import path from "path";
import { resolveContentPath } from "./contentTransforms.js";

export function sanitizeWorldId(worldId) {
  const raw = String(worldId || "").trim();
  if (!raw) {
    return "world";
  }
  return raw.replace(/[^a-zA-Z0-9_-]/g, "_");
}

export function defaultWorldDirRel(worldId) {
  return `worlds/${sanitizeWorldId(worldId)}`;
}

export function buildWorldChunkFileName(chunkX, chunkY) {
  return `${Math.floor(Number(chunkX) || 0)}_${Math.floor(Number(chunkY) || 0)}.json`;
}

export function getWorldStoragePaths(contentRoot, worldEntryOrId) {
  const worldId = typeof worldEntryOrId === "string"
    ? String(worldEntryOrId || "").trim()
    : String(worldEntryOrId?.id || "").trim();
  const worldDirRel = typeof worldEntryOrId === "string"
    ? defaultWorldDirRel(worldId)
    : String(worldEntryOrId?.worldDir || defaultWorldDirRel(worldId));
  const worldDirAbs = resolveContentPath(contentRoot, worldDirRel);
  const chunksDirRel = `${worldDirRel}/chunks`;
  return {
    worldId,
    worldDirRel,
    worldDirAbs,
    worldJsonRel: `${worldDirRel}/world.json`,
    worldJsonAbs: path.join(worldDirAbs, "world.json"),
    bookmarksRel: `${worldDirRel}/bookmarks.json`,
    bookmarksAbs: path.join(worldDirAbs, "bookmarks.json"),
    chunksDirRel,
    chunksDirAbs: path.join(worldDirAbs, "chunks"),
  };
}

export function normalizeWorldIndexEntry(entry) {
  const id = sanitizeWorldId(entry?.id || "");
  return {
    id,
    name: String(entry?.name || id || "World"),
    worldDir: String(entry?.worldDir || defaultWorldDirRel(id)),
  };
}

export function normalizeWorldIndexPayload(payload) {
  const worlds = Array.isArray(payload?.worlds)
    ? payload.worlds
      .filter((entry) => entry && typeof entry === "object" && !Array.isArray(entry))
      .map((entry) => normalizeWorldIndexEntry(entry))
    : [];
  return {
    schemaVersion: typeof payload?.schemaVersion === "number" ? payload.schemaVersion : 1,
    worlds,
  };
}

export function normalizeWorldBookmark(entry, index = 0) {
  const fallbackId = `bookmark_${index + 1}`;
  return {
    id: String(entry?.id || fallbackId).trim() || fallbackId,
    label: String(entry?.label || entry?.id || fallbackId).trim() || fallbackId,
    x: Math.floor(Number(entry?.x) || 0),
    y: Math.floor(Number(entry?.y) || 0),
  };
}