#include "../sdlpp/sdlpp.hpp"
#include "sprites.hpp"
#include <memory>
#ifdef _WIN32
#include "../sdlpp/SDL2/SDL2_framerate.h"
#include <ctime>
#include <string>
#include <windows.h>
#else
#include <SDL2/SDL2_framerate.h>
#endif // UNIX

#include <thread>
#include <mutex>
#include <unordered_set>
#include "global_vars.hpp"
#include "objectids.hpp"
#include "blocks.hpp"
#include "maploader.hpp"
#include "mario.hpp"
#include "visitors/visitor_generator.hpp"

// TODO make shared scenes
#include "scenes/game_scenes.hpp"

bool update = false;
int update_count = 0;
bool newLoaded = false;
std::shared_ptr<Mario> mario = nullptr;
std::shared_ptr<SDLPP::RectangleRender> leftStop = nullptr;
std::shared_ptr<SDLPP::Renderer> renderer = nullptr;
std::shared_ptr<SDLPP::TextRenderer> fps = nullptr;
std::shared_ptr<SDLPP::TextRenderer> coins = nullptr;
int coin_count = 0;
int global_frames = 0;
std::string last_load_level = "";

std::vector<std::shared_ptr<MarioBlock>> moving_objects = {};
std::vector<SceneStruct> game_scenes{};

std::mutex render_mutex;
std::mutex gamescene_mutex;

void handleKeyDown(SDL_Keycode key, SDLPP::Scene &scene) {
    switch (key) {
    case SDLK_a:
        mario->walkLeft();
        break;
    case SDLK_d:
        mario->walkRight();
        break;
    case SDLK_SPACE:
    case SDLK_w:
        mario->jump();
        break;
    case SDLK_s:
        break;
    case SDLK_r:
        scene.getRenderer().setRenderColiders(
            !scene.getRenderer().getRenderColiders());
        break;
    case SDLK_f:
        if (fps) {
            fps->setHidden(!fps->getHidden());
        }
    default:
        break;
    }
}

void handleKeyUp(SDL_Keycode key) {
    switch (key) {
    case SDLK_ESCAPE: {
        std::lock_guard<std::mutex> lock(render_mutex);
        game_scenes.push_back(
            createGameMainMenuScene(renderer, false, true, true));
    } break;
    case SDLK_a:
        mario->walkRight();
        break;
    case SDLK_d:
        mario->walkLeft();
        break;
    case SDLK_SPACE:
    case SDLK_w:
        mario->stopJump();
    default:
        break;
    }
}

void moveToMarioPosition(SDLPP::Scene &scene,
                         SDLPP::Vec2D<double> &prev_mario) {
    auto rendDims = renderer->getDoubleDimensions();
    if (leftStop) {
        auto left =
            rendDims.getX() < 2.0 ? -(rendDims.getX() - 1) / 2.0 - 0.1 : -0.5;
        leftStop->setPos(left, 0);
    }
    auto mario_pos_difference = prev_mario - mario->getAbsolutePos();
    // sometimes there is a concurrency problem and prev_pos == cur_pos, in
    // that case move everything so Mario is standing on the left edge of the
    // screen
    if (mario_pos_difference.getX() < 0.01 &&
        mario_pos_difference.getX() > -0.01) {
        // 0.01 is the width of visible leftStop
        scene.moveEverything(-(mario->getAbsolutePos().getX() - 0.01), 0);
    } else {
        scene.moveEverything(mario_pos_difference.getX(), 0);
    }
    scene.updateSizeAndPosition();
    auto left_stop_rightmost = leftStop->getDoubleRect().first.getX() +
                               leftStop->getDoubleRect().second.getX();
    if (mario->getPos().getX() < left_stop_rightmost) {
        mario->setPos(left_stop_rightmost, mario->getPos().getY());
    }
}

