/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 * @flow
 * @emails oncall+draft_js
 */
'use strict';

import type { BlockMap } from "./BlockMap";
import type { BlockNodeRawConfig } from "./BlockNode";
import type { BlockNodeRecord } from "./BlockNodeRecord";
import type { ContentStateRawType } from "./ContentStateRawType";
import type DraftEntityInstance from "./DraftEntityInstance";
import type { DraftEntityMutability } from "./DraftEntityMutability";
import type { DraftEntityType } from "./DraftEntityType";
import type { Map } from "immutable";

const BlockMapBuilder = require("./BlockMapBuilder");

const CharacterMetadata = require("./CharacterMetadata");

const ContentBlock = require("./ContentBlock");

const ContentBlockNode = require("./ContentBlockNode");

const DraftEntity = require("./DraftEntity");

const SelectionState = require("./SelectionState");

const generateRandomKey = require("./generateRandomKey");

const getOwnObjectValues = require("./getOwnObjectValues");

const gkx = require("./gkx");

const Immutable = require("immutable");

const sanitizeDraftText = require("./sanitizeDraftText");

const {
  List,
  Record,
  Repeat,
  Map: ImmutableMap,
  OrderedMap
} = Immutable;
type ContentStateRecordType = {
  entityMap: ?any,
  blockMap: ?BlockMap,
  selectionBefore: ?SelectionState,
  selectionAfter: ?SelectionState,
  ...
};
const defaultRecord: ContentStateRecordType = {
  entityMap: null,
  blockMap: null,
  selectionBefore: null,
  selectionAfter: null
};
const ContentStateRecord = (Record(defaultRecord): any);
/* $FlowFixMe[signature-verification-failure] Supressing a `signature-
 * verification-failure` error here. TODO: T65949050 Clean up the branch for
 * this GK */

const ContentBlockNodeRecord = gkx('draft_tree_data_support') ? ContentBlockNode : ContentBlock;

class ContentState extends ContentStateRecord {
  getEntityMap(): any {
    // TODO: update this when we fully remove DraftEntity
    return DraftEntity;
  }

  getBlockMap(): BlockMap {
    return this.get('blockMap');
  }

  getSelectionBefore(): SelectionState {
    return this.get('selectionBefore');
  }

  getSelectionAfter(): SelectionState {
    return this.get('selectionAfter');
  }

  getBlockForKey(key: string): BlockNodeRecord {
    const block: BlockNodeRecord = this.getBlockMap().get(key);
    return block;
  }

  getKeyBefore(key: string): ?string {
    return this.getBlockMap().reverse().keySeq().skipUntil(v => v === key).skip(1).first();
  }

  getKeyAfter(key: string): ?string {
    return this.getBlockMap().keySeq().skipUntil(v => v === key).skip(1).first();
  }

  getBlockAfter(key: string): ?BlockNodeRecord {
    return this.getBlockMap().skipUntil((_, k) => k === key).skip(1).first();
  }

  getBlockBefore(key: string): ?BlockNodeRecord {
    return this.getBlockMap().reverse().skipUntil((_, k) => k === key).skip(1).first();
  }

  getBlocksAsArray(): Array<BlockNodeRecord> {
    return this.getBlockMap().toArray();
  }

  getFirstBlock(): BlockNodeRecord {
    return this.getBlockMap().first();
  }

  getLastBlock(): BlockNodeRecord {
    return this.getBlockMap().last();
  }

  getPlainText(delimiter?: string): string {
    return this.getBlockMap().map(block => {
      return block ? block.getText() : '';
    }).join(delimiter || '\n');
  }

  getLastCreatedEntityKey(): string {
    // TODO: update this when we fully remove DraftEntity
    return DraftEntity.__getLastCreatedEntityKey();
  }

  hasText(): boolean {
    const blockMap = this.getBlockMap();
    return blockMap.size > 1 || // make sure that there are no zero width space chars
    escape(blockMap.first().getText()).replace(/%u200B/g, '').length > 0;
  }

  createEntity(type: DraftEntityType, mutability: DraftEntityMutability, data?: Object): ContentState {
    // TODO: update this when we fully remove DraftEntity
    DraftEntity.__create(type, mutability, data);

    return this;
  }

  mergeEntityData(key: string, toMerge: {
    [key: string]: any,
    ...
  }): ContentState {
    // TODO: update this when we fully remove DraftEntity
    DraftEntity.__mergeData(key, toMerge);

    return this;
  }

  replaceEntityData(key: string, newData: {
    [key: string]: any,
    ...
  }): ContentState {
    // TODO: update this when we fully remove DraftEntity
    DraftEntity.__replaceData(key, newData);

    return this;
  }

  addEntity(instance: DraftEntityInstance): ContentState {
    // TODO: update this when we fully remove DraftEntity
    DraftEntity.__add(instance);

    return this;
  }

  getEntity(key: string): DraftEntityInstance {
    // TODO: update this when we fully remove DraftEntity
    return DraftEntity.__get(key);
  }

  getAllEntities(): Map<string, DraftEntityInstance> {
    return DraftEntity.__getAll();
  }

  loadWithEntities(entities: Map<string, DraftEntityInstance>): void {
    return DraftEntity.__loadWithEntities(entities);
  }

  static createFromBlockArray( // TODO: update flow type when we completely deprecate the old entity API
  blocks: Array<BlockNodeRecord> | {
    contentBlocks: Array<BlockNodeRecord>,
    ...
  }, entityMap: ?any): ContentState {
    // TODO: remove this when we completely deprecate the old entity API
    const theBlocks = Array.isArray(blocks) ? blocks : blocks.contentBlocks;
    const blockMap = BlockMapBuilder.createFromArray(theBlocks);
    const selectionState = blockMap.isEmpty() ? new SelectionState() : SelectionState.createEmpty(blockMap.first().getKey());
    return new ContentState({
      blockMap,
      entityMap: entityMap || DraftEntity,
      selectionBefore: selectionState,
      selectionAfter: selectionState
    });
  }

  static createFromText(text: string, delimiter: string | RegExp = /\r\n?|\n/g): ContentState {
    const strings = text.split(delimiter);
    const blocks = strings.map(block => {
      block = sanitizeDraftText(block);
      return new ContentBlockNodeRecord({
        key: generateRandomKey(),
        text: block,
        type: 'unstyled',
        characterList: List(Repeat(CharacterMetadata.EMPTY, block.length))
      });
    });
    return ContentState.createFromBlockArray(blocks);
  }

  static fromJS(state: ContentStateRawType): ContentState {
    return new ContentState({ ...state,
      blockMap: OrderedMap(state.blockMap).map(ContentState.createContentBlockFromJS),
      selectionBefore: new SelectionState(state.selectionBefore),
      selectionAfter: new SelectionState(state.selectionAfter)
    });
  }

  static createContentBlockFromJS(block: BlockNodeRawConfig): ContentBlockNodeRecord {
    const characterList = block.characterList;
    return new ContentBlockNodeRecord({ ...block,
      data: ImmutableMap(block.data),
      characterList: characterList != null ? List((Array.isArray(characterList) ? characterList : getOwnObjectValues(characterList)).map(c => CharacterMetadata.fromJS(c))) : undefined
    });
  }

}

module.exports = ContentState;