/**
 * Extension system types.
 *
 * Extensions are TypeScript modules that can:
 * - Subscribe to agent lifecycle events
 * - Register LLM-callable tools
 * - Register commands, keyboard shortcuts, and CLI flags
 * - Interact with the user via UI primitives
 */
import type { AgentMessage, AgentToolResult, AgentToolUpdateCallback, ThinkingLevel } from "@mariozechner/pi-agent-core";
import type { Api, AssistantMessageEvent, AssistantMessageEventStream, Context, ImageContent, Model, OAuthCredentials, OAuthLoginCallbacks, SimpleStreamOptions, TextContent, ToolResultMessage } from "@mariozechner/pi-ai";
import type { AutocompleteItem, Component, EditorComponent, EditorTheme, KeyId, OverlayHandle, OverlayOptions, TUI } from "@mariozechner/pi-tui";
import type { Static, TSchema } from "@sinclair/typebox";
import type { Theme } from "../../modes/interactive/theme/theme.js";
import type { BashResult } from "../bash-executor.js";
import type { CompactionPreparation, CompactionResult } from "../compaction/index.js";
import type { EventBus } from "../event-bus.js";
import type { ExecOptions, ExecResult } from "../exec.js";
import type { ReadonlyFooterDataProvider } from "../footer-data-provider.js";
import type { KeybindingsManager } from "../keybindings.js";
import type { CustomMessage } from "../messages.js";
import type { ModelRegistry } from "../model-registry.js";
import type { BranchSummaryEntry, CompactionEntry, ReadonlySessionManager, SessionEntry, SessionManager } from "../session-manager.js";
import type { SlashCommandInfo } from "../slash-commands.js";
import type { SourceInfo } from "../source-info.js";
import type { BashOperations } from "../tools/bash.js";
import type { EditToolDetails } from "../tools/edit.js";
import type { BashToolDetails, BashToolInput, EditToolInput, FindToolDetails, FindToolInput, GrepToolDetails, GrepToolInput, LsToolDetails, LsToolInput, ReadToolDetails, ReadToolInput, WriteToolInput } from "../tools/index.js";
export type { ExecOptions, ExecResult } from "../exec.js";
export type { AgentToolResult, AgentToolUpdateCallback };
export type { AppKeybinding, KeybindingsManager } from "../keybindings.js";
/** Options for extension UI dialogs. */
export interface ExtensionUIDialogOptions {
    /** AbortSignal to programmatically dismiss the dialog. */
    signal?: AbortSignal;
    /** Timeout in milliseconds. Dialog auto-dismisses with live countdown display. */
    timeout?: number;
}
/** Placement for extension widgets. */
export type WidgetPlacement = "aboveEditor" | "belowEditor";
/** Options for extension widgets. */
export interface ExtensionWidgetOptions {
    /** Where the widget is rendered. Defaults to "aboveEditor". */
    placement?: WidgetPlacement;
}
/** Raw terminal input listener for extensions. */
export type TerminalInputHandler = (data: string) => {
    consume?: boolean;
    data?: string;
} | undefined;
/**
 * UI context for extensions to request interactive UI.
 * Each mode (interactive, RPC, print) provides its own implementation.
 */
export interface ExtensionUIContext {
    /** Show a selector and return the user's choice. */
    select(title: string, options: string[], opts?: ExtensionUIDialogOptions): Promise<string | undefined>;
    /** Show a confirmation dialog. */
    confirm(title: string, message: string, opts?: ExtensionUIDialogOptions): Promise<boolean>;
    /** Show a text input dialog. */
    input(title: string, placeholder?: string, opts?: ExtensionUIDialogOptions): Promise<string | undefined>;
    /** Show a notification to the user. */
    notify(message: string, type?: "info" | "warning" | "error"): void;
    /** Listen to raw terminal input (interactive mode only). Returns an unsubscribe function. */
    onTerminalInput(handler: TerminalInputHandler): () => void;
    /** Set status text in the footer/status bar. Pass undefined to clear. */
    setStatus(key: string, text: string | undefined): void;
    /** Set the working/loading message shown during streaming. Call with no argument to restore default. */
    setWorkingMessage(message?: string): void;
    /** Set the label shown for hidden thinking blocks. Call with no argument to restore default. */
    setHiddenThinkingLabel(label?: string): void;
    /** Set a widget to display above or below the editor. Accepts string array or component factory. */
    setWidget(key: string, content: string[] | undefined, options?: ExtensionWidgetOptions): void;
    setWidget(key: string, content: ((tui: TUI, theme: Theme) => Component & {
        dispose?(): void;
    }) | undefined, options?: ExtensionWidgetOptions): void;
    /** Set a custom footer component, or undefined to restore the built-in footer.
     *
     * The factory receives a FooterDataProvider for data not otherwise accessible:
     * git branch and extension statuses from setStatus(). Token stats, model info,
     * etc. are available via ctx.sessionManager and ctx.model.
     */
    setFooter(factory: ((tui: TUI, theme: Theme, footerData: ReadonlyFooterDataProvider) => Component & {
        dispose?(): void;
    }) | undefined): void;
    /** Set a custom header component (shown at startup, above chat), or undefined to restore the built-in header. */
    setHeader(factory: ((tui: TUI, theme: Theme) => Component & {
        dispose?(): void;
    }) | undefined): void;
    /** Set the terminal window/tab title. */
    setTitle(title: string): void;
    /** Show a custom component with keyboard focus. */
    custom<T>(factory: (tui: TUI, theme: Theme, keybindings: KeybindingsManager, done: (result: T) => void) => (Component & {
        dispose?(): void;
    }) | Promise<Component & {
        dispose?(): void;
    }>, options?: {
        overlay?: boolean;
        /** Overlay positioning/sizing options. Can be static or a function for dynamic updates. */
        overlayOptions?: OverlayOptions | (() => OverlayOptions);
        /** Called with the overlay handle after the overlay is shown. Use to control visibility. */
        onHandle?: (handle: OverlayHandle) => void;
    }): Promise<T>;
    /** Paste text into the editor, triggering paste handling (collapse for large content). */
    pasteToEditor(text: string): void;
    /** Set the text in the core input editor. */
    setEditorText(text: string): void;
    /** Get the current text from the core input editor. */
    getEditorText(): string;
    /** Show a multi-line editor for text editing. */
    editor(title: string, prefill?: string): Promise<string | undefined>;
    /**
     * Set a custom editor component via factory function.
