import fs from "fs/promises";
import path from "path";
import { homedir } from "os";

const WORKSPACE_PATH = process.env.WORKSPACE_PATH || path.join(homedir(), "Layonara Forge");

interface ForgeConfig {
  githubPat?: string;
  workspacePath: string;
  nwnHomePath: string;
  setupComplete: boolean;
  editorState?: {
    openTabs: string[];
    activeTab?: string;
    cursorPositions: Record<string, { line: number; column: number }>;
  };
}

const REQUIRED_DIRS = [
  "repos",
  "server/modules",
  "server/hak",
  "server/tlk",
  "server/servervault",
  "server/database",
  "server/development",
  "server/override",
  "server/portraits",
  "logs",
  "config",
];

export async function ensureWorkspaceStructure(): Promise<void> {
  for (const dir of REQUIRED_DIRS) {
    await fs.mkdir(path.join(WORKSPACE_PATH, dir), { recursive: true });
  }
}

export async function readConfig(): Promise<ForgeConfig> {
  const configPath = path.join(WORKSPACE_PATH, "config", "forge.json");
  try {
    const raw = await fs.readFile(configPath, "utf-8");
    return JSON.parse(raw);
  } catch {
    return {
      workspacePath: WORKSPACE_PATH,
      nwnHomePath: process.env.NWN_HOME_PATH || "",
      setupComplete: false,
    };
  }
}

export async function writeConfig(config: ForgeConfig): Promise<void> {
  const configPath = path.join(WORKSPACE_PATH, "config", "forge.json");
  await fs.mkdir(path.dirname(configPath), { recursive: true });
  await fs.writeFile(configPath, JSON.stringify(config, null, 2));
}

export function getWorkspacePath(): string {
  return WORKSPACE_PATH;
}

export function getServerPath(...segments: string[]): string {
  return path.join(WORKSPACE_PATH, "server", ...segments);
}

export function getRepoPath(repo: string, ...segments: string[]): string {
  return path.join(WORKSPACE_PATH, "repos", repo, ...segments);
}