"""
Customers Router
API endpoints for customer management
Adapted from OmniSync for BMC Hub
"""

from fastapi import APIRouter, HTTPException, Query
from typing import List, Optional, Dict
from pydantic import BaseModel
import logging

from app.core.database import execute_query, execute_insert, execute_update
from app.services.cvr_service import get_cvr_service

logger = logging.getLogger(__name__)

router = APIRouter()


# Pydantic Models
class CustomerBase(BaseModel):
    name: str
    cvr_number: Optional[str] = None
    email: Optional[str] = None
    phone: Optional[str] = None
    address: Optional[str] = None
    city: Optional[str] = None
    postal_code: Optional[str] = None
    country: Optional[str] = "DK"
    website: Optional[str] = None
    is_active: Optional[bool] = True
    invoice_email: Optional[str] = None
    mobile_phone: Optional[str] = None


class CustomerCreate(CustomerBase):
    pass


class CustomerUpdate(BaseModel):
    name: Optional[str] = None
    cvr_number: Optional[str] = None
    email: Optional[str] = None
    phone: Optional[str] = None
    address: Optional[str] = None
    city: Optional[str] = None
    postal_code: Optional[str] = None
    country: Optional[str] = None
    website: Optional[str] = None
    is_active: Optional[bool] = None
    invoice_email: Optional[str] = None
    mobile_phone: Optional[str] = None


class ContactCreate(BaseModel):
    first_name: str
    last_name: str
    email: Optional[str] = None
    phone: Optional[str] = None
    mobile: Optional[str] = None
    title: Optional[str] = None
    department: Optional[str] = None
    is_primary: Optional[bool] = False
    role: Optional[str] = None


@router.get("/customers")
async def list_customers(
    limit: int = Query(default=50, ge=1, le=1000),
    offset: int = Query(default=0, ge=0),
    search: Optional[str] = Query(default=None),
    source: Optional[str] = Query(default=None),  # 'vtiger', 'local', or None
    is_active: Optional[bool] = Query(default=None)
):
    """
    List customers with pagination and filtering
    
    Args:
        limit: Maximum number of customers to return
        offset: Number of customers to skip
        search: Search term for name, email, cvr, phone, city
        source: Filter by source ('vtiger' or 'local')
        is_active: Filter by active status
    """
    # Build query
    query = """
        SELECT 
            c.*,
            COUNT(DISTINCT cc.contact_id) as contact_count
        FROM customers c
        LEFT JOIN contact_companies cc ON cc.customer_id = c.id
        WHERE 1=1
    """
    params = []
    
    # Add search filter
    if search:
        query += """ AND (
            c.name ILIKE %s OR
            c.email ILIKE %s OR
            c.cvr_number ILIKE %s OR
            c.phone ILIKE %s OR
            c.city ILIKE %s
        )"""
        search_term = f"%{search}%"
        params.extend([search_term] * 5)
    
    # Add source filter
    if source == 'vtiger':
        query += " AND c.vtiger_id IS NOT NULL"
    elif source == 'local':
        query += " AND c.vtiger_id IS NULL"
    
    # Add active filter
    if is_active is not None:
        query += " AND c.is_active = %s"
        params.append(is_active)
    
    query += """ 
        GROUP BY c.id
        ORDER BY c.name 
        LIMIT %s OFFSET %s
    """
    params.extend([limit, offset])
    
    rows = execute_query(query, tuple(params))
    
    # Get total count
    count_query = "SELECT COUNT(*) as total FROM customers WHERE 1=1"
    count_params = []
    
    if search:
        count_query += """ AND (
            name ILIKE %s OR
            email ILIKE %s OR
            cvr_number ILIKE %s OR
            phone ILIKE %s OR
            city ILIKE %s
        )"""
        count_params.extend([search_term] * 5)
    
    if source == 'vtiger':
        count_query += " AND vtiger_id IS NOT NULL"
    elif source == 'local':
        count_query += " AND vtiger_id IS NULL"
    
    if is_active is not None:
        count_query += " AND is_active = %s"
        count_params.append(is_active)
    
    count_result = execute_query(count_query, tuple(count_params), fetchone=True)
    total = count_result['total'] if count_result else 0
    
    return {
        "customers": rows or [],
        "total": total,
        "limit": limit,
        "offset": offset
    }


@router.get("/customers/{customer_id}")
async def get_customer(customer_id: int):
    """Get single customer by ID with contact count"""
    # Get customer
    customer = execute_query(
        "SELECT * FROM customers WHERE id = %s",
        (customer_id,),
        fetchone=True
    )
    
    if not customer:
        raise HTTPException(status_code=404, detail="Customer not found")
    
