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use core::cmp::Ordering::{Greater, Less};
use std::ops::{Add, Sub};

use image::{
    buffer::ConvertBuffer, DynamicImage, GenericImage, GenericImageView, ImageBuffer, Luma, Rgb,
    Rgba,
};
use imageproc::definitions::Clamp;

use crate::{
    file_util::PixelEffect,
    types::{ResultImage, ViewImage},
};
use rvimage_domain::{rverr, to_rv, ShapeI};

pub fn read_image(path: &str) -> ResultImage {
    image::io::Reader::open(path)
        .map_err(to_rv)?
        .with_guessed_format()
        .map_err(to_rv)?
        .decode()
        .map_err(|e| rverr!("could not decode image {:?}. {:?}", path, e))
}

pub fn clipped_add<T>(x1: T, x2: T, clip_value: T) -> T
where
    T: Add<Output = T> + Sub<Output = T> + PartialOrd + Copy,
{
    if x1 >= clip_value || x2 >= clip_value || clip_value - x1 < x2 {
        clip_value
    } else {
        x1 + x2
    }
}

pub fn apply_to_matched_image<FnRgb8, FnRgba8, FnLuma8, FnRgb32F, T>(
    im_d: &DynamicImage,
    fn_rgb8: FnRgb8,
    fn_rgba8: FnRgba8,
    fn_luma8: FnLuma8,
    fn_rgb32f: FnRgb32F,
) -> T
where
    FnRgb8: Fn(&ImageBuffer<Rgb<u8>, Vec<u8>>) -> T,
    FnRgba8: Fn(&ImageBuffer<Rgba<u8>, Vec<u8>>) -> T,
    FnLuma8: Fn(&ImageBuffer<Luma<u8>, Vec<u8>>) -> T,
    FnRgb32F: Fn(&ImageBuffer<Rgb<f32>, Vec<f32>>) -> T,
{
    match im_d {
        DynamicImage::ImageRgb8(im) => fn_rgb8(im),
        DynamicImage::ImageRgba8(im) => fn_rgba8(im),
        DynamicImage::ImageLuma8(im) => fn_luma8(im),
        DynamicImage::ImageRgb32F(im) => fn_rgb32f(im),
        _ => panic!("Unsupported image type. {:?}", im_d.color()),
    }
}

pub fn orig_to_0_255(
    im_orig: &DynamicImage,
    im_mask: &Option<ImageBuffer<Luma<u8>, Vec<u8>>>,
) -> ViewImage {
    let fn_rgb32f = |im: &ImageBuffer<Rgb<f32>, Vec<f32>>| {
        let mut im = im.clone();
        let max_val = im
            .as_raw()
            .iter()
            .copied()
            .max_by(|a, b| {
                if a.is_nan() {
                    Greater
                } else if b.is_nan() {
                    Less
                } else {
                    a.partial_cmp(b).unwrap()
                }
            })
            .expect("an image should have a maximum value");
        if max_val <= 1.0 {
            for y in 0..im.height() {
                for x in 0..im.width() {
                    let p = im.get_pixel_mut(x, y);
                    p.0 = [p.0[0] * 255.0, p.0[1] * 255.0, p.0[2] * 255.0];
                }
            }
        } else if max_val > 255.0 {
            for y in 0..im.height() {
                for x in 0..im.width() {
                    let is_pixel_relevant = if let Some(im_mask) = im_mask {
                        im_mask.get_pixel(x, y)[0] > 0
                    } else {
                        true
                    };
                    let p = im.get_pixel_mut(x, y);
                    p.0 = if is_pixel_relevant {
                        [
                            p.0[0] / max_val * 255.0,
                            p.0[1] / max_val * 255.0,
                            p.0[2] / max_val * 255.0,
                        ]
                    } else {
                        [0.0, 0.0, 0.0]
                    };
                }
            }
        }
        im.convert()
    };
    apply_to_matched_image(
        im_orig,
        |im| im.clone(),
        |im| im.convert(),
        |im| im.convert(),
        fn_rgb32f,
    )
}
pub fn effect_per_pixel<F: PixelEffect>(shape: ShapeI, mut f: F) {
    for y in 0..shape.h {
        for x in 0..shape.w {
            f(x, y);
        }
    }
}

pub fn to_i64(x: (u32, u32)) -> (i64, i64) {
    ((x.0 as i64), (x.1 as i64))
}
pub fn to_u32(x: (usize, usize)) -> (u32, u32) {
    ((x.0 as u32), (x.1 as u32))
}

pub fn to_01(x: u8) -> f32 {
    x as f32 / 255.0
}

pub fn apply_alpha(pixel_rgb: &[u8; 3], color: &[u8; 3], alpha: u8) -> Rgb<u8> {
    let alpha_amount = to_01(alpha);
    let apply_alpha_scalar = |x_anno, x_res| {
        ((to_01(x_anno) * alpha_amount + (1.0 - alpha_amount) * to_01(x_res)) * 255.0) as u8
    };
    let [r_pixel, g_pixel, b_pixel] = pixel_rgb;
    let [r_clr, g_clr, b_clr] = color;
    Rgb([
        apply_alpha_scalar(*r_pixel, *r_clr),
        apply_alpha_scalar(*g_pixel, *g_clr),
        apply_alpha_scalar(*b_pixel, *b_clr),
    ])
}

pub fn draw_on_image<I: GenericImage, F: Fn(&I::Pixel) -> I::Pixel>(
    mut im: I,
    mut boundary_points: impl Iterator<Item = (u32, u32)>,
    inner_points: impl Iterator<Item = (u32, u32)>,
    color: &I::Pixel,
    fn_inner_color: F,
) -> I
where
    <<I as GenericImageView>::Pixel as image::Pixel>::Subpixel: Clamp<f32>,
    f32: conv::ValueFrom<<<I as GenericImageView>::Pixel as image::Pixel>::Subpixel>,
{
    if let Some(first) = boundary_points.next() {
        for inner_point in inner_points {
            let (x, y) = inner_point;
            let rgb = im.get_pixel(x, y);
            im.put_pixel(x, y, fn_inner_color(&rgb));
        }
        let first = (first.0 as i32, first.1 as i32);
        let mut prev = (first.0, first.1);
        let blend = imageproc::pixelops::interpolate::<I::Pixel>;
        for bp in boundary_points {
            let start = prev;
            let end = (bp.0 as i32, bp.1 as i32);
            imageproc::drawing::draw_antialiased_line_segment_mut(
                &mut im, start, end, *color, blend,
            );
            prev = end;
        }
    }
    im
}