import GObject, { register, property, signal } from "astal/gobject";
import { ConnectionInstantiationError, NotImplementedError } from "./errors";
import {
  OutputAdapter,
  OutputConfig,
  VSOutputAdapter,
  VSOutputEvent,
  VSWorkspaceAdapter,
  VSWorkspaceEvent,
} from "./types";

/**
 * Mid-level abstract compositor connection providing raw data about the compositor to the rest of VoidShell.
 * Wraps the low-level compositor-specific IPC APIs with a common interface that other services can build on top of.
 *
 * This should generally only be utilized directly by the high-level compositor-related services (workspaces,
 * contexts, etc.). Other services should generally interact with the compositor via these high-level services.
 */
@register({
  GTypeName: "AbstractCompositorConnection",
})
export class CompositorConnection extends GObject.Object {
  constructor() {
    if (CompositorConnection._instance !== undefined) {
      throw new ConnectionInstantiationError(
        "Cannot create a CompositorConnection where one already exists",
      );
    }
    super();
    if (Object.getPrototypeOf(this) === CompositorConnection.prototype) {
      throw new ConnectionInstantiationError(
        "Cannnot instantiate abstract CompositorConnection",
      );
    }
    CompositorConnection._instance = this;
  }

  static _instance: CompositorConnection | undefined;

  static get instance() {
    if (this._instance === undefined) {
      throw new Error(
        "Must instantiate a CompositorConnection before attempting to retrieve instance",
      );
    }
    return this._instance;
  }

  /**
   * Focus a workspace by ID
   * @param workspaceId The workspace to focus
   */
  async focusWorkspace(workspaceId: string): Promise<void> {
    throw new NotImplementedError();
  }

  /**
   * Move a workspace to a different output
   * @param workspaceId The workspace to move
   * @param outputName The output to move the workspace to
   */
  async moveWorkspace(workspaceId: string, outputName: string): Promise<void> {
    throw new NotImplementedError();
  }

  /**
   * Focus an output
   * @param outputName The output to focus
   */
  async focusOutput(outputName: string): Promise<void> {
    throw new NotImplementedError();
  }
  /**
   * Move the focused container to the given workspace
   * @param workspaceId The workspace to move the container to
   */
  async moveContainer(workspaceId: string): Promise<void> {
    throw new NotImplementedError();
  }

  /**
   * Configure an output
   * @param outputName The name of the output to configure
   * @param config The configuration object for the output
   */
  async configureOutput(
    outputName: string,
    config: OutputConfig,
  ): Promise<void> {
    throw new NotImplementedError();
  }

  /**
   * Gets a list of all connected outputs
   * @returns a list of VSOutputAdapter objects representing the connected outputs
   */
  async getOutputs(): Promise<VSOutputAdapter[]> {
    throw new NotImplementedError();
  }

  /**
   * Gets a list of all workspaces
   * @returns a list of VSWorkspaceAdapter objects representing the workspaces presently known to the compositor
   */
  async getWorkspaces(): Promise<VSWorkspaceAdapter[]> {
    throw new NotImplementedError();
  }

  /**
   * Disable an output
   * @param outputName The name of the output to disable
   */
  async disableOutput(outputName: string): Promise<void> {
    throw new NotImplementedError();
  }

  /**
   * Set an output property without fully reconfiguring the output
   */
  async setOutputProperty<Prop extends string & keyof OutputConfig>(
    property: Prop,
    value: Exclude<OutputConfig[Prop], undefined>,
  ) {
    throw new NotImplementedError();
  }

  /**
   * Emitted when a workspace's data changes
   */
  @signal(VSWorkspaceEvent)
  declare workspaceChange: (event: VSWorkspaceEvent) => void;

  /**
   * Emitted when an output's data changes
   * For example, it is enabled or disabled, or its mode changes
   */
  @signal(VSOutputEvent)
  declare outputChange: (event: VSOutputEvent) => void;

  /**
   * Emitted when the binding mode changes
   */
  @signal(String)
  declare modeChange: (event: string) => void;
}