#include "render.hpp"
#include "ansi_parser.hpp"
#include <cmath>
#include <fmt/core.h>
#include <array>
#include "map.hpp"
#include <iostream>
#include "color.hpp"

using namespace fmt;

SFMLRender::SFMLRender() :
  $window(sf::VideoMode(VIDEO_X,VIDEO_Y), "Roguish"),
  $map_font_size(0),
  $line_spacing(0),
  $default_fg(color::LIGHT_MID),
  $default_bg(color::BLACK),
  $ansi($default_fg, $default_bg)
{
  // force true color, but maybe I want to support different color sets
  $font.loadFromFile("./assets/text.otf");
  $font.setSmooth(false);
  $ui_text.setFont($font);
  $ui_text.setPosition(0,0);
  $ui_text.setCharacterSize(UI_FONT_SIZE);
  $ui_text.setFillColor(color::LIGHT_MID);
  sf::Glyph glyph = $font.getGlyph(UI_BASE_CHAR, UI_FONT_SIZE, false);
  $ui_bounds = glyph.bounds;
}

sf::Sprite &SFMLRender::get_text_sprite(wchar_t tile) {
  if(!$sprites.contains(tile)) {
    sf::Glyph glyph = $font.getGlyph(tile, $map_font_size, false);
    // WARNING! we actually have to do this here because SFML caches
    // the glyphs on the font texture, so this gets loaded each time
    // we get a new glyph from the font.
    $font_texture = $font.getTexture($map_font_size);
    sf::Sprite sprite($font_texture);
    sprite.setTextureRect(glyph.textureRect);
    $sprites[tile] = sprite;
  }

  return $sprites[tile];
}

inline bool base_glyph_check(sf::Font &font, sf::Glyph &base_glyph, Point &view_port, int &font_size, int new_size) {
  auto glyph = font.getGlyph(BG_TILE, new_size, false);

  int view_x = std::ceil((VIDEO_X - GAME_MAP_POS) / glyph.bounds.width);
  int view_y = std::ceil(VIDEO_Y / glyph.bounds.height);

  // don't allow resizing beyond/below game map size
  if(view_x <= GAME_MAP_X && view_y <= GAME_MAP_Y) {
    // looks good, set 'em all
    base_glyph = glyph;
    view_port = {size_t(view_x), size_t(view_y)};
    font_size = new_size;
    return true;
  } else {
    return false;
  }
}


bool SFMLRender::resize_map(int new_size, Point &view_port) {
  if($map_font_size == new_size || new_size < MIN_FONT_SIZE || new_size > MAX_FONT_SIZE) return false;

  if(base_glyph_check($font, $base_glyph, view_port, $map_font_size, new_size)) {
    $sprites.clear(); // need to reset the sprites for the new size
    $line_spacing = $font.getLineSpacing($map_font_size);
    $bg_sprite = get_text_sprite(BG_TILE);
    $bg_bounds = $bg_sprite.getLocalBounds();
    return true;
  } else {
    // something else here
    return false;
  }
}

inline void configure_tile(const sf::Sprite &sprite, sf::FloatRect &sp_bounds,  sf::FloatRect bg_bounds, float &width_delta, float &height_delta) {
  // should look into caching all this instead of calcing it each time
  sp_bounds = sprite.getLocalBounds();

  // calculate where to center the sprite, but only if it's smaller
  width_delta = bg_bounds.width > sp_bounds.width ? (bg_bounds.width - sp_bounds.width) / 2 : 0;
  height_delta = bg_bounds.height > sp_bounds.width ? (bg_bounds.height - sp_bounds.height) / 2 : 0;
}

void SFMLRender::render_grid(const std::wstring &text, float x, float y) {
  wchar_t last_tile = '#';
  sf::FloatRect sp_bounds;
  float width_delta = 0;
  float height_delta = 0;
  sf::Sprite &sprite = get_text_sprite(last_tile);
  const float start_x = x;
  sf::Color cur_fg = $default_fg;

