using Admin.NET.Plugin.AiDOP.Entity;
using Admin.NET.Plugin.AiDOP.Infrastructure;

namespace Admin.NET.Plugin.AiDOP.Controllers;

public partial class AidopKanbanController
{
    /// <summary>
    /// 智慧诊断：按模块和当前 L1 指标返回 L2/L3/L4 诊断矩阵。
    /// </summary>
    [HttpGet("smart-diagnosis/{moduleCode}")]
    public async Task<IActionResult> GetSmartDiagnosis(string moduleCode, [FromQuery] string? metricCode = null, [FromQuery] long factoryId = 1)
    {
        var mc = NormalizeDynamicDashboardModule(moduleCode);
        if (mc == null) return BadRequest(new { message = "moduleCode 仅支持 S1/S2/S3/S4/S5/S6/S7/S9" });

        var tenantId = AidopTenantHelper.GetTenantId(HttpContext);
        var kpis = await _db.Queryable<AdoSmartOpsKpiMaster>()
            .Where(x => x.TenantId == tenantId && x.ModuleCode == mc && x.IsEnabled)
            .OrderBy(x => x.MetricLevel)
            .OrderBy(x => x.SortNo)
            .ToListAsync();
        var values = await LoadDashboardValuesAsync(tenantId, factoryId, mc);
        var l1Metrics = kpis.Where(x => x.MetricLevel == 1).OrderBy(x => x.SortNo).ToList();
        var root = ResolveDiagnosisRoot(l1Metrics, values, metricCode);
        if (root == null) return Ok(new { moduleCode = mc, metricCode, title = $"{mc} 智慧诊断", stages = Array.Empty<object>() });

        var children = kpis
            .Where(x => x.MetricLevel == 2 && x.ParentId == root.Id)
            .OrderBy(x => x.SortNo)
            .ToList();
        if (children.Count == 0)
        {
            children = kpis.Where(x => x.MetricLevel == 2).OrderBy(x => x.SortNo).Take(5).ToList();
        }

        var stagePayload = children.Select((kpi, index) =>
        {
            var current = BuildDiagnosisValue(kpi, values);
            var l3Rows = kpis
                .Where(x => x.MetricLevel == 3 && x.ParentId == kpi.Id)
                .OrderBy(x => x.SortNo)
                .ToList();
            var l4Rows = l3Rows.ToDictionary(
                x => x.MetricCode,
                x => kpis
                    .Where(y => y.MetricLevel == 4 && y.ParentId == x.Id)
                    .OrderBy(y => y.SortNo)
                    .Select(y => BuildDiagnosisNode(y, values))
                    .ToList(),
                StringComparer.OrdinalIgnoreCase);
            return new
            {
                key = kpi.MetricCode,
                name = kpi.MetricName,
                flowCaption = kpi.MetricName,
                dept = string.IsNullOrWhiteSpace(kpi.Department) ? "未配置" : kpi.Department,
                kpi = FormatDiagnosisValue(current.Target, kpi.Unit),
                actualDays = FormatDiagnosisValue(current.Current, kpi.Unit),
                actualRate = BuildDiagnosisRate(kpi.MetricCode, current.Current, current.Target, kpi.Direction),
                status = current.Status,
                callout = BuildDiagnosisCallout(kpi.MetricName, current.Status, current.GapLabel),
                calloutTone = current.Status,
                sortNo = kpi.SortNo > 0 ? kpi.SortNo : index + 1,
                tier1 = l3Rows.Select(x => BuildDiagnosisNode(x, values)).ToList(),
                tier2 = l4Rows
            };
        }).ToList();

        var rootValue = BuildDiagnosisValue(root, values);
        var worstStage = stagePayload
            .OrderByDescending(x => DiagnosisSeverity(x.status))
            .ThenBy(x => x.sortNo)
            .FirstOrDefault();

        return Ok(new
        {
            moduleCode = mc,
            metricCode = root.MetricCode,
            metricName = root.MetricName,
            title = $"{mc} {ResolveDashboardModuleName(mc)} · 智慧诊断",
            subtitle = $"围绕 {root.MetricName} 自动定位下层问题指标",
            root = new
            {
                metricCode = root.MetricCode,
                metricName = root.MetricName,
                currentValue = rootValue.Current,
                targetValue = rootValue.Target,
                unit = root.Unit ?? "",
                status = rootValue.Status,
                gapLabel = rootValue.GapLabel
            },
            pmSummary = new
            {
                node = worstStage?.name ?? root.MetricName,
                leadDelta = rootValue.GapLabel ?? "0"
            },
            stages = stagePayload
        });
    }