     * Pass undefined to restore the default editor.
     *
     * The factory receives:
     * - `theme`: EditorTheme for styling borders and autocomplete
     * - `keybindings`: KeybindingsManager for app-level keybindings
     *
     * For full app keybinding support (escape, ctrl+d, model switching, etc.),
     * extend `CustomEditor` from `@mariozechner/pi-coding-agent` and call
     * `super.handleInput(data)` for keys you don't handle.
     *
     * @example
     * ```ts
     * import { CustomEditor } from "@mariozechner/pi-coding-agent";
     *
     * class VimEditor extends CustomEditor {
     *   private mode: "normal" | "insert" = "insert";
     *
     *   handleInput(data: string): void {
     *     if (this.mode === "normal") {
     *       // Handle vim normal mode keys...
     *       if (data === "i") { this.mode = "insert"; return; }
     *     }
     *     super.handleInput(data);  // App keybindings + text editing
     *   }
     * }
     *
     * ctx.ui.setEditorComponent((tui, theme, keybindings) =>
     *   new VimEditor(tui, theme, keybindings)
     * );
     * ```
     */
    setEditorComponent(factory: ((tui: TUI, theme: EditorTheme, keybindings: KeybindingsManager) => EditorComponent) | undefined): void;
    /** Get the current theme for styling. */
    readonly theme: Theme;
    /** Get all available themes with their names and file paths. */
    getAllThemes(): {
        name: string;
        path: string | undefined;
    }[];
    /** Load a theme by name without switching to it. Returns undefined if not found. */
    getTheme(name: string): Theme | undefined;
    /** Set the current theme by name or Theme object. */
    setTheme(theme: string | Theme): {
        success: boolean;
        error?: string;
    };
    /** Get current tool output expansion state. */
    getToolsExpanded(): boolean;
    /** Set tool output expansion state. */
    setToolsExpanded(expanded: boolean): void;
}
export interface ContextUsage {
    /** Estimated context tokens, or null if unknown (e.g. right after compaction, before next LLM response). */
    tokens: number | null;
    contextWindow: number;
    /** Context usage as percentage of context window, or null if tokens is unknown. */
    percent: number | null;
}
export interface CompactOptions {
    customInstructions?: string;
    onComplete?: (result: CompactionResult) => void;
    onError?: (error: Error) => void;
}
/**
 * Context passed to extension event handlers.
 */
export interface ExtensionContext {
    /** UI methods for user interaction */
    ui: ExtensionUIContext;
    /** Whether UI is available (false in print/RPC mode) */
    hasUI: boolean;
    /** Current working directory */
    cwd: string;
    /** Session manager (read-only) */
    sessionManager: ReadonlySessionManager;
    /** Model registry for API key resolution */
    modelRegistry: ModelRegistry;
    /** Current model (may be undefined) */
    model: Model<any> | undefined;
    /** Whether the agent is idle (not streaming) */
    isIdle(): boolean;
    /** The current abort signal, or undefined when the agent is not streaming. */
    signal: AbortSignal | undefined;
    /** Abort the current agent operation */
    abort(): void;
    /** Whether there are queued messages waiting */
    hasPendingMessages(): boolean;
    /** Gracefully shutdown pi and exit. Available in all contexts. */
    shutdown(): void;
    /** Get current context usage for the active model. */
    getContextUsage(): ContextUsage | undefined;
    /** Trigger compaction without awaiting completion. */
    compact(options?: CompactOptions): void;
    /** Get the current effective system prompt. */
    getSystemPrompt(): string;
}
/**
 * Extended context for command handlers.
 * Includes session control methods only safe in user-initiated commands.
 */
export interface ExtensionCommandContext extends ExtensionContext {
    /** Wait for the agent to finish streaming */
    waitForIdle(): Promise<void>;
    /** Start a new session, optionally with initialization. */
    newSession(options?: {
        parentSession?: string;
        setup?: (sessionManager: SessionManager) => Promise<void>;
    }): Promise<{
        cancelled: boolean;
    }>;
    /** Fork from a specific entry, creating a new session file. */
    fork(entryId: string): Promise<{
        cancelled: boolean;
    }>;
    /** Navigate to a different point in the session tree. */
    navigateTree(targetId: string, options?: {
        summarize?: boolean;
        customInstructions?: string;
        replaceInstructions?: boolean;
        label?: string;
    }): Promise<{
        cancelled: boolean;
    }>;
    /** Switch to a different session file. */
    switchSession(sessionPath: string): Promise<{
        cancelled: boolean;
    }>;
    /** Reload extensions, skills, prompts, and themes. */
    reload(): Promise<void>;
}
/** Rendering options for tool results */
export interface ToolRenderResultOptions {
    /** Whether the result view is expanded */
    expanded: boolean;
    /** Whether this is a partial/streaming result */
    isPartial: boolean;
}
/** Context passed to tool renderers. */
export interface ToolRenderContext<TState = any, TArgs = any> {
    /** Current tool call arguments. Shared across call/result renders for the same tool call. */
    args: TArgs;
    /** Unique id for this tool execution. Stable across call/result renders for the same tool call. */
    toolCallId: string;
    /** Invalidate just this tool execution component for redraw. */
    invalidate: () => void;
    /** Previously returned component for this render slot, if any. */
    lastComponent: Component | undefined;
    /** Shared renderer state for this tool row. Initialized by tool-execution.ts. */
    state: TState;
    /** Working directory for this tool execution. */
    cwd: string;
    /** Whether the tool execution has started. */
    executionStarted: boolean;
    /** Whether the tool call arguments are complete. */
    argsComplete: boolean;
    /** Whether the tool result is partial/streaming. */
    isPartial: boolean;
    /** Whether the result view is expanded. */
    expanded: boolean;
    /** Whether inline images are currently shown in the TUI. */
    showImages: boolean;
    /** Whether the current result is an error. */
    isError: boolean;
}
/**
 * Tool definition for registerTool().
