using Application.Abstractions.Data;
using Application.Helpers;
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>
/// 거시·환율 수집 (한국수출입은행 OpenAPI) — AP01 현재환율 + AP02 대출금리 + AP03 국제금리. 기본 11:30 KST 실행
/// (koreaexim 은 영업일 ~11시 이후 반영). 공용 KrxBackfill 로 [today-MacroBackfillDays, 직전 영업일] 을 최신일부터 과거로 훑으며
/// 미적재일만 채운다 — quota 보호를 위해 1회 실행당 BackfillMaxPerRun(기본 60)일까지만 fetch. 각 날짜는 세 data 종류를
/// (키가 설정된 것만) 모두 수집해 ExchangeRate / InterestRate upsert (UQ = (CurrencyUnit,TradeDate) / (RateType,ItemName,TradeDate)).
/// 빈 배열([]) — 주말/공휴일·오전 미반영 — 은 "데이터 없음" 으로 취급(그 날은 미적재 유지, 다음 실행 때 재시도). 키 전부 미설정 시 skip.
/// existsForDate 판정은 세 종류 중 하나라도 그 날짜에 적재됐는지로 본다 (부분 성공 후 재실행 시 남은 종류를 다시 채울 수 있게 upsert 로 안전).
/// </summary>
internal sealed class MacroDataSyncService(
    IServiceScopeFactory scopeFactory,
    IHttpClientFactory httpClientFactory,
    IOptions<AppSettings> settings,
    ILogger<MacroDataSyncService> logger
) : DailyScheduledService(logger)
{
    protected override string JobName => "MacroDataSync";

    protected override TimeOnly TargetTime => ParseTime(settings.Value.KoreaExim.MacroSyncTime, new TimeOnly(11, 30));

    protected override int MaxRetryCount => 2;

    protected override TimeSpan RetryDelay => TimeSpan.FromHours(1);

    protected override async Task<bool> RunOnceAsync(DateOnly todayKst, CancellationToken ct)
    {
        var cfg = settings.Value.KoreaExim;

        var hasExchange = !string.IsNullOrWhiteSpace(cfg.ExchangeKey);
        var hasLoan = !string.IsNullOrWhiteSpace(cfg.LoanRateKey);
        var hasIntl = !string.IsNullOrWhiteSpace(cfg.IntlRateKey);

        if (!hasExchange && !hasLoan && !hasIntl)
        {
            Logger.LogWarning("[{Job}] KoreaExim 키(ExchangeKey/LoanRateKey/IntlRateKey) 전부 미설정 — 수집 skip", JobName);
            return true;
        }

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

        var endDate = await MarketCalendar.GetPreviousBusinessDayAsync(db, todayKst.AddDays(1), ct);
        var days = cfg.MacroBackfillDays > 0 ? cfg.MacroBackfillDays : 30;
        var startDate = todayKst.AddDays(-days);

        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 baseUrl = cfg.BaseUrl.TrimEnd('/');

        var fetched = await KrxBackfill.RunAsync(
            existsForDate: (day, token) => ExistsForDateAsync(db, day, hasExchange, token),
            fetchAndUpsertForDate: (day, token) => FetchAndUpsertAsync(db, client, baseUrl, cfg, hasExchange, hasLoan, hasIntl, 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);

        return true;
    }

    /// <summary>해당 날짜 적재 여부 — 환율 키가 있으면 ExchangeRate, 없으면 InterestRate 로 판정</summary>
    private static async Task<bool> ExistsForDateAsync(IAppDbContext db, DateOnly day, bool hasExchange, CancellationToken ct)
    {
        if (hasExchange)
        {
            return await db.ExchangeRate.AsNoTracking().AnyAsync(c => c.TradeDate == day, ct);
        }

        return await db.InterestRate.AsNoTracking().AnyAsync(c => c.TradeDate == day, ct);
    }

