/**
*	Task type definition.
*
*	@typedef {Object} taskType
*	@property {string} id - The unique id of the task.
*	@property {string} text - The title of the task.
*	@property {Date} startDate - The start date of the task.
*	@property {number} days - The duration in days of the task.
*	@property {Array<number>} [dependencies] - The optional list of tasks this tasks depends upon.
*/
export declare type taskType = {
	id: number;
	text: string;
	startDate: Date;
	days: number;
	dependencies?: Array<number>;
};

/**
*	Tree column type definition.
*
*	@typedef {Object} headerColumnType
*	@property {string} id - The unique id of the column.
*	@property {string} title - The title of the column.
*	@property {string} [width] - The optional width in pixel of the column.
*/
export declare type headerColumnType = {
	id: string;
	title: string;
	width?: number;
};

/**
*	Gantt chart configuration options type definition.
*
*	@typedef {Object} optionsType
*	@property {number} [treeWidthPercentage] - The percentual width of the tree.
*	@property {Array<headerColumnType>} [columns] - The columns of the tree.
*/
export declare type optionsType = {
	treeWidthPercentage?: number;
	columns?: Array<headerColumnType>;
};

/**
*	Task click callback.
*/
export type callbackTaskClickType = (task: taskType) => void;

/**
* Gantt Chart.
*/
export declare class GanttChart {
	/**
	*	Constructor.
	*
	*	@example const gantt = new GanttChart();
	*/
	constructor();
	
	/**
	*	Set configuration options.
	*
	*	@param {optionsType} options - The configuration object.
	*
	*	@example gantt.setConfig({treeWidthPercentage: 50});
	*/
	setConfig(options: optionsType): void;
	
	/**
	*	Set the tasks and dependencies.
	*
	*	@param {Array<taskType>} tasks - The tasks in the prject.
	*
	*	@example
	*
	*	gantt.setData([
	*		{id: 1, text: 'Planning', startDate: new Date('2020-01-01'), days: 1},
	*		{id: 2, text: 'Analysis', startDate: new Date('2020-01-02'), days: 1, dependencies: [1]},
	*	]);
	*
	*/
	
	setData(tasks: Array<taskType>): void;

	/**
	*	Attach a callback event when a task has been clicked.
	*
	*	@param {'click'|'dblclick'} event - The click event to wait for.
	*	@param {callbackTaskClickType} callback - The callback function when a task receives a click event.
	*
	*	@example
	*
	*	gantt.attachTaskClickEvent('click', (task: taskType) => alert(`clicked on task ${task.id}`));
	*
	*/
	attachTaskClickEvent(event: 'click'|'dblclick', callback: callbackTaskClickType): void;

	/**
	*	Render the gantt chart in a given element.
	*
	*	@param {HTMLElement} container - The container element.
	*
	*	@example gantt.render(document.getElementById('gantt_here'));
	*/
	render(container: HTMLElement): void;
}