 */
export interface ToolDefinition<TParams extends TSchema = TSchema, TDetails = unknown, TState = any> {
    /** Tool name (used in LLM tool calls) */
    name: string;
    /** Human-readable label for UI */
    label: string;
    /** Description for LLM */
    description: string;
    /** Optional one-line snippet for the Available tools section in the default system prompt. Custom tools are omitted from that section when this is not provided. */
    promptSnippet?: string;
    /** Optional guideline bullets appended to the default system prompt Guidelines section when this tool is active. */
    promptGuidelines?: string[];
    /** Parameter schema (TypeBox) */
    parameters: TParams;
    /** Optional compatibility shim to prepare raw tool call arguments before schema validation. Must return an object conforming to TParams. */
    prepareArguments?: (args: unknown) => Static<TParams>;
    /** Execute the tool. */
    execute(toolCallId: string, params: Static<TParams>, signal: AbortSignal | undefined, onUpdate: AgentToolUpdateCallback<TDetails> | undefined, ctx: ExtensionContext): Promise<AgentToolResult<TDetails>>;
    /** Custom rendering for tool call display */
    renderCall?: (args: Static<TParams>, theme: Theme, context: ToolRenderContext<TState, Static<TParams>>) => Component;
    /** Custom rendering for tool result display */
    renderResult?: (result: AgentToolResult<TDetails>, options: ToolRenderResultOptions, theme: Theme, context: ToolRenderContext<TState, Static<TParams>>) => Component;
}
/** Fired after session_start to allow extensions to provide additional resource paths. */
export interface ResourcesDiscoverEvent {
    type: "resources_discover";
    cwd: string;
    reason: "startup" | "reload";
}
/** Result from resources_discover event handler */
export interface ResourcesDiscoverResult {
    skillPaths?: string[];
    promptPaths?: string[];
    themePaths?: string[];
}
/** Fired before session manager creation to allow custom session directory resolution */
export interface SessionDirectoryEvent {
    type: "session_directory";
    cwd: string;
}
/** Fired on initial session load */
export interface SessionStartEvent {
    type: "session_start";
}
/** Fired before switching to another session (can be cancelled) */
export interface SessionBeforeSwitchEvent {
    type: "session_before_switch";
    reason: "new" | "resume";
    targetSessionFile?: string;
}
/** Fired after switching to another session */
export interface SessionSwitchEvent {
    type: "session_switch";
    reason: "new" | "resume";
    previousSessionFile: string | undefined;
}
/** Fired before forking a session (can be cancelled) */
export interface SessionBeforeForkEvent {
    type: "session_before_fork";
    entryId: string;
}
/** Fired after forking a session */
export interface SessionForkEvent {
    type: "session_fork";
    previousSessionFile: string | undefined;
}
/** Fired before context compaction (can be cancelled or customized) */
export interface SessionBeforeCompactEvent {
    type: "session_before_compact";
    preparation: CompactionPreparation;
    branchEntries: SessionEntry[];
    customInstructions?: string;
    signal: AbortSignal;
}
/** Fired after context compaction */
export interface SessionCompactEvent {
    type: "session_compact";
    compactionEntry: CompactionEntry;
    fromExtension: boolean;
}
/** Fired on process exit */
export interface SessionShutdownEvent {
    type: "session_shutdown";
}
/** Preparation data for tree navigation */
export interface TreePreparation {
    targetId: string;
    oldLeafId: string | null;
    commonAncestorId: string | null;
    entriesToSummarize: SessionEntry[];
    userWantsSummary: boolean;
    /** Custom instructions for summarization */
    customInstructions?: string;
    /** If true, customInstructions replaces the default prompt instead of being appended */
    replaceInstructions?: boolean;
    /** Label to attach to the branch summary entry */
    label?: string;
}
/** Fired before navigating in the session tree (can be cancelled) */
export interface SessionBeforeTreeEvent {
    type: "session_before_tree";
    preparation: TreePreparation;
    signal: AbortSignal;
}
/** Fired after navigating in the session tree */
export interface SessionTreeEvent {
    type: "session_tree";
    newLeafId: string | null;
    oldLeafId: string | null;
    summaryEntry?: BranchSummaryEntry;
    fromExtension?: boolean;
}
export type SessionEvent = SessionDirectoryEvent | SessionStartEvent | SessionBeforeSwitchEvent | SessionSwitchEvent | SessionBeforeForkEvent | SessionForkEvent | SessionBeforeCompactEvent | SessionCompactEvent | SessionShutdownEvent | SessionBeforeTreeEvent | SessionTreeEvent;
/** Fired before each LLM call. Can modify messages. */
export interface ContextEvent {
    type: "context";
    messages: AgentMessage[];
}
/** Fired before a provider request is sent. Can replace the payload. */
export interface BeforeProviderRequestEvent {
    type: "before_provider_request";
    payload: unknown;
}
/** Fired after user submits prompt but before agent loop. */
export interface BeforeAgentStartEvent {
    type: "before_agent_start";
    prompt: string;
    images?: ImageContent[];
    systemPrompt: string;
}
/** Fired when an agent loop starts */
export interface AgentStartEvent {
    type: "agent_start";
}
/** Fired when an agent loop ends */
export interface AgentEndEvent {
    type: "agent_end";
    messages: AgentMessage[];
}
/** Fired at the start of each turn */
export interface TurnStartEvent {
    type: "turn_start";
    turnIndex: number;
    timestamp: number;
}
/** Fired at the end of each turn */
export interface TurnEndEvent {
    type: "turn_end";
    turnIndex: number;
    message: AgentMessage;
    toolResults: ToolResultMessage[];
}
