#include "text.h"

#include <SDL3/SDL.h>  // Para Uint8, SDL_GetRenderTarget, SDL_RenderClear, SDL_SetRenderDrawColor, SDL_SetRenderTarget, SDL_FRect, SDL_BLENDMODE_BLEND, SDL_PixelFormat, SDL_TextureAccess

#include <fstream>      // Para basic_ifstream, basic_istream, basic_ostream, operator<<, endl, ifstream
#include <iostream>     // Para cerr
#include <stdexcept>    // Para runtime_error
#include <string_view>  // Para string_view

#include "color.h"    // Para Color
#include "screen.h"   // Para Screen
#include "sprite.h"   // Para Sprite
#include "texture.h"  // Para Texture
#include "utils.h"    // Para getFileName, printWithDots

// Constructor
Text::Text(const std::shared_ptr<Texture> &texture, const std::string &text_file) {
    // Carga los offsets desde el fichero
    auto tf = loadFile(text_file);

    // Inicializa variables desde la estructura
    box_height_ = tf->box_height;
    box_width_ = tf->box_width;
    for (int i = 0; i < 128; ++i) {
        offset_[i].x = tf->offset[i].x;
        offset_[i].y = tf->offset[i].y;
        offset_[i].w = tf->offset[i].w;
    }

    // Crea los objetos
    sprite_ = std::make_unique<Sprite>(texture, (SDL_FRect){0, 0, static_cast<float>(box_width_), static_cast<float>(box_height_)});

    // Inicializa variables
    fixed_width_ = false;
}

// Constructor
Text::Text(const std::shared_ptr<Texture> &texture, const std::shared_ptr<Text::File> &text_file) {
    // Inicializa variables desde la estructura
    box_height_ = text_file->box_height;
    box_width_ = text_file->box_width;
    for (int i = 0; i < 128; ++i) {
        offset_[i].x = text_file->offset[i].x;
        offset_[i].y = text_file->offset[i].y;
        offset_[i].w = text_file->offset[i].w;
    }

    // Crea los objetos
    sprite_ = std::make_unique<Sprite>(texture, (SDL_FRect){0, 0, static_cast<float>(box_width_), static_cast<float>(box_height_)});

    // Inicializa variables
    fixed_width_ = false;
}

// Escribe texto en pantalla
void Text::write(int x, int y, const std::string &text, int kerning, int length) {
    int shift = 0;
    const std::string_view VISIBLE_TEXT = (length == -1) ? std::string_view(text) : std::string_view(text).substr(0, length);

    sprite_->setY(y);
    for (const auto CH : VISIBLE_TEXT) {
        const auto INDEX = static_cast<unsigned char>(CH);

        if (INDEX < offset_.size()) {
            sprite_->setSpriteClip(offset_[INDEX].x, offset_[INDEX].y, box_width_, box_height_);
            sprite_->setX(x + shift);
            sprite_->render();
            shift += offset_[INDEX].w + kerning;
        }
    }
}

// Escribe el texto al doble de tamaño
void Text::write2X(int x, int y, const std::string &text, int kerning, int length) {
    int shift = 0;
    const std::string_view VISIBLE_TEXT = (length == -1) ? std::string_view(text) : std::string_view(text).substr(0, length);

    for (const auto CH : VISIBLE_TEXT) {
        const auto INDEX = static_cast<unsigned char>(CH);

        if (INDEX < offset_.size()) {
            SDL_FRect rect = {
                static_cast<float>(offset_[INDEX].x),
                static_cast<float>(offset_[INDEX].y),
                static_cast<float>(box_width_),
                static_cast<float>(box_height_)};

            sprite_->getTexture()->render(x + shift, y, &rect, 2.0F, 2.0F);
            shift += (offset_[INDEX].w + kerning) * 2;
        }
    }
}

// Escribe el texto en una textura
auto Text::writeToTexture(const std::string &text, int zoom, int kerning, int length) -> std::shared_ptr<Texture> {
    auto *renderer = Screen::get()->getRenderer();
    auto texture = std::make_shared<Texture>(renderer);
    auto width = Text::length(text, kerning) * zoom;
    auto height = box_height_ * zoom;
    auto *temp = SDL_GetRenderTarget(renderer);

    texture->createBlank(width, height, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET);
    texture->setBlendMode(SDL_BLENDMODE_BLEND);
    texture->setAsRenderTarget(renderer);
    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
    SDL_RenderClear(renderer);
    zoom == 1 ? write(0, 0, text, kerning) : write2X(0, 0, text, kerning);
    SDL_SetRenderTarget(renderer, temp);

    return texture;
}

// Escribe el texto con extras en una textura
auto Text::writeDXToTexture(Uint8 flags, const std::string &text, int kerning, Color text_color, Uint8 shadow_distance, Color shadow_color, int length) -> std::shared_ptr<Texture> {
    auto *renderer = Screen::get()->getRenderer();
    auto texture = std::make_shared<Texture>(renderer);
    auto width = Text::length(text, kerning) + shadow_distance;
    auto height = box_height_ + shadow_distance;
    auto *temp = SDL_GetRenderTarget(renderer);

    texture->createBlank(width, height, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET);
    texture->setBlendMode(SDL_BLENDMODE_BLEND);
    texture->setAsRenderTarget(renderer);
    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
    SDL_RenderClear(renderer);
    writeDX(flags, 0, 0, text, kerning, text_color, shadow_distance, shadow_color, length);
    SDL_SetRenderTarget(renderer, temp);

    return texture;
}

// Escribe el texto con colores
void Text::writeColored(int x, int y, const std::string &text, Color color, int kerning, int length) {
    sprite_->getTexture()->setColor(color.r, color.g, color.b);
    write(x, y, text, kerning, length);
    sprite_->getTexture()->setColor(255, 255, 255);
}