void pollEvents(SDLPP::Scene &scene) {
    SDL_Event event;
    while (SDLPP::getSDLEvent(event)) {
        switch (event.type) {
        case SDL_QUIT:
            g_quit = true;
            break;
        case SDL_KEYDOWN:
            if (!event.key.repeat) {
                handleKeyDown(event.key.keysym.sym, scene);
            }
            break;
        case SDL_KEYUP:
            handleKeyUp(event.key.keysym.sym);
            break;
        case SDL_WINDOWEVENT:
            if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
                auto prev_mario_pos = mario->getAbsolutePos();
                scene.updateSizeAndPosition();
                moveToMarioPosition(scene, prev_mario_pos);
                update = true;
                update_count = 2;
            }
        default:
            break;
        }
    }
}

void doInputMainGame(std::shared_ptr<SDLPP::Scene> scene) {
    if (newLoaded) {
        auto prev_mario_pos = mario->getAbsolutePos();
        scene->updateSizeAndPosition();
        moveToMarioPosition(*scene, prev_mario_pos);
        update = true;
        update_count = 2;
        newLoaded = false;
    }
    if (g_death) {
        game_scenes.push_back(
            createGameMainMenuScene(renderer, true, false, true));
        g_death = false;
    }
    pollEvents(*scene);
    std::lock_guard<std::mutex> lock(render_mutex);
    scene->updateScene();
    auto prev_coin_count = coin_count;
    auto rightmost_x = renderer->getDoubleDimensions().getX();
    for (size_t i = 0; i < moving_objects.size(); i++) {
        moving_objects[i]->checkVisibility(rightmost_x);
        if (!moving_objects[i]->wasVisible()) {
            continue;
        }
        auto visitor = getVisitor(*moving_objects[i], *scene, g_death,
                                  coin_count, moving_objects);
        scene->visitCollisions(*moving_objects[i], *visitor);
        moving_objects[i]->handleVisitor(*visitor);
        auto rightmost_pos = moving_objects[i]->getAbsolutePos().getX() +
                             moving_objects[i]->getDoubleRect().second.getX();
        if (rightmost_pos < 0 && moving_objects[i] != mario) {
            moving_objects[i]->destroy();
        }
    }
    std::vector<uint64_t> killed_indices{};
    for (size_t i = 0; i < moving_objects.size(); i++) {
        if (moving_objects[i]->getKilled()) {
            killed_indices.push_back(i);
        }
    }
    std::reverse(killed_indices.begin(), killed_indices.end());
    for (auto &index : killed_indices) {
        moving_objects.erase(moving_objects.begin() + index);
    }

    if (coin_count != prev_coin_count) {
        coins->changeText(std::to_string(coin_count) + " COINS");
        update = true;
        update_count = 2;
    }
    // if player is > 0.7 of playground, move everything left
    auto playerX = mario->getRect().x;
    auto width = scene->getWidth();
    auto rightBarrier = width * 0.5;
    auto rightmostX =
        scene->rightmost()->getRect().x + scene->rightmost()->getRect().w;
    scene->moveEverything((playerX > rightBarrier && rightmostX > width) *
                              (rightBarrier - playerX) / width,
                          0);
    update = update || (playerX > rightBarrier && rightmostX > width);
    global_frames++;
    if (mario->isDead()) {
        g_death = true;
    }
}

void doInput() {
    FPSmanager gFPS;
    SDL_initFramerate(&gFPS);
    SDL_setFramerate(&gFPS, 200);
    while (!g_quit) {
        SDL_framerateDelay(&gFPS);
        std::lock_guard<std::mutex> lock(gamescene_mutex);
        game_scenes.back().doInput(game_scenes.back().scene);
        game_scenes.back().scene->updateScene();
    }
}

void mainGameAdditional(std::shared_ptr<SDLPP::Scene> & /*UNUSED*/) {
    static auto base = SDL_GetTicks();
    static int frames = 0;
    mario->setStanding();
    frames++;
    if (SDL_GetTicks() - base >= 1000) {
        if (global_frames < frames) {
            frames = global_frames;
        }
        global_frames = 0;
        fps->changeText(std::to_string(frames) + " fps");
        frames = 0;
        base = SDL_GetTicks();
    }
}

