using System.Text.Json;
using Admin.NET.Plugin.AiDOP.Entity.S8;
using Admin.NET.Plugin.AiDOP.Service.S8.Rules;

namespace Admin.NET.Plugin.AiDOP.Service.S8;

public class S8WatchRuleService : ITransient
{
    private readonly SqlSugarRepository<AdoS8WatchRule> _rep;
    private readonly SqlSugarRepository<AdoS8DataSource> _dataSourceRep;
    private readonly SqlSugarRepository<AdoS8SceneConfig> _sceneRep;

    public S8WatchRuleService(
        SqlSugarRepository<AdoS8WatchRule> rep,
        SqlSugarRepository<AdoS8DataSource> dataSourceRep,
        SqlSugarRepository<AdoS8SceneConfig> sceneRep)
    {
        _rep = rep;
        _dataSourceRep = dataSourceRep;
        _sceneRep = sceneRep;
    }

    public async Task<List<AdoS8WatchRule>> ListAsync(long tenantId, long factoryId) =>
        await _rep.AsQueryable()
            .Where(x => x.TenantId == tenantId && x.FactoryId == factoryId)
            .ToListAsync();

    public async Task<AdoS8WatchRule> CreateAsync(AdoS8WatchRule body)
    {
        await ValidateAsync(body);
        body.Id = 0;
        body.CreatedAt = DateTime.Now;
        await _rep.InsertAsync(body);
        return body;
    }

    public async Task<AdoS8WatchRule> UpdateAsync(long id, AdoS8WatchRule body)
    {
        var e = await _rep.GetByIdAsync(id) ?? throw new S8BizException("记录不存在");
        await ValidateAsync(body, id);
        body.Id = id;
        body.CreatedAt = e.CreatedAt;
        body.UpdatedAt = DateTime.Now;
        await _rep.UpdateAsync(body);
        return body;
    }

    public async Task DeleteAsync(long id) => await _rep.DeleteByIdAsync(id);

    /// <summary>
    /// R4 安全更新：只更新 params_json 与 enabled。expression / rule_code / data_source_id /
    /// scene_code / watch_object_type / rule_type / source_object_type 一律不通过此路径修改。
    /// 当 RuleType 非空时，按对应 evaluator 的 Params.Parse 进行 schema 校验，解析失败抛 S8BizException。
    /// </summary>
    public async Task<AdoS8WatchRule> UpdateParamsAsync(long id, S8WatchRuleParamsPayload payload)
    {
        var entity = await _rep.GetByIdAsync(id) ?? throw new S8BizException("记录不存在");

        var paramsJson = payload.ParamsJson?.Trim();
        if (!string.IsNullOrEmpty(paramsJson))
        {
            ValidateParamsJsonByRuleType(entity.RuleType, paramsJson);
        }

        entity.ParamsJson = string.IsNullOrEmpty(paramsJson) ? null : paramsJson;
        entity.Enabled = payload.Enabled;
        entity.UpdatedAt = DateTime.Now;
        await _rep.UpdateAsync(entity);
        return entity;
    }

    private static void ValidateParamsJsonByRuleType(string? ruleType, string paramsJson)
    {
        try
        {
            switch (ruleType)
            {
                case S8TimeoutRuleEvaluator.RuleTypeCode:
                    {
                        var p = S8TimeoutParams.Parse(paramsJson);
                        if (string.IsNullOrWhiteSpace(p.DueAtField)
                            || string.IsNullOrWhiteSpace(p.StatusField)
                            || string.IsNullOrWhiteSpace(p.ExceptionTypeCode))
                            throw new S8BizException("TIMEOUT params 缺少必填字段：dueAtField / statusField / exceptionTypeCode");
                        break;
                    }
                case S8ShortageRuleEvaluator.RuleTypeCode:
                    {
                        var p = S8ShortageParams.Parse(paramsJson);
                        if (string.IsNullOrWhiteSpace(p.TargetQtyField)
                            || string.IsNullOrWhiteSpace(p.ActualQtyField)
                            || string.IsNullOrWhiteSpace(p.ExceptionTypeCode))
                            throw new S8BizException("SHORTAGE params 缺少必填字段：targetQtyField / actualQtyField / exceptionTypeCode");
                        break;
                    }
                case S8OutOfRangeRuleEvaluator.RuleTypeCode:
                    {
                        var p = S8OutOfRangeParams.Parse(paramsJson);
                        if (string.IsNullOrWhiteSpace(p.MeasuredValueField))
                            throw new S8BizException("OUT_OF_RANGE params 缺少必填字段：measuredValueField");
                        if (p.LowerBound == null && p.UpperBound == null
                            && string.IsNullOrWhiteSpace(p.LowerBoundField)
                            && string.IsNullOrWhiteSpace(p.UpperBoundField))
                            throw new S8BizException("OUT_OF_RANGE params 必须提供 upperBound / lowerBound 或对应行内字段之一");
                        break;
                    }
                default:
                    // RuleType 为空或非三类已知值：仅做 JSON 合法性校验，避免阻塞历史数据。
                    using (JsonDocument.Parse(paramsJson)) { }
                    break;
            }
        }
        catch (JsonException ex)
        {
            throw new S8BizException($"params_json 不是合法 JSON：{ex.Message}");
        }
    }

    public async Task<object> TestAsync(long id)
    {
        var entity = await _rep.GetByIdAsync(id) ?? throw new S8BizException("记录不存在");
        await ValidateAsync(entity, id);
        return new { id, success = true, message = "规则基础校验通过", pollIntervalSeconds = entity.PollIntervalSeconds };
    }

    private async Task ValidateAsync(AdoS8WatchRule body, long? id = null)
    {
        if (string.IsNullOrWhiteSpace(body.RuleCode) || string.IsNullOrWhiteSpace(body.SceneCode))
            throw new S8BizException("规则编码和场景编码必填");

        var exists = await _rep.AsQueryable()
            .AnyAsync(x => x.Id != (id ?? 0) && x.TenantId == body.TenantId && x.FactoryId == body.FactoryId && x.RuleCode == body.RuleCode);
        if (exists) throw new S8BizException("监视规则编码已存在");

        var dataSource = await _dataSourceRep.GetFirstAsync(x => x.Id == body.DataSourceId)
            ?? throw new S8BizException("关联数据源不存在");
        if (!dataSource.Enabled) throw new S8BizException("关联数据源未启用");

        var scene = await _sceneRep.GetFirstAsync(x => x.TenantId == body.TenantId && x.FactoryId == body.FactoryId && x.SceneCode == body.SceneCode)
            ?? throw new S8BizException("关联场景不存在");
        if (!scene.Enabled) throw new S8BizException("关联场景未启用");

        if (body.PollIntervalSeconds <= 0) throw new S8BizException("轮询间隔必须大于 0");
    }
}