"""Audit log model for tracking sensitive operations."""

from datetime import datetime
from enum import Enum
from typing import Any, Dict, Optional
from bson import ObjectId
from pydantic import BaseModel, Field

from .user import PyObjectId


class AuditAction(str, Enum):
    """Enumeration of auditable actions."""
    
    # Authentication actions
    LOGIN_SUCCESS = "auth.login.success"
    LOGIN_FAILURE = "auth.login.failure"
    LOGOUT = "auth.logout"
    TOKEN_REFRESH = "auth.token.refresh"
    PASSWORD_CHANGE = "auth.password.change"
    PASSWORD_RESET = "auth.password.reset"
    
    # User management actions
    USER_CREATE = "user.create"
    USER_UPDATE = "user.update"
    USER_DELETE = "user.delete"
    USER_ROLE_CHANGE = "user.role.change"
    USER_ACTIVATE = "user.activate"
    USER_DEACTIVATE = "user.deactivate"
    
    # Job management actions
    JOB_CREATE = "job.create"
    JOB_UPDATE = "job.update"
    JOB_DELETE = "job.delete"
    JOB_APPROVE = "job.approve"
    JOB_REJECT = "job.reject"
    JOB_CANCEL = "job.cancel"
    JOB_STATUS_CHANGE = "job.status.change"
    
    # File operations
    FILE_UPLOAD = "file.upload"
    FILE_DOWNLOAD = "file.download"
    FILE_DELETE = "file.delete"
    FILE_ACCESS = "file.access"
    
    # VTT editing actions
    VTT_EDIT = "vtt.edit"
    VTT_APPROVE = "vtt.approve"
    VTT_REJECT = "vtt.reject"
    
    # Admin actions
    ADMIN_CONFIG_CHANGE = "admin.config.change"
    ADMIN_SYSTEM_ACTION = "admin.system.action"
    ADMIN_DATA_EXPORT = "admin.data.export"
    ADMIN_AUDIT_ACCESS = "admin.audit.access"
    
    # Security events
    RATE_LIMIT_EXCEEDED = "security.rate_limit.exceeded"
    VALIDATION_FAILURE = "security.validation.failure"
    UNAUTHORIZED_ACCESS = "security.unauthorized.access"
    SUSPICIOUS_ACTIVITY = "security.suspicious.activity"


class AuditLogSeverity(str, Enum):
    """Severity levels for audit events."""
    
    INFO = "info"           # Normal operations
    WARNING = "warning"     # Suspicious but not critical
    ERROR = "error"         # Failed operations
    CRITICAL = "critical"   # Security incidents


class AuditLog(BaseModel):
    """Audit log entry model."""
    
    id: Optional[PyObjectId] = Field(default_factory=PyObjectId, alias="_id")
    
    # Core audit fields
    timestamp: datetime = Field(default_factory=datetime.utcnow)
    action: AuditAction
    severity: AuditLogSeverity = AuditLogSeverity.INFO
    
    # Actor information
    user_id: Optional[PyObjectId] = None
    user_email: Optional[str] = None
    user_role: Optional[str] = None
    
    # Request context
    ip_address: Optional[str] = None
    user_agent: Optional[str] = None
    request_id: Optional[str] = None
    session_id: Optional[str] = None
    
    # Resource information
    resource_type: Optional[str] = None  # e.g., "job", "user", "file"
    resource_id: Optional[str] = None
    resource_name: Optional[str] = None
    
    # Action details
    description: str
    details: Dict[str, Any] = Field(default_factory=dict)
    
    # Outcome
    success: bool = True
    error_message: Optional[str] = None
    
    # Additional metadata
    environment: str = "prod"
    service_name: str = "accessible-video-api"
    api_version: str = "v1"
    
    class Config:
        populate_by_name = True
        arbitrary_types_allowed = True
        json_encoders = {ObjectId: str}


class AuditLogCreate(BaseModel):
    """Schema for creating audit log entries."""
    
    action: AuditAction
    severity: AuditLogSeverity = AuditLogSeverity.INFO
    description: str
    
    # Optional fields that can be provided
    user_id: Optional[PyObjectId] = None
    user_email: Optional[str] = None
    user_role: Optional[str] = None
    ip_address: Optional[str] = None
    user_agent: Optional[str] = None
    request_id: Optional[str] = None
    resource_type: Optional[str] = None
    resource_id: Optional[str] = None
    resource_name: Optional[str] = None
    details: Dict[str, Any] = Field(default_factory=dict)
    success: bool = True
    error_message: Optional[str] = None


class AuditLogQuery(BaseModel):
    """Schema for querying audit logs."""
    
    # Time range
    start_date: Optional[datetime] = None
    end_date: Optional[datetime] = None
    
    # Filters
    action: Optional[AuditAction] = None
    severity: Optional[AuditLogSeverity] = None
    user_id: Optional[PyObjectId] = None
    user_email: Optional[str] = None
    resource_type: Optional[str] = None
    resource_id: Optional[str] = None
    success: Optional[bool] = None
    
    # Search
    search: Optional[str] = None  # Full-text search in description and details
    
    # Pagination
    skip: int = 0
    limit: int = 100
    
    # Sorting
    sort_by: str = "timestamp"
    sort_order: int = -1  # -1 for descending, 1 for ascending


class AuditLogResponse(BaseModel):
    """Response schema for audit log queries."""
    
    logs: list[AuditLog]
    total_count: int
    page: int
    page_size: int
    has_more: bool