  // make a copy so we don't modify the cached one
  $ansi.parse(text, [&](sf::Color fg, sf::Color bg) {
      cur_fg = fg;
      $bg_sprite.setColor(bg);
    },

    [&](wchar_t tile) {
      switch(tile) {
        case '\r': break; // ignore it
        case '\n': {
            // don't bother processing newlines, just skip
            y += $line_spacing;
            x = start_x;
          }
          break;
        default: {
          $bg_sprite.setPosition({x, y});

          // only get a new sprite if the tile changed
          if(last_tile != tile) {
            last_tile = tile; // update last tile seen
            sprite = get_text_sprite(tile);
            configure_tile(sprite, sp_bounds, $bg_bounds, width_delta, height_delta);
          }

          sprite.setPosition({x+width_delta, y+height_delta});
          sprite.setColor(cur_fg);

          $window.draw($bg_sprite);
          $window.draw(sprite);
          // next cell
          x += $base_glyph.advance;
        }
      }
  });
}

inline sf::FloatRect draw_chunk(sf::RenderWindow& window,
    sf::FloatRect ui_bounds, sf::Text& text,
    sf::Color bgcolor, float x, float y, std::wstring &out)
{
  text.setString(out);
  text.setPosition({x, y});
  // get a base character for the cell size
  sf::FloatRect bounds(x, y, ui_bounds.width * out.size(), ui_bounds.height);
  sf::RectangleShape backing({bounds.width, bounds.height});
  backing.setFillColor(bgcolor);
  backing.setPosition({bounds.left, bounds.top + BG_BOX_OFFSET});
#ifdef DEBUG
  backing.setOutlineColor(int(y) % 4 ? sf::Color::Red : sf::Color::Yellow);
  backing.setOutlineThickness(1);
#endif
  window.draw(backing);
  window.draw(text);
  out.clear();
  return bounds;
}

void SFMLRender::render_text(const std::wstring &text, float start_x, float start_y) {
  std::wstring out;
  float x = start_x;
  float y = start_y;
  sf::Color bgcolor = $default_bg;

  // start with the default_fg until it's changed
  $ui_text.setFillColor($default_fg);

  $ansi.parse(text,
    [&](sf::Color fg, sf::Color bg) {
        if(out.size() > 0 ) {
          auto bounds = draw_chunk($window, $ui_bounds, $ui_text, bgcolor, x, y, out);
          x += bounds.width;
        }
        bgcolor = bg;
        $ui_text.setFillColor(fg);
    },
    [&](wchar_t tile) {
      switch(tile) {
        case '\r': break; // ignore it
        case '\n': {
          sf::FloatRect bounds;

          if(out.size() > 0) {
            bounds = draw_chunk($window, $ui_bounds, $ui_text, bgcolor, x, y, out);
          } else {
            bounds = $ui_text.getLocalBounds();
          }

          y += bounds.height;
          x = start_x; // reset to the original position
        }
        break;
        default:
          out += tile;
          break;
      }
    }
  );

  if(out.size() > 0) {
    draw_chunk($window, $ui_bounds, $ui_text, bgcolor, x, y, out);
  }
}

void SFMLRender::draw(Panel &panel, float x_offset, float y_offset) {
  panel.render();
  const std::wstring &panelout = panel.to_string();

  if(panel.grid) {
    render_grid(panelout, panel.x + x_offset, panel.y + y_offset);
  } else {
    sf::RectangleShape backing(
        sf::Vector2f($ui_bounds.width * panel.width + panel.border_px,
          $ui_bounds.height * panel.height + panel.border_px));

    backing.setFillColor(panel.default_bg);

    if(panel.has_border) {
      backing.setOutlineColor(panel.border_color);
      backing.setOutlineThickness(panel.border_px);
    }

    backing.setPosition(panel.x + x_offset, panel.y + y_offset);
    $window.draw(backing);
    render_text(panelout, panel.x, panel.y);
  }
}