/**
 * Color group with five container variants and an OnContainer text color.
 */
export interface ThemeColorGroup {
  container: string;
  containerHover: string;
  containerActive: string;
  containerLine: string;
  onContainer: string;
}

/**
 * Color group for interactive palette entries (Main + Container sub-groups).
 */
export interface ThemePaletteGroup {
  main: string;
  mainHover: string;
  mainActive: string;
  mainLine: string;
  onMain: string;
  container: string;
  containerHover: string;
  containerActive: string;
  containerLine: string;
  onContainer: string;
}

/**
 * Full color token set for a plugin theme.
 * Property names map directly to the folds design-token contract.
 */
export interface PluginThemeColors {
  background: ThemeColorGroup;
  surface: ThemeColorGroup;
  surfaceVariant: ThemeColorGroup;
  primary: ThemePaletteGroup;
  secondary: ThemePaletteGroup;
  success: ThemePaletteGroup;
  warning: ThemePaletteGroup;
  critical: ThemePaletteGroup;
  other: {
    focusRing: string;
    shadow: string;
    overlay: string;
  };
}

/**
 * Theme definition supplied by a plugin.
 */
export interface PluginTheme {
  id: string;
  name: string;
  kind: 'light' | 'dark';
  colors: PluginThemeColors;
  /** Optional extra CSS injected alongside the theme variables. */
  extraCss?: string;
}

/**
 * A command argument definition.
 */
export interface CommandArg {
  name: string;
  type?: 'string' | 'number' | 'boolean';
  required?: boolean;
  description?: string;
}

/**
 * A command registered by a plugin.
 */
export interface PluginCommand {
  name: string;
  description?: string;
  args?: string[] | CommandArg[];
  run: (args: Record<string, unknown>, ctx: PluginContext) => string | void | Promise<string | void>;
}

/** Callback invoked for outgoing or incoming messages. */
export type MessageInterceptor = (msg: MessageContext) => void | Promise<void>;

/**
 * Message context passed to interceptors.
 */
export interface MessageContext {
  content: string;
  roomId: string;
  eventType: string;
  formatted?: string;
  metadata?: Record<string, unknown>;
}

/**
 * Custom renderer function.
 * The return type is `unknown` so the package stays framework-agnostic.
 * Hosts using React should cast to `ReactNode` at the call-site.
 */
export type CustomRenderer = (data: unknown, defaultRenderer?: () => unknown) => unknown;

/**
 * A single setting definition within a plugin's settings schema.
 */
export interface SettingDefinition {
  type: 'string' | 'number' | 'boolean' | 'select' | 'color';
  label?: string;
  description?: string;
  default?: unknown;
  options?: Array<{ value: unknown; label: string }>;
}

/** The full settings schema for a plugin. */
export type SettingsSchema = Record<string, SettingDefinition>;

/**
 * Options for a notification emitted by a plugin.
 */
export interface NotificationOptions {
  title: string;
  body: string;
  type?: 'info' | 'success' | 'error' | 'warning';
  duration?: number;
  actions?: Array<{ label: string; action: () => void }>;
}

/**
 * The context provided to plugins when they are initialized.
 * All APIs are available through this object.
 */
export interface PluginContext {
  /** Plugin ID */
  pluginId: string;

  /** Commands API */
  commands: {
    register: (command: PluginCommand) => void;
    unregister: (name: string) => void;
    execute: (name: string, args: Record<string, unknown>) => Promise<string | void>;
  };

  /** Messages API */
  messages: {
    onBeforeSend: (interceptor: MessageInterceptor) => void;
    onReceive: (interceptor: MessageInterceptor) => void;
  };

  /** UI API — framework-agnostic renderer registry */
  ui: {
    registerRenderer: (type: string, renderer: CustomRenderer) => void;
    unregisterRenderer: (type: string) => void;
    registerButton: (button: UIButtonDefinition) => void;
    unregisterButton: (buttonId: string) => void;
  };

  /** Settings API */
  settings: {
    define: (schema: SettingsSchema) => void;
    get: <T = unknown>(key: string) => T | undefined;
    set: (key: string, value: unknown) => void;
  };

  /** Themes API */
  themes: {
    register: (theme: PluginTheme) => void;
    unregister: (themeId: string) => void;
  };

  /**
   * Generic event emitter API.
   * Wire up any event client (Matrix, socket.io, Node EventEmitter, etc.)
   * via the `eventClient` option passed to `createPluginContext`.
   */
  events: {
    on: (eventType: string, handler: (...args: any[]) => void) => void;
    off: (eventType: string, handler: (...args: any[]) => void) => void;
  };

  /** Background tasks API */
  timers: {
    setInterval: (callback: () => void, ms: number) => number;
    setTimeout: (callback: () => void, ms: number) => number;
    clearInterval: (id: number) => void;
    clearTimeout: (id: number) => void;
  };

  /** Send a notification through the host application. */
  notify: (options: NotificationOptions | string) => void | Promise<void>;

  /** Logging API */
  log: (...args: any[]) => void;
  warn: (...args: any[]) => void;
  error: (...args: any[]) => void;

  /** Require another loaded plugin's exports. */
  require: (pluginId: string) => unknown;
}

/**
 * Custom settings section that a plugin can inject into the settings UI.
 * The `component` value is `unknown` to remain framework-agnostic.
 * Hosts using React should treat it as `ReactNode`.
 */
export interface PluginSettingsSection {
  id: string;
  name: string;
  icon?: string;
  component: unknown;
}

/** UI locations where plugins can inject content. */
export type UILocation =
  | 'room-header'
  | 'message-actions'
  | 'user-menu'
  | 'room-menu'
  | 'composer-actions'
  | 'channel-list'
  | 'direct-messages'
  | 'home-section'
  | 'search-notification-section'
  | 'text-composer-toolbar'
  | 'sidebar-actions';

/**
 * Button positioning configuration for plugins.
 * Allows buttons to be placed before or after existing elements or groups.
 */
export interface UIButtonPosition {
  /** Place button before this element/group ID */
  before?: string;
  /** Place button after this element/group ID */
  after?: string;
  /** 
   * Optional group ID this button belongs to.
   * Buttons in the same group are rendered together.
   */
  group?: string;
  /** Order within the group (lower numbers appear first) */
  order?: number;
}

/**
 * Definition for a UI button registered by a plugin.
 * Framework-agnostic - the component/element is passed as unknown.
 */
export interface UIButtonDefinition {
  /** Unique ID for this button */
  id: string;
  /** Location where the button should appear */
  location: UILocation;
  /** Button label or tooltip */
  label: string;
  /** Optional icon identifier */
  icon?: string;
  /** Positioning configuration */
  position?: UIButtonPosition;
  /** 
   * The actual button component or render function.
   * Framework-agnostic - hosts using React should cast to ReactNode.
   */
  component: unknown;
  /** Optional callback when clicked (if component doesn't handle it) */
  onClick?: () => void | Promise<void>;
}

/**
 * The main plugin interface that all plugins must implement.
 */
export interface Plugin {
  name?: string;
  version?: string;
  dependencies?: Record<string, string>;

  /** Called when the plugin is loaded. */
  onLoad: (context: PluginContext) => void | Promise<void>;

  /** Called when the plugin is unloaded or disabled. */
  onUnload?: () => void | Promise<void>;

  /** Exposed API surface for other plugins to consume via `context.require()`. */
  exports?: unknown;
}

/**
 * A single log entry produced by a plugin.
 */
export interface PluginLogEntry {
  pluginId: string;
  level: 'log' | 'warn' | 'error';
  timestamp: number;
  args: unknown[];
}