/*****************************************************************************
 * Copyright (c) 2014-2020 OpenRCT2 developers
 *
 * For a complete list of all authors, please refer to contributors.md
 * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
 *
 * OpenRCT2 is licensed under the GNU General Public License version 3.
 *****************************************************************************/

#include <openrct2-ui/interface/Viewport.h>
#include <openrct2-ui/interface/Widget.h>
#include <openrct2-ui/windows/Window.h>
#include <openrct2/Context.h>
#include <openrct2/Game.h>
#include <openrct2/audio/audio.h>
#include <openrct2/localisation/Localisation.h>
#include <openrct2/sprites.h>

// clang-format off
enum WINDOW_VIEWPORT_WIDGET_IDX
{
    WIDX_BACKGROUND,
    WIDX_TITLE,
    WIDX_CLOSE,
    WIDX_CONTENT_PANEL,
    WIDX_VIEWPORT,
    WIDX_ZOOM_IN,
    WIDX_ZOOM_OUT,
    WIDX_LOCATE,
};

#pragma region MEASUREMENTS

static constexpr const rct_string_id WINDOW_TITLE = STR_VIEWPORT_NO;
static constexpr const int32_t WW = 200;
static constexpr const int32_t WH = 200;

static constexpr ScreenSize VIEWPORT_BUTTON = {24, 24};

#pragma endregion

static rct_widget window_viewport_widgets[] =
{
    WINDOW_SHIM(WINDOW_TITLE, WW, WH),
    MakeWidget({      0, 14}, { WW - 1, WH - 1}, WindowWidgetType::Resize,   WindowColour::Secondary                                         ), // resize
    MakeWidget({      3, 17}, {WW - 26, WH - 3}, WindowWidgetType::Viewport, WindowColour::Primary                                           ), // viewport
    MakeWidget({WW - 25, 17}, VIEWPORT_BUTTON,   WindowWidgetType::FlatBtn,  WindowColour::Primary  , SPR_G2_ZOOM_IN,  STR_ZOOM_IN_TIP       ), // zoom in
    MakeWidget({WW - 25, 41}, VIEWPORT_BUTTON,   WindowWidgetType::FlatBtn,  WindowColour::Primary  , SPR_G2_ZOOM_OUT, STR_ZOOM_OUT_TIP      ), // zoom out
    MakeWidget({WW - 25, 65}, VIEWPORT_BUTTON,   WindowWidgetType::FlatBtn,  WindowColour::Primary  , SPR_LOCATE,      STR_LOCATE_SUBJECT_TIP), // locate
    WIDGETS_END,
};

// clang-format on

class ViewportWindow final : public Window
{
private:
    void GetFreeViewportNumber()
    {
        number = 1;
        window_visit_each([&](rct_window* w) {
            if (w != nullptr && w != this && w->classification == WC_VIEWPORT)
            {
                if (w->number >= number)
                    number = w->number + 1;
            }
        });
    }

public:
    void OnOpen() override
    {
        GetFreeViewportNumber();

        widgets = window_viewport_widgets;
        enabled_widgets = (1ULL << WIDX_CLOSE) | (1ULL << WIDX_ZOOM_IN) | (1ULL << WIDX_ZOOM_OUT) | (1ULL << WIDX_LOCATE);

        // Create viewport
        viewport_create(this, windowPos, width, height, Focus(TileCoordsXYZ(128, 128, 0).ToCoordsXYZ()));
        if (viewport == nullptr)
        {
            Close();
            WindowErrorOpen("Unexpected Error", "Failed to create viewport window.");
            return;
        }

        auto* mainWindow = window_get_main();
        if (mainWindow != nullptr)
        {
            rct_viewport* mainViewport = mainWindow->viewport;
            int32_t x = mainViewport->viewPos.x + (mainViewport->view_width / 2);
            int32_t y = mainViewport->viewPos.y + (mainViewport->view_height / 2);
            savedViewPos = { x - (viewport->view_width / 2), y - (viewport->view_height / 2) };
        }

        viewport->flags |= VIEWPORT_FLAG_SOUND_ON;

        min_width = WW;
        min_height = WH;
        max_width = WW;
        max_height = WH;
    }

    void OnUpdate() override
    {
        auto* mainWindow = window_get_main();
        if (mainWindow == nullptr)
            return;

        if (viewport != nullptr && viewport->flags != mainWindow->viewport->flags)
        {
            viewport->flags = mainWindow->viewport->flags;
            Invalidate();
        }

