import { expect, test, describe, beforeEach, afterEach } from "vitest";
import { existsSync, mkdirSync, rmSync, writeFileSync } from "node:fs";
import { homedir, tmpdir } from "node:os";
import path from "node:path";

import {
  getConfigDir,
  getMnemonicsDir,
  getDataDir,
  getWalletConfigPath,
  resolveMnemonicFilePath,
} from "../../src/utils/paths";

describe("paths utilities", () => {
  describe("getConfigDir", () => {
    test("returns path under ~/.config/xo-cli", () => {
      const configDir = getConfigDir();

      expect(configDir).toBe(path.join(homedir(), ".config", "xo-cli"));
    });

    test("creates the directory if it does not exist", () => {
      const configDir = getConfigDir();

      expect(existsSync(configDir)).toBe(true);
    });
  });

  describe("getMnemonicsDir", () => {
    test("returns path under config dir", () => {
      const mnemonicsDir = getMnemonicsDir();

      expect(mnemonicsDir).toBe(path.join(homedir(), ".config", "xo-cli", "mnemonics"));
    });

    test("creates the directory if it does not exist", () => {
      const mnemonicsDir = getMnemonicsDir();

      expect(existsSync(mnemonicsDir)).toBe(true);
    });
  });

  describe("getDataDir", () => {
    test("returns path under config dir", () => {
      const dataDir = getDataDir();

      expect(dataDir).toBe(path.join(homedir(), ".config", "xo-cli", "data"));
    });

    test("creates the directory if it does not exist", () => {
      const dataDir = getDataDir();

      expect(existsSync(dataDir)).toBe(true);
    });
  });

  describe("getWalletConfigPath", () => {
    test("returns .wallet file path under config dir", () => {
      const walletConfigPath = getWalletConfigPath();

      expect(walletConfigPath).toBe(path.join(homedir(), ".config", "xo-cli", ".wallet"));
    });
  });

  describe("resolveMnemonicFilePath (global)", () => {
    let tempDir: string;

    beforeEach(() => {
      tempDir = path.join(tmpdir(), `xo-cli-paths-test-${Date.now()}`);
      mkdirSync(tempDir, { recursive: true });
    });

    afterEach(() => {
      rmSync(tempDir, { recursive: true, force: true });
    });

    test("resolves absolute path when file exists", () => {
      const filePath = path.join(tempDir, "mnemonic-test");
      writeFileSync(filePath, "test");

      const resolved = resolveMnemonicFilePath(filePath);
      expect(resolved).toBe(filePath);
    });

    test("resolves path relative to cwd when file exists", () => {
      const originalCwd = process.cwd();
      process.chdir(tempDir);

      try {
        writeFileSync(path.join(tempDir, "mnemonic-cwd-test"), "test");
        const resolved = resolveMnemonicFilePath("mnemonic-cwd-test");
        expect(resolved).toBe(path.join(tempDir, "mnemonic-cwd-test"));
      } finally {
        process.chdir(originalCwd);
      }
    });

    test("resolves from global mnemonics dir when file exists there", () => {
      const mnemonicsDir = getMnemonicsDir();
      const testFile = path.join(mnemonicsDir, "mnemonic-global-test");

      try {
        writeFileSync(testFile, "test");
        const resolved = resolveMnemonicFilePath("mnemonic-global-test");
        expect(resolved).toBe(testFile);
      } finally {
        if (existsSync(testFile)) {
          rmSync(testFile);
        }
      }
    });

    test("throws when file not found anywhere", () => {
      expect(() => resolveMnemonicFilePath("nonexistent-mnemonic-file-xyz")).toThrow(
        /Mnemonic file not found/,
      );
    });

    test("does not resolve absolute path if file does not exist", () => {
      const nonExistentPath = "/nonexistent/path/mnemonic-test";
      expect(() => resolveMnemonicFilePath(nonExistentPath)).toThrow(
        /Mnemonic file not found/,
      );
    });
  });

  describe("path hierarchy", () => {
    test("mnemonics dir is under config dir", () => {
      const configDir = getConfigDir();
      const mnemonicsDir = getMnemonicsDir();

      expect(mnemonicsDir.startsWith(configDir)).toBe(true);
    });

    test("data dir is under config dir", () => {
      const configDir = getConfigDir();
      const dataDir = getDataDir();

      expect(dataDir.startsWith(configDir)).toBe(true);
    });

    test("wallet config is under config dir", () => {
      const configDir = getConfigDir();
      const walletConfig = getWalletConfigPath();

      expect(walletConfig.startsWith(configDir)).toBe(true);
    });
  });
});