use bevy::prelude::Resource;
use serde::Deserialize;
use std::collections::HashMap;
use std::fs;
use std::sync::OnceLock;

#[derive(Debug, Deserialize, Clone, Resource)]
pub struct GameConfig {
    pub initial_chunk_radius: i32,
    pub spawn_counts: SpawnCounts,
    #[serde(default)]
    pub display: DisplaySettings,
}

#[derive(Debug, Deserialize, Clone, Default)]
pub struct DisplaySettings {
    #[serde(default)]
    pub vsync: VsyncMode,
}

#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
pub enum VsyncMode {
    #[default]
    Vsync,
    Mailbox,
    Uncapped,
}

impl<'de> Deserialize<'de> for VsyncMode {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        let s = String::deserialize(deserializer)?;
        match s.as_str() {
            "vsync" => Ok(VsyncMode::Vsync),
            "mailbox" => Ok(VsyncMode::Mailbox),
            "uncapped" => Ok(VsyncMode::Uncapped),
            _ => Ok(VsyncMode::Vsync),
        }
    }
}

#[derive(Debug, Deserialize, Clone)]
pub struct SpawnCounts {
    pub dorfs: u32,
    pub pigs: u32,
    pub rabbits: u32,
}

impl GameConfig {
    pub fn load() -> Self {
        let config_str = fs::read_to_string("config.toml").expect("Failed to find config.toml");
        toml::from_str(&config_str).expect("Failed to parse config.toml")
    }
}

static TILE_REGISTRY: OnceLock<TileRegistry> = OnceLock::new();

#[derive(Debug, Deserialize, Clone)]
pub struct TileRegistry {
    pub floor_tiles: HashMap<String, FloorTileDef>,
    pub fixture_tiles: HashMap<String, FixtureTileDef>,
}

#[derive(Debug, Deserialize, Clone, Copy)]
pub struct FloorTileDef {
    pub id: u8,
    pub can_stand_in: bool,
    pub can_stand_on: bool,
    pub transparent: bool,
    pub astar_weight: u8,
}

#[derive(Debug, Deserialize, Clone, Copy)]
pub struct FixtureTileDef {
    pub id: u32,
    pub solid: bool,
}

impl TileRegistry {
    pub fn load() -> Self {
        let config_str = fs::read_to_string("tiles.toml").expect("Failed to find tiles.toml");
        toml::from_str(&config_str).expect("Failed to parse tiles.toml")
    }

    pub fn global() -> &'static Self {
        TILE_REGISTRY.get_or_init(|| Self::load())
    }

    pub fn floor(&self, name: &str) -> FloorTileDef {
        *self
            .floor_tiles
            .get(name)
            .unwrap_or_else(|| panic!("Unknown floor tile: {}", name))
    }

    pub fn fixture(&self, name: &str) -> FixtureTileDef {
        *self
            .fixture_tiles
            .get(name)
            .unwrap_or_else(|| panic!("Unknown fixture tile: {}", name))
    }
}