"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.toTree = toTree;
var _getActiveFormats = require("./get-active-formats");
var _getFormatType = require("./get-format-type");
var _specialCharacters = require("./special-characters");
/**
 * Internal dependencies
 */

function restoreOnAttributes(attributes, isEditableTree) {
  if (isEditableTree) {
    return attributes;
  }
  const newAttributes = {};
  for (const key in attributes) {
    let newKey = key;
    if (key.startsWith('data-disable-rich-text-')) {
      newKey = key.slice('data-disable-rich-text-'.length);
    }
    newAttributes[newKey] = attributes[key];
  }
  return newAttributes;
}

/**
 * Converts a format object to information that can be used to create an element
 * from (type, attributes and object).
 *
 * @param {Object}  $1                        Named parameters.
 * @param {string}  $1.type                   The format type.
 * @param {string}  $1.tagName                The tag name.
 * @param {Object}  $1.attributes             The format attributes.
 * @param {Object}  $1.unregisteredAttributes The unregistered format
 *                                            attributes.
 * @param {boolean} $1.object                 Whether or not it is an object
 *                                            format.
 * @param {boolean} $1.boundaryClass          Whether or not to apply a boundary
 *                                            class.
 * @param {boolean} $1.isEditableTree
 *
 * @return {Object} Information to be used for element creation.
 */
function fromFormat({
  type,
  tagName,
  attributes,
  unregisteredAttributes,
  object,
  boundaryClass,
  isEditableTree
}) {
  const formatType = (0, _getFormatType.getFormatType)(type);
  let elementAttributes = {};
  if (boundaryClass && isEditableTree) {
    elementAttributes['data-rich-text-format-boundary'] = 'true';
  }
  if (!formatType) {
    if (attributes) {
      elementAttributes = {
        ...attributes,
        ...elementAttributes
      };
    }
    return {
      type,
      attributes: restoreOnAttributes(elementAttributes, isEditableTree),
      object
    };
  }
  elementAttributes = {
    ...unregisteredAttributes,
    ...elementAttributes
  };
  for (const name in attributes) {
    const key = formatType.attributes ? formatType.attributes[name] : false;
    if (key) {
      elementAttributes[key] = attributes[name];
    } else {
      elementAttributes[name] = attributes[name];
    }
  }
  if (formatType.className) {
    if (elementAttributes.class) {
      elementAttributes.class = `${formatType.className} ${elementAttributes.class}`;
    } else {
      elementAttributes.class = formatType.className;
    }
  }

  // When a format is declared as non editable, make it non editable in the
  // editor.
  if (isEditableTree && formatType.contentEditable === false) {
    elementAttributes.contenteditable = 'false';
  }
  return {
    type: tagName || formatType.tagName,
    object: formatType.object,
    attributes: restoreOnAttributes(elementAttributes, isEditableTree)
  };
}

/**
 * Checks if both arrays of formats up until a certain index are equal.
 *
 * @param {Array}  a     Array of formats to compare.
 * @param {Array}  b     Array of formats to compare.
 * @param {number} index Index to check until.
 */
function isEqualUntil(a, b, index) {
  do {
    if (a[index] !== b[index]) {
      return false;
    }
  } while (index--);
  return true;
}
function toTree({
  value,
  preserveWhiteSpace,
  createEmpty,
  append,
  getLastChild,
  getParent,
  isText,
  getText,
  remove,
  appendText,
  onStartIndex,
  onEndIndex,
  isEditableTree,
  placeholder
}) {
  const {
    formats,
    replacements,
    text,
    start,
    end
  } = value;
  const formatsLength = formats.length + 1;
  const tree = createEmpty();
  const activeFormats = (0, _getActiveFormats.getActiveFormats)(value);
  const deepestActiveFormat = activeFormats[activeFormats.length - 1];
  let lastCharacterFormats;
  let lastCharacter;
  append(tree, '');
  for (let i = 0; i < formatsLength; i++) {
    const character = text.charAt(i);
    const shouldInsertPadding = isEditableTree && (
    // Pad the line if the line is empty.
    !lastCharacter ||
    // Pad the line if the previous character is a line break, otherwise
    // the line break won't be visible.
    lastCharacter === '\n');
    const characterFormats = formats[i];
    let pointer = getLastChild(tree);
    if (characterFormats) {
      characterFormats.forEach((format, formatIndex) => {
        if (pointer && lastCharacterFormats &&
        // Reuse the last element if all formats remain the same.
        isEqualUntil(characterFormats, lastCharacterFormats, formatIndex)) {
          pointer = getLastChild(pointer);
          return;
        }
        const {
          type,
          tagName,
          attributes,
          unregisteredAttributes
        } = format;
        const boundaryClass = isEditableTree && format === deepestActiveFormat;
        const parent = getParent(pointer);
        const newNode = append(parent, fromFormat({
          type,
          tagName,
          attributes,
          unregisteredAttributes,
          boundaryClass,
          isEditableTree
        }));
        if (isText(pointer) && getText(pointer).length === 0) {
          remove(pointer);
        }
        pointer = append(newNode, '');
      });
    }

    // If there is selection at 0, handle it before characters are inserted.
    if (i === 0) {
      if (onStartIndex && start === 0) {
        onStartIndex(tree, pointer);
      }
      if (onEndIndex && end === 0) {
        onEndIndex(tree, pointer);
      }
    }
    if (character === _specialCharacters.OBJECT_REPLACEMENT_CHARACTER) {
      const replacement = replacements[i];
      if (!replacement) {
        continue;
      }
      const {
        type,
        attributes,
        innerHTML
      } = replacement;
      const formatType = (0, _getFormatType.getFormatType)(type);
      if (!isEditableTree && type === 'script') {
        pointer = append(getParent(pointer), fromFormat({
          type: 'script',
          isEditableTree
        }));
        append(pointer, {
          html: decodeURIComponent(attributes['data-rich-text-script'])
        });
      } else if (formatType?.contentEditable === false) {
        // For non editable formats, render the stored inner HTML.
        pointer = append(getParent(pointer), fromFormat({
          ...replacement,
          isEditableTree,
          boundaryClass: start === i && end === i + 1
        }));
        if (innerHTML) {
          append(pointer, {
            html: innerHTML
          });
        }
      } else {
        pointer = append(getParent(pointer), fromFormat({
          ...replacement,
          object: true,
          isEditableTree
        }));
      }
      // Ensure pointer is text node.
      pointer = append(getParent(pointer), '');
    } else if (!preserveWhiteSpace && character === '\n') {
      pointer = append(getParent(pointer), {
        type: 'br',
        attributes: isEditableTree ? {
          'data-rich-text-line-break': 'true'
        } : undefined,
        object: true
      });
      // Ensure pointer is text node.
      pointer = append(getParent(pointer), '');
    } else if (!isText(pointer)) {
      pointer = append(getParent(pointer), character);
    } else {
      appendText(pointer, character);
    }
    if (onStartIndex && start === i + 1) {
      onStartIndex(tree, pointer);
    }
    if (onEndIndex && end === i + 1) {
      onEndIndex(tree, pointer);
    }
    if (shouldInsertPadding && i === text.length) {
      append(getParent(pointer), _specialCharacters.ZWNBSP);
      if (placeholder && text.length === 0) {
        append(getParent(pointer), {
          type: 'span',
          attributes: {
            'data-rich-text-placeholder': placeholder,
            // Necessary to prevent the placeholder from catching
            // selection and being editable.
            style: 'pointer-events:none;user-select:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;'
          }
        });
      }
    }
    lastCharacterFormats = characterFormats;
    lastCharacter = character;
  }
  return tree;
}
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