#include <utility>

#include "drawtypes/label.hpp"
#include "utils/factory.hpp"

POLYBAR_NS

namespace drawtypes {
  string label::get() const {
    return m_tokenized;
  }

  label::operator bool() {
    return !m_tokenized.empty();
  }

  label_t label::clone() {
    vector<token> tokens;
    if (!m_tokens.empty()) {
      std::back_insert_iterator<decltype(tokens)> back_it(tokens);
      std::copy(m_tokens.begin(), m_tokens.end(), back_it);
    }
    return factory_util::shared<label>(m_text, m_foreground, m_background, m_underline, m_overline, m_font, m_padding,
        m_margin, m_maxlen, m_ellipsis, move(tokens));
  }

  void label::reset_tokens() {
    m_tokenized = m_text;
  }

  bool label::has_token(const string& token) {
    return m_text.find(token) != string::npos;
  }

  void label::replace_token(const string& token, string replacement) {
    if (!has_token(token)) {
      return;
    }

    for (auto&& tok : m_tokens) {
      if (token == tok.token) {
        if (tok.max != 0_z && replacement.length() > tok.max) {
          replacement = replacement.erase(tok.max) + tok.suffix;
        } else if (tok.min != 0_z && replacement.length() < tok.min) {
          replacement.insert(0_z, tok.min - replacement.length(), ' ');
        }
        m_tokenized = string_util::replace_all(m_tokenized, token, move(replacement));
      }
    }
  }

  void label::replace_defined_values(const label_t& label) {
    if (!label->m_foreground.empty()) {
      m_foreground = label->m_foreground;
    }
    if (!label->m_background.empty()) {
      m_background = label->m_background;
    }
    if (!label->m_underline.empty()) {
      m_underline = label->m_underline;
    }
    if (!label->m_overline.empty()) {
      m_overline = label->m_overline;
    }
    if (label->m_font != 0) {
      m_font = label->m_font;
    }
    if (label->m_padding.left != 0U) {
      m_padding.left = label->m_padding.left;
    }
    if (label->m_padding.right != 0U) {
      m_padding.right = label->m_padding.right;
    }
    if (label->m_margin.left != 0U) {
      m_margin.left = label->m_margin.left;
    }
    if (label->m_margin.right != 0U) {
      m_margin.right = label->m_margin.right;
    }
    if (label->m_maxlen != 0_z) {
      m_maxlen = label->m_maxlen;
      m_ellipsis = label->m_ellipsis;
    }
  }

  void label::copy_undefined(const label_t& label) {
    if (m_foreground.empty() && !label->m_foreground.empty()) {
      m_foreground = label->m_foreground;
    }
    if (m_background.empty() && !label->m_background.empty()) {
      m_background = label->m_background;
    }
    if (m_underline.empty() && !label->m_underline.empty()) {
      m_underline = label->m_underline;
    }
    if (m_overline.empty() && !label->m_overline.empty()) {
      m_overline = label->m_overline;
    }
    if (m_font == 0 && label->m_font != 0) {
      m_font = label->m_font;
    }
    if (m_padding.left == 0U && label->m_padding.left != 0U) {
      m_padding.left = label->m_padding.left;
    }
    if (m_padding.right == 0U && label->m_padding.right != 0U) {
      m_padding.right = label->m_padding.right;
    }
    if (m_margin.left == 0U && label->m_margin.left != 0U) {
      m_margin.left = label->m_margin.left;
    }
    if (m_margin.right == 0U && label->m_margin.right != 0U) {
      m_margin.right = label->m_margin.right;
    }
    if (m_maxlen == 0_z && label->m_maxlen != 0_z) {
      m_maxlen = label->m_maxlen;
      m_ellipsis = label->m_ellipsis;
    }
  }

  /**
   * Create a label by loading values from the configuration
   */
  label_t load_label(const config& conf, const string& section, string name, bool required, string def) {
    vector<token> tokens;
    size_t start, end, pos;

    name = string_util::ltrim(string_util::rtrim(move(name), '>'), '<');

    string text;

    struct side_values padding {
    }, margin{};

    if (required) {
      text = conf.get(section, name);
    } else {
      text = conf.get(section, name, move(def));
    }

    size_t len{text.size()};

    if (len > 2 && text[0] == '"' && text[len - 1] == '"') {
      text = text.substr(1, len - 2);
    }

    const auto get_left_right = [&](string key) {
      auto value = conf.get(section, key, 0U);
      auto left = conf.get(section, key + "-left", value);
      auto right = conf.get(section, key + "-right", value);
      return side_values{static_cast<uint16_t>(left), static_cast<uint16_t>(right)};
    };

    padding = get_left_right(name + "-padding");
    margin = get_left_right(name + "-margin");

    string line{text};

    while ((start = line.find('%')) != string::npos && (end = line.find('%', start + 1)) != string::npos) {
      auto token_str = line.substr(start, end - start + 1);

      // ignore false positives (lemonbar-style declarations)
      if (token_str[1] == '{') {
        line.erase(0, start + 1);
        continue;
      }

      line.erase(start, end - start + 1);
      tokens.emplace_back(token{token_str, 0_z, 0_z});
      auto& token = tokens.back();

      // find min delimiter
      if ((pos = token_str.find(':')) == string::npos) {
        continue;
      }

      // strip min/max specifiers from the label string token
      token.token = token_str.substr(0, pos) + '%';
      text = string_util::replace(text, token_str, token.token);

      try {
        token.min = std::stoul(&token_str[pos + 1], nullptr, 10);
      } catch (const std::invalid_argument& err) {
        continue;
      }

      // find max delimiter
      if ((pos = token_str.find(':', pos + 1)) == string::npos) {
        continue;
      }

      try {
        token.max = std::stoul(&token_str[pos + 1], nullptr, 10);
      } catch (const std::invalid_argument& err) {
        continue;
      }

      // ignore max lengths less than min
      if (token.max < token.min) {
        token.max = 0_z;
      }

      // find suffix delimiter
      if ((pos = token_str.find(':', pos + 1)) != string::npos) {
        token.suffix = token_str.substr(pos + 1, end - pos - 1);
      }
    }

    // clang-format off
    return factory_util::shared<label>(text,
        conf.get(section, name + "-foreground", ""s),
        conf.get(section, name + "-background", ""s),
        conf.get(section, name + "-underline", ""s),
        conf.get(section, name + "-overline", ""s),
        conf.get(section, name + "-font", 0),
        padding,
        margin,
        conf.get(section, name + "-maxlen", 0_z),
        conf.get(section, name + "-ellipsis", true),
        move(tokens));
    // clang-format on
  }

  /**
   * Create a label by loading optional values from the configuration
   */
  label_t load_optional_label(const config& conf, string section, string name, string def) {
    return load_label(conf, move(section), move(name), false, move(def));
  }

  /**
   * Create an icon by loading values from the configuration
   */
  icon_t load_icon(const config& conf, string section, string name, bool required, string def) {
    return load_label(conf, move(section), move(name), required, move(def));
  }

  /**
   * Create an icon by loading optional values from the configuration
   */
  icon_t load_optional_icon(const config& conf, string section, string name, string def) {
    return load_icon(conf, move(section), move(name), false, move(def));
  }
}

POLYBAR_NS_END