//! Gameboard view.

use graphics::character::CharacterCache;
use graphics::types::Color;
use graphics::{Context, Graphics};

use crate::gameboard_controller::GameboardController;

pub struct GameboardViewSettings {
    pub position: [f64; 2],
    pub size: f64,
    pub background_color: Color,
    pub border_color: Color,
    pub board_edge_color: Color,
    pub section_edge_color: Color,
    pub cell_edge_color: Color,
    pub board_edge_radius: f64,
    pub section_edge_radius: f64,
    pub cell_edge_radius: f64,
    pub selected_cell_background_color: Color,
    pub text_color: Color,
    pub loaded_cell_background_color: Color,
    pub invalid_cell_background_color: Color,
    pub invalid_selected_cell_background_color: Color,
    pub completed_background_color: Color,
}

impl GameboardViewSettings {
    pub fn new() -> GameboardViewSettings {
        GameboardViewSettings {
            position: [10.0; 2],
            size: 400.0,
            background_color: [0.8, 0.8, 1.0, 1.0],
            border_color: [0.0, 0.0, 0.2, 1.0],
            board_edge_color: [0.0, 0.0, 0.2, 1.0],
            section_edge_color: [0.0, 0.0, 0.2, 1.0],
            cell_edge_color: [0.0, 0.0, 0.2, 1.0],
            board_edge_radius: 3.0,
            section_edge_radius: 2.0,
            cell_edge_radius: 1.0,
            selected_cell_background_color: [0.9, 0.9, 1.0, 1.0],
            text_color: [0.0, 0.0, 0.1, 1.0],
            loaded_cell_background_color: [1.0, 1.0, 1.0, 1.0],
            invalid_cell_background_color: [1.0, 0.0, 0.0, 1.0],
            invalid_selected_cell_background_color: [1.0, 0.0, 0.5, 1.0],
            completed_background_color: [0.0, 1.0, 0.0, 1.0],
        }
    }
}

pub struct GameboardView {
    pub settings: GameboardViewSettings,
}

impl GameboardView {
    pub fn new(settings: GameboardViewSettings) -> GameboardView {
        GameboardView { settings: settings }
    }

    pub fn draw<G: Graphics, C>(
        &self,
        controller: &GameboardController,
        glyphs: &mut C,
        c: &Context,
        g: &mut G,
    ) where
        C: CharacterCache<Texture = G::Texture>,
    {
        use graphics::{Image, Line, Rectangle, Transformed};

        let ref settings = self.settings;
        let board_rect = [
            settings.position[0],
            settings.position[1],
            settings.size,
            settings.size,
        ];

        if controller.gameboard.completed {
            Rectangle::new(settings.completed_background_color).draw(
                board_rect,
                &c.draw_state,
                c.transform,
                g,
            );
        } else {
            Rectangle::new(settings.background_color).draw(
                board_rect,
                &c.draw_state,
                c.transform,
                g,
            );

            for i in 0..9 {
                for j in 0..9 {
                    if controller.gameboard.cells[i][j].loaded {
                        color_cell(
                            settings,
                            [j, i],
                            settings.loaded_cell_background_color,
                            c,
                            g,
                        );
                    } else if controller.gameboard.cells[i][j].invalid {
                        color_cell(
                            settings,
                            [j, i],
                            settings.invalid_cell_background_color,
                            c,
                            g,
                        );
                    }
                }
            }

            if let Some(ind) = controller.selected_cell {
                let cell = controller.gameboard.cells[ind[1]][ind[0]];
                let color = if !cell.loaded {
                    if !cell.invalid {
                        settings.selected_cell_background_color
                    } else {
                        settings.invalid_selected_cell_background_color
                    }
                } else {
                    settings.loaded_cell_background_color
                };
                color_cell(settings, ind, color, c, g);
            }
        }

        let text_image = Image::new_color(settings.text_color);
        let cell_size = settings.size / 9.0;

        for j in 0..9 {
            for i in 0..9 {
                if let Some(ch) = controller.gameboard.char([i, j]) {
                    let pos = [
                        settings.position[0] + i as f64 * cell_size + 15.0,
                        settings.position[1] + j as f64 * cell_size + 34.0,
                    ];

                    if let Ok(character) = glyphs.character(34, ch) {
                        let ch_x = pos[0] + character.left();
                        let ch_y = pos[1] - character.top();
                        let text_image = text_image.src_rect([
                            character.atlas_offset[0],
                            character.atlas_offset[1],
                            character.atlas_size[0],
                            character.atlas_size[1],
                        ]);
                        text_image.draw(
                            character.texture,
                            &c.draw_state,
                            c.transform.trans(ch_x, ch_y),
                            g,
                        );
                    }
                }
            }
        }

        let cell_edge = Line::new(settings.cell_edge_color, settings.cell_edge_radius);
        let section_edge = Line::new(settings.section_edge_color, settings.section_edge_radius);

        for i in 0..9 {
            let x = settings.position[0] + i as f64 / 9.0 * settings.size;
            let y = settings.position[1] + i as f64 / 9.0 * settings.size;
            let x2 = settings.position[0] + settings.size;
            let y2 = settings.position[1] + settings.size;

            let vline = [x, settings.position[1], x, y2];
            let hline = [settings.position[0], y, x2, y];

            if (i % 3) == 0 {
                section_edge.draw(vline, &c.draw_state, c.transform, g);
                section_edge.draw(hline, &c.draw_state, c.transform, g);
            } else {
                cell_edge.draw(vline, &c.draw_state, c.transform, g);
                cell_edge.draw(hline, &c.draw_state, c.transform, g);
            }
        }

        Rectangle::new_border(settings.board_edge_color, settings.board_edge_radius).draw(
            board_rect,
            &c.draw_state,
            c.transform,
            g,
        );
    }
}

fn color_cell<G: Graphics>(
    settings: &GameboardViewSettings,
    ind: [usize; 2],
    color: [f32; 4],
    c: &Context,
    g: &mut G,
) {
    use graphics::Rectangle;

    let cell_size = settings.size / 9.0;
    let pos = [ind[0] as f64 * cell_size, ind[1] as f64 * cell_size];
    let cell_rect = [
        settings.position[0] + pos[0],
        settings.position[1] + pos[1],
        cell_size,
        cell_size,
    ];
    Rectangle::new(color).draw(cell_rect, &c.draw_state, c.transform, g);
}