#pragma once

#include "ProjectPanel.h"

#include "Rendering/Assets/BuiltInIcons.h"
#include "UI/Styles/EditorTreeViewStyle.h"

#include <XCEditor/Collections/UIEditorTreeView.h>
#include <XCEditor/Foundation/UIEditorTheme.h>

#include <algorithm>
#include <cmath>
#include <string_view>

namespace XCEngine::UI::Editor::App::ProjectPanelSupport {

using ::XCEngine::UI::Editor::UIEditorTextMeasureRequest;
using ::XCEngine::UI::Editor::UIEditorTextMeasurer;
using ::XCEngine::UI::UIColor;
using ::XCEngine::UI::UIDrawList;
using ::XCEngine::UI::UIInputEvent;
using ::XCEngine::UI::UIInputEventType;
using ::XCEngine::UI::UIPoint;
using ::XCEngine::UI::UIRect;
using Widgets::AppendUIEditorTreeViewBackground;
using Widgets::AppendUIEditorTreeViewForeground;

inline constexpr std::string_view kProjectPanelId = "project";
inline constexpr std::size_t kInvalidLayoutIndex = static_cast<std::size_t>(-1);

inline constexpr float kBrowserHeaderHeight = 24.0f;
inline constexpr float kNavigationMinWidth = 180.0f;
inline constexpr float kBrowserMinWidth = 260.0f;
inline constexpr float kHeaderHorizontalPadding = 10.0f;
inline constexpr float kHeaderBottomBorderThickness = 1.0f;
inline constexpr float kBreadcrumbItemPaddingX = 4.0f;
inline constexpr float kBreadcrumbItemPaddingY = 1.0f;
inline constexpr float kBreadcrumbSpacing = 3.0f;
inline constexpr float kTreeTopPadding = 0.0f;
inline constexpr float kGridInsetX = 16.0f;
inline constexpr float kGridInsetY = 12.0f;
inline constexpr float kGridTileWidth = 92.0f;
inline constexpr float kGridTileHeight = 92.0f;
inline constexpr float kGridTileGapX = 12.0f;
inline constexpr float kGridTileGapY = 12.0f;
inline constexpr float kGridPreviewWidth = 68.0f;
inline constexpr float kGridPreviewHeight = 54.0f;
inline constexpr float kHeaderFontSize = 12.0f;
inline constexpr float kTileLabelFontSize = 11.0f;

inline constexpr UIColor kSurfaceColor(0.10f, 0.10f, 0.10f, 1.0f);
inline constexpr UIColor kPaneColor(0.10f, 0.10f, 0.10f, 1.0f);
inline constexpr UIColor kHeaderColor(0.11f, 0.11f, 0.11f, 1.0f);
inline constexpr UIColor kTextPrimary(0.880f, 0.880f, 0.880f, 1.0f);
inline constexpr UIColor kTextStrong(0.930f, 0.930f, 0.930f, 1.0f);
inline constexpr UIColor kTextMuted(0.640f, 0.640f, 0.640f, 1.0f);
inline constexpr UIColor kTileHoverColor(0.14f, 0.14f, 0.14f, 1.0f);
inline constexpr UIColor kTileSelectedColor(0.18f, 0.18f, 0.18f, 1.0f);
inline constexpr UIColor kTilePreviewFillColor(0.15f, 0.15f, 0.15f, 1.0f);
inline constexpr UIColor kTilePreviewShadeColor(0.12f, 0.12f, 0.12f, 1.0f);
inline constexpr UIColor kTilePreviewOutlineColor(0.920f, 0.920f, 0.920f, 0.20f);

inline bool ContainsPoint(const UIRect& rect, const UIPoint& point) {
    return point.x >= rect.x &&
        point.x <= rect.x + rect.width &&
        point.y >= rect.y &&
        point.y <= rect.y + rect.height;
}

inline float ClampNonNegative(float value) {
    return (std::max)(value, 0.0f);
}

inline float ResolveTextTop(float rectY, float rectHeight, float fontSize) {
    const float lineHeight = fontSize * 1.6f;
    return rectY + std::floor((rectHeight - lineHeight) * 0.5f);
}

inline float MeasureTextWidth(
    const UIEditorTextMeasurer* textMeasurer,
    std::string_view text,
    float fontSize) {
    if (text.empty()) {
        return 0.0f;
    }

