from datetime import datetime
from typing import Any, Generic, Literal, TypeVar

from pydantic import BaseModel, ConfigDict, Field, model_validator

T = TypeVar("T")


# ---------------------------------------------------------------------------
# Generic API response wrapper
# ---------------------------------------------------------------------------


class APIResponse(BaseModel, Generic[T]):
    """Standard envelope for every API response."""

    code: int = 0
    message: str = "success"
    data: T | None = None


class PaginationParams(BaseModel):
    """Query parameters for paginated list endpoints."""

    page: int = Field(default=1, ge=1, description="Page number (1-indexed)")
    page_size: int = Field(default=20, ge=1, le=100, description="Items per page")


class PaginatedList(BaseModel, Generic[T]):
    """Paginated result set."""

    items: list[T]
    total: int
    page: int
    page_size: int
    total_pages: int


# ---------------------------------------------------------------------------
# Device schemas
# ---------------------------------------------------------------------------


class DeviceBase(BaseModel):
    imei: str = Field(..., min_length=15, max_length=20, pattern=r"^\d{15,17}$", description="IMEI number (digits only)")
    device_type: str = Field(..., max_length=10, description="Device type code (e.g. P240, P241)")
    name: str | None = Field(None, max_length=100, description="Friendly name")
    timezone: str = Field(default="+8", max_length=30)
    language: str = Field(default="cn", max_length=10)


class DeviceCreate(DeviceBase):
    pass


class DeviceUpdate(BaseModel):
    name: str | None = Field(None, max_length=100)
    iccid: str | None = Field(None, max_length=30)
    imsi: str | None = Field(None, max_length=20)
    timezone: str | None = Field(None, max_length=30)
    language: str | None = Field(None, max_length=10)


class DeviceResponse(DeviceBase):
    model_config = ConfigDict(from_attributes=True)

    id: int
    status: str
    battery_level: int | None = None
    gsm_signal: int | None = None
    last_heartbeat: datetime | None = None
    last_login: datetime | None = None
    iccid: str | None = None
    imsi: str | None = None
    created_at: datetime
    updated_at: datetime | None = None


class DeviceListResponse(APIResponse[PaginatedList[DeviceResponse]]):
    pass


class DeviceSingleResponse(APIResponse[DeviceResponse]):
    pass


# ---------------------------------------------------------------------------
# Location Record schemas
# ---------------------------------------------------------------------------


class LocationRecordBase(BaseModel):
    device_id: int
    location_type: str = Field(..., max_length=10)
    latitude: float | None = Field(None, ge=-90, le=90)
    longitude: float | None = Field(None, ge=-180, le=180)
    speed: float | None = None
    course: float | None = None
    gps_satellites: int | None = None
    gps_positioned: bool = False
    mcc: int | None = None
    mnc: int | None = None
    lac: int | None = None
    cell_id: int | None = None
    rssi: int | None = None
    neighbor_cells: list[dict[str, Any]] | None = None
    wifi_data: list[dict[str, Any]] | None = None
    report_mode: int | None = None
    is_realtime: bool = True
    mileage: float | None = None
    address: str | None = None
    raw_data: str | None = None
    recorded_at: datetime


class LocationRecordCreate(LocationRecordBase):
    pass


class LocationRecordResponse(LocationRecordBase):
    model_config = ConfigDict(from_attributes=True)

    id: int
    imei: str | None = None
    created_at: datetime


class LocationRecordFilters(BaseModel):
    device_id: int | None = None
    location_type: str | None = None
    start_time: datetime | None = None
    end_time: datetime | None = None


class LocationListResponse(APIResponse[PaginatedList[LocationRecordResponse]]):
    pass


# ---------------------------------------------------------------------------
# Alarm Record schemas
# ---------------------------------------------------------------------------


class AlarmRecordBase(BaseModel):
    device_id: int
    alarm_type: str = Field(..., max_length=30)
    alarm_source: str | None = Field(None, max_length=20)
    protocol_number: int
    latitude: float | None = Field(None, ge=-90, le=90)
    longitude: float | None = Field(None, ge=-180, le=180)
    speed: float | None = None
    course: float | None = None
    mcc: int | None = None
    mnc: int | None = None
    lac: int | None = None
    cell_id: int | None = None
    battery_level: int | None = None
    gsm_signal: int | None = None
    fence_data: dict[str, Any] | None = None
    wifi_data: list[dict[str, Any]] | None = None
    address: str | None = None
    recorded_at: datetime


class AlarmRecordCreate(AlarmRecordBase):
    pass


class AlarmRecordResponse(AlarmRecordBase):
    model_config = ConfigDict(from_attributes=True)

    id: int
    imei: str | None = None
    acknowledged: bool
    created_at: datetime


class AlarmAcknowledge(BaseModel):
    acknowledged: bool = True


class AlarmRecordFilters(BaseModel):
    device_id: int | None = None
    alarm_type: str | None = None
    acknowledged: bool | None = None
    start_time: datetime | None = None
    end_time: datetime | None = None


class AlarmListResponse(APIResponse[PaginatedList[AlarmRecordResponse]]):
    pass