/** Fired when a message starts (user, assistant, or toolResult) */
export interface MessageStartEvent {
    type: "message_start";
    message: AgentMessage;
}
/** Fired during assistant message streaming with token-by-token updates */
export interface MessageUpdateEvent {
    type: "message_update";
    message: AgentMessage;
    assistantMessageEvent: AssistantMessageEvent;
}
/** Fired when a message ends */
export interface MessageEndEvent {
    type: "message_end";
    message: AgentMessage;
}
/** Fired when a tool starts executing */
export interface ToolExecutionStartEvent {
    type: "tool_execution_start";
    toolCallId: string;
    toolName: string;
    args: any;
}
/** Fired during tool execution with partial/streaming output */
export interface ToolExecutionUpdateEvent {
    type: "tool_execution_update";
    toolCallId: string;
    toolName: string;
    args: any;
    partialResult: any;
}
/** Fired when a tool finishes executing */
export interface ToolExecutionEndEvent {
    type: "tool_execution_end";
    toolCallId: string;
    toolName: string;
    result: any;
    isError: boolean;
}
export type ModelSelectSource = "set" | "cycle" | "restore";
/** Fired when a new model is selected */
export interface ModelSelectEvent {
    type: "model_select";
    model: Model<any>;
    previousModel: Model<any> | undefined;
    source: ModelSelectSource;
}
/** Fired when user executes a bash command via ! or !! prefix */
export interface UserBashEvent {
    type: "user_bash";
    /** The command to execute */
    command: string;
    /** True if !! prefix was used (excluded from LLM context) */
    excludeFromContext: boolean;
    /** Current working directory */
    cwd: string;
}
/** Source of user input */
export type InputSource = "interactive" | "rpc" | "extension";
/** Fired when user input is received, before agent processing */
export interface InputEvent {
    type: "input";
    /** The input text */
    text: string;
    /** Attached images, if any */
    images?: ImageContent[];
    /** Where the input came from */
    source: InputSource;
}
/** Result from input event handler */
export type InputEventResult = {
    action: "continue";
} | {
    action: "transform";
    text: string;
    images?: ImageContent[];
} | {
    action: "handled";
};
interface ToolCallEventBase {
    type: "tool_call";
    toolCallId: string;
}
export interface BashToolCallEvent extends ToolCallEventBase {
    toolName: "bash";
    input: BashToolInput;
}
export interface ReadToolCallEvent extends ToolCallEventBase {
    toolName: "read";
    input: ReadToolInput;
}
export interface EditToolCallEvent extends ToolCallEventBase {
    toolName: "edit";
    input: EditToolInput;
}
export interface WriteToolCallEvent extends ToolCallEventBase {
    toolName: "write";
    input: WriteToolInput;
}
export interface GrepToolCallEvent extends ToolCallEventBase {
    toolName: "grep";
    input: GrepToolInput;
}
export interface FindToolCallEvent extends ToolCallEventBase {
    toolName: "find";
    input: FindToolInput;
}
export interface LsToolCallEvent extends ToolCallEventBase {
    toolName: "ls";
    input: LsToolInput;
}
export interface CustomToolCallEvent extends ToolCallEventBase {
    toolName: string;
    input: Record<string, unknown>;
}
/**
 * Fired before a tool executes. Can block.
 *
 * `event.input` is mutable. Mutate it in place to patch tool arguments before execution.
 * Later `tool_call` handlers see earlier mutations. No re-validation is performed after mutation.
 */
export type ToolCallEvent = BashToolCallEvent | ReadToolCallEvent | EditToolCallEvent | WriteToolCallEvent | GrepToolCallEvent | FindToolCallEvent | LsToolCallEvent | CustomToolCallEvent;
interface ToolResultEventBase {
    type: "tool_result";
    toolCallId: string;
    input: Record<string, unknown>;
    content: (TextContent | ImageContent)[];
    isError: boolean;
}
export interface BashToolResultEvent extends ToolResultEventBase {
    toolName: "bash";
    details: BashToolDetails | undefined;
}
export interface ReadToolResultEvent extends ToolResultEventBase {
    toolName: "read";
    details: ReadToolDetails | undefined;
}
export interface EditToolResultEvent extends ToolResultEventBase {
    toolName: "edit";
    details: EditToolDetails | undefined;
}
export interface WriteToolResultEvent extends ToolResultEventBase {
    toolName: "write";
    details: undefined;
}
export interface GrepToolResultEvent extends ToolResultEventBase {
    toolName: "grep";
    details: GrepToolDetails | undefined;
}
export interface FindToolResultEvent extends ToolResultEventBase {
    toolName: "find";
    details: FindToolDetails | undefined;
}
export interface LsToolResultEvent extends ToolResultEventBase {
    toolName: "ls";
    details: LsToolDetails | undefined;
}
export interface CustomToolResultEvent extends ToolResultEventBase {
    toolName: string;
    details: unknown;
}
/** Fired after a tool executes. Can modify result. */
export type ToolResultEvent = BashToolResultEvent | ReadToolResultEvent | EditToolResultEvent | WriteToolResultEvent | GrepToolResultEvent | FindToolResultEvent | LsToolResultEvent | CustomToolResultEvent;
export declare function isBashToolResult(e: ToolResultEvent): e is BashToolResultEvent;
export declare function isReadToolResult(e: ToolResultEvent): e is ReadToolResultEvent;
export declare function isEditToolResult(e: ToolResultEvent): e is EditToolResultEvent;
export declare function isWriteToolResult(e: ToolResultEvent): e is WriteToolResultEvent;
export declare function isGrepToolResult(e: ToolResultEvent): e is GrepToolResultEvent;
export declare function isFindToolResult(e: ToolResultEvent): e is FindToolResultEvent;
export declare function isLsToolResult(e: ToolResultEvent): e is LsToolResultEvent;
/**
 * Type guard for narrowing ToolCallEvent by tool name.
