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//! User interface module.

use crate::console::Color;
use crate::constants;
use crate::coord::Coord;
use crate::database::Database;
use crate::defs::big_to_usize;
use crate::dungeon::Dungeon;
use crate::game_data::GameData;
use crate::util::rectangle::Rectangle;
use crate::{GameResult, CONSOLE, GAMEDATA};
use std::cell::Cell;
use std::str::FromStr;

pub fn calc_game_view() -> Rectangle {
    let game_data = GAMEDATA.read().unwrap();

    let settings = game_data.ui_settings;
    let game_width = settings.game_width;
    let game_height = settings.game_height;

    let player = game_data.player().coord();

    let width_radius = (game_width / 2) as i32;
    let height_radius = (game_height / 2) as i32;

    let view_left = player.x - width_radius;
    let view_top = player.y - height_radius;
    let view_right = player.x + width_radius;
    let view_bottom = player.y + height_radius;

    Rectangle::new(view_left, view_top, view_right, view_bottom)
}

#[derive(Copy, Clone, Debug)]
pub struct UiSettings {
    pub game_width: usize,
    pub game_height: usize,
}

impl UiSettings {
    pub fn new(data: &Database) -> GameResult<UiSettings> {
        // Load all data from the database.

        let game_width = big_to_usize(data.get_int("game_width")?)?;
        let game_height = big_to_usize(data.get_int("game_height")?)?;

        // Create the struct.

        Ok(UiSettings {
            game_width,
            game_height,
        })
    }
}

/// Trait for any object that can be drawn.
pub trait Draw {
    fn draw_c(&self) -> char;
    fn draw_color(&self) -> Color;
}

pub fn draw_all(dungeon: &Dungeon) {
    CONSOLE.lock().unwrap().clear();

    draw_game(dungeon);

    CONSOLE.lock().unwrap().flush();
}

pub fn draw_game(dungeon: &Dungeon) {
    let mut console = CONSOLE.lock().unwrap();

    let view = calc_game_view();

    let dungeon_width = dungeon.width() as i32;
    let dungeon_height = dungeon.height() as i32;

    for x in 0.max(view.left)..dungeon_width.min(view.right + 1) {
        for y in 0.max(view.top)..dungeon_height.min(view.bottom + 1) {
            debug_assert!(x >= 0);
            debug_assert!(y >= 0);

            let coord = Coord::new(x, y);
            let tile = &dungeon[coord];

            let draw_x = x - view.left;
            let draw_y = y - view.top;

            let mut draw_c;
            let mut draw_color;

            if !dungeon.visible(coord) {
                // Tile not currently visible.

                match tile.last_seen.get() {
                    Some((c, color)) => {
                        draw_c = c;

                        // Darken the last seen tile color.
                        let factor: f32 = 0.5;
                        draw_color = Color {
                            r: (f32::from(color.r) * factor) as u8,
                            g: (f32::from(color.g) * factor) as u8,
                            b: (f32::from(color.b) * factor) as u8,
                        };
                    }
                    None => continue,
                }
            } else {
                // Tile currently visible.

                // Common case is that we draw a tile, so initialize with tile's values.
                draw_c = tile.info.draw_c();
                draw_color = tile.info.draw_color();
                let mut foreground_drawn = false;

                // Draw actor.
                if let Some(ref actor) = tile.actor {
                    if actor.visible() {
                        draw_c = actor.draw_c();
                        draw_color = actor.draw_color();
                        foreground_drawn = true;
                    }
                }

                // Draw item stash.
                if let Some(ref stash) = tile.item_stash {
                    if !foreground_drawn {
                        draw_c = stash.draw_c();
                        draw_color = stash.draw_color();
                        foreground_drawn = true;
                    }
                }

                // Draw object.
                if let Some(ref object) = tile.object {
                    let object = object.inner.lock().unwrap();
                    if !foreground_drawn && object.visible() {
                        draw_c = object.draw_c();
                        draw_color = object.draw_color();
                    }
                }

                tile.last_seen.set(Some((draw_c, draw_color)));
            }

            console.draw_char(draw_x, draw_y, draw_c, draw_color);
        }
    }
}