import { existsSync } from 'fs';
import { dirname, join, parse } from 'path';

export type EntityType = 'tasks' | 'handoffs' | 'decisions' | 'memory' | 'messages' | 'status';

export function getAgentHubDir(cwd: string = process.cwd()): string {
  return join(cwd, '.agenthub');
}

/**
 * Walk up from `startCwd` to find the nearest directory that contains an
 * initialized AgentHub project (`.agenthub/agenthub.config.json`).
 * Returns the project root, or `undefined` if none is found.
 * This makes the CLI usable from any subdirectory of the project.
 */
export function findProjectRoot(startCwd: string = process.cwd()): string | undefined {
  let dir = startCwd;
  const { root } = parse(dir);
  while (true) {
    if (existsSync(join(dir, '.agenthub', 'agenthub.config.json'))) return dir;
    if (dir === root) return undefined;
    dir = dirname(dir);
  }
}

export function getEntityDir(cwd: string, type: EntityType): string {
  return join(getAgentHubDir(cwd), type);
}

export function getCounterPath(cwd: string): string {
  return join(getAgentHubDir(cwd), '.counter.json');
}

export function getConfigPath(cwd: string): string {
  return join(getAgentHubDir(cwd), 'agenthub.config.json');
}

export function getIndexPath(cwd: string): string {
  return join(getAgentHubDir(cwd), '.index.sqlite');
}

export function getStatusPath(cwd: string): string {
  return join(getEntityDir(cwd, 'status'), 'latest.md');
}