 *
 * Built-in tools narrow automatically (no type params needed):
 * ```ts
 * if (isToolCallEventType("bash", event)) {
 *   event.input.command;  // string
 * }
 * ```
 *
 * Custom tools require explicit type parameters:
 * ```ts
 * if (isToolCallEventType<"my_tool", MyToolInput>("my_tool", event)) {
 *   event.input.action;  // typed
 * }
 * ```
 *
 * Note: Direct narrowing via `event.toolName === "bash"` doesn't work because
 * CustomToolCallEvent.toolName is `string` which overlaps with all literals.
 */
export declare function isToolCallEventType(toolName: "bash", event: ToolCallEvent): event is BashToolCallEvent;
export declare function isToolCallEventType(toolName: "read", event: ToolCallEvent): event is ReadToolCallEvent;
export declare function isToolCallEventType(toolName: "edit", event: ToolCallEvent): event is EditToolCallEvent;
export declare function isToolCallEventType(toolName: "write", event: ToolCallEvent): event is WriteToolCallEvent;
export declare function isToolCallEventType(toolName: "grep", event: ToolCallEvent): event is GrepToolCallEvent;
export declare function isToolCallEventType(toolName: "find", event: ToolCallEvent): event is FindToolCallEvent;
export declare function isToolCallEventType(toolName: "ls", event: ToolCallEvent): event is LsToolCallEvent;
export declare function isToolCallEventType<TName extends string, TInput extends Record<string, unknown>>(toolName: TName, event: ToolCallEvent): event is ToolCallEvent & {
    toolName: TName;
    input: TInput;
};
/** Union of all event types */
export type ExtensionEvent = ResourcesDiscoverEvent | SessionEvent | ContextEvent | BeforeProviderRequestEvent | BeforeAgentStartEvent | AgentStartEvent | AgentEndEvent | TurnStartEvent | TurnEndEvent | MessageStartEvent | MessageUpdateEvent | MessageEndEvent | ToolExecutionStartEvent | ToolExecutionUpdateEvent | ToolExecutionEndEvent | ModelSelectEvent | UserBashEvent | InputEvent | ToolCallEvent | ToolResultEvent;
export interface ContextEventResult {
    messages?: AgentMessage[];
}
export type BeforeProviderRequestEventResult = unknown;
export interface ToolCallEventResult {
    /** Block tool execution. To modify arguments, mutate `event.input` in place instead. */
    block?: boolean;
    reason?: string;
}
/** Result from user_bash event handler */
export interface UserBashEventResult {
    /** Custom operations to use for execution */
    operations?: BashOperations;
    /** Full replacement: extension handled execution, use this result */
    result?: BashResult;
}
export interface ToolResultEventResult {
    content?: (TextContent | ImageContent)[];
    details?: unknown;
    isError?: boolean;
}
export interface BeforeAgentStartEventResult {
    message?: Pick<CustomMessage, "customType" | "content" | "display" | "details">;
    /** Replace the system prompt for this turn. If multiple extensions return this, they are chained. */
    systemPrompt?: string;
}
export interface SessionDirectoryResult {
    /** Custom session directory path. If multiple extensions return this, the last one wins. */
    sessionDir?: string;
}
/** Special startup-only handler. Unlike other events, this receives no ExtensionContext. */
export type SessionDirectoryHandler = (event: SessionDirectoryEvent) => Promise<SessionDirectoryResult | undefined> | SessionDirectoryResult | undefined;
export interface SessionBeforeSwitchResult {
    cancel?: boolean;
}
export interface SessionBeforeForkResult {
    cancel?: boolean;
    skipConversationRestore?: boolean;
}
export interface SessionBeforeCompactResult {
    cancel?: boolean;
    compaction?: CompactionResult;
}
export interface SessionBeforeTreeResult {
    cancel?: boolean;
    summary?: {
        summary: string;
        details?: unknown;
    };
    /** Override custom instructions for summarization */
    customInstructions?: string;
    /** Override whether customInstructions replaces the default prompt */
    replaceInstructions?: boolean;
    /** Override label to attach to the branch summary entry */
    label?: string;
}
export interface MessageRenderOptions {
    expanded: boolean;
}
export type MessageRenderer<T = unknown> = (message: CustomMessage<T>, options: MessageRenderOptions, theme: Theme) => Component | undefined;
export interface RegisteredCommand {
    name: string;
    sourceInfo: SourceInfo;
    description?: string;
    getArgumentCompletions?: (argumentPrefix: string) => AutocompleteItem[] | null;
    handler: (args: string, ctx: ExtensionCommandContext) => Promise<void>;
}
export interface ResolvedCommand extends RegisteredCommand {
    invocationName: string;
}
/** Handler function type for events */
export type ExtensionHandler<E, R = undefined> = (event: E, ctx: ExtensionContext) => Promise<R | void> | R | void;
/**
 * ExtensionAPI passed to extension factory functions.
