@using ShiftScheduler.Shared
@using System.Text.Json
@inject HttpClient HttpClient
@inject IJSRuntime JSRuntime

<div class="modal @(IsVisible ? "show" : "")" style="display: @(IsVisible ? "block" : "none")" tabindex="-1">
    <div class="modal-dialog modal-lg">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title">Configuration</h5>
                <button type="button" class="btn-close" @onclick="Close" aria-label="Close"></button>
            </div>
            <div class="modal-body">
                @if (_isLoading)
                {
                    <div class="text-center">
                        <div class="spinner-border" role="status">
                            <span class="visually-hidden">Loading...</span>
                        </div>
                        <p>Loading configuration...</p>
                    </div>
                }
                else
                {
                    <div class="row">
                        <div class="col-12 mb-3">
                            <div class="d-flex gap-2">
                                <button class="btn btn-outline-primary" @onclick="ExportConfiguration">Export Configuration</button>
                                <button class="btn btn-outline-secondary" @onclick="() => _showImportSection = !_showImportSection">
                                    @(_showImportSection ? "Hide Import" : "Import Configuration")
                                </button>
                            </div>
                        </div>
                        
                        @if (_showImportSection)
                        {
                            <div class="col-12 mb-3">
                                <div class="card">
                                    <div class="card-body">
                                        <h6 class="card-title">Import Configuration</h6>
                                        <div class="mb-3">
                                            <label for="configFile" class="form-label">Select configuration file:</label>
                                            <input type="file" class="form-control" id="configFile" accept=".json" @ref="_fileInput" />
                                        </div>
                                        <button class="btn btn-primary" @onclick="ImportConfiguration">Import</button>
                                    </div>
                                </div>
                            </div>
                        }
                    </div>

                    <div class="row">
                        <!-- Transport Configuration -->
                        <div class="col-md-6">
                            <h6>Transport Configuration</h6>
                            <div class="mb-3">
                                <label class="form-label">Start Station</label>
                                <input type="text" class="form-control" @bind="_config.Transport.StartStation" />
                            </div>
                            <div class="mb-3">
                                <label class="form-label">End Station</label>
                                <input type="text" class="form-control" @bind="_config.Transport.EndStation" />
                            </div>
                            <div class="mb-3">
                                <label class="form-label">API Base URL</label>
                                <input type="text" class="form-control" @bind="_config.Transport.ApiBaseUrl" />
                            </div>
                            <div class="mb-3">
                                <label class="form-label">Safety Buffer (minutes)</label>
                                <input type="number" class="form-control" @bind="_config.Transport.SafetyBufferMinutes" />
                            </div>
                            <div class="mb-3">
                                <label class="form-label">Min Break (minutes)</label>
                                <input type="number" class="form-control" @bind="_config.Transport.MinBreakMinutes" />
                            </div>
                            <div class="mb-3">
                                <label class="form-label">Max Early Arrival (minutes)</label>
                                <input type="number" class="form-control" @bind="_config.Transport.MaxEarlyArrivalMinutes" />
                            </div>
                            <div class="mb-3">
                                <label class="form-label">Max Late Arrival (minutes)</label>
                                <input type="number" class="form-control" @bind="_config.Transport.MaxLateArrivalMinutes" />
                            </div>
                            <div class="mb-3">
                                <label class="form-label">Cache Duration (days)</label>
                                <input type="number" class="form-control" @bind="_config.Transport.CacheDurationDays" />
                            </div>
                        </div>

                        <!-- Shift Configuration -->
                        <div class="col-md-6">
                            <div class="d-flex justify-content-between align-items-center mb-3">
                                <h6>Shift Configuration</h6>
                                <button class="btn btn-sm btn-success" @onclick="AddShift">Add Shift</button>
                            </div>
                            
                            @for (int i = 0; i < _config.Shifts.Count; i++)
                            {
                                var index = i; // Capture for closure
                                <div class="card mb-2">
                                    <div class="card-body p-2">
                                        <div class="d-flex justify-content-between align-items-start">
                                            <div class="flex-grow-1">
                                                <div class="row g-2">
                                                    <div class="col-6">
                                                        <label class="form-label">Name</label>
                                                        <input type="text" class="form-control form-control-sm" @bind="_config.Shifts[index].Name" />
                                                    </div>
                                                    <div class="col-6">
                                                        <label class="form-label">Icon</label>
                                                        <input type="text" class="form-control form-control-sm" @bind="_config.Shifts[index].Icon" />
                                                    </div>
                                                    <div class="col-6">
                                                        <label class="form-label">Morning Time</label>
                                                        <input type="text" class="form-control form-control-sm" @bind="_config.Shifts[index].MorningTime" placeholder="HH:mm-HH:mm" />
                                                    </div>
                                                    <div class="col-6">
                                                        <label class="form-label">Afternoon Time</label>
                                                        <input type="text" class="form-control form-control-sm" @bind="_config.Shifts[index].AfternoonTime" placeholder="HH:mm-HH:mm" />
                                                    </div>
                                                </div>
                                            </div>
                                            <button class="btn btn-sm btn-danger ms-2" @onclick="() => RemoveShift(index)">
                                                ❌
                                            </button>
                                        </div>
                                    </div>
                                </div>
                            }
                        </div>
                    </div>

