mod icon;
mod percent_value;
mod ui;
mod window;

pub use icon::IconConfig;
pub use percent_value::PercentValueConfig;
pub use ui::UiConfig;
pub use window::WindowConfig;

use dirs::config_dir;
use serde::Deserialize;
use std::path::PathBuf;
use thiserror::Error;

/// Errors returned by Popcorn configuration loading.
#[derive(Debug, Error)]
pub enum ConfigError {
    #[error("I/O error: {0}")]
    Io(std::io::Error),

    #[error("TOML parse error: {0}")]
    Toml(toml::de::Error),
}

/// Complete Popcorn configuration.
/// Combines window, UI, percent text, and icon styling.
#[derive(Debug, Deserialize, Default)]
pub struct PopcornConfig {
    #[serde(default)]
    pub window: WindowConfig,

    #[serde(default)]
    pub ui: UiConfig,

    #[serde(default)]
    pub percent_value: PercentValueConfig,

    #[serde(default)]
    pub icon: IconConfig,
}

impl PopcornConfig {
    /// Load the Popcorn configuration from:
    /// `~/.config/candywidgets/popcorn/config.toml`
    ///
    /// # Errors
    /// - `ConfigError::Io` if the file cannot be read  
    /// - `ConfigError::Toml` if the syntax is invalid
    pub fn load() -> Result<Self, ConfigError> {
        let path = config_dir()
            .unwrap_or_else(|| PathBuf::from("."))
            .join("candywidgets/popcorn/config.toml");

        let text = std::fs::read_to_string(path).map_err(ConfigError::Io)?;
        let cfg: PopcornConfig = toml::from_str(&text).map_err(ConfigError::Toml)?;
        Ok(cfg)
    }

    /// Load configuration.\
    /// If the file is missing or broken, fall back to built-in defaults.
    #[must_use]
    pub fn load_or_default() -> Self {
        Self::load().unwrap_or_default()
    }
}