# ---------------------------------------------------------------------------
# Heartbeat Record schemas
# ---------------------------------------------------------------------------


class HeartbeatRecordBase(BaseModel):
    device_id: int
    protocol_number: int
    terminal_info: int
    battery_level: int
    gsm_signal: int
    extension_data: dict[str, Any] | None = None


class HeartbeatRecordCreate(HeartbeatRecordBase):
    pass


class HeartbeatRecordResponse(HeartbeatRecordBase):
    model_config = ConfigDict(from_attributes=True)

    id: int
    imei: str | None = None
    created_at: datetime


class HeartbeatListResponse(APIResponse[PaginatedList[HeartbeatRecordResponse]]):
    pass


# ---------------------------------------------------------------------------
# Attendance Record schemas
# ---------------------------------------------------------------------------


class AttendanceRecordBase(BaseModel):
    device_id: int
    attendance_type: str = Field(..., max_length=20)
    attendance_source: str = Field(default="device", max_length=20)  # device, bluetooth, fence
    protocol_number: int
    gps_positioned: bool = False
    latitude: float | None = Field(None, ge=-90, le=90)
    longitude: float | None = Field(None, ge=-180, le=180)
    speed: float | None = None
    course: float | None = None
    gps_satellites: int | None = None
    battery_level: int | None = None
    gsm_signal: int | None = None
    mcc: int | None = None
    mnc: int | None = None
    lac: int | None = None
    cell_id: int | None = None
    wifi_data: list[dict[str, Any]] | None = None
    lbs_data: list[dict[str, Any]] | dict[str, Any] | None = None
    address: str | None = None
    recorded_at: datetime


class AttendanceRecordCreate(AttendanceRecordBase):
    pass


class AttendanceRecordResponse(AttendanceRecordBase):
    model_config = ConfigDict(from_attributes=True)

    id: int
    imei: str | None = None
    created_at: datetime


class AttendanceRecordFilters(BaseModel):
    device_id: int | None = None
    attendance_type: str | None = None
    start_time: datetime | None = None
    end_time: datetime | None = None


class AttendanceListResponse(APIResponse[PaginatedList[AttendanceRecordResponse]]):
    pass


# ---------------------------------------------------------------------------
# Bluetooth Record schemas
# ---------------------------------------------------------------------------


class BluetoothRecordBase(BaseModel):
    device_id: int
    record_type: str = Field(..., max_length=20)
    protocol_number: int
    beacon_mac: str | None = None
    beacon_uuid: str | None = None
    beacon_major: int | None = None
    beacon_minor: int | None = None
    rssi: int | None = None
    beacon_battery: float | None = None
    beacon_battery_unit: str | None = None
    attendance_type: str | None = None
    bluetooth_data: dict[str, Any] | None = None
    latitude: float | None = Field(None, ge=-90, le=90)
    longitude: float | None = Field(None, ge=-180, le=180)
    recorded_at: datetime


class BluetoothRecordCreate(BluetoothRecordBase):
    pass


class BluetoothRecordResponse(BluetoothRecordBase):
    model_config = ConfigDict(from_attributes=True)

    id: int
    imei: str | None = None
    created_at: datetime


class BluetoothRecordFilters(BaseModel):
    device_id: int | None = None
    record_type: str | None = None
    start_time: datetime | None = None
    end_time: datetime | None = None


class BluetoothListResponse(APIResponse[PaginatedList[BluetoothRecordResponse]]):
    pass