                    @if (!string.IsNullOrEmpty(_errorMessage))
                    {
                        <div class="alert alert-danger" role="alert">
                            @_errorMessage
                        </div>
                    }

                    @if (!string.IsNullOrEmpty(_successMessage))
                    {
                        <div class="alert alert-success" role="alert">
                            @_successMessage
                        </div>
                    }
                }
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-secondary" @onclick="Close">Cancel</button>
                <button type="button" class="btn btn-primary" @onclick="Save" disabled="@_isLoading">
                    @if (_isSaving)
                    {
                        <span class="spinner-border spinner-border-sm me-2" role="status" aria-hidden="true"></span>
                    }
                    Save Changes
                </button>
            </div>
        </div>
    </div>
</div>

@if (IsVisible)
{
    <div class="modal-backdrop fade show"></div>
}

<style>
    .modal {
        z-index: 1055;
    }
    .modal-backdrop {
        z-index: 1050;
    }
</style>

@code {
    [Parameter] public bool IsVisible { get; set; }
    [Parameter] public EventCallback OnClose { get; set; }
    [Parameter] public EventCallback OnConfigurationChanged { get; set; }

    private ApplicationConfiguration _config = new();
    private bool _isLoading = false;
    private bool _isSaving = false;
    private bool _showImportSection = false;
    private string _errorMessage = string.Empty;
    private string _successMessage = string.Empty;
    private ElementReference _fileInput;

    protected override async Task OnParametersSetAsync()
    {
        if (IsVisible && (_config.Shifts.Count == 0 || _config.Transport.StartStation == string.Empty))
        {
            await LoadConfiguration();
        }
    }

    private async Task LoadConfiguration()
    {
        _isLoading = true;
        _errorMessage = string.Empty;
        StateHasChanged();

        try
        {
            var response = await HttpClient.GetAsync("api/configuration");
            if (response.IsSuccessStatusCode)
            {
                var json = await response.Content.ReadAsStringAsync();
                _config = JsonSerializer.Deserialize<ApplicationConfiguration>(json, new JsonSerializerOptions
                {
                    PropertyNameCaseInsensitive = true
                }) ?? new ApplicationConfiguration();
            }
            else
            {
                _errorMessage = "Failed to load configuration";
            }
        }
        catch (Exception ex)
        {
            _errorMessage = $"Error loading configuration: {ex.Message}";
        }
        finally
        {
            _isLoading = false;
            StateHasChanged();
        }
    }

    private async Task Save()
    {
        _isSaving = true;
        _errorMessage = string.Empty;
        _successMessage = string.Empty;
        StateHasChanged();

        try
        {
            var response = await HttpClient.PutAsJsonAsync("api/configuration", _config);
            if (response.IsSuccessStatusCode)
            {
                _successMessage = "Configuration saved successfully!";
                await OnConfigurationChanged.InvokeAsync();
                await Task.Delay(1000); // Show success message briefly
                await Close();
            }
            else
            {
                _errorMessage = "Failed to save configuration";
            }
        }
        catch (Exception ex)
        {
            _errorMessage = $"Error saving configuration: {ex.Message}";
        }
        finally
        {
            _isSaving = false;
            StateHasChanged();
        }
    }

    private async Task ExportConfiguration()
    {
        try
        {
            var response = await HttpClient.GetAsync("api/configuration/export");
            if (response.IsSuccessStatusCode)
            {
                var bytes = await response.Content.ReadAsByteArrayAsync();
                var base64 = Convert.ToBase64String(bytes);
                await JSRuntime.InvokeVoidAsync("downloadFile", "ShiftScheduler-Configuration.json", "application/json", base64);
            }
        }
        catch (Exception ex)
        {
            _errorMessage = $"Error exporting configuration: {ex.Message}";
            StateHasChanged();
        }
    }

    private async Task ImportConfiguration()
    {
        try
        {
            var result = await JSRuntime.InvokeAsync<string>("readFileAsText", _fileInput);
            if (!string.IsNullOrEmpty(result))
            {
                var request = new { JsonContent = result };
                var response = await HttpClient.PostAsJsonAsync("api/configuration/import", request);
                if (response.IsSuccessStatusCode)
                {
                    await LoadConfiguration();
                    _successMessage = "Configuration imported successfully!";
                    _showImportSection = false;
                }
                else
                {
                    _errorMessage = "Failed to import configuration";
                }
            }
        }
        catch (Exception ex)
        {
            _errorMessage = $"Error importing configuration: {ex.Message}";
        }
        StateHasChanged();
    }

    private void AddShift()
    {
        _config.Shifts.Add(new Shift
        {
            Name = "New Shift",
            Icon = "⭐",
            MorningTime = "",
            AfternoonTime = ""
        });
        StateHasChanged();
    }

    private void RemoveShift(int index)
    {
        if (index >= 0 && index < _config.Shifts.Count)
        {
            _config.Shifts.RemoveAt(index);
            StateHasChanged();
        }
    }

    private async Task Close()
    {
        _errorMessage = string.Empty;
        _successMessage = string.Empty;
        _showImportSection = false;
        await OnClose.InvokeAsync();
    }
}