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use serde_derive::Deserialize;
use std::collections::{hash_map::Entry, HashMap};
use std::process::exit;

use super::{parse_config_file, ConfigStructure, Flattenable};
use crate::commands::{self, CommandKeybind, JoshutoCommand};
use crate::KEYMAP_FILE;

pub const BACKSPACE: i32 = 0x7F;
pub const TAB: i32 = 0x9;
pub const ENTER: i32 = 0xA;
pub const ESCAPE: i32 = 0x1B;

/* #define KEY_ALT(x) KEY_F(60) + (x - 'A') */

#[derive(Debug, Deserialize)]
struct JoshutoMapCommand {
    pub keys: Vec<i32>,
    pub command: String,
    #[serde(default)]
    pub args: Vec<String>,
}

#[derive(Debug, Deserialize)]
struct JoshutoRawKeymap {
    #[serde(default)]
    mapcommand: Vec<JoshutoMapCommand>,
}

impl Flattenable<JoshutoKeymap> for JoshutoRawKeymap {
    fn flatten(self) -> JoshutoKeymap {
        let mut keymaps = JoshutoKeymap::new();
        self.mapcommand.iter().for_each(|m| {
            let args: Vec<&str> = m.args.iter().map(|s| s.as_str()).collect();
            match commands::from_args(m.command.as_str(), &args) {
                Ok(command) => insert_keycommand(&mut keymaps, command, &m.keys[..]),
                Err(e) => eprintln!("{}", e),
            }
        });
        keymaps
    }
}

pub type JoshutoKeymap = HashMap<i32, CommandKeybind>;

impl ConfigStructure for JoshutoKeymap {
    fn get_config() -> Self {
        parse_config_file::<JoshutoRawKeymap, JoshutoKeymap>(KEYMAP_FILE)
            .unwrap_or_else(JoshutoKeymap::default)
    }
}

fn insert_keycommand(map: &mut JoshutoKeymap, keycommand: Box<JoshutoCommand>, keys: &[i32]) {
    match keys.len() {
        0 => {}
        1 => match map.entry(keys[0]) {
            Entry::Occupied(_) => {
                eprintln!("Error: Keybindings ambiguous");
                exit(1);
            }
            Entry::Vacant(entry) => {
                entry.insert(CommandKeybind::SimpleKeybind(keycommand));
            }
        },
        _ => match map.entry(keys[0]) {
            Entry::Occupied(mut entry) => match entry.get_mut() {
                CommandKeybind::CompositeKeybind(ref mut m) => {
                    insert_keycommand(m, keycommand, &keys[1..])
                }
                _ => {
                    eprintln!("Error: Keybindings ambiguous");
                    exit(1);
                }
            },
            Entry::Vacant(entry) => {
                let mut new_map = HashMap::new();
                insert_keycommand(&mut new_map, keycommand, &keys[1..]);
                let composite_command = CommandKeybind::CompositeKeybind(new_map);
                entry.insert(composite_command);
            }
        },
    }
}