use std::fmt::Debug;
use std::sync::Arc;

use indexmap::IndexMap;

use crate::static_data::DataLibrary;
use crate::static_data::Item;
use crate::{StringKey, ValueIdentifiable, ValueIdentifier};

/// A library to store all items.
pub trait ItemLibrary: DataLibrary<dyn Item> + ValueIdentifiable + Debug {}

/// A library to store all items.
#[derive(Debug)]
pub struct ItemLibraryImpl {
    /// A unique identifier so we know what value this is.
    identifier: ValueIdentifier,
    /// The underlying data structure.
    map: IndexMap<StringKey, Arc<dyn Item>>,
}

impl ItemLibraryImpl {
    /// Instantiates a new Item Library.
    pub fn new(capacity: usize) -> Self {
        Self {
            identifier: Default::default(),
            map: IndexMap::with_capacity(capacity),
        }
    }
}

impl ItemLibrary for ItemLibraryImpl {}

impl DataLibrary<dyn Item> for ItemLibraryImpl {
    fn map(&self) -> &IndexMap<StringKey, Arc<dyn Item>> {
        &self.map
    }

    fn get_modify(&mut self) -> &mut IndexMap<StringKey, Arc<dyn Item>> {
        &mut self.map
    }
}

impl ValueIdentifiable for ItemLibraryImpl {
    fn value_identifier(&self) -> ValueIdentifier {
        self.identifier
    }
}

#[cfg(test)]
pub mod tests {
    use hashbrown::HashSet;
    use std::sync::Arc;

    use crate::static_data::libraries::data_library::DataLibrary;
    use crate::static_data::libraries::item_library::ItemLibrary;
    use crate::static_data::{BattleItemCategory, ItemCategory};
    use crate::static_data::{ItemImpl, ItemLibraryImpl};

    fn build_item() -> ItemImpl {
        ItemImpl::new(
            &"foo".into(),
            ItemCategory::MiscItem,
            BattleItemCategory::MiscBattleItem,
            100,
            HashSet::new(),
        )
    }

    pub fn build() -> Box<dyn ItemLibrary> {
        let mut lib = ItemLibraryImpl::new(1);
        let m = build_item();
        // Borrow as mut so we can insert
        let w = &mut lib;
        w.add(&"foo".into(), Arc::new(m));
        // Drops borrow as mut

        Box::new(lib)
    }
}