"use strict";

const _ = require("lodash");
const chalk = require("chalk");
const path = require("path");
const stringWidth = require("string-width");
const symbols = require("log-symbols");
const table = require("table");
const utils = require("postcss-reporter/lib/util");

const MARGIN_WIDTHS = 9;

const levelColors = {
  info: "blue",
  warning: "yellow",
  error: "red"
};

function deprecationsFormatter(results) {
  const allDeprecationWarnings = _.flatMap(results, "deprecations");
  const uniqueDeprecationWarnings = _.uniqBy(allDeprecationWarnings, "text");

  if (!uniqueDeprecationWarnings || !uniqueDeprecationWarnings.length) {
    return "";
  }

  return uniqueDeprecationWarnings.reduce((output, warning) => {
    output += chalk.yellow("Deprecation Warning: ");
    output += warning.text;
    if (warning.reference) {
      output += chalk.dim(" See: ");
      output += chalk.dim.underline(warning.reference);
    }
    return output + "\n";
  }, "\n");
}

function invalidOptionsFormatter(results) {
  const allInvalidOptionWarnings = _.flatMap(results, r =>
    r.invalidOptionWarnings.map(w => w.text)
  );
  const uniqueInvalidOptionWarnings = _.uniq(allInvalidOptionWarnings);

  return uniqueInvalidOptionWarnings.reduce((output, warning) => {
    output += chalk.red("Invalid Option: ");
    output += warning;
    return output + "\n";
  }, "\n");
}

function logFrom(fromValue) {
  if (fromValue.charAt(0) === "<") return fromValue;
  return path
    .relative(process.cwd(), fromValue)
    .split(path.sep)
    .join("/");
}

function getMessageWidth(columnWidths) {
  if (!process.stdout.isTTY) {
    return columnWidths[3];
  }

  const availableWidth =
    process.stdout.columns < 80 ? 80 : process.stdout.columns;
  const fullWidth = _.sum(_.values(columnWidths));

  // If there is no reason to wrap the text, we won't align the last column to the right
  if (availableWidth > fullWidth + MARGIN_WIDTHS) {
    return columnWidths[3];
  }

  return availableWidth - (fullWidth - columnWidths[3] + MARGIN_WIDTHS);
}

function formatter(messages, source) {
  if (!messages.length) return "";

  const orderedMessages = _.sortBy(
    messages,
    m => (m.line ? 2 : 1), // positionless first
    m => m.line,
    m => m.column
  );

  // Create a list of column widths, needed to calculate
  // the size of the message column and if needed wrap it.
  const columnWidths = { 0: 1, 1: 1, 2: 1, 3: 1, 4: 1 };

  const calculateWidths = function(columns) {
    _.forOwn(columns, (value, key) => {
      const normalisedValue = value ? value.toString() : value;
      columnWidths[key] = Math.max(
        columnWidths[key],
        stringWidth(normalisedValue)
      );
    });

    return columns;
  };

  let output = "\n";

  if (source) {
    output += chalk.underline(logFrom(source)) + "\n";
  }

  const cleanedMessages = orderedMessages.map(message => {
    const location = utils.getLocation(message);
    const severity = message.severity;
    const row = [
      location.line || "",
      location.column || "",
      symbols[severity]
        ? chalk[levelColors[severity]](symbols[severity])
        : severity,
      message.text
        // Remove all control characters (newline, tab and etc)
        .replace(/[\x01-\x1A]+/g, " ") // eslint-disable-line
        .replace(/\.$/, "")
        .replace(
          new RegExp(_.escapeRegExp("(" + message.rule + ")") + "$"),
          ""
        ),
      chalk.dim(message.rule || "")
    ];

    calculateWidths(row);

    return row;
  });

  output += table
    .table(cleanedMessages, {
      border: table.getBorderCharacters("void"),
      columns: {
        0: { alignment: "right", width: columnWidths[0], paddingRight: 0 },
        1: { alignment: "left", width: columnWidths[1] },
        2: { alignment: "center", width: columnWidths[2] },
        3: {
          alignment: "left",
          width: getMessageWidth(columnWidths),
          wrapWord: true
        },
        4: { alignment: "left", width: columnWidths[4], paddingRight: 0 }
      },
      drawHorizontalLine: () => false
    })
    .split("\n")
    .map(el =>
      el.replace(/(\d+)\s+(\d+)/, (m, p1, p2) => chalk.dim(p1 + ":" + p2))
    )
    .join("\n");

  return output;
}

module.exports = function(results) {
  let output = invalidOptionsFormatter(results);
  output += deprecationsFormatter(results);

  output = results.reduce((output, result) => {
    // Treat parseErrors as warnings
    if (result.parseErrors) {
      result.parseErrors.forEach(error =>
        result.warnings.push({
          line: error.line,
          column: error.column,
          rule: error.stylelintType,
          severity: "error",
          text: `${error.text} (${error.stylelintType})`
        })
      );
    }
    output += formatter(result.warnings, result.source);
    return output;
  }, output);

  // Ensure consistent padding
  output = output.trim();

  if (output !== "") {
    output = "\n" + output + "\n\n";
  }

  return output;
};