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

namespace TarninaHub.Infrastructure.Persistence;

public sealed class ApplicationService : IApplicationService
{
    private const string SelectFields =
        "type::string(id) AS id, type::string(grant_call) AS grant_call, type::string(idea) AS idea, " +
        "content, status, created_at";

    private readonly ISurrealDbClient _client;
    private readonly IGrantCallService _grantCallService;
    private readonly IIdeaService _ideaService;

    public ApplicationService(
        ISurrealDbClient client,
        IGrantCallService grantCallService,
        IIdeaService ideaService)
    {
        _client = client;
        _grantCallService = grantCallService;
        _ideaService = ideaService;
    }

    public async Task<CreateApplicationResult> CreateAsync(
        string userId,
        CreateApplicationRequest request,
        CancellationToken cancellationToken)
    {
        var grantCall = await _grantCallService.GetAsync(request.GrantCallId, cancellationToken);

        if (grantCall is null)
        {
            return new CreateApplicationResult(CreateApplicationOutcome.CallNotFound, null);
        }

        if (!ApplicationWindow.IsOpen(grantCall.Status, grantCall.OpensAt, grantCall.ClosesAt, DateTimeOffset.UtcNow))
        {
            return new CreateApplicationResult(CreateApplicationOutcome.CallNotOpen, null);
        }

        var idea = await _ideaService.GetAsync(request.IdeaId, cancellationToken);

        if (idea is null)
        {
            return new CreateApplicationResult(CreateApplicationOutcome.IdeaNotFound, null);
        }

        var id = Guid.NewGuid().ToString("N");
        var (grantTable, grantId) = SurrealRecordId.Split(request.GrantCallId);
        var (ideaTable, ideaIdPart) = SurrealRecordId.Split(request.IdeaId);

        var response = await _client.RawQuery(
            "CREATE type::record('application', $id) SET " +
            "grant_call = type::record($grantTable, $grantId), " +
            "idea = type::record($ideaTable, $ideaId), " +
            "content = $content, status = 'draft'; " +
            $"SELECT {SelectFields} FROM type::record('application', $id) LIMIT 1;",
            new Dictionary<string, object?>
            {
                ["id"] = id,
                ["grantTable"] = grantTable,
                ["grantId"] = grantId,
                ["ideaTable"] = ideaTable,
                ["ideaId"] = ideaIdPart,
                ["content"] = request.Content ?? new Dictionary<string, string?>(),
            },
            cancellationToken);
        response.EnsureAllOks();

        var rows = response.GetValue<List<ApplicationRow>>(1) ?? [];

        return new CreateApplicationResult(CreateApplicationOutcome.Created, Map(rows[0]));
    }

    public async Task<ApplicationResponse?> GetAsync(string applicationId, CancellationToken cancellationToken)
    {
        var (table, id) = SurrealRecordId.Split(applicationId);

        var response = await _client.RawQuery(
            $"SELECT {SelectFields} FROM type::record($table, $id) LIMIT 1;",
            new Dictionary<string, object?> { ["table"] = table, ["id"] = id },
            cancellationToken);
        response.EnsureAllOks();

        var rows = response.GetValue<List<ApplicationRow>>(0) ?? [];

        return rows.Count > 0 ? Map(rows[0]) : null;
    }

    public async Task<IReadOnlyList<ApplicationResponse>> ListForAuthorAsync(
        string authorId,
        CancellationToken cancellationToken)
    {
        var (table, id) = SurrealRecordId.Split(authorId);

        var response = await _client.RawQuery(
            $"SELECT {SelectFields} FROM application WHERE idea.author = type::record($table, $id) " +
            "ORDER BY created_at DESC;",
            new Dictionary<string, object?> { ["table"] = table, ["id"] = id },
            cancellationToken);
        response.EnsureAllOks();

        var rows = response.GetValue<List<ApplicationRow>>(0) ?? [];

        return rows.Select(Map).ToList();
    }

    private static ApplicationResponse Map(ApplicationRow row) => new(
        row.Id,
        row.GrantCall,
        row.Idea,
        row.Content,
        row.Status,
        row.CreatedAt);
}