using System.Text.Json;
using Dapper;
using KArtSell.BuildingBlocks.Data;
using KArtSell.BuildingBlocks.Hashing;
using KArtSell.BuildingBlocks.Reliability;
using KArtSell.Modules.ModelOperations.Application;

namespace KArtSell.Modules.ModelOperations.Infrastructure;

public sealed class DapperModelOperationRequestRepository(
    IDbConnectionFactory connectionFactory,
    IOutboxWriter outboxWriter) : IModelOperationRequestRepository
{
    private const string InsertSql = """
        insert into evaluation.model_operation_request
        (request_id, schedule_id, operation_code, scope_key, automation_mode, idempotency_key,
         dataset_id, data_hash, model_version, config_version, code_sha, contract_version,
         lifecycle_state, correlation_id, status, requested_at, scheduled_for)
        values
        (@RequestId, @ScheduleId, @OperationCode, @ScopeKey, @AutomationMode, @IdempotencyKey,
         @DatasetId, @DataHash, @ModelVersion, @ConfigVersion, @CodeSha, @ContractVersion,
         @LifecycleState, @CorrelationId, 'REQUESTED', @RequestedAt, @ScheduledFor)
        on conflict (idempotency_key) do nothing;
        """;

    private const string InsertStatusEventSql = """
        insert into evaluation.model_operation_status_event
        (event_id, request_id, from_status, to_status, reason_code, payload_hash,
         actor_type, correlation_id, occurred_at)
        values
        (@EventId, @RequestId, null, 'REQUESTED', null, @PayloadHash,
         'SYSTEM', @CorrelationId, @OccurredAt);
        """;

    public async Task<bool> AddAsync(ModelOperationRequest request, CancellationToken cancellationToken)
    {
        await using var connection = await connectionFactory.OpenAsync(cancellationToken);
        await using var transaction = await connection.BeginTransactionAsync(cancellationToken);

        var affected = await connection.ExecuteAsync(new CommandDefinition(
            InsertSql,
            new
            {
                request.RequestId,
                request.ScheduleId,
                request.OperationCode,
                request.ScopeKey,
                request.AutomationMode,
                request.IdempotencyKey,
                request.ScheduledFor,
                request.Context.VersionSet.DatasetId,
                request.Context.VersionSet.DataHash,
                request.Context.VersionSet.ModelVersion,
                request.Context.VersionSet.ConfigVersion,
                request.Context.VersionSet.CodeSha,
                request.Context.VersionSet.ContractVersion,
                request.Context.LifecycleState,
                request.CorrelationId,
                request.RequestedAt
            },
            transaction,
            cancellationToken: cancellationToken));

        if (affected == 1)
        {
            var payload = JsonSerializer.Serialize(new
            {
                requestId = request.RequestId,
                request.OperationCode,
                request.ScopeKey,
                request.AutomationMode,
                request.ScheduledFor,
                request.CatchUpPolicy,
                request.MaxCatchUp,
                versionSet = request.Context.VersionSet,
                boundary = "NO_AUTO_MODEL_MUTATION"
            });
            var payloadHash = ContentHasher.Sha256(payload);

            await connection.ExecuteAsync(new CommandDefinition(
                InsertStatusEventSql,
                new
                {
                    EventId = Guid.NewGuid(),
                    request.RequestId,
                    PayloadHash = payloadHash,
                    request.CorrelationId,
                    OccurredAt = request.RequestedAt
                },
                transaction,
                cancellationToken: cancellationToken));

            var message = new OutboxMessage(
                request.RequestId,
                "ModelOperationRequested",
                1,
                payload,
                request.CorrelationId,
                request.RequestedAt,
                payloadHash);
            await outboxWriter.AddAsync(connection, transaction, message, cancellationToken);
        }

        await transaction.CommitAsync(cancellationToken);
        return affected == 1;
    }
}