/////////////////////////////////////////////////////////////
//
// pgAdmin 4 - PostgreSQL Tools
//
// Copyright (C) 2013 - 2021, The pgAdmin Development Team
// This software is released under the PostgreSQL Licence
//
//////////////////////////////////////////////////////////////

import * as BrowserFS from 'browserfs'
import url_for from 'sources/url_for';
import pgAdmin from 'sources/pgadmin';
import _ from 'underscore';
import { FileType } from 'react-aspen'
import { findInTree } from './tree';

import { dirname, unix } from 'path-fx';

export class ManageTreeNodes {
  constructor(fs) {
    this.tree = {}
	this.tempTree = new TreeNode(undefined, {});
  }

  public init = (_root: string) => new Promise((res, rej) => {
    let node = {parent: null, children: [], data: null};
    this.tree = {};
    this.tree[_root] = {name: 'root', type: FileType.Directory, metadata: node};
    res();
  })

  public updateNode = (_path, _data)  => new Promise((res, rej) => {
    if (_path in this.tree) {
      const item = this.tree[_path];
      item.name = _data.label;
      item.metadata.data = _data;
    }
    res(true);
  })

  public removeNode = async (_path, _removeOnlyChild)  => {
    const item = this.findNode(_path);

    if (item && item.parentNode) {
      item.children = [];
      item.parentNode.children.splice(item.parentNode.children.indexOf(item), 1);
    }
    return true;
  };

  findNode(path) {
    if (path === null || path === undefined || path.length === 0 || path == '/browser') {
      return this.tempTree;
    }
    return findInTree(this.tempTree, path);
  }

  public addNode = (_parent: string, _path: string, _data: []) => new Promise((res, rej) => {
    _data.type = _data.inode ? FileType.Directory : FileType.File;
    _data._label = _data.label;
    _data.label = _.escape(_data.label);

    _data.is_collection = isCollectionNode(_data._type);
    let nodeData = {parent: _parent, children: [], data: _data};

    let tmpParentNode = this.findNode(_parent);
    let treeNode = new TreeNode(_data.id, _data, {}, tmpParentNode, nodeData, _data.type);

    if (tmpParentNode !== null && tmpParentNode !== undefined) tmpParentNode.children.push(treeNode);

    res(treeNode);
  })

  public readNode = (_path: string) => new Promise<string[]>((res, rej) => {
    let temp_tree_path = _path,
      node = this.findNode(_path),
      base_url = pgAdmin.Browser.URL;

    if (node && node.children.length > 0) {
      if (!node.type === FileType.File) {
        rej("It's a leaf node")
      }
      else {
        if (node.children.length != 0) res(node.children)
      }
    }

    var self = this;

    async function loadData() {
      let url = '';
      if (_path == '/browser') {
        url = url_for('browser.nodes');
      } else {
        let _parent_url = self.generate_url(_path);
        if (node.metadata.data._pid == null ) {
          url = node.metadata.data._type + '/children/' + node.metadata.data._id;
        }
        else {
          if (node.metadata.data._type.includes("coll-")) {
            let _type = node.metadata.data._type.replace("coll-", "")
            url = _type + '/nodes/' + _parent_url;
          }
          else {
            url = node.metadata.data._type + '/children/' + _parent_url + '/' + node.metadata.data._id;
          }
        }

        url = base_url + url;

        temp_tree_path = node.path;

        if (node.metadata.data._type == 'server' && !node.metadata.data.connected) {
          url = null;
        }
      }

      async function jsonData(url) {
        let res = await fetch(url, {
          headers: {
            'X-Requested-With': 'XMLHttpRequest',
            'X-pgA-CSRFToken': pgAdmin.csrf_token
          },
        });

        if (res.status == 200) {
          try {
            let json = await res.json();
            return json.data;
          } catch (e) {
            console.warn(e);
          }
        }
        throw new Error("Node Load Error...");
        return [];
      }

      let treeData = null;
      if (url) treeData = await jsonData(url);

      const Path = BrowserFS.BFSRequire('path')
      const fill = async (tree) => {
        for (let idx in tree) {
          const _node = tree[idx]
          const _pathl = Path.join(_path, _node.id)
          await self.addNode(temp_tree_path, _pathl, _node);
        }
      }

      let d = await fill(treeData);
      if (node.children.length > 0) res(node.children);
      else res(null);

