using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.FeatureManagement.Mvc;
using LCU.API.Internal.Operations.IncentiveApi.Configuration;
using LCU.API.Internal.Operations.IncentiveApi.Extensions;
using LCU.API.Internal.Operations.IncentiveApiLib.Services;
using LCU.API.Internal.Operations.IncentiveApiLib.Persistence;
using LCU.Library.Internal.IncentiveApiModels.Requests;
using LCU.Library.Internal.IncentiveApiModels.Common;
using LCU.API.Internal.Operations.IncentiveApi.Models.DataTransfer;
using LCU.API.Internal.Operations.IncentiveApi.Models.Dayforce;
using LCU.API.Internal.Operations.IncentiveApi.Authorization;
using LCU.API.Internal.Operations.IncentiveApi.Exceptions;
using LCU.API.Internal.Operations.IncentiveApi.Services.Dayforce;

namespace LCU.API.Internal.Operations.IncentiveApi.Controllers;

[FeatureGate(FeatureFlags.EnableControllers)]
[Authorize(AuthenticationSchemes = JwtBearerDefaults.AuthenticationScheme)]
[ApiController]
[Route("api/[controller]")]
public class EmployeeController : ControllerBase
{
    private readonly ICurrentUserService _currentUserService;
    private readonly IDayForceSyncService _dayForceSyncService;
    private readonly IUserService _userService;

    public EmployeeController(
        ICurrentUserService currentUserService,
        IDayForceSyncService dayForceSyncService,
        IUserService userService
    )
    {
        _currentUserService = currentUserService;
        _dayForceSyncService = dayForceSyncService;
        _userService = userService;
    }

    [HttpGet("")]
    public async Task<IActionResult> GetAllUsers([FromQuery] string query, [FromQuery] string role)
    {
        try
        {
            var searchRequest = new UserSearchRequest
            {
                Query = query,
                Role = role
            };
            var result = await _userService.GetAllUsersAsync(searchRequest);
            return Ok(result);
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [HttpGet("terminated")]
    [RequirePermission("GENERATE_PAYOUT_FILES")]
    public IActionResult GetTerminatedUsers([FromQuery] int month, [FromQuery] int year)
    {
        try
        {
            var monthRange = new MonthRange(year, month);
            var result = _userService.GetTerminatedUsersAsync(monthRange);
            return Ok(result);
        }
        catch (ArgumentException ex)
        {
            Log.Error(ex, $"Bad Request in {GetType().Name}");
            return BadRequest(ex.Message);
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [HttpGet("resolve")]
    public async Task<IActionResult> ResolveUser(
        [FromQuery] string employeeId = null,
        [FromQuery] string email = null
    )
    {
        try
        {
            var count = 0;
            if (!string.IsNullOrWhiteSpace(employeeId))
            {
                count++;
            }

            if (!string.IsNullOrWhiteSpace(email))
            {
                count++;
            }

            if (count > 1)
            {
                return BadRequest("Please provide only one query argument.");
            }

            var result = await _userService.FindUserAsync(employeeId, email);
            return Ok(result);
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [HttpGet("me")]
    public async Task<IActionResult> GetCurrentEmployee()
    {
        try
        {
            var currentUser = _currentUserService.GetCurrentUser();
            if (currentUser?.Email == null)
            {
                Log.Warning("Failed To Get Current User From Auth Context");
                return Unauthorized("No AD User Found.");
            }

            var result = await _userService.GetUserByAdEmailAsync(currentUser.Email);
            if (result == null)
            {
                Log.Warning($"Failed To Get Current User From Email: {currentUser.Email}");
                return NoContent();
            }

            return Ok(result);
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [HttpGet("{employeeId}")]
    [RequirePermission("ASSIGN_PERMISSIONS_TO_ASSOCIATES,ASSIGN_ASSOCIATES_TO_DEPARTMENT")]
    public async Task<IActionResult> GetEmployeeById(string employeeId = null)
    {
        try
        {
            if (employeeId == null)
            {
                return BadRequest("no_employee_id");
            }

            var result = await _userService.GetUserByEmployeeIdAsync(employeeId);
            if (result == null)
            {
                return NoContent();
            }

            return Ok(result);
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [RequirePermission("ASSIGN_ASSOCIATES_TO_DEPARTMENT")]
    [HttpPost("{employeeId}/AssignDept", Name = "AssignDept")]
    public async Task<IActionResult> AssignDepartment(
        string employeeId,
        [FromBody] DepartmentAssignmentRequest assignment
    )
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState.GetErrorMessages());
        }

