import * as fs from "node:fs/promises";
import * as path from "node:path";
import { resolvePath } from "wow-core";

export interface ContextFileEntry {
  rel: string;
  content: string;
}

export function resolveContextPath(input: string, cwd: string): string {
  return resolvePath(input, cwd);
}

export async function scanDir(
  dir: string,
  out: ContextFileEntry[],
): Promise<void> {
  try {
    const entries = await fs.readdir(dir, { withFileTypes: true });
    for (const entry of entries.sort((a, b) => a.name.localeCompare(b.name))) {
      if (!entry.isFile() || !entry.name.endsWith(".md")) continue;
      const filePath = path.join(dir, entry.name);
      const content = await fs.readFile(filePath, "utf-8");
      out.push({ rel: filePath, content: content.trim() });
    }
  } catch {
    // Missing/unreadable context directories are ignored.
  }
}

export async function tryRead(
  absPath: string,
  relHint: string,
  out: ContextFileEntry[],
): Promise<void> {
  try {
    const stat = await fs.stat(absPath);
    if (!stat.isFile()) return;
    const content = await fs.readFile(absPath, "utf-8");
    out.push({ rel: relHint, content: content.trim() });
  } catch {
    // Missing/unreadable context files are ignored.
  }
}