 */
export interface ExtensionAPI {
    on(event: "resources_discover", handler: ExtensionHandler<ResourcesDiscoverEvent, ResourcesDiscoverResult>): void;
    on(event: "session_directory", handler: SessionDirectoryHandler): void;
    on(event: "session_start", handler: ExtensionHandler<SessionStartEvent>): void;
    on(event: "session_before_switch", handler: ExtensionHandler<SessionBeforeSwitchEvent, SessionBeforeSwitchResult>): void;
    on(event: "session_switch", handler: ExtensionHandler<SessionSwitchEvent>): void;
    on(event: "session_before_fork", handler: ExtensionHandler<SessionBeforeForkEvent, SessionBeforeForkResult>): void;
    on(event: "session_fork", handler: ExtensionHandler<SessionForkEvent>): void;
    on(event: "session_before_compact", handler: ExtensionHandler<SessionBeforeCompactEvent, SessionBeforeCompactResult>): void;
    on(event: "session_compact", handler: ExtensionHandler<SessionCompactEvent>): void;
    on(event: "session_shutdown", handler: ExtensionHandler<SessionShutdownEvent>): void;
    on(event: "session_before_tree", handler: ExtensionHandler<SessionBeforeTreeEvent, SessionBeforeTreeResult>): void;
    on(event: "session_tree", handler: ExtensionHandler<SessionTreeEvent>): void;
    on(event: "context", handler: ExtensionHandler<ContextEvent, ContextEventResult>): void;
    on(event: "before_provider_request", handler: ExtensionHandler<BeforeProviderRequestEvent, BeforeProviderRequestEventResult>): void;
    on(event: "before_agent_start", handler: ExtensionHandler<BeforeAgentStartEvent, BeforeAgentStartEventResult>): void;
    on(event: "agent_start", handler: ExtensionHandler<AgentStartEvent>): void;
    on(event: "agent_end", handler: ExtensionHandler<AgentEndEvent>): void;
    on(event: "turn_start", handler: ExtensionHandler<TurnStartEvent>): void;
    on(event: "turn_end", handler: ExtensionHandler<TurnEndEvent>): void;
    on(event: "message_start", handler: ExtensionHandler<MessageStartEvent>): void;
    on(event: "message_update", handler: ExtensionHandler<MessageUpdateEvent>): void;
    on(event: "message_end", handler: ExtensionHandler<MessageEndEvent>): void;
    on(event: "tool_execution_start", handler: ExtensionHandler<ToolExecutionStartEvent>): void;
    on(event: "tool_execution_update", handler: ExtensionHandler<ToolExecutionUpdateEvent>): void;
    on(event: "tool_execution_end", handler: ExtensionHandler<ToolExecutionEndEvent>): void;
    on(event: "model_select", handler: ExtensionHandler<ModelSelectEvent>): void;
    on(event: "tool_call", handler: ExtensionHandler<ToolCallEvent, ToolCallEventResult>): void;
    on(event: "tool_result", handler: ExtensionHandler<ToolResultEvent, ToolResultEventResult>): void;
    on(event: "user_bash", handler: ExtensionHandler<UserBashEvent, UserBashEventResult>): void;
    on(event: "input", handler: ExtensionHandler<InputEvent, InputEventResult>): void;
    /** Register a tool that the LLM can call. */
    registerTool<TParams extends TSchema = TSchema, TDetails = unknown, TState = any>(tool: ToolDefinition<TParams, TDetails, TState>): void;
    /** Register a custom command. */
    registerCommand(name: string, options: Omit<RegisteredCommand, "name" | "sourceInfo">): void;
    /** Register a keyboard shortcut. */
    registerShortcut(shortcut: KeyId, options: {
        description?: string;
        handler: (ctx: ExtensionContext) => Promise<void> | void;
    }): void;
    /** Register a CLI flag. */
    registerFlag(name: string, options: {
        description?: string;
        type: "boolean" | "string";
        default?: boolean | string;
    }): void;
    /** Get the value of a registered CLI flag. */
    getFlag(name: string): boolean | string | undefined;
    /** Register a custom renderer for CustomMessageEntry. */
    registerMessageRenderer<T = unknown>(customType: string, renderer: MessageRenderer<T>): void;
    /** Send a custom message to the session. */
    sendMessage<T = unknown>(message: Pick<CustomMessage<T>, "customType" | "content" | "display" | "details">, options?: {
        triggerTurn?: boolean;
        deliverAs?: "steer" | "followUp" | "nextTurn";
    }): void;
    /**
     * Send a user message to the agent. Always triggers a turn.
     * When the agent is streaming, use deliverAs to specify how to queue the message.
     */
    sendUserMessage(content: string | (TextContent | ImageContent)[], options?: {
        deliverAs?: "steer" | "followUp";
    }): void;
    /** Append a custom entry to the session for state persistence (not sent to LLM). */
    appendEntry<T = unknown>(customType: string, data?: T): void;
    /** Set the session display name (shown in session selector). */
    setSessionName(name: string): void;
    /** Get the current session name, if set. */
    getSessionName(): string | undefined;
    /** Set or clear a label on an entry. Labels are user-defined markers for bookmarking/navigation. */
    setLabel(entryId: string, label: string | undefined): void;
    /** Execute a shell command. */
    exec(command: string, args: string[], options?: ExecOptions): Promise<ExecResult>;
    /** Get the list of currently active tool names. */
    getActiveTools(): string[];
    /** Get all configured tools with parameter schema and source metadata. */
    getAllTools(): ToolInfo[];
    /** Set the active tools by name. */
    setActiveTools(toolNames: string[]): void;
    /** Get available slash commands in the current session. */
    getCommands(): SlashCommandInfo[];
    /** Set the current model. Returns false if no API key available. */
    setModel(model: Model<any>): Promise<boolean>;
    /** Get current thinking level. */
    getThinkingLevel(): ThinkingLevel;
    /** Set thinking level (clamped to model capabilities). */
    setThinkingLevel(level: ThinkingLevel): void;
    /**
     * Register or override a model provider.
