@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>Редактирование сессии — GM-Relay</PageTitle>

<div class="page-container">
    <ul class="gm-breadcrumb animate-fade-in">
        <li><a href="/">Главная</a></li>
        <li class="active">Редактирование сессии</li>
    </ul>

    <div class="page-header animate-fade-in">
        <h2>✏️ Редактирование сессии</h2>
    </div>

    @if (session == null)
    {
        <div class="glass-card" style="padding: 2rem;">
            <div class="skeleton skeleton-text" style="width: 50%; margin-bottom: 1.5rem;"></div>
            <div class="skeleton skeleton-text" style="width: 100%; height: 2.5rem; margin-bottom: 1.5rem;"></div>
            <div class="skeleton skeleton-text" style="width: 50%; margin-bottom: 1.5rem;"></div>
            <div class="skeleton skeleton-text" style="width: 100%; height: 2.5rem; margin-bottom: 1.5rem;"></div>
            <div class="skeleton skeleton-text" style="width: 30%; height: 2.5rem;"></div>
        </div>
    }
    else
    {
        <div class="glass-card animate-slide-up" style="max-width: 640px;">
            <EditForm Model="@model" OnValidSubmit="HandleSubmit">
                <div class="gm-form-group">
                    <label class="gm-form-label">Название игры</label>
                    <InputText @bind-Value="model.Title" class="gm-form-control" placeholder="например, D&D 5e: Dragon's Hoard" />
                    <div class="gm-form-hint">Изменение этого поля обновит все сессии в одной группе.</div>
                </div>

                <div class="gm-form-group">
                    <label class="gm-form-label">Запланированное время (МСК, UTC+3)</label>
                    <input type="datetime-local" @bind="model.ScheduledAtLocal" class="gm-form-control" />
                    <div class="gm-form-hint">Текущее: @session.ScheduledAt.FormatMoscow()</div>
                </div>

                <div class="gm-form-group">
                    <label class="gm-form-label">Ссылка для подключения</label>
                    <InputText @bind-Value="model.JoinLink" class="gm-form-control" placeholder="Ссылка на Discord или VTT" />
                </div>

                <div style="display: flex; gap: 0.75rem; margin-top: 1.5rem;">
                    <button type="submit" class="btn-gm btn-gm-success" disabled="@isSubmitting">
                        @(isSubmitting ? "⏳ Сохранение..." : "✅ Сохранить изменения")
                    </button>
                    <button type="button" class="btn-gm btn-gm-outline" @onclick="GoBack">
                        Отмена
                    </button>
                </div>
            </EditForm>
        </div>

        @if (!string.IsNullOrEmpty(errorMessage))
        {
            <div class="gm-alert gm-alert-danger" style="margin-top: 1rem; max-width: 640px;">
                ⚠️ @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 = "Не удалось сохранить изменения: " + 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; } = "";
    }
}