//! Home of the user configuratable content of graf karto, like keybindings and (TODO) colours etc.

use crate::client::input::{Binding, Button, Input, MouseButton, Scancode};
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;

/// All configuration parameters the user can set are contained in this struct.
#[allow(missing_docs)]
#[derive(Deserialize, Serialize)]
pub struct Config {
    pub tool_activation_binds: ToolActivationBinds,
    pub tool_general_binds: ToolGeneralBinds,
    pub icon_binds: IconToolBinds,
}

#[allow(missing_docs)]
#[derive(Deserialize, Serialize)]
/// The keys used to activate the individual tools. These keystrokes will not be sent to the tools,
/// but instead will be handled by the editor where the tools are registered.
pub struct ToolActivationBinds {
    pub deletion: Binding,
    pub icon: Binding,
    pub polygon_room: Binding,
    pub rect_room: Binding,
    pub selection: Binding,
    pub wall: Binding,
}

#[derive(Deserialize, Serialize)]
/// Keys that are useful to most tools. These are packaged so that not every tool has the same n keys
/// and then some more.
pub struct ToolGeneralBinds {
    /// Keybinding to, where applicable, place a single node (usually a vertex) for the tool in
    /// question.
    pub place_single: Binding,
    /// Finish up whatever one is doing with the current tool, without removing information.
    pub finish: Binding,
    /// Abort whatever one is doing with the current tool which means the last atomic action will not
    /// be pushed into the map items.
    pub abort: Binding,
}

#[derive(Clone, Serialize, Deserialize)]
/// Key bindings that are individually interesting to the icon tool.
pub struct IconToolBinds {
    /// Key to change to the next icon of the icon list.
    pub next: Binding,
    /// Key to change to the previous icon of the icon list.
    pub previous: Binding,
    /// Rotate the working icon clockwise by a certain amount (currently 45 degrees)
    pub rotate_clockwise: Binding,
    /// Rotate the working icon counterclockwise by a certain amount (currently 45 degrees)
    pub rotate_counterclockwise: Binding,
}

impl Config {
    /// Try to parse a configuration from the file located at path.
    ///
    /// # Errors
    /// If the file is not found or can not be read or parsed for a different reason, an IO-Error is
    /// returned.
    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)),
        }
    }

    /// Try to write the configuration to the file at path. If the file exists, it will be overwritten.
    ///
    /// # Errors
    /// If the file can not be written, for example for lack of permissions, an IO-Error is returned.
    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())
    }
}

/// Registers all bindings from the given configuration into the input handler. Should the
/// configuration change at runtime, the global bindings of the input handler need to be cleared and
/// this function must be called again.
pub fn register_bindings(config: &Config, input: &mut Input) {
    if !input.add_global(config.tool_activation_binds.deletion.clone()) {
        warn!("Tried to add deletion binding twice.");
    }
    if !input.add_global(config.tool_activation_binds.icon.clone()) {
        warn!("Tried to add icon binding twice.");
    }
    if !input.add_global(config.tool_activation_binds.polygon_room.clone()) {
        warn!("Tried to add polygon room binding twice.");
    }
    if !input.add_global(config.tool_activation_binds.rect_room.clone()) {
        warn!("Tried to add rect room binding twice.");
    }
    if !input.add_global(config.tool_activation_binds.selection.clone()) {
        warn!("Tried to add selection binding twice.");
    }
    if !input.add_global(config.tool_activation_binds.wall.clone()) {
        warn!("Tried to add wall binding twice.");
    }
    if !input.add_global(config.tool_general_binds.place_single.clone()) {
        warn!("Tried to add place single binding twice.");
    }
    if !input.add_global(config.tool_general_binds.finish.clone()) {
        warn!("Tried to add finish binding twice.");
    }
    if !input.add_global(config.tool_general_binds.abort.clone()) {
        warn!("Tried to add abort binding twice.");
    }
    if !input.add_global(config.icon_binds.next.clone()) {
        warn!("Tried to add next binding twice.");
    }
    if !input.add_global(config.icon_binds.previous.clone()) {
        warn!("Tried to add previous binding twice.");
    }
    if !input.add_global(config.icon_binds.rotate_clockwise.clone()) {
        warn!("Tried to add rotate clockwise binding twice.");
    }
    if !input.add_global(config.icon_binds.rotate_counterclockwise.clone()) {
        warn!("Tried to add rotate counterclockwise binding twice.");
    }
}

impl Default for Config {
    fn default() -> Self {
        Config {
            tool_activation_binds: ToolActivationBinds {
                deletion: Button::Text('d').into(),
                icon: Button::Text('i').into(),
                polygon_room: Button::Text('p').into(),
                rect_room: Button::Text('r').into(),
                selection: Button::Text('s').into(),
                wall: Button::Text('w').into(),
            },
            tool_general_binds: ToolGeneralBinds {
                place_single: Button::Mouse(MouseButton::Left).into(),
                finish: Button::Scancode(Scancode::Enter).into(),
                abort: Button::Mouse(MouseButton::Right).into(),
            },
            icon_binds: IconToolBinds {
                next: Button::Text('j').into(),
                previous: Button::Text('k').into(),
                rotate_clockwise: Button::Text('+').into(),
                rotate_counterclockwise: Button::Text('-').into(),
            },
        }
    }
}