use libc::{c_int, c_uint};

// TODO: Import constants from C header file at compile time.

pub type PamFlag = c_uint;
pub type PamItemType = c_int;
pub type PamMessageStyle = c_int;
pub type PamResultCode = c_int;
pub type AlwaysZero = c_int;

// The Linux-PAM flags
// see /usr/include/security/_pam_types.h
pub const PAM_SILENT: PamFlag = 0x8000;
pub const PAM_DISALLOW_NULL_AUTHTOK: PamFlag = 0x0001;
pub const PAM_ESTABLISH_CRED: PamFlag = 0x0002;
pub const PAM_DELETE_CRED: PamFlag = 0x0004;
pub const PAM_REINITIALIZE_CRED: PamFlag = 0x0008;
pub const PAM_REFRESH_CRED: PamFlag = 0x0010;
pub const PAM_CHANGE_EXPIRED_AUTHTOK: PamFlag = 0x0020;

// The Linux-PAM item types
// see /usr/include/security/_pam_types.h
/// The service name
pub const PAM_SERVICE: PamItemType = 1;
/// The user name
pub const PAM_USER: PamItemType = 2;
/// The tty name
pub const PAM_TTY: PamItemType = 3;
/// The remote host name
pub const PAM_RHOST: PamItemType = 4;
/// The pam_conv structure
pub const PAM_CONV: PamItemType = 5;
/// The authentication token (password)
pub const PAM_AUTHTOK: PamItemType = 6;
/// The old authentication token
pub const PAM_OLDAUTHTOK: PamItemType = 7;
/// The remote user name
pub const PAM_RUSER: PamItemType = 8;
/// the prompt for getting a username
pub const PAM_USER_PROMPT: PamItemType = 9;
/* Linux-PAM :extensionsPamItemType = */
/// app supplied function to override failure delays
pub const PAM_FAIL_DELAY: PamItemType = 10;
/// X :display name
pub const PAM_XDISPLAY: PamItemType = 11;
/// X :server authentication data
pub const PAM_XAUTHDATA: PamItemType = 12;
/// The type for pam_get_authtok
pub const PAM_AUTHTOK_TYPE: PamItemType = 13;

// Message styles
pub const PAM_PROMPT_ECHO_OFF: PamMessageStyle = 1;
pub const PAM_PROMPT_ECHO_ON: PamMessageStyle = 2;
pub const PAM_ERROR_MSG: PamMessageStyle = 3;
pub const PAM_TEXT_INFO: PamMessageStyle = 4;
/// yes/no/maybe conditionals
pub const PAM_RADIO_TYPE: PamMessageStyle = 5;
pub const PAM_BINARY_PROMPT: PamMessageStyle = 7;

// The Linux-PAM return values
// see /usr/include/security/_pam_types.h
pub const PAM_SUCCESS: PamResultCode = 0;
pub const PAM_OPEN_ERR: PamResultCode = 1;
pub const PAM_SYMBOL_ERR: PamResultCode = 2;
pub const PAM_SERVICE_ERR: PamResultCode = 3;
pub const PAM_SYSTEM_ERR: PamResultCode = 4;
pub const PAM_BUF_ERR: PamResultCode = 5;
pub const PAM_PERM_DENIED: PamResultCode = 6;
pub const PAM_AUTH_ERR: PamResultCode = 7;
pub const PAM_CRED_INSUFFICIENT: PamResultCode = 8;
pub const PAM_AUTHINFO_UNAVAIL: PamResultCode = 9;
pub const PAM_USER_UNKNOWN: PamResultCode = 10;
pub const PAM_MAXTRIES: PamResultCode = 11;
pub const PAM_NEW_AUTHTOK_REQD: PamResultCode = 12;
pub const PAM_ACCT_EXPIRED: PamResultCode = 13;
pub const PAM_SESSION_ERR: PamResultCode = 14;
pub const PAM_CRED_UNAVAIL: PamResultCode = 15;
pub const PAM_CRED_EXPIRED: PamResultCode = 16;
pub const PAM_CRED_ERR: PamResultCode = 17;
pub const PAM_NO_MODULE_DATA: PamResultCode = 18;
pub const PAM_CONV_ERR: PamResultCode = 19;
pub const PAM_AUTHTOK_ERR: PamResultCode = 20;
pub const PAM_AUTHTOK_RECOVERY_ERR: PamResultCode = 21;
pub const PAM_AUTHTOK_LOCK_BUSY: PamResultCode = 22;
pub const PAM_AUTHTOK_DISABLE_AGING: PamResultCode = 23;
pub const PAM_TRY_AGAIN: PamResultCode = 24;
pub const PAM_IGNORE: PamResultCode = 25;
pub const PAM_ABORT: PamResultCode = 26;
pub const PAM_AUTHTOK_EXPIRED: PamResultCode = 27;
pub const PAM_MODULE_UNKNOWN: PamResultCode = 28;
pub const PAM_BAD_ITEM: PamResultCode = 29;
pub const PAM_CONV_AGAIN: PamResultCode = 30;
pub const PAM_INCOMPLETE: PamResultCode = 31;