using NUnit.Framework;
using System.Collections;
using System.IO;
using System.Linq;
using TMPro;
using UnityEditor;
using UnityEngine;
using UnityEngine.TestTools;
using UnityEngine.UI;

/// <summary>
/// Test the UserCreationScreen class
/// </summary>
[TestFixture]
public class UserCreationScreenTests
{
    /// <summary>
    /// Wait time between scene transitions
    /// </summary>
    private const float WAIT_TIME = 0.2f;

    /// <summary>
    /// Setup the UserCreationScreen tests
    /// </summary>
    private IEnumerator Setup_UserCreationScreen(string startScreen = "Accounts/Scenes/UserCreationScreen")
    {
        string path = $"{Application.persistentDataPath}/wesign_unit_test.json";
        string oneUser = "{\"version\":1027,\"users\":[{\"entries\":[],\"username\":\"Tester0\",\"avatarIndex\":0,\"playtime\":0.0,\"minigames\":[],\"courses\":[]}],\"currentUser\":0,\"currentMinigame\":0,\"currentCourse\":0,\"currentTheme\":0}";

        File.WriteAllText(path, oneUser);
        PersistentDataController.PATH = path;
        PersistentDataController.GetInstance().Load();
        AssetDatabase.LoadAssetAtPath<UserAvatarList>("Assets/Accounts/ScriptableObjects/UserAvatarList.asset").Awake();

        SystemController.GetInstance().SwapScene(startScreen);
        yield return new WaitForSeconds(WAIT_TIME);
    }

    /// <summary>
    /// Cleanup after testing
    /// </summary>
    [TearDown]
    public void TearDown_UserCreationScreen()
    {
        PersistentDataController.PATH = null;
    }

    /// <summary>
    /// Test whether every item that needs to be assign in the editor, is assigned
    /// </summary>
    [UnityTest]
    public IEnumerator Test_EditorAssignments()
    {
        yield return Setup_UserCreationScreen();

        var userCreationController = GameObject.FindObjectOfType<UserCreationScreen>();
        Assert.IsNotNull(userCreationController);
        Assert.IsNotNull(userCreationController.errorMessage);
        Assert.IsNotNull(userCreationController.inputName);
        Assert.IsNotNull(userCreationController.avatarsContainer);
        Assert.IsNotNull(userCreationController.avatarPrefab);
        Assert.IsNotNull(userCreationController.backButton);
        Assert.IsTrue(UserCreationScreen.canGoBack);
    }

    /// <summary>
    /// Test whether the screen is correctly initialized
    /// </summary>
    [UnityTest]
    public IEnumerator Test_Start()
    {
        yield return Setup_UserCreationScreen();

        var userCreationController = GameObject.FindObjectOfType<UserCreationScreen>();
        Assert.IsFalse(userCreationController.errorMessage.activeSelf);
        Assert.IsTrue(userCreationController.backButton.activeSelf);

        var avatars = userCreationController.avatarsContainer.GetComponentsInChildren<Button>().ToList()
            .ConvertAll((b) => b.GetComponentsInChildren<Image>().Except(b.GetComponents<Image>()).First());

        Assert.AreEqual(UserList.AVATARS.Count, avatars.Count);
        for (int i = 0; i < avatars.Count; i++)
            Assert.AreEqual(UserList.AVATARS[i], avatars[i].sprite);
    }

    /// <summary>
    /// Test whether the screen is correctly initialized (from invalid savefile)
    /// </summary>
    [UnityTest]
    public IEnumerator Test_Start_InvalidSavefile()
    {
        string path = $"{Application.persistentDataPath}/wesign_unit_test.json";
        File.Delete(path);
        PersistentDataController.PATH = path;
        PersistentDataController.GetInstance().Load();
        AssetDatabase.LoadAssetAtPath<UserAvatarList>("Assets/Accounts/ScriptableObjects/UserAvatarList.asset").Awake();

        SystemController.GetInstance().SwapScene("Common/Scenes/Boot");
        yield return new WaitForSeconds(WAIT_TIME);

        var userCreationController = GameObject.FindObjectOfType<UserCreationScreen>();
        Assert.IsNotNull(userCreationController);
        Assert.IsFalse(userCreationController.backButton.activeSelf);
    }

    /// <summary>
    /// Test whether a new user can be created
    /// </summary>
    [UnityTest]
    public IEnumerator Test_CreateUser_Valid()
    {
        yield return Setup_UserCreationScreen("Common/Scenes/MainMenuScreen");

        SystemController.GetInstance().LoadNextScene("Accounts/Scenes/UserCreationScreen");
        yield return new WaitForSeconds(WAIT_TIME);

        var userCreationController = GameObject.FindObjectOfType<UserCreationScreen>();
        userCreationController.inputName.text = "newTester";
        userCreationController.CreateUser();
        Assert.IsFalse(userCreationController.errorMessage.activeSelf);
        yield return new WaitForSeconds(WAIT_TIME);

        Assert.AreEqual(SystemController.GetSceneIndex("Common/Scenes/MainMenuScreen"), SystemController.GetInstance().currentScene);
    }

    /// <summary>
    /// Test whether no new user is created when the username is too long
    /// </summary>
    [UnityTest]
    public IEnumerator Test_CreateUser_UsernameTooLong()
    {
        yield return Setup_UserCreationScreen();

        var userCreationController = GameObject.FindObjectOfType<UserCreationScreen>();
        userCreationController.inputName.text = "aninvalidsuperduperlongusername";
        userCreationController.CreateUser();
        Assert.IsTrue(userCreationController.errorMessage.activeSelf);
        Assert.AreEqual("Je gebruikersnaam moet bestaan uit minimum 1 en maximum 12 letters (a-z en A-Z) of cijfers (0-9).", userCreationController.errorMessage.GetComponent<TMP_Text>().text);
    }


    /// <summary>
    /// Test whether no new user is created when the username contains invalid characters
    /// </summary>
    [UnityTest]
    public IEnumerator Test_CreateUser_UsernameInvalidChars()
    {
        yield return Setup_UserCreationScreen();

        var userCreationController = GameObject.FindObjectOfType<UserCreationScreen>();
        userCreationController.inputName.text = "! an invalid username !";
        userCreationController.CreateUser();
        Assert.IsTrue(userCreationController.errorMessage.activeSelf);
        Assert.AreEqual("Je gebruikersnaam moet bestaan uit minimum 1 en maximum 12 letters (a-z en A-Z) of cijfers (0-9).", userCreationController.errorMessage.GetComponent<TMP_Text>().text);
    }


    /// <summary>
    /// Test whether no new user is created when the username already exists
    /// </summary>
    [UnityTest]
    public IEnumerator Test_CreateUser_UsernameAlreadyExists()
    {
        yield return Setup_UserCreationScreen();

        var userCreationController = GameObject.FindObjectOfType<UserCreationScreen>();
        userCreationController.inputName.text = "Tester0";
        userCreationController.CreateUser();
        Assert.IsTrue(userCreationController.errorMessage.activeSelf);
        Assert.AreEqual("Deze gebruikersnaam bestaat al! Kies een andere.", userCreationController.errorMessage.GetComponent<TMP_Text>().text);
    }
}