using GmRelay.Shared.Domain;

namespace GmRelay.Web.Services;

public sealed record PlayerAttendanceStats(
    Guid PlayerId,
    string DisplayName,
    string? ExternalUsername,
    long TotalSessions,
    long ConfirmedCount,
    long DeclinedCount,
    long NoResponseCount,
    long WaitlistedCount,
    long CancellationAffectedCount,
    decimal AttendanceRate);

public sealed record SessionAuditLogEntry(
    Guid Id,
    Guid SessionId,
    string ActorExternalUserId,
    string ActorName,
    string ChangeType,
    string? OldValue,
    string? NewValue,
    DateTime ChangedAt);

public interface ISessionStore
{
    Task<List<WebGameGroup>> GetGroupsForUserAsync(string platform, string externalUserId);
    Task<WebGameGroup?> GetGroupAsync(Guid groupId);
    Task<bool> IsGroupManagerAsync(Guid groupId, string platform, string externalUserId);
    Task<bool> IsGroupOwnerAsync(Guid groupId, string platform, string externalUserId);
    Task<List<WebGroupManager>> GetGroupManagersAsync(Guid groupId);
    Task<List<WebSession>> GetUpcomingSessionsAsync(Guid groupId);
    Task<WebSession?> GetSessionAsync(Guid sessionId);
    Task<WebSessionBatch?> GetBatchAsync(Guid batchId);
    Task UpdateSessionAsync(Guid sessionId, Guid groupId, string title, DateTime scheduledAt, string joinLink, int? maxPlayers);
    Task PromoteWaitlistedPlayerAsync(Guid sessionId, Guid groupId);
    Task UpdateBatchDetailsAsync(Guid batchId, Guid groupId, string title, string joinLink);
    Task UpdateBatchNotificationModeAsync(Guid batchId, Guid groupId, SessionNotificationMode notificationMode);
    Task RescheduleBatchAsync(Guid batchId, Guid groupId, DateTime firstScheduledAt, int intervalDays);
    Task<WebSessionBatch> CloneBatchAsync(Guid batchId, Guid groupId, BatchCloneInterval interval);
    Task<List<WebCampaignTemplate>> GetCampaignTemplatesAsync(Guid groupId);
    Task<WebCampaignTemplate?> GetCampaignTemplateAsync(Guid templateId);
    Task<WebCampaignTemplate> CreateCampaignTemplateAsync(Guid groupId, CreateCampaignTemplateRequest request);
    Task DeleteCampaignTemplateAsync(Guid templateId, Guid groupId);
    Task<WebSessionBatch> CreateBatchFromTemplateAsync(Guid templateId, Guid groupId, DateTime firstScheduledAt);
    Task AddGroupCoGmAsync(Guid groupId, string ownerPlatform, string ownerExternalUserId, string coGmPlatform, string coGmExternalUserId, string displayName, string? externalUsername);
    Task RemoveGroupCoGmAsync(Guid groupId, string coGmPlatform, string coGmExternalUserId);
    Task<List<WebParticipant>> GetSessionParticipantsAsync(Guid sessionId);
    Task RemovePlayerFromSessionAsync(Guid sessionId, Guid groupId, Guid participantId);
    Task<List<PlayerAttendanceStats>> GetGroupAttendanceStatsAsync(Guid groupId);
    Task LogSessionChangeAsync(Guid sessionId, string actorExternalUserId, string actorName, string changeType, string? oldValue, string? newValue);
    Task<List<SessionAuditLogEntry>> GetSessionHistoryAsync(Guid sessionId);
    Task UpsertDiscordUserAsync(string discordId, string displayName, string? avatarUrl);

    // --- Identity linking (issue #35) ---
    Task<Guid?> ResolveEffectivePlayerIdAsync(string platform, string externalUserId);
    Task<List<LinkedIdentity>> GetLinkedIdentitiesAsync(string platform, string externalUserId);
    Task LinkIdentityAsync(string currentPlatform, string currentExternalUserId, string targetPlatform, string targetExternalUserId, string? currentName);
    Task UnlinkIdentityAsync(string currentPlatform, string currentExternalUserId, string targetPlatform, string targetExternalUserId);
    Task UpsertPlayerAsync(string platform, string externalUserId, string displayName, string? avatarUrl);
}

public sealed record LinkedIdentity(
    string Platform,
    string ExternalUserId,
    string DisplayName,
    string? ExternalUsername,
    string? AvatarUrl,
    DateTime LinkedAt);