"use strict";

var runtimeHtmlHelpers = require("marko/runtime/html/helpers");
var escapeXml = runtimeHtmlHelpers.x;
var escapeXmlAttr = runtimeHtmlHelpers.xa;
var escapeScript = runtimeHtmlHelpers.xs;
var escapeStyle = runtimeHtmlHelpers.xc;

var openTagOnly = {};

[
  "base",
  "br",
  "col",
  "hr",
  "embed",
  "img",
  "input",
  "keygen",
  "link",
  "meta",
  "param",
  "source",
  "track",
  "wbr"
].forEach(function(tagName) {
  openTagOnly[tagName] = true;
});

function getNodeValue(node) {
  return node.___nodeValue || node.nodeValue;
}

function getFirstChild(node) {
  return node.___firstChild || node.firstChild;
}

function getNextSibling(node) {
  return node.___nextSibling || node.nextSibling;
}

function vdomToHTML(node, options) {
  // NOTE: We don't use XMLSerializer because we need to sort the attributes to correctly compare output HTML strings
  // BAD: return (new XMLSerializer()).serializeToString(node);
  var html = "";
  function serializeHelper(node) {
    var nodeType = node.nodeType || node.___nodeType;

    if (nodeType === 1) {
      serializeElHelper(node);
    } else if (nodeType === 3) {
      serializeTextHelper(node);
    } else if (nodeType === 8) {
      serializeCommentHelper(node);
    } else {
      html += `INVALID NODE TYPE ${nodeType}\n`;
    }
  }

  function serializeElHelper(el) {
    var tagName = el.nodeName;

    html += "<" + tagName;

    var attributes = el.attributes;
    var attributesArray = [];
    var attrName;

    if (typeof attributes.length === "number") {
      for (var i = 0; i < attributes.length; i++) {
        var attr = attributes[i];
        attrName = attr.name;

        if (attrName === "data-marko-const") {
          continue;
        }
        attributesArray.push(
          " " + attrName + '="' + escapeXmlAttr(attr.value) + '"'
        );
      }
    } else {
      for (attrName in attributes) {
        if (attrName === "data-marko-const") {
          continue;
        }

        var attrValue = attributes[attrName];
        if (typeof attrValue !== "string") {
          if (attrValue === true) {
            attrValue = "";
          } else if (!attrValue) {
            continue;
          }
        }

        if (attrName === "xlink:href") {
          attrName = "http://www.w3.org/1999/xlink:href";
        }
        attributesArray.push(
          " " + attrName + '="' + escapeXmlAttr(attrValue) + '"'
        );
      }
    }

    attributesArray.sort();

    html += attributesArray.join("");

    html += ">";

    var hasEndTag = true;
    if (tagName.toUpperCase() === "TEXTAREA") {
      html += el.value;
    } else {
      var curChild = getFirstChild(el);
      if (curChild) {
        while (curChild) {
          let nodeType = curChild.nodeType || curChild.___nodeType;
          if (nodeType === 3) {
            let tag = tagName.toUpperCase();
            let escapeText =
              tag === "SCRIPT"
                ? escapeScript
                : tag === "STYLE"
                ? escapeStyle
                : escapeXml;
            serializeTextHelper(curChild, escapeText);
          } else {
            serializeHelper(curChild);
          }

          curChild = getNextSibling(curChild);
        }
      } else if (openTagOnly[tagName.toLowerCase()]) {
        hasEndTag = false;
      }
    }

    if (hasEndTag) {
      html += "</" + tagName + ">";
    }
  }

  function serializeTextHelper(node, escape) {
    escape = escape || escapeXml;
    html += escape(getNodeValue(node));
  }

  function serializeCommentHelper(node) {
    html += "<!--" + getNodeValue(node) + "-->";
  }

  let nodeType = node.nodeType || node.___nodeType;

  if (
    nodeType === 11 /* DocumentFragment */ ||
    (options && options.childrenOnly)
  ) {
    var curChild = getFirstChild(node);
    while (curChild) {
      serializeHelper(curChild);
      curChild = getNextSibling(curChild);
    }
  } else {
    serializeHelper(node);
  }

  return html;
}

module.exports = vdomToHTML;
