use egui_ratatui::RataguiBackend;
use ratatui::Terminal;
use soft_ratatui::embedded_graphics_unicodefonts::{
    mono_10x20_atlas, mono_6x13_atlas, mono_6x13_bold_atlas, mono_6x13_italic_atlas,
    mono_7x13_atlas, mono_7x13_bold_atlas, mono_7x13_italic_atlas, mono_8x13_atlas,
    mono_8x13_bold_atlas, mono_8x13_italic_atlas, mono_9x15_atlas, mono_9x15_bold_atlas,
    mono_9x18_atlas, mono_9x18_bold_atlas,
};
use soft_ratatui::{EmbeddedGraphics, SoftBackend};

use crate::block_renderer::BlockCharBackend;

pub type TerminalType = Terminal<RataguiBackend<BlockCharBackend>>;

#[derive(Clone, Copy, PartialEq)]
pub enum FontChoice {
    Size6x13,
    Size7x13,
    Size8x13,
    Size9x15,
    Size9x18,
    Size10x20,
}

impl FontChoice {
    pub fn from_setting(s: &str) -> Self {
        match s {
            "6x13" => Self::Size6x13,
            "7x13" => Self::Size7x13,
            "9x15" => Self::Size9x15,
            "9x18" => Self::Size9x18,
            "10x20" => Self::Size10x20,
            _ => Self::Size8x13,
        }
    }

    pub fn to_setting(self) -> &'static str {
        match self {
            Self::Size6x13 => "6x13",
            Self::Size7x13 => "7x13",
            Self::Size8x13 => "8x13",
            Self::Size9x15 => "9x15",
            Self::Size9x18 => "9x18",
            Self::Size10x20 => "10x20",
        }
    }

    pub fn label(self) -> &'static str {
        match self {
            Self::Size6x13 => "6x13 (Compact)",
            Self::Size7x13 => "7x13",
            Self::Size8x13 => "8x13 (Default)",
            Self::Size9x15 => "9x15",
            Self::Size9x18 => "9x18",
            Self::Size10x20 => "10x20 (Large)",
        }
    }

    pub const ALL: [Self; 6] = [
        Self::Size6x13,
        Self::Size7x13,
        Self::Size8x13,
        Self::Size9x15,
        Self::Size9x18,
        Self::Size10x20,
    ];
}

pub fn create_terminal(font: FontChoice) -> TerminalType {
    let (regular, bold, italic) = match font {
        FontChoice::Size6x13 => (
            mono_6x13_atlas(),
            Some(mono_6x13_bold_atlas()),
            Some(mono_6x13_italic_atlas()),
        ),
        FontChoice::Size7x13 => (
            mono_7x13_atlas(),
            Some(mono_7x13_bold_atlas()),
            Some(mono_7x13_italic_atlas()),
        ),
        FontChoice::Size8x13 => (
            mono_8x13_atlas(),
            Some(mono_8x13_bold_atlas()),
            Some(mono_8x13_italic_atlas()),
        ),
        FontChoice::Size9x15 => (mono_9x15_atlas(), Some(mono_9x15_bold_atlas()), None),
        FontChoice::Size9x18 => (mono_9x18_atlas(), Some(mono_9x18_bold_atlas()), None),
        FontChoice::Size10x20 => (mono_10x20_atlas(), None, None),
    };

    // SoftBackend fields are copied individually to wrap raster_backend in BlockCharBackend.
    // If soft_ratatui changes its field layout, this will fail to compile — that's intentional.
    let eg = SoftBackend::<EmbeddedGraphics>::new(80, 24, regular, bold, italic);
    let soft = SoftBackend {
        buffer: eg.buffer,
        cursor: eg.cursor,
        cursor_pos: eg.cursor_pos,
        char_width: eg.char_width,
        char_height: eg.char_height,
        blink_counter: eg.blink_counter,
        blinking_fast: eg.blinking_fast,
        blinking_slow: eg.blinking_slow,
        rgb_pixmap: eg.rgb_pixmap,
        always_redraw_list: eg.always_redraw_list,
        raster_backend: BlockCharBackend {
            inner: eg.raster_backend,
        },
    };
    Terminal::new(RataguiBackend::new("cagire", soft)).expect("terminal")
}