/**
 * EGroupware eTemplate2 - JS content array manager
 *
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @package etemplate
 * @subpackage api
 * @link http://www.egroupware.org
 * @author Andreas Stöckel
 *

/*egw:uses
	et2_core_common;
	egw_inheritance;
	et2_core_phpExpressionCompiler;
*/

import {et2_widget} from "./et2_core_widget";

/**
 * Manage access to various template customisation arrays passed to etemplate->exec().
 *
 * This manages access to content, modifications and readonlys arrays
 */
export class et2_arrayMgr
{
	splitIds: boolean = true;
	public data: object;
	// Holds information about the current perspective
	public perspectiveData: { owner: et2_widget; row: number; key: string } = {
		"owner": null,
		"key": null,
		"row": null
	};
	protected static compiledExpressions: object = {};
	private readonly _parentMgr: et2_arrayMgr;
	protected readOnly: boolean = false;

	/**
	 * Constructor
	 *
	 * @memberOf et2_arrayMgr
	 * @param _data
	 * @param _parentMgr
	 */
	constructor(_data: object = {}, _parentMgr?: et2_arrayMgr) {
		if (typeof _parentMgr == "undefined") {
			_parentMgr = null;
		}

		// Copy the parent manager which is needed to access relative data when
		// being in a relative perspective of the manager
		this._parentMgr = _parentMgr;

		// Hold a reference to the data
		if (typeof _data == "undefined" || !_data) {
			egw.debug("log", "No data passed to content array manager.  Probably a mismatch between template namespaces and data.");
			_data = {};
		}

		// Expand sub-arrays that have been shmushed together, so further perspectives work
		// Shmushed keys look like: ${row}[info_cat]
		// Expanded: ${row}: Object{info_cat: ..value}
		if (this.splitIds) {
			// For each index, we need a key: {..} sub array
			for (let key in _data) {
				// Split up indexes
				const indexes = key.replace(/[/g, "[").split('[');

				// Put data in the proper place
				if (indexes.length > 1) {
					const value = _data[key];
					let target = _data;
					for (let i = 0; i < indexes.length; i++) {
						indexes[i] = indexes[i].replace(/&#x5D;/g, '').replace(']', '');
						if (typeof target[indexes[i]] == "undefined" || target[indexes[i]] === null) {
							target[indexes[i]] = i == indexes.length - 1 ? value : {};
						}
						target = target[indexes[i]];
					}
					delete _data[key];
				}
			}
		}

		this.data = _data;
	}

	/**
	 * Returns the root content array manager object
	 */
	getRoot(): et2_arrayMgr {
		if (this._parentMgr != null) {
			return this._parentMgr.getRoot();
		}

		return this;
	}

	getParentMgr(): et2_arrayMgr {
		return this._parentMgr;
	}

	getPerspectiveData(): { owner: et2_widget; row: number; key: string } {
		return this.perspectiveData;
	}

	setPerspectiveData(new_perspective: { owner: et2_widget; row: number; key: string }) {
		this.perspectiveData = new_perspective;
	}

	setRow(new_row: number) {
		this.perspectiveData.row = new_row;
	}

	/**
	 * Explodes compound keys (eg IDs) into a list of namespaces
	 * This uses no internal values, just expands
	 *
	 * eg:
	 * a[b][c] => [a,b,c]
	 * col_filter[tr_tracker] => [col_filter, tr_tracker]
	 *
	 * @param {string} _key
	 *
	 * @return {string[]}
	 */
	explodeKey(_key: string): string[] {
		// Parse the given key by removing the "]"-chars and splitting at "["
		let indexes = [_key];

		if (typeof _key === "string") {
			_key = _key.replace(/&#x5B;/g, "[").replace(/&#x5D;/g, "]");
			indexes = _key.split('[');
		}
		if (indexes.length > 1) {
			indexes = [indexes.shift(), indexes.join('[')];
			indexes[1] = indexes[1].substring(0, indexes[1].length - 1);
			const children = indexes[1].split('][');
			if (children.length) {
				indexes = jQuery.merge([indexes[0]], children);
			}
		}
		return indexes;
	}

