@using Indotalent.ConfigBackEnd.Extensions
@using Indotalent.Features.Leave.LeaveRequest
@using Indotalent.Features.Leave.LeaveRequest.Cqrs
@using Indotalent.Features.Leave.LeaveCategory
@using Indotalent.Features.Leave.LeaveCategory.Cqrs
@using Indotalent.Shared.Utils
@using MudBlazor
@inject LeaveRequestService LeaveRequestService
@inject LeaveCategoryService LeaveCategoryService
@inject ISnackbar Snackbar

<MudPaper Elevation="0" Square="true" Class="pa-6 mb-3 d-flex align-center justify-space-between" Style="border: 1px solid #DCEBFA;">
    <div class="d-flex align-center gap-4">
        <MudIconButton Icon="@Icons.Material.Filled.ArrowBack" OnClick="() => OnCancel.InvokeAsync()" />
        <div>
            <MudText Typo="Typo.h5" Style="font-weight: 900; color: #1a1a1a;">@(ReadOnly ? "Request Details" : "Edit Request")</MudText>
            <MudText Typo="Typo.body2" Style="color: #64748b;">Reviewing leave application details and status.</MudText>
        </div>
    </div>
</MudPaper>

<MudPaper Elevation="0" Outlined="true" Class="pa-8" Style="border-radius: 0px; border: 1px solid #DCEBFA;">
    @if (_isInitialLoading)
    {
        <div class="d-flex flex-column align-center justify-center pa-10">
            <MudProgressCircular Color="Color.Primary" Indeterminate="true" Size="Size.Large" />
            <MudText Typo="Typo.body2" Class="mt-4">Loading application data...</MudText>
        </div>
    }
    else
    {
        <MudForm @ref="_form" Model="_model">
            <MudGrid Spacing="3">
                <MudItem xs="12" sm="6">
                    <MudText Typo="Typo.subtitle2" Class="mb-1">Employee</MudText>
                    <MudSelect T="string" @bind-Value="_model.EmployeeId"
                               ReadOnly="ReadOnly"
                               Variant="Variant.Outlined" Margin="Margin.Dense"
                               AnchorOrigin="Origin.BottomLeft" TransformOrigin="Origin.TopLeft">
                        @foreach (var emp in _employees)
                        {
                            <MudSelectItem Value="@emp.Id">@emp.FullName (@emp.Code)</MudSelectItem>
                        }
                    </MudSelect>
                </MudItem>
                <MudItem xs="12" sm="6">
                    <MudText Typo="Typo.subtitle2" Class="mb-1">Leave Type</MudText>
                    <MudSelect T="string" @bind-Value="_model.LeaveCategoryId"
                               ReadOnly="ReadOnly"
                               Variant="Variant.Outlined" Margin="Margin.Dense"
                               AnchorOrigin="Origin.BottomLeft" TransformOrigin="Origin.TopLeft">
                        @foreach (var cat in _categories)
                        {
                            <MudSelectItem Value="@cat.Id">@cat.Name</MudSelectItem>
                        }
                    </MudSelect>
                </MudItem>
                <MudItem xs="12" sm="4">
                    <MudText Typo="Typo.subtitle2" Class="mb-1">Start Date</MudText>
                    <MudDatePicker @bind-Date="_startDate" ReadOnly="ReadOnly" Variant="Variant.Outlined" Margin="Margin.Dense" />
                </MudItem>
                <MudItem xs="12" sm="4">
                    <MudText Typo="Typo.subtitle2" Class="mb-1">End Date</MudText>
                    <MudDatePicker @bind-Date="_endDate" ReadOnly="ReadOnly" Variant="Variant.Outlined" Margin="Margin.Dense" />
                </MudItem>
                <MudItem xs="12" sm="4">
                    <MudText Typo="Typo.subtitle2" Class="mb-1">Total Days</MudText>
                    <MudNumericField @bind-Value="_model.Days" ReadOnly="true" Variant="Variant.Outlined" Margin="Margin.Dense" FullWidth="true" />
                </MudItem>
                <MudItem xs="12">
                    <MudText Typo="Typo.subtitle2" Class="mb-1">Reason</MudText>
                    <MudTextField @bind-Value="_model.Reason" ReadOnly="ReadOnly" Variant="Variant.Outlined" Margin="Margin.Dense" FullWidth="true" Lines="2" />
                </MudItem>

                @if (!ReadOnly && _model.Status == "Pending")
                {
                    <MudItem xs="12" Class="mt-4">
                        <MudText Typo="Typo.button" Color="Color.Primary" Style="font-weight: 800;">Approval Action</MudText>
                        <MudDivider Class="mt-2 mb-4" />
                    </MudItem>
                    <MudItem xs="12" sm="6">
                        <MudText Typo="Typo.subtitle2" Class="mb-1">Decision Status</MudText>
                        <MudSelect @bind-Value="_model.Status"
                                   Variant="Variant.Outlined"
                                   Margin="Margin.Dense"
                                   AnchorOrigin="Origin.BottomLeft"
                                   TransformOrigin="Origin.TopLeft">
                            <MudSelectItem Value="@("Pending")">Pending</MudSelectItem>
                            <MudSelectItem Value="@("Approved")">Approved</MudSelectItem>
                            <MudSelectItem Value="@("Rejected")">Rejected</MudSelectItem>
                        </MudSelect>
                    </MudItem>
                    <MudItem xs="12" sm="6">
                        <MudText Typo="Typo.subtitle2" Class="mb-1">Notes / Reject Reason</MudText>
                        <MudTextField @bind-Value="_model.RejectReason"
                                      Variant="Variant.Outlined"
                                      Margin="Margin.Dense"
                                      FullWidth="true"
                                      Placeholder="Provide reason if rejected..." />
                    </MudItem>
                }

