),
        "empty".to_string(),
    ];

    let searchable_attributes = vec![
        "title".to_string(),
        "description".to_string(),
        "keywords".to_string(),
        "versions".to_string(),
        "author".to_string(),
        "empty".to_string(),
    ];

    Settings::new()
        .with_displayed_attributes(displayed_attributes.clone())
        .with_searchable_attributes(searchable_attributes.clone())
        .with_accept_new_fields(true)
        .with_stop_words(vec![])
        .with_synonyms(HashMap::new())
}

//endregion