use serde::{Deserialize, Serialize};
use std::convert::AsRef;
use strum::{AsRefStr, EnumIter};

/// Represents a key that the game recognises after input mapping.
#[derive(
    Clone,
    Copy,
    Debug,
    PartialEq,
    Eq,
    PartialOrd,
    Ord,
    Hash,
    Deserialize,
    Serialize,
    AsRefStr,
    EnumIter,
)]
pub enum GameInput {
    #[strum(serialize = "gameinput.primary")]
    Primary,
    #[strum(serialize = "gameinput.secondary")]
    Secondary,
    #[strum(serialize = "gameinput.block")]
    Block,
    #[strum(serialize = "gameinput.slot1")]
    Slot1,
    #[strum(serialize = "gameinput.slot2")]
    Slot2,
    #[strum(serialize = "gameinput.slot3")]
    Slot3,
    #[strum(serialize = "gameinput.slot4")]
    Slot4,
    #[strum(serialize = "gameinput.slot5")]
    Slot5,
    #[strum(serialize = "gameinput.slot6")]
    Slot6,
    #[strum(serialize = "gameinput.slot7")]
    Slot7,
    #[strum(serialize = "gameinput.slot8")]
    Slot8,
    #[strum(serialize = "gameinput.slot9")]
    Slot9,
    #[strum(serialize = "gameinput.slot10")]
    Slot10,
    #[strum(serialize = "gameinput.togglecursor")]
    ToggleCursor,
    #[strum(serialize = "gameinput.moveforward")]
    MoveForward,
    #[strum(serialize = "gameinput.moveback")]
    MoveBack,
    #[strum(serialize = "gameinput.moveleft")]
    MoveLeft,
    #[strum(serialize = "gameinput.moveright")]
    MoveRight,
    #[strum(serialize = "gameinput.jump")]
    Jump,
    #[strum(serialize = "gameinput.sit")]
    Sit,
    #[strum(serialize = "gameinput.dance")]
    Dance,
    #[strum(serialize = "gameinput.greet")]
    Greet,
    #[strum(serialize = "gameinput.glide")]
    Glide,
    #[strum(serialize = "gameinput.climb")]
    Climb,
    #[strum(serialize = "gameinput.climbdown")]
    ClimbDown,
    #[strum(serialize = "gameinput.swimup")]
    SwimUp,
    #[strum(serialize = "gameinput.swimdown")]
    SwimDown,
    #[strum(serialize = "gameinput.fly")]
    Fly,
    #[strum(serialize = "gameinput.sneak")]
    Sneak,
    #[strum(serialize = "gameinput.togglelantern")]
    ToggleLantern,
    #[strum(serialize = "gameinput.mount")]
    Mount,
    #[strum(serialize = "gameinput.chat")]
    Chat,
    #[strum(serialize = "gameinput.command")]
    Command,
    #[strum(serialize = "gameinput.escape")]
    Escape,
    #[strum(serialize = "gameinput.map")]
    Map,
    #[strum(serialize = "gameinput.bag")]
    Bag,
    #[strum(serialize = "gameinput.trade")]
    Trade,
    #[strum(serialize = "gameinput.social")]
    Social,
    #[strum(serialize = "gameinput.crafting")]
    Crafting,
    #[strum(serialize = "gameinput.spellbook")]
    Spellbook,
    #[strum(serialize = "gameinput.settings")]
    Settings,
    #[strum(serialize = "gameinput.toggleinterface")]
    ToggleInterface,
    #[strum(serialize = "gameinput.help")]
    Help,
    #[strum(serialize = "gameinput.toggledebug")]
    ToggleDebug,
    #[strum(serialize = "gameinput.fullscreen")]
    Fullscreen,
    #[strum(serialize = "gameinput.screenshot")]
    Screenshot,
    #[strum(serialize = "gameinput.toggleingameui")]
    ToggleIngameUi,
    #[strum(serialize = "gameinput.roll")]
    Roll,
    #[strum(serialize = "gameinput.respawn")]
    Respawn,
    #[strum(serialize = "gameinput.interact")]
    Interact,
    #[strum(serialize = "gameinput.togglewield")]
    ToggleWield,
    #[strum(serialize = "gameinput.swaploadout")]
    SwapLoadout,
    #[strum(serialize = "gameinput.freelook")]
    FreeLook,
    #[strum(serialize = "gameinput.autowalk")]
    AutoWalk,
    #[strum(serialize = "gameinput.cameraclamp")]
    CameraClamp,
    #[strum(serialize = "gameinput.cyclecamera")]
    CycleCamera,
    #[strum(serialize = "gameinput.select")]
    Select,
    #[strum(serialize = "gameinput.acceptgroupinvite")]
    AcceptGroupInvite,
    #[strum(serialize = "gameinput.declinegroupinvite")]
    DeclineGroupInvite,
    #[strum(serialize = "gameinput.mapzoomin")]
    MapZoomIn,
    #[strum(serialize = "gameinput.mapzoomout")]
    MapZoomOut,
}

impl GameInput {
    pub fn get_localization_key(&self) -> &str { self.as_ref() }

    /// Return true if `a` and `b` are able to be bound to the same key at the
    /// same time without conflict. For example, the player can't jump and climb
    /// at the same time, so these can be bound to the same key.
    pub fn can_share_bindings(a: GameInput, b: GameInput) -> bool {
        a.get_representative_binding() == b.get_representative_binding()
    }

    /// If two GameInputs are able to be bound at the same time, then they will
    /// return the same value from this function (the representative value for
    /// that set). This models the Find operation of a disjoint-set data
    /// structure.
    fn get_representative_binding(&self) -> GameInput {
        match self {
            GameInput::Jump => GameInput::Jump,
            GameInput::Climb => GameInput::Jump,
            GameInput::SwimUp => GameInput::Jump,
            GameInput::Respawn => GameInput::Jump,

            GameInput::FreeLook => GameInput::FreeLook,
            GameInput::AutoWalk => GameInput::FreeLook,

            _ => *self,
        }
    }
}