use crate::common::Rect;
use crate::engine_constants::EngineConstants;
use crate::framework::context::Context;
use crate::framework::error::GameResult;
use crate::framework::graphics::screen_insets_scaled;
use crate::texture_set::TextureSet;

#[derive(Copy, Clone, PartialEq, Eq)]
pub enum TouchControlType {
    None,
    Dialog,
    Controls,
}

#[derive(Copy, Clone)]
pub struct TouchPoint {
    pub id: u64,
    pub touch_id: u64,
    pub position: (f64, f64),
    pub last_position: (f64, f64),
}

pub struct TouchControls {
    pub control_type: TouchControlType,
    pub points: Vec<TouchPoint>,
    pub interact_icon: bool,
    pub touch_id_counter: u64,
    pub clicks: Vec<TouchPoint>,
}

impl TouchControls {
    pub fn new() -> TouchControls {
        TouchControls {
            control_type: TouchControlType::None,
            points: Vec::with_capacity(8),
            interact_icon: false,
            touch_id_counter: 0,
            clicks: Vec::with_capacity(8),
        }
    }

    pub fn point_in(&self, bounds: Rect) -> Option<u64> {
        for point in self.points.iter() {
            if (point.position.0 as isize) > bounds.left
                && (point.position.0 as isize) < bounds.right
                && (point.position.1 as isize) > bounds.top
                && (point.position.1 as isize) < bounds.bottom
            {
                return Some(point.touch_id);
            }
        }

        None
    }

    pub fn consume_click_in(&mut self, bounds: Rect) -> bool {
        self.clicks.retain(|p| p.touch_id != 0);

        for point in self.clicks.iter_mut() {
            if (point.position.0 as isize) > bounds.left
                && (point.position.0 as isize) < bounds.right
                && (point.position.1 as isize) > bounds.top
                && (point.position.1 as isize) < bounds.bottom
            {
                point.touch_id = 0;

                return true;
            }
        }

        false
    }

    pub fn draw(
        &self,
        canvas_size: (f32, f32),
        scale: f32,
        constants: &EngineConstants,
        texture_set: &mut TextureSet,
        ctx: &mut Context,
    ) -> GameResult {
        if self.control_type == TouchControlType::Controls {
            let batch = texture_set.get_or_load_batch(ctx, constants, "builtin/touch")?;
            let color = (255, 255, 255, 160);

            let (left, _, right, bottom) = screen_insets_scaled(ctx, scale);

            for x in 0..3 {
                for y in 0..3 {
                    let mut icon_x = x;
                    let icon_y = y;

                    if self.interact_icon && x == 1 && y == 2 {
                        icon_x = 3;
                    }

                    batch.add_rect_tinted(
                        4.0 + 48.0 * x as f32 + 8.0 + left,
                        (canvas_size.1 - 4.0 - 48.0 * 3.0) + 48.0 * y as f32 + 8.0 - bottom,
                        color,
                        &Rect::new_size(icon_x * 32, icon_y * 32, 32, 32),
                    );
                }
            }

            batch.add_rect_tinted(
                canvas_size.0 - (4.0 + 48.0) + 8.0 - right,
                canvas_size.1 - (4.0 + 48.0) + 8.0 - bottom,
                color,
                &Rect::new_size(3 * 32, 32, 32, 32),
            );

            batch.add_rect_tinted(
                canvas_size.0 - (4.0 + 48.0) + 8.0 - right,
                canvas_size.1 - (4.0 + 48.0) * 2.0 + 8.0 - bottom,
                color,
                &Rect::new_size(3 * 32, 0, 32, 32),
            );

            batch.draw(ctx)?;
        }

        Ok(())
    }
}