namespace Admin.NET.Plugin.AiDOP.DataPlatform;

/// <summary>
/// 岗位原文 → 中立岗位码。精确值优先于关键字。
/// S3/S5/S6/S7 人效分母按 PLANNER/WAREHOUSE/PRODUCTION 逐个过滤，故 OTHER 与 UNKNOWN 均不进分母；
/// 两者的差别只在运维可见性：UNKNOWN 会记 POSITION_UNMAPPED 并进待映射清单，OTHER 不会。
/// </summary>
public static class EmployeePositionRules
{
    public const string Warehouse = "WAREHOUSE";
    public const string Production = "PRODUCTION";
    public const string Planner = "PLANNER";
    public const string Other = "OTHER";
    public const string Unknown = "UNKNOWN";

    /// <summary>人工映射允许写入的岗位码全集。前端下拉选项必须与本数组一致，由守卫测试钉住。</summary>
    public static readonly string[] AllowedCodes = [Warehouse, Production, Planner, Other, Unknown];

    public static readonly string[] WarehouseKeywords = ["仓", "库管", "保管", "物料员", "WMS", "warehouse", "storekeeper"];
    public static readonly string[] ProductionKeywords = ["生产", "操作", "装配", "车间", "班组", "产线", "工段", "production", "assembly", "operator", "workshop"];
    public static readonly string[] PlannerKeywords = ["计划", "PMC", "调度", "planner", "planning", "scheduler"];

    /// <summary>已确认不属于仓管/生产/计划的岗位，归 OTHER 后不再记 POSITION_UNMAPPED 告警。</summary>
    public static readonly string[] OtherKeywords = ["quality", "质量", "QC", "QA", "数据员", "研发"];

    /// <summary>T8 gw 原值精确匹配，优先于关键字。</summary>
    public static readonly IReadOnlyDictionary<string, string> Exact = new Dictionary<string, string>(StringComparer.Ordinal)
    {
        ["计划"] = Planner,
        ["仓管"] = Warehouse,
        ["生产"] = Production
    };

    public static string Classify(string? raw)
    {
        if (string.IsNullOrWhiteSpace(raw))
            return Unknown;
        var text = raw.Trim();
        if (Exact.TryGetValue(text, out var exact))
            return exact;
        if (Matches(text, WarehouseKeywords))
            return Warehouse;
        if (Matches(text, ProductionKeywords))
            return Production;
        if (Matches(text, PlannerKeywords))
            return Planner;
        // OTHER 放在三类业务岗之后：岗位原文同时含「质量」与「仓」时仍归 WAREHOUSE。
        if (Matches(text, OtherKeywords))
            return Other;
        return Unknown;
    }

    /// <summary>
    /// 规范化人工传入的岗位码：命中返回标准大写值，非法返回 null。
    /// MySQL 默认排序规则不区分大小写，直接存小写会绕过校验却与 KPI 的等值过滤"看起来"仍匹配，故一律归一化再入库。
    /// </summary>
    public static string? Normalize(string? code)
    {
        if (string.IsNullOrWhiteSpace(code))
            return null;
        var text = code.Trim();
        return AllowedCodes.FirstOrDefault(allowed => string.Equals(allowed, text, StringComparison.OrdinalIgnoreCase));
    }

    // 岗位原文的大小写不由平台控制（165 的 JobTitle 是小写英文，T8 的 gw 是中文），统一忽略大小写比对。
    private static bool Matches(string text, string[] keywords)
        => keywords.Any(keyword => text.Contains(keyword, StringComparison.OrdinalIgnoreCase));
}