    }
    loadData();
  })

  public generate_url = (path: string) => {
    let _path = path;
    let _parent_path = [];
    let _partitions = [];
    while(_path != '/') {
      let node = this.findNode(_path);
      let _parent = unix.dirname(_path);
      if(node.parentNode && node.parentNode.path == _parent) {
        if (node.parentNode.metadata.data !== null && !node.parentNode.metadata.data._type.includes('coll-'))
          if(node.parentNode.metadata.data._type.includes('partition')) {
            _partitions.push(node.parentNode.metadata.data._id);
          } else {
            _parent_path.push(node.parentNode.metadata.data._id);
          }
     }
     _path = _parent;
    }
    // Replace the table with the last partition as in reality partition node is not child of the table
    if(_partitions.length > 0) _parent_path[0]  = _partitions[_partitions.length-1];

    let _rev_arr = _parent_path.reverse();
    return _rev_arr.join("/");
  }
}



export class TreeNode {
  constructor(id, data, domNode, parent, metadata, type) {
    this.id = id;
    this.data = data;
    this.setParent(parent);
    this.children = [];
    this.domNode = domNode;
    this.metadata = metadata;
    this.name = metadata ? metadata.data.label : "";
    this.type = type ? type : undefined;
  }

  hasParent() {
    return this.parentNode !== null && this.parentNode !== undefined;
  }

  parent() {
    return this.parentNode;
  }

  setParent(parent) {
    this.parentNode = parent;
    this.path = this.id;
    if (this.id)
      if (parent !== null && parent !== undefined && parent.path !== undefined) {
        this.path = parent.path + '/' + this.id;
      } else {
        this.path =  '/browser/' + this.id;
      }
  }

  getData() {
    if (this.data === undefined) {
      return undefined;
    } else if (this.data === null) {
      return null;
    }
    return Object.assign({}, this.data);
  }

  getHtmlIdentifier() {
    return this.domNode;
  }

  /*
   * Find the ancestor with matches this condition
   */
  ancestorNode(condition) {
    let node = this;

    while (node.hasParent()) {
      node = node.parent();
      if (condition(node)) {
        return node;
      }
    }

    return null;
  }

  /**
   * Given a condition returns true if the current node
   * or any of the parent nodes condition result is true
   */
  anyFamilyMember(condition) {
    if(condition(this)) {
      return true;
    }

    return this.ancestorNode(condition) !== null;
  }
  anyParent(condition) {
    return this.ancestorNode(condition) !== null;
  }

  reload(tree) {
    return new Promise((resolve)=>{
      this.unload(tree)
        .then(()=>{
          tree.setInode(this.domNode);
          tree.deselect(this.domNode);
          setTimeout(() => {
            tree.selectNode(this.domNode);
          }, 0);
          resolve();
        });
    });
  }

  unload(tree) {
    return new Promise((resolve, reject)=>{
      this.children = [];
      tree.unload(this.domNode)
        .then(
          ()=>{
            resolve(true);
          },
          ()=>{
            reject();
          });
    });
  }


  open(tree, suppressNoDom) {
    return new Promise((resolve, reject)=>{
      if(suppressNoDom && (this.domNode == null || typeof(this.domNode) === 'undefined')) {
        resolve(true);
      } else if(tree.isOpen(this.domNode)) {
        resolve(true);
      } else {
        tree.open(this.domNode).then(val => resolve(true), err => reject(true));
      }
    });
  }

}

export function isCollectionNode(node) {
    if (pgAdmin.Browser.Nodes && node in pgAdmin.Browser.Nodes) {
      if (pgAdmin.Browser.Nodes[node].is_collection !== undefined) return pgAdmin.Browser.Nodes[node].is_collection;
      else return false;
    }
    return false;
}