using System;
using System.Linq;
using System.Net;
using System.Web;
using System.Threading.Tasks;
using AutopilotMonitor.Functions.Helpers;
using AutopilotMonitor.Functions.Services;
using AutopilotMonitor.Shared.DataAccess;
using AutopilotMonitor.Shared.Models;
using Microsoft.Azure.Functions.Worker;
using Microsoft.Azure.Functions.Worker.Http;
using Microsoft.Extensions.Logging;

namespace AutopilotMonitor.Functions.Functions.Vulnerability
{
    /// <summary>
    /// Returns the full software inventory for a tenant from the SoftwareInventory table.
    /// Global Admin only. Query param: ?tenantId=...
    /// </summary>
    public class GetSoftwareInventoryFunction
    {
        private readonly ILogger<GetSoftwareInventoryFunction> _logger;
        private readonly IVulnerabilityRepository _vulnRepo;
        private readonly GlobalAdminService _globalAdminService;

        public GetSoftwareInventoryFunction(
            ILogger<GetSoftwareInventoryFunction> logger,
            IVulnerabilityRepository vulnRepo,
            GlobalAdminService globalAdminService)
        {
            _logger = logger;
            _vulnRepo = vulnRepo;
            _globalAdminService = globalAdminService;
        }

        [Function("GetSoftwareInventory")]
        public async Task<HttpResponseData> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "vulnerability/software-inventory")] HttpRequestData req)
        {
            try
            {
                // Global Admin only — enforced by PolicyEnforcementMiddleware
                var userIdentifier = TenantHelper.GetUserIdentifier(req);

                var query = HttpUtility.ParseQueryString(req.Url.Query);
                var tenantId = query["tenantId"];

                if (string.IsNullOrEmpty(tenantId))
                {
                    var badRequest = req.CreateResponse(HttpStatusCode.BadRequest);
                    await badRequest.WriteAsJsonAsync(new { success = false, message = "tenantId query parameter is required" });
                    return badRequest;
                }

                var inventory = await _vulnRepo.GetSoftwareInventoryAsync(tenantId);

                var response = req.CreateResponse(HttpStatusCode.OK);
                await response.WriteAsJsonAsync(new SoftwareInventoryResponse
                {
                    Success = true,
                    TenantId = tenantId,
                    Total = inventory.Count,
                    Matched = inventory.Count(i => !string.IsNullOrEmpty(i["cpeUri"]?.ToString())),
                    Unmatched = inventory.Count(i => string.IsNullOrEmpty(i["cpeUri"]?.ToString())),
                    Inventory = inventory
                });
                return response;
            }
            catch (Exception ex)
            {
                return await req.InternalServerErrorAsync(_logger, ex, "GetSoftwareInventory");
            }
        }
    }
}