// proto/auth.proto
syntax = "proto3";
package komp_ac.auth;

import "common.proto";

service AuthService {
  rpc Register(RegisterRequest) returns (AuthResponse);
  rpc Login(LoginRequest) returns (LoginResponse);
  // Changes the authenticated user's password after verifying the current one.
  rpc ChangePassword(ChangePasswordRequest) returns (PasswordOperationResponse);
  rpc GetAuthorization(GetAuthorizationRequest) returns (AuthorizationSnapshot);
  rpc SetTimezone(SetTimezoneRequest) returns (UserPreferences);

  // Ends the caller's own sessions. Every token issued to them before this
  // call, on every device, stops being accepted -- including the one used to
  // make the call, so the caller must log in again afterwards. Discarding a
  // token client-side is not a logout; this is.
  rpc Logout(LogoutRequest) returns (LogoutResponse);
  // Ends every session of another user, for a leaked token or a departing
  // account. Requires the struct:user area, and the target must rank strictly
  // below the caller.
  rpc RevokeUserSessions(RevokeUserSessionsRequest) returns (RevokeUserSessionsResponse);

  // Role administration. Every call requires the struct:role area, and every
  // target role must rank strictly below the caller's own role.
  rpc ListRoles(ListRolesRequest) returns (ListRolesResponse);
  rpc AddRole(AddRoleRequest) returns (Role);
  rpc RemoveRole(RemoveRoleRequest) returns (Role);

  // Grant administration on the data plane.
  rpc GrantPermission(GrantPermissionRequest) returns (RolePermissions);
  rpc RevokePermission(RevokePermissionRequest) returns (RolePermissions);
  rpc ListRolePermissions(ListRolePermissionsRequest) returns (RolePermissions);
  rpc ListGrantableObjects(ListGrantableObjectsRequest) returns (ListGrantableObjectsResponse);

  // User administration.
  rpc AssignUserRole(AssignUserRoleRequest) returns (UserSummary);
  // Resets a lower-ranked user's password.
  rpc ResetUserPassword(ResetUserPasswordRequest) returns (PasswordOperationResponse);
  rpc ListUsers(ListUsersRequest) returns (ListUsersResponse);
}

message RegisterRequest {
  string username = 1;
  string email = 2;
  string password = 3;
  string password_confirmation = 4;
  string timezone = 5; // IANA timezone, for example Europe/Bratislava
  string phone_country = 6; // ISO 3166-1 alpha-2 country used for national phone numbers, for example SK
}

message AuthResponse {
  string id = 1; // UUID in string format
  string username = 2; // Registered username
  string email = 3; // Registered email (if provided)
  string role = 4; // Always 'guest' for a self-registration
}

message ChangePasswordRequest {
  string current_password = 1;
  string new_password = 2;
  string new_password_confirmation = 3;
}

message PasswordOperationResponse {}

message LoginRequest {
  string identifier = 1; // Can be username or email
  string password = 2;
}

message LoginResponse {
  string access_token = 1; // JWT token
  string token_type = 2; // Usually "Bearer"
  int32 expires_in = 3; // Expiration in seconds (86400 for 24 hours)
  string user_id = 4; // User's UUID in string format
  string role = 5; // User's role
  string username = 6;
  AuthorizationSnapshot authorization = 7;
  string timezone = 8;
  string phone_country = 9;
}

message SetTimezoneRequest {
  string timezone = 1; // IANA timezone, for example Europe/Bratislava
}

message UserPreferences {
  string timezone = 1;
}

message LogoutRequest {}

message LogoutResponse {}

message RevokeUserSessionsRequest {
  string username = 1;
}

message RevokeUserSessionsResponse {}

message GetAuthorizationRequest {}

message Permission {
  // Canonical object string, one of:
  //   struct:<area>            structural area, never grantable at runtime
  //   data:<profile>/<table>   one root table and its whole template family
  //   data:<profile>/*         every table in a profile, present and future
  //   data:*                   every table everywhere
  //   journal:<profile>        one profile's accounting journal
  //   journal:*                every profile's journal
  string object = 1;
  // manage for structural areas; read/insert/update/delete on the data plane.
  string action = 2;
}

message AuthorizationSnapshot {
  string role = 1;
  // Every permission the role holds, inherited ones included.
  repeated Permission permissions = 2;
}

message Role {
  string name = 1;
  // 'structural' (designs the system, never writes data) or 'data'.
  string kind = 2;
  bool built_in = 3;
  // Role this one inherits every grant from; empty when it has no parent.
  string parent = 4;
}

message ListRolesRequest {}

message ListRolesResponse {
  repeated Role roles = 1;
}

message AddRoleRequest {
  string name = 1;
  // Optional data role to inherit from. Must rank below the caller.
  string parent = 2;
}

message RemoveRoleRequest {
  string name = 1;
}

message GrantPermissionRequest {
  string role = 1;
  string object = 2;
  string action = 3;
}

message RevokePermissionRequest {
  string role = 1;
  string object = 2;
  string action = 3;
}

message ListRolePermissionsRequest {
  string role = 1;
}

message RolePermissions {
  string role = 1;
  // Grants stored against this role alone, without inherited ones.
  repeated Permission permissions = 2;
  // Everything the role can actually do, inheritance resolved.
  repeated Permission effective_permissions = 3;
}

message ListGrantableObjectsRequest {
  // The role being edited. The response contains only actions that may be
  // granted to this role by the caller.
  string target_role = 1;
}

message GrantableObject {
  // Canonical value accepted by GrantPermission, for example
  // data:acme/invoices.
  string object = 1;
  // Empty only for the data:* and journal:* global wildcards.
  string profile = 2;
  // Set only for a table-family root.
  string table = 3;
  // One of global_data, global_journal, profile, journal, or table.
  string kind = 4;
  // Actions the caller may grant to target_role for this object.
  repeated string allowed_actions = 5;
}

message ListGrantableObjectsResponse {
  repeated GrantableObject objects = 1;
}

message AssignUserRoleRequest {
  string username = 1;
  string role = 2;
}

message ResetUserPasswordRequest {
  string username = 1;
  string new_password = 2;
  string new_password_confirmation = 3;
}

message UserSummary {
  string id = 1;
  string username = 2;
  string email = 3;
  string role = 4;
}

message ListUsersRequest {}

message ListUsersResponse {
  repeated UserSummary users = 1;
}