// @ts-check

"use strict";

const { addError, emphasisOrStrongStyleFor, forEachInlineChild,
  getNextChildToken, getRangeAndFixInfoIfFound } = require("../helpers");

const impl = (params, onError, tagPrefix, asterisk, underline, style) => {
  let lastLineNumber = -1;
  const instances = new Map();
  forEachInlineChild(params, `${tagPrefix}_open`, (token, parent) => {
    const { lineNumber, markup } = token;
    const markupStyle = emphasisOrStrongStyleFor(markup);
    if (style === "consistent") {
      style = markupStyle;
    }
    if (style !== markupStyle) {
      let rangeAndFixInfo = {};
      const contentToken = getNextChildToken(
        parent, token, "text", `${tagPrefix}_close`
      );
      if (contentToken) {
        const { content } = contentToken;
        const actual = `${markup}${content}${markup}`;
        const expectedMarkup =
          (style === "asterisk") ? asterisk : underline;
        const expected = `${expectedMarkup}${content}${expectedMarkup}`;
        if (lastLineNumber !== lineNumber) {
          lastLineNumber = lineNumber;
          instances.clear();
        }
        const instance = (instances.get(expected) || 0) + 1;
        instances.set(expected, instance);
        rangeAndFixInfo = getRangeAndFixInfoIfFound(
          params.lines,
          lineNumber - 1,
          actual,
          expected,
          instance
        );
      }
      addError(
        onError,
        lineNumber,
        `Expected: ${style}; Actual: ${markupStyle}`,
        null,
        rangeAndFixInfo.range,
        rangeAndFixInfo.fixInfo
      );
    }
  });
};

module.exports = [
  {
    "names": [ "MD049", "emphasis-style" ],
    "description": "Emphasis style should be consistent",
    "tags": [ "emphasis" ],
    "function": function MD049(params, onError) {
      const style = String(params.config.style || "consistent");
      return impl(params, onError, "em", "*", "_", style);
    }
  },
  {
    "names": [ "MD050", "strong-style" ],
    "description": "Strong style should be consistent",
    "tags": [ "emphasis" ],
    "function": function MD050(params, onError) {
      const style = String(params.config.style || "consistent");
      return impl(params, onError, "strong", "**", "__", style);
    }
  }
];