"""
Search blueprint for Plutus payment processing application.

Provides unified search functionality across SinglePayments and Payments tables.
Supports search by Splynx_ID and Payment Intent.
"""

from flask import Blueprint, render_template, request, jsonify
from flask_login import login_required
from sqlalchemy import or_, and_
from models import SinglePayments, Payments, Users
from app import db
from permissions import helpdesk_required
import re

search_bp = Blueprint('search', __name__, url_prefix='/search')

@search_bp.route('/')
@helpdesk_required
def search_page():
    """Display the unified payment search page."""
    return render_template('search/search.html')

@search_bp.route('/api', methods=['GET'])
@helpdesk_required
def search_payments():
    """
    API endpoint for searching payments.
    
    Query parameters:
    - q: Search query (Splynx_ID or Payment Intent)
    - type: Search type ('all', 'splynx_id', 'payment_intent')
    - limit: Maximum results to return (default: 50)
    """
    try:
        query = request.args.get('q', '').strip()
        search_type = request.args.get('type', 'all')
        limit = min(int(request.args.get('limit', 50)), 100)  # Max 100 results
        
        if not query:
            return jsonify({
                'success': False,
                'error': 'Search query is required',
                'results': []
            })
        
        # Determine search strategy based on query content
        if search_type == 'all':
            search_type = detect_search_type(query)
        
        # Build search queries for both tables
        single_payments_query = build_single_payments_query(query, search_type, limit)
        payments_query = build_payments_query(query, search_type, limit)
        
        # Execute searches
        single_payments_results = single_payments_query.all()
        payments_results = payments_query.all()
        
        # Format results
        formatted_results = []
        
        # Add single payments results
        for payment in single_payments_results:
            formatted_results.append(format_single_payment_result(payment))
        
        # Add batch payments results
        for payment in payments_results:
            formatted_results.append(format_batch_payment_result(payment))
        
        # Sort by creation date (newest first)
        formatted_results.sort(key=lambda x: x['created'], reverse=True)
        
        # Apply limit to combined results
        formatted_results = formatted_results[:limit]
        
        return jsonify({
            'success': True,
            'results': formatted_results,
            'total_found': len(formatted_results),
            'search_query': query,
            'search_type': search_type
        })
        
    except Exception as e:
        return jsonify({
            'success': False,
            'error': str(e),
            'results': []
        }), 500

def detect_search_type(query: str) -> str:
    """
    Detect the type of search based on query content.
    
    Args:
        query: Search query string
    
    Returns:
        str: 'payment_intent' if looks like PI, 'splynx_id' if numeric, 'all' otherwise
    """
    # Check if it looks like a payment intent ID
    if re.match(r'^pi_[a-zA-Z0-9]+$', query):
        return 'payment_intent'
    
    # Check if it's purely numeric (likely Splynx ID)
    if query.isdigit():
        return 'splynx_id'
    
    # Default to searching all fields
    return 'all'

def build_single_payments_query(query: str, search_type: str, limit: int):
    """Build SQLAlchemy query for SinglePayments table."""
    base_query = db.session.query(SinglePayments, Users.FullName).outerjoin(
        Users, SinglePayments.Who == Users.id
    )
    
    if search_type == 'splynx_id':
        try:
            splynx_id = int(query)
            return base_query.filter(SinglePayments.Splynx_ID == splynx_id).limit(limit)
        except ValueError:
            return base_query.filter(False)  # No results for invalid numeric
    
    elif search_type == 'payment_intent':
        return base_query.filter(SinglePayments.Payment_Intent == query).limit(limit)
    
    else:  # search_type == 'all'
        # Try to convert to int for Splynx_ID search
        conditions = []
        
        if query.isdigit():
            conditions.append(SinglePayments.Splynx_ID == int(query))
        
        conditions.extend([
            SinglePayments.Payment_Intent == query,
            SinglePayments.Stripe_Customer_ID.like(f'%{query}%')
        ])
        
        return base_query.filter(or_(*conditions)).limit(limit)

def build_payments_query(query: str, search_type: str, limit: int):
    """Build SQLAlchemy query for Payments table."""
    base_query = db.session.query(Payments)
    
    if search_type == 'splynx_id':
        try:
            splynx_id = int(query)
            return base_query.filter(Payments.Splynx_ID == splynx_id).limit(limit)
        except ValueError:
            return base_query.filter(False)  # No results for invalid numeric
    
    elif search_type == 'payment_intent':
        return base_query.filter(Payments.Payment_Intent == query).limit(limit)
    
    else:  # search_type == 'all'
        conditions = []
        
        if query.isdigit():
            conditions.append(Payments.Splynx_ID == int(query))
        
        conditions.extend([
            Payments.Payment_Intent == query,
            Payments.Stripe_Customer_ID.like(f'%{query}%')
        ])
        
        return base_query.filter(or_(*conditions)).limit(limit)

def format_single_payment_result(payment_data) -> dict:
    """Format a SinglePayment result for API response."""
    payment, user_name = payment_data
    
    return {
        'id': payment.id,
        'type': 'single',
        'splynx_id': payment.Splynx_ID,
        'stripe_customer_id': payment.Stripe_Customer_ID,
        'payment_intent': payment.Payment_Intent,
        'payment_method': payment.Payment_Method,
        'amount': payment.Payment_Amount,
        'success': payment.Success,
        'error': payment.Error,
        'refund': payment.Refund,
        'refund_followup': payment.Refund_FollowUp,
        'pi_followup': payment.PI_FollowUp,
        'created': payment.Created.isoformat(),
        'processed_by': user_name or 'Unknown',
        'detail_url': f'/single-payment/detail/{payment.id}',
        'splynx_url': f'https://billing.interphone.com.au/admin/customers/view?id={payment.Splynx_ID}' if payment.Splynx_ID else None
    }

def format_batch_payment_result(payment) -> dict:
    """Format a batch Payment result for API response."""
    return {
        'id': payment.id,
        'type': 'batch',
        'batch_id': payment.PaymentBatch_ID,
        'splynx_id': payment.Splynx_ID,
        'stripe_customer_id': payment.Stripe_Customer_ID,
        'payment_intent': payment.Payment_Intent,
        'payment_method': payment.Payment_Method,
        'amount': payment.Payment_Amount,
        'success': payment.Success,
        'error': payment.Error,
        'refund': payment.Refund,
        'refund_followup': payment.Refund_FollowUp,
        'pi_followup': payment.PI_FollowUp,
        'created': payment.Created.isoformat(),
        'processed_by': 'Batch Process',
        'detail_url': f'/payment/detail/{payment.id}',
        'batch_url': f'/batch/{payment.PaymentBatch_ID}',
        'splynx_url': f'https://billing.interphone.com.au/admin/customers/view?id={payment.Splynx_ID}' if payment.Splynx_ID else None
    }