use crate::button::*;
use ron::de::from_reader;
use ron::ser::{to_string_pretty, PrettyConfig};
use serde::{Deserialize, Serialize};
use std::fs::File;
use std::io::{self, Write};
use std::path::Path;

#[derive(Deserialize, Serialize)]
pub struct Config {
    pub deletion_keybindings: DeletionToolKeybindings,
    pub icon_keybindings: IconToolKeybindings,
    pub polygon_keybindings: PolygonRoomToolKeybindings,
    pub room_keybindings: RoomToolKeybindings,
    pub wall_keybindings: WallToolKeybindings,
}

pub trait ToolKeybindings {
    /// Get the key which will activate the tool it is made for.
    fn activation_key(&self) -> Button;
}

#[derive(Serialize, Deserialize)]
pub struct DeletionToolKeybindings {
    pub activation: Button,
    pub start_selection: Button,
    pub do_delete: Button,
    pub abort_deletion: Button,
}

#[derive(Serialize, Deserialize)]
pub struct IconToolKeybindings {
    pub activation: Button,
    pub next: Button,
    pub previous: Button,
    pub rotate_clockwise: Button,
    pub rotate_counterclockwise: Button,
    pub place: Button,
}

#[derive(Serialize, Deserialize)]
pub struct PolygonRoomToolKeybindings {
    pub activation: Button,
    pub place_node: Button,
    pub finish: Button,
    pub abort: Button,
}

#[derive(Serialize, Deserialize)]
pub struct RoomToolKeybindings {
    pub activation: Button,
    pub start_draw: Button,
    pub finish_draw: Button,
    pub abort_draw: Button,
}

#[derive(Serialize, Deserialize)]
pub struct WallToolKeybindings {
    pub activation: Button,
    pub start_wall: Button,
    pub finish_segment: Button,
    pub abort_segment: Button,
}

impl Config {
    pub fn from_file<P: AsRef<Path>>(path: P) -> io::Result<Config> {
        let file = File::open(&path)?;
        match from_reader(file) {
            Ok(data) => Ok(data),
            Err(err) => Err(io::Error::new(io::ErrorKind::InvalidData, err)),
        }
    }

    pub fn write_file<P: AsRef<Path>>(&self, path: P) -> io::Result<()> {
        let mut file = File::create(&path)?;

        let pretty_conf = PrettyConfig::new()
            .with_depth_limit(4)
            .with_decimal_floats(true)
            .with_separate_tuple_members(true)
            .with_indentor("\t".to_owned());
        let string = match to_string_pretty(&self, pretty_conf) {
            Ok(string) => string,
            Err(err) => {
                return Err(io::Error::new(io::ErrorKind::InvalidInput, err));
            }
        };

        file.write_all(&string.as_bytes())
    }
}

impl Default for Config {
    fn default() -> Self {
        Config {
            deletion_keybindings: DeletionToolKeybindings {
                activation: Button::Keyboard(KeyboardKey::D),
                start_selection: Button::Mouse(MouseButton::Left),
                do_delete: Button::Mouse(MouseButton::Left),
                abort_deletion: Button::Mouse(MouseButton::Right),
            },
            icon_keybindings: IconToolKeybindings {
                activation: Button::Keyboard(KeyboardKey::I),
                next: Button::Keyboard(KeyboardKey::I),
                previous: Button::Keyboard(KeyboardKey::J),
                rotate_clockwise: Button::Mouse(MouseButton::Right),
                rotate_counterclockwise: Button::Keyboard(KeyboardKey::Minus),
                place: Button::Mouse(MouseButton::Left),
            },
            polygon_keybindings: PolygonRoomToolKeybindings {
                activation: Button::Keyboard(KeyboardKey::P),
                place_node: Button::Mouse(MouseButton::Left),
                finish: Button::Keyboard(KeyboardKey::Enter),
                abort: Button::Mouse(MouseButton::Right),
            },
            room_keybindings: RoomToolKeybindings {
                activation: Button::Keyboard(KeyboardKey::R),
                start_draw: Button::Mouse(MouseButton::Left),
                finish_draw: Button::Mouse(MouseButton::Left),
                abort_draw: Button::Mouse(MouseButton::Right),
            },
            wall_keybindings: WallToolKeybindings {
                activation: Button::Keyboard(KeyboardKey::W),
                start_wall: Button::Mouse(MouseButton::Left),
                finish_segment: Button::Mouse(MouseButton::Left),
                abort_segment: Button::Mouse(MouseButton::Right),
            },
        }
    }
}

impl ToolKeybindings for DeletionToolKeybindings {
    fn activation_key(&self) -> Button {
        self.activation
    }
}
impl ToolKeybindings for IconToolKeybindings {
    fn activation_key(&self) -> Button {
        self.activation
    }
}
impl ToolKeybindings for PolygonRoomToolKeybindings {
    fn activation_key(&self) -> Button {
        self.activation
    }
}
impl ToolKeybindings for RoomToolKeybindings {
    fn activation_key(&self) -> Button {
        self.activation
    }
}
impl ToolKeybindings for WallToolKeybindings {
    fn activation_key(&self) -> Button {
        self.activation
    }
}