"""
Protocol type definitions for Nova-Sim WebSocket API.

This module defines the structure of all WebSocket messages exchanged between
clients and the server, including both request and response messages.
"""

from typing import TypedDict, Literal, Optional, Union, List


# ============================================================================
# Common Types
# ============================================================================

RobotType = Literal["g1", "spot", "ur5", "ur5_t_push"]
SceneType = Optional[str]
ControlMode = Literal["ik", "joint"]


# ============================================================================
# Action Messages (Client -> Server)
# ============================================================================

class ActionData(TypedDict, total=False):
    """Velocity-based action commands for robot control.

    For locomotion robots (G1, Spot):
        - vx: Forward/backward velocity [-1, 1]
        - vy: Left/right strafe velocity [-1, 1]
        - vyaw: Turn rate [-1, 1]

    For robot arms (UR5):
        - vx, vy, vz: Cartesian translation velocities (m/s)
        - vrx, vry, vrz: Cartesian rotation velocities (rad/s)
        - j1-j6: Joint velocities (rad/s)
        - gripper: Gripper position [0-255]
    """
    # Cartesian translation velocities (m/s for UR5, normalized for locomotion)
    vx: float
    vy: float
    vz: float

    # Rotation velocity (rad/s for UR5, normalized for locomotion)
    vyaw: float

    # Cartesian rotation velocities (rad/s, UR5 only)
    vrx: float
    vry: float
    vrz: float

    # Joint velocities (rad/s, UR5 only)
    j1: float
    j2: float
    j3: float
    j4: float
    j5: float
    j6: float

    # Gripper position (0=open, 255=closed, UR5 only)
    gripper: float


class ActionMessage(TypedDict):
    """Action command message for all robots."""
    type: Literal["action"]
    data: ActionData


class TeleopActionData(TypedDict, total=False):
    """Teleoperation action data (backward compatible with old teleop_command)."""
    vx: float
    vy: float
    vz: float
    # Backward compatibility: accept old dx/dy/dz format
    dx: float
    dy: float
    dz: float


class TeleopActionMessage(TypedDict):
    """Teleoperation action message (UR5 keyboard control)."""
    type: Literal["teleop_action"]
    data: TeleopActionData


# ============================================================================
# Other Client -> Server Messages
# ============================================================================

class ResetData(TypedDict, total=False):
    """Reset environment data."""
    seed: Optional[int]


class ResetMessage(TypedDict):
    """Reset environment message."""
    type: Literal["reset"]
    data: ResetData


class SwitchRobotData(TypedDict):
    """Switch robot data."""
    robot: RobotType
    scene: Optional[str]


class SwitchRobotMessage(TypedDict):
    """Switch robot message."""
    type: Literal["switch_robot"]
    data: SwitchRobotData


class CameraRotateData(TypedDict):
    """Camera rotation data."""
    action: Literal["rotate"]
    dx: float
    dy: float


class CameraZoomData(TypedDict):
    """Camera zoom data."""
    action: Literal["zoom"]
    dz: float


class CameraPanData(TypedDict):
    """Camera pan data."""
    action: Literal["pan"]
    dx: float
    dy: float


class CameraSetDistanceData(TypedDict):
    """Camera set distance data."""
    action: Literal["set_distance"]
    distance: float


CameraData = Union[CameraRotateData, CameraZoomData, CameraPanData, CameraSetDistanceData]


class CameraMessage(TypedDict):
    """Camera control message."""
    type: Literal["camera"]
    data: CameraData


class CameraFollowData(TypedDict):
    """Camera follow mode data."""
    follow: bool


class CameraFollowMessage(TypedDict):
    """Camera follow mode message."""
    type: Literal["camera_follow"]
    data: CameraFollowData


# ============================================================================
# UR5-Specific Client -> Server Messages
# ============================================================================

class ArmTargetData(TypedDict):
    """Arm target position data (IK mode)."""
    x: float
    y: float
    z: float


class ArmTargetMessage(TypedDict):
    """Set arm target position message (UR5, IK mode)."""
    type: Literal["arm_target"]
    data: ArmTargetData


class ArmOrientationData(TypedDict):
    """Arm target orientation data (IK mode)."""
    roll: float
    pitch: float
    yaw: float


class ArmOrientationMessage(TypedDict):
    """Set arm target orientation message (UR5, IK mode)."""
    type: Literal["arm_orientation"]
    data: ArmOrientationData


class UseOrientationData(TypedDict):
    """Toggle orientation control data."""
    enabled: bool


class UseOrientationMessage(TypedDict):
    """Toggle orientation control message (UR5)."""
    type: Literal["use_orientation"]
    data: UseOrientationData


class JointPositionsData(TypedDict):
    """Joint positions data (joint mode)."""
    positions: List[float]  # Array of 6 joint angles in radians


class JointPositionsMessage(TypedDict):
    """Set joint positions message (UR5, joint mode)."""
    type: Literal["joint_positions"]
    data: JointPositionsData


class ControlModeData(TypedDict):
    """Control mode data."""
    mode: ControlMode


class ControlModeMessage(TypedDict):
    """Set control mode message (UR5)."""
    type: Literal["control_mode"]
    data: ControlModeData


class GripperData(TypedDict):
    """Gripper control data."""
    action: Literal["open", "close"]
    value: Optional[int]  # 0-255, only used if action is not "open" or "close"


class GripperMessage(TypedDict):
    """Gripper control message (UR5)."""
    type: Literal["gripper"]
    data: GripperData


class NovaModeSetting(TypedDict):
    """Nova API mode settings."""
    state_streaming: bool
    ik: bool


class SetNovaModeData(TypedDict):
    """Set Nova API mode data."""
    enabled: Optional[bool]  # Legacy: enable/disable all Nova features
    # New granular settings:
    state_streaming: Optional[bool]
    ik: Optional[bool]


class SetNovaModeMessage(TypedDict):
    """Set Nova API mode message (UR5)."""
    type: Literal["set_nova_mode"]
    data: SetNovaModeData