	/**
	 * Returns the path to this content array manager perspective as an array
	 * containing the key values
	 *
	 * @param _path is used internally, do not supply it manually.
	 */
	getPath(_path?: string[]): string[] {
		if (typeof _path == "undefined") {
			_path = [];
		}

		if (this.perspectiveData.key != null) {
			// prepend components of this.perspectiveData.key to path, can be more then one eg. "nm[rows]"
			_path = this.perspectiveData.key.replace(/]/g, '').split('[').concat(_path);
		}

		if (this._parentMgr != null) {
			_path = this._parentMgr.getPath(_path);
		}

		return _path;
	}

	/**
	 * Get array entry is the equivalent to the boetemplate get_array function.
	 * It returns a reference to the (sub) array with the given key. This also works
	 * for keys using the ETemplate referencing scheme like a[b][c]
	 *
	 * @param _key is the string index, may contain sub-indices like a[b]
	 * @param _referenceInto if true none-existing sub-arrays/-indices get created
	 *    to be returned as reference, else false is returned. Defaults to false
	 * @param _skipEmpty returns null if _key is not present in this content array.
	 *    Defaults to false.
	 */
	getEntry(_key: string, _referenceInto?: boolean, _skipEmpty?: boolean): string | object {
		if (typeof _referenceInto == "undefined") {
			_referenceInto = false;
		}

		if (typeof _skipEmpty == "undefined") {
			_skipEmpty = false;
		}

		// Parse the given key by removing the "]"-chars and splitting at "["
		const indexes = this.explodeKey(_key);

		let entry = this.data;
		for (let i = 0; i < indexes.length; i++) {
			// Abort if the current entry is not an object (associative array) and
			// we should descend further into it.
			const isObject = typeof entry === 'object';
			if (!isObject && !_referenceInto || entry == null || jQuery.isEmptyObject(entry)) {
				return null;
			}

			// Check whether the entry actually exists
			const idx = indexes[i];
			if (_skipEmpty && (!isObject || typeof entry[idx] == "undefined")) {
				return null;
			}

			entry = entry[idx];
		}

		return entry;
	}

	/**
	 * Equivalent to the boetemplate::expand_name function.
	 *
	 * Expands variables inside the given identifier to their values inside the
	 * content array.
	 *
	 * @param {string} _ident Key used to reference into managed array
	 * @return {*}
	 */
	expandName(_ident: string): string | object {
		// Check whether the identifier refers to an index in the content array
		const is_index_in_content = _ident.charAt(0) == '@';

		// Check whether "$" occurs in the given identifier
		const pos_var = _ident.indexOf('$');
		if (pos_var >= 0 && (this.perspectiveData.row != null || !_ident.match(/\$\{?row\}?/))) {
			// Get the content array for the current row
			const row = typeof this.perspectiveData.row == 'number' ? this.perspectiveData.row : '';
			const row_cont = this.data[row] || {};
			// $cont is NOT root but current name-space in old eTemplate
			const cont = this.data;//getRoot().data;
			const _cont = this.data;// according to a grep only used in ImportExport just twice

			// Check whether the expression has already been compiled - if not,
			// try to compile it first. If an error occurs, the identifier
			// function is set to null
			if (typeof et2_arrayMgr.compiledExpressions[_ident] == "undefined") {
				try {
					if (this.perspectiveData.row == null) {
						// No row, compile for only top level content
						// @ts-ignore
						et2_arrayMgr.compiledExpressions[_ident] = et2_compilePHPExpression(
							_ident, ["cont", "_cont"]);
					} else {
						// @ts-ignore
						et2_arrayMgr.compiledExpressions[_ident] = et2_compilePHPExpression(
							_ident, ["row", "cont", "row_cont", "_cont"]);
					}
				} catch (e) {
					et2_arrayMgr.compiledExpressions[_ident] = null;
					egw.debug("error", "Error while compiling PHP->JS ", e);
				}
			}

			// Execute the previously compiled expression, if it is not "null"
			// because compilation failed. The parameters have to be in the same
			// order as defined during compilation.
			if (et2_arrayMgr.compiledExpressions[_ident]) {
				try {
					if (this.perspectiveData.row == null) {
						// No row, exec with only top level content
						_ident = et2_arrayMgr.compiledExpressions[_ident](cont, _cont);
					} else {
						_ident = et2_arrayMgr.compiledExpressions[_ident](row, cont, row_cont, _cont);
					}
				} catch (e) {
					// only log error, as they are no real errors but missing data
					egw.debug("log", typeof e == 'object' ? e.message : e);
					_ident = null;
				}
			}
		}

		if (is_index_in_content && _ident) {
			// If an additional "@" is specified, this means that we have to return
			// the entry from the root element
			if (_ident.charAt(1) == '@') {
				return this.getRoot().getEntry(_ident.substr(2));
			} else {
				return this.getEntry(_ident.substr(1));
			}
		}

		return _ident;
	}

	parseBoolExpression(_expression: string) {
		// If the first char of the expression is a '!' this means, that the value
		// is to be negated.
		if (_expression.charAt(0) == '!') {
			return !this.parseBoolExpression(_expression.substr(1));
		}

		// Split the expression at a possible "="
		const parts = _expression.split('=');

		// Expand the first value
		let val = this.expandName(parts[0]);
		val = typeof val == "undefined" ? ''  : '' + val;

