/*****************************************************************************
 * Copyright (c) 2014-2026 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 "Screenshot.h"

#include "../Context.h"
#include "../Diagnostic.h"
#include "../Game.h"
#include "../GameState.h"
#include "../OpenRCT2.h"
#include "../PlatformEnvironment.h"
#include "../actions/cheats/CheatSetAction.h"
#include "../audio/Audio.h"
#include "../config/Config.h"
#include "../core/Console.hpp"
#include "../core/EnumUtils.hpp"
#include "../core/File.h"
#include "../core/Imaging.h"
#include "../core/Path.hpp"
#include "../core/String.hpp"
#include "../drawing/Drawing.h"
#include "../drawing/X8DrawingEngine.h"
#include "../localisation/Formatter.h"
#include "../paint/Painter.h"
#include "../paint/tile_element/Paint.TileElement.h"
#include "../platform/Platform.h"
#include "../world/Map.h"
#include "../world/Park.h"
#include "../world/Weather.h"
#include "../world/tile_element/SurfaceElement.h"
#include "Viewport.h"

#include <cctype>
#include <chrono>
#include <cstdlib>
#include <memory>
#include <optional>
#include <string>

using namespace std::literals::string_literals;
using namespace OpenRCT2;
using namespace OpenRCT2::Drawing;

extern CoordsXY gClipSelectionA;
extern CoordsXY gClipSelectionB;
extern uint8_t gClipHeight;

uint8_t gScreenshotCountdown = 0;

static bool WriteRTToFile(std::string_view path, const RenderTarget& rt, const GamePalette& palette)
{
    auto const pixels8 = reinterpret_cast<uint8_t*>(rt.bits);
    auto const pixelsLen = rt.LineStride() * rt.height;
    try
    {
        Image image;
        image.Width = rt.width;
        image.Height = rt.height;
        image.Depth = 8;
        image.Stride = rt.LineStride();
        image.Palette = palette;
        image.Pixels = std::vector<uint8_t>(pixels8, pixels8 + pixelsLen);
        Imaging::WriteToFile(path, image, ImageFormat::png);
        return true;
    }
    catch (const std::exception& e)
    {
        LOG_ERROR("Unable to write png: %s", e.what());
        return false;
    }
}

/**
 *
 *  rct2: 0x006E3AEC
 */
void ScreenshotCheck()
{
    if (gScreenshotCountdown != 0)
    {
        gScreenshotCountdown--;
        if (gScreenshotCountdown == 0)
        {
            // update_weather_animation();
            std::string screenshotPath = ScreenshotDump();

            if (!screenshotPath.empty())
            {
                Audio::Play(Audio::SoundId::windowOpen, 100, ContextGetWidth() / 2);

                // Show user that screenshot saved successfully
                const auto filename = Path::GetFileName(screenshotPath);
                Formatter ft;
                ft.Add<StringId>(STR_STRING);
                ft.Add<const utf8*>(filename.c_str());
                ContextShowError(STR_SCREENSHOT_SAVED_AS, kStringIdNone, ft, true);
            }
            else
            {
                ContextShowError(STR_SCREENSHOT_FAILED, kStringIdNone, {}, true);
            }

            // redraw_weather();
        }
    }
}

static std::string ScreenshotGetParkName()
{
    return getGameState().park.name;
}

static std::string ScreenshotGetDirectory()
{
    auto& env = GetContext()->GetPlatformEnvironment();
    return env.GetDirectoryPath(DirBase::user, DirId::screenshots);
}

static std::pair<RealWorldDate, RealWorldTime> ScreenshotGetDateTime()
{
    auto date = Platform::GetDateLocal();
    auto time = Platform::GetTimeLocal();

    return { date, time };
}

static std::string ScreenshotGetFormattedDateTime()
{
    auto [date, time] = ScreenshotGetDateTime();
    char formatted[64];
    snprintf(
        formatted, sizeof(formatted), "%4d-%02d-%02d %02d-%02d-%02d", date.year, date.month, date.day, time.hour, time.minute,
        time.second);
    return formatted;
}

static std::optional<std::string> ScreenshotGetNextPath()
{
    auto screenshotDirectory = ScreenshotGetDirectory();
    if (!Path::CreateDirectory(screenshotDirectory))
    {
        LOG_ERROR("Unable to save screenshots in OpenRCT2 screenshot directory.");
        return std::nullopt;
    }

    auto parkName = ScreenshotGetParkName();
    auto dateTime = ScreenshotGetFormattedDateTime();
    auto name = parkName + " " + dateTime;

