use std::{str::FromStr, sync::Arc};

use palette::{
    cam16::{Cam16Jch, Parameters},
    Darken, FromColor, IntoColor, Lighten, Oklch, Srgb,
};
use wasm_bindgen::prelude::wasm_bindgen;

use crate::errors;

#[wasm_bindgen]
pub fn series(
    color: &str,
    expand_amount: i16,
    step: f32,
) -> Result<Vec<String>, errors::ColorError> {
    let origin_color = Srgb::from_str(color)
        .map_err(|_| errors::ColorError::UnrecogniazedRGB(color.to_string()))?
        .into_format::<f32>();
    let oklch = Arc::new(Oklch::from_color(origin_color.clone()));

    let mut color_series = Vec::new();
    for s in (1..=expand_amount).rev() {
        let darkened_color = Arc::clone(&oklch).darken(s as f32 * step);
        let srgb = Srgb::from_color(darkened_color);
        color_series.push(format!("{:x}", srgb.into_format::<u8>()));
    }
    color_series.push(format!("{:x}", origin_color.into_format::<u8>()));
    for s in 1..=expand_amount {
        let lightened_color = Arc::clone(&oklch).lighten(s as f32 * step);
        let srgb = Srgb::from_color(lightened_color);
        color_series.push(format!("{:x}", srgb.into_format::<u8>()));
    }
    Ok(color_series)
}

#[wasm_bindgen]
pub fn tonal_lighten_series(
    color: &str,
    expand_amount: i16,
    step: f32,
) -> Result<Vec<String>, errors::ColorError> {
    let origin_color = Srgb::from_str(color)
        .map_err(|_| errors::ColorError::UnrecogniazedRGB(color.to_string()))?
        .into_format::<f32>();
    let hct = Cam16Jch::from_xyz(
        origin_color.into_color(),
        Parameters::default_static_wp(40.0),
    );

    let mut color_series = Vec::new();
    let mut lightness = hct.lightness;
    for _ in 1..=expand_amount {
        lightness += (100.0 - lightness) * step;
        let lightened_color = Cam16Jch::new(lightness, hct.chroma, hct.hue);
        let srgb = Srgb::from_color(lightened_color.into_xyz(Parameters::default_static_wp(40.0)));
        color_series.push(format!("{:x}", srgb.into_format::<u8>()));
    }

    Ok(color_series)
}

#[wasm_bindgen]
pub fn tonal_darken_series(
    color: &str,
    expand_amount: i16,
    step: f32,
) -> Result<Vec<String>, errors::ColorError> {
    let origin_color = Srgb::from_str(color)
        .map_err(|_| errors::ColorError::UnrecogniazedRGB(color.to_string()))?
        .into_format::<f32>();
    let hct = Cam16Jch::from_xyz(
        origin_color.into_color(),
        Parameters::default_static_wp(40.0),
    );

    let mut color_series = Vec::new();
    let mut lightness = hct.lightness;
    for _ in 1..=expand_amount {
        lightness *= 1.0 - step;
        let darkened_color = Cam16Jch::new(lightness, hct.chroma, hct.hue);
        let srgb = Srgb::from_color(darkened_color.into_xyz(Parameters::default_static_wp(40.0)));
        color_series.push(format!("{:x}", srgb.into_format::<u8>()));
    }

    Ok(color_series.into_iter().rev().collect())
}