// Escribe el texto con sombra
void Text::writeShadowed(int x, int y, const std::string &text, Color color, Uint8 shadow_distance, int kerning, int length) {
    writeDX(Text::SHADOW, x, y, text, kerning, color, shadow_distance, color, length);
    write(x, y, text, kerning, length);  // Dibuja el texto principal encima
}

// Escribe el texto centrado en un punto x
void Text::writeCentered(int x, int y, const std::string &text, int kerning, int length) {
    x -= (Text::length(text, kerning) / 2);
    write(x, y, text, kerning, length);
}

// Escribe texto con extras
void Text::writeDX(Uint8 flags, int x, int y, const std::string &text, int kerning, Color text_color, Uint8 shadow_distance, Color shadow_color, int length) {
    const auto CENTERED = ((flags & Text::CENTER) == Text::CENTER);
    const auto SHADOWED = ((flags & Text::SHADOW) == Text::SHADOW);
    const auto COLORED = ((flags & Text::COLOR) == Text::COLOR);
    const auto STROKED = ((flags & Text::STROKE) == Text::STROKE);

    if (CENTERED) {
        x -= (Text::length(text, kerning) / 2);
    }

    if (SHADOWED) {
        writeColored(x + shadow_distance, y + shadow_distance, text, shadow_color, kerning, length);
    }

    if (STROKED) {
        for (int dist = 1; dist <= shadow_distance; ++dist) {
            for (int dy = -dist; dy <= dist; ++dy) {
                for (int dx = -dist; dx <= dist; ++dx) {
                    writeColored(x + dx, y + dy, text, shadow_color, kerning, length);
                }
            }
        }
    }

    if (COLORED) {
        writeColored(x, y, text, text_color, kerning, length);
    } else {
        write(x, y, text, kerning, length);
    }
}

// Escribe texto a partir de un TextStyle
void Text::writeStyle(int x, int y, const std::string &text, const Style &style, int length) {
    writeDX(style.flags, x, y, text, style.kerning, style.text_color, style.shadow_distance, style.shadow_color);
}

// Obtiene la longitud en pixels de una cadena
auto Text::length(const std::string &text, int kerning) const -> int {
    int shift = 0;
    for (const auto &ch : text) {
        // Convertimos a unsigned char para obtener el valor ASCII correcto (0-255)
        const auto INDEX = static_cast<unsigned char>(ch);

        // Verificamos si el carácter está dentro de los límites del array
        if (INDEX < offset_.size()) {
            shift += (offset_[INDEX].w + kerning);
        }
    }

    // Descuenta el kerning del último caracter si el texto no está vacío
    return text.empty() ? 0 : shift - kerning;
}

// Devuelve el valor de la variable
auto Text::getCharacterSize() const -> int {
    return box_width_;
}

// Establece si se usa un tamaño fijo de letra
void Text::setFixedWidth(bool value) {
    fixed_width_ = value;
}

// Llena una estructuta TextFile desde un fichero
auto Text::loadFile(const std::string &file_path) -> std::shared_ptr<Text::File> {
    auto tf = std::make_shared<Text::File>();

    // Inicializa a cero el vector con las coordenadas
    for (auto &i : tf->offset) {
        i.x = 0;
        i.y = 0;
        i.w = 0;
        tf->box_width = 0;
        tf->box_height = 0;
    }

    // Abre el fichero para leer los valores
    std::ifstream file(file_path);

    if (file.is_open() && file.good()) {
        std::string buffer;

        // Lee los dos primeros valores del fichero
        std::getline(file, buffer);
        std::getline(file, buffer);
        tf->box_width = std::stoi(buffer);

        std::getline(file, buffer);
        std::getline(file, buffer);
        tf->box_height = std::stoi(buffer);

        // lee el resto de datos del fichero
        auto index = 32;
        auto line_read = 0;
        while (std::getline(file, buffer)) {
            // Almacena solo las lineas impares
            if (line_read % 2 == 1) {
                tf->offset[index++].w = std::stoi(buffer);
            }

            // Limpia el buffer
            buffer.clear();
            line_read++;
        };

        // Cierra el fichero
        printWithDots("Text File : ", getFileName(file_path), "[ LOADED ]");
        file.close();
    }

    // El fichero no se puede abrir
    else {
        std::cerr << "Error: Fichero no encontrado " << getFileName(file_path) << '\n';
        throw std::runtime_error("Fichero no encontrado: " + getFileName(file_path));
    }

    // Establece las coordenadas para cada caracter ascii de la cadena y su ancho
    for (int i = 32; i < 128; ++i) {
        tf->offset[i].x = ((i - 32) % 15) * tf->box_width;
        tf->offset[i].y = ((i - 32) / 15) * tf->box_height;
    }

    return tf;
}