/**
 * @license MIT
 *
 * This contains the type declarations for the xterm.js library. Note that
 * some interfaces differ between this file and the actual implementation in
 * src/, that's because this file declares the *public* API which is intended
 * to be stable and consumed by external programs.
 */

/**
 * An object containing start up options for the terminal.
 */
interface ITerminalOptions {
  /**
   * A data uri of the sound to use for the bell (needs bellStyle = 'sound').
   */
  bellSound?: string;

  /**
   * The type of the bell notification the terminal will use.
   */
  bellStyle?: 'none' | 'visual' | 'sound' | 'both';

  /**
   * The number of columns in the terminal.
   */
  cols?: number;

  /**
   * Whether the cursor blinks.
   */
  cursorBlink?: boolean;

  /**
   * The style of the cursor.
   */
  cursorStyle?: 'block' | 'underline' | 'bar';

  /**
   * Whether input should be disabled.
   */
  disableStdin?: boolean;

  /**
   * The number of rows in the terminal.
   */
  rows?: number;

  /**
   * The amount of scrollback in the terminal. Scrollback is the amount of rows
   * that are retained when lines are scrolled beyond the initial viewport.
   */
  scrollback?: number;

  /**
   * The size of tab stops in the terminal.
   */
  tabStopWidth?: number;
}

/**
 * An object containing options for a link matcher.
 */
interface ILinkMatcherOptions {
  /**
   * The index of the link from the regex.match(text) call. This defaults to 0
   * (for regular expressions without capture groups).
   */
  matchIndex?: number;

  /**
   * A callback that validates an individual link, returning true if valid and
   * false if invalid.
   */
  validationCallback?: (uri: string, element: HTMLElement, callback: (isValid: boolean) => void) => void;

  /**
   * The priority of the link matcher, this defines the order in which the link
   * matcher is evaluated relative to others, from highest to lowest. The
   * default value is 0.
   */
  priority?: number;
}

declare module 'xterm' {
  /**
   * The class that represents an xterm.js terminal.
   */
  export class Terminal {
    element: HTMLElement;
    textarea: HTMLTextAreaElement;

    /**
     * Creates a new `Terminal` object.
     *
     * @param options An object containing a set of options.
     */
    constructor(options?: ITerminalOptions);

    /**
     * Unfocus the terminal.
     */
    blur(): void;

    /**
     * Focus the terminal.
     */
    focus(): void;

    /**
     * Registers an event listener.
     * @param type The type of the event.
     * @param listener The listener.
     */
    on(type: 'blur' | 'focus' | 'lineFeed', listener: () => void): void;
    /**
     * Registers an event listener.
     * @param type The type of the event.
     * @param listener The listener.
     */
    on(type: 'data', listener: (data?: string) => void): void;
    /**
     * Registers an event listener.
     * @param type The type of the event.
     * @param listener The listener.
     */
    on(type: 'key', listener: (key?: string, event?: KeyboardEvent) => void): void;
    /**
     * Registers an event listener.
     * @param type The type of the event.
     * @param listener The listener.
     */
    on(type: 'keypress' | 'keydown', listener: (event?: KeyboardEvent) => void): void;
    /**
     * Registers an event listener.
     * @param type The type of the event.
     * @param listener The listener.
     */
    on(type: 'refresh', listener: (data?: {start: number, end: number}) => void): void;
    /**
     * Registers an event listener.
     * @param type The type of the event.
     * @param listener The listener.
     */
    on(type: 'resize', listener: (data?: {cols: number, rows: number}) => void): void;
    /**
     * Registers an event listener.
     * @param type The type of the event.
     * @param listener The listener.
     */
    on(type: 'scroll', listener: (ydisp?: number) => void): void;
    /**
     * Registers an event listener.
     * @param type The type of the event.
     * @param listener The listener.
     */
    on(type: 'title', listener: (title?: string) => void): void;

    /**
     * Deregisters an event listener.
     * @param type The type of the event.
     * @param listener The listener.
     */
    off(type: 'blur' | 'focus' | 'lineFeed' | 'data' | 'key' | 'keypress' | 'keydown' | 'refresh' | 'resize' | 'scroll' | 'title', listener: (...args: any[]) => void): void;

    /**
     * Resizes the terminal.
     * @param x The number of columns to resize to.
     * @param y The number of rows to resize to.
     */
    resize(columns: number, rows: number): void;

    /**
     * Writes text to the terminal, followed by a break line character (\n).
     * @param data The text to write to the terminal.
     */
    writeln(data: string): void;

    /**
     * Opens the terminal within an element.
     * @param parent The element to create the terminal within.
     */
    open(parent: HTMLElement): void;

    /**
     * Attaches a custom key event handler which is run before keys are
     * processed, giving consumers of xterm.js ultimate control as to what keys
     * should be processed by the terminal and what keys should not.
     * @param customKeyEventHandler The custom KeyboardEvent handler to attach.
     * This is a function that takes a KeyboardEvent, allowing consumers to stop
     * propogation and/or prevent the default action. The function returns
     * whether the event should be processed by xterm.js.
     */
    attachCustomKeyEventHandler(customKeyEventHandler: (event: KeyboardEvent) => boolean): void;

    /**
     * (EXPERIMENTAL) Registers a link matcher, allowing custom link patterns to
     * be matched and handled.
     * @param regex The regular expression to search for, specifically this
     * searches the textContent of the rows. You will want to use \s to match a
     * space ' ' character for example.
     * @param handler The callback when the link is called.
     * @param options Options for the link matcher.
     * @return The ID of the new matcher, this can be used to deregister.
     */
    registerLinkMatcher(regex: RegExp, handler: (event: MouseEvent, uri: string) => boolean | void , options?: ILinkMatcherOptions): number;