    // Generate a path with a `tries` number
    auto pathComposer = [&screenshotDirectory, &name](int tries) {
        auto composedFilename = Platform::SanitiseFilename(
            name + ((tries > 0) ? " ("s + std::to_string(tries) + ")"s : ""s) + ".png"s);
        return screenshotDirectory + PATH_SEPARATOR + composedFilename;
    };

    for (int tries = 0; tries < 100; tries++)
    {
        auto path = pathComposer(tries);
        if (!File::Exists(path))
        {
            return path;
        }
    }

    LOG_ERROR("You have too many saved screenshots saved at exactly the same date and time.");
    return std::nullopt;
}

std::string ScreenshotDumpPNG(RenderTarget& rt)
{
    // Get a free screenshot path
    auto path = ScreenshotGetNextPath();

    if (!path.has_value())
    {
        return {};
    }

    if (WriteRTToFile(path.value(), rt, gPalette))
    {
        return path.value();
    }

    return {};
}

static int32_t GetHighestBaseClearanceZ(const CoordsXY& location, const bool useViewClipping)
{
    int32_t z = 0;
    auto element = MapGetFirstElementAt(location);
    if (element != nullptr)
    {
        do
        {
            if (useViewClipping && (element->GetBaseZ() > gClipHeight * kCoordsZStep))
            {
                continue;
            }
            z = std::max<int32_t>(z, element->GetBaseZ());
            z = std::max<int32_t>(z, element->GetClearanceZ());
        } while (!(element++)->IsLastForTile());
    }
    return z;
}

static int32_t GetTallestVisibleTileTop(
    int32_t rotation, TileCoordsXY startCoords, TileCoordsXY endCoords, const bool useViewClipping)
{
    int32_t minViewY = std::numeric_limits<int32_t>::max();
    for (int32_t y = startCoords.y; y <= endCoords.y; y++)
    {
        for (int32_t x = startCoords.x; x <= endCoords.x; x++)
        {
            auto location = TileCoordsXY(x, y).ToCoordsXY();
            int32_t z = GetHighestBaseClearanceZ(location, useViewClipping);
            int32_t viewY = Translate3DTo2DWithZ(rotation, CoordsXYZ(location.ToTileCentre(), z)).y;
            minViewY = std::min(minViewY, viewY);
        }
    }
    // Some objects have a lower clearance than the actual sprite.
    return minViewY - 64;
}

static RenderTarget CreateRT(const Viewport& viewport)
{
    RenderTarget rt;
    rt.width = viewport.width;
    rt.height = viewport.height;
    rt.bits = new (std::nothrow) PaletteIndex[rt.width * rt.height];
    if (rt.bits == nullptr)
    {
        throw std::runtime_error("Giant screenshot failed, unable to allocate memory for image.");
    }

    if (viewport.flags & VIEWPORT_FLAG_TRANSPARENT_BACKGROUND)
    {
        std::memset(rt.bits, EnumValue(PaletteIndex::transparent), static_cast<size_t>(rt.width) * rt.height);
    }

    return rt;
}

static void ReleaseRT(RenderTarget& rt)
{
    if (rt.bits != nullptr)
        delete[] rt.bits;
    rt.bits = nullptr;
    rt.width = 0;
    rt.height = 0;
}

static Viewport GetGiantViewport(int32_t rotation, ZoomLevel zoom)
{
    auto& gameState = getGameState();
    // Get the tile coordinates of each corner
    const TileCoordsXY cornerCoords[2][4] = {
        {
            // Map corners
            { 1, 1 },
            { gameState.mapSize.x - 2, gameState.mapSize.y - 2 },
            { 1, gameState.mapSize.y - 2 },
            { gameState.mapSize.x - 2, 1 },
        },
        {
            // Horizontal view clipping corners
            TileCoordsXY{ CoordsXY{ std::max(gClipSelectionA.x, 32), std::max(gClipSelectionA.y, 32) } },
            TileCoordsXY{ CoordsXY{ std::min(gClipSelectionB.x, (gameState.mapSize.x - 2) * 32),
                                    std::min(gClipSelectionB.y, (gameState.mapSize.y - 2) * 32) } },
            TileCoordsXY{
                CoordsXY{ std::max(gClipSelectionA.x, 32), std::min(gClipSelectionB.y, (gameState.mapSize.y - 2) * 32) } },
            TileCoordsXY{
                CoordsXY{ std::min(gClipSelectionB.x, (gameState.mapSize.x - 2) * 32), std::max(gClipSelectionA.y, 32) } },
        },
    };

    auto* const mainWindow = WindowGetMain();
    const auto* const mainViewport = WindowGetViewport(mainWindow);
    const bool useViewClipping = (mainViewport != nullptr && mainViewport->flags & VIEWPORT_FLAG_CLIP_VIEW);

