using Dapper;
using FastEndpoints;
using Npgsql;
using Shared.Operations;

namespace Modules.Common.Reconcile.Search;

public sealed class SearchReconcileRequest
{
    public string? ReconcileType { get; init; }
    public string? Status { get; init; }
    public string? Keyword { get; init; }
    public int Page { get; init; } = 1;
    public int PageSize { get; init; } = 200;
}

public sealed class Endpoint(NpgsqlDataSource dataSource) : Endpoint<SearchReconcileRequest, ReconcileResponse>
{
    public override void Configure() { Get("/api/reconcile/items"); Permissions("common.reconcile.read"); }

    public override async Task HandleAsync(SearchReconcileRequest req, CancellationToken ct)
    {
        var tenant = OperationsIdentity.TenantId(User);
        var page = Math.Max(1, req.Page);
        var pageSize = Math.Clamp(req.PageSize, 1, 500);
        var offset = (page - 1) * pageSize;
        await using var connection = await dataSource.OpenConnectionAsync(ct);

        const string rowsSql = """
        select id, reconcile_type as ReconcileType, reference_no as ReferenceNo,
               source_label as SourceLabel, target_label as TargetLabel,
               expected_value as ExpectedValue, actual_value as ActualValue,
               difference_value as DifferenceValue, reason_code as ReasonCode, reason_text as ReasonText,
               status, occurred_at as OccurredAt, source_id as SourceId, target_id as TargetId, version
          from kbx.reconcile_items
         where tenant_id=@Tenant
           and (@ReconcileType is null or reconcile_type=@ReconcileType)
           and (@Status is null or status=@Status)
           and (@Keyword is null or reference_no ilike '%' || @Keyword || '%' or reason_text ilike '%' || @Keyword || '%')
         order by case status when 'mismatch' then 0 when 'pending' then 1 when 'resolved' then 2 else 3 end,
                  occurred_at desc
         limit @PageSize offset @Offset;
        """;
        const string summarySql = """
        select count(*)::int as TotalCount,
               count(*) filter(where status='matched')::int as MatchedCount,
               count(*) filter(where status='mismatch')::int as MismatchCount,
               count(*) filter(where status='pending')::int as PendingCount,
               count(*) filter(where status='resolved')::int as ResolvedCount
          from kbx.reconcile_items
         where tenant_id=@Tenant
           and (@ReconcileType is null or reconcile_type=@ReconcileType)
           and (@Keyword is null or reference_no ilike '%' || @Keyword || '%' or reason_text ilike '%' || @Keyword || '%');
        """;
        var args = new {
            Tenant = tenant,
            ReconcileType = Empty(req.ReconcileType),
            Status = Empty(req.Status),
            Keyword = Empty(req.Keyword),
            PageSize = pageSize,
            Offset = offset,
        };
        var rows = (await connection.QueryAsync<ReconcileItemDto>(new CommandDefinition(rowsSql, args, cancellationToken: ct))).AsList();
        var summary = await connection.QuerySingleAsync<ReconcileSummary>(new CommandDefinition(summarySql, args, cancellationToken: ct));
        await Send.OkAsync(new ReconcileResponse(rows, summary), ct);
    }

    private static string? Empty(string? value) => string.IsNullOrWhiteSpace(value) ? null : value.Trim();
}