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 };
    }

    // S8-SCHED-FRONTEND-1：远未来手工暂停哨兵值（与 SqlSugar DateTime 兼容；前端按 paused_until > now 判定）。
    private static readonly DateTime ManualPausedSentinel = new(9999, 12, 31, 23, 59, 59);

    /// <summary>
    /// S8-SCHED-FRONTEND-1：调度参数安全更新。仅修改 poll_interval_seconds / trigger_count_required /
    /// recover_count_required；不动 params_json / expression / rule_type / scene_code / data_source_id。
    /// </summary>
    public async Task<AdoS8WatchRule> UpdateScheduleAsync(long id, S8WatchRuleSchedulePayload payload)
    {
        var entity = await _rep.GetByIdAsync(id) ?? throw new S8BizException("记录不存在");

        if (payload.PollIntervalSeconds < 60 || payload.PollIntervalSeconds > 86400)
            throw new S8BizException("poll_interval_seconds 必须在 60–86400 之间");
        if (payload.TriggerCountRequired < 1 || payload.TriggerCountRequired > 10)
            throw new S8BizException("trigger_count_required 必须在 1–10 之间");
        if (payload.RecoverCountRequired < 1 || payload.RecoverCountRequired > 10)
            throw new S8BizException("recover_count_required 必须在 1–10 之间");

        await _rep.Context.Updateable<AdoS8WatchRule>()
            .SetColumns(x => new AdoS8WatchRule
            {
                PollIntervalSeconds = payload.PollIntervalSeconds,
                TriggerCountRequired = payload.TriggerCountRequired,
                RecoverCountRequired = payload.RecoverCountRequired,
                UpdatedAt = DateTime.Now
            })
            .Where(x => x.Id == id)
            .ExecuteCommandAsync();
        return await _rep.GetByIdAsync(id) ?? entity;
    }

    /// <summary>
    /// S8-SCHED-FRONTEND-1：立即执行一次。把 next_run_at 置为 NOW，让下个 tick 拾取。
    /// 不直接同步执行 evaluator；不阻塞请求；返回 200 + 提示。
    /// </summary>
    public async Task<object> RunNowAsync(long id)
    {
        var entity = await _rep.GetByIdAsync(id) ?? throw new S8BizException("记录不存在");
        if (!entity.Enabled)
            throw new S8BizException("规则未启用，不能立即执行");
        var now = DateTime.Now;
        if (entity.PausedUntil.HasValue && entity.PausedUntil.Value > now)
            throw new S8BizException("规则已暂停，请先恢复");
        if (entity.LockUntil.HasValue && entity.LockUntil.Value > now)
            throw new S8BizException("规则正在执行中，请稍后再试");

        await _rep.Context.Updateable<AdoS8WatchRule>()
            .SetColumns(x => new AdoS8WatchRule
            {
                NextRunAt = now,
                UpdatedAt = now
            })
            .Where(x => x.Id == id)
            .ExecuteCommandAsync();
        return new { id, queued = true, message = "已排队，最长 1 分钟内执行" };
    }

    /// <summary>
    /// S8-SCHED-FRONTEND-1：手工暂停。paused_until = 9999-12-31 哨兵 + pause_reason=MANUAL_PAUSED。
    /// 不强杀正在执行的 lease；当前运行完成后下一轮自然不被拾取。
    /// 不清 last_status / last_error。
    /// </summary>
    public async Task<object> PauseAsync(long id)
    {
        var entity = await _rep.GetByIdAsync(id) ?? throw new S8BizException("记录不存在");
        await _rep.Context.Updateable<AdoS8WatchRule>()
            .SetColumns(x => new AdoS8WatchRule
            {
                PausedUntil = ManualPausedSentinel,
                PauseReason = "MANUAL_PAUSED",
                UpdatedAt = DateTime.Now
            })
            .Where(x => x.Id == id)
            .ExecuteCommandAsync();
        return new { id, paused = true, message = "已暂停" };
    }

    /// <summary>
    /// S8-SCHED-FRONTEND-1：恢复。清 paused_until / pause_reason / last_error；归零 consecutive_failure_count；
    /// next_run_at = NOW 让下个 tick 立即拾取。不改 enabled / params_json / rule_type。
    /// </summary>
    public async Task<object> ResumeAsync(long id)
    {
        var entity = await _rep.GetByIdAsync(id) ?? throw new S8BizException("记录不存在");
        var now = DateTime.Now;
        await _rep.Context.Updateable<AdoS8WatchRule>()
            .SetColumns(x => new AdoS8WatchRule
            {
                PausedUntil = null,
                PauseReason = null,
                ConsecutiveFailureCount = 0,
                LastError = null,
                NextRunAt = now,
                UpdatedAt = now
            })
            .Where(x => x.Id == id)
            .ExecuteCommandAsync();
        return new { id, resumed = true, message = "已恢复，并将在下一轮调度中执行" };
    }

    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");
    }
}