#!/usr/bin/env python3
"""
Enhance Procurement Data for AI Insights
Adds purchase order items with price trends to enable procurement insights
"""

import json
import random
from pathlib import Path

# Set seed for reproducibility
random.seed(42)

# Price trend data (realistic price movements over 90 days)
INGREDIENTS_WITH_TRENDS = [
    {
        "id": "10000000-0000-0000-0000-000000000001",
        "name": "Harina de Trigo T55",
        "base_price": 0.85,
        "trend": 0.08,  # 8% increase over 90 days
        "variability": 0.02,
        "unit": "kg"
    },
    {
        "id": "10000000-0000-0000-0000-000000000002",
        "name": "Harina de Trigo T65",
        "base_price": 0.95,
        "trend": 0.06,  # 6% increase
        "variability": 0.02,
        "unit": "kg"
    },
    {
        "id": "10000000-0000-0000-0000-000000000011",
        "name": "Mantequilla sin Sal",
        "base_price": 6.50,
        "trend": 0.12,  # 12% increase (highest)
        "variability": 0.05,
        "unit": "kg"
    },
    {
        "id": "10000000-0000-0000-0000-000000000012",
        "name": "Leche Entera Fresca",
        "base_price": 0.95,
        "trend": -0.03,  # 3% decrease (seasonal surplus)
        "variability": 0.02,
        "unit": "L"
    },
    {
        "id": "10000000-0000-0000-0000-000000000021",
        "name": "Levadura Fresca",
        "base_price": 4.20,
        "trend": 0.04,  # 4% increase
        "variability": 0.03,
        "unit": "kg"
    },
    {
        "id": "10000000-0000-0000-0000-000000000032",
        "name": "Azúcar Blanco",
        "base_price": 1.10,
        "trend": 0.02,  # 2% increase (stable)
        "variability": 0.01,
        "unit": "kg"
    },
]


def calculate_price(ingredient, days_ago):
    """
    Calculate price based on linear trend + random variability

    Args:
        ingredient: Dict with base_price, trend, variability
        days_ago: Number of days in the past

    Returns:
        Price at that point in time
    """
    # Apply trend proportionally based on how far back in time
    # If trend is 8% over 90 days, price 45 days ago had 4% increase from base
    trend_factor = 1 + (ingredient["trend"] * (90 - days_ago) / 90)

    # Add random variability
    variability = random.uniform(-ingredient["variability"], ingredient["variability"])

    price = ingredient["base_price"] * trend_factor * (1 + variability)
    return round(price, 2)


def parse_days_ago(order_date_str):
    """Parse order_date to extract days ago"""
    if 'BASE_TS' in order_date_str:
        if '- ' in order_date_str:
            # Extract number from "BASE_TS - 1d" or "BASE_TS - 1h"
            parts = order_date_str.split('- ')[1]
            if 'd' in parts:
                try:
                    return int(parts.split('d')[0])
                except:
                    pass
            elif 'h' in parts:
                # Hours - treat as 0 days
                return 0
        elif '+ ' in order_date_str:
            # Future date - treat as 0 days ago (current price)
            return 0
    return 30  # Default fallback


def add_items_to_pos():
    """Add items arrays to purchase orders with realistic price trends"""

    fixture_path = Path(__file__).parent / "07-procurement.json"

    print("🔧 Enhancing Procurement Data for AI Insights...")
    print()

    # Load existing data
    with open(fixture_path, 'r', encoding='utf-8') as f:
        data = json.load(f)

    pos = data.get('purchase_orders', [])
    print(f"📦 Found {len(pos)} purchase orders")
    print()

    items_added = 0

    for i, po in enumerate(pos):
        # Parse order date to get days ago
        order_date_str = po.get('order_date', 'BASE_TS - 1d')
        days_ago = parse_days_ago(order_date_str)

        # Select 2-4 random ingredients for this PO
        num_items = random.randint(2, 4)
        selected_ingredients = random.sample(INGREDIENTS_WITH_TRENDS, k=num_items)

        items = []
        po_subtotal = 0.0

        for ingredient in selected_ingredients:
            # Calculate price at this point in time
            unit_price = calculate_price(ingredient, days_ago)

            # Order quantity (realistic for ingredient type)
            if ingredient["unit"] == "kg":
                quantity = random.randint(100, 500)
            else:  # Liters
                quantity = random.randint(50, 200)

            total_price = round(quantity * unit_price, 2)
            po_subtotal += total_price

            items.append({
                "ingredient_id": ingredient["id"],
                "ingredient_name": ingredient["name"],
                "ordered_quantity": float(quantity),
                "unit": ingredient["unit"],
                "unit_price": unit_price,
                "total_price": total_price,
                "received_quantity": None,
                "status": "pending" if po.get('status') != 'delivered' else "received"
            })

        # Add items to PO
        po['items'] = items

        # Update PO totals to match items
        po['subtotal'] = round(po_subtotal, 2)
        tax_rate = 0.21  # 21% IVA in Spain
        po['tax_amount'] = round(po_subtotal * tax_rate, 2)
        po['shipping_cost'] = 15.0 if po_subtotal < 500 else 20.0
        po['total_amount'] = round(po['subtotal'] + po['tax_amount'] + po['shipping_cost'], 2)

        items_added += len(items)

        print(f"  ✓ PO-{i+1} ({order_date_str}): {len(items)} items, €{po['total_amount']:.2f} total")

    # Save back
    with open(fixture_path, 'w', encoding='utf-8') as f:
        json.dump(data, f, indent=2, ensure_ascii=False)

    print()
    print("=" * 60)
    print("✅ PROCUREMENT DATA ENHANCEMENT COMPLETE")
    print("=" * 60)
    print()
    print(f"📊 SUMMARY:")
    print(f"   • Purchase orders enhanced: {len(pos)}")
    print(f"   • Total items added: {items_added}")
    print(f"   • Average items per PO: {items_added / len(pos):.1f}")
    print()
    print("🎯 PRICE TRENDS ADDED:")
    for ing in INGREDIENTS_WITH_TRENDS:
        direction = "↑" if ing["trend"] > 0 else "↓"
        print(f"   {direction} {ing['name']}: {ing['trend']*100:+.1f}% over 90 days")
    print()
    print("🚀 PROCUREMENT INSIGHTS READY:")
    print("   ✓ Price Forecaster: Can detect trends & recommend actions")
    print("   ✓ Supplier Performance: Can analyze delivery reliability")
    print("   ✓ Cost Optimizer: Can identify bulk buying opportunities")
    print()
    print("Next steps:")
    print("   1. Create new demo session")
    print("   2. Wait 60 seconds for AI models")
    print("   3. Check for procurement insights (expect 1-2)")
    print()


if __name__ == "__main__":
    add_items_to_pos()