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// Pushrod Widget Library
// Progress Widget
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::render::callbacks::CallbackRegistry;
use crate::render::widget::*;
use crate::render::widget_cache::WidgetContainer;
use crate::render::widget_config::*;
use crate::render::Points;

use sdl2::pixels::Color;
use sdl2::rect::Rect;
use sdl2::video::Window;

use sdl2::render::Canvas;
use std::collections::HashMap;

/// This is the storage object for the `ProgressWidget`.  It stores the config, properties, callback registry,
/// the base widget, and progress from 0 to 100.
pub struct ProgressWidget {
    config: WidgetConfig,
    system_properties: HashMap<i32, String>,
    callback_registry: CallbackRegistry,
    base_widget: BaseWidget,
}

/// Creates a new `ProgressWidget`, which draws a progress bar inside a `BaseWidget`.
impl ProgressWidget {
    /// Creates a new instance of the `ProgressWidget` object.  It draws a progress bar-style
    /// `Widget` given the `xywh` coordinates, and the `percentage` of fill from 0-100.  The
    /// base color and border colors are set to white and black, respectively.  Use the
    /// `COLOR_SECONDARY` setting to change the color of the fill for the progress bar.
    pub fn new(x: i32, y: i32, w: u32, h: u32) -> Self {
        let mut base_widget = BaseWidget::new(x, y, w, h);

        base_widget
            .get_config()
            .set_color(CONFIG_COLOR_BASE, Color::RGB(255, 255, 255));

        base_widget
            .get_config()
            .set_color(CONFIG_COLOR_BORDER, Color::RGB(0, 0, 0));

        base_widget.get_config().set_numeric(CONFIG_BORDER_WIDTH, 1);

        Self {
            config: WidgetConfig::new(x, y, w, h),
            system_properties: HashMap::new(),
            callback_registry: CallbackRegistry::new(),
            base_widget,
        }
    }
}

/// This is the `Widget` implementation of the `ProgressWidget`.  It contains a `BaseWidget` within
/// its bounds to draw the base background, then draws the progress fill over the top.
impl Widget for ProgressWidget {
    fn draw(&mut self, c: &mut Canvas<Window>) {
        self.base_widget.draw(c);

        let base_color = self.get_color(CONFIG_COLOR_SECONDARY);
        let progress = (f64::from(self.get_size(CONFIG_SIZE)[0])
            * (f64::from(self.get_numeric(CONFIG_PROGRESS)) / 100.0)) as u32;

        c.set_draw_color(base_color);
        c.fill_rect(Rect::new(
            self.config.to_x(1),
            self.config.to_y(1),
            progress,
            self.get_size(CONFIG_SIZE)[1] - 2,
        ))
        .unwrap();
    }

    /// Responds to a screen redraw only if the `CONFIG_PROGRESS` key was changed.
    fn on_config_changed(&mut self, _k: u8, _v: Config) {
        if _k == CONFIG_PROGRESS {
            self.get_config().set_invalidate(true);
        }
    }

    default_widget_properties!();
    default_widget_callbacks!();
}