     *
     * If `models` is provided: replaces all existing models for this provider.
     * If only `baseUrl` is provided: overrides the URL for existing models.
     * If `oauth` is provided: registers OAuth provider for /login support.
     * If `streamSimple` is provided: registers a custom API stream handler.
     *
     * During initial extension load this call is queued and applied once the
     * runner has bound its context. After that it takes effect immediately, so
     * it is safe to call from command handlers or event callbacks without
     * requiring a `/reload`.
     *
     * @example
     * // Register a new provider with custom models
     * pi.registerProvider("my-proxy", {
     *   baseUrl: "https://proxy.example.com",
     *   apiKey: "PROXY_API_KEY",
     *   api: "anthropic-messages",
     *   models: [
     *     {
     *       id: "claude-sonnet-4-20250514",
     *       name: "Claude 4 Sonnet (proxy)",
     *       reasoning: false,
     *       input: ["text", "image"],
     *       cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
     *       contextWindow: 200000,
     *       maxTokens: 16384
     *     }
     *   ]
     * });
     *
     * @example
     * // Override baseUrl for an existing provider
     * pi.registerProvider("anthropic", {
     *   baseUrl: "https://proxy.example.com"
     * });
     *
     * @example
     * // Register provider with OAuth support
     * pi.registerProvider("corporate-ai", {
     *   baseUrl: "https://ai.corp.com",
     *   api: "openai-responses",
     *   models: [...],
     *   oauth: {
     *     name: "Corporate AI (SSO)",
     *     async login(callbacks) { ... },
     *     async refreshToken(credentials) { ... },
     *     getApiKey(credentials) { return credentials.access; }
     *   }
     * });
     */
    registerProvider(name: string, config: ProviderConfig): void;
    /**
     * Unregister a previously registered provider.
     *
     * Removes all models belonging to the named provider and restores any
     * built-in models that were overridden by it. Has no effect if the provider
     * is not currently registered.
     *
     * Like `registerProvider`, this takes effect immediately when called after
     * the initial load phase.
     *
     * @example
     * pi.unregisterProvider("my-proxy");
     */
    unregisterProvider(name: string): void;
    /** Shared event bus for extension communication. */
    events: EventBus;
}
/** Configuration for registering a provider via pi.registerProvider(). */
export interface ProviderConfig {
    /** Base URL for the API endpoint. Required when defining models. */
    baseUrl?: string;
    /** API key or environment variable name. Required when defining models (unless oauth provided). */
    apiKey?: string;
    /** API type. Required at provider or model level when defining models. */
    api?: Api;
    /** Optional streamSimple handler for custom APIs. */
    streamSimple?: (model: Model<Api>, context: Context, options?: SimpleStreamOptions) => AssistantMessageEventStream;
    /** Custom headers to include in requests. */
    headers?: Record<string, string>;
    /** If true, adds Authorization: Bearer header with the resolved API key. */
    authHeader?: boolean;
    /** Models to register. If provided, replaces all existing models for this provider. */
    models?: ProviderModelConfig[];
    /** OAuth provider for /login support. The `id` is set automatically from the provider name. */
    oauth?: {
        /** Display name for the provider in login UI. */
        name: string;
        /** Run the login flow, return credentials to persist. */
        login(callbacks: OAuthLoginCallbacks): Promise<OAuthCredentials>;
        /** Refresh expired credentials, return updated credentials to persist. */
        refreshToken(credentials: OAuthCredentials): Promise<OAuthCredentials>;
        /** Convert credentials to API key string for the provider. */
        getApiKey(credentials: OAuthCredentials): string;
        /** Optional: modify models for this provider (e.g., update baseUrl based on credentials). */
        modifyModels?(models: Model<Api>[], credentials: OAuthCredentials): Model<Api>[];
    };
}
/** Configuration for a model within a provider. */
export interface ProviderModelConfig {
    /** Model ID (e.g., "claude-sonnet-4-20250514"). */
    id: string;
    /** Display name (e.g., "Claude 4 Sonnet"). */
    name: string;
    /** API type override for this model. */
    api?: Api;
    /** Whether the model supports extended thinking. */
    reasoning: boolean;
    /** Supported input types. */
    input: ("text" | "image")[];
    /** Cost per token (for tracking, can be 0). */
    cost: {
        input: number;
        output: number;
        cacheRead: number;
        cacheWrite: number;
    };
    /** Maximum context window size in tokens. */
    contextWindow: number;
    /** Maximum output tokens. */
    maxTokens: number;
    /** Custom headers for this model. */
    headers?: Record<string, string>;
    /** OpenAI compatibility settings. */
    compat?: Model<Api>["compat"];
}
/** Extension factory function type. Supports both sync and async initialization. */
export type ExtensionFactory = (pi: ExtensionAPI) => void | Promise<void>;
export interface RegisteredTool {
    definition: ToolDefinition;
    sourceInfo: SourceInfo;
}
export interface ExtensionFlag {
    name: string;
    description?: string;
    type: "boolean" | "string";
    default?: boolean | string;
    extensionPath: string;
}
export interface ExtensionShortcut {