        // Not sure how to invalidate part of the viewport that has changed, this will have to do for now
        // widget_invalidate(this, WIDX_VIEWPORT);
    }

    void OnMouseUp(rct_widgetindex widgetIndex) override
    {
        switch (widgetIndex)
        {
            case WIDX_CLOSE:
                Close();
                break;
            case WIDX_ZOOM_IN:
                if (viewport != nullptr && viewport->zoom > ZoomLevel::min())
                {
                    viewport->zoom--;
                    Invalidate();
                }
                break;
            case WIDX_ZOOM_OUT:
                if (viewport != nullptr && viewport->zoom < ZoomLevel::max())
                {
                    viewport->zoom++;
                    Invalidate();
                }
                break;
            case WIDX_LOCATE:
                auto* mainWindow = window_get_main();
                if (mainWindow != nullptr)
                {
                    auto info = get_map_coordinates_from_pos(
                        { windowPos.x + (width / 2), windowPos.y + (height / 2) }, ViewportInteractionItemAll);
                    window_scroll_to_location(mainWindow, { info.Loc, tile_element_height(info.Loc) });
                }
                break;
        }
    }

    void OnDraw(rct_drawpixelinfo& dpi) override
    {
        DrawWidgets(dpi);

        // Draw viewport
        if (viewport != nullptr)
            window_draw_viewport(&dpi, this);
    }

    void OnResize() override
    {
        int32_t screenWidth = context_get_width();
        int32_t screenHeight = context_get_height();

        max_width = (screenWidth * 4) / 5;
        max_height = (screenHeight * 4) / 5;

        min_width = WW;
        min_height = WH;

        window_set_resize(this, min_width, min_height, max_width, max_height);
    }

    void OnPrepareDraw() override
    {
        rct_widget* viewportWidget = &window_viewport_widgets[WIDX_VIEWPORT];

        widgets[WIDX_BACKGROUND].right = width - 1;
        widgets[WIDX_BACKGROUND].bottom = height - 1;
        widgets[WIDX_TITLE].right = width - 2;
        widgets[WIDX_CLOSE].left = width - 13;
        widgets[WIDX_CLOSE].right = width - 3;
        widgets[WIDX_CONTENT_PANEL].right = width - 1;
        widgets[WIDX_CONTENT_PANEL].bottom = height - 1;
        widgets[WIDX_ZOOM_IN].left = width - 27;
        widgets[WIDX_ZOOM_IN].right = width - 2;
        widgets[WIDX_ZOOM_OUT].left = width - 27;
        widgets[WIDX_ZOOM_OUT].right = width - 2;
        widgets[WIDX_LOCATE].left = width - 27;
        widgets[WIDX_LOCATE].right = width - 2;
        widgets[WIDX_VIEWPORT].right = widgets[WIDX_ZOOM_IN].left - 1;
        widgets[WIDX_VIEWPORT].bottom = widgets[WIDX_BACKGROUND].bottom - 3;

        // Set title
        Formatter::Common().Add<uint32_t>(number);

        // Set disabled widgets
        disabled_widgets = 0;
        if (viewport != nullptr && viewport->zoom == ZoomLevel::min())
            disabled_widgets |= 1ULL << WIDX_ZOOM_IN;
        if (viewport != nullptr && viewport->zoom >= ZoomLevel::max())
            disabled_widgets |= 1ULL << WIDX_ZOOM_OUT;

        if (viewport != nullptr)
        {
            viewport->pos = windowPos + ScreenCoordsXY{ viewportWidget->left + 1, viewportWidget->top + 1 };
            viewport->width = widgets[WIDX_VIEWPORT].width() - 1;
            viewport->height = widgets[WIDX_VIEWPORT].height() - 1;
            viewport->view_width = viewport->width * viewport->zoom;
            viewport->view_height = viewport->height * viewport->zoom;
        }
    }
};

rct_window* WindowViewportOpen()
{
    int32_t screenWidth = context_get_width();
    int32_t screenHeight = context_get_height();
    int32_t width = (screenWidth / 2);
    int32_t height = (screenHeight / 2);

    auto* w = WindowCreate<ViewportWindow>(WC_VIEWPORT, std::max(WW, width), std::max(WH, height), WF_RESIZABLE);

    if (w != nullptr)
        return w;
    return nullptr;
}
