#import "modules/std.sx";
#import "modules/math";
#import "ui/types.sx";
#import "ui/render.sx";
#import "ui/events.sx";
#import "ui/view.sx";
#import "ui/font.sx";

StatsPanel :: struct {
    delta_time: *f32;
    font_size: f32;

    PADDING      :f32: 12.0;
    LINE_SPACING :f32: 4.0;
    TITLE_SIZE   :f32: 12.0;
    VALUE_SIZE   :f32: 11.0;
    BG_COLOR     :Color: Color.rgba(30, 30, 38, 200);
    CORNER_RADIUS:f32: 12.0;
}

impl View for StatsPanel {
    size_that_fits :: (self: *StatsPanel, proposal: ProposedSize) -> Size {
        title_size := measure_text("Statistics", StatsPanel.TITLE_SIZE);
        fps_size := measure_text("FPS: 0000", StatsPanel.VALUE_SIZE);
        w := max(title_size.width, fps_size.width) + StatsPanel.PADDING * 2.0;
        h := title_size.height + StatsPanel.LINE_SPACING + fps_size.height + StatsPanel.PADDING * 2.0;
        Size.{ width = w, height = h };
    }

    layout :: (self: *StatsPanel, bounds: Frame) {}

    render :: (self: *StatsPanel, ctx: *RenderContext, frame: Frame) {
        // Background
        ctx.add_rounded_rect(frame, StatsPanel.BG_COLOR, StatsPanel.CORNER_RADIUS);

        // Title
        title_size := measure_text("Statistics", StatsPanel.TITLE_SIZE);
        title_frame := Frame.make(
            frame.origin.x + StatsPanel.PADDING,
            frame.origin.y + StatsPanel.PADDING,
            title_size.width,
            title_size.height
        );
        ctx.add_text(title_frame, "Statistics", StatsPanel.TITLE_SIZE, COLOR_WHITE);

        // FPS value
        dt := self.delta_time.*;
        fps : s64 = if dt > 0.0 then xx (1.0 / dt) else 0;
        fps_text := format("FPS: {}", fps);
        fps_size := measure_text(fps_text, StatsPanel.VALUE_SIZE);
        fps_frame := Frame.make(
            frame.origin.x + StatsPanel.PADDING,
            title_frame.max_y() + StatsPanel.LINE_SPACING,
            fps_size.width,
            fps_size.height
        );
        ctx.add_text(fps_frame, fps_text, StatsPanel.VALUE_SIZE, Color.rgba(180, 180, 190, 255));
    }

    handle_event :: (self: *StatsPanel, event: *Event, frame: Frame) -> bool {
        false;
    }
}