use super::constant;
use crate::{
    error::Error,
    time::Duration,
    trezorhal::{display, qr, time},
};

use super::geometry::{Offset, Point, Rect};

pub fn backlight() -> i32 {
    display::backlight(-1)
}

pub fn set_backlight(val: i32) {
    display::backlight(val);
}

pub fn fade_backlight(target: i32) {
    const BACKLIGHT_DELAY: Duration = Duration::from_millis(14);
    const BACKLIGHT_STEP: usize = 15;

    let current = backlight();
    if current < target {
        for val in (current..target).step_by(BACKLIGHT_STEP) {
            set_backlight(val);
            time::sleep(BACKLIGHT_DELAY);
        }
    } else {
        for val in (target..current).rev().step_by(BACKLIGHT_STEP) {
            set_backlight(val);
            time::sleep(BACKLIGHT_DELAY);
        }
    }
}

pub fn rect_fill(r: Rect, fg_color: Color) {
    display::bar(r.x0, r.y0, r.width(), r.height(), fg_color.into());
}

pub fn rect_stroke(r: Rect, fg_color: Color) {
    display::bar(r.x0, r.y0, r.width(), 1, fg_color.into());
    display::bar(r.x0, r.y0 + r.height() - 1, r.width(), 1, fg_color.into());
    display::bar(r.x0, r.y0, 1, r.height(), fg_color.into());
    display::bar(r.x0 + r.width() - 1, r.y0, 1, r.height(), fg_color.into());
}

pub fn rect_fill_rounded(r: Rect, fg_color: Color, bg_color: Color, radius: u8) {
    assert!([2, 4, 8, 16].iter().any(|allowed| radius == *allowed));
    display::bar_radius(
        r.x0,
        r.y0,
        r.width(),
        r.height(),
        fg_color.into(),
        bg_color.into(),
        radius,
    );
}

/// NOTE: Cannot start at odd x-coordinate. In this case icon is shifted 1px
/// left.
pub fn icon_top_left(top_left: Point, data: &[u8], fg_color: Color, bg_color: Color) {
    let toif_info = display::toif_info(data).unwrap();
    assert!(toif_info.grayscale);
    display::icon(
        top_left.x,
        top_left.y,
        toif_info.width.into(),
        toif_info.height.into(),
        &data[12..], // Skip TOIF header.
        fg_color.into(),
        bg_color.into(),
    );
}

pub fn icon(center: Point, data: &[u8], fg_color: Color, bg_color: Color) {
    let toif_info = display::toif_info(data).unwrap();
    assert!(toif_info.grayscale);

    let r = Rect::from_center_and_size(
        center,
        Offset::new(toif_info.width.into(), toif_info.height.into()),
    );
    display::icon(
        r.x0,
        r.y0,
        r.width(),
        r.height(),
        &data[12..], // Skip TOIF header.
        fg_color.into(),
        bg_color.into(),
    );
}

pub fn image(center: Point, data: &[u8]) {
    let toif_info = display::toif_info(data).unwrap();
    assert!(!toif_info.grayscale);

    let r = Rect::from_center_and_size(
        center,
        Offset::new(toif_info.width.into(), toif_info.height.into()),
    );
    display::image(
        r.x0,
        r.y0,
        r.width(),
        r.height(),
        &data[12..], // Skip TOIF header.
    );
}

pub fn toif_info(data: &[u8]) -> Option<(Offset, bool)> {
    if let Ok(info) = display::toif_info(data) {
        Some((
            Offset::new(info.width.into(), info.height.into()),
            info.grayscale,
        ))
    } else {
        None
    }
}

// Used on T1 only.
pub fn rect_fill_rounded1(r: Rect, fg_color: Color, bg_color: Color) {
    display::bar(r.x0, r.y0, r.width(), r.height(), fg_color.into());
    let corners = [
        r.top_left(),
        r.top_right() - Offset::x(1),
        r.bottom_right() - Offset::uniform(1),
        r.bottom_left() - Offset::y(1),
    ];
    for p in corners.iter() {
        display::bar(p.x, p.y, 1, 1, bg_color.into());
    }
}