SceneStruct mainGameScene(const std::string &level_path) {
    auto scene = std::make_shared<SDLPP::Scene>(renderer);
    g_playground = scene;
    auto bg = std::make_shared<SDLPP::RectangleRender>(
        0, 0, 10, 10, renderer, MARIO_OVERWORLD_COLORKEY, true);
    bg->setPermanent();
    bg->setStatic();
    bg->setId(1);
    scene->addObject(bg);

    mario.reset();
    mario = std::make_shared<Mario>(renderer);
    scene->addObject(mario);

    auto defeat =
        std::make_shared<SDLPP::RectangleRender>(0, 1.01, 0, 0, renderer);
    defeat->setId(DEATH_ID);
    defeat->setAlignment(SDLPP::OBJ_CENTER, SDLPP::OBJ_CENTER);
    defeat->setPermanent();
    auto defeatCol = SDLPP::RectColider(-1, 0, -1, -1);
    defeatCol.setInfinite();
    defeat->addCollision(defeatCol);

    scene->addObject(defeat);

    leftStop =
        std::make_shared<SDLPP::RectangleRender>(-0.1, 0, 0.11, 0, renderer);
    leftStop->setId(STOP_MOVEMENT);
    leftStop->setAlignment(SDLPP::OBJ_CENTER, SDLPP::OBJ_CENTER);
    leftStop->setPermanent();
    auto leftStopCol = SDLPP::RectColider(0, -1, 1, -1);
    leftStopCol.setInfinite();
    leftStop->addCollision(leftStopCol);
    leftStop->setColiderColor("#FF00FF");
    scene->addObject(leftStop);

    loadMap(scene, mario, level_path);

    auto font = std::make_shared<SDLPP::Font>("testfont.ttf", 36);
    fps = std::make_shared<SDLPP::TextRenderer>(
        0.2, 0, 0.78, 0.1, renderer, font, "0fps", "#FFFFFF", "#000000", 0.1,
        SDLPP_TEXT_RIGHT);
    fps->setAlignment(SDLPP::OBJ_END, SDLPP::OBJ_START);
    fps->setId(0);
    fps->setPermanent();
    fps->setHidden(true);
    scene->addObject(fps);

    coins = std::make_shared<SDLPP::TextRenderer>(
        0.2, 0, 0.78, 0.1, renderer, font, "0 COINS", "#FFFFFF", "#000000", 0.1,
        SDLPP_TEXT_RIGHT);
    coins->setAlignment(SDLPP::OBJ_START, SDLPP::OBJ_START);
    coins->setId(0);
    coins->setPermanent();
    scene->addObject(coins);
    scene->moveEverything(-mario->getDoubleRect().first.getX() + 0.2, 0);

    std::unordered_set<uint64_t> background_ids = {
        HILL_INCLINE_ID,      HILL_DECLINE_ID,        HILL_DOTS_RIGHT_ID,
        HILL_DOTS_LEFT_ID,    HILL_FILL_ID,           HILL_TOP_ID,
        BUSH_LEFT_ID,         BUSH_MIDDLE_ID,         BUSH_RIGHT_ID,
        CLOUD_LEFT_BOTTOM_ID, CLOUD_MIDDLE_BOTTOM_ID, CLOUD_RIGHT_BOTTOM_ID,
        CLOUD_LEFT_TOP_ID,    CLOUD_MIDDLE_TOP_ID,    CLOUD_RIGHT_TOP_ID,
        CASTLE_LEFT_ID,       CASTLE_RIGHT_ID,        CASTLE_BLACK_ID,
        CASTLE_ENTRY_ID,      CASTLE_TOWER_ID,        CASTLE_TOWER_FILLED_ID,
        WATER_TOP_ID,         WATER_FILL_ID
    };
    scene->setBackgroundObjectIDs(background_ids);
    scene->updateBackgroundObjectZIndex();

