import type { AgentMessage } from "@earendil-works/pi-agent-core";
import { type ImageContent, type Message, type TextContent, type Usage } from "@earendil-works/pi-ai";
import { type BashExecutionMessage, type CustomMessage } from "./messages.ts";
export declare const CURRENT_SESSION_VERSION = 3;
export interface SessionHeader {
    type: "session";
    version?: number;
    id: string;
    timestamp: string;
    cwd: string;
    parentSession?: string;
}
export interface NewSessionOptions {
    id?: string;
    parentSession?: string;
}
export interface SessionEntryBase {
    type: string;
    id: string;
    parentId: string | null;
    timestamp: string;
}
export interface SessionMessageEntry extends SessionEntryBase {
    type: "message";
    message: AgentMessage;
}
export interface ThinkingLevelChangeEntry extends SessionEntryBase {
    type: "thinking_level_change";
    thinkingLevel: string;
}
export interface ModelChangeEntry extends SessionEntryBase {
    type: "model_change";
    provider: string;
    modelId: string;
}
export interface CompactionEntry<T = unknown> extends SessionEntryBase {
    type: "compaction";
    summary: string;
    firstKeptEntryId: string;
    tokensBefore: number;
    /** Extension-specific data (e.g., ArtifactIndex, version markers for structured compaction) */
    details?: T;
    /** Usage from the LLM call(s) that generated this summary, if available */
    usage?: Usage;
    /** True if generated by an extension, undefined/false if pi-generated (backward compatible) */
    fromHook?: boolean;
}
export interface BranchSummaryEntry<T = unknown> extends SessionEntryBase {
    type: "branch_summary";
    fromId: string;
    summary: string;
    /** Extension-specific data (not sent to LLM) */
    details?: T;
    /** Usage from the LLM call that generated this summary, if available */
    usage?: Usage;
    /** True if generated by an extension, false if pi-generated */
    fromHook?: boolean;
}
/**
 * Custom entry for extensions to store extension-specific data in the session.
 * Use customType to identify your extension's entries.
 *
 * Purpose: Persist extension state across session reloads. On reload, extensions can
 * scan entries for their customType and reconstruct internal state.
 *
 * Does NOT participate in LLM context (ignored by buildSessionContext).
 * For injecting content into context, see CustomMessageEntry.
 */
export interface CustomEntry<T = unknown> extends SessionEntryBase {
    type: "custom";
    customType: string;
    data?: T;
}
/** Label entry for user-defined bookmarks/markers on entries. */
export interface LabelEntry extends SessionEntryBase {
    type: "label";
    targetId: string;
    label: string | undefined;
}
/** Session metadata entry (e.g., user-defined display name). */
export interface SessionInfoEntry extends SessionEntryBase {
    type: "session_info";
    name?: string;
}
/**
 * Custom message entry for extensions to inject messages into LLM context.
 * Use customType to identify your extension's entries.
 *
 * Unlike CustomEntry, this DOES participate in LLM context.
 * The content is converted to a user message in buildSessionContext().
 * Use details for extension-specific metadata (not sent to LLM).
 *
 * display controls TUI rendering:
 * - false: hidden entirely
 * - true: rendered with distinct styling (different from user messages)
 */
export interface CustomMessageEntry<T = unknown> extends SessionEntryBase {
    type: "custom_message";
    customType: string;
    content: string | (TextContent | ImageContent)[];
    details?: T;
    display: boolean;
}
/** Session entry - has id/parentId for tree structure (returned by "read" methods in SessionManager) */
export type SessionEntry = SessionMessageEntry | ThinkingLevelChangeEntry | ModelChangeEntry | CompactionEntry | BranchSummaryEntry | CustomEntry | CustomMessageEntry | LabelEntry | SessionInfoEntry;
/** Raw file entry (includes header) */
export type FileEntry = SessionHeader | SessionEntry;
/** Tree node for getTree() - defensive copy of session structure */
export interface SessionTreeNode {
    entry: SessionEntry;
    children: SessionTreeNode[];
    /** Resolved label for this entry, if any */
    label?: string;
    /** Timestamp of the latest label change for this entry, if any */
    labelTimestamp?: string;
}
export interface SessionContext {
    messages: AgentMessage[];
    thinkingLevel: string;
    model: {
        provider: string;
        modelId: string;
    } | null;
}
export interface SessionInfo {
    path: string;
    id: string;
    /** Working directory where the session was started. Empty string for old sessions. */
    cwd: string;
    /** User-defined display name from session_info entries. */
    name?: string;
    /** Path to the parent session (if this session was forked). */
    parentSessionPath?: string;
    created: Date;
    modified: Date;
    messageCount: number;
    firstMessage: string;
    allMessagesText: string;
}
export type ReadonlySessionManager = Pick<SessionManager, "getCwd" | "getSessionDir" | "getSessionId" | "getSessionFile" | "getLeafId" | "getLeafEntry" | "getEntry" | "getLabel" | "getBranch" | "buildContextEntries" | "getHeader" | "getEntries" | "getTree" | "getSessionName">;
export declare function assertValidSessionId(id: string): void;
/** Exported for testing */
export declare function migrateSessionEntries(entries: FileEntry[]): void;
/** Exported for compaction.test.ts */
export declare function parseSessionEntries(content: string): FileEntry[];
export declare function getLatestCompactionEntry(entries: SessionEntry[]): CompactionEntry | null;
/**
 * Project one selected session entry into LLM/runtime messages.
