use crate::*;
use ratatui::style::Modifier;

pub trait Theme {
    const BG0:    Color;
    const BG1:    Color;
    const BG2:    Color;
    const BG3:    Color;
    const BG4:    Color;
    const RED:    Color;
    const YELLOW: Color;
    const GREEN:  Color;

    const PLAYING: Color;
    const SEPARATOR: Color;

    fn bg_hier (focused: bool, entered: bool) -> Color {
        if focused && entered {
            Self::BG3
        } else if focused {
            Self::BG2
        } else {
            Self::BG1
        }
    }

    fn bg_hi (focused: bool, entered: bool) -> Color {
        if focused && entered {
            Self::BG2
        } else if focused {
            Self::BG1
        } else {
            Self::BG0
        }
    }

    fn bg_lo (focused: bool, entered: bool) -> Color {
        if focused && entered {
            Self::BG1
        } else if focused {
            Self::BG0
        } else {
            Color::Reset
        }
    }

    fn style_hi (focused: bool, highlight: bool) -> Style {
        if highlight && focused {
            Style::default().yellow().not_dim()
        }  else if highlight {
            Style::default().yellow().dim()
        } else {
            Style::default()
        }
    }
}

pub struct Nord;

impl Theme for Nord {
    const BG0:    Color = Color::Rgb(41, 46, 57);
    const BG1:    Color = Color::Rgb(46, 52, 64);
    const BG2:    Color = Color::Rgb(59, 66, 82);
    const BG3:    Color = Color::Rgb(67, 76, 94);
    const BG4:    Color = Color::Rgb(76, 86, 106);
    const RED:    Color = Color::Rgb(191, 97, 106);
    const YELLOW: Color = Color::Rgb(235, 203, 139);
    const GREEN:  Color = Color::Rgb(163, 190, 140);

    const PLAYING:   Color = Color::Rgb(60, 100, 50);
    const SEPARATOR: Color = Color::Rgb(0, 0, 0);
}

pub const GRAY: Style = Style {
    fg: Some(Color::Gray),
    bg: None,
    underline_color: None,
    add_modifier:    Modifier::empty(),
    sub_modifier:    Modifier::empty(),
};

pub const GRAY_NOT_DIM: Style = Style {
    fg: Some(Color::Gray),
    bg: None,
    underline_color: None,
    add_modifier:    Modifier::empty(),
    sub_modifier:    Modifier::DIM,
};

pub const DIM: Style = Style {
    fg: None,
    bg: None,
    underline_color: None,
    add_modifier:    Modifier::DIM,
    sub_modifier:    Modifier::empty(),
};

pub const GRAY_DIM: Style = Style {
    fg: Some(Color::Gray),
    bg: None,
    underline_color: None,
    add_modifier:    Modifier::DIM,
    sub_modifier:    Modifier::empty(),
};

pub const WHITE_NOT_DIM_BOLD: Style = Style {
    fg: Some(Color::White),
    bg: None,
    underline_color: None,
    add_modifier:    Modifier::BOLD,
    sub_modifier:    Modifier::DIM,
};

pub const GRAY_NOT_DIM_BOLD: Style = Style {
    fg: Some(Color::Gray),
    bg: None,
    underline_color: None,
    add_modifier:    Modifier::BOLD,
    sub_modifier:    Modifier::DIM,
};

pub const NOT_DIM: Style = Style {
    fg: None,
    bg: None,
    underline_color: None,
    add_modifier:    Modifier::empty(),
    sub_modifier:    Modifier::DIM,
};

pub const NOT_DIM_GREEN: Style = Style {
    fg: Some(Color::Green),
    bg: None,
    underline_color: None,
    add_modifier:    Modifier::BOLD,
    sub_modifier:    Modifier::DIM,
};

pub const NOT_DIM_BOLD: Style = Style {
    fg: None,
    bg: None,
    underline_color: None,
    add_modifier:    Modifier::BOLD,
    sub_modifier:    Modifier::DIM,
};