export const SESSION_BROWSER_SCOPE = "current_project" as const;

export const SESSION_BROWSER_SORT_MODES = [
	"threaded",
	"recent",
	"relevance",
] as const;
export type SessionBrowserSortMode =
	(typeof SESSION_BROWSER_SORT_MODES)[number];

export const SESSION_BROWSER_NAME_FILTERS = ["all", "named"] as const;
export type SessionBrowserNameFilter =
	(typeof SESSION_BROWSER_NAME_FILTERS)[number];

export const SESSION_MANAGE_ACTIONS = ["rename"] as const;
export type SessionManageAction = (typeof SESSION_MANAGE_ACTIONS)[number];

export interface SessionBrowserQuery {
	query?: string;
	sortMode?: SessionBrowserSortMode;
	nameFilter?: SessionBrowserNameFilter;
}

export interface ResolvedSessionBrowserQuery {
	query: string;
	sortMode: SessionBrowserSortMode;
	nameFilter: SessionBrowserNameFilter;
}

export interface SessionBrowserProjectScope {
	scope: typeof SESSION_BROWSER_SCOPE;
	cwd: string;
	sessionsDir: string;
	activeSessionPath: string | null;
}

export interface SessionBrowserSession {
	id: string;
	path: string;
	cwd: string;
	name?: string;
	createdAt: string;
	modifiedAt: string;
	messageCount: number;
	parentSessionPath?: string;
	firstMessage: string;
	isActive: boolean;
	depth: number;
	isLastInThread: boolean;
	ancestorHasNextSibling: boolean[];
}

export interface SessionBrowserResponse {
	project: SessionBrowserProjectScope;
	query: ResolvedSessionBrowserQuery;
	totalSessions: number;
	returnedSessions: number;
	sessions: SessionBrowserSession[];
}

export interface RenameSessionRequest {
	action: "rename";
	sessionPath: string;
	name: string;
}

export type SessionManageRequest = RenameSessionRequest;
export type SessionManageErrorCode =
	| "invalid_request"
	| "not_found"
	| "rename_failed"
	| "onboarding_locked";

export interface SessionManageSuccessResponse {
	success: true;
	action: "rename";
	scope: typeof SESSION_BROWSER_SCOPE;
	sessionPath: string;
	name: string;
	isActiveSession: boolean;
	mutation: "rpc" | "session_file";
}

export interface SessionManageErrorResponse {
	success: false;
	action: "rename";
	scope: typeof SESSION_BROWSER_SCOPE;
	sessionPath?: string;
	name?: string;
	isActiveSession?: boolean;
	mutation?: "rpc" | "session_file";
	code: SessionManageErrorCode;
	error: string;
}

export type SessionManageResponse =
	| SessionManageSuccessResponse
	| SessionManageErrorResponse;

export function isSessionBrowserSortMode(
	value: string | null | undefined,
): value is SessionBrowserSortMode {
	return SESSION_BROWSER_SORT_MODES.includes(
		(value ?? "") as SessionBrowserSortMode,
	);
}

export function isSessionBrowserNameFilter(
	value: string | null | undefined,
): value is SessionBrowserNameFilter {
	return SESSION_BROWSER_NAME_FILTERS.includes(
		(value ?? "") as SessionBrowserNameFilter,
	);
}

export function isSessionManageAction(
	value: string | null | undefined,
): value is SessionManageAction {
	return SESSION_MANAGE_ACTIONS.includes((value ?? "") as SessionManageAction);
}

export function normalizeSessionBrowserQuery(
	query?: SessionBrowserQuery,
): ResolvedSessionBrowserQuery {
	return {
		query: query?.query?.trim() ?? "",
		sortMode: query?.sortMode ?? "threaded",
		nameFilter: query?.nameFilter ?? "all",
	};
}