use super::{
    hotbar::{self, Slot as HotbarSlot},
    img_ids,
    item_imgs::{ItemImgs, ItemKey},
    util,
};
use crate::ui::slot::{self, SlotKey, SumSlot};
use common::comp::{
    ability::AbilityInput, slot::InvSlotId, Ability, ActiveAbilities, Body, Energy, Inventory,
    SkillSet,
};
use conrod_core::{image, Color};
use specs::Entity as EcsEntity;

pub use common::comp::slot::{ArmorSlot, EquipSlot};

#[derive(Clone, Copy, Debug, PartialEq)]
pub enum SlotKind {
    Inventory(InventorySlot),
    Equip(EquipSlot),
    Hotbar(HotbarSlot),
    Trade(TradeSlot),
    /* Spellbook(SpellbookSlot), TODO */
}

pub type SlotManager = slot::SlotManager<SlotKind>;

#[derive(Clone, Copy, Debug, PartialEq)]
pub struct InventorySlot {
    pub slot: InvSlotId,
    pub entity: EcsEntity,
    pub ours: bool,
}

impl SlotKey<Inventory, ItemImgs> for InventorySlot {
    type ImageKey = ItemKey;

    fn image_key(&self, source: &Inventory) -> Option<(Self::ImageKey, Option<Color>)> {
        source.get(self.slot).map(|i| (i.into(), None))
    }

    fn amount(&self, source: &Inventory) -> Option<u32> {
        source
            .get(self.slot)
            .map(|item| item.amount())
            .filter(|amount| *amount > 1)
    }

    fn image_ids(key: &Self::ImageKey, source: &ItemImgs) -> Vec<image::Id> {
        source.img_ids_or_not_found_img(key.clone())
    }
}

impl SlotKey<Inventory, ItemImgs> for EquipSlot {
    type ImageKey = ItemKey;

    fn image_key(&self, source: &Inventory) -> Option<(Self::ImageKey, Option<Color>)> {
        let item = source.equipped(*self);
        item.map(|i| (i.into(), None))
    }

    fn amount(&self, _: &Inventory) -> Option<u32> { None }

    fn image_ids(key: &Self::ImageKey, source: &ItemImgs) -> Vec<image::Id> {
        source.img_ids_or_not_found_img(key.clone())
    }
}

#[derive(Clone, Copy, Debug, PartialEq)]
pub struct TradeSlot {
    pub index: usize,
    pub quantity: u32,
    pub invslot: Option<InvSlotId>,
    pub entity: EcsEntity,
    pub ours: bool,
}

impl SlotKey<Inventory, ItemImgs> for TradeSlot {
    type ImageKey = ItemKey;

    fn image_key(&self, source: &Inventory) -> Option<(Self::ImageKey, Option<Color>)> {
        self.invslot.and_then(|inv_id| {
            InventorySlot {
                slot: inv_id,
                ours: self.ours,
                entity: self.entity,
            }
            .image_key(source)
        })
    }

    fn amount(&self, source: &Inventory) -> Option<u32> {
        self.invslot
            .and_then(|inv_id| {
                InventorySlot {
                    slot: inv_id,
                    ours: self.ours,
                    entity: self.entity,
                }
                .amount(source)
            })
            .map(|x| x.min(self.quantity))
    }

    fn image_ids(key: &Self::ImageKey, source: &ItemImgs) -> Vec<image::Id> {
        source.img_ids_or_not_found_img(key.clone())
    }
}

#[derive(Clone, PartialEq)]
pub enum HotbarImage {
    Item(ItemKey),
    Ability(String),
}

type HotbarSource<'a> = (
    &'a hotbar::State,
    &'a Inventory,
    &'a Energy,
    &'a SkillSet,
    &'a ActiveAbilities,
    &'a Body,
);
type HotbarImageSource<'a> = (&'a ItemImgs, &'a img_ids::Imgs);

impl<'a> SlotKey<HotbarSource<'a>, HotbarImageSource<'a>> for HotbarSlot {
    type ImageKey = HotbarImage;

    fn image_key(
        &self,
        (hotbar, inventory, energy, skillset, active_abilities, body): &HotbarSource<'a>,
    ) -> Option<(Self::ImageKey, Option<Color>)> {
        const GREYED_OUT: Color = Color::Rgba(0.3, 0.3, 0.3, 0.8);
        hotbar.get(*self).and_then(|contents| match contents {
            hotbar::SlotContents::Inventory(item_hash, item_key) => {
                let item = inventory.get_by_hash(item_hash);
                match item {
                    Some(item) => Some((HotbarImage::Item(item.into()), None)),
                    None => Some((HotbarImage::Item(item_key), Some(GREYED_OUT))),
                }
            },
            hotbar::SlotContents::Ability(i) => {
                let ability_id = active_abilities
                    .auxiliary_set(Some(inventory), Some(skillset))
                    .get(i)
                    .and_then(|a| Ability::from(*a).ability_id(Some(inventory)));

                ability_id
                    .map(|id| HotbarImage::Ability(id.to_string()))
                    .and_then(|image| {
                        active_abilities
                            .activate_ability(
                                AbilityInput::Auxiliary(i),
                                Some(inventory),
                                skillset,
                                Some(body),
                            )
                            .map(|(ability, _)| {
                                (
                                    image,
                                    if energy.current() > ability.get_energy_cost() {
                                        Some(Color::Rgba(1.0, 1.0, 1.0, 1.0))
                                    } else {
                                        Some(GREYED_OUT)
                                    },
                                )
                            })
                    })
            },
        })
    }

    fn amount(&self, (hotbar, inventory, _, _, _, _): &HotbarSource<'a>) -> Option<u32> {
        hotbar
            .get(*self)
            .and_then(|content| match content {
                hotbar::SlotContents::Inventory(item_hash, _) => inventory.get_by_hash(item_hash),
                hotbar::SlotContents::Ability(_) => None,
            })
            .map(|item| item.amount())
            .filter(|amount| *amount > 1)
    }

    fn image_ids(
        key: &Self::ImageKey,
        (item_imgs, imgs): &HotbarImageSource<'a>,
    ) -> Vec<image::Id> {
        match key {
            HotbarImage::Item(key) => item_imgs.img_ids_or_not_found_img(key.clone()),
            HotbarImage::Ability(ability_id) => vec![util::ability_image(imgs, ability_id)],
        }
    }
}

impl From<InventorySlot> for SlotKind {
    fn from(inventory: InventorySlot) -> Self { Self::Inventory(inventory) }
}

impl From<EquipSlot> for SlotKind {
    fn from(equip: EquipSlot) -> Self { Self::Equip(equip) }
}

impl From<HotbarSlot> for SlotKind {
    fn from(hotbar: HotbarSlot) -> Self { Self::Hotbar(hotbar) }
}
impl From<TradeSlot> for SlotKind {
    fn from(trade: TradeSlot) -> Self { Self::Trade(trade) }
}

impl SumSlot for SlotKind {}