# ---------------------------------------------------------------------------
# Beacon Config schemas
# ---------------------------------------------------------------------------


class BeaconConfigBase(BaseModel):
    beacon_mac: str = Field(..., max_length=20, pattern=r"^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$", description="信标MAC地址 (AA:BB:CC:DD:EE:FF)")
    beacon_uuid: str | None = Field(None, max_length=36, description="iBeacon UUID")
    beacon_major: int | None = Field(None, ge=0, le=65535, description="iBeacon Major")
    beacon_minor: int | None = Field(None, ge=0, le=65535, description="iBeacon Minor")
    name: str = Field(..., max_length=100, description="信标名称")
    floor: str | None = Field(None, max_length=20, description="楼层")
    area: str | None = Field(None, max_length=100, description="区域")
    latitude: float | None = Field(None, ge=-90, le=90, description="纬度")
    longitude: float | None = Field(None, ge=-180, le=180, description="经度")
    address: str | None = Field(None, description="详细地址")
    status: Literal["active", "inactive"] = Field(default="active", description="状态")


class BeaconConfigCreate(BeaconConfigBase):
    pass


class BeaconConfigUpdate(BaseModel):
    beacon_uuid: str | None = Field(None, max_length=36)
    beacon_major: int | None = Field(None, ge=0, le=65535)
    beacon_minor: int | None = Field(None, ge=0, le=65535)
    name: str | None = Field(None, max_length=100)
    floor: str | None = Field(None, max_length=20)
    area: str | None = Field(None, max_length=100)
    latitude: float | None = Field(None, ge=-90, le=90)
    longitude: float | None = Field(None, ge=-180, le=180)
    address: str | None = None
    status: Literal["active", "inactive"] | None = None


class BeaconConfigResponse(BaseModel):
    """Response model — no pattern validation on output (existing data may not conform)."""
    model_config = ConfigDict(from_attributes=True)

    id: int
    beacon_mac: str
    beacon_uuid: str | None = None
    beacon_major: int | None = None
    beacon_minor: int | None = None
    name: str
    floor: str | None = None
    area: str | None = None
    latitude: float | None = None
    longitude: float | None = None
    address: str | None = None
    status: str
    created_at: datetime
    updated_at: datetime | None = None


# ---------------------------------------------------------------------------
# Fence Config schemas
# ---------------------------------------------------------------------------


class FenceConfigCreate(BaseModel):
    name: str = Field(..., max_length=100, description="围栏名称")
    fence_type: Literal["circle", "polygon", "rectangle"] = Field(..., description="围栏类型")
    center_lat: float | None = Field(None, ge=-90, le=90, description="中心纬度 (WGS-84)")
    center_lng: float | None = Field(None, ge=-180, le=180, description="中心经度 (WGS-84)")
    radius: float | None = Field(None, ge=0, description="半径 (米)")
    points: str | None = Field(None, description="多边形顶点 JSON [[lng,lat],...]")
    color: str = Field(default="#3b82f6", max_length=20, description="边框颜色")
    fill_color: str | None = Field(None, max_length=20, description="填充颜色")
    fill_opacity: float = Field(default=0.2, ge=0, le=1, description="填充透明度")
    description: str | None = Field(None, description="描述")
    is_active: bool = Field(default=True, description="是否启用")


class FenceConfigUpdate(BaseModel):
    name: str | None = Field(None, max_length=100)
    fence_type: Literal["circle", "polygon", "rectangle"] | None = None
    center_lat: float | None = Field(None, ge=-90, le=90)
    center_lng: float | None = Field(None, ge=-180, le=180)
    radius: float | None = Field(None, ge=0)
    points: str | None = None
    color: str | None = Field(None, max_length=20)
    fill_color: str | None = Field(None, max_length=20)
    fill_opacity: float | None = Field(None, ge=0, le=1)
    description: str | None = None
    is_active: bool | None = None


class FenceConfigResponse(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    name: str
    fence_type: str
    center_lat: float | None = None
    center_lng: float | None = None
    radius: float | None = None
    points: str | None = None
    color: str
    fill_color: str | None = None
    fill_opacity: float
    description: str | None = None
    is_active: bool
    created_at: datetime
    updated_at: datetime | None = None


# ---------------------------------------------------------------------------
# Device-Fence Binding schemas
# ---------------------------------------------------------------------------


class DeviceFenceBindRequest(BaseModel):
    device_ids: list[int] = Field(..., min_length=1, max_length=100, description="设备ID列表")


class FenceBindForDeviceRequest(BaseModel):
    fence_ids: list[int] = Field(..., min_length=1, max_length=100, description="围栏ID列表")


class DeviceFenceBindingResponse(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    device_id: int
    fence_id: int
    created_at: datetime


class FenceDeviceDetail(BaseModel):
    """Binding detail with device info."""
    binding_id: int
    device_id: int
    device_name: str | None = None
    imei: str | None = None
    is_inside: bool = False
    last_check_at: datetime | None = None


class DeviceFenceDetail(BaseModel):
    """Binding detail with fence info."""
    binding_id: int
    fence_id: int
    fence_name: str | None = None
    fence_type: str | None = None
    is_inside: bool = False
    last_check_at: datetime | None = None


