using Microsoft.Extensions.Logging;

namespace Admin.NET.Plugin.AiDOP.SmartOps;

public sealed class LegacyKpiTargetProvider : ILegacyKpiTargetProvider, ITransient
{
    private static readonly HashSet<string> LegacyModules = new(StringComparer.OrdinalIgnoreCase) { "S1", "S2", "S3", "S4" };

    private readonly IKpiDailyTargetReader _daily;
    private readonly ILogger<LegacyKpiTargetProvider> _logger;

    public LegacyKpiTargetProvider(IKpiDailyTargetReader daily, ILogger<LegacyKpiTargetProvider> logger)
    {
        _daily = daily;
        _logger = logger;
    }

    public async Task<KpiTargetSnapshot?> TryResolveLegacyAsync(
        long tenantId,
        long factoryId,
        string metricCode,
        string moduleCode,
        DateTime bizDate,
        CancellationToken ct = default)
    {
        if (!LegacyModules.Contains(moduleCode ?? string.Empty))
            return null;

        var now = DateTime.Now;
        var current = await _daily.GetCurrentTargetAsync(tenantId, factoryId, moduleCode, metricCode, bizDate.Date, ct);
        if (current is > 0)
        {
            _logger.LogWarning("KPI 兼容命中当天日值 tenant={Tenant} metric={Metric} value={Value}", tenantId, metricCode, current);
            return new KpiTargetSnapshot(current, null, KpiTargetSnapshotSource.LegacyDailyCurrent, now);
        }

        var prior = await _daily.GetPriorTargetAsync(tenantId, factoryId, moduleCode, metricCode, bizDate.Date, ct);
        if (prior is > 0)
        {
            _logger.LogWarning("KPI 兼容命中历史日值 tenant={Tenant} metric={Metric} value={Value}", tenantId, metricCode, prior);
            return new KpiTargetSnapshot(prior, null, KpiTargetSnapshotSource.LegacyDailyPrior, now);
        }

        if (LegacyKpiCodeTargets.TryGet(metricCode, out var codeTarget))
        {
            _logger.LogWarning("KPI 兼容命中代码默认 tenant={Tenant} metric={Metric} value={Value}", tenantId, metricCode, codeTarget);
            return new KpiTargetSnapshot(codeTarget, null, KpiTargetSnapshotSource.LegacyCode, now);
        }

        return null;
    }
}