# ============================================================================
# Client Identity & Notification Messages (Client -> Server)
# ============================================================================

class ClientIdentityData(TypedDict):
    """Client identity data."""
    client_id: str


class ClientIdentityMessage(TypedDict):
    """Client identity handshake message."""
    type: Literal["client_identity"]
    data: ClientIdentityData


class ClientNotificationData(TypedDict, total=False):
    """Client notification data."""
    message: str
    level: Literal["info", "warning", "error"]


class ClientNotificationMessage(TypedDict):
    """Client notification message."""
    type: Literal["client_notification"]
    data: ClientNotificationData


class EpisodeControlData(TypedDict):
    """Episode control data."""
    action: Literal["terminate", "truncate"]


class EpisodeControlMessage(TypedDict):
    """Episode control message (trainer only)."""
    type: Literal["episode_control"]
    data: EpisodeControlData


# ============================================================================
# Server -> Client Messages
# ============================================================================

class Position(TypedDict):
    """3D position."""
    x: float
    y: float
    z: float


class Quaternion(TypedDict):
    """Quaternion orientation."""
    w: float
    x: float
    y: float
    z: float


class EulerAngles(TypedDict):
    """Euler angles orientation."""
    roll: float
    pitch: float
    yaw: float


class SceneObject(TypedDict):
    """Scene object information (position and orientation)."""
    name: str
    position: Position
    orientation: Quaternion


class LocomotionObservation(TypedDict):
    """Observation data for locomotion robots (G1, Spot)."""
    position: Position
    orientation: Quaternion


class UR5Observation(TypedDict):
    """Observation data for UR5 robot arm."""
    end_effector: Position
    ee_orientation: Quaternion
    ee_target: Position
    ee_target_orientation: EulerAngles
    gripper: int  # 0-255
    joint_positions: List[float]  # 6 joint angles
    joint_targets: List[float]  # 6 target joint angles


Observation = Union[LocomotionObservation, UR5Observation]


class NovaApiStatus(TypedDict):
    """Nova API integration status."""
    connected: bool
    state_streaming: bool
    ik: bool


class StateData(TypedDict, total=False):
    """State broadcast data."""
    observation: Observation
    steps: int
    reward: float
    teleop_action: ActionData  # Current action/velocity commands
    connected_clients: List[str]  # List of connected client IDs
    scene_objects: List[SceneObject]  # Scene objects (position and orientation)

    # UR5-specific fields
    control_mode: ControlMode
    nova_api: NovaApiStatus


class StateMessage(TypedDict):
    """State broadcast message."""
    type: Literal["state"]
    data: StateData


class ConnectedClientsData(TypedDict):
    """Connected clients status data."""
    clients: List[str]  # List of connected client IDs


class ConnectedClientsMessage(TypedDict):
    """Connected clients broadcast message (to all clients)."""
    type: Literal["connected_clients"]
    data: ConnectedClientsData


class ClientNotificationBroadcast(TypedDict):
    """Client notification broadcast (to all clients)."""
    type: Literal["client_notification"]
    data: ClientNotificationData


# ============================================================================
# HTTP Response Types
# ============================================================================

class CameraIntrinsics(TypedDict):
    """Camera intrinsics for pinhole camera model."""
    fx: float
    fy: float
    cx: float
    cy: float
    width: int
    height: int
    fovy_degrees: float


class CameraPose(TypedDict):
    """Camera pose in world coordinates."""
    position: Position
    orientation: Quaternion


class CameraFeed(TypedDict, total=False):
    """Camera feed information."""
    name: str
    label: str
    url: str
    pose: CameraPose
    intrinsics: CameraIntrinsics


class EnvResponse(TypedDict, total=False):
    """GET /env response."""
    robot: RobotType
    scene: str
    has_gripper: bool
    control_mode: ControlMode
    action_space: dict  # Gym space serialization
    observation_space: dict  # Gym space serialization
    camera_feeds: List[CameraFeed]
    home_pose: List[float]  # Joint angles for home position


class CommandInfo(TypedDict):
    """Command metadata."""
    name: str
    description: str


class MetadataResponse(TypedDict):
    """GET /metadata response."""
    robots: List[str]
    commands: List[CommandInfo]


# ============================================================================
# Union Types for All Messages
# ============================================================================

ClientMessage = Union[
    ActionMessage,
    TeleopActionMessage,
    ResetMessage,
    SwitchRobotMessage,
    CameraMessage,
    CameraFollowMessage,
    ArmTargetMessage,
    ArmOrientationMessage,
    UseOrientationMessage,
    JointPositionsMessage,
    ControlModeMessage,
    GripperMessage,
    SetNovaModeMessage,
    ClientIdentityMessage,
    ClientNotificationMessage,
    EpisodeControlMessage,
]

ServerMessage = Union[
    StateMessage,
    ConnectedClientsMessage,
    ClientNotificationBroadcast,
]