    // Calculate the viewport bounds
    auto corners = cornerCoords[useViewClipping ? 1 : 0];
    auto screenCoords1 = Translate3DTo2DWithZ(rotation, { corners[0].ToCoordsXY().ToTileCentre(), 0 });
    auto screenCoords2 = Translate3DTo2DWithZ(rotation, { corners[1].ToCoordsXY().ToTileCentre(), 0 });
    auto screenCoords3 = Translate3DTo2DWithZ(rotation, { corners[2].ToCoordsXY().ToTileCentre(), 0 });
    auto screenCoords4 = Translate3DTo2DWithZ(rotation, { corners[3].ToCoordsXY().ToTileCentre(), 0 });

    auto left = std::min({ screenCoords1.x, screenCoords2.x, screenCoords3.x, screenCoords4.x }) - 32;
    auto top = GetTallestVisibleTileTop(rotation, corners[0], corners[1], useViewClipping);
    auto bottom = std::max({ screenCoords1.y, screenCoords2.y, screenCoords3.y, screenCoords4.y });
    auto right = std::max({ screenCoords1.x, screenCoords2.x, screenCoords3.x, screenCoords4.x }) + 32;

    Viewport viewport{};
    viewport.viewPos = { left, top };
    viewport.width = zoom.ApplyInversedTo(right - left);
    viewport.height = zoom.ApplyInversedTo(bottom - top);
    viewport.zoom = zoom;
    viewport.rotation = rotation;

    return viewport;
}

static void RenderViewport(IDrawingEngine* drawingEngine, const Viewport& viewport, RenderTarget& rt)
{
    // Ensure sprites appear regardless of rotation
    ResetAllSpriteQuadrantPlacements();

    std::unique_ptr<X8DrawingEngine> tempDrawingEngine;
    if (drawingEngine == nullptr)
    {
        tempDrawingEngine = std::make_unique<X8DrawingEngine>(GetContext()->GetUiContext());
        drawingEngine = tempDrawingEngine.get();
    }

    tempDrawingEngine->BeginDraw();

    rt.DrawingEngine = drawingEngine;
    ViewportRender(rt, &viewport);

    tempDrawingEngine->EndDraw();
}

void ScreenshotGiant()
{
    RenderTarget rt{};
    try
    {
        auto path = ScreenshotGetNextPath();
        if (!path.has_value())
        {
            throw std::runtime_error("Giant screenshot failed, unable to find a suitable destination path.");
        }

        const auto rotation = GetCurrentRotation();
        auto zoom = ZoomLevel{ 0 };
        auto* mainWindow = WindowGetMain();
        const auto* vp = WindowGetViewport(mainWindow);
        if (mainWindow != nullptr && vp != nullptr)
        {
            zoom = vp->zoom;
        }

        auto viewport = GetGiantViewport(rotation, zoom);
        if (vp != nullptr)
        {
            viewport.flags = vp->flags;
        }
        if (Config::Get().general.transparentScreenshot)
        {
            viewport.flags |= VIEWPORT_FLAG_TRANSPARENT_BACKGROUND;
        }

        rt = CreateRT(viewport);

        RenderViewport(nullptr, viewport, rt);
        WriteRTToFile(path.value(), rt, gPalette);

        // Show user that screenshot saved successfully
        const auto filename = Path::GetFileName(path.value());
        Formatter ft;
        ft.Add<StringId>(STR_STRING);
        ft.Add<const utf8*>(filename.c_str());
        ContextShowError(STR_SCREENSHOT_SAVED_AS, kStringIdNone, ft, true);
    }
    catch (const std::exception& e)
    {
        LOG_ERROR("%s", e.what());
        ContextShowError(STR_SCREENSHOT_FAILED, kStringIdNone, {}, true);
    }

