// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"

////////////////////////////////////////////////////////////////////////////////////////////////////

struct TRACEINSIGHTS_API FTimingViewLayout
{
    static constexpr float RealMinTimelineH          = 7.0f;

    static constexpr float NormalLayoutEventH        = 14.0f;
    static constexpr float NormalLayoutEventDY       = 2.0f;
    static constexpr float NormalLayoutTimelineDY    = 10.0f;
    static constexpr float NormalLayoutMinTimelineH  = 0.0f;

    static constexpr float CompactLayoutEventH       = 4.0f;
    static constexpr float CompactLayoutEventDY      = 1.0f;
    static constexpr float CompactLayoutTimelineDY   = 1.0f;
    static constexpr float CompactLayoutMinTimelineH = 0.0f;

    //////////////////////////////////////////////////

    bool bIsCompactMode;

    float EventH;              // height of a timing event, in Slate units
    float EventDY;             // vertical space between timing events in two adjacent lanes, in Slate units
    float TimelineDY;          // space at top and bottom of each track (i.e. above first lane and below last lane), in Slate units
    float MinTimelineH;        // current minimum height of a track, in Slate units
    float TargetMinTimelineH;  // targeted minimum height of a track (for animating min track height), in Slate units

    //////////////////////////////////////////////////

    float GetLaneY(int32 Depth) const
    {
        // 1.0f is for the top horizontal line of each track
        return 1.0f + TimelineDY + (EventDY + EventH) * Depth;
    }

    float ComputeTrackHeight(int32 NumLanes) const
    {
        if (NumLanes <= 0)
        {
            return MinTimelineH;
        }
        else  // if (NumLanes > 0)
        {
            // 1.0f is for horizontal line between timelines
            const float TrackHeight = 1.0f + TimelineDY + (EventH + EventDY) * NumLanes - EventDY + TimelineDY;

            if (TrackHeight < FTimingViewLayout::RealMinTimelineH)
            {
                return FTimingViewLayout::RealMinTimelineH;
            }

            return TrackHeight;
        }
    }

    void ForceNormalMode();
    void ForceCompactMode();
    bool Update();
};

////////////////////////////////////////////////////////////////////////////////////////////////////