        try
        {
            var currentUser = _currentUserService.GetCurrentUser();
            if (currentUser?.Email == null)
            {
                return Unauthorized("No AD User Found.");
            }

            var employee = await _userService.GetUserByAdEmailAsync(currentUser.Email);
            if (UserService.ValidateChangePermission(employee.EmployeeId, employeeId))
            {
                return StatusCode(403, "Not allowed to assign yourself to a department.");
            }

            await _userService.AssignDepartments(employeeId, assignment);
            return (Ok());
        }
        catch (NotFoundException ex)
        {
            return NotFound(ex.Message);
        }
        catch (BadDepartmentAssignmentException ex)
        {
            return BadRequest(ex.Message);
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [HttpPut("{employeeId}/UpdatePerms", Name = "UpdatePerms")]
    public async Task<IActionResult> AssignPermission(
        string employeeId,
        [FromBody] AdditionalPermissionRequest request
    )
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState.GetErrorMessages());
        }

        try
        {
            var response = await _userService.UpdatePermissions(employeeId, request);
            return Ok(response);
        }
        catch (NotFoundException ex)
        {
            return NotFound(ex.Message);
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [RequirePermission("ASSIGN_ASSOCIATES_TO_DEPARTMENT")]
    [HttpPost("{employeeId}/UpdateDept/{assignmentId:int}", Name = "UpdateDept")]
    public async Task<IActionResult> UpdateDepartmentAssignment(
        string employeeId,
        int assignmentId,
        [FromBody] DepartmentUpdateRequest request
    )
    {
        try
        {
            var currentUser = _currentUserService.GetCurrentUser();
            if (currentUser?.Email == null)
            {
                return Unauthorized("No AD User Found.");
            }

            var employee = await _userService.GetUserByAdEmailAsync(currentUser.Email);
            if (UserService.ValidateChangePermission(employee.EmployeeId, employeeId))
            {
                return StatusCode(403, "Not allowed to terminate yourself from a department.");
            }

            await _userService.UpdateDepartmentAssignment(request);
            return (Ok());
        }
        catch (NotFoundException ex)
        {
            return NotFound(ex.Message);
        }
        catch (BadDepartmentAssignmentException ex)
        {
            return BadRequest(ex.Message);
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [HttpGet("GetHcmSystemUsers")]
    [RequirePermission("MANAGE_EMPLOYEE_DETAILS")]
    public async Task<IActionResult> GetHcmSystemUsers(string email = "", string employeeId = "", string fullName = "")
    {
        try
        {
            var result = await _dayForceSyncService.GetMatchingHcmUsers(email, employeeId, fullName);
            return Ok(result);
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [HttpPost("UpdateEmployeeDetails", Name = "UpdateEmployeeDetails")]
    [RequirePermission("MANAGE_EMPLOYEE_DETAILS")]
    public async Task<IActionResult> UpdateEmployeeDetails([FromBody] EmployeeDetailsUpdate request)
    {
        try
        {
            var currentUser = _currentUserService.GetCurrentUser();
            if (currentUser?.Email == null)
            {
                return Unauthorized("No AD User Found.");
            }

            var result = await _userService.GetUserByAdEmailAsync(request.OldEmail);
            if (result == null)
            {
                return NoContent();
            }

            var updatedUserResult = await _dayForceSyncService.UpdateEmployeeDetails(request);

            if (updatedUserResult.UpdatedSuccessfully)
            {
                return Ok(updatedUserResult);
            }

            return BadRequest(updatedUserResult);
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [HttpGet("SyncEmployeeIds")]
    [RequirePermission("MANAGE_EMPLOYEE_DETAILS")]
    public async Task<IActionResult> SyncEmployeeIds()
    {
        try
        {
            var result = await _userService.SyncActiveUserIds();
            return Ok(result);
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }

    [HttpPost("sync", Name = "ForceRefresh")]
    public async Task<IActionResult> SyncDayForce()
    {
        try
        {
            Log.Information("DayForce Sync was forced");
            var request = new DayforceProcessRequest();
            await _dayForceSyncService.SyncDayForceUsers(request);
            Log.Information("DayForce forced Sync has completed");
            return Ok();
        }
        catch (Exception ex)
        {
            Log.Information("DayForce forced Sync has failed");
            Log.Error(ex, $"Failure in {GetType().Name}");
            return StatusCode(StatusCodes.Status500InternalServerError);
        }
    }
}