    # Get contact count
    contact_count_result = execute_query(
        "SELECT COUNT(*) as count FROM contact_companies WHERE customer_id = %s",
        (customer_id,),
        fetchone=True
    )
    
    contact_count = contact_count_result['count'] if contact_count_result else 0
    
    return {
        **customer,
        'contact_count': contact_count
    }


@router.post("/customers")
async def create_customer(customer: CustomerCreate):
    """Create a new customer"""
    try:
        customer_id = execute_insert(
            """INSERT INTO customers 
               (name, cvr_number, email, phone, address, city, postal_code, 
                country, website, is_active, invoice_email, mobile_phone)
               VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
               RETURNING id""",
            (
                customer.name,
                customer.cvr_number,
                customer.email,
                customer.phone,
                customer.address,
                customer.city,
                customer.postal_code,
                customer.country,
                customer.website,
                customer.is_active,
                customer.invoice_email,
                customer.mobile_phone
            )
        )
        
        logger.info(f"✅ Created customer {customer_id}: {customer.name}")
        
        # Fetch and return created customer
        created = execute_query(
            "SELECT * FROM customers WHERE id = %s",
            (customer_id,),
            fetchone=True
        )
        return created
        
    except Exception as e:
        logger.error(f"❌ Failed to create customer: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.put("/customers/{customer_id}")
async def update_customer(customer_id: int, update: CustomerUpdate):
    """Update customer information"""
    # Verify customer exists
    existing = execute_query(
        "SELECT id FROM customers WHERE id = %s",
        (customer_id,),
        fetchone=True
    )
    if not existing:
        raise HTTPException(status_code=404, detail="Customer not found")
    
    # Build dynamic UPDATE query
    updates = []
    params = []
    
    update_dict = update.dict(exclude_unset=True)
    for field, value in update_dict.items():
        updates.append(f"{field} = %s")
        params.append(value)
    
    if not updates:
        raise HTTPException(status_code=400, detail="No fields to update")
    
    params.append(customer_id)
    
    query = f"UPDATE customers SET {', '.join(updates)}, updated_at = CURRENT_TIMESTAMP WHERE id = %s"
    
    try:
        execute_update(query, tuple(params))
        logger.info(f"✅ Updated customer {customer_id}")
        
        # Fetch and return updated customer
        updated = execute_query(
            "SELECT * FROM customers WHERE id = %s",
            (customer_id,),
            fetchone=True
        )
        return updated
        
    except Exception as e:
        logger.error(f"❌ Failed to update customer {customer_id}: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/customers/{customer_id}/contacts")
async def get_customer_contacts(customer_id: int):
    """Get all contacts for a specific customer"""
    rows = execute_query("""
        SELECT 
            c.*,
            cc.is_primary,
            cc.role,
            cc.notes
        FROM contacts c
        JOIN contact_companies cc ON c.id = cc.contact_id
        WHERE cc.customer_id = %s AND c.is_active = TRUE
        ORDER BY cc.is_primary DESC, c.first_name, c.last_name
    """, (customer_id,))
    
    return rows or []


@router.post("/customers/{customer_id}/contacts")
async def create_customer_contact(customer_id: int, contact: ContactCreate):
    """Create a new contact for a customer"""
    # Verify customer exists
    customer = execute_query(
        "SELECT id FROM customers WHERE id = %s",
        (customer_id,),
        fetchone=True
    )
    if not customer:
        raise HTTPException(status_code=404, detail="Customer not found")
    
    try:
        # Create contact
        contact_id = execute_insert(
            """INSERT INTO contacts 
               (first_name, last_name, email, phone, mobile, title, department)
               VALUES (%s, %s, %s, %s, %s, %s, %s)
               RETURNING id""",
            (
                contact.first_name,
                contact.last_name,
                contact.email,
                contact.phone,
                contact.mobile,
                contact.title,
                contact.department
            )
        )
        
        # Link contact to customer
        execute_insert(
            """INSERT INTO contact_companies 
               (contact_id, customer_id, is_primary, role)
               VALUES (%s, %s, %s, %s)""",
            (contact_id, customer_id, contact.is_primary, contact.role)
        )
        
        logger.info(f"✅ Created contact {contact_id} for customer {customer_id}")
        
        # Fetch and return created contact
        created = execute_query(
            "SELECT * FROM contacts WHERE id = %s",
            (contact_id,),
            fetchone=True
        )
        return created
        
    except Exception as e:
        logger.error(f"❌ Failed to create contact: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/cvr/{cvr_number}")
async def lookup_cvr(cvr_number: str):
    """Lookup company information by CVR number"""
    cvr_service = get_cvr_service()
    
    result = await cvr_service.lookup_by_cvr(cvr_number)
    
    if not result:
        raise HTTPException(status_code=404, detail="CVR number not found")
    
    return result