/*++
Copyright (c) Microsoft Corporation
Licensed under the MIT license.

Module Name:
- Renderer.hpp

Abstract:
- This is the definition of our renderer.
- It provides interfaces for the console application to notify when various portions of the console state have changed and need to be redrawn.
- It requires a data interface to fetch relevant console structures required for drawing and a drawing engine target for output.

Author(s):
- Michael Niksa (MiNiksa) 17-Nov-2015
--*/

#pragma once

#include "../inc/IRenderer.hpp"
#include "../inc/IRenderEngine.hpp"
#include "../inc/IRenderData.hpp"

#include "thread.hpp"

#include "../../buffer/out/textBuffer.hpp"
#include "../../buffer/out/CharRow.hpp"

namespace Microsoft::Console::Render
{
    class Renderer sealed : public IRenderer
    {
    public:
        Renderer(IRenderData* pData,
                 _In_reads_(cEngines) IRenderEngine** const pEngine,
                 const size_t cEngines,
                 std::unique_ptr<IRenderThread> thread);

        [[nodiscard]] static HRESULT s_CreateInstance(IRenderData* pData,
                                                      _In_reads_(cEngines) IRenderEngine** const rgpEngines,
                                                      const size_t cEngines,
                                                      _Outptr_result_nullonfailure_ Renderer** const ppRenderer);

        [[nodiscard]] static HRESULT s_CreateInstance(IRenderData* pData,
                                                      _Outptr_result_nullonfailure_ Renderer** const ppRenderer);

        virtual ~Renderer() override;

        [[nodiscard]] HRESULT PaintFrame();

        void TriggerSystemRedraw(const RECT* const prcDirtyClient) override;
        void TriggerRedraw(const Microsoft::Console::Types::Viewport& region) override;
        void TriggerRedraw(const COORD* const pcoord) override;
        void TriggerRedrawCursor(const COORD* const pcoord) override;
        void TriggerRedrawAll() override;
        void TriggerTeardown() override;

        void TriggerSelection() override;
        void TriggerScroll() override;
        void TriggerScroll(const COORD* const pcoordDelta) override;

        void TriggerCircling() override;
        void TriggerTitleChange() override;

        void TriggerFontChange(const int iDpi,
                               const FontInfoDesired& FontInfoDesired,
                               _Out_ FontInfo& FontInfo) override;

        [[nodiscard]] HRESULT GetProposedFont(const int iDpi,
                                              const FontInfoDesired& FontInfoDesired,
                                              _Out_ FontInfo& FontInfo) override;

        bool IsGlyphWideByFont(const std::wstring_view glyph) override;

        void EnablePainting() override;
        void WaitForPaintCompletionAndDisable(const DWORD dwTimeoutMs) override;
        void WaitUntilCanRender() override;

        void AddRenderEngine(_In_ IRenderEngine* const pEngine) override;

        void SetRendererEnteredErrorStateCallback(std::function<void()> pfn);
        void ResetErrorStateAndResume();

        void UpdateLastHoveredInterval(const std::optional<interval_tree::IntervalTree<til::point, size_t>::interval>& newInterval);

    private:
        std::deque<IRenderEngine*> _rgpEngines;

        IRenderData* _pData; // Non-ownership pointer

        std::unique_ptr<IRenderThread> _pThread;
        bool _destructing = false;

        std::optional<interval_tree::IntervalTree<til::point, size_t>::interval> _hoveredInterval;

        void _NotifyPaintFrame();

        [[nodiscard]] HRESULT _PaintFrameForEngine(_In_ IRenderEngine* const pEngine) noexcept;

        bool _CheckViewportAndScroll();

        [[nodiscard]] HRESULT _PaintBackground(_In_ IRenderEngine* const pEngine);

        void _PaintBufferOutput(_In_ IRenderEngine* const pEngine);

        void _PaintBufferOutputHelper(_In_ IRenderEngine* const pEngine,
                                      TextBufferCellIterator it,
                                      const COORD target,
                                      const bool lineWrapped);

        static IRenderEngine::GridLines s_GetGridlines(const TextAttribute& textAttribute) noexcept;

        void _PaintBufferOutputGridLineHelper(_In_ IRenderEngine* const pEngine,
                                              const TextAttribute textAttribute,
                                              const size_t cchLine,
                                              const COORD coordTarget);

        void _PaintSelection(_In_ IRenderEngine* const pEngine);
        void _PaintCursor(_In_ IRenderEngine* const pEngine);

        void _PaintOverlays(_In_ IRenderEngine* const pEngine);
        void _PaintOverlay(IRenderEngine& engine, const RenderOverlay& overlay);

        [[nodiscard]] HRESULT _UpdateDrawingBrushes(_In_ IRenderEngine* const pEngine, const TextAttribute attr, const bool isSettingDefaultBrushes);

        [[nodiscard]] HRESULT _PerformScrolling(_In_ IRenderEngine* const pEngine);

        Microsoft::Console::Types::Viewport _viewport;

        static constexpr float _shrinkThreshold = 0.8f;
        std::vector<Cluster> _clusterBuffer;

        std::vector<SMALL_RECT> _GetSelectionRects() const;
        void _ScrollPreviousSelection(const til::point delta);
        std::vector<SMALL_RECT> _previousSelection;

        [[nodiscard]] HRESULT _PaintTitle(IRenderEngine* const pEngine);

        [[nodiscard]] std::optional<CursorOptions> _GetCursorInfo();
        [[nodiscard]] HRESULT _PrepareRenderInfo(_In_ IRenderEngine* const pEngine);

        // Helper functions to diagnose issues with painting and layout.
        // These are only actually effective/on in Debug builds when the flag is set using an attached debugger.
        bool _fDebug = false;

        std::function<void()> _pfnRendererEnteredErrorState;

#ifdef UNIT_TESTING
        friend class ConptyOutputTests;
#endif
    };
}