# ---------------------------------------------------------------------------
# Command Log schemas
# ---------------------------------------------------------------------------


class CommandCreate(BaseModel):
    device_id: int
    command_type: str = Field(..., max_length=30)
    command_content: str = Field(..., max_length=500)
    server_flag: str = Field(..., max_length=20)


# ---------------------------------------------------------------------------
# Batch operation schemas
# ---------------------------------------------------------------------------


class BatchDeviceCreateItem(BaseModel):
    """Single device in a batch create request."""
    imei: str = Field(..., min_length=15, max_length=20, pattern=r"^\d{15,17}$", description="IMEI number")
    device_type: str = Field(default="P241", max_length=10, description="Device type (P240/P241)")
    name: str | None = Field(None, max_length=100, description="Friendly name")


class BatchDeviceCreateRequest(BaseModel):
    """Batch create devices."""
    devices: list[BatchDeviceCreateItem] = Field(..., min_length=1, max_length=500, description="List of devices to create")


class BatchDeviceCreateResult(BaseModel):
    """Result of a single device in batch create."""
    imei: str
    success: bool
    device_id: int | None = None
    error: str | None = None


class BatchDeviceCreateResponse(BaseModel):
    """Summary of batch create operation."""
    total: int
    created: int
    failed: int
    results: list[BatchDeviceCreateResult]


class BatchCommandRequest(BaseModel):
    """Send the same command to multiple devices."""
    device_ids: list[int] | None = Field(default=None, min_length=1, max_length=100, description="Device IDs (provide device_ids or imeis)")
    imeis: list[str] | None = Field(default=None, min_length=1, max_length=100, description="IMEI list (alternative to device_ids)")
    command_type: str = Field(..., max_length=30, description="Command type (e.g. online_cmd)")
    command_content: str = Field(..., max_length=500, description="Command content")

    @model_validator(mode="after")
    def check_device_ids_or_imeis(self):
        if not self.device_ids and not self.imeis:
            raise ValueError("Must provide device_ids or imeis / 必须提供 device_ids 或 imeis")
        if self.device_ids and self.imeis:
            raise ValueError("Provide device_ids or imeis, not both / 不能同时提供 device_ids 和 imeis")
        return self


class BatchCommandResult(BaseModel):
    """Result of a single command in batch send."""
    device_id: int
    imei: str
    success: bool
    command_id: int | None = None
    error: str | None = None


class BatchCommandResponse(BaseModel):
    """Summary of batch command operation."""
    total: int
    sent: int
    failed: int
    results: list[BatchCommandResult]


class BatchDeviceDeleteRequest(BaseModel):
    """Batch delete devices."""
    device_ids: list[int] = Field(..., min_length=1, max_length=100, description="Device IDs to delete")


class BatchDeviceUpdateRequest(BaseModel):
    """Batch update devices with the same settings."""
    device_ids: list[int] = Field(..., min_length=1, max_length=500, description="Device IDs to update")
    update: DeviceUpdate = Field(..., description="Fields to update")


class CommandUpdate(BaseModel):
    response_content: str | None = None
    status: str | None = Field(None, max_length=20)
    sent_at: datetime | None = None
    response_at: datetime | None = None


class CommandResponse(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    device_id: int
    command_type: str
    command_content: str
    server_flag: str
    response_content: str | None = None
    status: str
    sent_at: datetime | None = None
    response_at: datetime | None = None
    created_at: datetime


class CommandListResponse(APIResponse[PaginatedList[CommandResponse]]):
    pass


# ---------------------------------------------------------------------------
# API Key schemas
# ---------------------------------------------------------------------------


class ApiKeyCreate(BaseModel):
    name: str = Field(..., min_length=1, max_length=100, description="Key name / 名称")
    permissions: Literal["read", "write", "admin"] = Field(default="read", description="Permission level")


class ApiKeyUpdate(BaseModel):
    name: str | None = Field(None, max_length=100)
    permissions: Literal["read", "write", "admin"] | None = None
    is_active: bool | None = None


class ApiKeyResponse(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    name: str
    permissions: str
    is_active: bool
    last_used_at: datetime | None = None
    created_at: datetime


class ApiKeyCreateResponse(ApiKeyResponse):
    """Returned only on creation — includes the plaintext key (shown once)."""
    key: str