import { existsSync, mkdirSync } from "node:fs";
import { homedir } from "node:os";
import { join } from "node:path";
import type { SessionPaths } from "./types.ts";
import { MAX_FILE_SIZE } from "./config.ts";

export const DEFAULT_CHRONO_DIR = join(homedir(), ".pi", "chrono");
export let CHRONO_DIR = DEFAULT_CHRONO_DIR;
export let SESSIONS_DIR = join(CHRONO_DIR, "sessions");
export let BLOBS_DIR = join(CHRONO_DIR, "blobs");
export { MAX_FILE_SIZE };

export function setChronoStorageRoot(root: string): void {
	CHRONO_DIR = root;
	SESSIONS_DIR = join(CHRONO_DIR, "sessions");
	BLOBS_DIR = join(CHRONO_DIR, "blobs");
}

export function ensureDirs(): void {
	for (const d of [CHRONO_DIR, SESSIONS_DIR, BLOBS_DIR]) {
		if (!existsSync(d)) mkdirSync(d, { recursive: true });
	}
}

export function sessionPaths(sessionId: string): SessionPaths {
	const dir = join(SESSIONS_DIR, sessionId);
	return {
		sessionId,
		dir,
		stateFile: join(dir, "state.json"),
		pendingFile: join(dir, "pending-pre.json"),
		journalsDir: join(dir, "journals"),
	};
}

export function ensureSessionDirs(p: SessionPaths): void {
	for (const d of [p.dir, p.journalsDir]) {
		if (!existsSync(d)) mkdirSync(d, { recursive: true });
	}
}