using System.Reflection;
using System.Text;
using MAX.Framework.Commons;
using System.Text.Json;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging.Abstractions;
using OpenSearch.Client;
using OpenSearch.Net;
using Store.Modules.CloudProduct.Controllers;
using Store.Modules.CloudProduct.Dtos;
using Store.Modules.CloudProduct.Entities;
using Store.Modules.CloudProduct.Services;

if (args.Contains("--integration"))
{
    await IntegrationChecks.RunAsync(args.Contains("--apply-migration"), args.Contains("--migrate-violation-rows"));
    return;
}

var checks = 0;
void Check(bool condition, string message)
{
    if (!condition) throw new Exception(message);
    checks++;
}
void Reject(Action action)
{
    try { action(); }
    catch (AppException) { checks++; return; }
    throw new Exception("Expected validation failure");
}
var grouped = GoodsViolationService.ValidateAndGroup([
    new() { GoodsId = 12, Reasons = " 图片违规 " },
    new() { GoodsId = 12, Reasons = "描述违规" },
    new() { GoodsId = 12, Reasons = "图片违规" },
    new() { GoodsId = 12, Reasons = "涉嫌侵权" },
    new() { GoodsId = 12, Reasons = "描述违规" },
    new() { GoodsId = 13, Reasons = "中文原因" }
]);
Check(grouped.Count == 2 && grouped[12].ToHashSet().SetEquals(new[] { "图片违规", "描述违规", "涉嫌侵权" }), "Duplicate goods/reasons must merge");
Check(grouped[13][0] == "中文原因", "Chinese reason text must survive");
Reject(() => GoodsViolationService.ValidateAndGroup(null));
Reject(() => GoodsViolationService.ValidateAndGroup([]));
Reject(() => GoodsViolationService.ValidateAndGroup([null!]));
Reject(() => GoodsViolationService.ValidateAndGroup([new() { GoodsId = -1, Reasons = "违规" }]));
Reject(() => GoodsViolationService.ValidateAndGroup([new() { GoodsId = 1, Reasons = "" }]));
Reject(() => GoodsViolationService.ValidateAndGroup([new() { GoodsId = 1, Reasons = "  " }]));
Reject(() => GoodsViolationService.ValidateAndGroup([new() { GoodsId = 1, Reasons = null! }]));
Reject(() => GoodsViolationService.ValidateAndGroup(new ReportGoodsViolationItem[1001]));

Reject(() => GoodsViolationService.ValidateAndGroup([new() { GoodsId = 1, Reasons = new string('中', 101) }]));
Reject(() => GoodsViolationService.ValidateAndGroup([new() { GoodsId = 1, Reasons = null! }]));

// SQL generation only: no database connection or production data access.
using var db = new FreeSql.FreeSqlBuilder().UseConnectionString(FreeSql.DataType.MySql,
    "Server=127.0.0.1;Database=checks;User Id=unused;Password=unused").Build();
var sql = db.Select<GoodsEntity>().As("g")
    .Where(x => x.Status == 0 && x.IsSegmented == 0)
    .Where("NOT EXISTS (SELECT 1 FROM goods_violation v WHERE v.goods_id = g.goods_id)")
    .OrderBy(x => x.GoodsId).Limit(1000).ToSql();
Check(sql.Contains("NOT EXISTS") && sql.IndexOf("NOT EXISTS") < sql.IndexOf("limit", StringComparison.OrdinalIgnoreCase),
    "Violation filter must precede paging");
Check(sql.Contains("FROM `goods` g", StringComparison.OrdinalIgnoreCase), "Anti-join alias must match: " + sql);
var pendingSql = db.Select<GoodsViolationEntity>().Where(x => !x.IsIndexDeleted).ToSql();
Check(pendingSql.Contains("is_index_deleted") && !pendingSql.Contains("off_shelf_status"), "Renamed column mapping");
var insertSql = db.Insert(new GoodsViolationEntity { GoodsId = 1, ReasonId = 2 }).NoneParameter().ToSql();
Check(insertSql.Contains("reason_id") && !insertSql.Contains("reason_ids"), "Reason must be stored as a scalar ID");

