/*****************************************************************************
 * 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 "Painter.h"

#include "../Game.h"
#include "../Intro.h"
#include "../OpenRCT2.h"
#include "../ReplayManager.h"
#include "../config/Config.h"
#include "../drawing/Drawing.h"
#include "../drawing/IDrawingEngine.h"
#include "../interface/Chat.h"
#include "../interface/InteractiveConsole.h"
#include "../localisation/FormatCodes.h"
#include "../localisation/Formatting.h"
#include "../localisation/Language.h"
#include "../paint/Paint.h"
#include "../title/TitleScreen.h"
#include "../ui/UiContext.h"

using namespace OpenRCT2;
using namespace OpenRCT2::Drawing;
using namespace OpenRCT2::Paint;
using namespace OpenRCT2::Ui;

Painter::Painter(const std::shared_ptr<IUiContext>& uiContext)
    : _uiContext(uiContext)
{
}

void Painter::Paint(IDrawingEngine& de)
{
    auto dpi = de.GetDrawingPixelInfo();
    if (gIntroState != IntroState::None)
    {
        intro_draw(dpi);
    }
    else
    {
        de.PaintWindows();

        update_palette_effects();
        _uiContext->Draw(dpi);

        if ((gScreenFlags & SCREEN_FLAGS_TITLE_DEMO) && !title_should_hide_version_info())
        {
            DrawOpenRCT2(dpi, { 0, _uiContext->GetHeight() - 20 });
        }

        gfx_draw_pickedup_peep(dpi);
        gfx_invalidate_pickedup_peep();

        de.PaintWeather();
    }

    auto* replayManager = GetContext()->GetReplayManager();
    const char* text = nullptr;

    if (replayManager->IsReplaying())
        text = "Replaying...";
    else if (replayManager->ShouldDisplayNotice())
        text = "Recording...";
    else if (replayManager->IsNormalising())
        text = "Normalising...";

    if (text != nullptr)
        PaintReplayNotice(dpi, text);

    if (gConfigGeneral.show_fps)
    {
        PaintFPS(dpi);
    }
    gCurrentDrawCount++;
}

void Painter::PaintReplayNotice(rct_drawpixelinfo* dpi, const char* text)
{
    ScreenCoordsXY screenCoords(_uiContext->GetWidth() / 2, _uiContext->GetHeight() - 44);

    char buffer[64]{};
    FormatStringToBuffer(buffer, sizeof(buffer), "{OUTLINE}{RED}{STRING}", text);

    auto stringWidth = gfx_get_string_width(buffer, FontSpriteBase::MEDIUM);
    screenCoords.x = screenCoords.x - stringWidth;

    if (((gCurrentTicks >> 1) & 0xF) > 4)
        gfx_draw_string(dpi, screenCoords, buffer, { COLOUR_SATURATED_RED });

    // Make area dirty so the text doesn't get drawn over the last
    gfx_set_dirty_blocks({ screenCoords, screenCoords + ScreenCoordsXY{ stringWidth, 16 } });
}

void Painter::PaintFPS(rct_drawpixelinfo* dpi)
{
    ScreenCoordsXY screenCoords(_uiContext->GetWidth() / 2, 2);

    MeasureFPS();

    char buffer[64]{};
    FormatStringToBuffer(buffer, sizeof(buffer), "{OUTLINE}{WHITE}{INT32}", _currentFPS);

    // Draw Text
    int32_t stringWidth = gfx_get_string_width(buffer, FontSpriteBase::MEDIUM);
    screenCoords.x = screenCoords.x - (stringWidth / 2);
    gfx_draw_string(dpi, screenCoords, buffer);

    // Make area dirty so the text doesn't get drawn over the last
    gfx_set_dirty_blocks({ { screenCoords - ScreenCoordsXY{ 16, 4 } }, { dpi->lastStringPos.x + 16, 16 } });
}

void Painter::MeasureFPS()
{
    _frames++;

    auto currentTime = time(nullptr);
    if (currentTime != _lastSecond)
    {
        _currentFPS = _frames;
        _frames = 0;
    }
    _lastSecond = currentTime;
}

paint_session* Painter::CreateSession(rct_drawpixelinfo* dpi, uint32_t viewFlags)
{
    paint_session* session = nullptr;

    if (_freePaintSessions.empty() == false)
    {
        // Re-use.
        session = _freePaintSessions.back();

        // Shrink by one.
        _freePaintSessions.pop_back();
    }
    else
    {
        // Create new one in pool.
        _paintSessionPool.emplace_back(std::make_unique<paint_session>());
        session = _paintSessionPool.back().get();
    }

    session->DPI = *dpi;
    session->ViewFlags = viewFlags;
    session->QuadrantBackIndex = std::numeric_limits<uint32_t>::max();
    session->QuadrantFrontIndex = 0;
    session->PaintEntryChain = _paintStructPool.Create();

    std::fill(std::begin(session->Quadrants), std::end(session->Quadrants), nullptr);
    session->LastPS = nullptr;
    session->LastAttachedPS = nullptr;
    session->PSStringHead = nullptr;
    session->LastPSString = nullptr;
    session->WoodenSupportsPrependTo = nullptr;
    session->CurrentlyDrawnItem = nullptr;
    session->SurfaceElement = nullptr;

    return session;
}

void Painter::ReleaseSession(paint_session* session)
{
    session->PaintEntryChain.Clear();
    _freePaintSessions.push_back(session);
}

Painter::~Painter()
{
    for (auto&& session : _paintSessionPool)
    {
        ReleaseSession(session.get());
    }
    _paintSessionPool.clear();
}
