using SurrealDb.Net;
using TarninaHub.Application.Abstractions;
using TarninaHub.Application.Dtos;

namespace TarninaHub.Infrastructure.Persistence;

public sealed class AdminService : IAdminService
{
    private const int MaxSubmissions = 200;

    private readonly ISurrealDbClient _client;
    private readonly ISubmissionService _submissions;
    private readonly IKnowledgeItemService _knowledgeItems;

    public AdminService(
        ISurrealDbClient client,
        ISubmissionService submissions,
        IKnowledgeItemService knowledgeItems)
    {
        _client = client;
        _submissions = submissions;
        _knowledgeItems = knowledgeItems;
    }

    public async Task<IReadOnlyList<SubmissionResponse>> ListSubmissionsAsync(
        string? status,
        string? challengeId,
        CancellationToken cancellationToken)
    {
        var page = await _submissions.ListAsync(
            viewerId: string.Empty,
            isStaff: true,
            status,
            page: 1,
            pageSize: MaxSubmissions,
            cancellationToken);

        return string.IsNullOrWhiteSpace(challengeId)
            ? page.Items
            : page.Items.Where(item => item.ChallengeId == challengeId).ToList();
    }

    public async Task<KnowledgeItemResponse?> VerifyKnowledgeItemAsync(
        string knowledgeItemId,
        VerifyKnowledgeItemRequest request,
        CancellationToken cancellationToken)
    {
        var (table, id) = SurrealRecordId.Split(knowledgeItemId);

        var response = await _client.RawQuery(
            "UPDATE type::record($table, $id) SET published = $published, updated_at = time::now();",
            new Dictionary<string, object?>
            {
                ["table"] = table,
                ["id"] = id,
                ["published"] = request.Verified,
            },
            cancellationToken);
        response.EnsureAllOks();

        return await _knowledgeItems.GetAsync(knowledgeItemId, cancellationToken);
    }

    public async Task<AdminMetricsResponse> GetMetricsAsync(CancellationToken cancellationToken)
    {
        var response = await _client.RawQuery(
            "SELECT count() AS count FROM submission GROUP ALL; " +
            "SELECT count() AS count FROM problem GROUP ALL; " +
            "SELECT count() AS count FROM idea GROUP ALL; " +
            "SELECT count() AS count FROM innovation GROUP ALL; " +
            "SELECT count() AS count FROM knowledge_item GROUP ALL; " +
            "SELECT count() AS count FROM user GROUP ALL; " +
            "SELECT count() AS count FROM grant_call WHERE status = 'open' GROUP ALL; " +
            "SELECT count() AS count FROM application GROUP ALL;",
            new Dictionary<string, object?>(),
            cancellationToken);
        response.EnsureAllOks();

        return new AdminMetricsResponse(
            Count(response, 0),
            Count(response, 1),
            Count(response, 2),
            Count(response, 3),
            Count(response, 4),
            Count(response, 5),
            Count(response, 6),
            Count(response, 7));
    }

    private static int Count(SurrealDb.Net.Models.Response.SurrealDbResponse response, int index)
    {
        var rows = response.GetValue<List<CountRow>>(index) ?? [];

        return rows.Count > 0 ? rows[0].Count : 0;
    }
}