 * Plain custom entries are display/state entries and do not participate in context.
 */
export declare function sessionEntryToContextMessages(entry: SessionEntry): AgentMessage[];
/**
 * Build the active, compaction-aware session entry list.
 *
 * This follows the current leaf path. If the path contains compaction entries,
 * the latest compaction is represented by the compaction entry itself, followed
 * by the kept entries starting at firstKeptEntryId and all entries after the
 * compaction entry. Older summarized entries are omitted.
 */
export declare function buildContextEntries(entries: SessionEntry[], leafId?: string | null, byId?: Map<string, SessionEntry>): SessionEntry[];
/**
 * Build the session context from entries using tree traversal.
 * If leafId is provided, walks from that entry to root.
 * Handles compaction and branch summaries along the path.
 */
export declare function buildSessionContext(entries: SessionEntry[], leafId?: string | null, byId?: Map<string, SessionEntry>): SessionContext;
export declare function getDefaultSessionDir(cwd: string, agentDir?: string): string;
/** Exported for testing */
export declare function loadEntriesFromFile(filePath: string): FileEntry[];
/** Exported for testing */
export declare function findMostRecentSession(sessionDir: string, cwd?: string): string | null;
export type SessionListProgress = (loaded: number, total: number) => void;
/**
 * Manages conversation sessions as append-only trees stored in JSONL files.
 *
 * Each session entry has an id and parentId forming a tree structure. The "leaf"
 * pointer tracks the current position. Appending creates a child of the current leaf.
 * Branching moves the leaf to an earlier entry, allowing new branches without
 * modifying history.
 *
 * Use buildSessionContext() to get the resolved message list for the LLM, which
 * handles compaction summaries and follows the path from root to current leaf.
 */
export declare class SessionManager {
    private sessionId;
    private sessionFile;
    private sessionDir;
    private cwd;
    private persist;
    private flushed;
    private fileEntries;
    private byId;
    private labelsById;
    private labelTimestampsById;
    private leafId;
    private constructor();
    /** Switch to a different session file (used for resume and branching) */
    setSessionFile(sessionFile: string): void;
    private _setSessionFile;
    newSession(options?: NewSessionOptions): string | undefined;
    private _buildIndex;
    private _rewriteFile;
    isPersisted(): boolean;
    getCwd(): string;
    getSessionDir(): string;
    usesDefaultSessionDir(): boolean;
    getSessionId(): string;
    getSessionFile(): string | undefined;
    _persist(entry: SessionEntry): void;
    private _appendEntry;
    /** Append a message as child of current leaf, then advance leaf. Returns entry id.
     * Does not allow writing CompactionSummaryMessage and BranchSummaryMessage directly.
     * Reason: we want these to be top-level entries in the session, not message session entries,
     * so it is easier to find them.
     * These need to be appended via appendCompaction() and appendBranchSummary() methods.
     */
    appendMessage(message: Message | CustomMessage | BashExecutionMessage): string;
    /** Append a thinking level change as child of current leaf, then advance leaf. Returns entry id. */
    appendThinkingLevelChange(thinkingLevel: string): string;
    /** Append a model change as child of current leaf, then advance leaf. Returns entry id. */
    appendModelChange(provider: string, modelId: string): string;
    /** Append a compaction summary as child of current leaf, then advance leaf. Returns entry id. */
    appendCompaction<T = unknown>(summary: string, firstKeptEntryId: string, tokensBefore: number, details?: T, fromHook?: boolean, usage?: Usage): string;
    /** Append a custom entry (for extensions) as child of current leaf, then advance leaf. Returns entry id. */
    appendCustomEntry(customType: string, data?: unknown): string;
    /** Append a session info entry (e.g., display name). Returns entry id. */
    appendSessionInfo(name: string): string;
    /** Get the current session name from the latest session_info entry, if any. */
    getSessionName(): string | undefined;
    /**
     * Append a custom message entry (for extensions) that participates in LLM context.
     * @param customType Extension identifier for filtering on reload
     * @param content Message content (string or TextContent/ImageContent array)
     * @param display Whether to show in TUI (true = styled display, false = hidden)
     * @param details Optional extension-specific metadata (not sent to LLM)
     * @returns Entry id
     */
    appendCustomMessageEntry<T = unknown>(customType: string, content: string | (TextContent | ImageContent)[], display: boolean, details?: T): string;
    getLeafId(): string | null;
    getLeafEntry(): SessionEntry | undefined;
    getEntry(id: string): SessionEntry | undefined;
    /**
     * Get all direct children of an entry.