    ReleaseRT(rt);
}

static void ApplyOptions(const ScreenshotOptions* options, Viewport& viewport)
{
    if (options->weather != Weather::Type::Sunny && options->weather != Weather::Type::Count)
    {
        Weather::forceWeather(Weather::Type{ static_cast<uint8_t>(EnumValue(options->weather) - 1) });
    }

    if (options->hide_guests)
    {
        viewport.flags |= VIEWPORT_FLAG_HIDE_GUESTS | VIEWPORT_FLAG_HIDE_STAFF;
    }

    if (options->hide_sprites)
    {
        viewport.flags |= VIEWPORT_FLAG_HIDE_ENTITIES;
    }

    if (options->mowed_grass)
    {
        CheatsSet(CheatType::setGrassLength, GRASS_LENGTH_MOWED);
    }

    if (options->clear_grass || options->tidy_up_park)
    {
        CheatsSet(CheatType::setGrassLength, GRASS_LENGTH_CLEAR_0);
    }

    if (options->water_plants || options->tidy_up_park)
    {
        CheatsSet(CheatType::waterPlants);
    }

    if (options->fix_vandalism || options->tidy_up_park)
    {
        CheatsSet(CheatType::fixVandalism);
    }

    if (options->remove_litter || options->tidy_up_park)
    {
        CheatsSet(CheatType::removeLitter);
    }

    if (options->transparent || Config::Get().general.transparentScreenshot)
    {
        viewport.flags |= VIEWPORT_FLAG_TRANSPARENT_BACKGROUND;
    }

    if (options->draw_bounding_boxes)
    {
        gPaintBoundingBoxes = true;
    }

    if (options->drawSegmentHeights)
    {
        gShowSupportSegmentHeights = true;
    }
}

int32_t CommandLineForScreenshot(const char** argv, int32_t argc, ScreenshotOptions* options)
{
    // Don't include options in the count (they have been handled by CommandLine::ParseOptions already)
    for (int32_t i = 0; i < argc; i++)
    {
        if (argv[i][0] == '-')
        {
            // Setting argc to i works, because options can only be at the end of the command
            argc = i;
            break;
        }
    }

    bool giantScreenshot = (argc == 5) && String::iequals(argv[2], "giant");
    if (argc != 4 && argc != 8 && argc != 9 && !giantScreenshot)
    {
        std::printf("Usage: openrct2 screenshot <file> <output_image> <width> <height> [<x> <y> [<z>] <zoom> <rotation>]\n");
        std::printf("Usage: openrct2 screenshot <file> <output_image> giant <zoom> <rotation>\n");
        return -1;
    }

    int32_t exitCode = 1;
    RenderTarget rt;
    try
    {
        bool customLocation = false;
        bool centreMapX = false;
        bool centreMapY = false;

        const char* inputPath = argv[0];
        const char* outputPath = argv[1];

        gOpenRCT2Headless = true;
        auto context = CreateContext();
        if (!context->Initialise())
        {
            throw std::runtime_error("Failed to initialize context.");
        }

        DrawingEngineInit();

        if (!context->LoadParkFromFile(inputPath))
        {
            throw std::runtime_error("Failed to load park.");
        }

        gLegacyScene = LegacyScene::playing;

        Viewport viewport{};
        if (giantScreenshot)
        {
            auto customZoom = static_cast<int8_t>(std::atoi(argv[3]));
            auto zoom = ZoomLevel{ customZoom };
            auto rotation = std::atoi(argv[4]) & 3;
            viewport = GetGiantViewport(rotation, zoom);
        }
        else
        {
            int32_t resolutionWidth = std::atoi(argv[2]);
            int32_t resolutionHeight = std::atoi(argv[3]);
            int32_t customX = 0;
            int32_t customY = 0;
            int32_t customZoom = 0;
            int32_t customRotation = 0;
            if (argc >= 8)
            {
                int32_t argOffset = argc == 8 ? 0 : 1;
                customLocation = true;
                if (argv[4][0] == 'c')
                    centreMapX = true;
                else
                    customX = std::atoi(argv[4]);

                if (argv[5][0] == 'c')
                    centreMapY = true;
                else
                    customY = std::atoi(argv[5]);

                customZoom = std::atoi(argv[6 + argOffset]);
                customRotation = std::atoi(argv[7 + argOffset]) & 3;
            }

