using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Options;

namespace Admin.NET.Plugin.ApprovalFlow.Service;

/// <summary>
/// 审批流审计服务 — 仅做请求审计日志，不用于核心审批推进
/// </summary>
public class SysApprovalService : ITransient
{
    private readonly SqlSugarRepository<ApprovalFlowRecord> _approvalFlowRep;
    private readonly SqlSugarRepository<ApprovalFormRecord> _approvalFormRep;
    private readonly ApprovalFlowService _approvalFlowService;

    private static List<string>? _cachedRoutes;
    private static DateTime _cacheTime = DateTime.MinValue;
    private static readonly TimeSpan CacheDuration = TimeSpan.FromMinutes(5);

    public SysApprovalService(
        SqlSugarRepository<ApprovalFlowRecord> approvalFlowRep,
        SqlSugarRepository<ApprovalFormRecord> approvalFormRep,
        ApprovalFlowService approvalFlowService)
    {
        _approvalFlowRep = approvalFlowRep;
        _approvalFormRep = approvalFormRep;
        _approvalFlowService = approvalFlowService;
    }

    /// <summary>
    /// 匹配审批流程（审计模式 — 仅记录，不阻断）
    /// </summary>
    [NonAction]
    public async Task MatchApproval(HttpContext context)
    {
        var path = context.Request.Path.ToString();
        var segments = path.Split('/', StringSplitOptions.RemoveEmptyEntries);

        if (segments.Length < 3 || !segments[0].Equals("api", StringComparison.OrdinalIgnoreCase))
            return;

        var funcName = segments[1];
        var typeName = segments[2];

        var routes = await GetCachedRoutes();
        if (!routes.Any(r =>
        {
            var parts = r.Split('/');
            return parts.Length >= 2
                && parts[0].Equals(funcName, StringComparison.OrdinalIgnoreCase)
                && parts[1].Equals(typeName, StringComparison.OrdinalIgnoreCase);
        }))
            return;

        var approvalFlow = new ApprovalFlowRecord
        {
            FormName = funcName,
            CreateTime = DateTime.Now,
        };
        await _approvalFlowRep.InsertAsync(approvalFlow);

        var approvalForm = new ApprovalFormRecord
        {
            FlowId = approvalFlow.Id,
            FormName = funcName,
            FormType = typeName,
            CreateTime = DateTime.Now,
        };
        await _approvalFormRep.InsertAsync(approvalForm);
    }

    /// <summary>
    /// 带缓存的路由列表，避免每个请求都查数据库 (B1 fix)
    /// </summary>
    private async Task<List<string>> GetCachedRoutes()
    {
        if (_cachedRoutes != null && DateTime.Now - _cacheTime < CacheDuration)
            return _cachedRoutes;

        _cachedRoutes = await _approvalFlowService.FormRoutes();
        _cacheTime = DateTime.Now;
        return _cachedRoutes;
    }

    /// <summary>
    /// 清除路由缓存（发布/更新流程时调用）
    /// </summary>
    [NonAction]
    public static void InvalidateRouteCache()
    {
        _cachedRoutes = null;
    }
}