import chroma from "chroma-js";
import dayjs from "dayjs";
import relativeTimePlugin from "dayjs/plugin/relativeTime";
import utcPlugin from "dayjs/plugin/utc";

dayjs.extend(relativeTimePlugin);
dayjs.extend(utcPlugin);

const isDark = color => {
  // YIQ equation from http://24ways.org/2010/calculating-color-contrast
  const rgb = chroma(color).rgb();
  const yiq = (rgb[0] * 299 + rgb[1] * 587 + rgb[2] * 114) / 1000;
  return yiq < 128;
};

const isLight = color => isDark(color);

const opposingColor = (theme, color) => {
  if (color.match(/^\w+\.\d+$/m)) {
    const colorParts = color.split(".");
    if (colorParts.length !== 2) {
      throw Error(`Color is improperly formatted. Got '${color}'`);
    }
    const [colorName, colorOpacity] = colorParts;
    color = theme.colors[colorName][colorOpacity];
  }
  const opposing = isDark(color) ? theme.colors.white : theme.colors.black;
  return opposing;
};

const googleFontUrl = (fontFamily, weights = [300, 400, 700]) => {
  const urlWeights = weights.join(",");
  const fontName = fontFamily
    .split(/, /)[0]
    .trim()
    .replace(/'|"/g, "");
  const urlFont = fontName.split(/ /).join("+");
  const urlBase = `https://fonts.googleapis.com/css?family=${urlFont}:${urlWeights}&display=swap`;
  return urlBase;
};

const formatAsPath = path => {
  return path.join(" → ");
};

const formatCommunities = comms => {
  const commsStr = comms.map(c => `      - ${c}`);
  return "\n" + commsStr.join("\n");
};

const formatBool = val => {
  let fmt = "";
  if (val === true) {
    fmt = "yes";
  } else if (val === false) {
    fmt = "no";
  }
  return fmt;
};

const formatTime = val => {
  const now = dayjs.utc();
  const then = now.subtract(val, "seconds");
  const timestamp = then.toString().replace("GMT", "UTC");
  const relative = now.to(then, true);
  return `${relative} (${timestamp})`;
};

const tableToString = (target, data, config) => {
  try {
    const formatRpkiState = val => {
      const rpkiStateNames = [
        config.web.text.rpki_invalid,
        config.web.text.rpki_valid,
        config.web.text.rpki_unknown,
        config.web.text.rpki_unverified
      ];
      return rpkiStateNames[val];
    };

    const tableFormatMap = {
      age: formatTime,
      active: formatBool,
      as_path: formatAsPath,
      communities: formatCommunities,
      rpki_state: formatRpkiState
    };

    let tableStringParts = [
      `Routes For: ${target}`,
      `Timestamp: ${data.timestamp} UTC`
    ];

    data.output.routes.map(route => {
      config.parsed_data_fields.map(field => {
        const [header, accessor, align] = field;
        if (align !== null) {
          let value = route[accessor];
          const fmtFunc = tableFormatMap[accessor] ?? String;
          value = fmtFunc(value);
          if (accessor === "prefix") {
            tableStringParts.push(`  - ${header}: ${value}`);
          } else {
            tableStringParts.push(`    - ${header}: ${value}`);
          }
        }
      });
    });
    return tableStringParts.join("\n");
  } catch (err) {
    console.error(err);
    return `An error occurred while parsing the output: '${err.message}'`;
  }
};

export { isDark, isLight, opposingColor, googleFontUrl, tableToString };