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use crate::{
    EventPhase,
    Kurinji,
    axis::MouseAxis,
    axis::GamepadAxis,
};
use bevy::prelude::*;
use std::{
    collections::HashMap,
    hash::Hash,
};
/// Data structure to hold bindings.
#[derive(Default, Clone, Debug)]
pub struct Bindings
{
    pub(crate) gamepad_button_bindings:
        HashMap<(usize, GamepadButtonType), String>,
    pub(crate) gamepad_axis_bindings:   HashMap<(usize, GamepadAxis), String>,
    pub(crate) keyboard_key_bindings:   HashMap<KeyCode, String>,
    pub(crate) mouse_button_binding:    HashMap<MouseButton, String>,
    pub(crate) mouse_move_binding:      HashMap<MouseAxis, String>,
    pub(crate) action_deadzone:         HashMap<String, f32>,
    pub(crate) action_phase:            HashMap<String, EventPhase>,
}
impl Bindings
{
    // publics
    pub fn merge(&mut self, bindings: Bindings)
    {
        // keyboard
        self.keyboard_key_bindings =
            Bindings::get_merged_hashmaps(self.keyboard_key_bindings.clone(),
                                          bindings.keyboard_key_bindings);
        // mouse
        self.mouse_button_binding =
            Bindings::get_merged_hashmaps(self.mouse_button_binding.clone(),
                                          bindings.mouse_button_binding);
        self.mouse_move_binding =
            Bindings::get_merged_hashmaps(self.mouse_move_binding.clone(),
                                          bindings.mouse_move_binding);
        // actions
        self.action_deadzone =
            Bindings::get_merged_hashmaps(self.action_deadzone.clone(),
                                          bindings.action_deadzone);
        self.action_phase =
            Bindings::get_merged_hashmaps(self.action_phase.clone(),
                                          bindings.action_phase);
    }

    // private
    // src: https://stackoverflow.com/questions/27244465/merge-two-hashmaps-in-rust
    fn get_merged_hashmaps<K: Hash + Eq + Clone, V: Clone>(map1: HashMap<K, V>,
                                                           map2: HashMap<K, V>)
                                                           -> HashMap<K, V>
    {
        map1.into_iter().chain(map2).collect()
    }
}
impl Kurinji
{
    // public
    pub fn get_bindings(&self) -> Bindings
    {
        Bindings { gamepad_button_bindings: self.joystick_button_binding
                                                .clone(),
                   gamepad_axis_bindings:   self.joystick_axis_binding.clone(),
                   keyboard_key_bindings:   self.keyboard_action_binding
                                                .clone(),
                   mouse_button_binding:    self.mouse_button_binding.clone(),
                   mouse_move_binding:      self.mouse_move_binding.clone(),

                   action_deadzone: self.action_deadzone.clone(),
                   action_phase:    self.action_phase.clone(), }
    }

    pub fn set_bindings(&mut self, bindings: Bindings)
    {
        self.joystick_button_binding = bindings.gamepad_button_bindings;
        self.joystick_axis_binding = bindings.gamepad_axis_bindings;
        self.keyboard_action_binding = bindings.keyboard_key_bindings;
        self.mouse_button_binding = bindings.mouse_button_binding;
        self.mouse_move_binding = bindings.mouse_move_binding;
        self.action_deadzone = bindings.action_deadzone;
        self.action_phase = bindings.action_phase;
    }
}