ANTOOZA-BACKEND/Admin/Pages/Channel/List/View.cshtml.cs

using Application.Abstractions.YouTube;
using SharedKernel.Extensions;
using MediatR;
using Microsoft.AspNetCore.Mvc.RazorPages;

namespace Admin.Pages.Channel.List;

public class ViewModel(IMediator mediator, IYouTubeApiService youTubeApi, IYouTubeLiveStateStore liveStateStore, IYouTubeChannelCache channelCache) : PageModel
{
    // ── DB 데이터 ────────────────────────────────────────────────
    public int ID { get; set; }
    public int MemberID { get; set; }
    public string? MemberInfo { get; set; }
    public string SID { get; set; } = default!;
    public string Name { get; set; } = default!;
    public string? Handle { get; set; }
    public string YouTubeUrl { get; set; } = default!;
    public decimal PlatformFeeRate { get; set; }
    public bool IsVerified { get; set; }
    public bool IsActive { get; set; }
    public string? UpdatedAt { get; set; }
    public string CreatedAt { get; set; } = default!;

    // ── YouTube API 데이터 ───────────────────────────────────────
    public YouTubeChannelInfo? YouTubeChannel { get; set; }
    public bool YouTubeApiFailed { get; set; }
    public string? YouTubeApiError { get; set; }

    // ── 라이브 상태 (PubSub 기반 — Redis 조회만, API 호출 없음) ──
    public YouTubeLiveStreamInfo? LiveStream { get; set; }

    public async Task OnGetAsync(int id, CancellationToken ct)
    {
        var result = await mediator.Send(new GetChannel.Query(id), ct);
        if (result is null)
        {
            return;
        }

        ID = result.ID;
        MemberID = result.MemberID;
        MemberInfo = $"[{result.MemberID}] {result.MemberEmail}, {result.MemberName ?? result.MemberSID ?? "-"}";
        SID = result.SID;
        Name = result.Name;
        Handle = result.Handle;
        YouTubeUrl = result.YouTubeUrl;
        PlatformFeeRate = result.PlatformFeeRate;
        IsVerified = result.IsVerified;
        IsActive = result.IsActive;
        UpdatedAt = result.UpdatedAt.GetDateAt();
        CreatedAt = result.CreatedAt.GetDateAt();

        // SID = YouTube 채널 ID → 채널 정보 조회 (1 unit)
        await FetchYouTubeChannelAsync(result.SID, ct);

        // 라이브 상태는 Redis에서만 조회 (API 호출 없음, 0 unit)
        LiveStream = await liveStateStore.GetLiveAsync(result.SID);
    }

    private async Task FetchYouTubeChannelAsync(string channelId, CancellationToken ct)
    {
        try
        {
            YouTubeChannel = await youTubeApi.GetChannelByIdAsync(channelId, ct);

            // YouTube API 조회 성공 시 Redis 캐시에 저장 (24시간 TTL)
            if (YouTubeChannel is not null)
            {
                await channelCache.SetAsync(YouTubeChannel);
            }

            if (YouTubeChannel is null)
            {
                YouTubeApiFailed = true;
                YouTubeApiError = $"채널 정보를 찾을 수 없습니다. 조회한 SID: \"{channelId}\" — DB Config의 YouTube API Key 설정을 확인하세요.";
            }
        }
        catch (Exception ex)
        {
            YouTubeApiFailed = true;
            YouTubeApiError = $"YouTube API 조회 실패: {ex.Message}";
        }
    }
}