    shortcut: KeyId;
    description?: string;
    handler: (ctx: ExtensionContext) => Promise<void> | void;
    extensionPath: string;
}
type HandlerFn = (...args: unknown[]) => Promise<unknown>;
export type SendMessageHandler = <T = unknown>(message: Pick<CustomMessage<T>, "customType" | "content" | "display" | "details">, options?: {
    triggerTurn?: boolean;
    deliverAs?: "steer" | "followUp" | "nextTurn";
}) => void;
export type SendUserMessageHandler = (content: string | (TextContent | ImageContent)[], options?: {
    deliverAs?: "steer" | "followUp";
}) => void;
export type AppendEntryHandler = <T = unknown>(customType: string, data?: T) => void;
export type SetSessionNameHandler = (name: string) => void;
export type GetSessionNameHandler = () => string | undefined;
export type GetActiveToolsHandler = () => string[];
/** Tool info with name, description, parameter schema, and source metadata */
export type ToolInfo = Pick<ToolDefinition, "name" | "description" | "parameters"> & {
    sourceInfo: SourceInfo;
};
export type GetAllToolsHandler = () => ToolInfo[];
export type GetCommandsHandler = () => SlashCommandInfo[];
export type SetActiveToolsHandler = (toolNames: string[]) => void;
export type RefreshToolsHandler = () => void;
export type SetModelHandler = (model: Model<any>) => Promise<boolean>;
export type GetThinkingLevelHandler = () => ThinkingLevel;
export type SetThinkingLevelHandler = (level: ThinkingLevel) => void;
export type SetLabelHandler = (entryId: string, label: string | undefined) => void;
/**
 * Shared state created by loader, used during registration and runtime.
 * Contains flag values (defaults set during registration, CLI values set after).
 */
export interface ExtensionRuntimeState {
    flagValues: Map<string, boolean | string>;
    /** Provider registrations queued during extension loading, processed when runner binds */
    pendingProviderRegistrations: Array<{
        name: string;
        config: ProviderConfig;
        extensionPath: string;
    }>;
    /**
     * Register or unregister a provider.
     *
     * Before bindCore(): queues registrations / removes from queue.
     * After bindCore(): calls ModelRegistry directly for immediate effect.
     */
    registerProvider: (name: string, config: ProviderConfig, extensionPath?: string) => void;
    unregisterProvider: (name: string, extensionPath?: string) => void;
}
/**
 * Action implementations for pi.* API methods.
 * Provided to runner.initialize(), copied into the shared runtime.
 */
export interface ExtensionActions {
    sendMessage: SendMessageHandler;
    sendUserMessage: SendUserMessageHandler;
    appendEntry: AppendEntryHandler;
    setSessionName: SetSessionNameHandler;
    getSessionName: GetSessionNameHandler;
    setLabel: SetLabelHandler;
    getActiveTools: GetActiveToolsHandler;
    getAllTools: GetAllToolsHandler;
    setActiveTools: SetActiveToolsHandler;
    refreshTools: RefreshToolsHandler;
    getCommands: GetCommandsHandler;
    setModel: SetModelHandler;
    getThinkingLevel: GetThinkingLevelHandler;
    setThinkingLevel: SetThinkingLevelHandler;
}
/**
 * Actions for ExtensionContext (ctx.* in event handlers).
 * Required by all modes.
 */
export interface ExtensionContextActions {
    getModel: () => Model<any> | undefined;
    isIdle: () => boolean;
    getSignal: () => AbortSignal | undefined;
    abort: () => void;
    hasPendingMessages: () => boolean;
    shutdown: () => void;
    getContextUsage: () => ContextUsage | undefined;
    compact: (options?: CompactOptions) => void;
    getSystemPrompt: () => string;
}
/**
 * Actions for ExtensionCommandContext (ctx.* in command handlers).
 * Only needed for interactive mode where extension commands are invokable.
 */
export interface ExtensionCommandContextActions {
    waitForIdle: () => Promise<void>;
    newSession: (options?: {
        parentSession?: string;
        setup?: (sessionManager: SessionManager) => Promise<void>;
    }) => Promise<{
        cancelled: boolean;
    }>;
    fork: (entryId: string) => Promise<{
        cancelled: boolean;
    }>;
    navigateTree: (targetId: string, options?: {
        summarize?: boolean;
        customInstructions?: string;
        replaceInstructions?: boolean;
        label?: string;
    }) => Promise<{
        cancelled: boolean;
    }>;
    switchSession: (sessionPath: string) => Promise<{
        cancelled: boolean;
    }>;
    reload: () => Promise<void>;
}
/**
 * Full runtime = state + actions.
 * Created by loader with throwing action stubs, completed by runner.initialize().
 */
export interface ExtensionRuntime extends ExtensionRuntimeState, ExtensionActions {
}
/** Loaded extension with all registered items. */
export interface Extension {
    path: string;
    resolvedPath: string;
    sourceInfo: SourceInfo;
    handlers: Map<string, HandlerFn[]>;
    tools: Map<string, RegisteredTool>;
    messageRenderers: Map<string, MessageRenderer>;
    commands: Map<string, RegisteredCommand>;
    flags: Map<string, ExtensionFlag>;
    shortcuts: Map<KeyId, ExtensionShortcut>;
}
/** Result of loading extensions. */
export interface LoadExtensionsResult {
    extensions: Extension[];
    errors: Array<{
        path: string;
        error: string;
    }>;
    /** Shared runtime - actions are throwing stubs until runner.initialize() */
    runtime: ExtensionRuntime;
}
export interface ExtensionError {
    extensionPath: string;
    event: string;
    error: string;
    stack?: string;
}
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