#nullable enable
using System;
using System.Linq;
using System.Threading.Tasks;
using BTCPayServer.Abstractions.Constants;
using BTCPayServer.Abstractions.Extensions;
using BTCPayServer.Abstractions.Models;
using BTCPayServer.Client;
using BTCPayServer.Data;
using BTCPayServer.Events;
using BTCPayServer.Models.StoreViewModels;
using BTCPayServer.Services;
using BTCPayServer.Services.Mails;
using BTCPayServer.Services.Stores;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using static BTCPayServer.Services.Stores.StoreRepository;

namespace BTCPayServer.Controllers;

public partial class UIStoresController
{
    [HttpGet("{storeId}/users")]
    public async Task<IActionResult> StoreUsers()
    {
        var vm = new StoreUsersViewModel { Role = StoreRoleId.Employee.Role };
        await FillUsers(vm);
        return View(vm);
    }

    [HttpPost("{storeId}/users")]
    [Authorize(Policy = Policies.CanModifyStoreSettings, AuthenticationSchemes = AuthenticationSchemes.Cookie)]
    public async Task<IActionResult> StoreUsers(string storeId, StoreUsersViewModel vm)
    {
        await FillUsers(vm);
        if (!ModelState.IsValid)
        {
            return View(vm);
        }

        var roleId = await _storeRepo.ResolveStoreRoleId(storeId, vm.Role);
        if (roleId is null)
        {
            ModelState.AddModelError(nameof(vm.Role), StringLocalizer["Invalid role"]);
            return View(vm);
        }
            
        var user = await _userManager.FindByEmailAsync(vm.Email);
        if (user is null)
        {
            ModelState.AddModelError(nameof(vm.Email), StringLocalizer["This user does not exist"]);
            return View(vm);
        }
        var isExistingStoreUser = await _storeRepo.GetStoreUser(storeId, user.Id) is not null;
        
		var res = await _storeRepo.AddOrUpdateStoreUser(CurrentStore.Id, user.Id, roleId);
		if (res is AddOrUpdateStoreUserResult.Success)
		{
            TempData.SetStatusMessageModel(new StatusMessageModel
            {
                Severity = StatusMessageModel.StatusSeverity.Success,
                AllowDismiss = false,
                Message = isExistingStoreUser  
                                ? StringLocalizer["The user has been updated successfully."].Value
                                : StringLocalizer["The user has been added successfully."].Value,
            });
            return RedirectToAction(nameof(StoreUsers));
        }
        else
        {
            ModelState.AddModelError(nameof(vm.Email),
                isExistingStoreUser
                    ? StringLocalizer["The user could not be updated: {0}", res.ToString()]
                    : StringLocalizer["The user could not be added: {0}", res.ToString()]
                );
            return View(vm);
        }
    }

    [HttpPost("{storeId}/users/{userId}")]
    [Authorize(Policy = Policies.CanModifyStoreSettings, AuthenticationSchemes = AuthenticationSchemes.Cookie)]
    public async Task<IActionResult> UpdateStoreUser(string storeId, string userId, StoreUsersViewModel.StoreUserViewModel vm)
    {
        var roleId = await _storeRepo.ResolveStoreRoleId(storeId, vm.Role);
        var storeUsers = await _storeRepo.GetStoreUsers(storeId);
        var user = storeUsers.First(user => user.Id == userId);

        var res = await _storeRepo.AddOrUpdateStoreUser(storeId, userId, roleId);
        if (res is AddOrUpdateStoreUserResult.Success)
        {
            TempData[WellKnownTempData.SuccessMessage] = StringLocalizer["The role of {0} has been changed to {1}.", user.Email, vm.Role].Value;
        }
        else
        {
            TempData[WellKnownTempData.ErrorMessage] = StringLocalizer["Changing the role of user {0} failed: {1}", user.Email, res.ToString()].Value;
        }
        return RedirectToAction(nameof(StoreUsers), new { storeId, userId });
    }

    [HttpPost("{storeId}/users/{userId}/delete")]
    [Authorize(Policy = Policies.CanModifyStoreSettings, AuthenticationSchemes = AuthenticationSchemes.Cookie)]
    public async Task<IActionResult> DeleteStoreUser(string storeId, string userId)
    {
        if (await _storeRepo.RemoveStoreUser(storeId, userId))
            TempData[WellKnownTempData.SuccessMessage] = StringLocalizer["User removed successfully."].Value;
        else
            TempData[WellKnownTempData.ErrorMessage] = StringLocalizer["Removing this user would result in the store having no owner."].Value;
        return RedirectToAction(nameof(StoreUsers), new { storeId, userId });
    }

    private async Task FillUsers(StoreUsersViewModel vm)
    {
        var users = await _storeRepo.GetStoreUsers(CurrentStore.Id);
        vm.StoreId = CurrentStore.Id;
        vm.Users = users.Select(u => new StoreUsersViewModel.StoreUserViewModel
        {
            Email = u.Email,
            Name = u.UserBlob.Name,
            ImageUrl = u.UserBlob.ImageUrl,
            Id = u.Id,
            Role = u.StoreRole.Role
        }).ToList();
    }
}