GmRelayBot/src/GmRelay.Web/Components/Pages/EditSession.razor

@page "/session/edit/{SessionId:guid}"
@using GmRelay.Web.Services
@using GmRelay.Shared.Domain
@using Microsoft.AspNetCore.Authorization
@attribute [Authorize]
@inject SessionService SessionService
@inject NavigationManager Navigation

<PageTitle>Edit Session - GM-Relay</PageTitle>

<div class="container mt-4">
    <nav aria-label="breadcrumb">
      <ol class="breadcrumb">
        <li class="breadcrumb-item"><a href="/">Dashboard</a></li>
        <li class="breadcrumb-item active">Edit Session</li>
      </ol>
    </nav>

    <h2>Edit Session</h2>

    @if (session == null)
    {
        <p>Loading session details...</p>
    }
    else
    {
        <div class="card shadow-sm mt-4">
            <div class="card-body">
                <EditForm Model="@model" OnValidSubmit="HandleSubmit">
                    <div class="mb-3">
                        <label class="form-label font-weight-bold">Game Title</label>
                        <InputText @bind-Value="model.Title" class="form-control" placeholder="e.g. D&D 5e: Dragon's Hoard" />
                        <div class="form-text">Changing this will update all sessions in the same batch.</div>
                    </div>

                    <div class="mb-3">
                        <label class="form-label font-weight-bold">Scheduled Time (Moscow UTC+3)</label>
                        <input type="datetime-local" @bind="model.ScheduledAtLocal" class="form-control" />
                        <div class="form-text">Current: @session.ScheduledAt.FormatMoscow()</div>
                    </div>

                    <div class="mb-3">
                        <label class="form-label font-weight-bold">Join Link</label>
                        <InputText @bind-Value="model.JoinLink" class="form-control" placeholder="Discord or VTT link" />
                    </div>

                    <div class="mt-4">
                        <button type="submit" class="btn btn-success" disabled="@isSubmitting">
                            @(isSubmitting ? "Saving..." : "Save Changes")
                        </button>
                        <button type="button" class="btn btn-outline-secondary ms-2" @onclick="GoBack">Cancel</button>
                    </div>
                </EditForm>
            </div>
        </div>
        
        @if (!string.IsNullOrEmpty(errorMessage))
        {
            <div class="alert alert-danger mt-3">@errorMessage</div>
        }
    }
</div>

@code {
    [Parameter] public Guid SessionId { get; set; }
    private WebSession? session;
    private SessionEditModel model = new();
    private bool isSubmitting = false;
    private string? errorMessage;

    protected override async Task OnInitializedAsync()
    {
        session = await SessionService.GetSessionAsync(SessionId);
        if (session != null)
        {
            model.Title = session.Title;
            // Convert UTC to Moscow for the picker
            model.ScheduledAtLocal = session.ScheduledAt.ToMoscow();
            model.JoinLink = session.JoinLink;
        }
    }

    private async Task HandleSubmit()
    {
        isSubmitting = true;
        errorMessage = null;

        try
        {
            // The value from <input type="datetime-local"> is considered as "unspecified" or local to browser.
            // We treat it as Moscow time (UTC+3) and convert to UTC.
            var utcTime = new DateTimeOffset(model.ScheduledAtLocal, TimeSpan.FromHours(3)).ToUniversalTime().UtcDateTime;

            await SessionService.UpdateSessionAsync(SessionId, model.Title, utcTime, model.JoinLink);
            Navigation.NavigateTo($"/group/{session!.GroupId}");
        }
        catch (Exception ex)
        {
            errorMessage = "Failed to save changes: " + ex.Message;
        }
        finally
        {
            isSubmitting = false;
        }
    }

    private void GoBack() => Navigation.NavigateTo("/");

    public class SessionEditModel
    {
        public string Title { get; set; } = "";
        public DateTime ScheduledAtLocal { get; set; } = DateTime.Now;
        public string JoinLink { get; set; } = "";
    }
}