using Application.Abstractions.Data;
using Application.Helpers;
using Domain.Entities.Stocks;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using SharedKernel;

namespace Infrastructure.StockData;

/// <summary>
/// 채권지수 일별시세 수집 — KRX OpenAPI (idx/bon_dd_trd, AUTH_KEY 헤더).
/// 응답 shape(총수익·순가격·재투자·시장가격 지수 + 듀레이션·컨벡시티·YTM)이 주식/파생 지수와 달라 IndexPriceSyncService 와 분리한다.
/// 기본 18:35 KST 실행(지수 수집 18:30 뒤). 공용 KrxBackfill 로 최근 BackfillYears(기본 3)년치를 endDate(직전 영업일)부터
/// 과거로 훑으며 미적재일만 채운다. quota 보호를 위해 1회 실행당 BackfillMaxPerRun(기본 60)일까지만 fetch →
/// 여러 날에 걸쳐 3년치를 메우고 이후엔 최신만 유지한다. 각 날짜는 1개 엔드포인트를 수집해 BondIndexDailyPrice upsert
/// (UQ = GroupName+TradeDate). ApiKey 미설정 시 로그만 남기고 skip (다른 KRX 배치와 동일 정책).
/// </summary>
internal sealed class BondIndexPriceSyncService(
    IServiceScopeFactory scopeFactory,
    IHttpClientFactory httpClientFactory,
    IOptions<AppSettings> settings,
    ILogger<BondIndexPriceSyncService> logger
) : DailyScheduledService(logger)
{
    private const string EndpointPath = "/svc/apis/idx/bon_dd_trd";

    protected override string JobName => "BondIndexPriceSync";

    protected override TimeOnly TargetTime => ParseTime(settings.Value.KRXCoKr.BondIndexSyncTime, new TimeOnly(18, 35));

    protected override int MaxRetryCount => 2;

    protected override TimeSpan RetryDelay => TimeSpan.FromHours(2);

    protected override async Task<bool> RunOnceAsync(DateOnly todayKst, CancellationToken ct)
    {
        var cfg = settings.Value.KRXCoKr;
        if (string.IsNullOrWhiteSpace(cfg.ApiKey))
        {
            Logger.LogWarning("[{Job}] KRXCoKr:ApiKey 미설정 — 수집 skip", JobName);
            return true;
        }

        using var scope = scopeFactory.CreateScope();
        var db = scope.ServiceProvider.GetRequiredService<IAppDbContext>();
        var client = httpClientFactory.CreateClient(KrxCoKrHttp.ClientName);

        var endDate = await MarketCalendar.GetPreviousBusinessDayAsync(db, todayKst.AddDays(1), ct);
        var years = cfg.BackfillYears > 0 ? cfg.BackfillYears : 3;
        var startDate = todayKst.AddYears(-years);

        // 백필 창 전체의 휴장일을 한 번에 로드 (KrxBackfill 은 주말은 자동 제외, 휴장일만 필요)
        var holidays = (await db.MarketHoliday.AsNoTracking()
            .Where(c => c.Date >= startDate && c.Date <= endDate)
            .Select(c => c.Date)
            .ToListAsync(ct)).ToHashSet();

        var maxPerRun = cfg.BackfillMaxPerRun > 0 ? cfg.BackfillMaxPerRun : 60;

        var fetched = await KrxBackfill.RunAsync(
            existsForDate: (day, token) => db.BondIndexDailyPrice.AsNoTracking().AnyAsync(c => c.TradeDate == day, token),
            fetchAndUpsertForDate: (day, token) => FetchAndUpsertAsync(db, client, cfg.BaseUrl, cfg.ApiKey, day, token),
            startDate: startDate,
            endDate: endDate,
            holidays: holidays,
            maxPerRun: maxPerRun,
            delayMs: 300,
            ct: ct);

        Logger.LogInformation("[{Job}] 완료 — 창=[{Start}~{End}], 이번 실행 fetch={Fetched}일 (maxPerRun={Max})",
            JobName, startDate, endDate, fetched, maxPerRun);

        // fetch 가 0 이어도(이미 최신까지 적재됨) 정상 완료 — 재시도 불필요
        return true;
    }

    /// <summary>한 날짜에 대해 채권지수 엔드포인트를 수집하고 BondIndexDailyPrice upsert.</summary>
    private async Task FetchAndUpsertAsync(IAppDbContext db, HttpClient client, string baseUrl, string apiKey, DateOnly day, CancellationToken ct)
    {
        var url = $"{baseUrl.TrimEnd('/')}{EndpointPath}?basDd={day:yyyyMMdd}";
        var json = await KrxCoKrHttp.GetStringWithRetryAsync(client, url, apiKey, Logger, ct);
        var rows = KrxBondIndexParser.ParseBondIndexPrices(json);

        Logger.LogInformation("[{Job}] basDd={Day} rows={Rows}", JobName, day, rows.Count);

        if (rows.Count == 0)
        {
            Logger.LogInformation("[{Job}] basDd={Day} 채권지수 미반영 (0건)", JobName, day);
            return;
        }

        var existing = await db.BondIndexDailyPrice.Where(c => c.TradeDate == day).ToListAsync(ct);
        var existingByKey = existing.ToDictionary(c => c.GroupName);
        var inserted = 0;
        var updated = 0;

        foreach (var row in rows)
        {
            if (existingByKey.TryGetValue(row.GroupName, out var price))
            {
                price.Update(row.TotalEarningIndex, row.TotalEarningChange, row.NetPriceIndex, row.NetPriceChange, row.ZeroReinvestIndex, row.ZeroReinvestChange, row.CallReinvestIndex, row.CallReinvestChange, row.MarketPriceIndex, row.MarketPriceChange, row.AvgDuration, row.AvgConvexity, row.AvgYield);
                updated++;
            }
            else
            {
                var created = BondIndexDailyPrice.Create(row.GroupName, row.TradeDate, row.TotalEarningIndex, row.TotalEarningChange, row.NetPriceIndex, row.NetPriceChange, row.ZeroReinvestIndex, row.ZeroReinvestChange, row.CallReinvestIndex, row.CallReinvestChange, row.MarketPriceIndex, row.MarketPriceChange, row.AvgDuration, row.AvgConvexity, row.AvgYield);
                await db.BondIndexDailyPrice.AddAsync(created, ct);
                existingByKey[row.GroupName] = created;
                inserted++;
            }
        }

        await db.SaveChangesAsync(ct);

        Logger.LogInformation("[{Job}] basDd={Day} 적재 — rows={Rows}, inserted={Inserted}, updated={Updated}",
            JobName, day, rows.Count, inserted, updated);
    }
}