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

namespace Infrastructure.StockData;

/// <summary>
/// 종목 마스터 동기화 (KRX OpenAPI) — stk_isu_base_info(KOSPI) + ksq_isu_base_info(KOSDAQ) + knx_isu_base_info(KONEX) 종목기본정보를
/// 일 1회(기본 07:40 KST) 전량 수집하여 Stock upsert. 신규 상장 = insert, 명칭/시장/영문명/업종 변경 = update,
/// 스냅샷에서 사라진 활성 종목 = 상폐 soft-off. ApiKey 미설정 시 로그만 남기고 skip (data.go.kr 배치와 동일 정책).
/// 종목기본정보는 basDd 단위 스냅샷 — 직전 영업일부터 최대 7일 소급하며 데이터가 있는 기준일을 찾는다.
/// KONEX 응답 필드셋은 KOSPI/KOSDAQ 과 동일(ISU_SRT_CD/ISU_CD/ISU_ABBRV/ISU_ENG_NM/LIST_DD/MKT_TP_NM/SECT_TP_NM) — KrxStockParser 재사용.
/// </summary>
internal sealed class KrxStockMasterSyncService(
    IServiceScopeFactory scopeFactory,
    IHttpClientFactory httpClientFactory,
    IOptions<AppSettings> settings,
    ILogger<KrxStockMasterSyncService> logger
) : DailyScheduledService(logger)
{
    // (시장, 엔드포인트 경로) — KOSPI/KOSDAQ/KONEX. 세 시장 모두 Stock 테이블에 Market 으로만 구분되어 적재된다.
    private static readonly (StockMarket Market, string Path)[] Endpoints =
    [
        (StockMarket.KOSPI, "/svc/apis/sto/stk_isu_base_info"),
        (StockMarket.KOSDAQ, "/svc/apis/sto/ksq_isu_base_info"),
        (StockMarket.KONEX, "/svc/apis/sto/knx_isu_base_info")
    ];

    private const int MaxBaseDateLookback = 7;

    protected override string JobName => "KrxStockMasterSync";

    protected override TimeOnly TargetTime => ParseTime(settings.Value.KRXCoKr.MasterSyncTime, new TimeOnly(7, 40));

    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);

        // 종목기본정보는 basDd 단위 스냅샷 — 직전 영업일부터 최대 7일 소급하며 데이터가 있는 기준일을 찾는다
        var baseDate = await MarketCalendar.GetPreviousBusinessDayAsync(db, todayKst.AddDays(1), ct);
        List<KrxStockParser.MasterItem>? snapshot = null;

        for (var back = 0; back < MaxBaseDateLookback; back++)
        {
            snapshot = await FetchSnapshotAsync(client, cfg, baseDate, ct);
            if (snapshot.Count > 0)
            {
                break;
            }

            baseDate = await MarketCalendar.GetPreviousBusinessDayAsync(db, baseDate, ct);
        }

        if (snapshot is null || snapshot.Count == 0)
        {
            Logger.LogError("[{Job}] 종목기본정보 스냅샷 없음 — 최근 {Days}영업일 조회 실패", JobName, MaxBaseDateLookback);
            return true;
        }

        // 동일 코드 중복 행은 마지막 행 우선
        var byCode = new Dictionary<string, KrxStockParser.MasterItem>();
        foreach (var item in snapshot)
        {
            byCode[item.Code] = item;
        }

        var stocks = await db.Stock.ToListAsync(ct);
        var stockByCode = stocks.ToDictionary(c => c.Code);
        var inserted = 0;
        var updated = 0;
        var delisted = 0;

        foreach (var (code, item) in byCode)
        {
            if (stockByCode.TryGetValue(code, out var stock))
            {
                var wasUpdated = stock.UpdatedAt;
                stock.UpdateMaster(item.Name, item.Market, item.Isin, item.EnglishName, item.SectorName);
                if (stock.UpdatedAt != wasUpdated)
                {
                    updated++;
                }
            }
            else
            {
                await db.Stock.AddAsync(Stock.Create(code, item.Name, item.Market, item.ListedDate, item.Isin, englishName: item.EnglishName, sectorName: item.SectorName), ct);
                inserted++;
            }
        }

        // 스냅샷에서 사라진 활성 종목 = 상폐 soft-off
        foreach (var stock in stocks.Where(c => c.IsActive && !byCode.ContainsKey(c.Code)))
        {
            stock.MarkDelisted(baseDate);
            delisted++;
        }

        await db.SaveChangesAsync(ct);

        Logger.LogInformation("[{Job}] 완료 — basDd={BaseDate}, snapshot={Snapshot}, inserted={Inserted}, updated={Updated}, delisted={Delisted}",
            JobName, baseDate, byCode.Count, inserted, updated, delisted);

        return true;
    }

    private async Task<List<KrxStockParser.MasterItem>> FetchSnapshotAsync(HttpClient client, AppSettings.KRXCoKrSection cfg, DateOnly baseDate, CancellationToken ct)
    {
        var all = new List<KrxStockParser.MasterItem>();

        foreach (var (market, path) in Endpoints)
        {
            var url = $"{cfg.BaseUrl.TrimEnd('/')}{path}?basDd={baseDate:yyyyMMdd}";
            var json = await KrxCoKrHttp.GetStringWithRetryAsync(client, url, cfg.ApiKey, Logger, ct);
            var rows = KrxStockParser.ParseMasterInfo(json, market);

            Logger.LogInformation("[{Job}] {Market} basDd={BaseDate} rows={Rows}", JobName, market, baseDate, rows.Count);
            all.AddRange(rows);
        }

        return all;
    }
}