    // we want mario to be first because visiting isn't perfect
    moving_objects.clear();
    moving_objects.push_back(mario);
    std::unordered_set<int> moving_object_ids = {
        GOOMBA_ID,
    };
    for (auto &obj : scene->getObjects(moving_object_ids)) {
        moving_objects.push_back(std::dynamic_pointer_cast<MarioBlock>(obj));
    }

    SceneStruct ret{};
    ret.scene = scene;
    ret.doInput = doInputMainGame;
    ret.additionalRender = mainGameAdditional;

    return ret;
}

void loadLevel(const std::string &level) {
    // std::lock_guard<std::mutex> lock(render_mutex);
    coin_count = 0;
    std::lock_guard<std::mutex> lock(gamescene_mutex);
    for (auto &scene : game_scenes) {
        scene.scene->resetScene();
    }
    game_scenes.clear();
    game_scenes.push_back(mainGameScene("levels/" + level));
    game_scenes.back().scene->updateSizeAndPosition();
    update = true;
    newLoaded = true;
    update_count = 2;
    last_load_level = level;
    g_death = false;
}

void loadLastLevel() {
    if (last_load_level != "") {
        loadLevel(last_load_level);
    }
}

#ifdef _WIN32
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PWSTR szCmdLine, int nCmdShow) {
#else
int main() {
#endif
    SDLPP::init();
    SDLPP::Window w("Mario clone!");
    w.setResizable(true);

    renderer = std::make_shared<SDLPP::Renderer>(w);
    renderer->setBlendMode(SDL_BLENDMODE_BLEND);

    // prepare global vars
    g_terrain_texture = std::make_shared<SDLPP::Texture>(
        renderer, "sprites/terrain.png", MARIO_OVERWORLD_COLORKEY);
    g_enemies_texture = std::make_shared<SDLPP::Texture>(
        renderer, "sprites/enemies.png", MARIO_OVERWORLD_COLORKEY);

    g_mario_texture = std::make_shared<SDLPP::Texture>(
        renderer, "sprites/mario.png", MARIO_OVERWORLD_COLORKEY);
    g_translucent_terrain_texture = std::make_shared<SDLPP::Texture>(
        renderer, "sprites/terrain.png", MARIO_OVERWORLD_COLORKEY);
    g_translucent_terrain_texture->setAlpha(100);

    FPSmanager gFPS;
    SDL_initFramerate(&gFPS);
    SDL_setFramerate(&gFPS, 60);

    auto font = std::make_shared<SDLPP::Font>("testfont.ttf", 36);
    g_text_config = std::make_shared<SDLPP::FontConfiguration>(font, "#FFFFFF",
                                                               "#000000", 0.15);
    game_scenes.push_back(
        createGameMainMenuScene(renderer, false, false, false));

    std::thread inputThread(doInput);
    SDL_PumpEvents();
    game_scenes.back().scene->updateSizeAndPosition();
    game_scenes.back().scene->renderScene();
    renderer->presentRenderer();

    update = true;
    while (!g_quit) {
        SDL_framerateDelay(&gFPS);
        SDL_PumpEvents();
        std::lock_guard<std::mutex> lock(render_mutex);
        if (update) {
            for (auto &scene : game_scenes) {
                scene.scene->updateSizeAndPosition();
            }
            if (update_count > 0) {
                update_count--;
            } else {
                update = false;
            }
        }
        auto max_game_scenes = game_scenes.size();
        renderer->clearRenderer();
        for (size_t i = 0; i < max_game_scenes; i++) {
            game_scenes[i].additionalRender(game_scenes[i].scene);
            // additional renderer can remove scene from game_scenes, better
            // check
            if (i < game_scenes.size()) {
                game_scenes[i].scene->renderScene(false);
            }
        }
        renderer->presentRenderer();
    }
    inputThread.join();

    return 0;
}