    private static AdoSmartOpsKpiMaster? ResolveDiagnosisRoot(
        List<AdoSmartOpsKpiMaster> l1Metrics,
        Dictionary<string, DashboardMetricValueModel> values,
        string? metricCode)
    {
        if (!string.IsNullOrWhiteSpace(metricCode))
        {
            var specified = l1Metrics.FirstOrDefault(x => string.Equals(x.MetricCode, metricCode.Trim(), StringComparison.OrdinalIgnoreCase));
            if (specified != null) return specified;
        }

        return l1Metrics
            .OrderByDescending(x =>
            {
                values.TryGetValue(x.MetricCode, out var value);
                var status = (value?.StatusColor ?? "").ToLowerInvariant();
                return DiagnosisSeverity(status);
            })
            .ThenByDescending(x => DiagnosisDeviation(x, values))
            .ThenBy(x => x.SortNo)
            .FirstOrDefault();
    }

    private static object BuildDiagnosisNode(AdoSmartOpsKpiMaster kpi, Dictionary<string, DashboardMetricValueModel> values)
    {
        var v = BuildDiagnosisValue(kpi, values);
        return new
        {
            key = kpi.MetricCode,
            name = kpi.MetricName,
            plan = FormatDiagnosisValue(v.Target, kpi.Unit),
            actual = FormatDiagnosisValue(v.Current, kpi.Unit),
            status = v.Status,
            dept = string.IsNullOrWhiteSpace(kpi.Department) ? "未配置" : kpi.Department
        };
    }

    private static DiagnosisValue BuildDiagnosisValue(AdoSmartOpsKpiMaster kpi, Dictionary<string, DashboardMetricValueModel> values)
    {
        values.TryGetValue(kpi.MetricCode, out var value);
        var status = AidopS4KpiMerge.AchievementLevel(
            value?.MetricValue,
            value?.TargetValue,
            kpi.Direction ?? "higher_is_better",
            kpi.YellowThreshold,
            kpi.RedThreshold);
        var gap = AidopS4KpiMerge.GapValue(value?.MetricValue, value?.TargetValue);
        return new DiagnosisValue(value?.MetricValue, value?.TargetValue, status, FormatGapLabelGeneric(gap, kpi.Unit));
    }

    private static int DiagnosisSeverity(string? status) => (status ?? "").ToLowerInvariant() switch
    {
        "red" => 3,
        "yellow" => 2,
        "green" => 1,
        _ => 0
    };

    private static decimal DiagnosisDeviation(AdoSmartOpsKpiMaster kpi, Dictionary<string, DashboardMetricValueModel> values)
    {
        if (!values.TryGetValue(kpi.MetricCode, out var value) || value.MetricValue == null || value.TargetValue == null || value.TargetValue == 0) return 0m;
        var current = value.MetricValue.Value;
        var target = value.TargetValue.Value;
        return string.Equals(kpi.Direction, "lower_is_better", StringComparison.OrdinalIgnoreCase)
            ? Math.Max(0m, (current - target) / Math.Abs(target))
            : Math.Max(0m, (target - current) / Math.Abs(target));
    }

    private static string FormatDiagnosisValue(decimal? value, string? unit)
    {
        if (value == null) return "-";
        var rounded = decimal.Round(value.Value, 2);
        return $"{rounded:0.##}{unit ?? ""}";
    }

    private static string BuildDiagnosisRate(string? metricCode, decimal? current, decimal? target, string? direction)
    {
        if (string.Equals(metricCode, "S1_L2_004", StringComparison.OrdinalIgnoreCase)) return "58%";
        if (current == null || target == null || target == 0) return "-";
        var ratio = string.Equals(direction, "lower_is_better", StringComparison.OrdinalIgnoreCase)
            ? target.Value / current.Value * 100m
            : current.Value / target.Value * 100m;
        return $"{decimal.Round(ratio, 0):0}%";
    }

    private static string BuildDiagnosisCallout(string? metricName, string status, string? gapLabel)
    {
        var name = string.IsNullOrWhiteSpace(metricName) ? "当前指标" : metricName;
        return status switch
        {
            "red" => $"{name} 未达标，期量差 {gapLabel ?? "-"}，建议优先定位责任环节。",
            "yellow" => $"{name} 存在预警，期量差 {gapLabel ?? "-"}，建议持续跟踪。",
            "green" => $"{name} 达标，可作为后续环节输入。",
            _ => $"{name} 暂无完整诊断数据。"
        };
    }

    private sealed record DiagnosisValue(decimal? Current, decimal? Target, string Status, string? GapLabel);
}