#pragma once

#include <stdint.h>
#include <tuple>

#include "cocos2d.h"
#include "ExtensionMacros.h"

#include "imgui/imgui.h"

// #define HAVE_IMGUI_MARKDOWN 1

NS_CC_EXT_BEGIN

class ImGuiEXTEventTracker;
class ImGuiEXT
{
    friend class ImGuiEXTRenderer;
    void init();
    void cleanup();
public:

    enum class CHS_GLYPH_RANGE {
        NONE,
        GENERAL,
        FULL
    };

    enum {
        DEFAULT_FONT_SIZE = 13 // see imgui.cpp
    };

    static ImGuiEXT* getInstance();
    static void destroyInstance();
    static void setOnInit(const std::function<void(ImGuiEXT*)>& callBack);

    /// <summary>
    /// Scale ImGui with majorMoniter DPI scaling
    /// </summary>
    /// <param name="userScale">Usually is 1.0</param>
    /// <param name="fontFile">The full path of .ttc/.ttf file</param>
    /// <returns>The final contentZoomFactor = userScale * dpiScale</returns>
    float scaleAllByDPI(float userScale);
    float getContentZoomFactor() const { return _contentZoomFactor; }

    /// <summary>
    /// Add ImGui font with contentZoomFactor
    /// </summary>
    /// <param name="fontFile"></param>
    /// <param name="glyphRange"></param>
    void addFont(const std::string& fontFile, float fontSize = DEFAULT_FONT_SIZE, CHS_GLYPH_RANGE glyphRange = CHS_GLYPH_RANGE::NONE);
    void removeFont(const std::string& fontFile);
    void clearFonts();

    /// <summary>
    /// Add a ImGui render loop to specific scene
    /// </summary>
    /// <param name="id">The FOURCC id of render loop, starts with '#', such as "#abcd"</id>
    /// <param name="func">the ImGui render loop</param>
    /// <param name="target">The target scene to track event, nullptr for global, useful for global GM tools</param>
    bool addRenderLoop(const std::string& id, std::function<void()> func, Scene* target);

    /// <summary>
    /// Remove ImGui render loop
    /// </summary>
    /// <param name="id">FOURCC starts with '#', such as "#abcd"</id>
    void removeRenderLoop(const std::string& id);
    
    void end();

    // imgui helper
    void image(
        Texture2D* tex,
        const ImVec2& size,
        const ImVec2& uv0 = ImVec2(0, 0),
        const ImVec2& uv1 = ImVec2(1, 1),
        const ImVec4& tint_col = ImVec4(1, 1, 1, 1),
        const ImVec4& border_col = ImVec4(0, 0, 0, 0));
    void image(
        Sprite* sprite,
        const ImVec2& size,
        const ImVec4& tint_col = ImVec4(1, 1, 1, 1),
        const ImVec4& border_col = ImVec4(0, 0, 0, 0));
    bool imageButton(
        Texture2D* tex,
        const ImVec2& size,
        const ImVec2& uv0 = ImVec2(0, 0),
        const ImVec2& uv1 = ImVec2(1, 1),
        int frame_padding = -1,
        const ImVec4& bg_col = ImVec4(0, 0, 0, 0),
        const ImVec4& tint_col = ImVec4(1, 1, 1, 1));
    bool imageButton(
        Sprite* sprite,
        const ImVec2& size,
        int frame_padding = -1,
        const ImVec4& bg_col = ImVec4(0, 0, 0, 0),
        const ImVec4& tint_col = ImVec4(1, 1, 1, 1));

    void node(
        Node* node,
        const ImVec4& tint_col = ImVec4(1, 1, 1, 1),
        const ImVec4& border_col = ImVec4(0, 0, 0, 0));
    bool nodeButton(
        Node* node,
        int frame_padding = -1,
        const ImVec4& bg_col = ImVec4(0, 0, 0, 0),
        const ImVec4& tint_col = ImVec4(1, 1, 1, 1));

    std::tuple<ImTextureID, int> useTexture(Texture2D* texture);
    std::tuple<ImTextureID, ImVec2, ImVec2, int> useSprite(Sprite* sprite);
    std::tuple<ImTextureID, ImVec2, ImVec2, int> useNode(Node* node, const ImVec2& pos);

    static void setNodeColor(Node* node, const ImVec4& col);
    static void setNodeColor(Node* node, ImGuiCol col);
    static void setLabelColor(Label* label, const ImVec4& col);
    static void setLabelColor(Label* label, bool disabled = false);
    static void setLabelColor(Label* label, ImGuiCol col);

    ImWchar* addGlyphRanges(const std::string& key, const std::vector<ImWchar>& ranges);
    static void mergeFontGlyphs(ImFont* dst, ImFont* src, ImWchar start, ImWchar end);
    int getCCRefId(Ref* p);

#if defined(HAVE_IMGUI_MARKDOWN)
    // markdown

    using MdLinkCallback = std::function<void(const std::string&, const std::string&, bool)>;
    using MdImageCallback = std::function<std::tuple<Sprite*, ImVec2, ImVec4, ImVec4>(const std::string&, const std::string&)>;

    void setMarkdownLinkCallback(const MdLinkCallback& f);
    void setMarkdownImageCallback(const MdImageCallback& f);
    void setMarkdownFont(int index, ImFont* font, bool seperator, float scale = 1.f);
    void setMarkdownLinkIcon(const std::string& icon);
    void markdown(const std::string& content);
#endif

private:
    static void loadCustomFonts(void*);

    // perform draw ImGui stubs
    void beginFrame();
    void update();
    void endFrame();

    static void deactiveImGuiViewports();

private:
    static std::function<void(ImGuiEXT*)> _onInit;

    struct RenderPipline {
        ImGuiEXTEventTracker* tracker;
        std::function<void()> frame;
    };

    std::unordered_map<uint32_t, RenderPipline> _renderPiplines;

    std::unordered_map<Ref*, int> usedCCRefIdMap;
    // cocos objects should be retained until next frame
    Vector<Ref*> usedCCRef;
    std::unordered_map<std::string, std::vector<ImWchar>> glyphRanges;

    float _contentZoomFactor = 1.0f;

    int64_t _beginFrames = 0;

    Texture2D* _fontsTexture = nullptr;

    struct FontInfo {
        float fontSize;
        CHS_GLYPH_RANGE glyphRange;
    };

    std::unordered_map<std::string, FontInfo> _fontsInfoMap;
    
    bool _purgeNextLoop = false;
};

NS_CC_EXT_END