var request = JsonSerializer.Deserialize<ReportGoodsViolationItem>("""{"goodsId":1,"reasons":"图片违规"}""", new JsonSerializerOptions(JsonSerializerDefaults.Web))!;
Check(request.Reasons == "图片违规", "JSON request accepts reason names");
var reportJson = JsonSerializer.Serialize(new ReportGoodsViolationsResult { GoodsId = 1, IsOffShelf = true },
    new JsonSerializerOptions(JsonSerializerDefaults.Web));
Check(reportJson == """{"goodsId":1,"isOffShelf":true}""", "Report response contains only goods ID and off-shelf status");
try
{
    JsonSerializer.Deserialize<ReportGoodsViolationItem>("""{"goodsId":1,"reasons":["图片违规"]}""", new JsonSerializerOptions(JsonSerializerDefaults.Web));
    throw new Exception("Array reason accepted");
}
catch (JsonException) { checks++; }
Check(!typeof(GoodsController).GetMethods().Any(x => x.Name.Contains("ByReason")), "Reason query must not be exposed");
var removalService = new GoodsViolationService(null!, null!, null!, NullLogger<GoodsViolationService>.Instance);
Reject(() => removalService.RemoveAsync(null).GetAwaiter().GetResult());
Reject(() => removalService.RemoveAsync([]).GetAwaiter().GetResult());
Reject(() => removalService.RemoveAsync([0]).GetAwaiter().GetResult());
Reject(() => removalService.RemoveAsync([-1]).GetAwaiter().GetResult());
Reject(() => removalService.RemoveAsync(new long[1001]).GetAwaiter().GetResult());

// Exercise deletion with an in-memory OpenSearch transport, without a real server.
var config = new ConfigurationBuilder().AddInMemoryCollection(new Dictionary<string, string?>
{
    ["Search:Url"] = "http://localhost:9200", ["Search:IndexName"] = "goods"
}).Build();
var serviceType = typeof(IOpenSearchService).Assembly.GetType("Store.Modules.CloudProduct.Services.OpenSearchService")!;
var logger = Activator.CreateInstance(typeof(NullLogger<>).MakeGenericType(serviceType));
async Task TestDelete(int status, string body, bool shouldFail)
{
    var service = (IOpenSearchService)Activator.CreateInstance(serviceType, config, logger, db, new GoodsIndexLock(config))!;
    using var transport = new InMemoryConnection(Encoding.UTF8.GetBytes(body), status);
    var client = new OpenSearchClient(new ConnectionSettings(new SingleNodeConnectionPool(new Uri("http://localhost:9200")), transport));
    serviceType.GetField("_client", BindingFlags.Instance | BindingFlags.NonPublic)!.SetValue(service, client);
    try
    {
        await service.DeleteDocumentsAsync([123]);
        Check(!shouldFail, $"HTTP {status}: expected delete failure");
    }
    catch (AppException)
    {
        Check(shouldFail, $"HTTP {status}: unexpected delete failure");
    }
}
await TestDelete(403, "{}", true);
await TestDelete(500, "{}", true);
await TestDelete(404, "{}", false);
await TestDelete(200, """{"errors":false,"items":[{"delete":{"_index":"goods","_id":"123","status":200}}]}""", false);
await TestDelete(200, """{"errors":true,"items":[{"delete":{"_index":"goods","_id":"123","status":404,"result":"not_found"}}]}""", false);
await TestDelete(200, """{"errors":true,"items":[{"delete":{"_index":"goods","_id":"123","status":429,"error":{"type":"rejected","reason":"busy"}}}]}""", true);
await TestDelete(200, """{"errors":false,"items":[]}""", true);
Console.WriteLine($"PASS: {checks} checks (no external services accessed)");