    private async Task FetchAndUpsertAsync(
        IAppDbContext db,
        HttpClient client,
        string baseUrl,
        AppSettings.KoreaEximSection cfg,
        bool hasExchange,
        bool hasLoan,
        bool hasIntl,
        DateOnly day,
        CancellationToken ct
    ) {
        var touched = 0;

        if (hasExchange)
        {
            touched += await FetchExchangeAsync(db, client, baseUrl, cfg.ExchangeKey, day, ct);
        }

        if (hasLoan)
        {
            touched += await FetchRateAsync(db, client, baseUrl, cfg.LoanRateKey, "AP02", RateType.Loan, day, ct);
        }

        if (hasIntl)
        {
            touched += await FetchRateAsync(db, client, baseUrl, cfg.IntlRateKey, "AP03", RateType.International, day, ct);
        }

        if (touched > 0)
        {
            await db.SaveChangesAsync(ct);
        }
        else
        {
            Logger.LogInformation("[{Job}] searchdate={Day} 거시 미반영 (0건)", JobName, day);
        }
    }

    /// <summary>AP01 환율 수집 + upsert. 반환값 = 이번 호출로 add/update 한 행 수.</summary>
    private async Task<int> FetchExchangeAsync(IAppDbContext db, HttpClient client, string baseUrl, string authKey, DateOnly day, CancellationToken ct)
    {
        var url = $"{baseUrl}?authkey={authKey}&searchdate={day:yyyyMMdd}&data=AP01";
        var json = await KoreaEximHttp.GetStringWithRetryAsync(client, url, Logger, ct);
        var parsed = KoreaEximExchangeParser.Parse(json);

        Logger.LogInformation("[{Job}] AP01 환율 searchdate={Day} rows={Rows}", JobName, day, parsed.Count);

        if (parsed.Count == 0)
        {
            return 0;
        }

        var existing = await db.ExchangeRate.Where(c => c.TradeDate == day).ToListAsync(ct);
        var existingByUnit = existing.ToDictionary(c => c.CurrencyUnit);
        var count = 0;

        foreach (var row in parsed)
        {
            if (existingByUnit.TryGetValue(row.CurrencyUnit, out var rate))
            {
                rate.Update(row.CurrencyName, row.DealBasRate, row.Ttb, row.Tts);
            }
            else
            {
                var created = ExchangeRate.Create(row.CurrencyUnit, row.CurrencyName, day, row.DealBasRate, row.Ttb, row.Tts);
                await db.ExchangeRate.AddAsync(created, ct);
                existingByUnit[row.CurrencyUnit] = created;
            }

            count++;
        }

        return count;
    }

    /// <summary>AP02/AP03 금리 수집 + upsert. 반환값 = 이번 호출로 add/update 한 행 수.</summary>
    private async Task<int> FetchRateAsync(IAppDbContext db, HttpClient client, string baseUrl, string authKey, string data, RateType rateType, DateOnly day, CancellationToken ct)
    {
        var url = $"{baseUrl}?authkey={authKey}&searchdate={day:yyyyMMdd}&data={data}";
        var json = await KoreaEximHttp.GetStringWithRetryAsync(client, url, Logger, ct);
        var parsed = KoreaEximRateParser.Parse(json);

        Logger.LogInformation("[{Job}] {Data} {Type} searchdate={Day} rows={Rows}", JobName, data, rateType, day, parsed.Count);

        if (parsed.Count == 0)
        {
            return 0;
        }

        var existing = await db.InterestRate.Where(c => c.RateType == rateType && c.TradeDate == day).ToListAsync(ct);
        var existingByName = existing.ToDictionary(c => c.ItemName);
        var count = 0;

        foreach (var row in parsed)
        {
            if (existingByName.TryGetValue(row.ItemName, out var rate))
            {
                rate.Update(row.Rate);
            }
            else
            {
                var created = InterestRate.Create(rateType, row.ItemName, day, row.Rate);
                await db.InterestRate.AddAsync(created, ct);
                existingByName[row.ItemName] = created;
            }

            count++;
        }

        return count;
    }
}