    /**
     * (EXPERIMENTAL) Deregisters a link matcher if it has been registered.
     * @param matcherId The link matcher's ID (returned after register)
     */
    deregisterLinkMatcher(matcherId: number): void;

    /**
     * Gets whether the terminal has an active selection.
     */
    hasSelection(): boolean;

    /**
     * Gets the terminal's current selection, this is useful for implementing
     * copy behavior outside of xterm.js.
     */
    getSelection(): string;

    /**
     * Clears the current terminal selection.
     */
    clearSelection(): void;

    /**
     * Selects all text within the terminal.
     */
    selectAll(): void;

    // /**
    //  * Find the next instance of the term, then scroll to and select it. If it
    //  * doesn't exist, do nothing.
    //  * @param term Tne search term.
    //  * @return Whether a result was found.
    //  */
    // findNext(term: string): boolean;

    // /**
    //  * Find the previous instance of the term, then scroll to and select it. If it
    //  * doesn't exist, do nothing.
    //  * @param term Tne search term.
    //  * @return Whether a result was found.
    //  */
    // findPrevious(term: string): boolean;

    /**
     * Destroys the terminal and detaches it from the DOM.
     */
    destroy(): void;

    /**
     * Scroll the display of the terminal
     * @param amount The number of lines to scroll down (negative scroll up).
     */
    scrollDisp(amount: number): void;

    /**
     * Scroll the display of the terminal by a number of pages.
     * @param pageCount The number of pages to scroll (negative scrolls up).
     */
    scrollPages(pageCount: number): void;

    /**
     * Scrolls the display of the terminal to the top.
     */
    scrollToTop(): void;

    /**
     * Scrolls the display of the terminal to the bottom.
     */
    scrollToBottom(): void;

    /**
     * Clear the entire buffer, making the prompt line the new first line.
     */
    clear(): void;

    /**
     * Writes text to the terminal.
     * @param data The text to write to the terminal.
     */
    write(data: string): void;

    /**
     * Retrieves an option's value from the terminal.
     * @param key The option key.
     */
    getOption(key: 'bellSound' | 'bellStyle' | 'cursorStyle' | 'termName'): string;
    /**
     * Retrieves an option's value from the terminal.
     * @param key The option key.
     */
    getOption(key: 'cancelEvents' | 'convertEol' | 'cursorBlink' | 'debug' | 'disableStdin' | 'popOnBell' | 'screenKeys' | 'useFlowControl' | 'visualBell'): boolean;
    /**
     * Retrieves an option's value from the terminal.
     * @param key The option key.
     */
    getOption(key: 'colors'): string[];
    /**
     * Retrieves an option's value from the terminal.
     * @param key The option key.
     */
    getOption(key: 'cols' | 'rows' | 'tabStopWidth' | 'scrollback'): number;
    /**
     * Retrieves an option's value from the terminal.
     * @param key The option key.
     */
    getOption(key: 'geometry'): [number, number];
    /**
     * Retrieves an option's value from the terminal.
     * @param key The option key.
     */
    getOption(key: 'handler'): (data: string) => void;

    /**
     * Sets an option on the terminal.
     * @param key The option key.
     * @param value The option value.
     */
    setOption(key: 'termName' | 'bellSound', value: string): void;
    /**
     * Sets an option on the terminal.
     * @param key The option key.
     * @param value The option value.
     */
    setOption(key: 'bellStyle', value: 'none' | 'visual' | 'sound' | 'both'): void;
    /**
     * Sets an option on the terminal.
     * @param key The option key.
     * @param value The option value.
     */
    setOption(key: 'cursorStyle', value: 'block' | 'underline' | 'bar'): void;
    /**
     * Sets an option on the terminal.
     * @param key The option key.
     * @param value The option value.
     */
    setOption(key: 'cancelEvents' | 'convertEol' | 'cursorBlink' | 'debug' | 'disableStdin' | 'popOnBell' | 'screenKeys' | 'useFlowControl' | 'visualBell', value: boolean): void;
    /**
     * Sets an option on the terminal.
     * @param key The option key.
     * @param value The option value.
     */
    setOption(key: 'colors', value: string[]): void;
    /**
     * Sets an option on the terminal.
     * @param key The option key.
     * @param value The option value.
     */
    setOption(key: 'cols' | 'rows' | 'tabStopWidth' | 'scrollback', value: number): void;
    /**
     * Sets an option on the terminal.
     * @param key The option key.
     * @param value The option value.
     */
    setOption(key: 'geometry', value: [number, number]): void;
    /**
     * Sets an option on the terminal.
     * @param key The option key.
     * @param value The option value.
     */
    setOption(key: 'handler', value: (data: string) => void): void;

    /**
     * Tells the renderer to refresh terminal content between two rows
     * (inclusive) at the next opportunity.
     * @param start The row to start from (between 0 and this.rows - 1).
     * @param end The row to end at (between start and this.rows - 1).
     */
    refresh(start: number, end: number): void;

    /**
     * Perform a full reset (RIS, aka '\x1bc').
     */
    reset(): void

    /**
     * Loads an addon, attaching it to the Terminal prototype and making it
     * available to all newly created Terminals.
     * @param addon The addon to load.
     */
    static loadAddon(addon: 'attach' | 'fit' | 'fullscreen' | 'search' | 'terminado'): void;
  }
}