import { flattenDeep } from "lodash-es";

let res = [];

/**
 *
 * @param {HTMLDivElement} editor
 */
export function toJSON(editor) {
  // console.log(editor.innerHTML);
  res = [];
  for (const e of [...editor.childNodes]) {
    toSection(e);
  }
  const newRes = [];
  for (let section of res) {
    section = flattenElement(section);

    let newSection = [];
    for (const b of section) {
      const toB = toBlock(b);
      if (toB) newSection.push(toB);
    }
    if (newSection.length === 0) {
      // 空行特殊处理
      newSection = [{ type: "text", value: " ", param: null }];
    }
    newRes.push({ blocks: newSection });
  }
  res = { sections: newRes };
  // console.log(res);
  // console.log(JSON.stringify(res));
  // console.log(JSON.stringify(res, null, 2));
  return JSON.stringify(res, null, 2);
}

/**
 *
 * @param {Node} e
 */
function toSection(e) {
  if (e.nodeType == Node.ELEMENT_NODE && e.nodeName === "DIV") {
    res.push(e.childNodes);
  } else if (e.nodeType == Node.TEXT_NODE) {
    res.push([e]);
  } else {
    console.log("toSection: 非div, 非TEXT", e);
  }
}

/**
 *
 * @param {Node[]} section
 */
function flattenElement(section) {
  section = [...section];
  // console.log(section);
  for (let i = 0; i < section.length; i++) {
    if (section[i].hasChildNodes()) {
      section[i] = [...section[i].childNodes];

      for (let j = 0; j < section[i].length; j++) {
        if (section[i][j].hasChildNodes()) {
          section[i][j] = [...section[i][j].childNodes];
          for (let k = 0; k < section[i][j].length; k++) {
            if (section[i][j][k].hasChildNodes()) {
              section[i][j][k] = [...section[i][j][k].childNodes];
            }
          }
        }
      }
    }
  }
  section = flattenDeep(section);
  return section;
}

/**
 *
 * @param {Node} e
 * @param {String} tag
 */
function checkAncestorElementTag(e, tag) {
  for (let i = 0; i < 3; i++) {
    if (e.parentElement.nodeName === tag) {
      return true;
    } else {
      e = e.parentElement;
    }
  }
  return false;
}

/**
 *
 * @param {Node} e
 */
function toBlock(e) {
  let block = {};
  if (e.nodeType === Node.TEXT_NODE) {
    block.type = "text";
    block.value = e.textContent;
    block.param = {};
    // block.param.italic =
    //   window.getComputedStyle(e.parentElement).fontStyle === "italic";
    // block.param.bold =
    //   window.getComputedStyle(e.parentElement).fontWeight > 400;
    // block.param.underline =
    //   window.getComputedStyle(e.parentElement).textDecorationLine ===
    //   "underline";

    block.param.italic = checkAncestorElementTag(e, "I");
    block.param.bold = checkAncestorElementTag(e, "B");
    block.param.underline = checkAncestorElementTag(e, "U");

    // console.log(block.param);
    const allFalse = Object.values(block.param).every((v) => v === false);
    // console.log(allFalse);
    if (allFalse) {
      block.param = null;
    }
    // } else if (e.nodeType == Node.ELEMENT_NODE && e.nodeName === "SPAN") {
    //   block.type = "text";
    //   block.value = e.textContent;
    //   block.param = {};
  } else if (e.nodeType == Node.ELEMENT_NODE && e.nodeName === "U") {
    block.type = "text";
    block.value = e.textContent;
    block.param = { underline: true };
  } else if (e.nodeType == Node.ELEMENT_NODE && e.nodeName === "B") {
    block.type = "text";
    block.value = e.textContent;
    block.param = { bold: true };
  } else if (e.nodeType == Node.ELEMENT_NODE && e.nodeName === "I") {
    block.type = "text";
    block.value = e.textContent;
    block.param = { italic: true };
  } else if (e.nodeType == Node.ELEMENT_NODE && e.nodeName === "IMG") {
    block.type = "image";
    block.value = e.src;
    block.param = { width: e.width, height: e.height };
  } else if (e.nodeType == Node.ELEMENT_NODE && e.nodeName === "BR") {
    block.type = "text";
    block.value = "";
    block.param = null;
  } else {
    console.log("toBlock: 非法", e);
  }

  if (block.type === "text" && block.value === "") {
    block = null; // 返回null的block，从json中剔除
  }
  return block;
}