use crate::error::SqliteConfigError;
use domain::{ThemeColor, ThemeConfig};

pub fn theme_to_json(theme: &ThemeConfig) -> Result<String, SqliteConfigError> {
    let v = serde_json::json!({
        "primary": color_to_json(&theme.primary),
        "secondary": color_to_json(&theme.secondary),
        "accent": color_to_json(&theme.accent),
        "text": color_to_json(&theme.text),
        "background": color_to_json(&theme.background),
    });
    serde_json::to_string(&v).map_err(|e| SqliteConfigError::Serialization(e.to_string()))
}

pub fn theme_from_json(json: &str) -> Result<ThemeConfig, SqliteConfigError> {
    let v: serde_json::Value =
        serde_json::from_str(json).map_err(|e| SqliteConfigError::Serialization(e.to_string()))?;
    let err = |msg: &str| SqliteConfigError::Serialization(msg.into());

    Ok(ThemeConfig {
        primary: color_from_json(&v["primary"]).map_err(|_| err("invalid primary"))?,
        secondary: color_from_json(&v["secondary"]).map_err(|_| err("invalid secondary"))?,
        accent: color_from_json(&v["accent"]).map_err(|_| err("invalid accent"))?,
        text: color_from_json(&v["text"]).map_err(|_| err("invalid text"))?,
        background: color_from_json(&v["background"]).map_err(|_| err("invalid background"))?,
    })
}

fn color_to_json(c: &ThemeColor) -> serde_json::Value {
    serde_json::json!({ "r": c.r, "g": c.g, "b": c.b })
}

fn color_from_json(v: &serde_json::Value) -> Result<ThemeColor, SqliteConfigError> {
    let err = |msg: &str| SqliteConfigError::Serialization(msg.into());
    Ok(ThemeColor {
        r: v["r"].as_u64().ok_or_else(|| err("missing r"))? as u8,
        g: v["g"].as_u64().ok_or_else(|| err("missing g"))? as u8,
        b: v["b"].as_u64().ok_or_else(|| err("missing b"))? as u8,
    })
}