// Used on T1 only.
pub fn dotted_line(start: Point, width: i32, color: Color) {
    for x in (start.x..width).step_by(2) {
        display::bar(x, start.y, 1, 1, color.into());
    }
}

pub const LOADER_MIN: u16 = 0;
pub const LOADER_MAX: u16 = 1000;

pub fn loader(
    progress: u16,
    y_offset: i32,
    fg_color: Color,
    bg_color: Color,
    icon: Option<(&[u8], Color)>,
) {
    display::loader(
        progress,
        false,
        y_offset,
        fg_color.into(),
        bg_color.into(),
        icon.map(|i| i.0),
        icon.map(|i| i.1.into()).unwrap_or(0),
    );
}

pub fn loader_indeterminate(
    progress: u16,
    y_offset: i32,
    fg_color: Color,
    bg_color: Color,
    icon: Option<(&[u8], Color)>,
) {
    display::loader(
        progress,
        true,
        y_offset,
        fg_color.into(),
        bg_color.into(),
        icon.map(|i| i.0),
        icon.map(|i| i.1.into()).unwrap_or(0),
    );
}

pub fn qrcode(center: Point, data: &str, max_size: u32, case_sensitive: bool) -> Result<(), Error> {
    qr::render_qrcode(center.x, center.y, data, max_size, case_sensitive)
}

pub fn text(baseline: Point, text: &str, font: Font, fg_color: Color, bg_color: Color) {
    display::text(
        baseline.x,
        baseline.y,
        text,
        font.0,
        fg_color.into(),
        bg_color.into(),
    );
}

pub fn text_center(baseline: Point, text: &str, font: Font, fg_color: Color, bg_color: Color) {
    let w = font.text_width(text);
    display::text(
        baseline.x - w / 2,
        baseline.y,
        text,
        font.0,
        fg_color.into(),
        bg_color.into(),
    );
}

pub fn text_right(baseline: Point, text: &str, font: Font, fg_color: Color, bg_color: Color) {
    let w = font.text_width(text);
    display::text(
        baseline.x - w,
        baseline.y,
        text,
        font.0,
        fg_color.into(),
        bg_color.into(),
    );
}

#[inline(always)]
pub fn pixeldata(color: Color) {
    display::pixeldata(color.into());
}

pub fn pixeldata_dirty() {
    display::pixeldata_dirty();
}

pub fn set_window(window: Rect) {
    display::set_window(
        window.x0 as u16,
        window.y0 as u16,
        window.x1 as u16 - 1,
        window.y1 as u16 - 1,
    );
}

#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Font(i32);

impl Font {
    pub const fn new(id: i32) -> Self {
        Self(id)
    }

    pub fn text_width(self, text: &str) -> i32 {
        display::text_width(text, self.0)
    }

    pub fn char_width(self, ch: char) -> i32 {
        display::char_width(ch, self.0)
    }

    pub fn text_height(self) -> i32 {
        display::text_height(self.0)
    }

    pub fn line_height(self) -> i32 {
        constant::LINE_SPACE + self.text_height()
    }
}

#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Color(u16);

impl Color {
    pub const fn from_u16(val: u16) -> Self {
        Self(val)
    }

    pub const fn rgb(r: u8, g: u8, b: u8) -> Self {
        let r = (r as u16 & 0xF8) << 8;
        let g = (g as u16 & 0xFC) << 3;
        let b = (b as u16 & 0xF8) >> 3;
        Self(r | g | b)
    }

    pub const fn r(self) -> u8 {
        (self.0 >> 8) as u8 & 0xF8
    }

    pub const fn g(self) -> u8 {
        (self.0 >> 3) as u8 & 0xFC
    }

    pub const fn b(self) -> u8 {
        (self.0 << 3) as u8 & 0xF8
    }

    pub fn to_u16(self) -> u16 {
        self.0
    }

    pub fn negate(self) -> Self {
        Self(!self.0)
    }
}

impl From<u16> for Color {
    fn from(val: u16) -> Self {
        Self(val)
    }
}

impl From<Color> for u16 {
    fn from(val: Color) -> Self {
        val.to_u16()
    }
}