# ================================================================
# services/orders/app/models/alerts.py
# ================================================================
"""
Alert system database models for Orders Service
"""

import uuid
from datetime import datetime
from decimal import Decimal
from typing import Optional
from sqlalchemy import Column, String, Boolean, DateTime, Numeric, Text, Integer
from sqlalchemy.dialects.postgresql import UUID, JSONB
from sqlalchemy.sql import func

from app.core.database import Base


class OrderAlert(Base):
    """Alert system for orders and procurement issues"""
    __tablename__ = "order_alerts"
    
    # Primary identification
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    tenant_id = Column(UUID(as_uuid=True), nullable=False, index=True)
    alert_code = Column(String(50), nullable=False, index=True)
    
    # Alert categorization
    alert_type = Column(String(50), nullable=False, index=True)
    # Alert types: order_issue, procurement_shortage, payment_problem, delivery_delay, 
    # quality_concern, high_value_order, rush_order, customer_issue, supplier_problem
    
    severity = Column(String(20), nullable=False, default="medium", index=True)
    # Severity levels: critical, high, medium, low
    
    category = Column(String(50), nullable=False, index=True)
    # Categories: operational, financial, quality, customer, supplier, compliance
    
    # Alert source and context
    source_entity_type = Column(String(50), nullable=False)  # order, customer, procurement_plan, etc.
    source_entity_id = Column(UUID(as_uuid=True), nullable=False, index=True)
    source_entity_reference = Column(String(100), nullable=True)  # Human-readable reference
    
    # Alert content
    title = Column(String(200), nullable=False)
    description = Column(Text, nullable=False)
    detailed_message = Column(Text, nullable=True)
    
    # Alert conditions and triggers
    trigger_condition = Column(String(200), nullable=True)
    threshold_value = Column(Numeric(15, 4), nullable=True)
    actual_value = Column(Numeric(15, 4), nullable=True)
    variance = Column(Numeric(15, 4), nullable=True)
    
    # Context data
    alert_data = Column(JSONB, nullable=True)  # Additional context-specific data
    business_impact = Column(Text, nullable=True)
    customer_impact = Column(Text, nullable=True)
    financial_impact = Column(Numeric(12, 2), nullable=True)
    
    # Alert status and lifecycle
    status = Column(String(50), nullable=False, default="active", index=True)
    # Status values: active, acknowledged, in_progress, resolved, dismissed, expired
    
    alert_state = Column(String(50), nullable=False, default="new")  # new, escalated, recurring
    
    # Resolution and follow-up
    resolution_action = Column(String(200), nullable=True)
    resolution_notes = Column(Text, nullable=True)
    resolution_cost = Column(Numeric(10, 2), nullable=True)
    
    # Timing and escalation
    first_occurred_at = Column(DateTime(timezone=True), nullable=False, index=True)
    last_occurred_at = Column(DateTime(timezone=True), nullable=False)
    acknowledged_at = Column(DateTime(timezone=True), nullable=True)
    resolved_at = Column(DateTime(timezone=True), nullable=True)
    expires_at = Column(DateTime(timezone=True), nullable=True)
    
    # Occurrence tracking
    occurrence_count = Column(Integer, nullable=False, default=1)
    is_recurring = Column(Boolean, nullable=False, default=False)
    recurrence_pattern = Column(String(100), nullable=True)
    
    # Responsibility and assignment
    assigned_to = Column(UUID(as_uuid=True), nullable=True)
    assigned_role = Column(String(50), nullable=True)  # orders_manager, procurement_manager, etc.
    escalated_to = Column(UUID(as_uuid=True), nullable=True)
    escalation_level = Column(Integer, nullable=False, default=0)
    
    # Notification tracking
    notification_sent = Column(Boolean, nullable=False, default=False)
    notification_methods = Column(JSONB, nullable=True)  # [email, sms, whatsapp, dashboard]
    notification_recipients = Column(JSONB, nullable=True)  # List of recipients
    last_notification_sent = Column(DateTime(timezone=True), nullable=True)
    
    # Customer communication
    customer_notified = Column(Boolean, nullable=False, default=False)
    customer_notification_method = Column(String(50), nullable=True)
    customer_message = Column(Text, nullable=True)
    
    # Recommended actions
    recommended_actions = Column(JSONB, nullable=True)  # List of suggested actions
    automated_actions_taken = Column(JSONB, nullable=True)  # Actions performed automatically
    manual_actions_required = Column(JSONB, nullable=True)  # Actions requiring human intervention
    
    # Priority and urgency
    priority_score = Column(Integer, nullable=False, default=50)  # 1-100 scale
    urgency = Column(String(20), nullable=False, default="normal")  # immediate, urgent, normal, low
    business_priority = Column(String(20), nullable=False, default="normal")
    
    # Related entities
    related_orders = Column(JSONB, nullable=True)  # Related order IDs
    related_customers = Column(JSONB, nullable=True)  # Related customer IDs
    related_suppliers = Column(JSONB, nullable=True)  # Related supplier IDs
    related_alerts = Column(JSONB, nullable=True)  # Related alert IDs
    
    # Performance tracking
    detection_time = Column(DateTime(timezone=True), nullable=True)  # When issue was detected
    response_time_minutes = Column(Integer, nullable=True)  # Time to acknowledge
    resolution_time_minutes = Column(Integer, nullable=True)  # Time to resolve
    
    # Quality and feedback
    alert_accuracy = Column(Boolean, nullable=True)  # Was this a valid alert?
    false_positive = Column(Boolean, nullable=False, default=False)
    feedback_notes = Column(Text, nullable=True)
    
    # Compliance and audit
    compliance_related = Column(Boolean, nullable=False, default=False)
    audit_trail = Column(JSONB, nullable=True)  # Changes and actions taken
    regulatory_impact = Column(String(200), nullable=True)
    
    # Integration and external systems
    external_system_reference = Column(String(100), nullable=True)
    external_ticket_number = Column(String(50), nullable=True)
    erp_reference = Column(String(100), nullable=True)
    
    # Audit fields
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False)
    created_by = Column(UUID(as_uuid=True), nullable=True)
    updated_by = Column(UUID(as_uuid=True), nullable=True)
    
    # Additional metadata
    alert_metadata = Column(JSONB, nullable=True)