            const auto& mapSize = getGameState().mapSize;
            if (resolutionWidth == 0 || resolutionHeight == 0)
            {
                resolutionWidth = (mapSize.x * kCoordsXYStep * 2) >> customZoom;
                resolutionHeight = (mapSize.y * kCoordsXYStep * 1) >> customZoom;

                resolutionWidth += 8;
                resolutionHeight += 128;
            }

            viewport.width = resolutionWidth;
            viewport.height = resolutionHeight;
            if (customLocation)
            {
                if (centreMapX)
                    customX = (mapSize.x / 2) * 32 + 16;
                if (centreMapY)
                    customY = (mapSize.y / 2) * 32 + 16;

                int32_t z = TileElementHeight({ customX, customY });
                if (argc == 9)
                    z = std::atoi(argv[6]);
                CoordsXYZ coords3d = { customX, customY, z };

                auto coords2d = Translate3DTo2DWithZ(customRotation, coords3d);

                viewport.viewPos = { coords2d.x - ((viewport.ViewWidth() << customZoom) / 2),
                                     coords2d.y - ((viewport.ViewHeight() << customZoom) / 2) };
                viewport.zoom = ZoomLevel{ static_cast<int8_t>(customZoom) };
                viewport.rotation = customRotation;
            }
            else
            {
                auto& gameState = getGameState();
                viewport.viewPos = { gameState.savedView
                                     - ScreenCoordsXY{ (viewport.ViewWidth() / 2), (viewport.ViewHeight() / 2) } };
                viewport.zoom = gameState.savedViewZoom;
                viewport.rotation = gameState.savedViewRotation;
            }
        }

        ApplyOptions(options, viewport);

        rt = CreateRT(viewport);

        RenderViewport(nullptr, viewport, rt);
        WriteRTToFile(outputPath, rt, gPalette);
    }
    catch (const std::exception& e)
    {
        std::printf("%s\n", e.what());
        exitCode = -1;
    }
    ReleaseRT(rt);

    DrawingEngineDispose();

    return exitCode;
}

static bool IsPathChildOf(fs::path x, const fs::path& parent)
{
    auto xp = x.parent_path();
    while (xp != x)
    {
        if (xp == parent)
        {
            return true;
        }
        x = xp;
        xp = x.parent_path();
    }
    return false;
}

static std::string ResolveFilenameForCapture(const fs::path& filename)
{
    if (filename.empty())
    {
        // Automatic filename
        auto path = ScreenshotGetNextPath();
        if (!path)
        {
            throw std::runtime_error("Unable to generate a filename for capture.");
        }
        return *path;
    }

    auto screenshotDirectory = fs::u8path(ScreenshotGetDirectory());
    auto screenshotPath = fs::absolute(screenshotDirectory / filename);

    // Check the filename isn't attempting to leave the screenshot directory for security
    if (!IsPathChildOf(screenshotPath, screenshotDirectory))
    {
        throw std::runtime_error("Filename is not a child of the screenshot directory.");
    }

    auto directory = screenshotPath.parent_path();
    if (!fs::is_directory(directory))
    {
        if (!fs::create_directory(directory, screenshotDirectory))
        {
            throw std::runtime_error("Unable to create directory.");
        }
    }

    return screenshotPath.u8string();
}

void CaptureImage(const CaptureOptions& options)
{
    Viewport viewport{};
    if (options.View.has_value())
    {
        viewport.width = options.View->Width;
        viewport.height = options.View->Height;

        auto z = TileElementHeight(options.View->Position);
        CoordsXYZ coords3d(options.View->Position, z);
        auto coords2d = Translate3DTo2DWithZ(options.Rotation, coords3d);
        viewport.viewPos = { coords2d.x - ((options.Zoom.ApplyTo(viewport.ViewWidth())) / 2),
                             coords2d.y - ((options.Zoom.ApplyTo(viewport.ViewHeight())) / 2) };
        viewport.zoom = options.Zoom;
        viewport.rotation = options.Rotation;
    }
    else
    {
        viewport = GetGiantViewport(options.Rotation, options.Zoom);
    }

    if (options.Transparent)
    {
        viewport.flags |= VIEWPORT_FLAG_TRANSPARENT_BACKGROUND;
    }

    auto outputPath = ResolveFilenameForCapture(options.Filename);
    auto rt = CreateRT(viewport);
    RenderViewport(nullptr, viewport, rt);
    WriteRTToFile(outputPath, rt, gPalette);
    ReleaseRT(rt);
}
