#pragma once

#include "pch.h"
#include "SVGLength.h"

#include <JSValueReader.h>

namespace winrt::Microsoft::ReactNative {

void WriteValue(IJSValueWriter const &writer, const winrt::RNSVG::SVGLength &value) noexcept {
  switch (value.Unit) {
    case RNSVG::LengthType::Unknown:
      writer.WriteNull();
      return;
    case RNSVG::LengthType::EMS:
      writer.WriteString(winrt::to_hstring(std::to_string(value.Value) + "em"));
      return;
    case RNSVG::LengthType::EXS:
      writer.WriteString(winrt::to_hstring(std::to_string(value.Value) + "ex"));
      return;
    case RNSVG::LengthType::Centimeter:
      writer.WriteString(winrt::to_hstring(std::to_string(value.Value) + "cm"));
      return;
    case RNSVG::LengthType::Millimeter:
      writer.WriteString(winrt::to_hstring(std::to_string(value.Value) + "mm"));
      return;
    case RNSVG::LengthType::Inch:
      writer.WriteString(winrt::to_hstring(std::to_string(value.Value) + "in"));
      return;
    case RNSVG::LengthType::Point:
      writer.WriteString(winrt::to_hstring(std::to_string(value.Value) + "pt"));
      return;
    case RNSVG::LengthType::Pica:
      writer.WriteString(winrt::to_hstring(std::to_string(value.Value) + "pc"));
      return;
    case RNSVG::LengthType::Number:
      writer.WriteDouble(value.Value);
      return;
    default:
      assert(false);
  }
}

void ReadValue(IJSValueReader const &reader, /*out*/ winrt::RNSVG::SVGLength &value) noexcept {
  switch (reader.ValueType()) {
    case JSValueType::String: {
      auto str = to_string(reader.GetString());

      auto strLength{str.size()};
      if (strLength == 0 || str == "normal") {
        value.Unit = RNSVG::LengthType::Unknown;
        value.Value = 0.0;
        return;
      } else if (str.back() == '%') {
        value.Unit = RNSVG::LengthType::Percentage;
        value.Value = std::stof(str.substr(0, strLength - 1), nullptr);
        return;
      } else if (strLength > 2) {
        auto end{strLength - 2};
        auto lastTwo{str.substr(end)};

        value.Unit = RNSVG::LengthType::Unknown;
        if (lastTwo == "px") {
          value.Unit = RNSVG::LengthType::Number;
        } else if (lastTwo == "em") {
          value.Unit = RNSVG::LengthType::EMS;
        } else if (lastTwo == "ex") {
          value.Unit = RNSVG::LengthType::EXS;
        } else if (lastTwo == "cm") {
          value.Unit = RNSVG::LengthType::Centimeter;
        } else if (lastTwo == "mm") {
          value.Unit = RNSVG::LengthType::Millimeter;
        } else if (lastTwo == "in") {
          value.Unit = RNSVG::LengthType::Inch;
        } else if (lastTwo == "pt") {
          value.Unit = RNSVG::LengthType::Point;
        } else if (lastTwo == "pc") {
          value.Unit = RNSVG::LengthType::Pica;
        } else {
          value.Unit = RNSVG::LengthType::Number;
          end = strLength;
        }

        value.Value = std::stof(str.substr(0, end), nullptr);
        return;
      }

      value.Unit = RNSVG::LengthType::Number;
      value.Value = std::stof(str, nullptr);
    }
      return;
    case JSValueType::Int64:
      value.Unit = RNSVG::LengthType::Number;
      value.Value = static_cast<float>(reader.GetInt64());
      return;
    case JSValueType::Double:
      value.Unit = RNSVG::LengthType::Number;
      value.Value = static_cast<float>(reader.GetDouble());
      return;
    default:
      value.Unit = RNSVG::LengthType::Unknown;
      value.Value = 0.0f;
      return;
  }
}


} // namespace winrt::Microsoft::ReactNative

namespace winrt::RNSVG {

D2D1_SVG_LENGTH D2dSvgLength(const winrt::RNSVG::SVGLength &value) noexcept {
  switch (value.Unit) {
    case RNSVG::LengthType::Percentage:
      return {value.Value, D2D1_SVG_LENGTH_UNITS::D2D1_SVG_LENGTH_UNITS_PERCENTAGE};
    case RNSVG::LengthType::Unknown:
    case RNSVG::LengthType::EMS:
    case RNSVG::LengthType::EXS:
    case RNSVG::LengthType::Centimeter:
    case RNSVG::LengthType::Millimeter:
    case RNSVG::LengthType::Inch:
    case RNSVG::LengthType::Point:
    case RNSVG::LengthType::Pica:
    default:
      // Unsupported unit type
      __fallthrough;
    case RNSVG::LengthType::Number:
      return {value.Value, D2D1_SVG_LENGTH_UNITS::D2D1_SVG_LENGTH_UNITS_NUMBER};
  }
}
} // namespace winrt::RNSVG