		// If a second expression existed, test that one
		if (typeof parts[1] != "undefined") {
			// Expand the second value
			const checkVal = '' + this.expandName(parts[1]);

			// Values starting with / are treated as regular expression. It is
			// checked whether the first value matches the regular expression
			if (checkVal.charAt(0) == '/') {
				return (new RegExp(checkVal.substr(1, checkVal.length - 2)))
					.test(val);
			}

			// Otherwise check for simple equality
			return val == checkVal;
		}

		return et2_evalBool(val);
	}

	/**
	 * ?
	 *
	 * @param {object} _owner owner object
	 * @param {(string|null|object)} _root string with key, null for whole data or object with data
	 * @param {number?} _row key for into the _root for the desired row
	 */
	openPerspective(_owner: et2_widget, _root: (string | null | object), _row: number | null): et2_arrayMgr {
		// Get the root node
		let root = typeof _root == "string" ? this.data[_root] :
			(_root == null ? this.data : _root);
		if (typeof root == "undefined" && typeof _root == "string") root = this.getEntry(_root);

		// Create a new content array manager with the given root
		const constructor = this.readOnly ? et2_readonlysArrayMgr : et2_arrayMgr;
		const mgr = new constructor(root, this);

		// Set the owner
		mgr.perspectiveData.owner = _owner;

		// Set the root key
		if (typeof _root == "string") {
			mgr.perspectiveData.key = _root;
		}

		// Set _row parameter
		if (typeof _row != "undefined") {
			mgr.perspectiveData.row = _row;
		}

		return mgr;
	}

}

/**
 * @augments et2_arrayMgr
 */
export class et2_readonlysArrayMgr extends et2_arrayMgr {

	readOnly : boolean = true;

	/**
	 * Find out if the given ID is readonly, according to the array data
	 *
	 * @memberOf et2_readonlysArrayMgr
	 * @param _id
	 * @param _attr
	 * @param _parent
	 * @returns
	 */
	isReadOnly(_id: string, _attr: string, _parent?: et2_arrayMgr): boolean | string {
		let entry = null;

		if (_id != null) {
			if (_id.indexOf('$') >= 0 || _id.indexOf('@') >= 0) {
				_id = this.expandName(_id);
			}
			// readonlys was not namespaced in old eTemplate, therefore if we dont find data
			// under current namespace, we look into parent
			// (if there is anything namespaced, we will NOT look for parent!)
			let mgr: et2_arrayMgr = this;
			while (mgr.getParentMgr() && jQuery.isEmptyObject(mgr.data)) {
				mgr = mgr.getParentMgr();
			}
			entry = mgr.getEntry(_id);
		}

		// Let the array entry override the read only attribute entry
		if (typeof entry != "undefined" && !(typeof entry === 'object')) {
			return entry;
		}

		// If the attribute is set, return that
		if (typeof _attr != "undefined" && _attr !== null) {
			// Accept 'editable', but otherwise boolean
			return this.expandName(_attr) === 'editable' ? 'editable' : et2_evalBool(_attr);
		}

		// Otherwise take into accounf whether the parent is readonly
		if (typeof _parent != "undefined" && _parent) {
			return true;
		}

		// Otherwise return the default value
		entry = this.getEntry("__ALL__");
		return entry !== null && (typeof entry != "undefined");
	}

	/**
	 * Override parent to handle cont and row_cont.
	 *
	 * Normally these should refer to the readonlys data, but that's not
	 * useful, so we use the owner inside perspective data to expand using content.
	 *
	 * @param {string} ident Key for searching into the array.
	 * @returns {*}
	 */
	expandName(ident: string): any {
		return this.perspectiveData.owner.getArrayMgr('content').expandName(ident);
	}
}

/**
 * Creates a new set of array managers
 *
 * @param _owner is the owner object of the array managers - this object (a widget)
 *    will free the array manager
 * @param _mgrs is the original set of array managers, the array managers are
 *    inside an associative array as recived from et2_widget::getArrayMgrs()
 * @param _data is an associative array of new data which will be merged into the
 *    existing array managers.
 * @param _row is the row for which the array managers will be opened.
 */
export function et2_arrayMgrs_expand(_owner: et2_widget, _mgrs: object, _data: object, _row: number) {
	// Create a copy of the given _mgrs associative array
	let result = {};

	// Merge the given data associative array into the existing array managers
	for (let key in _mgrs) {
		result[key] = _mgrs[key];

		if (typeof _data[key] != "undefined") {
			// Open a perspective for the given data row
			let rowData = {};
			rowData[_row] = _data[key];

			result[key] = _mgrs[key].openPerspective(_owner, rowData, _row);
		}
	}

	// Return the resulting managers object
	return result;
}