using Admin.NET.Plugin.AiDOP.Entity;
using Microsoft.Extensions.Logging;

namespace Admin.NET.Plugin.AiDOP.SmartOps;

public sealed class KpiTargetResolver : IKpiTargetResolver, ITransient
{
    private readonly IKpiTargetConfigStore _store;
    private readonly ILegacyKpiTargetProvider _legacy;
    private readonly ILogger<KpiTargetResolver> _logger;

    public KpiTargetResolver(
        IKpiTargetConfigStore store,
        ILegacyKpiTargetProvider legacy,
        ILogger<KpiTargetResolver> logger)
    {
        _store = store;
        _legacy = legacy;
        _logger = logger;
    }

    public async Task<KpiTargetSnapshot> ResolveAsync(
        long tenantId,
        long factoryId,
        string metricCode,
        string moduleCode,
        DateTime bizDate,
        CancellationToken ct = default)
    {
        var day = bizDate.Date;
        var now = DateTime.Now;

        var factoryHits = KpiTargetRules.ActiveOn(
            await _store.ListActiveScopeAsync(tenantId, factoryId, metricCode, ct),
            day);
        if (factoryHits.Count > 0)
        {
            var cfg = KpiTargetRules.PickSingle(factoryHits, $"工厂 {factoryId}/{metricCode}/{day:yyyy-MM-dd}");
            return Formal(cfg, KpiTargetSnapshotSource.FormalFactory, now);
        }

        if (factoryId != 0)
        {
            var tenantHits = KpiTargetRules.ActiveOn(
                await _store.ListActiveScopeAsync(tenantId, 0, metricCode, ct),
                day);
            if (tenantHits.Count > 0)
            {
                var cfg = KpiTargetRules.PickSingle(tenantHits, $"租户默认 {metricCode}/{day:yyyy-MM-dd}");
                return Formal(cfg, KpiTargetSnapshotSource.FormalTenantDefault, now);
            }
        }

        var legacy = await _legacy.TryResolveLegacyAsync(tenantId, factoryId, metricCode, moduleCode, day, ct);
        if (legacy != null && legacy.TargetValue is > 0)
        {
            _logger.LogWarning(
                "KPI 目标走兼容来源 {Source} tenant={TenantId} factory={FactoryId} metric={MetricCode} date={BizDate} value={Value}",
                legacy.TargetSource, tenantId, factoryId, metricCode, day, legacy.TargetValue);
            return legacy;
        }

        _logger.LogInformation(
            "KPI 目标缺失 tenant={TenantId} factory={FactoryId} metric={MetricCode} date={BizDate}",
            tenantId, factoryId, metricCode, day);
        return new KpiTargetSnapshot(null, null, KpiTargetSnapshotSource.Missing, now);
    }

    private static KpiTargetSnapshot Formal(AdoSmartOpsKpiTargetConfig cfg, string source, DateTime now) =>
        new(
            cfg.TargetValue,
            cfg.Id,
            source,
            now,
            DateOnly.FromDateTime(cfg.EffectiveFrom.Date),
            cfg.EffectiveTo.HasValue ? DateOnly.FromDateTime(cfg.EffectiveTo.Value.Date) : null);
}