    if (textMeasurer != nullptr) {
        const float measuredWidth =
            textMeasurer->MeasureTextWidth(UIEditorTextMeasureRequest{ text, fontSize });
        if (measuredWidth > 0.0f) {
            return measuredWidth;
        }
    }

    return static_cast<float>(text.size()) * fontSize * 0.56f;
}

inline std::vector<UIInputEvent> FilterProjectPanelInputEvents(
    const UIRect& bounds,
    const std::vector<UIInputEvent>& inputEvents,
    bool allowInteraction,
    bool panelActive,
    bool captureActive) {
    if (!allowInteraction && !captureActive) {
        return {};
    }

    std::vector<UIInputEvent> filteredEvents = {};
    filteredEvents.reserve(inputEvents.size());
    for (const UIInputEvent& event : inputEvents) {
        switch (event.type) {
        case UIInputEventType::PointerMove:
        case UIInputEventType::PointerButtonDown:
        case UIInputEventType::PointerButtonUp:
        case UIInputEventType::PointerWheel:
            if (captureActive || ContainsPoint(bounds, event.position)) {
                filteredEvents.push_back(event);
            }
            break;
        case UIInputEventType::PointerLeave:
            filteredEvents.push_back(event);
            break;
        case UIInputEventType::FocusGained:
        case UIInputEventType::FocusLost:
            if (panelActive || captureActive) {
                filteredEvents.push_back(event);
            }
            break;
        case UIInputEventType::KeyDown:
        case UIInputEventType::KeyUp:
        case UIInputEventType::Character:
            if (panelActive) {
                filteredEvents.push_back(event);
            }
            break;
        default:
            break;
        }
    }

    return filteredEvents;
}

inline std::vector<UIInputEvent> FilterTreeInputEvents(
    const std::vector<UIInputEvent>& inputEvents,
    bool suppressPointerInput) {
    if (!suppressPointerInput) {
        return inputEvents;
    }

    std::vector<UIInputEvent> filteredEvents = {};
    filteredEvents.reserve(inputEvents.size());
    for (const UIInputEvent& event : inputEvents) {
        switch (event.type) {
        case UIInputEventType::PointerMove:
        case UIInputEventType::PointerButtonDown:
        case UIInputEventType::PointerButtonUp:
        case UIInputEventType::PointerWheel:
        case UIInputEventType::PointerEnter:
            break;
        default:
            filteredEvents.push_back(event);
            break;
        }
    }
    return filteredEvents;
}

inline ::XCEngine::UI::UITextureHandle ResolveFolderIcon(const BuiltInIcons* icons) {
    return icons != nullptr
        ? icons->Resolve(BuiltInIconKind::Folder)
        : ::XCEngine::UI::UITextureHandle {};
}

inline float ClampNavigationWidth(float value, float totalWidth) {
    const float maxWidth =
        (std::max)(
            kNavigationMinWidth,
            totalWidth - kBrowserMinWidth - ResolveUIEditorDockHostMetrics().splitterMetrics.thickness);
    return std::clamp(value, kNavigationMinWidth, maxWidth);
}

inline void AppendTilePreview(
    UIDrawList& drawList,
    const UIRect& previewRect,
    bool directory) {
    if (directory) {
        const UIRect tabRect(
            previewRect.x + 8.0f,
            previewRect.y + 7.0f,
            22.0f,
            7.0f);
        const UIRect bodyRect(
            previewRect.x + 4.0f,
            previewRect.y + 13.0f,
            previewRect.width - 8.0f,
            previewRect.height - 18.0f);
        drawList.AddFilledRect(tabRect, kTilePreviewShadeColor, 1.0f);
        drawList.AddFilledRect(bodyRect, kTilePreviewFillColor, 1.0f);
        drawList.AddRectOutline(bodyRect, kTilePreviewOutlineColor, 1.0f, 1.0f);
        return;
    }

    const UIRect sheetRect(
        previewRect.x + 10.0f,
        previewRect.y + 4.0f,
        previewRect.width - 20.0f,
        previewRect.height - 8.0f);
    const UIRect accentRect(
        sheetRect.x,
        sheetRect.y,
        sheetRect.width,
        7.0f);
    drawList.AddFilledRect(sheetRect, kTilePreviewFillColor, 1.0f);
    drawList.AddFilledRect(accentRect, kTilePreviewShadeColor, 1.0f);
    drawList.AddRectOutline(sheetRect, kTilePreviewOutlineColor, 1.0f, 1.0f);
}

} // namespace XCEngine::UI::Editor::App::ProjectPanelSupport