                <MudItem xs="12" Class="mt-4">
                    <MudText Typo="Typo.button" Color="Color.Primary" Style="font-weight: 800;">Audit & Action History</MudText>
                    <MudDivider Class="mt-2 mb-4" />
                </MudItem>
                <MudItem xs="12" sm="6">
                    <MudText Typo="Typo.subtitle2">Created At</MudText>
                    <MudText Typo="Typo.body2" Style="color: #1a1a1a; font-weight: 600;">@DateTimeExtensions.ToString(_model.CreatedAt)</MudText>
                </MudItem>
                <MudItem xs="12" sm="6">
                    <MudText Typo="Typo.subtitle2">Created By</MudText>
                    <MudText Typo="Typo.body2" Style="color: #1a1a1a; font-weight: 600;">@(!string.IsNullOrEmpty(_model.CreatedBy) ? _model.CreatedBy : "System")</MudText>
                </MudItem>
                <MudItem xs="12" sm="6">
                    <MudText Typo="Typo.subtitle2">Action By</MudText>
                    <MudText Typo="Typo.body2" Style="color: #1a1a1a; font-weight: 600;">@(!string.IsNullOrEmpty(_model.ApproverId) ? _model.ApproverId : "-")</MudText>
                </MudItem>
                <MudItem xs="12" sm="6">
                    <MudText Typo="Typo.subtitle2">Action Date</MudText>
                    <MudText Typo="Typo.body2" Style="color: #1a1a1a; font-weight: 600;">@(_model.ActionDate.HasValue? _model.ActionDate.Value.ToString("dd MMM yyyy HH:mm") : "-")</MudText>
                </MudItem>
            </MudGrid>

            <div class="d-flex justify-end gap-2 mt-10">
                <MudButton OnClick="() => OnCancel.InvokeAsync()" Variant="Variant.Outlined" Disabled="_processing" Style="border: 1px solid #e0e0e0; border-radius: 4px; text-transform: none; font-weight: 700;">@(ReadOnly ? "Back to List" : "Cancel")</MudButton>
                @if (!ReadOnly)
                {
                    <MudButton Color="Color.Primary" Variant="Variant.Filled" OnClick="Submit" Disabled="_processing" Style="border-radius: 4px; text-transform: none; font-weight: 700;">
                        @if (_processing)
                        {
                            <MudProgressCircular Size="Size.Small" Indeterminate="true" />
                        }
                        else
                        {
                            <MudText>Save Changes</MudText>
                        }
                    </MudButton>
                }
            </div>
        </MudForm>
    }
</MudPaper>

@code {
    [Parameter] public UpdateLeaveRequestRequest Data { get; set; } = new();
    [Parameter] public bool ReadOnly { get; set; } = false;
    [Parameter] public EventCallback OnCancel { get; set; }
    [Parameter] public EventCallback OnSuccess { get; set; }

    private MudForm _form = default!;
    private UpdateLeaveRequestValidator _validator = new();
    private UpdateLeaveRequestRequest _model = new();
    private List<EmployeeLeaveReferenceResponse> _employees = new();
    private List<GetLeaveCategoryListResponse> _categories = new();
    private bool _processing = false;
    private bool _isInitialLoading = true;

    private DateTime? _startDate { get => _model.StartDate; set { _model.StartDate = value ?? DateTime.Today; CalculateDays(); } }
    private DateTime? _endDate { get => _model.EndDate; set { _model.EndDate = value ?? DateTime.Today; CalculateDays(); } }

    protected override async Task OnInitializedAsync()
    {
        _isInitialLoading = true;
        try
        {
            _model = new UpdateLeaveRequestRequest
            {
                Id = Data.Id,
                EmployeeId = Data.EmployeeId,
                EmployeeName = Data.EmployeeName,
                LeaveCategoryId = Data.LeaveCategoryId,
                LeaveType = Data.LeaveType,
                StartDate = Data.StartDate,
                EndDate = Data.EndDate,
                Days = Data.Days,
                Reason = Data.Reason,
                Status = Data.Status,
                AttachmentPath = Data.AttachmentPath,
                ApproverId = Data.ApproverId,
                ActionDate = Data.ActionDate,
                RejectReason = Data.RejectReason,
                CreatedAt = Data.CreatedAt,
                CreatedBy = Data.CreatedBy,
                UpdatedAt = Data.UpdatedAt,
                UpdatedBy = Data.UpdatedBy
            };

            var empRes = await LeaveRequestService.GetEmployeeReferenceAsync();
            if (empRes != null && empRes.IsSuccess) _employees = empRes.Value ?? new();

            var catRes = await LeaveCategoryService.GetLeaveCategoryListAsync();
            if (catRes != null && catRes.IsSuccess) _categories = catRes.Value ?? new();
        }
        finally
        {
            _isInitialLoading = false;
        }
    }

    private void CalculateDays()
    {
        _model.Days = (_model.EndDate - _model.StartDate).TotalDays + 1;
        if (_model.Days < 0) _model.Days = 0;
    }

    private async Task Submit()
    {
        if (ReadOnly) return;
        await _form.Validate();
        if (!_form.IsValid) return;
        _processing = true;
        try
        {
            var response = await LeaveRequestService.UpdateLeaveRequestAsync(_model);
            await Task.Delay(500);
            if (response != null && response.IsSuccess)
            {
                Snackbar.Add("Request updated successfully", Severity.Success);
                await OnSuccess.InvokeAsync();
            }
        }
        finally { _processing = false; }
    }
}