using OrpaonVision.ConfigApp.Annotation.Options;
using OrpaonVision.Core.Annotation;
using OrpaonVision.Core.Annotation.Contracts;
using OrpaonVision.Core.Enums;
using OrpaonVision.Core.Results;

namespace OrpaonVision.ConfigApp.Annotation.Services;

/// <summary>
/// CVAT 标注同步应用服务（骨架实现）。
/// 
/// 说明：
/// - 当前阶段先提供参数校验与返回契约，便于前后链路先跑通；
/// - 实际 HTTP 调用、认证、重试策略将在后续迭代补齐。
/// </summary>
public sealed class CvatAnnotationSyncAppService : IAnnotationSyncAppService
{
    private readonly CvatOptions _options;

    /// <summary>
    /// 构造函数。
    /// </summary>
    /// <param name="options">CVAT 配置。</param>
    public CvatAnnotationSyncAppService(CvatOptions options)
    {
        _options = options;
    }

    /// <inheritdoc />
    public Task<Result> SyncProjectAsync(SyncAnnotationProjectCommand command, CancellationToken cancellationToken = default)
    {
        if (command.Platform != AnnotationPlatformEnum.Cvat)
        {
            return Task.FromResult(Result.Fail("ANNOTATION_PLATFORM_NOT_SUPPORTED", "当前版本仅支持 CVAT 平台同步。"));
        }

        if (command.ProjectId == Guid.Empty || command.AnnotationTaskId == Guid.Empty)
        {
            return Task.FromResult(Result.Fail("ANNOTATION_ARGUMENT_INVALID", "项目标识或标注任务标识无效。"));
        }

        if (string.IsNullOrWhiteSpace(command.CvatServerEndpoint))
        {
            return Task.FromResult(Result.Fail("ANNOTATION_ENDPOINT_REQUIRED", "CVAT 服务地址不能为空。"));
        }

        if (!Uri.TryCreate(command.CvatServerEndpoint, UriKind.Absolute, out _))
        {
            return Task.FromResult(Result.Fail("ANNOTATION_ENDPOINT_INVALID", "CVAT 服务地址格式不合法。"));
        }

        if (command.CvatTaskId <= 0 || command.CvatProjectId <= 0)
        {
            return Task.FromResult(Result.Fail("ANNOTATION_CVAT_ID_INVALID", "CVAT 项目 ID 或任务 ID 必须大于 0。"));
        }

        // 当前为骨架实现：预留后续与 CVAT API 的双向同步逻辑。
        return Task.FromResult(Result.Success(message: "CVAT 同步请求已受理。"));
    }

    /// <inheritdoc />
    public Task<Result<AnnotationSyncStatusDto>> GetSyncStatusAsync(Guid projectId, CancellationToken cancellationToken = default)
    {
        if (projectId == Guid.Empty)
        {
            return Task.FromResult(Result<AnnotationSyncStatusDto>.Fail("ANNOTATION_PROJECT_ID_INVALID", "项目标识不能为空。"));
        }

        var status = new AnnotationSyncStatusDto
        {
            ProjectId = projectId,
            AnnotationTaskId = Guid.Empty,
            Platform = AnnotationPlatformEnum.Cvat,
            SyncStatus = AnnotationSyncStatusEnum.None,
            ProgressPercent = 0,
            LastSyncedAtUtc = null,
            LastErrorMessage = null
        };

        return Task.FromResult(Result<AnnotationSyncStatusDto>.Success(status, message: $"CVAT 状态查询完成（{_options.ServerEndpoint}）。"));
    }
}