     */
    getChildren(parentId: string): SessionEntry[];
    /**
     * Get the label for an entry, if any.
     */
    getLabel(id: string): string | undefined;
    /**
     * Set or clear a label on an entry.
     * Labels are user-defined markers for bookmarking/navigation.
     * Pass undefined or empty string to clear the label.
     */
    appendLabelChange(targetId: string, label: string | undefined): string;
    /**
     * Walk from entry to root, returning all entries in path order.
     * Includes all entry types (messages, compaction, model changes, etc.).
     * Use buildSessionContext() to get the resolved messages for the LLM.
     */
    getBranch(fromId?: string): SessionEntry[];
    /**
     * Build the active, compaction-aware entry list for context/rendering.
     * Uses tree traversal from current leaf.
     */
    buildContextEntries(): SessionEntry[];
    /**
     * Build the session context (what gets sent to the LLM).
     * Uses tree traversal from current leaf.
     */
    buildSessionContext(): SessionContext;
    /**
     * Get session header.
     */
    getHeader(): SessionHeader | null;
    /**
     * Get all session entries (excludes header). Returns a shallow copy.
     * The session is append-only: use appendXXX() to add entries, branch() to
     * change the leaf pointer. Entries cannot be modified or deleted.
     */
    getEntries(): SessionEntry[];
    /**
     * Get the session as a tree structure. Returns a shallow defensive copy of all entries.
     * A well-formed session has exactly one root (first entry with parentId === null).
     * Orphaned entries (broken parent chain) are also returned as roots.
     */
    getTree(): SessionTreeNode[];
    /**
     * Start a new branch from an earlier entry.
     * Moves the leaf pointer to the specified entry. The next appendXXX() call
     * will create a child of that entry, forming a new branch. Existing entries
     * are not modified or deleted.
     */
    branch(branchFromId: string): void;
    /**
     * Reset the leaf pointer to null (before any entries).
     * The next appendXXX() call will create a new root entry (parentId = null).
     * Use this when navigating to re-edit the first user message.
     */
    resetLeaf(): void;
    /**
     * Start a new branch with a summary of the abandoned path.
     * Same as branch(), but also appends a branch_summary entry that captures
     * context from the abandoned conversation path.
     */
    branchWithSummary(branchFromId: string | null, summary: string, details?: unknown, fromHook?: boolean, usage?: Usage): string;
    /**
     * Create a new session file containing only the path from root to the specified leaf.
     * Useful for extracting a single conversation path from a branched session.
     * Returns the new session file path, or undefined if not persisting.
     */
    createBranchedSession(leafId: string): string | undefined;
    /**
     * Create a new session.
     * @param cwd Working directory (stored in session header)
     * @param sessionDir Optional session directory. If omitted, uses default (~/.pi/agent/sessions/<encoded-cwd>/).
     */
    static create(cwd: string, sessionDir?: string, options?: NewSessionOptions): SessionManager;
    /**
     * Open a specific session file.
     * @param path Path to session file
     * @param sessionDir Optional session directory for /new or /branch. If omitted, derives from file's parent.
     * @param cwdOverride Optional cwd override instead of the session header cwd.
     */
    static open(path: string, sessionDir?: string, cwdOverride?: string): SessionManager;
    /**
     * Continue the most recent session, or create new if none.
     * @param cwd Working directory
     * @param sessionDir Optional session directory. If omitted, uses default (~/.pi/agent/sessions/<encoded-cwd>/).
     */
    static continueRecent(cwd: string, sessionDir?: string): SessionManager;
    /** Create an in-memory session (no file persistence) */
    static inMemory(cwd?: string, options?: NewSessionOptions): SessionManager;
    /**
     * Fork a session from another project directory into the current project.
     * Creates a new session in the target cwd with the full history from the source session.
     * @param sourcePath Path to the source session file
     * @param targetCwd Target working directory (where the new session will be stored)
     * @param sessionDir Optional session directory. If omitted, uses default for targetCwd.
     */
    static forkFrom(sourcePath: string, targetCwd: string, sessionDir?: string, options?: NewSessionOptions): SessionManager;
    /**
     * List all sessions for a directory.
     * @param cwd Working directory (used to compute default session directory)
     * @param sessionDir Optional session directory. If omitted, uses default (~/.pi/agent/sessions/<encoded-cwd>/).
     * @param onProgress Optional callback for progress updates (loaded, total)
     */
    static list(cwd: string, sessionDir?: string, onProgress?: SessionListProgress): Promise<SessionInfo[]>;
    /**
     * List all sessions across all project directories.
     * @param onProgress Optional callback for progress updates (loaded, total)
     */
    static listAll(onProgress?: SessionListProgress): Promise<SessionInfo[]>;
    static listAll(sessionDir?: string, onProgress?: SessionListProgress): Promise<SessionInfo[]>;
}
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